Relevant bibliographies by topics / Axial Flux Generators

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Academic literature on the topic 'Axial Flux Generators'

Author: Grafiati
Published: 9 March 2023
Last updated: 11 March 2023

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Journal articles on the topic "Axial Flux Generators"

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Radwan-Pragłowska, Natalia, Tomasz Węgiel, and Dariusz Borkowski. "Modeling of Axial Flux Permanent Magnet Generators." Energies 13, no. 21 (November 2, 2020): 5741. http://dx.doi.org/10.3390/en13215741.

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This article focuses on modeling of an Axial Flux Permanent Magnet Generator (AFPMG). The authors analyzed selected variants of disk generators, including coreless stator constructions and with iron core ones, also taking into account the Permanent Magnet (PM) arrangement in order to show the way to obtain the optimal machine characteristics based on analytical equations. In addition to the full model, which takes into account the higher harmonics of the magnetic field distribution, the paper presents a simplified mathematical model developed for generator operation cases such as standalone, connected to a 3-phase power grid and loaded with a diode rectifier. The analytical and finite-element method (FEM) calculations were performed as well as laboratory tests to confirm the correctness of presented model assumptions.
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Faiz, Jawad, Tohid Asefi, and Mohammad Khan. "Design of dual rotor axial flux permanent magnet generators with ferrite and rare-earth magnets." Facta universitatis - series: Electronics and Energetics 33, no. 4 (2020): 553–69. http://dx.doi.org/10.2298/fuee2004553f.

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This article addresses dual rotor axial flux Ferrite permanent magnet (PM) generator, as an alternative to a surface mounted and spoke types Nd-Fe-B generator which have concentrated windings. The performance parameters of all generators, particularly the efficiency, are identical. The design objective function is the generators mass minimization using a population-based algorithm. To predict the performance of the generators a finite element (FE) technique is applied. Besides, the aims of the design include minimizing cogging torque, examining different rotor pole topologies and different pole arc to pole pitch ratios. Three-dimensional FE technique is employed. It is shown that the surface mounted Ferrite generator topology cannot develop the rated torque and also has high torque ripple. In addition, it is heavier than the spoke type generator. Furthermore, it is indicated that the spoke type Ferrite PM generator has favorable performance and could be an alternative to rare-earth PM generators, particularly in wind energy applications. Finally, the performance of the designed generators is experimentally verified.
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Gołębiowski, Lesław, Marek Gołębiowski, Damian Mazur, and Andrzej Smoleń. "Analysis of axial flux permanent magnet generator." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 38, no. 4 (July 1, 2019): 1177–89. http://dx.doi.org/10.1108/compel-10-2018-0415.

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Purpose The purpose of this paper is to compare the methods of calculating the parameters of air-cored stator flux permanent magnet generator and to compare these results with the measurements of the designed and manufactured generator. The generator is to be designed for operation in a wind power plant. Design/methodology/approach An analytical method and 2D and 3D finite element methods (FEMs) were used to calculate the parameters of the coreless permanent magnet axial generator. The analytical method and 2D FEM were applied to individual cross-sections through the air gap of the machine. After the design and construction of the generator and measuring station, the results of calculations and measurements were compared. Findings The results of investigated calculation methods and measurements were found to be mutually compatible. Analytical methods and 2D FEM required proper interpretation of the results when comparing them with the 3D FEM. The results of the measurements and calculations showed the usefulness of the generator for operation in a wind power plant. Originality/value Full comparison of results of 2D and 3D calculations with the results of the measurements on the machine model confirmed the usefulness of fast 2D methods for the analysis of coreless generators. The results differed by the effects of leakage inductance of windings’ front connections. The application of an axial generator designed with the described methods in a wind turbine showed its proper operation.
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Gaing, Zwe Lee, Guan Jie Wnag, and Jui An Chiang. "Implementation of a Coreless Axial-Flux PM Generator for Vertical-Axial Wind Turbine." Advanced Materials Research 694-697 (May 2013): 3273–78. http://dx.doi.org/10.4028/www.scientific.net/amr.694-697.3273.

