Dissertations / Theses: 'Axial flux motor'

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Shiwakoti, Rochak. "Design and Analysis of Modular Axial Flux Switched Reluctance Motor." ScholarWorks@UNO, 2019. https://scholarworks.uno.edu/td/2680.

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This thesis presents a new modular structure of the axial flux Switched Reluctance Motor (SRM). The design consists of four stator disks with each adjacent disk rotated 30 degrees apart and four rotor disks connected to a common shaft. The proposed design aims to reduce the unwanted radial force, mitigate the torque ripple, and improve the efficiency. The modular structure distributes the radial force and torque strokes along the axial length of the motor, potentially damping the torque pulsation. In addition, the modular structure would deliver the rating power at a lower current level, reducing the overall ohmic loss. Moreover, if a fault occurs on a motor disk or its control unit, the motor would still operate through other disks, increasing the reliability of the system. To verify the effectiveness of the proposed design, the magneto-static and transient performance of the motor are compared with the conventional single layer structure using 3-D Finite-Element (FE) software tool to see that the proposed motor performs better with lower torque ripple and lower radial force than a conventional single layer structure.

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Yilmaz, Kurtulus. "Comparison Of Axial Flux And Radial Flux Brushless Dc Motor Topologies For Control Moment Gyroscope Wheel Applications." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/12610565/index.pdf.

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In this thesis axial flux and radial flux brushless dc motors will be studied as a drive motor for the control of moment gyroscope wheel. Design equations for axial flux and radial flux brushless dc motor topologies will be reviewed. Based on these equations radial and axial flux motors with different number of poles will be designed that meet control moment gyroscope wheel application requirements. The results will be evaluated in terms of efficiency, torque/mass and torque/volume, and suitability for the control moment gyroscope application.

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Buøy, John Ola. "Development of high efficiency Axial Flux Motor for Shell Eco-marathon." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for elkraftteknikk, 2013. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-23648.

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In 2011 Lubna Nasrin designed an optimized in-wheel axial flux motor for the competition Shell Eco-Marathon. A motor was built for the 2012 competition by Fredrik V. Endresen. Testing of this motor showed however that the performance was nothing like the one anticipated by Nasrin?s. The conclusion was that the production methods were not good enough and this was the main reason for the poor result.A new motor was built for use in the 2013 competition. Several design improvements over the old motor which was built in 2010 has been made. Litz wire is used in the stator and Halbach array permanent arrangement in the rotors. Rims, axle and other mechanical parts have also been made brand new this year to try to make the best possible design.The assembly didn?t go without problems, but in the end the motor was fit to the car and tested. It was used in the competition where the team ended up with a third place in the battery electric class.Several tests were performed on the motor to identify how well it performed compared to the FEM results. Question marks have however been raised when it comes to the results of the test due to problems aligning the motor in the test bench. The results indicate rather high rotational losses, but also an induced voltage 35% lower than anticipated. This should not be critical though as the theoretical efficiency, rotational losses discarded, still is 99% with this value.The high eddy current and friction losses measured do however ruin the real efficiency of the machine.

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Mularcik, Bradley S. "Virtual Moving Air Gap for the Speed Range Improvement of a Dual Stator Axial Flux Motor." University of Akron / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=akron1340404856.

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Lacina, David. "Malý axiální motor pro čerpadlo." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2017. http://www.nusl.cz/ntk/nusl-318186.

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This thesis aims to design a motor with axial magnetic flux, which could be used as a direct propeller of heart replacement pump. It is divided into several parts, first of which deals with describing possible axial motors construction design. Next follows up the description of possible motor designs, from which the non-ferrous one was chosen. After that, an analytic calculation of motor’s properties is conducted. Calculated parameters are thereafter verified by software tools using finite element method. Finally, the whole motor was manufactured and had its parameters tested and verified.

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Thelin, Peter. "Design and Evaluation of a Compact 15 kW PM Integral Motor." Doctoral thesis, KTH, Electrical Systems, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3322.

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This thesis deals with the integral motor of tomorrow, and particularly with a variable speed, sensorless permanent magnet synchronous motor with an integrated converter. The rated power is 15 kW at 1500 r/min. The outer dimensions are approximately the same as for the equivalent standard induction motor.Control strategies for pumps and fans, i.e. suitable loads for variable speed motors, are briefly described. The huge energy savings that can be made by reducing the speed instead of throttling/choking the flow are pointed out. Compared to installing an induction motor with a separate converter, a PM integral motor will probably pay-off in less than a year.A totally analytical expression for calculating the airgap flux density of permanent magnet motors with buried magnets is derived. The analytical expression includes axial leakage, and iron saturation of the most narrow part of the magnetic circuit of the machine.A computer program for optimization of PM motors with buried magnets has been developed. It was used to design the manufactured prototype PM integral motor, and the parameters are investigated with analytical and/or FEM calculations. The optimization program is also used to suggest nearoptimum pole numbers for desired powers (4-37 kW) and speeds (750- 3000 r/min) of inverter-fed PM motors. Results show that compact buried PM motors should have relatively large airgaps and high NdFeB-magnet masses to improve the efficiency. Ferrite magnets are unsuitable.Measurements on the manufactured PM motor, the novel concept of stator integrated filter coils, and the complete PM integral motor are presented. Special attention was given to temperature and overall efficiency measurements.The rotor cage losses were investigated by time-stepping FEM. Four short circuit fault conditions were also examined in order to evaluate the risks of demagnetization of the buried magnets.

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Huzlík, Rostislav. "Motor-generátor pro vírovou turbínu." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2015. http://www.nusl.cz/ntk/nusl-233693.

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The aim of this doctoral thesis is to design a motor-generator for swirl turbine. Swirl turbine is a relatively new type of turbine developed at the Department of Fluid Engineering Viktor Kaplan Energy Institute FME BUT. Swirl turbine is designed for use on small head, where the classical types of turbines either poor efficacy or are economically disadvantaged. As suitable construction for the motor-generator was selected synchronous machine with permanent magnets and with axial magnetic flow with coreless stator. As part of the work is carried out calculating the properties of turbines for defined operating point simulation model of the turbine. After already made draft motor-generator to optimally meet the characteristics of the turbine. The complete design of the motor-generator is validated by calculating the finite element method models. Designed machine must be able to work as a generator and as a motor, if it was necessary to use a turbine as a pump.

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Endresen, Fredrik Vihovde. "Electric Motor Development for Shell Eco-Marathon : Manufacturing an ironless axial flux permanent magnet Motor with Hallbach array and Development of existing Motor for the Shell Eco-Marathon Competition." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for elkraftteknikk, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-19021.

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This thesis describes the process of making a new engine for the car DNV Fuel Fighter 2 that participated in the Shell Eco-Marathon Europe 2012 in Rotterdam. The decision was made to construct a new engine based on an optimized design by Lubna Nasrin. The engine is an ironless axial flux permanent magnet machine with Hallbach array. As a contingency plan there was the possibility to modify the engine used in 2010 and 2011 built by André Dahl-Jacobsen. The result of the process is that the new engine is operational and it has displayed an efficiency of 68 %. However the old engine has displayed an efficiency of 86 %. Because of this, the car raced with the old engine and had an energy consumption of 163 km/kWh. It is still believed that the new engine can be a very successful engine given that it is modified. The new engine has room for improvement especially with regards to stator production and wiring connections. Suggestions are made for how to achieve a higher efficiency. This thesis describes some of the practical engineering challenges that arise when constructing a novel motor. The construction of the Hallbach array is well described here.This work has been a part of a larger project where the end goal was to participate in and win the Shell Eco Marathon Europe. This means that the engine must not only perform well on its own. The engine must also function well with the other components technically and it must be possible to make it with the time and resources available. The development of new technology is expensive and it has therefore been a priority to find funding for this project. This will also be described.

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Husain, Tausif. "DESIGN, ANALYSIS AND IMPLEMENTATION OF A NOVEL DOUBLE SIDED E-CORETRANSVERSE FLUX MACHINE WITH AXIAL AIRGAP." University of Akron / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=akron1500561964286682.

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Dumas, Florian. "Contribution à l'étude des machines polyentrefers à aimants permanents et à entrefer réduit.Applications aux machines à flux axial à hautes performances sous contrainte d'encombrement." Thesis, Montpellier 2, 2011. http://www.theses.fr/2011MON20151.

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Cette thèse porte sur l'étude de machines polyentrefers et leurs limitations, dans le contexte d'avion plus électrique et du projet de déplacement des avions au sol. Ces moteurs, basés sur l'utilisation de plusieurs éléments mobiles et fixes mis en parallèle, permettent d'obtenir de hautes performances. Une étude sur les tolérances des dimensions des éléments actifs montre que les performances peuvent être dégradées si des précautions lors de la réalisation ne sont pas prises et si les entrefers utilisés ne sont pas faibles. Ce manuscrit présente un système totalement innovant permettant d'utiliser un entrefer réduit à son minimum sans que les performances ne soient dégradées par de la friction. Ce système est appelé système de compensation des efforts de plaquage. Afin de développer un moteur tournant à entraînement direct dans le cadre du taxiage des avions, deux topologies différentes de machines discoïdes sont étudiées et dimensionnées. Les résultats favorisent l'utilisation d'une des deux structures, à entrefer réduit, pour réaliser un maximum de couple dans le volume donné. Afin de prouver la faisabilité du système innovant sur un moteur discoïde, la réalisation d'un prototype laboratoire complet est proposée. Des simulations thermiques et du comportement du système innovant permettront de valider ces études This thesis focuses on the study of multi-air gap machines and their limitations, in the framework of more electric aircraft and the project of moving aircrafts on the ground without the main engines. These motors, based on the use of mobile and fixed parts disposed in parallel, induce high performance. A study concerning the tolerance for the dimensions of active parts shows that performance can decrease if precautions are not taken during manufacturing and if the air gaps are not small. This manuscript presents a totally innovative system that permits the use of an air gap reduced to its minimum without reducing performance by friction. This system is called system of attraction control. In order to develop a direct-drive motor for aircraft taxiing, two different topologies of disc-type machines are studied and sized. The obtained results encourage the use of one of the two structures with reduced air gap to realize maximum torque in the fixed volume. To prove the feasibility of the innovative system on a disc-type motor, the conception of an entire laboratory prototype is proposed. Thermal modelling and simulations on the innovative system behaviour will validate the presented work

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Vallicelli, Matteo. "Miglioramento strutturale di un motoruota mediante ibridazione del materiale." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/24347/.

