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1
Cipín, Radoslav. „Matematické modely transformátorů a asynchronních motorů“. Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2008. http://www.nusl.cz/ntk/nusl-217586.
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The fist part of this work is dealt with the construction of the mathematical models of voltage and current transformers. There are created and simulated models of voltage and current transformer with the nonlinear magnetization characteristics. The second part of this work is dealt with equivalent circuit of the induction motor in the form of Gamma-circuit. The speed-torque characteristic and the dependence of stator current on the slip are calculated from this equivalent circuit. The third part of this work is dealt with electromagnetic design of the alternating current machines by the help of a classic way and a new way.
2
Hundák, Vladimír. „Algoritmy pro řízení asynchronního motoru“. Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-220893.
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Hlavným cieľom tejto práce je vytvorenie simulácií rôznych algoritmov riadenia asynchrónneho motora a vzájomné porovnanie ich vlastností. Zaoberá sa taktiež možnosťami konfigurácie náhradného zapojenia na T-článok, -článok a -článok. Obsahuje jednak teoretický rozbor, a taktiež aj simulácie jednotlivých spôsobov riadenia spolu s podrobným návodom na ich realizáciu. Celkovo budú vykonané 3 simulácie – simulácia vektorového riadenia s orientáciou na rotorový tok, vektorového riadenia s orientáciou na statorový tok a simulácia takzvaného prirodzeného riadenia. Ide o úplne nový typ riadenia, ktorého autorom je vedúci tejto diplomovej práce. Jeho simulácia bola vôbec prvým pokusom o funkčnú realizáciu tohto typu riadenia.
3
Babu, Hareesh. „Finite-element analysis of an induction motor with inter-turn short-circuit faults“. Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-290082.
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Stator inter-turn short circuit (ITSC) faults are one of the common sources for induction machine failure affecting their reliable operation. In this thesis, a finite element (FE) model is developed to study the ITSC fault. The FE model is developed for a prototype induction machine that has the potential to emulate an ITSC fault in the stator. With the developed FE model of the prototype machine, a simulation study is performed to understand the behaviour of various electrical and magnetic quantities in time- and frequency-domain. The investigated quantities are potentially good signatures of the stator winding faults and they are therefore suitable to use in a condition monitoring system. The prototype machine with ITSC faults has been tested in an experimental setup and the results are compared to the simulation and also to analytical results. For the fault current it was found a good agreement between analytical results, FE simulations and experimental results. Moreover, the FE simulation results of the negative-sequence stator current amplitude present a minor mismatch with the analytical and experimental results. The reason for this mismatch is due to an inaccurate knowledge of the prototype machine geometrical parameters.Kortslutning mellan varven i en asynkronmotors statorlindning (ITSC) är en av de vanligaste källorna för fel som påverkar dess drifttillförlitlighet. I detta examensarbete utvecklas en finit-element (FE) modell för att studera ITSC- fel. FE-modellen är utvecklad för en asynkronmotorprototyp som kan emulera ITSC-fel. Med den utvecklade modellen utförs en simuleringsstudie för att förstå beteendet hos olika elektriska och magnetiska egenskaper både i tids- och frekvensdomän. Dessa egenskaper är goda indikatorer av statorlindningsfel och kan därför med fördel användas i ett tillståndsövervakningssystem. Prototypmaskinen har testats experimentellt och de erhållna resultaten jämförs med FE-simuleringen och analysresultaten. Det analytiska resultatet, FEM- simuleringarna och den experimentella utvärderingen uppvisade god överrensstämmelse vad gäller felströmmen. Dock finns det en mindre avvikelse när det gäller amplituden hos statorströmmens negativa fasföljd. Orsaken till denna avvikelse är att prototypmaskinens geometri inte är helt känd.
4
Wilow, Viktor. „Electromagnetical model of an induction motor in COMSOL Multiphysics“. Thesis, KTH, Elektrisk energiomvandling, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-160703.
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Ansys, Flux or COMSOL are examples of software-tools that can be used to study magnetic noise, caused by magnetic forces in the air-gap, in induction motors. The project team wanted to use COMSOL in this thesis. The electromagnetical domain needs to be coupled to the mechanical domain to complete the study. The air-gap forces, calculated in the electromagnetical model using the Rotating Machinery module, can be exported to the Acoustic-Solid Interaction module in COMSOL to enable the vibro-acoustic analysis. An electromagnetical model of an induction motor is developed in two-dimensions in the finite element method based software-tool COMSOL Multiphysics in this thesis. Simulation results obtained in the frequency domain are compared with results achieved in the software-tool FEMM. Simulation results of the phase inductance, distribution of the flux density and the torque are compared. The simulated torque in COMSOL is validated with the torque derived based on an equivalent lumped model of the induction motor. A time-dependent simulation of the motor is made at 4.7% slip and 1A (peak) supply. The obtained torque is 0.33Nm. The same value is achieved in the frequency study in COMSOL. The corresponding value is 0.003Nm higher in FEMM. The evaluated air-gap forces at 4.7% slip can be used for studying vibro-acoustics in COMSOL.Ansys, Flux eller COMSOL är exempel på datorprogram som kan användas för att studera magnetiskt brus, orsakad av magnetiska krafter i luftgapet, i induktionsmotorer. Projektgruppen ville använda COMSOL i det här examensarbetet. För att kunna utföra studien måste den elektromagnetiska domänen kopplas till den mekaniska domänen. Luftgapskrafterna, beräknade i den elektromagnetiska modellen genom att använda modulen för roterande maskiner, kan exporteras till modulen Acoustic-Solid Interaction för att möjliggöra den vibro-akustiska analysen. En elektromagnetisk modell av en induktionsmotor är utvecklad i två dimensioner i finita elementmetoden-baserade programvaran COMSOL Multiphysics i det här examensarbetet. Simuleringsresultat från frekvensdomänen jämförs med resultat som uppnås med datorprogramvaran FEMM. Simuleringsresultat för fas-induktansen, fördelningen av flödestätheten och momentet jämförs. Det simulerade momentet i COMSOL valideras med momentet som härleds utifrån induktionsmotorns motsvarande ekvivalenta schema. En tidsberoende motor-simulering genomförs vid 4.7% slip, matad med 1A (topp-värde). Det erhållna momentet är 0.33Nm. Samma värde erhålls i frekvensstudien i COMSOL. Värdet är 0.003Nm högre i FEMM. De beräknade luftgapskrafterna vid 4.7% slip kan användas för att göra en vibroakustisk studie i COMSOL.
5
Zbede, Yaman. „Model predictive MRAS estimator for sensorless induction motor drives“. Thesis, University of Newcastle upon Tyne, 2017. http://hdl.handle.net/10443/3771.
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The project presents a novel model predictive reference adaptive system (MRAS) speed observer for sensorless induction motor drives applications. The proposed observer is based on the finite control set-model predictive control principle. The rotor position is calculated using a search-based optimization algorithm which ensures a minimum speed tuning error signal at each sampling period. This eliminates the need for a proportional integral (PI) controller which is conventionally employed in the adaption mechanism of MRAS observers. Extensive simulation and experimental tests have been carried out to evaluate the performance of the proposed observer. Both the simulation and the experimental results show improved performance of the MRAS scheme in both open and closed-loop sensorless modes of operation at low speeds and with different loading conditions including regeneration. The proposed scheme also improves the system robustness against motor parameter variations and increases the maximum bandwidth of the speed loop controller. However, some of the experimental results show oscillations in the estimated rotor speed, especially at light loading conditions. Furthermore, due to the use of the voltage equation in the reference model, the scheme remains sensitive, to a certain extent, to the variations in the machine parameters. Therefore, to reduce rotor speed oscillations at light loading conditions, an adaptive filter is employed in the speed extraction mechanism, where an adaptation mechanism is proposed to adapt the filter time constant depending on the dynamic state of the system. Furthermore, a voltage compensating method is employed in the reference model of the MP-MRAS observer to address the problems associated with sensitivity to motor parameter variation. The performance of the proposed scheme is evaluated both experimentally and by simulation. Results confirm the effectiveness of the proposed scheme for sensorless speed control of IM drives.
6
Roberts, D. „The application of an induction motor thermal model to motor protection and other functions“. Thesis, University of Liverpool, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.380092.
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Roberts, David. „The application of an induction motor thermal model to motor protection and other functions“. Online version, 1986. http://ethos.bl.uk/OrderDetails.do?did=1&uin=uk.bl.ethos.380092.
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8
SOARES, GEORGE ALVES. „INDUCTION MOTOR VELOCITY BY SUBSYNCHRONOUS CASCADE AND 6TH ORDER MODEL“. PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1988. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=9841@1.