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In this paper, a rigorous and efficient approach, using the fuzzy-Inference Taguchi method with the multiple performance characteristics index (MPCI), is employed for obtaining the rigorous design of a small-scale direct-drive coreless axial-flux permanent-magnet (AFPM) generator for a vertical-axis wind turbine (VAWT) with both larger induced voltage and higher efficiency. The proposed method first establishes the orthogonal array (OA) recommended by the Taguchi method, then multiple targets are coordinated by the fuzzy inference mechanism to obtain a better combination of geometric parameters for achieving multiple quality targets. The three-dimensional (3-D) electromagnetic finite element method (FEM) is used as the tool for analyzing the performance of the coreless AFPM generator. The results have shown the proposed method can obtain the suitable generators geometric parameters for enhancing the induced voltage of the generator while keeping efficiency as high as possible under the rated speed.
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Wu, Yu Chi, Cheng Lung Lu, Chun Chen Huang, Jing Yuan Lin, Meng Jen Chen, Wen Shiush Chen, and Hsien Yin Chiang. "Design of Double-Deck Household Vertical-Axis Wind Generator." Advanced Materials Research 422 (December 2011): 824–35. http://dx.doi.org/10.4028/www.scientific.net/amr.422.824.

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Wind power has been recognized as one of the important green energy resources in Taiwan. However, installing large-capacity wind generators needs to meet many environmental regulations, limiting the penetration of wind power to households/communities. In this paper, the design of a novel double-deck vertical-axis wind generator for households is presented, hoping “many a little makes a mickle” and making better use of green energy to reduce carbon emission. The proposed wind generator is an axial-flux permanent-magnet (PM) synchronous generator, which design is different from other existing wind generators in several aspects: (1) double decks for double wind turbines vs. single turbine, (2) silicon-steel-lamination-cored vs. air-cored for armature coils, and (3) axial-flux PM generator vs. conventional PM generator. The performance of the proposed design is simulated with the aid of a finite element software package. The experimental results are consistent with the simulation. The prototype of the proposed wind generator is also compared with a commercial mini wind generator on the market. The proposed wind generator produces satisfactory results.
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Demian, Cristian, Raphael Romary, Gilles Vogt, and Valentin Costan. "Practical model of the axial magnetic field in the end region of large turbo-generators." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 38, no. 4 (July 1, 2019): 1295–305. http://dx.doi.org/10.1108/compel-10-2018-0435.

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Purpose The axial magnetic field occurs in the end-region of large turbo-generators is known to induce hot points or voltages between laminations, that may cause insulation breakdown and thus stator faults. Design/methodology/approach It is important to dispose of simple methods for estimating the axial flux rapidly with regard to the operating point of the machine. Findings The authors provide a practical model of the axial magnetic field based on a simplified vector diagram. The parameters required to build the vector composition of the flux densities are assessed with a limited number of finite element method simulations of the whole end-region of the machine. These simulations were validated by an experimental test on a real turbo-generator. Then the axial flux density was simply estimated for various operating points. Originality/value The originality of the paper concerns the practical model of the axial magnetic field based on a simplified vector diagram.
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Novac, B. M., M. C. Enache, I. R. Smith, M. C. Enache, and H. R. Stewardson. "Simple 2D Model for Helical Flux-compression Generators." Laser and Particle Beams 15, no. 3 (September 1997): 379–95. http://dx.doi.org/10.1017/s0263034600010958.

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This paper presents a simple but complete 2D model for helical flux-compression generators that overcomes many of the limitations present in existing zero-dimensional models. The generator circuit is effectively decomposed into separate z and; current carrying circuits, with each of the; circuits (rings) corresponding to a different current. Use is also made of a technique by which these rings are sequentially switched out of circuit. The approach proposed opens the way to a full understanding of the behavior of cascade systems of generators inductively coupled by dynamic transformers using the so-called flux-trapping technique. In addition, the model can also yield an important insight into the phenomena that differentiates the performance of small generators when primed by a capacitor, a battery, or an externally produced magnetic field. Finally, the numerical code developed in the paper can readily be adapted to model high-energy and high-current generators in which the helical coil and the armature are of variable geometry. Valuable design information is provided on the magnetic and the electric field distributions within the generator and on the likely radial and axial movements of the stator turns.
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Wu, Tao, Ning Jun Fan, and Yan Xuan Wu. "Analysis of Magnetic Field for Micro Axial-Flux Electromagnetic Generator." Key Engineering Materials 562-565 (July 2013): 431–35. http://dx.doi.org/10.4028/www.scientific.net/kem.562-565.431.