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Il seguente elaborato ha come scopo l'ottimizzazione strutturale tramite ibridizzazione del materiale di un motoruota innovativo impiegato nella vettura solare Emilia 4. La tesi si propone di fornire, innanzitutto, una panoramica sull'utilizzo combinato di materiali differenti in uno stesso componente, per poi entrare nell'ambito delle vetture elettriche dotate di motoruota in alternativa ai motori e sistemi di trasmissione tradizionali. Da qui l'analisi dell'effetto sul comfort di guida dovuto ad un aumento delle masse non sospese del veicolo a causa dell'introduzione di motori integrati all'interno delle ruote. Essendo poi il motoruota in esame ulteriormente innovativo per l'impiego di un motore a flusso assiale, se ne realizza una descrizione e un confronto rispetto ai motori radiali di uso comune in campo automotive. A seguito della descrizione del componente specifico oggetto della tesi, si conclude, infine, con l'esposizione in tutte le fasi del lavoro eseguito sui componenti del motoruota e si mostrano i disegni costruttivi in uscita per la futura realizzazione.

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Odvářka, Erik. "Motor-generátor s axiálním tokem pro hybridní autobus." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-233508.

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Tato dizertační práce se zabývá návrhem původního motor-generátoru s axiálním tokem a buzením permanetními magnety, zkonstruovaným specificky pro hybridní elektrický autobus. Návrhové zadání pro tento stroj přineslo požadavky, které vedly k této unikátní topologii tak, aby byl dosažen výkon, účinnost a rozměry stroje. Tato partikulární topologie motor-generátoru s axiálním tokem je výsledkem literární rešerše, kterou následoval výběr koncepce stroje s představeným návrhem jako výsledkem těchto procesů. Přístup k návrhu stroje s axiálním tokem sledoval „multi-fyzikální“ koncepci, která pracuje s návrhem elektromagnetickým, tepelným, mechanickým, včetně návrhu řízení, v jedné iteraci. Tím je v konečném návrhu zajištěna rovnováha mezi těmito inženýrskými disciplínami. Pro samotný návrh stroje byla vyvinuta sada výpočtových a analytických nástrojů, které byly podloženy metodou konečných prvků tak, aby samotný návrh stroje byl přesnější a spolehlivější. Modelování somtného elektrického stroje a celého pohonu poskytlo představu o výkonnosti a účinnosti celého subsytému v rozmanitých operačních podmínkách. Rovněž poukázal na optimizační potenciál pro návrh řízení subsystému ve smyslu maximalizace účinnosti celého pohonu. Bylo postaveno několik prototypů tohoto stroje, které prošly intensivním testováním jak na úrovni sybsytému, tak systému. Samotné výsledky testů jsou diskutovány a porovnány s analytickými výpočty parametrů stroje. Poznatky získané z prvního prototypu stroje pak sloužily k představení možností, jak zjednodušit výrobu a montáž stroje v příští generaci. Tato práce zaznamenává jednotlivé kroky během všech fází vývoje elektrického stroje s axiálním tokem, počínaje výběrem konceptu stroje, konče sumarizací zkušeností získaných z první generace prototypu tohoto stroje.

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Knap, Zdeněk. "Motor s axiálním magnetickým tokem pro přímý pohon čerpadla." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2015. http://www.nusl.cz/ntk/nusl-221187.

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This thesis is related to axial flux permanent magnet machines. The first part is describes the basic information about this type of machines. Main part is focused on design of the machine. For the purpose of the preliminary design there is mathematical model of the basic machine. This model is followed by finite elements analysis for the further evaluations and validation of the mathematical design. The last part is evaluating the loses of the machine ant its virtual efficiency.

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Kremer, Mickaël. "Electromagnetic design of a disc rotor electric machine as integrated motor-generator for hybrid vehicles." Thesis, Mulhouse, 2016. http://www.theses.fr/2016MULH8792/document.

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Cette thèse présente le dimensionnement d’une machine électrique à rotor disque pour la traction de véhicules hybrides. Un état de l’art complet sur les machines électriques à rotor disque permet de montrer que la machine à flux axial à rotor central est la plus adaptée. Différentes géométries du circuit magnétique sont successivement étudiées et comparées par simulations par éléments finis. Pour maximiser le rendement de la machine, les pertes d’origine électromagnétique sont étudiées. Un modèle analytique des pertes par effet de peau dans les conducteurs de cuivre est proposé et validé par éléments finis. Un second modèle analytique estime les pertes par courant induits dans les aimants permanents pour tous les points de travail de la machine se basant sur uniquement trois simulations par éléments finis permettant ainsi un gain de temps important lors du dimensionnement. Deux méthodes de dimensionnement sont comparées : le dimensionnement manuel par essais/erreurs et l’optimisation multi-objectifs. Cette dernière méthode automatise le dimensionnement et permet une optimisation plus pointue et une forte amélioration des performances. Dans ce cas, la densité de couple a par exemple été augmentée de 29%. La machine à flux axial dimensionnée est comparée avec une machine à flux radial pour véhicules hybrides. Cette comparaison révèle le potentiel de la machine à flux axial avec notamment une densité de couple augmentée de plus de 20%. Enfin, deux prototypes ont été construits et mesurés pour valider les simulations This PhD presents the design of a disc rotor electric machine for the traction of hybrid vehicles. A complete state of the art enables the selection of the internal rotor axial flux machine which is the most suited to this application. Different geometries of the magnetic circuit are successively studied and compared with finite elements simulations. To maximize the efficiency of the machine losses generated in the magnetic circuit are studied. An analytic model on the skin effect in the copper conductors is proposed and validated with finite elements simulations. A second analytic model estimates the eddy current losses in the permanent magnets for every operating point of the machine based on only three finite element simulations enabling an important time-saving. Two dimensioning methods are compared: the manual dimensioning based on a tries/errors method and the multi-objectives optimization. This last method automates the dimensioning and enables a more refined optimization and a strong improvement of the performances. For example, the torque density has been improved by 29% in that case. The designed axial flux machine is compared to a state of the art radial flux machine for hybrid vehicle. This comparison shows the potential of the axial flux machine with an improvement of the torque density by more than 20%. Finally two prototypes have been built and measured to validate the simulations

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Belhadi, M'hamed. "Étude de machines à réluctance variable pour une application de traction électrique : réduction des ondulations de couple et des efforts radiaux." Thesis, Paris 11, 2015. http://www.theses.fr/2015PA112185.

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Le mémoire traite de la machine à réluctance variable en proposant d'une manière simultanée et du point de vue conception des solutions à ses deux inconvénients majeurs à savoir les ondulations de couple et les efforts radiaux. Les premières se propagent le long de la chaine de transmission diminuant ainsi le confort des usagers et les deuxièmes sont à l’origine d’une nuisance sonore. Dans une première partie et en s’intéressant à une structure axiale caractérisée par une faible force radiale, un bilan sur cette structure est donc établi. En effet, une configuration à deux stators et un rotor est la plus adéquate pour éventuellement remplacer la machine radiale de référence. Cette structure axiale est comparée à cette machine de référence après avoir établi des règles de passage d’une structure à une autre. Un premier passage est effectué en gardant le même encombrement et un deuxième passage en dimensionnant la machine axiale pour satisfaire le même cahier des charges que la machine radiale. Dans une deuxième partie, le travail s’oriente vers la modification de la structure radiale de la machine de référence et son optimisation. Plusieurs modifications sont proposées dont une structure avec une cale magnétique qui est la plus performante. Des optimisations géométriques à l’aide de l’algorithme génétique sur un point de fonctionnement sont ensuite effectuées pour remédier aux deux problèmes. A la fin, un récapitulatif de plusieurs structures optimisées est proposé pour servir de référence. Le choix de la machine la plus adéquate pourra donc être effectué en faisant un compromis entre la maximisation du couple, la réduction de ses ondulations et la réduction des efforts radiaux This report deals with switched reluctance motor by offering design solutions to the drawbacks of torque ripples and radial forces in the same time. Torque ripples reduce the user comfort and radial forces are the origin of noise. In the first part, an axial structure characterized by low radial force is analysed. Indeed, an axial configuration with two stators and one rotor is the most appropriate to replace the reference radial machine. Ones the rules of passage from one structure to another are established, the axial structure is then compared to the reference one. A first passage is made by keeping the same volume and a second one by sizing the axial machine with the same specifications as the radial one. In the second part, the work concerns the modification of radial structure of the reference machine and its optimization. Several modifications are proposed including a structure with a magnetic wedge which is the most efficient. Geometric optimization using genetic algorithm are then performed on operating points to remedy the both problems. In the end, several optimized structures are proposed. The choice of the most suitable machine can be done by making a compromise between the torque maximization, reducing its ripples and reducing radial forces

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Pruša, Radomír. "Pohon pro bezucpávkové čerpadlo." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2018. http://www.nusl.cz/ntk/nusl-377021.

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The aim of this thesis is to design a drive for seal-less centrifugal pump. Designed motor with axial magnetic flux is a double-sided structure with an internal coreless stator. The construction of the seal-less pump is based on a patent no. 17818, which was created at the Victor Kaplan Department of Fluid Engineering BUT. Potential use of this assembly is mainly in the food industry, possibly in the field of chemically aggressive liquids. The whole design is based on coordination between analytical equations and finite element method of the software ANSYS Maxwell. The temperature ratios inside the motor were investigated when cooling with air by the iterative solution of thermal circuit. The work includes research on the topic of constructing the axial machines and their applications in pumps. A comprehensive specification of the entire seal-less centrifugal pump is given in Chapter 4.

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Linder, Johan. "An integrated brake disc and electric drive for vehicle propulsion : A FEASIBILITY STUDY." Thesis, KTH, Skolan för elektro- och systemteknik (EES), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-187652.