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O controle de velocidade do motor de indução do rotor
bobinado, através de uma cascata de conversores
estáticos
no rotor, conhecido como Sistema Kramer Estático, é
considerado um dos melhores acionamentos para motores
acima de 500 Hp, devido às suas características de baixo
custo inicial, menor complexidade do sistema de
conversores e regeneração de energia.
Nestas últimas décadas, as pesquisas nesta área se
concentraram basicamente na melhoria da estrutura dos
conversores estáticos, o projeto de controle recebeu
pouca
atenção e sua estrutura de controle continuava inspirada
no controle do motor de corrente contínua. Em um recente
trabalho (1987) foi proposto um controlador PI com
realimantação proporcional de corrente no elo c.c. .
Contudo, este projeto, como os outros, foram baseados em
uma modelagem simples.
Nesta dissertação de mestrado, revê-se e critica-se
modelagens e projetos de controle existentes, desenvolve-
se um modelo de 6ª ordem e propõe-se um projeto de
controle que atente às especificações usuais de
controle.
A estrutura proposta é composta de um regulador de
estado
mais um observador parcial de estado. Esta estrutura é
fisicamente realizável e o seu algoritmo de projeto é
simples, claro e direto. Comprova-se que o uso de
modelos
mais completos e estruturas de controle mais eficazes
não
implicam em controladores complexos e irrealizáveis.The speed control of wound rotor induction motor by a static converter cascade (Kramer Static System) is considered one of the best large motor drive (above 500 Hp.) due to its characteristics of low initial cost, less complexity of the converters and energy regeneration. In the last decades, the researches emphasize basicilly the improvement of the converter structure. The control design was almost forgotten and its structure was Kept based on the direct current motor control. In 1987, it was proposed a PI controller with proportional feedback of direct current. But, this last design, like the others, was based on a simple model. In this dissertation, the modellings and control designs are reviewed and criticized. Besides this, a sixth order model is developed and a new control design is proposed in order to solve the usual control requirements. This proposed structure is composed of a state regulator plus a partial state observer. It´s also of easy achievement and its design algolirhm is simple, easy and direct. It´s confirmed that the use of morepowerful control structure doesn´t implacate in complex and unfeasible controller.
9
Lange, Martin T. „INFLUENCE OF VOLTAGE SOURCE PULSE WIDTH MODULATED SWITCHING AND INDUCTION MOTOR CIRCUIT ON HARMONIC CURRENT CONTENT“. Wright State University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=wright1230942161.
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10
Halfar, Tomáš. „Zlepšení energetických parametrů asynchronních strojů malého výkonu“. Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2013. http://www.nusl.cz/ntk/nusl-219929.
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The master’s thesis Improvement power parameter of small induction motors deals with issues of lowering the losses of small induction motors. The first part introduces with design and principles of operation of induction motors. Also introduces to theoretical problematic of losses, their lowering and measuring. In the practical part there are results of the measuring the losses in the induction motor ATAS Elektromotory Náchod a.s. T22VT512 (71-0512). There are proposed methods of increasing the efficiency of induction motor due to measuring and their verification in the Maxwell software. The last part is dedicated to measuring the losses of prototype motor from ATAS and comparison of results with previous motor.
11
Suciu, Constantin. „Switch mode emulation of large value capacitors in the rotor circuit to improve the induction motor performance“. Thesis, Nottingham Trent University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.314331.
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12
Maduike, E. V. „Models of large induction motors for stability studies of industrial power systems“. Thesis, University of Strathclyde, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.382346.
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13
Bawana, Niyem Mawenbe. „Thermal Response in a Field Oriented Controlled Three-phase Induction Motor“. Scholar Commons, 2019. https://scholarcommons.usf.edu/etd/7740.
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The research conducted at the department of Electrical Engineering of the University of South Florida campus in Tampa only covers the electrical aspect of electric drives. However, the performance of electric machinery is significantly impacted by temperature variation. The
literature review shows three main control techniques in use today in electric drives namely, Scalar control, Direct Torque control and Field Oriented control.
This thesis presents a temperature rise of rotor bars, stator winding, stator core and stator frame in a running three phase field-oriented controlled induction machine. A literature search shows that none of research has been carried out to investigate a thermal response of a field-oriented controlled induction motor. With this motivation, we were able to implement a lumped parameters thermal model of a three-phase field-oriented IM in MATLAB Simulink, which allows us to determine that rotor bars have the highest temperatures rising to 84 degrees Celsius. This confirms that rotors bars are the hottest part of a running IM as stipulated in literature.
14
Hu, Yifei. „Linear Induction Motor Investigation and Design for Articulated Funiculator“. Thesis, KTH, Elektrisk energiomvandling, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-177816.
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Articulated Funiculator is a new and innovative concept developed by Tyréns forachieving a more efficient vertical transportation with a higher space utilization.Having a variety of merits, i.e.: simple construction, direct electromagneticthrust propulsion, and high safety and reliability in contrast to rotary inductionmotor, linear induction motor (LIM) is considered to be one of the cases as thepropulsion system for Articulated Funiculator. The thesis is then carried outwith the purpose of determining the feasibility of this study case by designing theLIMs meeting some specific requirements. The detailed requirements include: aset of identical LIMs are required to jointly produce the thrust that is sufficientto vertically raise the moving system up to 2 m/s2; the size of the LIMs cannotexceed the specification of the funiculator; the maximum flux density in the airgap for each LIM is kept slightly below 0.6 T; no iron saturation of any part ofthe LIMs is allowed.In this thesis report, an introduction of LIM is firstly presented. Followingthe introduction, relevant literature has been reviewed for a strengthenedtheoretical fundamentals and a better understanding of LIM’s history and applications. A general classification of LIMs is subsequently introduced. In addtion,an analytical model of the single-sided linear induction motor (SLIM) has beenbuilt based on an approximate equivalent circuit, and the preliminary geometryof the SLIM is thereby obtained. In order to acquire a more comprehensiveunderstanding of the machine characteristics and a more precise SLIM design, atwo-dimensional finite element method (2D-FEM) analysis is performed initiallyaccording to the preliminary geometry. The results, unfortunately, turn out tobe iron severely saturated in the teeth and yoke, and a excessive maximumvalue of air-gap flux density. Specific to the problems, different parameters ofthe SLIM are marginally adjusted and a series of design scenarios are run inFlux2D for 8-pole and 6-pole SLIM. The comparisons between the results areconducted and the final solution is lastly chosen among them.Articulated Funiculator är ett nytt och innovativt koncept som utvecklats av Tyréns för att möjilggöra en mer effektiv vertikal transport och bättre utnyttjautrymme. Tack vare fördelar såsom en enkel konstruktion, direkt elektromagnetiskdragkraftsframdrivning, samt hög säkerhet och tillförlitlighet i motsatstill roterande induktionsmotor, är en linjär induktionsmotor (LIM) aktuell somframdrivningssystem. Detta examensarbete är utfört med syfte att utforma enLIM för att uppfylla vissa specifika krav. De detaljerade kraven inkluderar: enuppsättning identiska LIM krävs för att gemensamt producera tillräcklig dragkraftför att vertikalt höja det rörliga systemet upp till 2 m/s2; storleken påLIM får inte överstiga specifikation; den maximala flödestätheten i luftgapet förvarje LIM hålls är begränsad till knappt 0.6 T; ingen järnmättnad av någon delav LIM är tillåtet. I denna rapport ges först en introduktion av LIM-konceptet. Efter introduktionenhar relevant litteratur granskats för att stärka teoretiska grundkunskapersamt ge en bättre belysning av historiken kring LIMs samt dess applikationer. Utöver detta har en analytisk modell av den ensidiga linjära induktionsmotorn(SLIM) byggts, baserat på en ungefärlig ekvivalent krets med vilket den preliminärageometrin för SLIM. För att erhålla en mer grundläggande förståelse avmaskinens egenskaper är en tvådimensionell analys med finita elementmetoden(2D-FEM) utförd, initialt med användande av en preliminär geometri erhållenmed hjälp av analytisk dimensionering. Resultaten från dessa simuleringar visadedock att järnet mättats kraftigt i både tänderna och oket och ett överdrivetstort maximivärde av luftgapets flödestäthet erhålls. Specifikt för applikationenjusteras olika parametrar och en rad driftscenarier körs i Flux2D för en 8-poligoch en 6-polig SLIM. En slutgiltig jämförelse mellan de olika maskindesignernapresenteras och den rekommenderade lösningen väljs slutligen.
15
Oliveira, Ãtila GirÃo de. „Neural classifier aplied in stator winding inter-turn short circuit in three-phase induction motors driven by frequency converter“. Universidade Federal do CearÃ, 2014. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=12285.