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This paper reports on the magnetic field distribution and magnetic circuit calculating method of micro generator. A micro axial-flux electromagnetic generator is designed as size of Φ6mm×3mm. Traditional magnetic circuit analysis methods are used to retrieve the air-gap magnetic density on no-load micro generator in operation. FEA is done for the micro generator model using magnetic field numerical simulation software. The main parameters of no-load magnetic field and the waveform of induced EMF are obtained. Comparing the results obtained from the magnetic circuit analysis and numerical simulation, the error of air magnetic density is less than 2.54% and the error of the maximum value of induced EMF is less than 2. 68%. The results suggest that magnetic circuit analysis methods can be used for magnetic field analysis of micro axial-flux electromagnetic generators, and be helpful to provide guidance for designs.
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Setyawan, Eko Yohanes, Choirul Soleh, Awan Uji Krismanto, I. Wayan Sujana, Soeparno Djiwo, and Tutut Nani Prihatmi. "Design and Performance Analysis of Double Axial Flux Permanent Magnet Generator." Trends in Sciences 19, no. 6 (March 3, 2022): 3049. http://dx.doi.org/10.48048/tis.2022.3049.

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In this paper, a new permanent magnet generator structure was proposed in order to facilitate the implementation of the permanent magnet generator on small-scale renewable energy-based power generators. Detail characteristics of a double axial flux permanent magnet generator were analyzed. The proposed generator structure consisted of 2-sided rotors equipped with slots for placing permanent magnets. The stator side comprised 3 groups of coreless winding for realizing 3-phase output. Performances of the axial flux double permanent magnet generator were observed involving the output voltage, currents, and power. Two experimental scenarios have been tested to monitor the performance of the generator. In the first scenario, the loading condition which was represented by the star connection of 3 bulbs of 25 W has been considered. The rotational speed of the tested generator in this scenario was 501.9 rotation per minute (rpm). Under those loading circumstances, 3-phase sinusoidal output voltages with frequencies under 50 Hz have been monitored. Above 50 Hz operational frequency, the output voltage waveform slightly changed from sinusoidal to trapezoidal shapes. In the second scenario, the proposed generator was connected to the rectifier to form a DC system. The 45 W load has been considered in this DC scenario. Under the DC system test, 152.2 V output DC voltage, 0.1614 A current, and 24.976 W power have been monitored when the rotational speed of axial flux double permanent magnet generator was 847.9 rpm.
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Stroganovs, Igors, and Andrejs Zviedris. "Basic Statements of Research and Magnetic Field of Axial Excitation Inductor Generator." Scientific Journal of Riga Technical University. Power and Electrical Engineering 28, no. 1 (January 1, 2011): 49–52. http://dx.doi.org/10.2478/v10144-011-0008-8.

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Basic Statements of Research and Magnetic Field of Axial Excitation Inductor GeneratorIn this work the main features of axial excitation inductor generators are described. Mathematical simulation of a magnetic field is realized by using the finite element method. The objective of this work is to elucidate how single elements shape, geometric dimensions and magnetic saturation of magnetic system affect the main characteristics of the field (magnetic induction, magnetic flux linkage). The main directions of a magnetic system optimization are specified.
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Dissertations / Theses on the topic "Axial Flux Generators"

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Lim, Chin Hong. "Thermal modelling of the ventilation and cooling inside axial flux permanent magnet generators." Thesis, Durham University, 2010. http://etheses.dur.ac.uk/387/.