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In this thesis, the feasibility to integrate an brake disc and electric machine is investigated. In wheel motors (IWMs) have several advantages, such as saving space in the vehicle, individual and direct control at the wheels and the absence of a mechanical transmission. However, today’s IWMs are heavy and, thus, negatively affect the driving performance of the vehicle due to the increase of the unsprung mass. By integrating an already existing part in the wheel, this increase of the unsprung mass can be minimized. The brake disc manages high temperatures, a signiﬁcant wear in rough environ-ment, which puts high demands on the rotor. The second part of the machine, the stator, will be signiﬁcantly affected by the high temperatures of the rotor. The temperatures of the stator are transferred by convection, conduction and radiation from the rotor or brake disc. Liquid cooling of the stator back is analyzed as a potential solution for handling the high temperatures. In order to analyze the feasibility of the concept, thermal, electric and mechanical modelling has been used. The evaluation whether it is possible or not to integrate the brake disc has been with regard to the results of weight, cost, thermal tolerance and electric performance. I detta arbete undersöks möjligheten att integrera en bromsskiva med elmaskin. Hjul-motorer har ﬂera fördelar, bland annat sparas utrymme i själva bilen, individuell kontroll samt drivning av hjulen utan mekaniska transmissioner. Men hjulmotorer som kan användas idag väger oftast så pass mycket att den odämpade massan ökar kritiskt och köregenskaper av fordonet då blir lidande. Genom att integrera en beﬁntlig del i hjulet kan ¨okningen av odämpade massan minskas. Att använda bromsskivan som rotor, kräver att denna tål temperaturer ¨over 500◦C samt påfrestningar och slitage som en vanlig mekanisk friktionsbroms måste uthärda. Den andra delen av maskinen, statorn kommer även denna att påverkas av de höga temperaturerna av bromsskivan som kommer ledas via konvektion, konduktion och strålning. Möjligheten att kyla statorn med vätska och om detta är tillräckligt undersöks. För att analyserna genomförbarheten av projektet har termiska, elektriska och mekaniska modeller använts. Resultaten har analyserats där maskinens vikt, kostnad, termisk tålighet och elektrisk prestanda har legat till grund för bedömningen om lösningen; att integrera en broms-skiva med elmaskin är rimlig eller ej.

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Kokko, V. (Voitto). "Condition monitoring of squirrel-cage motors by axial magnetic flux measurements." Doctoral thesis, University of Oulu, 2003. http://urn.fi/urn:isbn:9514269381.

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Abstract The aim of this research work is to develop a tool for condition monitoring of squirrel-cage motors using axial magnetic flux measurements, and to design a diagnostics system for electrical motors. The basic theory of the measurements and systems was found through literature reviews and was further developed from the experimental results of this research work. Fluxgate magnetometers and Hall effect sensors are not reliable enough for condition monitoring purposes, but measurements by flux coil sensors can reach adequate reliability. The useful frequency area of the flux coil sensor is from about 0.2 Hz to 15 kHz, an area is well applicable for condition monitoring of squirrel-cage motors. Output voltage is frequency dependent, increasing towards higher frequencies. Sufficient sensitivity is usually reached by a flux coil sensor having a diameter of about 30 cm and the number of turns of about 200. Sensitivity can be improved by increasing the diameter or number of turns of the coil. The sensor should be placed axially centred on the end of the motor, and measurements should be made with the loaded motor in steady operation. Output voltage is typically from the microvolt to millivolt level, however, installation inside the motor can increase it from tens of millivolts to some volts. The dynamic resolution requirement of measurement is about 70 dB and the highest line resolution needed for the spectrum analysis is about 3200 lines. Time base signal can be used to study rapid disturbances of flux caused by mechanical loading or switching of the frequency converter. Various motor failures cause specific variation to the frequency distribution of flux, so spectrum analysis is well applicable for condition monitoring. Reference measurement of each motor is required because stator winding factors, installation tolerances, operating conditions and mechanical load affect leakage flux. A broken rotor bar failure can be detected from the amplitude difference between the supply frequency and its rotor bar induced sideband. A broken rotor end ring failure can be detected by the amplitude difference between the slip frequency and the supply frequency. However, it was found that the stator current spectrum is a more reliable method of detecting both these rotor failures. The supply voltage asymmetry can also be evaluated by specific sidebands of axial flux. Turn to turn failure of the stator winding was most reliably detected by sidebands around the rotor slot pass frequencies. Equations for frequency converter supplied motors are the bases for similar equations, but the supply frequency is replaced by the output current frequency of the converter. The developed diagnostics system design for condition monitoring of ac motors includes stator current, flux coil, temperature, vibration, partial discharge, bearing current and voltage measurements. At the system diagnosis stage these measurable signals are divided to time base and frequency base signals and for each of them a fault indicator is determined. For flux coil measurements four fault indicators were found: rotor bar failure ratio, rotor end ring failure ratio, stator winding turn to turn ratio and supply voltage asymmetry operation ratio. With these failure indicators we determine failure location, state and cause. From this information a lifetime prediction of the motor is made. The results of this work are used to analyse flux coil measurements of squirrel-cage motors. In addition the research has led to a special application to monitor electric motors using an on-line condition monitoring system for paper machines and power plants.

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Saavedra, Ordóñez Harold. "Analysis and design of fault tolerant axial flux permanent magnet synchronous motors." Doctoral thesis, Universitat Politècnica de Catalunya, 2015. http://hdl.handle.net/10803/286323.

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Electric vehicles (EVs) are attractive comparted to internal combustion engine powered vehicles due to several benefits, including low emissions, higher efficiency, less maintenance costs, stronger acceleration or lower fuel price, among others. EVs require traction motors with especial features, including high efficiency, high power and torque density, compactness, precise torque control, extended speed range. This work focuses on the analysis and optimal electromagnetic design of fault tolerant permanent magnet synchronous motors. The study is mainly based on the research of analytical design procedures and the effect of electrical faults in the motor behavior, according to the configurations of each machine. The study will be developed by using analytical tools, and validated by applying 2-D and 3-D finite element methods (FEM). A brief study about the main achievements regarding the design of fault tolerant machines is made, identifying the possible improvements and main rules of design in this kind of machines. Then a study focused on the requirements of a fault tolerant design is made, in order to select the appropriate motor configuration. Since the consequences of inter-turn faults can be catastrophic in PMSMs, chapter 3 studies the influence of the winding configuration on the detection of such faults. This detection is based on the analysis of the stator currents and the (zero-sequence voltage component) ZSVC spectra. Several types of winding configurations are selected for analysis i.e. fractional- and integral-slot windings, overlapping- and non-overlappingwindings, single- and double-layer, full- and short-pitch, constant- and variable-pitch windings. Taking into the fault tolerant tendencies about the redundancy of the system, the study of the effect of inter turn fault is extended to the five phase machine, thus a parametric model of the five-phase PMSM is developed, this model accounts for the effects of inter-turn faults. This parametric model is used to select the harmonic frequencies to be studied to detect such faults. Likewise, the amplitudes of these harmonic frequencies are further analyzed by means of FEM simulations, therefore showing the potential of the proposed system to detect inter-turn faults in their early stage, which is a desirable characteristic for a fault tolerant system. The demagnetization effect on AFPMM torque is also analyzed. The main objective was to study the influence of the magnet shape in the performance of an AFPMM working under faulty condition, in order to select the most suitable type of magnet for the design of a fault tolerant machine. After an exhaustive analysis of the main electromagnetic faults on PMSMs, the work is focused on the optimal electromagnetic design of an AFPMM. The optimal design is based on a set of analytical equations whose accuracy is validated by means of FEM simulations. Next, to find the optimal solution, the huge set of possible motor solutions is explored by means of computationally efficient optimization algorithms leading to an optimum solution while minimizing the computational burden. The set of analytical equations are solved to obtain the geometrical, electric and mechanical parameters of the optimized AFPMM and several design restrictions are applied to ensure fault tolerance capability, along with the recommended features that have been drawn from the fault analysis study. Finally, a dual outer rotor AFPMM with NN configuration for automotive applications is optimized by applying accurate analytical sizing equations and taking into account fault tolerant constraints. For optimization purpose, a multi-objective design strategy is applied, in which the optimization variables are the motor efficiency and power density and ten input geometric and electric parameters are considered, with their respective bounds and constraints. At last the model is verified by applying 3D-FEM simulations and the main performance characteristics are compared. Debido a las nuevas políticas de conservación medio ambiental, los vehículos eléctricos toman una posición más importante en la sociedad actual. Los motores eléctricos constituyen el corazón de la cadena de tracción de un EV, por esta razón se debe encaminar la investigación hacia el diseño de motores de mayor eficiencia y fiabilidad. Este trabajo se enfoca en el análisis y diseño óptimo de un motor de flujo axial con tolerancia a fallos. Como base, se parte de la investigación de los procedimientos analíticos de diseño de motores eléctricos y del estudio de los efectos de los fallos eléctricos en el comportamiento de estos, de acuerdo a la configuración específica de cada máquina. Para desarrollar esta tesis se hará uso de herramientas analíticas y de métodos de simulación basados en métodos finitos (FEM). En primera parte se hace un estudio del estado del arte del diseño de motores eléctricos tolerantes a fallos, en el cual se identifican las posibles configuraciones a usar y las principales reglas de diseño de estos motores. Debido a que las consecuencias de un cortocircuito entre espiras pueden ser catastróficas para el motor de imanes permanentes, en el siguiente capítulo se analiza su efecto en dependencia de la configuración de los devanados del motor, además de su posible detección. La detección del cortocircuito se basa en el análisis del espectro de frecuencias de las corrientes del estator y la componente homopolar de voltaje (ZSVC). Para este estudio se seleccionan los 5 tipos de bobinados generalmente usados en motores eléctricos. Tomando en cuenta las tendencias de sistemas tolerantes a fallos de utilizar la redundancia de elementos, el estudio del cortocircuito se extiende al motor de 5 fases, para esto se desarrolla un modelo paramétrico del motor, el cual es utilizado para seleccionar los armónicos de frecuencias que permitan la detección del cortocircuito entre espiras en su fase más temprana. De la misma manera estos armónicos son analizados en modelos de simulación por elementos finitos, probando su potencial para el desarrollo de algoritmo de detección de fallos, característica deseable en los sistemas tolerantes a fallos. En última parte de este capítulo se estudia el efecto de la desmagnetización en el comportamiento de motores, en particular la influencia de la forma de los imanes cuando el motor funciona en régimen de fallo, como conclusión de este estudio se selecciona la forma de imán que mejor se comporta ante este tipo de fallos. Una vez analizado los posibles fallos eléctricos en el motor, el trabajo se centra en el diseño electromagnético óptimo de una máquina de flujo axial. El diseño optimo se apoya en el uso de ecuaciones analíticas del motor (AFPMM) y se valida por medio de simulaciones FEM. Para lograr el diseño óptimo de hace uso de algoritmo de optimización heurísticos, en particular los algoritmos genéticos. A estos algoritmos se les aplica las restricciones anteriormente encontradas en los estudios de fallos y en el estado de arte de motores tolerantes a fallos. Finalmente aplicando una serie de ecuaciones analíticas y teniendo en cuenta las restricciones de un diseño tolerante a fallos previamente seleccionadas se obtiene el diseño electromagnético óptimo de un motor de flujo axial tolerante a fallos. Para el proceso de optimización se utilizan algoritmos genéticos multi-objetivos en donde se busca maximizar la densidad de potencia y la eficiencia. Por último, el modelo del motor pentafásico de flujo axial es verificado por medio de simulaciones en elementos finitos.