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CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel SuperiorThis dissertation reports applications of artificial neural networks to detect stator winding interturn fault of three phase induction motor drived by frequency inverter. The artificial neural networks, like Simple and Multilayer Perceptron, served as off-line classifiers to short-circuit fault condition or healthy condition. In the training of Multilayer Perceptron, two different algorithms are used: the error back-propagation, which is a classic algorithm, and the extreme learning machine, as a relative new alternative for the classic back-propagation. The new one is more worthwhile because of its implementation easiness and higher speed of computation. The database used on the training and validation of the networks is created from an experimental setting, therefore it is composed by true data. The attributes used as failuresâ indicators are selected from certain frequencies of the spectrum, based on some theories of current signature analysis. In the second instance, the technique of principal components analysis is employed. The results obtained for the designed classifiers are shown, and some considerations are made on their use in real time embedded applications, which is the most important projection for future researches.
Este trabalho deriva da aplicaÃÃo de redes neurais artificiais para a detecÃÃo de curto-circuito entre espiras em motor de induÃÃo trifÃsico, acionado por inversor de frequÃncia. As redes neurais artificiais, do tipo Perceptron Simples e Multicamadas, sÃo usadas para detectar falhas de curto-circuito no bobinamento estatÃrico de motores de induÃÃo trifÃsicos de forma off-line. Para treinamento do Perceptron Multicamadas sÃo usados dois algoritmos distintos: o error back-propagation, que figura como o algoritmo clÃssico na literatura especializada, e o extreme learning machine, que à uma alternativa, relativamente recente, ao algoritmo clÃssico. Este algoritmo à uma opÃÃo atraente para o desenvolvimento rÃpido de classificadores. O banco de dados usado para treinamento e validaÃÃo das redes à obtido a partir de experimentaÃÃo laboratorial, portanto composto de dados reais. Os atributos utilizados para a detecÃÃo da falha sÃo componentes de frequÃncia do espectro harmÃnico da corrente estatÃrica do motor. O critÃrio de escolha destas componentes, a priori, à fundamentado em resultados de investigaÃÃes prÃvias da assinatura de corrente e, em segunda instÃncia, à aplicada a tÃcnica de anÃlise de componentes principais. SÃo apresentados os resultados obtidospelos classificadores projetados, e feitas algumas consideraÃÃes quanto à utilizaÃÃo destes em aplicaÃÃo embarcada e em tempo real, que à a principal projeÃÃo de futuros trabalhos a partir do atual.
16
Roggio, Luca. „Reduction of a Detailed Thermal Model Lumped Parameters Approach for an OSV Induction Motor“. Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-253197.
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This thesis work is dealing with a detailed thermal model for an open self ventilated inductionmachine with lumped parameters approach. The model is entirely built using as referencespublished articles. The thermal network is tested using both MATLAB for calculating theparameters and SimScape for simulations and validation. Thermal resistances and capacitiesare fully depending on the geometry and material of the analysed motor, although the use ofCFD simulation results has been needed to model accurately the speed of the air circulatingin the inner part of the motor. Using results from the temperature rise test performed onthe OSV motor, the LP model is validated and subsequently an attempt of reduction ofthe model's order decreased the number of nodes from 78 to 24 with a reasonable loss ofaccuracy. During the reduction, a sensitivity analysis of the axial partition number and allthe resistances is presented. The goal of the model is to be suitable for control operation, hencethe inputs of the model are the duty cycle rotor speed and losses, copper iron and friction, astime variant arrays. The outputs are instead the temperature during the simulation time ofsensitive targets such as end windings, inner hotspot windings, rotor bars and bearings.Detta examensarbete behandlar en detaljerad, lumped-parameter baserad, termisk modell aven öppen, självventilerad asynkronmaskin. Den framtagna modellen är helt baserad på tidigare framtaget publicerat material. Det termiska nätverket är utvärderat med hjälp av Matlab (för att beräkna modellparametrar) och Simscape (för att utföra själva simuleringen samt tillhörande validering). De termiska resistanserna och kapacitanserna beror på geometri – och materialparameter kompletterat med parametrar framtagna med hjälp av CFD-simuleringar för att representera det termiska utbytet pga. den cirkulerande luften i maskinens kylkanaler och axiella ändar. Den framtagna modellen har validerats mot temperaturmätningar från ett experimentellt test. Efter detta har försök att reducera den framtagna modellens komplexited genom att minska antalet noder från 78 till 24 utan att felet I predikterade temperaturerökat signifikant. Målet med den reducerade modellen är att kunna implementera den I en regleralgoritm och dess indata är därför duty cycle, rotorvarvtal och förluster. Utdata från ren reducerade modellen är temperaturer på känsliga motordetaljer såsom ändlindningar, maximal temperaturer I statorspåren, rotorledarnas temperatur samt lagertemperaturer.
17
Abboud, Mohamad Moulham. „Simulation of 3ph induction motor in Matlab with Direct and Soft starting methods“. Thesis, Linnéuniversitetet, Institutionen för fysik och elektroteknik (IFE), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-45888.
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Asynchronous machines are considered nowadays the most commonly used electrical machines, which are mainly used as electrical induction motors. Starting the induction motor is the most important and dangerous step. The theory behind this project is based on representing the real motor by a set of equations and values in Matlab using the subsystem feature, forming a corresponding idealistic motor in a way where all the physical effects are similar. The motor is started under different loads in two methods: Direct and Soft starting. Each method is studied and discussed using supporting simulation of currents, torque, speed, efficiency and power factor curves.
18
Jasim, Omar. „An extended induction motor model for investigation of faulted machines and fault tolerant variable speed drives“. Thesis, University of Nottingham, 2010. http://eprints.nottingham.ac.uk/11285/.
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High performance variable speed induction motor drives have been commercially available for industrial applications for many years. More recently they have been proposed for applications such as hybrid automotive drives, and some pump applications on more electric aircraft. These applications will require the drive to operate in the presence of faults i.e. they must be “Fault Tolerant” and be capable of “Fault Ride Through”. The aim of this project was therefore to investigate fault ride through control strategies for induction motor drives, particularly with respect to open circuit winding or power converter faults. Three objectives were identified and addressed to meet this aim. a) A new simulation model for an induction motor was created which reflects both saturation and space harmonics effects within the drive under both symmetric (healthy) and asymmetric (faulted) conditions. The model has a relatively low computational requirement to allow it to be used in conjunction with the simulation of high performance control algorithms and power electronic equipment. For operation in both healthy and faulty conditions, comparisons show that the simulated saturation and space harmonic effects match those obtained from an experiment system. Therefore this model is a very useful tool for the development and optimisation of new control strategies for fault tolerant drive systems. b) A novel on-line fault detection and diagnosis algorithm based on the measurement of the third harmonic component in the motor line currents has been proposed. The location of the open circuit fault is detected based on detecting a magnitude reduction for the third harmonic component of the current flowing to the motor terminals, and can be implemented in real time to give a fast response with little additional computational overhead. c) A new open circuit fault tolerant control strategy has been designed for a delta connected induction machine suddenly affected by an open circuit winding fault. The fault ride through is achieved without any modification to either the power converter or the motor circuit. A novel feedforward compensation algorithm is introduced which considerably reduces the current and the torque ripple in the faulted drive motor. Two methods for controlling the neutral point voltage are also presented so that the available voltage capacity of the inverter is maximised in both normal and fault mode. For high speed operation, two different methods for field weakening control are presented, so that the available voltage capacity is maximized in both normal and fault mode. This thesis describes the theoretical derivation of the new models and algorithms, and presents experimental results from a 4kW laboratory prototype to validate the proposals. The full fault tolerant system is experimentally demonstrated on a delta connected machine which suffers an open circuit winding fault. The improved motor performance under fault conditions is clearly seen.
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Abboud, Mohamad Moulham. „Simulation of 3ph induction motor in Matlab with VVVF starting method“. Thesis, Högskolan i Halmstad, Energivetenskap, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-31102.