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Axial flux permanent magnet generators are of particular interest for power generation in harsh and confined conditions. Due to their compactness and high power density, the ventilation and cooling inside axial flux permanent magnet generators have becoming increasingly important for further performance improvement. This thesis describes the developments of a lumped parameter, thermal modelling technique for axial flux permanent magnet generators. The main aim of this research is to develop a fast and accurate thermal modelling tool which can be used for rapid machine design and ultimately, to replace complex and time consuming CFD analyses in the machine design process. The thesis illustrates the construction of a generic thermal equivalent circuit, which comprises of conductive and convective sub-circuits, to model the conduction and convection heat transfers and temperature distributions in the radial and axial directions, within these machines. The conduction heat transfer between the solid components of these electrical machines is modelled by an annulus conductive thermal circuit derived from previous researchers; whereas, for convection heat transfer between the working fluid (air) and solids, the author has developed two convective thermal circuits, which are demonstrated as the Temperature Passing Method (TPM) and Heat Pick-up method in (HPM) in the thesis. Several case studies were designed to investigate the validity and accuracy of these thermal sub-circuits with both steady and transient boundary conditions. Since all the thermal impedances and capacitances used in the thermal circuits are in dimensionless form, the developed generic thermal equivalent circuit is capable of performing thermal simulations for axial flux generators of different sizes and topologies. Furthermore, special correction factors were introduced into the developed generic thermal equivalent circuit, to take into account the heat transfer in the circumferential direction in axial flux machines. The thesis also demonstrates how the heat transfer in the stator windings is modelled in the generic thermal equivalent circuit. Two analytical models, which are the Simple Concentric Model (SCM) and Concentric-annulus Layer Model (CLM) were developed, for the evaluation of the thermal resistances of the stator windings. The results evaluated from these analytical models were validated by several numerical models and experimental results of two-phase materials published by previous researchers. Lastly, experimental validation of the lumped parameter thermal equivalent circuit model and CFD simulations was conducted. Heat transfer coefficient measurements were carried out on two separate test rigs, which were a simplified single-sided axial flux machine test rig and a large-scale low speed axial flux machine. The experimental results were compared with the numerical results obtained from both the lumped parameter and CFD models. Good agreement between the experimental, lumped parameter model and CFD results were found. These indicate that the developed generic thermal circuit is potentially capable of replacing CFD analyses in the axial flux machines design process.
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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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Vun, Sook Teng. "Methodology for designing megawatt-scale yokeless and segmented armature (YASA) generators for wind turbines." Thesis, University of Oxford, 2016. http://ora.ox.ac.uk/objects/uuid:af80d024-58b6-4bb8-adca-a4aa70b69a36.

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This thesis develops design methodologies for megawatt(MW)-scale yokeless and segmented armature (YASA) generators for wind turbine applications. The methodologies include the electromagnetic, the structural and the thermal designs of a YASA generator. The design process starts with developing an analytical method to generate preliminary machine designs for a megawatt-scale YASA generator. This analytical approach considers both electromagnetic and structural aspects of a generator, the parameters of which were obtained and visualised on a design reference map. This new concept of displaying machine parameters is useful for a designer to identify the relationship between them. An optimisation tool using pseudo-weight approach is integrated into the analytical tool to determine a optimum machine design. This is a flexible optimisation tool, allowing the user to give priorities to each objective function. The analytical calculation has reduced the design space for suitable machine candidates to be applied in further finite element analysis (FEM). In finite element analysis of an optimised YASA machine, the electromagnetic performance of a 1 MW YASA generator was produced and verified with analytical and experiment results. This is followed by structural optimisation with finite element method, where a spider wheel with a support ring geometry is applied to the rotor plate. This reduces the structural weight by more than 50% while the structure retain strong stiffness. Finally, the cooling system of the stator of the YASA generator is studied and the cooling channels design is proposed. Simulation results show that the stator of a 1 MW YASA generator can be effectively cooled with forced air.
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Fernandez, sanchez Alejandro. "Étude de machines électriques non conventionnelles pour des alternateurs industriels." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLC084/document.