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Scowby, Seath. "Thermal management of an axial flux permanent magnet machine considering heat pipes." Thesis, Stellenbosch : Stellenbosch University, 2003. http://hdl.handle.net/10019.1/53676.

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Thesis (MScEng) -- Stellenbosch University, 2003. ENGLISH ABSTRACT: Axial Flux Permanent Magnet (AFPM) machines have become attractive because of significant improvements in permanent magnets over the past decade, improvements in power electronic devices, and the ever increasing need for more efficient machines in electric vehicle systems. In comparison with the cylindrical radial flux motor, the AFPM machine is better in a number of aspects: short frame; compact construction; high efficiency; brush less construction; good starting torque and high-power density. The common modes of failure and typical operating conditions of AFPM machines are discussed further. The focus of this research project is a prototype AFPM machine developed by the Electrical Engineering Department of The University of Stellenbosch. The machine considered has a power rating of 300 kW and an operating efficiency of 95 % at a speed of 2300 rpm. This specific machine is used as an example to illustrate the thermal characteristics of geometrically similar AFPM machines. The thermal characterization was achieved with the use of two numerical computer models. Firstly a fluid model was specially developed and experimentally verified. The objective of the fluid model was to calculate the mass flow rate of air through any geometrically similar AFPM machine. The fluid model was further used to investigate the effects of different magnet thickness and axial gaps between the stator and the rotor plates on the mass flow rate of air through the machine. The fluid model was verified with experimental testing that was done on a half-scale Perspex model. During the experimental testing the magnet thickness was varied between 2.5 mm, 5.0 mm, and 7.5 mm along with axial gaps of 6.5 mm, 7.5 mm, 8.5 mm, and 9.5 mm. The fluid model showed a correlation to within 10 % of the experimental mass flow rates. The results of these tests showed that the magnet thickness and axial gap between the stator and the rotor plates had no significant effect on the mass flow rate of air. The fluid model was based on one-dimensional, steady-state, and incompressible flow. The second numerical computer model was a thermal model. This model was used to calculate the transient temperature response of the AFPM machine. The model was based on a twodimensional transient finite difference solution technique. Experimental temperatures taken from the prototype AFPM machine were used to verify the thermal model. Correlations between the experimental and theoretical temperatures were within 5.8 % of each other. The thermal model was used to investigate the effect of geometrical changes on the temperatures in the AFPM machine. It was found that these geometrical changes had no significant effect on the temperatures in the AFPM machine. It was also established that increasing the air mass flow rate over about I kg/s had no further effect on lowering the temperatures. The stator was also identified as being the most critical component as it reached its maximum temperature limit before any other component. Heat pipes were considered as an alternative thermal management technique. The location of the heat pipe was limited to the stator. Further simulations were done to investigate the effect of the heat pipe properties on the amount of heat removed from the stator. Recommendations were made concerning the thermal management of the current and possible future prototype AFPM machines. It was recommended that a further more detailed investigation into the use of heat pipes be considered. This recommendation is substantiated by the fact that in this research project only one type of heat pipe was considered and its location was limited to within the stator. AFRIKAANSE OPSOMMING: AFPM masjiene het meer aantreklik geword weens betekenisvolle verbeteringe in permanente magnete gedurende die laaste dekade, verbeteringe in elektroniese toestelle en die vraag na meer effektiewe masjiene in elekriese voertuigstelsels. Die AFPM masjien is beter as die Silindriese Radiale Fluksie Motor wat die volgende aspekte betref: die kort raamwerk; kompakte konstruksie; hoe effektiwiteit; borsellose konstruksie; goeie aanvangsdraaimoment; en hoe-krag digtheid. Die algemene vorms van faling en ook die tipiese werkstoestande van die AFPM word verder bespreek. Hierdie navorsingsprojek fokus op die prototipe AFPM masjien wat ontwikkel is deur die Elektriese Ingenieurs Departement van die Universiteit van Stellenbosch. Die masjien onder bespreking wek 300 kW per uur op en is 95% effektief teen 'n spoed van 2300 rpm. Hierdie masjien word gebruik om die termiese kenmerke van geometries-gelyksoortige masjiene te illustreer. Die termiese eienskappe is bepaal deur die gebruik van twee numeriese rekenaarmodelle. Eerstens is 'n vloeistofmodel spesiaal ontwerp en eksperimenteel geverifieer. Die doel van die vloeistofmodel was om die massa vloeitempo van lug deur enige geometries-gelyksoortige AFPM masjien te bereken. Die vloeistofmodel is verder gebruik om die uitwerking van verskillende magneetdiktes en aksiale gapings tussen die stator en die rotorplate op die massa vloeitempo van lug deur die masjien te ondersoek. Die vloeistofmodel is geverifieer deur eksperimentele toetsing wat gedoen is op 'n halfskaal Perspex model. Tydens die toetsing het magneetdiktes gewissel tussen 2.5 mm, 5.0 mm en 7.5 mm en die aksiale gapings tussen 6.5 mm, 7.5 mm en 9.5 mm. Die vloeistof model het 'n korrelasie van binne 10 % van die eksperimentele massa vloeistempo getoon. Die resultate van hierdie toetse het getoon dat die magneetdiktes en die aksiale gapings tussen die stator en die rotorplate geen noemenswaardige uiterking op die massa vloeitempo van lug gehad het nie. Die vloeistofmodel is gebaseer op een-dimensionele, gestadigde, onsamedrukbare vloei. Die tweede numeriese model was 'n termiese model. Hierdie model is gebruik om die transiente temperatuur respons van die AFPM masjien te bereken. Die model is gebaseer op 'n tweedimensionele, transiente eindige-verskil oplossingstegniek. Eksperimentele temperature gemeet op die prototipe AFPM masjien is gebruik om die termiese model te verifeer. Die eksperimentele en teoretiese temperature het binne 5.8% met mekaar gekorrelleer. Die termiese model is gebruik om die uitwerking van geometriese veranderinge op die temperatuur in die AFPM masjien te ondersoek. Daar is gevind dat hierdie geometriese veranderinge geen noemenswaardige uitwerking op die temperature van die AFPM masjien gehad het nie. Daar is ook vasgestel dat 'n vermeerdering in die lug massa vloeitempo yerby I kg/s geen verdere uitwerking het op die verlaging van die temperatuur gehaad het nie. Die stator is ge-identifiseer as die mees kritiese komponent aangesien dit sy maksimum temperatuur limiet bereik het voor enige ander komponent, Hittepype is oorweeg as 'n alternatiewe termiese bestuurstegniek. Die plasing van die pype is tot die stator beperk. Verdere simulasies is uitgevoer om die uitwerking van die hittepyp eienskappe op die hoeveelheid hitte wat verwyder word van die stator te ondersoek. Aanbevelings is gemaak m.b.t die termiese bestuur van die huidige en moontlike toekomstige prototipes van AFPM masjiene. Daar is aanbeveel dat daar in meer besonderhede ondersoek ingestel word na die gebruik van hittepype. Die rede hiervoor is dat daar in hierdie studie net gebruik gemaak is van een tipe hittepyp en dat die plasing daarvan beperk is tot binne die stator.

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Mbidi, David Natangue. "Design and evaluation of a 300 kW double stage axial-flux permanent magnet generator." Thesis, Stellenbosch : Stellenbosch University, 2001. http://hdl.handle.net/10019.1/52177.

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Thesis (MScEng)--Stellenbosch University, 2001. ENGLISH ABSTRACT: This thesis deals with the design and evaluation of a 300 kW double stage axial-flux permanent magnet generator with an ironless stator. The magnetic and electrical design equations are derived for sinewave and quasi-squarewave axial-flux permanent magnet machines. The thermal design approach used is also described. The machine is optimised for maximum torque per current loading. A Matlab program code is developed to do the necessary calculations in the design optimisation and the calculation of the machine parameters. Mechanical finite element simulations are conducted to investigate the severity of the magnetic attraction force between the rotor discs. The results obtained from the simulations suggested an increase in the yoke thickness in order to withstand the attraction force. The construction of the prototype machine's rotor and stator is described. The flux density in the airgap is thoroughly investigated through measurements and analysis. Thermal measurements are also conducted to investigate the effect of eddy currents in the stator winding. Furthermore, no-load measurements conducted on the 300 kW machine showed that the machine has a serious problem of circulating currents in the parallel connected coils. Possible solutions for this are investigated and recommendations are given. Due to the circulating current problem and the relative high eddy current losses, it was not possible to do full-load tests on the machine. AFRIKAANSE OPSOMMING: Hierdie tesis handeloor die ontwerp en evaluering van 'n multi-stadium Aksiale Vloed Permanente Magneet (AFPM) masjien met 'n ysterlose stator. Die magnetiese - en elektriese ontwerp-vergelykings is afgelei vir sinusgolf en quasi vierkantsgolf AFPM masjiene. Die termiese ontwerp word ook bespreek. Die masjien is geoptimeer vir maksimum draairnoment per stroombelasting. Daar is 'n program-kode in Matlab geskryf om die nodige berekeninge vir die optimering van die masjien uit te voer en vir die bepaling van die masjien-parameters. Meganiese eindige element berekenings is gedoen om die invloed van die magnetiese aantrekkingskrag tussen die rotorskywe te ondersoek. Die resultate het aangedui dat die rotorskyfdikte nie die magnetiese aantrekkingskrag van die magnete kan weerstaan nie en moes in dikte vedubbel word. Die konstruksie van die masjien se rotor en stator is behandel. Die vloeddigtheid in die luggaping is noukeurig ondersoek deur metings en analise. Termiese metings is ook gedoen om die invloed van die werwel strome in die statorwikkelings te ondersoek. Verder het die nullas-toetse wat gedoen is op die masjien, aangedui dat die masjien 'n ernstige probleem het met sirkuierende strome in die parallelle geleiers van die statorspoele. Moontlike oplossings is ondersoek en aanbevelings word gegee. Dit was nie moontlik om vollastoetse op die masjien te doen nie, as gevolg van die probleem met sirkuierende strome en die relatiefhoë werwelstoom-verliese in die statorwikkelings.