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Nowadays, three-phase induction motors are widely used on industrial and other types of processes. Therefore, accurate knowledge of an induction motor performance is very essential to have an idea of its operation conditions. This study is a sequel of a previous one, where Direct and Soft starting methods of three-phase motors has been simulated and compared. As in the previous study, the theory behind this one is based on representing the real motor by aset of equations and values in Matlab, forming a corresponding idealistic motor in a way where all the physical effects are similar. The motor is started under three different frequencies in the VVVF method using supporting simulation of the current, torque, speed,efficiency and power factor curves. The results of the three starting methods are then discussed and compared.Numera är tre-fas asynkronmotorer i stor utsträckning på industriella och andra typer av processer. Därför är det mycket viktigt att ha exakt kunskap om en induktionsmotorprestanda för att ha en uppfattning om dess driftsförhållanden . Denna studie är en fortsättning av en tidigare, där direkt och mjukstart metoder för trefasmotorer har simulerats och jämförts. Såsom i den tidigare studien, är teorin bakom denna en baserat på representerar den verkligamotorn av en uppsättning ekvationer och värden i Matlab, som bildar en motsvarande ideell motor på ett sätt där alla de fysiska effekterna är likartade . Motorn startas under tre olika frekvenser i VVVF metod med stöd simulering av ström, vridmoment, hastighet, effektivitetoch effektfaktorn kurvor. Därefter, resultaten av de tre startmetoder diskuteras och jämföras.
في الوقت الحالي تستخدم المحركات التحريضية ثلاثية الطور بشكل واسع في التطبيقات الصناعية و غيرها. و لهذا فإن المعرفة الدقيقة بأداء المحرك التحريضي أساسية لإعطاء فكرة عن ظروف تشغيله. إن هذه الدراسة هي تتمة لدراسة سابقة حيث تمت محاكاة و مقارنة طريقتي الإقلاع المباشر و الناعم للمحرك التحريضي ثلاثي الطور. كما في الدراسة السابقة, فإن هذه الدراسة مبنية على تمثيل المحرك الحقيقي بمجموعة من المعادلات و القيم الاسمية في برنامج ماتلاب لتكوين محرك مثالي مطابق, بحيث تكون جميع الآثار الفيزيائية مماثلة للمحرك الحقيقي. يتم إقلاع المحرك عند ثلاث ترددات مختلفة بطريقة تغيير التردد و التوتر و يتم محاكاة هذا الإقلاع عبر منحنيات التيار، العزم، السرعة، المردود و عامل الاستطاعة ثم تقارن نتائج طرق الإقلاع الثلاثة.
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Hagio, Shota. „Muscle synergy for coordinating redundant motor system“. Kyoto University, 2016. http://hdl.handle.net/2433/215620.
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Kyoto University (京都大学)0048
新制・課程博士
博士(人間・環境学)
甲第19794号
人博第765号
新制||人||184(附属図書館)
27||人博||765(吉田南総合図書館)
32830
京都大学大学院人間・環境学研究科共生人間学専攻
(主査)教授 神﨑 素樹, 教授 森谷 敏夫, 教授 石原 昭彦
学位規則第4条第1項該当
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Gao, Zhi. „Sensorless Stator Winding Temperature Estimation for Induction Machines“. Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/13966.
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The organic materials used for stator winding insulation are subject to deterioration from thermal, electrical, and mechanical stresses. Stator winding insulation breakdown due to excessive thermal stress is one of the major causes of electric machine failures; therefore, prevention of such a failure is crucial for increasing machine reliability and minimizing financial loss due to motor failure.
This work focuses on the development of an efficient and reliable stator winding temperature estimation scheme for small to medium size mains-fed induction machines. The motivation for the stator winding temperature estimation is to develop a sensorless temperature monitoring scheme and provide an accurate temperature estimate that is capable of responding to the changes in the motors cooling capability. A discussion on the two major types of temperature estimation techniques, thermal model-based and parameter-based temperature techniques, reveals that neither method can protect motors without sacrificing the estimation accuracy or motor performance.
Based on the evaluation of the advantages and disadvantages of these two types of temperature estimation techniques, a new online stator winding temperature estimation scheme for small to medium size mains-fed induction machines is proposed in this work. The new stator winding temperature estimation scheme is based on a hybrid thermal model. By correlating the rotor temperature with the stator temperature, the hybrid thermal model unifies the thermal model-based and the parameter-based temperature estimation techniques. Experimental results validate the proposed scheme for stator winding temperature monitoring. The entire algorithm is fast, efficient and reliable, making it suitable for implementation in real time stator winding temperature monitoring.
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Lawal, Isa Usman. „Effectiveness of a Structured Circuit Class therapy model in stroke rehabilitation: A single blind randomized controlled trial“. University of the Western Cape, 2016. http://hdl.handle.net/11394/6285.
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Philosophiae Doctor - PhD (Physiotherapy)Stroke is a debilitating medical and neurological condition. It is the leading cause of adult disability worldwide. Disability from stroke covers the three key classifications of the WHO-ICF framework on human function centred on health and health related issues, implying that the disability in stroke involve structural and activity limitations to participation restriction. Rehabilitation remains the hallmark of managing the plethora of neurological deficits accompanying stroke. Currently, the key advocacy in neuroscientific studies for stroke rehabilitation is that therapy should be directed towards task specificity. Task Specific Training most recently, the form of Circuit Class Therapy and the intensity of multiple repetition of the task has been identified as physiological mechanisms behind sustained motor learning following stroke.Circuit Class Therapy (CCT) is a form of Task Specific Training (TST) that involves the practice of structuring tasks in a circuit or series of workstations. It offers the patient the ability to practice multiple tasks in a conducive environmental because of its three key features of utilisation of different workstations that allow people to practice intensively in a meaningful and progressive way to suit their respective needs; the efficient utilisation of therapists'/trainees' time; and the group dynamics such as peer support and social support. Although these features are attainable following CCT challenges remain in selecting the most efficient intensity that could produce these benefits in stroke survivors. This study investigated the effectiveness of differing intensities of CCT in the rehabilitation of stroke survivors using the ICF framework to guide patients� response assessments after training.
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Treviso, Felipe. „Estudo de um atuador planar de indução para a inspeção de superfícies metálicas“. reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2016. http://hdl.handle.net/10183/141822.
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Um atuador planar de indução é um dispositivo baseado no mesmo princípio de funcionamento de um motor linear de indução, onde a interação de um campo magnético viajante produzido pelo primário do dispositivo com uma superfície de boa condutividade elétrica induz correntes parasitas que levam à produção de uma força de propulsão. O movimento planar sobre essa superfície é produzido através da movimentação linear em dois eixos ortogonais. Uma aplicação deste movimento é na propulsão de uma plataforma equipada com câmeras e sensores para a realização da inspeção em uma superfície metálica, que se beneficiaria da força normal que o motor planar de indução produz quando acionado sobre uma superfície ferromagnética para anexar a plataforma à superfície. Um modelo analítico que fornece equações para o campo elétrico e magnético é apresentado, e simulações numéricas baseadas no método dos elementos finitos são realizadas para avaliar o comportamento do dispositivo utilizando três tipos diferentes de superfícies como secundário: um secundário com duas camadas formadas por uma chapa de alumínio com outra de aço por baixo; apenas a chapa de alumínio; e apenas a chapa de aço. As distribuições de campo magnético calculadas por estes dois modelos teóricos mostram boa concordância entre si, e são utilizadas para calcular as forças de propulsão e normal produzidas pelo atuador. Medidas experimentais são realizadas em um protótipo de atuador planar de indução, e seus resultados são comparados com os resultados obtidos nos modelos teóricos, mostrando uma boa concordância e potencial para a aplicação do atuador planar de indução na inspeção de superfícies horizontais.An induction planar actuator is a device that, based on the operating principle of a linear induction motor, in which the interaction between a travelling magnetic field produced by the primary of the device and a conducting surface generates eddy currents in the surface and leads to the generation of a thrust force. The device produces planar motion over this surface through movement on two orthogonal axis. An application of this movement is in a platform for the inspection of metallic surfaces, which is driven by the planar induction motor and equipped with cameras and sensors to inspect the surface. This application benefits from the normal force produced by the induction planar actuator operating over a ferromagnetic surface to attach the driving platform to it. An analytical model with equations for the electric and magnetic fields is presented, and numerical simulations based on the finite element method are carried out to assess the behaviour of the device using three different surfaces as secondary: a double-layered secondary formed by an aluminum plate over a steel plate; a aluminum only plate; and a single steel plate. The distributions for the magnetic field computed through these theoretical models show good agreement, and are employed to evaluate the thrust and normal forces produced by the planar induction actuator. Experimental measurements are made on a prototype of the device, and the results are compared to the results of the theoretical models, showing good agreement and potential in the application of the induction planar motor for the inspection of horizontal metallic surfaces.
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Kubenka, Marek. „Model synchronního motoru s permanentními magnety se ztrátami“. Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219035.
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This master´s thesis deals with permanent magnet synchronous motor, which is part of hybrid system of Toyota Prius. You can find study of this motor in program FEMM in this thesis. Model of equivalent magnetic circuit and magnetic flux density are part of this work. There is also information about core losses.