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Cette thèse s’intéresse à l’analyse de structures de machines électriques non conventionnelles destinées à la production d’électricité par des groupes électrogènes. Les topologies recherchées doivent utiliser moins de matières actives et/ou simplifier la procédure de fabrication par rapport aux machines actuelles.Une des structures est dédiée au système d’excitation de la machine. Elle possède un stator à griffes avec un bobinage toroïdal. Son dimensionnement est réalisé à l’aide d’un modèle de calcul par éléments finis en 3D, qui a été validé expérimentalement. Cette structure permet d’obtenir une réduction significative de la quantité de cuivre dans le bobinage.Les deux autres structures traitées concernent l’alternateur principal. Une machine synchro-réluctante à barrières deflux et à rotor bobiné a été proposée. L’objectif est d’augmenter la densité de couple grâce au couple de saillance. Elle est dimensionnée et comparée avec la structure conventionnelle. Ce cas met en évidence les limitations des structures proches de la structure actuelle.La dernière structure est une nouvelle topologie de machine électrique. Elle combine les caractéristiques des machines à flux axial et des machines à griffes, permettant de simplifier le système d’excitation. Une approche de modélisation originale a été développée pour l’analyse de cette topologie 3D en vue de son dimensionnement par optimisation. Le système d’excitation a un rôle important dans les performances de cette machine.Cette thèse constate aussi que l’évolution future des matériaux magnétiques pourrait tirer meilleur profit des structures non-conventionnelles avec des trajets de flux tridimensionnels
The PhD project aims to analyse nonconventional structures of electric machines for electric power generation with diesel gensets. The researched topologies should use less active materials and/or simplify the manufacturing process compared to today’s machines.One of the structures is intended for the excitation system of the electric machine. It is composed of a claw-pole stator and a toroidal winding. It is designed using a 3D Finite Element model, previously validated by a prototype. This structure allows a significant reduction of the quantity of copper of the field winding.The other two structures under study are proposed for the main generator. A synchronous-reluctance machine with flux-barriers and a field winding in the rotor is analysed. The objective is to increase the torque density by increasing the reluctance torque. The designed machine is compared to the conventional structure. This case shows the limitations of structures similar to the current structure.The last structure is a new topology of electric machine. It combines the characteristics of claw-pole machines andaxial-flux machines. An original modelling approach is developed to analyse this 3D structure for its design based on an optimization algorithm. The study shows that the excitation system has a key role in its performances.This work also notes that the future evolution of magnetic materials should benefit the use of non-conventional structures with 3D flux paths
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De, Bortoli Manuel. "MODELLIZZAZIONE DI SISTEMI DI GENERAZIONE DI ENERGIA ELETTRICA PER VIA EOLICA." Doctoral thesis, Università degli studi di Padova, 2010. http://hdl.handle.net/11577/3422237.

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The arguments of this PhD Thesis are divided in two parts: a first part regarding the development of control algorithms to optimize the efficiency of wind energy systems and, at the same time, to simplify the system structure avoiding the mechanical sensors. The second part regards the analysis and design of axial flux permanent magnet generators for wind applications. Furthermore, I analyzed other particular aspects such as axial strengths and permanent magnet losses.
Gli argomenti trattati in questa Tesi di Dottorato sono articolati in due parti. Una prima è rivolta allo sviluppo di algoritmi di controllo aventi lo scopo di ottimizzare la resa energetica di sistemi eolici consentendo allo stesso tempo una semplificazione del sistema stesso grazie all'assenza di sensori per la rilevazione di grandezze meccaniche. La seconda parte riguarda l'analisi ed il progetto di generatori sincroni a flusso assiale a magneti permanenti da utilizzare in applicazioni eoliche. Sono stati inoltre analizzati particolari aspetti elettromagnetici quali gli sforzi assiali gravanti sulle parti statoriche e rotoriche ed il calcolo delle perdite per correnti indotte nei magneti permanenti.
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El-Hasan, Tareq Sadeq Fawzi. "Design of a permanent magnet axial flux high-speed generator." Thesis, University of Hertfordshire, 2002. http://hdl.handle.net/2299/14045.