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Dolisy, Bastien. "Étude d’un moteur supraconducteur à flux axial avec une transmission magnétique supraconductrice intégrée." Thesis, Université de Lorraine, 2015. http://www.theses.fr/2015LORR0079/document.

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Nous proposons l’étude d’une machine supraconductrice à flux axial composée d’un stator bobiné en cuivre et d’un inducteur avec des solénoïdes supraconducteurs à hautes températures critiques (HTc). Ce type de machine est adapté pour des applications de fortes puissances (plusieurs MW) avec de faibles vitesses de rotation (quelques centaines de tr/min), comme la propulsion de navire. Un accouplement magnétique, intégré au moteur, est utilisé pour transmettre le couple de l’inducteur supraconducteur vers la charge à température ambiante sans contact. On peut ainsi se passer des « torques tubes » qui sont habituellement présents dans les moteurs supraconducteurs pour relier mécaniquement l’inducteur à la charge et ainsi réduire les pertes thermiques par conduction. De plus, les accouplements magnétiques offrent une protection naturelle contre les surcharges mécaniques. Pour évaluer les performances de la solution proposée, nous avons développé un modèle analytique en 3D prenant en compte le comportement non linéaire des supraconducteurs en fonction du champ magnétique appliqué et de la température de fonctionnement. Ce modèle est ensuite intégré dans un processus de dimensionnement utilisant un algorithme génétique multi objectifs. Les résultats de cette optimisation montrent un gain en compacité (machine avec accouplement magnétique) 2 à 3,5 fois plus importants par rapport à des machines conventionnelles. Un prototype de machine supraconductrice à flux axial avec accouplement magnétique intégré est aussi réalisé. La conception, la fabrication et les tests sont présentés dans ce manuscrit. Tous les résultats sont validés par des calculs par éléments finis The study of an axial-field high temperature superconducting (HTS) motor for applications requiring high torque densities is proposed. The HTS motor consists of a stator with copper winding and an inductor with superconducting coils. A HTS magnetic coupler is used as a part of the system, to transmit the torque from the HTS motor to the load. This solution is a good alternative to the usually used torques tubes as it results in the reduction of conduction thermal losses and offers an intrinsic protection against overloads. To evaluate the performance of the studied device, a 3D electromagnetic analytical model has been developed. This model takes into account the dependence on the applied magnetic field and temperature of the HTS material. Finally, a genetic algorithms optimization of the studied device is carried out to find the optimum geometric dimensions. The results show that the proposed solution (machine with magnetic coupling) is about 2 to 3,5 times more compact than a conventional machine drive solution. An axial-field HTS motor with integrated magnetic coupling has been also designed, constructed and tested. The test results have been checked by 3D finite element computations

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Kierstead, Harold Junior. "Design of a single-sided axial flux PM in-wheel electric vehicle machine with non-overlap stator windings." Thesis, Stellenbosch : University of Stellenbosch, 2009. http://hdl.handle.net/10019.1/2007.

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Thesis (MScEng (Electrical and Electronic Engineering))--University of Stellenbosch, 2009. ENGLISH ABSTRACT: With the current worldwide energy problems electric vehicles are set to replace conventional combustion engine vehicles. Electric vehicles with gearless in-wheel mounted brushless permanent magnet motors provide a more flexible and efficient means of vehicle propulsion but the electric motors, particularly the non-overlap stator winding type have not been fully researched. This study focuses on the selection and design of suitable in-wheel hub drive machine. Several machine topologies are evaluated and the single-sided axial flux machine is chosen. The average vehicle requirements are determined and design optimisations are carried with the aid of finite element analysis and an optimisation algorithm. A comparison of torque quality between single-layer and double-layer machines is carried out and it is found that double-layer machines have the least torque ripple and single-layer machines with un-equal teeth the best torque per ripple characteristics. A 16 kW, 30-pole 27-slot prototype machine optimised for power density is built, and it is found fitting for the application meeting the design requirements. The prototype machine is extensively tested and good agreement is found between finite element and measured results. The well known axial flux attraction forces are encountered in the prototype machine and they are overcome by suitable bearing selection and mechanical design. It is found that theoretical and measured cogging torques are inconsistent, the reason for this is that practical machines are not absolutely ideal due to material and manufacturing tolerances. Excessive rotor losses are found in the prototype machine and appropriate methods for their reduction are presented. This work does not aim to find the best in-wheel hub drive solution, but instead looks to uncover some of the technical available solutions. AFRIKAANSE OPSOMMING: Met die huidige wêreldwye energie probleme, is elektriese voertuie bestem om konvensionele binnebrandenjin voertuie te vervang. Elektriese voertuie met ratlose binnewiel-geleë borsellose permanente magneet motors, voorsien „n meer aanpasbare en effektiewe metode van voertuig aandrywing, maar die elektriese motors, veral die oorvleulende stator winding tipe is nog nie ten volle nagevors nie. Hierdie studie fokus op die keuse en ontwerp van „n binnewiel aandryf masjien. Verskeie masjien uitlegte word geëvalueer en „n enkelkant aksiaalvloed masjien is gekies. Die gemiddelde voertuig behoeftes word bepaal en ontwerp optimalisering word uitgevoer met behulp van eindige element analise en „n optimaliserings algoritme. Enkellaag en dubbellaag masjiene se draaimoment kwaliteit word vergelyk. Die bevinding is dat dubbellaag masjiene die laagste draaimoment rimpel toon terwyl die enkellaag masjiene, met oneweredige tande, die beste draaimoment per rimpel karakteristieke toon. „n 16 kW, 30 pool, 27 gleuf prototipe masjien, wat vir drywingsdigtheid ge-optimaliseer is, is gebou en is geskik vir die toepassing en die vereistes. Die prototipe masjien is getoets en goeie vergelykings word getref tussen die eindige element analise en die gemete resultate. Die alom bekende aksiaal vloed aantrekkings kragte word in die prototipe masjien gesien en word oorkom deur die regte rollaer keuse en meganiese ontwerp. Nog „n bevinding is dat die teoretiese en gemete waardes vir die vertandings draaimoment nie ooreenstem nie. Die rede hiervoor is dat die praktiese masjien nie ideaal is in terme van materiaal en vervaardigings toleransies nie. Groot rotor verliese in die prototipe masjien is gevind en goeie metodes vir die minimering daarvan word voorgestel. Hierdie werk is nie „n soektog na die beste binnewiel aandrywings oplossing nie, maar mik eerder om sommige van die tegniese beskikbare oplossings te onthul.

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Verez, Guillaume. "Contribution à l’étude des émissions vibro-acoustiques des machines électriques : cas des machines synchrones à aimants dans un contexte automobile." Thesis, Le Havre, 2014. http://www.theses.fr/2014LEHA0024/document.

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Dans un contexte automobile électrique et hybride, la part des machines synchrones à aimants permanents s'est accrue exponentiellement. Cette évolution s'accompagne d'exigences en termes d'émissions vibro-acoustiques. En termes de dimensionnement de la chaîne de traction, l'analyse multiphysique du moteur s'avère être un enjeu crucial pour son développement. La nécessité de disposer de codes informatiques de conception possédant des temps de calcul faibles pour une précision maximale se fait ressentir pour l'exploration de solutions potentiellement performantes dans les premières étapes du processus de dimensionnement. A ce titre, les aspects vibratoires et acoustiques sont modélisés analytiquement et par éléments finis dans la présente thèse. Ainsi, au moyen du modèle magnétique, l'analyse magnéto-vibro-acoustique faiblement couplée (résolution itérative des différentes physiques) peut être réalisée.La thèse est découpée en quatre parties. La première expose un état de l’art sur les émissions vibro-acoustiques des machines et notamment la modélisation du bruit d’origine magnétique. Les problématiques de la modélisation sont détaillées. Dans une deuxième partie, les modèles sont largement décrits. Les modèles éléments finis sont validés expérimentalement. Une troisième partie se propose de valider les modèles analytiques par éléments finis, en complexifiant progressivement la géométrie d’une machine à aimants montés en surface à flux radial. Enfin, la dernière partie utilise les modèles éléments finis pour étudier des machines non-conventionnelles comme les machines à commutation de flux et les machines à aimants en surface à flux axial The proportion of permanent magnets synchronous motors used for electric and hybrid automotive traction has exponentially increased during the past decade. This evolution comes with ever-demanding low noise and vibrations requirements. Multi-physics analysis of the motor is a decisive issue for the development of the powertrain. For the exploration of potentially efficient motor solutions in first design steps, it is thus a necessity to have at disposal fast and accurate computer codes. In this respect, acoustic and vibratory aspects are modeled using finite element and analytical models in this thesis. As a result, using an electromagnetic model, the weakly-coupled magneto-vibro-acoustic analysis (iterative solving of each physic) can be performed.The thesis is divided into four parts. The first part states the art on machine vibro-acoustic emissions and focuses on noise of magnetic origins modeling. Issues of modeling are detailed. Then, models are described to a great extent in the second part. Finite element models are favorably compared to experimental measures. A third part validates analytical models in comparison to finite element analysis, by gradually complicating the geometry of a surface permanent magnets radial flux machine. Finally, a fourth part uses finite element models to study non-conventional machines such as flux switching radial flux machines and surface permanent magnets axial flux machines

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Sheng-JIe-Bai and 白勝傑. "Single Phase Axial Flux Switching Motor Design." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/94te9g.