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Rolle, Bernhard [Verfasser]. „Model Predictive Energy Management for Induction Motor Drives and All-Wheel-Drive Battery Electric Vehicles : A Flatness Based Approach / Bernhard Rolle“. Düren : Shaker, 2021. http://d-nb.info/1233547828/34.
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Toman, Marek. „Vázané modelování asynchronního motoru metodou fyzikálního modelování“. Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231093.
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This paper deals with interaction of different physical phenomena in asynchronous motor. The first part of this work is devoted to computing of electrical ratios in asynchronous motor. By using the equivalent circuit in the shape of Gamma-circuit the equation for computing of currents, performances and losses of asynchronous motor are derived. The second part describes calculating of electromagnetic circuit and iron-core losses. In the next part there is the first part of associated model created which respects electric and electromagnetic ratios in the asynchronous motor. This model can be used for example to pursuance of variation of flux density caused by resizing load. In this model the unconventional way of computing the magnetizating inductance and resistance coresponding to iron-core losses is used. The next part deals with calculation of machine warming using the thermal network. In the last part there is a complete coupled model assembed which respects the interaction of electrical, electromagnetical and thermal ratios of induction machine.
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Szekeres, Vojtech. „Optimalizace tvaru drážky asynchronního motoru“. Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2016. http://www.nusl.cz/ntk/nusl-242019.
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This thesis is dealing with optimization by using artificial intelligence of an induction machine rotor slot. The one optimized is commonly manufactured induction motor with simple deep bar rotor. Goal is to design an optimization method and achieve the highest possible value of efficiency and power factor of chosen machine. Work contains the parametric model construction in Ansys Maxwell software, the optimization algorithm assembly and its setup for desirable output, and processing of the results.
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Rolle, Bernhard [Verfasser], und Oliver [Akademischer Betreuer] Sawodny. „Model predictive energy management for induction motor drives and all-wheel-drive battery electric vehicles : a flatness based approach / Bernhard Rolle ; Betreuer: Oliver Sawodny“. Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2021. http://d-nb.info/123272792X/34.
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Binek, Martin. „Optimalizace magnetického obvodu klasického asynchronního motoru při napájecí frekvenci do 210 Hz“. Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2019. http://www.nusl.cz/ntk/nusl-399567.
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This master’s thesis first deals with the theory concerning induction motor. It briefly desbribes the construction of three-phase induction motors, the generation of tractive force, power flow with loss distribution and also torque characteristic. In the next part an analytical calculation of the parameters of equivalent circuit for an existing induction motor with known dimensions is performed. After the calculation it is possible to find out the rated parameters of the motor, which makes it possible to further compare results with the values obtained by other methods. The next step was to create a model of the motor in RMxprt program, which is later also translated to ANSYS Maxwell 2D model. Simulations were carried out in both interfaces. As the next step the results obtained by the three methods are compared with measured values and also evaluated. The final part of the thesis focuses on the optimization of the magnetic circuit for higher frequencies. Efficiency of the modified induction motor is examined for higher frequencies using RMxprt Optimetrics and this procedure is performed for both default and alternative electrical steel materials.
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Pešek, Michal. „Výpočet parametrů asynchronního motoru metodou konečných prvků“. Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219181.
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This project is focused on finite element method, for purposes of asynchronous motor modeling. Program FEMM is used here, which works with two-dimensional models. The model is based on an existing motor. Then was conducted a series of simulations that are used to calculate the parameters of the circuit model. Then was measured the existing asynchronous motor and performed the calculation of the circuit model parameters of the motor. Compared with data obtained from motor and models Then was compared their torque characteristics. Moments was identified at certain slip frequencies and voltage or current in circuit model.
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Santana, Eudemario Souza de. „Algoritmo preditivo baseado em modelo aplicado ao controle de velocidade do motor de indução“. [s.n.], 2007. http://repositorio.unicamp.br/jspui/handle/REPOSIP/260709.
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Orientador: Edson BimTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação
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Resumo: Esta tese trata do emprego do controle preditivo baseado no modelo (MBPC-Model Based Predictive Control) no acionamento do motor de indução do trifásico, para controle de fluxo de rotor e velocidade. A estratégia MBPC baseia-se na minimização do erro entre as referências futuras e a predição do modelo, para gerar os sinais de controle. Nesta tese, o motor de indução é descrito por espaço de estados e, diferentemente, do MBPC não linear, que emprega algoritmos de busca para determinar os sinais de controle, a estratégia escolhida faz inearizações sucessivas. Assim sendo, a cada ciclo gera-se a lei de controle, sendo que esta é dada por uma equação algébrica. São necessários ao controlador preditivo o conhecimento das tensões de terminal do estator e das seguintes variáveis de estado: corrente de estator, fluxo de rotor e velocidade de eixo. Para a estimação dos estados é empregado o filtro de Kalman estendido. O torque de carga é tratato como uma perturbação e sua magnitude é obtida por duas abordagens: pela equação eletromecânica e pelo filtro de Kalman estendido. Resultados de simulação computacional e experimentais validam a proposta
Abstract: This thesis presents the results concerning the control of rotor flux and speed of the induction motor using MBPC strategy, which is based on the error minimization between the future set point and model prediction, resulting in control signals. In the case studied in this thesis the motor model is described in space-state. The non linear MBPC emploies search algorithms to find the control signals, whereas the technique used in this thesis made sucessives linearizations on model; therefore in every control cicle a new algebraic control lay is found. The predictive control needs to know the stator voltage and the following state variables: stator current, rotor flux and speed. In the order to estimate the states an extended Kalman filter is employed. The load torque is considered as a disturbance and its amplitude is obtained in two ways: by calculation via eletromechanical equation and by estimation via Kalman filter. The proposal has been validated by imulations and experiments
Doutorado
Energia Eletrica
Doutor em Engenharia Elétrica
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Svetlík, Martin. „Dynamický model synchronního stroje s využitím magnetických ekvivalentních obvodů“. Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219176.
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The thesis focuses on constructing dynamic model - synchronous generator with using magnetic equivalent circuit diagrams. The model construction is based on knowledge of geometric parameters, magnetic characteristic of used material and fyzical deployment of vindings placed in stator slots. Computed reults are compared with results optained from model created with finite element method.
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Záškodný, Jiří. „Model víceotáčkového motoru a simulace v programu ANSYS Maxwell“. Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2018. http://www.nusl.cz/ntk/nusl-377332.
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This master thesis deals with calculations and simulations of multi-speed induction motors. In the first part, basic principle of these machines is described. Next, there are given three examples of pole-changing stator windings and their properties are analyzed (winding factors, magnetomotive force). Main part includes simulations and measuring of the specific motor, which is produced by company Siemens Mohelnice. This is the motor with 2/1 pole-changing in Y/YY connection. First, influence of skewed rotor slots on current and torque is analyzed. Next, parametres of motor from simulations are given and these results are compared to measured values.
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Petrovas, Andrius. „TRIFAZIŲ ASINCHRONINIŲ VARIKLIŲ DINAMINIAI MODELIAI“. Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2007. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2007~D_20070629.143203-98148.
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Disertacijoje siekiamas tikslas: sudaryti trifazio asinchroninio variklio matematinius modelius fazinėje koordinačių sistemoje, esant įvairiems variklio apvijų jungimo būdams, sukurti modelį tiesiaeigio asinchroninio variklio dinamikos tyrimui, jo pagrindu sudaryti kompiuterinius modelius dažniu valdomiems asinchroniniams varikliams tirti.The aim of dissertation is to develop mathematical and computer models of induction motor in phase coordinate system at various ways of stator windings connection, transform this model for investigation of dynamics of linear induction motor, and carry out computer models for investigation of frequency-controlled induction motors.
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Reis, Aderson Jamier Santos. „Reconhecimento de padr?es de falhas em motores trif?sicos utilizando redes neurais“. Universidade Federal do Rio Grande do Norte, 2010. http://repositorio.ufrn.br:8080/jspui/handle/123456789/15341.