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Electrical generating sets powered by gas turbines are required for many applications, in particular for emergency situations due to their critical attributes; high reliability, lightweight, small size, multi-fuel capabilities, low maintenance, low noise and low gas emissions. This research contends that a permanent magnet axial flux (PMAF) high-speed generator with a small gas turbine engine offers advantages over the radial flux permanent magnet generators. Higher power densities can be achieved with the axial flux configuration when compared to their counter parts of the radial flux machines of similar output power. The attributes of the PMAF machines were certainly appealing; lightweight, small size, high efficiency and ease of construction. In this research, a design approach for the PMAF high-speed generator which accounts for the mechanical and electrical aspects was provided. The machine's key components such as retainment ring was carefully designed and the materials utilised in their structures were appropriately selected to insure high mechanical integrity, ease of construction and low manufacturing cost. The generator's principle dimensions were determined from a theoretical model which was derived from the machine's main design parameters. This theoretical model was then correlated by some empirical coefficients determined through the manipulation of the experimentally validated finite element (FE) results. The analytical results have shown that with the appropriate design considerations, PMAF high-speed generators can be designed with high power densities in the range of 6-8 kW/kg and high efficiencies ideally in the range of 94 - 96 %. The mechanical integrity and the steady state electrical performance of the machine were analysed using three-dimensional (3D) FE models. More in this research, a parametric study was carried out on the most influential parameters of the machine to improve its electrical performance through minimise rotor and stator eddy current losses. In addition, the total harmonic distortion in the output waveform was minimised through the appropriate and careful design of the magnet shape and topology with the aid of 3D electromagnetic FE analysis. Furthermore, using FE it was possible to design, optimise and analyse the rotor back-iron disc through the selection of best material, shape and size for use in the PMAF high-speed generator. A prototype of the PMAF high-speed generator was constructed and tested preliminary at low speed for the purpose of the evaluation of the electrical performance of the machine. Experimental results have shown that the machine was capable to meet the design requirements. For the mechanical integrity of the machine, the rotors were safely tested on a cold run test rig at the speed of 47,000 rpm. This thesis describes also the trends and the technical details in the manufacturing, construction and experimental setup for the PMAF high-speed generator.
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Djebarri, Sofiane. "Contribution à la modélisation et à la conception optimale de génératrices à aimants permanents pour hydroliennes." Thesis, Brest, 2015. http://www.theses.fr/2015BRES0012/document.

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L'amélioration des performances des chaînes de conversion dédiées à la récupération d'énergie par les hydroliennes est un point particulièrement important pour rendre cette ressource économiquement attractive. La minimisation du coût de l'énergie produite passe nécessairement par une amélioration des performances de la chaîne de conversion électromécanique et une réduction des coûts de maintenance et de production des éléments la constituant. Dans ce contexte particulier, les génératrices à aimants permanents apparaissent particulièrement intéressantes dans la mesure où elles sont bien adaptées à un fonctionnement à basse vitesse et à fort couple. Ceci permet d'éliminer des systèmes mécaniques très complexes, encombrants et exigeants en maintenance, tels que le multiplicateur de vitesse et/ou le système d'orientation des pales. L'objectif de cette thèse est d’explorer un certain nombre de pistes concernant les outils, les concepts et les règles de conception à mettre en oeuvre pour dimensionner une génératrice associée en entraînement direct à une turbine hydrolienne à pas fixe. Les outils mis au point dans ces travaux englobent des modèles multi-physiques intégrés dans une démarche de conception qui se veut la plus globale possible. Cette méthodologie tient compte de la caractéristique de la ressource (courants de marées), de celle de la turbine (hélice), des spécifications de la génératrice à aimants permanents, de la mise en oeuvre d’une stratégie de pilotage associant MPPT et limitation de puissance par défluxage à fort courants de marées, en plus des contraintes liées au convertisseur. L'environnement de conception développé est basé sur un couplage des modèles dans une procédure d'optimisation. Les résultats obtenus mettent en lumière les points clés associés au développement d’une telle génératrice pour un contexte hydrolien
The improvements of marine current turbines drive train are key features to ensure safe operation and to make tidal energy resource cost-attractive. In this context, eliminating mechanical systems that demand high-level of maintenance can be an interesting way to improve the global behavior of tidal turbines. For that purposes, the presented studies focus on design methodologies and concepts of direct-driven generators associated with fixed-pitch turbines. The proposed designs are based on multiphysics models of the generator that are integrated in an optimization process taking into account the drive train environment. For these reasons, several models have been integrated into a global design strategy in order to find solutions that improve marine current turbines performances. This strategy is based on the use of an optimization process that combines electromagnetic model, thermal model, turbine performances model, and tidal resource velocity profile. This methodology integrates also an efficient control strategy based on a maximum power point tracking (MPPT) approach at low tidal speed and a flux-weakening power limitation control at high tidal speed. This control at high tidal velocities is in this work achieved by considering only the generator electrical control without using blade pitching systems. The obtained results highlight trends that could lead to an improvement of the design and they help designers to set relevant technological choices in order to ensure significant cost reduction and highly improve the reliability of marine current turbines
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Bronn, Lodewyk. "Design and performance evaluation of a magnetically geared axial-flux permanent magnet generator." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/19949.