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碩士 國立臺北科技大學 電機工程研究所 103 Flux-switching motor is a newly developed motor which became popular in recent years. Its structure is similar to switched reluctance motor, its rotor and stator are all salient structure, armature winding and field winding are wound in the stator. There are two main advantages of this: one being its simple structure makes it stable and durable. Secondly, the heat in the motor can be dissipated easily, because all of excitation source are located in the stator. This research aims to design a single-phase axial switching flux motor. Its specification is modeled on the DC series wound motors which is currently on market. The design starts with specific torque-speed curve analysis so the number of rotor and stator slots poles can be decided. and do a preliminary design based on the appearance of a DC series wound motor. Followed by a sensitivity analysis to find out the appropriate parameters, which are used improve the preliminary design. Besides the analysis and simulations, a prototype of the motor is also made to verify the simulation results.

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Liu, Chia-Hsi, and 劉佳熹. "Optimal Design of Axial Flux Wheel Motor." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/37661317774150218006.

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碩士 國立臺灣大學 機械工程學系研究所 86 Recently, direct-driven wheel motors have been widely applied to electric vehicles, where transmission mechanism and gearbox are not necessary, and ther efore, mechanical loss can be avoided. Axial-flux permanent magnet (AFPM) moto rs can be designed and constructed to achieve a higher torque-to-weight ratio and motor efficiency, and are suitable for wheel motor applications. This pape r presents the procedure of an optimal design of axial-flux permanent motors. First, a set of mathematical models is developed to describe the APFM design i n terms of the design variables. Then, the optimal shape of motor is determine d by the optimization technology to meet various specifications and constraint s. The design results are investigated by the 2D electromagnetic analysis, and the final design decision is made through engineering experience and manufact uring requirements.

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Zhao, Ying-Zhi, and 趙英志. "Development of a Direct-Drive Axial Flux Wheel Motor." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/55403443847631481348.

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碩士 淡江大學 機械與機電工程學系碩士班 93 The purpose of this paper is to design a direct-drive axial flux wheel motor. The motor dimensions are determined based on the required rating. A set of magnetic circuit models are used to calculate the basic motor characteristics and the design which has the shortest axial length is selected. The static and dynamic performance of the designed motor are calculated and verified with a finite element software. A prototype motor and driver is built to verify the performance of the motor experimentally. Finally, a passive magnetic bearing is designed to reduce the radial force acting on the motor bearings; the analysis shows that the bearings’ life can be extended with this design.

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Cheung, Cheng-Huei, and 張崢輝. "Analysis and Optimal Design of Axial Flux Wheel Motor." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/80838751761000541718.

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碩士 國立臺灣大學 機械工程學研究所 88 Axial-flux permanent magnet (AFPM) motors can be designed to achieve a higher torque-to-weight ratio and motor efficiency, and are suitable for wheel motor applications. In permanent magnet reluctance motors, both magnets and electric steel are placed in the rotor. A reluctance torque component is added to total torque while there are steel in the rotor. This paper presents the procedure of an optimal design of APFM motor, including brushless dc motor and permanent magnet reluctance motors. First, a set of mathematical model is developed to describe the APFM design in terns of the design variables. Then the optimal shape of motor is determined by the optimization technology to meet various specifications. The design results are investigated by the 2D electromagnetic analysis. Finally comparison of brushless dc motor and permanent magnet reluctance motors is made.

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Tseng, Chun-Chih, and 曾群智. "Design Optimization of Axial Flux Motor by Genetic Algorithm." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/fuqygq.

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碩士 國立臺北科技大學 電機工程系 106 This thesis investigates design optimization of an axial flux permanent magnet synchronous motor. Comparing to traditional radial flux motor, axial flux motor have the advantages of higher power density, torque density and space utilization. A finite element analysis software is used for machine design and performance analysis. The specification and dimensions of the initial design model is based on a 5.0 kW axial flux machine produced by EMRAX. After the initial design, machine structure parameters such as PM width, shoe width, and core high selected as the control variables for sensitivity analysis and single variable optimization. Motor output torque, power density, and lower torque ripple are chosen as the optimization objectives. After the preliminary optimization, variables with greater influences to the objectives were selected for multi-variable optimization using genetic algorithms. The final finite element calculation results show that, comparing the proposed optimized design to the initial design, motor output torque and power density increased 5.8% and 15.6%, respectively, and torque ripple reduced 51.2%.

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Chiang, Hung-Hsing, and 江紘興. "On the Control of an Axial Flux Permanent Magnet Motor." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/qdn8q6.

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碩士 國立臺北科技大學 電機工程系研究所 100 In order to reduce acoustic noise and vibration yielded by six-step voltage control for PMSM with digital hall-effect sensor as rotor flux-position sensor, this thesis presents a rotor magnetic flux position detection method with three linear hall- effect sensors and validates the proposed method on an AFPM motor through torque and low speed control. The linear hall-effect sensors are installed in stator to detect the rotor flux of AFPM motor. Duo to the uneven distribution of rotor flux or inaccurate installed positions of sensor by hand, the output signals of linear hall-effect sensors may exist sub harmonics and harmonics of rotor speed to cause inaccurately measured rotor flux position. In order to get more accuracy of rotor flux position, elimination of harmonics and mitigation of variable peak values are proposed to let the output signals of linear hall-effect sensors be nearly three-phase balanced sinusoidal signal by software. Hence, the AFPM motor can be operated from standstill using vector control to improve the defect caused from six-step voltage controlled method. For cutting down cogging torque of AFPM motor, a simulated result of cogging torque is derived from JMAG first. Then, the simulated result will be confirmed and modified by actual test. Therefore, a cogging torque mitigation method based on look-up table is provided and validated by experimental results. Moreover, some low speed control tested results are carried out to show the effectiveness of the proposed cogging torque mitigation method. Finally, a DSP MS320F28035-based motor drive is built to verify the effectiveness of the proposed methods on an AFPM motor.

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Li, Ping-Lun, and 李秉倫. "Optimal Design of an Axial-Flux Brushless PM DC Motor." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/87744133770077666100.

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碩士 逢甲大學 電機工程所 95 The purpose of this thesis is to design a high performance axial-flux permanent magnet brushless machine (AFPM). First, an equivalent magnetic circuit model of the motor is derived by using the magnetic circuit theory and the parameters of the motor are calculated. Then, the performance of the AFPM is obtained. The finite element analysis software, Flux 3D is employed to obtain the performance of the machine. Finally, the Taguchi method is used to make robust design of AFPM and improve the performance. The optimized results provide higher electromagnetic torque and minimize the torque ripple. It is shown that the Taguchi method is a very efficient and effective approach in robust design a high performance AFPM.

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Chang, Che-Wei, and 張哲維. "Design and Analysis of a Hybrid Switched Reluctance Motor with Axial Flux and Radial Flux." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/89172855420294220390.

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碩士 國立交通大學 機械工程系所 102 Designing in-wheel motors for electric vehicles and hybrid electric vehicles has already attracted attention in recent years. The choice of motors for both electric vehicles and hybrids is generally determined by three factors: weight, efficiency and cost. Hence, the permanent magnet brushless motors that have the lightest weight and maximum efficiency are becoming the mainstream of electric vehicle drive systems nowadays. However, based on the cost of rare earth metals of the permanent magnet consideration in the future, reluctance motors without using rare earth metals have become interesting research topics. Switched reluctance motor (SRM) is gaining widespread interest as a candidate for electric and hybrid electric vehicle due to its simple structure, ruggedness, ability of fault-tolerance, extremely high-speed operation, high power density and low manufacturing cost. However, for vehicle applications, the disadvantages of SRM are the generation of acoustic, vibration and torque ripple. According to the literatures, the dominant source of acoustic noise and vibration are radial force produced by radial motor and axial force produced by axial motor. The unique salient pole structure of stator and rotor and nonlinear inductance contributes the higher torque ripple. This study establishes the computer-aided design process of SRM. By deriving the motor output equation and feasible triangle method, the size of SRM can be roughly decided. Then according to the analytical results of air gap permeance at aligned and unaligned position with equivalent magnetic analysis where the flux linkage curves at aligned and unaligned position can be obtained from. Furthermore, by finding out the product of current and turns which produces the maximum variation of co-energy determine the optimum current and turns. Finally, use the finite element method to verify the performance of motors. This study also proposed a novel SRM with axial and radial air gap to make the flux flow have both radial and axial directions. The motor is hence called hybrid flux SRM. The purpose is to increase the output torque and reduced acoustic and vibration problem. The rotor of HSRM is composed of radial and axial rotor pole to lower the radial and axial force for reducing acoustic noise and vibration. The stator of HSRM is constructed by several independent C-core stators. The features of this C-cores are wound individually and automatically without complex and expensive winding equipment, low production cost, more space of motor slot and better thermal dissipation. Based on the design process which has been already established, the HSRM is designed and implemented in this study. Finally, the performance of HSRM is compared with the traditional SRM and other motors.

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Wei-CheTai and 戴偉哲. "The Analysis and Design of a Axial Flux Arc Shape Motor." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/03596922491747497439.

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碩士 國立成功大學 航空太空工程學系碩博士班 100 The thesis considers the analysis and design of an Axial-Flux Permanent Magnet (AFPM) motor and its application to auxiliary power system for bikes. Owing to its thin type structure and high torque characteristic, it is convenient to implement the motor on a conventional bike and is able to provide the auxiliary power for the riders when it is needed.. The main design idea of the auxiliary motor is from the structure of a linear motor. The propelling force applied to the wheel is generated through the attraction and repulsion between the magnets. The rotor consisting of permanent magnets is equipped on the wheel and the stator is fixed on the frame of bike. The design specification of the motor is proposed according to the dynamic analysis for riding on the 5-degree slope and the characteristics of electric motor. The electromagnetic field analysis is carried out by the finite element based software Ansoft Maxwell. According to the numerical results of static and dynamic analysis, the motor parameters can be determined such that the design requirement is achieved. Dynamic simulations are provided to verify the performance of AFPM motor. Owing to the structure of the motor, the inductance is bigger and the response of current is slower than conventional motor. Therefore, the velocity of the bike when riding on the 5-degree slope is 8.5 (km/hr). It is lower than the usually expected speed.