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Previous issue date: 2010-02-19This work presents a diagnosis faults system (rotor, stator, and contamination) of three-phase induction motor through equivalent circuit parameters and using techniques patterns recognition. The technology fault diagnostics in engines are evolving and becoming increasingly important in the field of electrical machinery. The neural networks have the ability to classify non-linear relationships between signals through the patterns identification of signals related. It is carried out induction motor?s simulations through the program Matlab R & Simulink R , and produced some faults from modifications in the equivalent circuit parameters. A system is implemented with multiples classifying neural network two neural networks to receive these results and, after well-trained, to accomplish the identification of fault?s pattern
Este trabalho apresenta um sistema de diagn?stico de falhas (rotor, estator e contamina??o) do motor de indu??o trif?sico atrav?s dos par?metros do circuito equivalente e utilizando t?cnicas de reconhecimento de padr?es. A tecnologia de detec??o de falhas em motores est? evoluindo e tornando cada vez mais importante na ?rea de m?quinas el?tricas. As redes neurais possuem a habilidade de classificar rela??es n?o lineares entre sinais atrav?s da identifica??o de padr?es dos sinais relacionados. S?o realizados simula??es do motor de indu??o atrav?s do programa Matlab R & Simulink R e produzido alguns tipos de falhas no conjunto a partir de modifica??es nos par?metros do circuito equivalente. ? implementado um sistema com m?ltiplos classificadores neurais para receber estes resultados e, ap?s o treinamento, realizar a identifica??o dos padr?es de falhas
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Cavalca, Eduardo Bonci. „Avaliação de abordagens de controle preditivo aplicadas em um motor de indução trifásico“. Universidade do Estado de Santa Catarina, 2013. http://tede.udesc.br/handle/handle/2077.
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Previous issue date: 2013-07-12Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Model-based predictive control (MPC) approaches has been studied in a wide range of areas, as petrochemical and aerospace, mainly due to its capability of easily deal with physical and operational constraints. Moreover, such approaches can be extended for the application in control loops with nonlinear and time-variant systems. At this context, the objective of this work is to study some MPC techniques in order to evaluate their applicability to control a three-phase induction motor. More specifically, it was analyzed a Dynamic Matrix Control (DMC) approach, as well as two MPC techniques that uses state space modeling. The control algorithms in question and the nonlinear mathematical model of the motor in study were programmed using the free computing environment Scilab-Xcos®. The models of the threephase motor used in the MPC were obtained by a system identification method (based on the step response of the classical non-linear motor model) and by a phenomenological three-phase modeling approach. Multiple simulations have been performed considering variations in load and speed reference. Besides, some discussions are made related to the influence of the control parameters and about the computational cost. Finally, the results showed that the use of MPC techniques in induction machines has great potential.
Abordagens de controle preditivo baseado em modelo (MPC, do inglês model-based predictive control) têm sido estudadas em diversas áreas, como petroquímica e aeroespacial, principalmente devido à capacidade que apresentam em tratar restrições físicas e operacionais de forma simples. Além disso, tais abordagens podem ser estendidas para aplicação em malhas de controle de sistema não lineares e variantes no tempo. Nesse contexto o objetivo desse trabalho é estudar algumas técnicas de MPC a fim de avaliar sua aplicabilidade no controle de um motor de indução trifásico. Mais especificamente, é analisada a técnica DMC (do inglês Dynamic Matrix Control) bem como duas técnicas de MPC que utilizam modelos no espaço de estados. Os algoritmos de controle em questão e o modelo matemático não linear do motor estudado foram programados utilizando o Scilab-Xcos®, um ambiente de processamento de código livre. Os modelos do motor de indução trifásico utilizados no MPC foram obtidos por meio de um método de identificação de sistemas (baseado na resposta ao degrau do modelo clássico não linear do motor) e por uma abordagem de modelagem fenomenológica trifásica. Múltiplas simulações foram realizadas, considerando variações de carga e referência de velocidade, sendo então apresentadas algumas discussões sobre a influência dos parâmetros de controle e custo computacional. Finalmente, os resultados obtidos demonstraram que a aplicação de técnicas MPC em máquinas de indução apresenta um grande potencial.
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Bin, Hasan M. M. A. „Current based condition monitoring of electromechanical systems : model-free drive system current monitoring : faults detection and diagnosis through statistical features extraction and support vector machines classification“. Thesis, University of Bradford, 2012. http://hdl.handle.net/10454/5732.
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A non-invasive, on-line method for detection of mechanical (rotor, bearings eccentricity) and stator winding faults in a 3-phase induction motors from observation of motor line current supply input. The main aim is to avoid the consequence of unexpected failure of critical equipment which results in extended process shutdown, costly machinery repair, and health and safety problems. This thesis looks into the possibility of utilizing machine learning techniques in the field of condition monitoring of electromechanical systems. Induction motors are chosen as an example for such application. Electrical motors play a vital role in our everyday life. Induction motors are kept in operation through monitoring its condition in a continuous manner in order to minimise their off times. The author proposes a model free sensor-less monitoring system, where the only monitored signal is the input to the induction motor. The thesis considers different methods available in literature for condition monitoring of induction motors and adopts a simple solution that is based on monitoring of the motor current. The method proposed use the feature extraction and Support Vector Machines (SVM) to set the limits for healthy and faulty data based on the statistical methods. After an extensive overview of the related literature and studies, the motor which is the virtual sensor in the drive system is analysed by considering its construction and principle of operation. The mathematical model of the motor is used for analysing the system. This is followed by laboratory testing of healthy motors and comparing their output signals with those of the same motors after being intentionally failed, concluding with the development of a full monitoring system. Finally, a monitoring system is proposed that can detect the presence of a fault in the monitored machine and diagnose the fault type and severity
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Aldahan, Leith, und Ivan Kudoori. „Utvärdering av roterande borstlösfrekvensomformare tillspårledningar“. Thesis, KTH, Hälsoinformatik och logistik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-252801.
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Spårledningar används inom tunnelbanan för att visa tågets position samt bestämma tågets hastighet genom att bryta spänningsamplituden i signalen vid olika frekvenser. Frekvensen till spårledningen fås från en roterande frekvensomformare. I dagens anläggning används roterande frekvensomformare med borstar. Dessa avger i relärum mycket värme och ger miljöproblem i form av koldamm från borstarna. Det befintliga systemet är gammal och har funnits i drift över 30 år, därför håller reservdelar på att ta slut samt service till systemet svårtillgängligt. Detta examensarbete har undersökt möjligheten att uppgradera till nyare system som bygger på en lösning med roterande borstlös frekvensomformare där reservdelarna och service är tillgängliga i minst 25 år. Undersökningen jämför olika roterande borstlösa frekvensomformare från olika leverantörer för att hitta en frekvensomformare där kraven från Trafikförvaltningen uppfylls. Studien har haft fokus på problemområdet med borstade frekvensomformaren som producerar skadliga ämnen såsom koldamm och värmen i relärum. Diskussioner med tillverkningsföretag av roterande borstlös frekvensomformaren har skett under denna studies gång där möjliga alternativ för vidare utveckling av systemet i relärum analyseras. I projektet har även diskuterat möjligheten att använda det nya systemet av frekvensomformare med borstlösa motor och generator istället för den nuvarande borstade frekvensomformaren som finns i anläggningen. Resultatet har även visat att den roterande borstlösa frekvensomformaren kan omvandla frekvensen till 75 Hz. Det nya systemet uppfyller kraven från Trafikförvaltningen samt att systemet håller i minst 25 år till. Att systemet håller minst i 25 år till var ett stort krav av Trafikförvaltningen som uppfylldes under denna studie.Track lines are used in subway stations to show the train locations and determine the speed of the train by chopping the frequency. The frequency of the track lines is obtained from a rotary frequency converter. In today's stations, rotary frequency converters with brushes are commonly used. These emit a great deal of heat in some relays and produce environmental problems in the form of carbon dust from the brushes. The existing systems have been used for over 30 years and obtaining spare parts and conducting maintenance on the systems can be difficult. This degree project examines the possibility of newer systems being built on a rotating brushless frequency converter, where the spare parts and servicing would be available for at least the next 25 years. The project surveys and compares different rotating brushless frequency converters from different suppliers to find an identical frequency converter to meet the requirements of the Traffic Administration. The result of this study has had a lot of focus on the problem area with the brushed frequency converter that produces harmful substances such as carbon dust and the heat in the relay room. Discussions with manufacturing companies of rotating brushless frequency converters have been made during this study where possible options were discussed for further development of the system in relay rooms. The result has also discussed the possibilities of using the new system of frequency converters with brushless motor and generator instead of the current brushed frequency converter available in the facility. The result has also shown that the rotating brushless frequency converter can convert the frequency to 75 Hz. The new system meets RAMS requirements of the Trafikförvaltning, and the system lasts for at least 25 years. This was a major requirement of the Trafikförvaltning, which was fulfilled during this study.
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Painter, Palak Rajeshkumar. „Quantitative analysis of glycinergic neurons including Ia inhibitory interneurons in the ventral spinal cord using a BAC-GlyT2-eGFP transgenic mouse model“. Wright State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=wright1347911464.
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Dejan, Reljić. „Otkrivanje kvara rotora kaveznog asinhronog motora primenom tehnika analize terminalnih veličina“. Phd thesis, Univerzitet u Novom Sadu, Fakultet tehničkih nauka u Novom Sadu, 2017. https://www.cris.uns.ac.rs/record.jsf?recordId=104840&source=NDLTD&language=en.