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Ding, Fu-Xuan, and 丁富軒. "Optimal Design of Direct Drive Axial Flux Electric-Auxiliary Bicycle Motor." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/26114108726422767331.

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碩士 國立臺灣大學 機械工程學研究所 101 This thesis proposes a systematic process of a multi-objective optimal design of an axial-flux permanent-magnet synchronous motor (AFPMSM) for electric-auxiliary bicycles. The optimal design process uses a Quasi-3D analytical model of the magnetic field in an AFPMSM to calculate motor sizes under the same back-EMF factor target and phase resistance limit to achieve the specific motor torque-speed curve requirement. This model is derived from a one-dimensional analytical solution of the slotless air-gap flux density distribution and equivalent magnetic circuit model with an effective air-gap permeance distribution function to correct the flux distribution with the slot effect and flux leakage. In the search of the optimum motor sizes, the Compromise Programming is used to assess the set of motor parameters and make the performance indices, such as volume, mass, and efficiency, closest to all its best valuation on aggregate. The 3-dimensioanl finite element method (FEM) verifies and refines the final design, demonstrating that the proposed design process develops an axial-flux permanent-magnet motor with a high torque density for electric-auxiliary bicycles.

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Su, Yu-Hong, and 蘇育鴻. "Control of The Double-Sided Axial Flux Permanent Magnet Synchronous Motor." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/4b7t8s.

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碩士 國立臺北科技大學 電機工程系所 101 The main purpose of this thesis is to design the motor drive of double-sided AFPM, and analyze the differences of double-sided AFPM motor in series and parallel coil. Through increase DC-link voltage to control the series coil of double-sided AFPM motor. For the parallel coil mode, two sets of drive are used to the control. Finally, analyze the differences between series mode and parallel mode. Using high-resolution encoder can significantly improve the performance of AFPM motor’s control at low speed but the system cost will be increased. So, in this thesis presents a control method for low-resolution encoders can improve the performance effectively of AFPM motor in low speed. Through adjusting the size of the stator rotating magnetic field and the lead angle of the rotor flux to improve the control precision in low speed. The motor drive consist a dsp TMSF320F28035-based control stage and power stage, and some experimental results tested on a 1.1kW/2550rpm AFPM motor is carried out to verify the effectiveness of the proposed system.

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Liao, Shuo-Kun, and 廖碩鯤. "Optimal Performance Control of Axial-Flux Wheel Motor for Hybrid Electric Vehicles." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/10989186351664001025.

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碩士 國立臺灣大學 機械工程學研究所 94 The objective of this research is to improve the performance of axial-flux wheel motor. We attempt to scheme out a set of control strategy to maximize the driving torque, rated speed and efficiency. This optimal performance control strategy composes of three parts. First, the driving current waveform is proven to be the same as the back EMF to produce maximum torque. Second, the series and parallel connections of motor windings constitute various gears. The low speed or accelerating operation consumes larger current while the high speed or crusing mode needs higher voltage but less current. With appropriate electric gearshift on motor windings, one can fulfill these driving conditions. Last, the back EMF can be reduced by adjusting advanced conduction angle. Thus the motor operating region extends once again and leads to achieve constant-power operation. In this paper, the experimental data are obtained carefully as the result of design of experiments. Randomization and replication are adopted to average out the effects of extraneous factors and obtain an estimate of the experimental error. With the concept of statistics, the experimental results will be more accurate and reliable.

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Wei, Dou-Yan, and 魏道炎. "The Research of Driving Technology for AN Axial-flux Brushless DC wheel Motor." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/12303492727110725914.

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碩士 國立臺灣大學 機械工程學研究所 90 This thesis is proposed to discuss the optimal driving phase current waveform for an axial-flux brushless DC wheel motor. By the way of mathematical proving, numerical analysis, and experimentation, the optimal driving phase current waveform for brushless DC motor is its phase back EMF waveform was proved in this thesis. The relationship about alignment torque, phase current, and back EMF of DC brushless motor is derived by the motor torque equation. And then, expanding phase current and phase back EMF function proves that the motor has the maximum output torque when the phase current and the back EMF waveform are proportional. This is confirmed by the magnetic circuit analysis and the finite element analysis, and the phase back EMF waveform is considered in motor design process so as to obtain the maximum efficiency and the minimum torque ripple. Finally, three different phase current waveforms, the phase back EMF waveform extracted from experiments, the optimal driving current waveform designed by the 2D magnetic circuit model, and the traditional square waveform, were used with the same root mean square value in experiments to verify the conclusion in this thesis.

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Tsai, Ming-Hsiao, and 蔡名曉. "Optimal Design and Implementation of an Axial-Flux Hub Motor with Control Drive." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/86936097934269001704.

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碩士 高苑科技大學 電機工程研究所 98 The main purpose of this thesis is to develop a high-performance axis-flux permanent-magnet hub-motor and its driver for using at the electronic bicycle (E-bike). First, according to the dimension and the performance specifications of the hub-motor, using the basic theorem of magnetic circuit and back EMF of winding to assign the original geometric parameters of rotor and stator of hub-motor. Then, using the JMAG electromagnetic analysis software is as the hub-motor performance analysis platform and refining the original hub-motor to match the performance specifications, such as smaller volume and weight, higher torque while low-speed, and higher efficiency, etc. For obtaining the robust design of hub-motor with both high torque and high efficiency, a novel systematic and efficient approach, using the fuzzy-based Taguchi method with multiple performance characteristics index (MPCI) and the finite element method (FEM) are employed. First, according to the geometrical parameters of the hub-motor selects the controllable factors and their levels, such as magnet thickness, magnet area, air-gap width, and thickness of winding at stator. The proposed method will establish the orthogonal array (OA) that is recommended by the Taguchi method. Then, the multiple targets are coordinated by the fuzzy inference mechanism to obtain the better combination of the geometrical parameters for achieving multiple quality targets. In addition, a low-cost driver of E-bike based on N79E875 microcontroller chip is employed. N79E875 is a multi-functional MCU that is made by the NUVOTON Corporation. The MCU chip has many excellent features, such as fast computing ability, more I/O ports and four independent PWM duty control units, suits to apply in BLDC motor controlling. A low-cost driver of E-bike based on N79E875MCU is implemented successfully in this thesis. Finally, a thin and high-performance hub-motor and its driver have been implemented successfully. The thin hub-motor has many advantages, such as smaller volume, good performance and low manufacture cost. The driver can drive smoothly the hub-motor according to the speed order. The results are baled to apply in electric scooter and electric bicycle as their traction power system.

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Lin, Shih-Chao, and 林士超. "Optimal Operational Strategy Design of a Single-sided Permanent Magnet Axial-flux Motor." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/14845994542151766625.

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碩士 國立中山大學 電機工程學系研究所 92 This thesis presents a systematic scheme to determine the optimal propulsive/axial force ratio of a single-sided permanent magnet axial-flux motor (SPMAM) along with its operational constraints on both the winding currents and the speed induced voltages. According to the rotating magnetic field theory with combining the recoil line characteristics of permanent magnet and the equivalent operational magnetic circuits, appropriate projection of the stator currents to achieve an optimal ratio of the machine propulsive/axial forces has been confirmed through detailed three-dimensional finite element analysis (3-D FEA) and numerical studies. From these evaluations, a feasible operational guidance for SPMAM field oriented control (FOC) scheme realizations can be suitably provided. Finally, based on the proposed optimal scheme, a DSP-based drive system has been successfully implemented, and the desired operational strategy realization can be achieved.

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Yang, Fu-Tzuen, and 楊甫尊. "Implementation of PCB Stator Winding for Axial-Flux Motor in Electrical-Bike Application." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/22741680378464101877.

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碩士 國立交通大學 電控工程研究所 100 This thesis presents an analysis and discussion of the axial-flux motor used on electrical-bike and adopted a coreless design. Therefore, the stator winding fix by a special resin instead of traditional silicon steel. It causes the stator winding can’t be mass produced and have quality variations. In order to improve this problem, this thesis presents a design of the axial-flux motor used on electrical-bike with printed circuit board (PCB) stator winding to instead of copper wire in the same rotor flux distribution, including PCB stator winding design method, test experiment prototype setup and analysis of PCB stator winding prototype test results. By regarding the analysis of shape and position of permanent magnets, power density, torque constant and basic parameters to develop a better PCB stator winding layout. In motor test, the generation mode, measure the tri-phase back-emf to calculate and estimate the back-emf constant, total harmonic distortion (THD), flux distribution and motor *parameters. The results infer that the back-emf is similar to a sine wave and THD is about 7%. Then setup a control system with linear hall-effect sensors and sinusoidal PWM control strategy to drive this motor with a single PCB stator winding. By simulation and experiment to test and analyze the current response, motor performance, skin-effect and temperature, etc. The test and experiment results verifies the feasibility and performance of the axial-flux motor with PCB stator winding.

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Zheng, Ren-Kai, and 鄭仁凱. "Integrated Design of an Axial-Flux Brushless DC Motor with a Magnetic Coupling." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/42424162456141712466.

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碩士 國立雲林科技大學 機械工程系碩士班 99 Integrated design of an axial flux brushless motor with a magnetic coupling is a new design concept. Traditionally, axial flux brushless motor and magnetic coupling are independently designed and manufactured. Then, they are combined appropriately to meet needed drive requirements. This kind of design strategy, however, suffers from inherent disadvantages on more complex power transmission link, transmission components easier to wear and tear, and incompact work space arrangements. This study is to Combined into one integrated device-based mechanical and electrical by integrated design of an axial flux brushless motor with a magnetic coupling, First, introduction axial flux brushless motor with axial magnetic coupling characteristics of the structure and driving principle, and propose two new design concept of integration, The first program is permanent magnet of the motor rotor and permanent magnet of the magnetic coupling design for shared components, the second program is permanent magnet of the motor rotor and permanent magnets of the magnetic coupling attached to the magnetic yoke. Next, the equivalent magnetic circuit method is presented to determine the main dimensions of the axial flux brushless motor and magnetic coupling, while the validity is verified by the finite element analysis (FEA). Finally, the detail design of the proposed integrated device is presented. Based on the results of FEA, the integrated design case one have lower electromagnetic torque, but the torque ripple is reduced form 45.21% to 44.93%, and the integrated design case two although the torque ripple is too high, but its output torque is only slightly decreased 14.50 %.