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U disertaciji je predložena metoda za pouzdano otkrivanje kvara rotoratrofaznog kaveznog asinhronog motora. Metoda je zasnovana naidentifikaciji obeležja kvara rotora iz signala terminalnih veličinajednofazno napojenog trofaznog kaveznog motora u stacionarnom stanjupogona. Predložena metoda eliminiše potrebu za postojanja opterećenjamotora, što je osnovna prednost u odnosu na rešenja iz literature. Svateorijska razmatranja su praćena odgovarajućim rezultatima računarskihsimulacija, da bi se potom sprovela eksperimentalna verifikacija ipotvrdila efikasnost predložene metode. Takođe, predstavljen jepostupak za kvantitativnu procenu oštećenja štapnih provodnika rotora.In this Doctoral dissertation, a novel method for broken rotor bar fault detectionin a three-phase squirrel-cage induction motor (IM) is introduced. The proposedmethod is non-invasive and it is based on the analysis of the IM terminalquantities in a single-phase steady-state operating condition. Compared toconventional fault detection techniques, the developed method does not requireany loading on the motor, which is the main benefit of the method. The faultycondition of broken rotor bars was investigated analytically, while theeffectiveness of the proposed method was proven by the variety of computersimulations and experimental results. Based on these results, a methodology forthe quantification of broken rotor bars in the IM has been presented.
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Koníček, Pavel. „Diagnostika vibrací elektromagnetického původu v asynchronním motoru“. Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-220713.
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The aim of this master´s thesis is to introduce methods of diagnostics of vibrations in electrical machines. Describe the various vibration sources located inside and outside of the electric machine. Description of the sources of vibration is then preferably dedicated to vibration of electromagnetic origin. There is a description of the construction of an asynchronous motor and the magnetic circuit, the theory of vibrations and their origin. Described are also vibration sensor enables measurement and mathematical tools for their evaluation. In this work also practical vibration measurements on an asynchronous motor, data processing, their subsequent analysis and computer simulation of electromagnetic vibration origin. The conclusion of this work is devoted to the evaluation of the data obtained.
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Cipín, Radoslav. „Moderní matematické metody syntézy a analýzy střídavých strojů“. Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2012. http://www.nusl.cz/ntk/nusl-233566.
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The doctoral thesis is divided into three main parts with a focus on induction motors. The first part deals with the electromagnetic design and analysis of windings of AC ma-chines. There is introduced the density of conductors, which describes the distribution of the windings in the slots. There is derived general formula for calculation of the total winding factor applicable to any type of winding. The second part of this work deals with the acceleration method of the induction motors torque-speed characteristics measurement. The measured characteristics are used for exact identification of the equivalent circuit parameters of induction motor. The third section is focused on a very precise identification of the equivalent circuit parameters of induction motor in the form of -circuit. The identification is based on mutual comparison of measured and calculated torque-speed and current-speed characteristics.
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Chvatík, Štěpán. „Asynchronní motor s vnějším rotorem“. Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2018. http://www.nusl.cz/ntk/nusl-377075.
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Lu, Bin. „Energy Usage Evaluation and Condition Monitoring for Electric Machines using Wireless Sensor Networks“. Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/14152.
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Energy usage evaluation and condition monitoring for electric machines are important in industry for overall energy savings. Traditionally these functions are realized only for large motors in wired systems formed by communication cables and various types of sensors. The unique characteristics of the wireless sensor networks (WSN) make them the ideal wireless structure for low-cost energy management in industrial plants.
This work focuses on developing nonintrusive motor-efficiency-estimation methods, which are essential in the wireless motor-energy-management systems in a WSN architecture that is capable of improving overall energy savings in U.S. industry.
This work starts with an investigation of existing motor-efficiency-evaluation methods. Based on the findings, a general approach of developing nonintrusive efficiency-estimation methods is proposed, incorporating sensorless rotor-speed detection, stator-resistance estimation, and loss estimation techniques. Following this approach, two new methods are proposed for estimating the efficiencies of in-service induction motors, using air-gap torque estimation and a modified induction motor equivalent circuit, respectively. The experimental results show that both methods achieve accurate efficiency estimates within ¡À2-3% errors under normal load conditions, using only a few cycles of input voltages and currents. The analytical results obtained from error analysis agree well with the experimental results.
Using the proposed efficiency-estimation methods, a closed-loop motor-energy-management scheme for industrial plants with a WSN architecture is proposed. Besides the energy-usage-evaluation algorithms, this scheme also incorporates various sensorless current-based motor-condition-monitoring algorithms. A uniform data interface is defined to seamlessly integrate these energy-evaluation and condition-monitoring algorithms. Prototype wireless sensor devices are designed and implemented to satisfy the specific needs of motor energy management. A WSN test bed is implemented. The applicability of the proposed scheme is validated from the experimental results using multiple motors with different physical configurations under various load conditions. To demonstrate the validity of the measured and estimated motor efficiencies in the experiments presented in this work, an in-depth error analysis on motor efficiency measurement and estimation is conducted, using maximum error estimation, worst-case error estimation, and realistic error estimation techniques. The conclusions, contributions, and recommendations are summarized at the end.
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Horálek, Lukáš. „Výpočet chlazení asynchronního stroje pomocí programu Ansys CFX“. Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2017. http://www.nusl.cz/ntk/nusl-318176.
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The issue this master’s thesis discusses the cooling synchronous machines. Specifically, the calculation of cooling induction motor using the finite volume method. Using Autodesk Inventor will create a 3D model of a real electric machine, ie asynchronous motor and then ANSYS WORKBENCH perform system analysis CFX, based on the finite volume method. Furthermore, we realize the air speed measurements on a particular machine and the individual results obtained by measuring and calculating the actual compared with each other. The master’s thesis also deals marginally with closely related to it. For the same machine model, we apply the calculation of the temperature fields using the finite volume method and them perform a thermal analysis. Next, we can carry out the measurement of the temperature on the motor itself and calculate the measured values and the measured compare each other.
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Sadauskas, Tomas. „Tiesiaeigio asinchroninio variklio magnetinio lauko imitacija“. Master's thesis, Lithuanian Academic Libraries Network (LABT), 2006. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2006~D_20060623_095632-82775.
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In this thesis is investigated how magnetic field varies at different instants of time in the air gap of linear induction motor and outside of it. The are given results of simulation, which show the change of magnetic flux at different instants of time of linear induction motor in the air gap, outside the inductors, also magnetic flux dependencies on air gap width. Two models of linear induction motor with secondary element and without it are compared.
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Andreux, Raphaël. „Modélisation et optimisation des démarreurs à inducteur bobiné pour l'application "stop-start" ou micro-hybride“. Thesis, Université de Lorraine, 2013. http://www.theses.fr/2013LORR0088/document.
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La machine à collecteur mécanique reste, dans de nombreuses applications, une alternative crédible par rapport aux autres types de moteurs électriques. Dans le domaine automobile, ce sont les coûts de fabrication et surtout la fiabilité dû à l'absence d'électronique de puissance qui rendent cette solution si intéressante. Cela est également son point faible : l'absence de dispositif de régulation fragilise l'électronique de bord en cas d'appel de courant trop important au démarrage. L'usure du système balai-collecteur est également un point clé pour un démarreur d'autant plus que, pour assurer un fonctionnement « Stop-Start » en plus du fonctionnement traditionnel, le nouveau cahier des charges impose jusqu'à 450 000 cycles de démarrage (contre 30 000 auparavant). Ceci justifie la recherche actuelle sur ces dispositifs. En effet, une partie importante de cette thèse traite de la modélisation et de la mesure de la commutation dans le démarreur pour mieux évaluer les phénomènes qui y interagissent. L'arc électrique en fin de commutation joue un rôle important dans l'usure du système balais-collecteur. Une meilleure connaissance des facteurs influents permet, par la suite, de concevoir des appareils plus robustes. Dans une deuxième partie de la thèse, on s'intéresse au dimensionnement optimal d'un démarreur. Après avoir passé en revue les différentes méthodes d'optimisation pour traiter un tel problème et avoir sélectionné les plus adaptées, on traite un cas pratique de dimensionnement optimal. Cette problématique est fondamentale pour Valeo au vue des quantités d'appareils fabriqués et des futurs marchés offerts par le développement du « micro-hybride » qui se généraliseNowadays, brushed DC motors are still used in many applications. In automotive industry, manufacturing cost and reliability are the two most important key indicators. That's why DC motors are preferred to others solutions requiring power electronics supply. But, there are also some drawbacks ; when the inrush current occurs (when the power-contact is switched on) the DC voltage of the battery decrease and can damage electronic components of the car. The wear of the brush-segments system is also a key issue for the life time of the starter. The new specifications for a « Stop-Start » starter use lead to a significant increase of the number of re-start cycles to be done by the device. We consider that a car achieve more than 450000 stop-and-start cycles during its lifetime whereas this number is only 30000 for the standard vehicles. These specifications justify the research work lead by Valeo on such device. An important part of the thesis concerns the modeling and the measurement of the commutation phenomena. The electric arc occurring at the brush trailing edges (when the physical contact ends) causes the wear of the brush-commutator system. A better knowledge of influent factors can lead to more robust device development. In a second part, we study the optimal design of a car starter regarding specifications. After a review of different optimization methods for dealing with such a problem, we select the most relevant ones and solve different practical problem around the starter. This issue is very important regarding the quantities of device manufactured and the market of micro-hybrid which is growing up very fast
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Mitka, Darius. „Roboto valdymo sistema“. Master's thesis, Lithuanian Academic Libraries Network (LABT), 2004. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2004~D_20040621_172148-76217.