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Chuang, Down-Xu, and 莊璫旭. "Optimal Design of Axial-flux Permanent Magnet In-Wheel Motor for Electric Vehicle." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/31598490456063332709.

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碩士 國立臺灣大學 機械工程學研究所 92 Axial-flux permanent magnet motors have the advantages of high torque and high torque density and high efficiency. Before the design of electric vehicle, it is necessary to know the requirement of it. The requirement should be include at least the maximum torque, the maximum speed and the rated power for propulsion. The performance of the motor would set to the constraint of the optimal design. The first topic of this thesis is using energy method to establish the simplified torque equation, and the voltage equation is used to calculate the other performances of the motor. At the constraint of finite space and geometry, the optimal theory can help to find the best performance by changes of design variable. The Multi-Object System Tool (MOST) is used to make Optimization possible. The Optimal results are investigated by 3D Finite-Element Analysis (FEMA) Electromagnetic analysis software. According to the results of 3D FEMA Electromagnetic, some detail geometry can be modified without changing the optimal results to achieve better performance, like lightening weight and minimizing the torque ripple of the motor. The second topic of this thesis is to use this optimal design process to design high torque output, high speed, high efficiency and light weight motor for electric vehicle.

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Chin, Haw-Jong, and 金浩中. "Design and Implementation of an Axial Flux Permanent Magnet Motor for Light Electric Vehicle." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/azb947.

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碩士 國立臺北科技大學 電機工程系研究所 99 In recent years, the axial flux permanent magnetic motor has become the propulsion system of high-end light electric vehicles due to its high efficiency, better heat dissipation, simple transmission structure and easy cascaded connection to expend the power capacity. In this study, the specifications of the AFPM motor are determined first according to the requirements of LEV, such as power, limitations of weight and volume and installed position. Then, the flux density, output torque and efficiency are calculated to decide whether or not these parameters can be in reasonable range. When finishing the mechanical design of the AFPM motor, the electrical and magnetic parameters are carefully designed and confirmed using the 3D FEM analysis software JMAG. In order to distinguish the difference between 3d FEM design values and measured results, the stator is manufactured by non-continuous mold pressing. Before assembling the motor, all the mechanical parts are carefully measured to make sure that all the major dimensions are within in the acceptable tolerance. Finally, the electrical parameters are measured and a motor drive is added to verify loading effect of the AFPM motor. The tested results show that the AFPM motor meets the predetermined specifications.

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Huang, Yuh-Shyuan, and 黃郁琁. "Design of Double-Sided Axial Flux Permanent Magnet Synchronous Motor for Light Electric Vehicle." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/mkca4r.

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碩士 國立臺北科技大學 電機工程系所 101 The purpose of this research is to design a high efficiency double-sided axial flux permanent magnet (AFPM) synchronous motor for light electric vehicle, which has two AFPM motors in serial connection. This design focuses on larger power and less cogging torque. Moreover, using the suitable winding connection as well as the driver to promote the AFPM motor’s efficiency at light load and half load, which also be extremely helpful to whole system reliability, as one of the motors is inactive. The key issues of this research are listed as followed. 1.Build a simulation model with suitable parameters in JMAG to verify the calculated results by 3D FEM. Determine the shifted angle to provide the smallest cogging torque by calculation. 2.Motor mechanism design takes account of the structure analysis and easy to experiment. 3.Discussing the difference between two AFPM motors in serial connection from winding structure and driving method for the performance. Finally, the electrical parameters are measured and a motor drive is added to verify loading effect of the AFPM motor. The tested results show that the AFPM motor meets the predetermined specifications.

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LEE, CHI-MING, and 李吉明. "The Design of Optimal Current Waveform for An Axial-Flux Brushless Permanent-Magnet Wheel Motor." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/61419050498234448538.

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碩士 國立臺灣大學 機械工程學研究所 88 Direct-driven wheel motor is one of the solutions to increase the efficiency of electric vehicles, especially, at low speed with required large torque. This paper aims to the design of the optimal current waveform for an axial-flux brushless permanent magnet motor, so that its output torque is maximized under prescribed constraints. First, the torque equation is derived by he energy method and modified according to the characteristics of the wheel motor. Second, the parameters that describe the relationship between torque and input current are introduced in the magnetic circuit model. Three different sets of constraints are then prescribed for various driving and winding structures. Finally, the optimal current waveform for independent winding with constrained copper loss is proved to be best in terms of maximum efficiency and output torque.

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Wong, Wun-Siane, and 翁文賢. "Analysis and Control of a Single-side Permanentmagnet Axial-flux Motor with Aluminum Stator Core." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/c9f242.

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碩士 國立中山大學 電機工程學系研究所 95 This thesis presents a systematic scheme to design the propulsive force and axial force control of a single-sided permanent-magnet axial-flux motor with aluminum stator core (SPAMA) through the detailed mathematical model and operational analysis. According to the rotating magnetic field theory combining with the recoil line characteristics of permanent magnet and the magnetic equivalent circuit, appropriate projection of the stator currents to achieve the propulsive force and axial force control can be realized. From these evaluations, a feasible operational guidance for SPAMA field oriented control (FOC) framework can be successfully developed. Finally, based on our system model and simulation results, the steady-stay characteristics of the machine can be observed.

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Chuang, Hao-Cheng, and 莊皓程. "Design of Axial-Flux Sensorless Six-Phase Brushless Permanent Magnet Motor for Cogging Torque Reduction." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/58915445890858075375.

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碩士 國立臺灣海洋大學 系統工程暨造船學系 104 Permanent magnet brushless DC motors can be widely applied in drive systems of industrial and electronic products due to the advantages of high power density and high torque density. There is 46% of power consumption which resulting from the motor and other related equipment. As long as the price of rare earth material raises rapidly, the motor design with low rare earth usage and maintaining power density and output power under restricted resource become an important research issue. The thesis focuses on cogging torque reduction design of a slim axial-flux sensorless six-phase brushless permanent magnet motor with low rare earth material. Using C-shaped laminated slot structure in the stator with double air-gap structure and surface structure with notched design on both the stator and the rotor and C-shaped laminated slot structure are presented in this study to accomplish the goal of cogging torque reduction. Adopting finite element analysis simulation software, ANSYS Maxwell, The simulation results are provided to verify the magnetic force line between the permanent magnets and the stators which can be modified by using the C-shaped laminated slot structure design shows the magnetic flux linkage arranging inside the stator for reducing cogging torque. Confirming the design is correct and then preparing for a prototype. The optimal cogging torque reduction percentage in simulation results with the C-shaped laminated slot structure and permanent magnet rotor utilizing surface structure design is up to 34.4%. The reduction percentage of permanent magnet rotor volume is 4.5%. Because of the decreasing volume of permanent magnet rotor, the output torque and the air gap flux decrease 12% and 11.3%, respectively.

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Chiang, Tsung-shiun, and 江宗訓. "Three-dimensional Force Analyses of an Axial-flow Radial-flux Permanent Magnet Motor with Magnetic Suspension." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/70892473446416033505.

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碩士 國立中山大學 電機工程學系研究所 92 This thesis provides a detailed field analysis of a specially designed axial-flow radial-flux permanent magnet motor for cooling fan applications. By implementing an iron strip segment at the stator base, this motor can provide a stable guidance force in its axial direction, such that the operational vibration effects can be minimized and the undesired forces applied onto associated bearing system can be alleviated. Supported by adaptive magnetic equivalent circuit and three-dimensional finite element analyses, the motor operational fluxes and forces can be analyzed. Results show that excellent performance and enhanced reliability objectives can all be achieved.

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Lan, I.-Wei, and 藍亦維. "Design Method for Improving Torque Density of Axial-Flux Permanent Magnet Motor in Personal Lightweight Electric Vehicle." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/47354592628003782308.

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碩士 國立臺灣大學 機械工程學研究所 99 Nowadays, there are many different vehicles in this world, bike, scooter, car, train, MRT system …etc. These kinds of vehicle almost cover user’s requirement. There is a new kind of vehicle called PLEV, personal lightweight electric vehicle, and it provides an easy means for the last-mile service. PLEV is foldable and portable EV. It has direct drive motor and lightweight structure. EV traction motors always reach torque command as power requirement. Higher torque command means more motor weight and volume, and it decrease battery performance in same vehicle space. It would be more consider in PLEV, because motor weight percent in vehicle is larger. The purpose of this research is to design a high torque density axial-flux motor which is lightweight and suitable for a PLEV. This research proposes a design method with software tools for improving torque density of axial-flux motor. The method is proposed that magnetic design to increase torque density and structure design to decrease motor structure weight. In this research, FEM software JMAG and ABAQUS are used to analysis magnetic and structure design. This research is also proposed motor design program to shorten design period. There are two points in this research. One is to finish motor parametric operation program to decrease magnet design period. That can also reduce design variables of sensitive analysis. Another is use ESO (evolution structure optimum) to analysis motor structure. After above, this research proposes PLEV motor, doing test and verify it to show research achievement.

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Lee, Shih-Chia, and 李世家. "Analysis and Field Oriented Control of a Single-sided Permanent-magnet Axial-flux Motor with Center Pole." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/51995509603199628272.

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碩士 國立中山大學 電機工程學系研究所 93 This thesis presents a systematic scheme to design the optimal efficiency operations and axial force control of a single-sided permanent-magnet axial-flux motor with center pole (SPAMC) through the detailed mathematical model and operational analysis. According to the rotating magnetic field theory combining with the recoil line characteristics of permanent magnet and the magnetic equivalent circuit, appropriate projection of the stator currents to achieve the optimal efficiency operations and axial force control can be realized. From these evaluations, a feasible operational guidance for SPAMC field oriented control (FOC) framework can be successfully developed. Finally, based on the proposed operational scheme, a DSP-based drive system has been successfully implemented, and the optimal efficiency operations and axial force control objectives can be achieved.

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Dissertations / Theses on the topic 'Axial flux motor'

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