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The final work of master studies reviews various industrial robots constructions and parameters, from which they are characterized. Robotics systems and control of flexible production have been discussed in here. Various robots’ drives and their control advantages and disadvantages are analyzed. In the practical part original robot global movement platform is suggested and algorithm of two flexible production bays handling is created. Static characteristics of linear drive used in platform are calculated. Using software package “Matlab Simulink” model of symmetrical linear induction motor (LIM) is created and dynamic characteristics are gained. Concluding part presents inferences and suggestions.
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Bidouche, Badr-El-Boudour. „Étude et réalisation d’une machine asynchrone basse vitesse à réducteur magnétique intégré“. Electronic Thesis or Diss., Université de Lorraine, 2019. http://www.theses.fr/2019LORR0228.
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Nous nous proposons dans ce travail d’étudier un entrainement par moteur à induction à rotor bobiné intégrant un réducteur de vitesse magnétique qui constitue la MaGIM « Magnetically Geared Induction Machines ». L’objectif est d’améliorer la fiabilité et les performances du système classique associant une machine asynchrone (MAS) à un réducteur mécanique (broyeur, concasseur…), la machine étant alimentée directement par le réseau. Nous dimensionnons un prototype MaGIM de 1 kW - 45 tr/min fonctionnant sur le réseau à 400 V/50 Hz en utilisant des outils de calculs analytiques et numériques permettant de prédire les performances électromagnétiques du dispositif. Nous présentons dans le premier chapitre un état de l’art des différents engrenages magnétiques étudiés depuis le 20ème siècle jusqu'à nos jours. Les différentes structures et topologies étudiées sont recensées. Compte tenu de sa complexité, nous avons modéliser la machine asynchrone et le réducteur de vitesse magnétique séparément, dans le chapitre II. Un modèle théorique de la machine prenant en compte les aspects électromagnétiques et thermiques a été développé pour obtenir un dimensionnement acceptable suivant un cahier des charges précis. Nous avons présenté les performances électromagnétiques du système obtenu ainsi que les calculs thermiques effectués par une méthode nodale. Le fonctionnement en régime transitoire de la machine par l’établissement d’un modèle analytique regroupant les équations mécaniques de la machine asynchrone et de l’engrenage magnétique a été présenté au chapitre III. Ce modèle nous a permis de déterminer les performances de la MaGIM lors d’un démarrage direct sur le réseau. Nous avons pu constater que la MaGIM peut démarrer sur le réseau sous pleine tension et que ce démarrage est fortement dépendant du moment d’inertie Jl. Cette étude nous a permis de mettre en évidence le phénomène de décrochage de la MaGIM et la particularité des engrenages magnétique à se protéger contre les surcharges. Dans le dernier chapitre, nous avons présenté la réalisation du prototype 1 kW, fonctionnant sur le réseau 400 V/ 50 Hz et délivrant 210 Nm en sortie à environ 50 tr/min. Le prototype a été réalisé dans l’atelier mécanique de VEDECOM - Mobilab. Des essais expérimentaux ont été effectués à l’issue de la réalisation dans le but de les comparer aux résultats théoriques et aussi de valider le concept de la MaGIMWe propose in this work to study a wound rotor induction motor integrating a magnetic gear which constitutes the MaGIM " Magnetically Geared Induction Machines ". The aim is to improve the reliability and the performances of the classical system associating an induction machine (MAS) with a mechanical reducer (mill, crusher...), the machine being fed directly by the network. Therefore, we designed a MaGIM prototype of 1 kW - 45 rpm operating on the grid at 400 V/50 Hz using analytical and numerical calculation tools to predict the electromagnetic performances of the device. In the first chapter, we present a state of the art of the different magnetic gears studied from the 20th century to the present day. The different structures and topologies studied are listed. Given its complexity, we have modelled the induction machine and the magnetic gear separately, in chapter II. A theoretical model of the machine taking into account the electromagnetic and thermal aspects has been developed in order to obtain an acceptable design according to precise specifications. We have presented the electromagnetic performance of the system obtained as well as the thermal calculations carried out using a nodal method. The transient operation of the machine by establishing an analytical model including the mechanical equations of the induction machine and the magnetic gear was presented in chapter III. This model allowed us to determine the performance of the MaGIM during a direct start on the network. We have seen that the MaGIM can start on the mains under full voltage and that this starting is strongly dependent on the moment of inertia Jl. This study allowed us to highlight the stall phenomenon of the MaGIM and the particularity of magnetic gears to protect themselves against overloads. In the last chapter, we presented the realization of the 1 kW prototype, operating on the 400 V/ 50 Hz network and delivering 210 Nm output at about 50 rpm. The prototype was produced in the mechanical workshop of VEDECOM - Mobilab. Experimental tests were carried out at the end of the realization in order to compare them with the theoretical results and also to validate the concept of the MaGIM
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Trinkūnaitė, Ingrida. „Asinchroninės bejutiklės pavaros modeliavimas“. Master's thesis, Lithuanian Academic Libraries Network (LABT), 2011. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2011~D_20110621_170245-16691.
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Baigiamajame darbe sudarytas uždarosios asinchroninės bejutiklės vektoriškai valdomos pavaros imitacinis modelis ir ištirtos charakteristikos. Teorinėje darbo dalyje yra aptariami asinchroninių elektros pavarų privalumai bei šiose pavarose naudojami greičio jutikliai. Aprašomi stebiklių privalumai bei trūkumai, pagrindžiamas jų naudojimas asinchroninėse pavarose. Nagrinėjami bejutiklių elektros pavarų ypatumai, aprašomi vektorinio valdymo bendrieji principai bei aprašomi bejutiklėse vektoriškai valdomose pavarose naudojamų stebiklių modeliai. Pateikiami du skirtingi asinchroninių variklių matematiniai modeliai. Tiriamojoje dalyje parenkamas asinchroninio variklio modelis, tiriant abiejų imitacinių modelių dinamines greičio charakteristikas. Sudaromas stebiklio imitacinis modelis. Tiriamos stebiklio greičio dinaminės charakteristikos, sudaroma uždaroji greičio reguliavimo sistema su stebikliu. Analizuojamos uždarosios greičio reguliavimo sistemos greičio charakteristikos be apkrovos, su šuoline apkrova ir harmoniškai kintančia apkrova. Nagrinėjama sistemos stiprinimo koeficiento įtaka uždarosios greičio reguliavimo sistemos greičio charakteristikų pereinamiesiams procesams. Magistro darbas baigiamas tyrimo išvadomis, kuriose aptariamas darbo rezultatų realaus pritaikymo galimybės. Darbą sudaro 8 dalys: įvadas, žymėjimai, literatūros šaltinių analizė, tyrimo tikslas ir uždaviniai, teorinė dalis, tiriamoji dalis išvados ir pasiūlymai, literatūros šaltiniai.The final master degree thesis presents sensorless vector controlled induction motor drive simulation model and characteristics. In the analytic part of master thesis advantages of induction motor drives and speed sensors are described. Advantages and disadvantages of speed estimators are presented and purpose of using them are proved. Peculiarities of sensorless motor drives, principles of vector control and models of speed estimators are analyzed. Two simulation models of induction motor are proposed. In the research part characteristics of induction motors are compared and motor model is chosen. Characteristics of open loop induction motor drive are investigated and simulation model of closed loop induction motor drive with speed estimator is designed. Characteristics of closed loop control system at no load, constant load and harmonic load are analyzed and influence of speed controller gain is considered. Thesis is closed with conclusions about designed system application in real projects. Structure: introduction, list of symbols, literature review, the study aims and objectives, the theoretical part, research part, conclusions and proposals, references.