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Thesis (MScEng)--Stellenbosch University, 2012.
ENGLISH ABSTRACT: This thesis is a description of how the first magnetically geared axial flux permanent magnet generator (MGAFG) is designed, constructed and experimentally evaluated. Magnetic gears (MGs) allow for contact-less power transfer and lubricant free operation, which may solve the reliability concerns with current mechanically geared wind energy converters. However, the complex structure of MGs may present serious challenges to its design. Thus, special care should be given to the mechanical layout and the electromagnetic influence of every component. The MGAFG can be configured to be magnetically coupled or decoupled. In the coupled configuration the permanent magnets (PMs) of the MG contribute to the total flux linkage in the PM generator (PMG). The coupled configuration is therefore more efficient. The processing time required to optimise the decoupled configuration is however much faster, since the MG and the PMG can be optimised separately. The optimised results show that a torque density in excess of 100kNm/m3 could be achieved, which is significantly higher than any of known electrical machines. However, owing to excessive losses in the mechanical support structures, the prototype exhibited lower torque density and poor efficiency. The design related aspects and issues are analysed and discussed in detail in an attempt to outline problem areas in the design process. Relevant recommendations are also given for future design improvements. The costs of magnetic material accounts for over fifty percent of the total cost of the prototype. Therefore to make the manufacturing of the MGAFG more economically viable magnetic material should be minimised in the design process.
AFRIKAANSE OPSOMMING: In hierdie tesis word die eerste magnetiese geratte aksiale vloed permanente magneet generator (MGAVG) ontwerp, vervaardig en eksperimenteel geëvalueer. In magnetiese ratte (MR) is daar geen kontak tussen werkende dele nie, daarom word geen smeermiddels benodig nie. Dit dra by tot die betroubaarheid van die ratkaste in wind energie generators en kan onderhoud grotendeels uitskakel. Die komplekse struktuur van magnetiese ratte kan egter die betroubaarheid van die ontwerp juis verswak. Daarom moet die meganiese uitleg noukeurig beplan word sodat dit nie die elektromagnetiese werking ondermyn nie. Die magnetiese rat (MR) en die permanente magneet generator (PMG) van die masjien kan magneties of sonder magnetiese koppeling verbind word. In die gekoppelde konfigurasie dra all die permanente magnete van die MR gesamentlik by tot die totale vloed-koppeling in die PMG. Wat die magnetiese gekoppelde konfigurasie meer doeltrefend maak. Minder tyd word benodig om die nie magnetiese gekoppelde konfigurasie te optimaliseer omdat die MR en die PMG apart geoptimaliseer kan word. Die optimale resultate toon dat ’n wringkrag van meer as 100kNm/3 bereik kan word, wat aansienlik beter is as die van bekende elektriese masjiene. Maar as gevolg van oormatige verliese in die meganiese strukture, toon die prototipe lae wringkrag digtheid en swak doeltreffendheid. Die ontwerp probleme word ontleed en bespreek in ’n poging om probleem areas in die ontwerp te identifiseer. Relevante aanbevelings word gegee vir toekomstige ontwerp verbeterings. Die koste van die magnetiese material verteenwoordig meer as vyftig persent van die vervaardigings koste van die prototipe. Koste kan bespaar word op die vervaardiging van die MGAVG deur die hoeveelheid magnete wat gebruik word te beperk.
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Wanjiku, John Gitonga. "Design of an axial-flux generator for a small-scale wind electrolysis plant." Master's thesis, University of Cape Town, 2010. http://hdl.handle.net/11427/11683.

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Includes abstract.
Includes bibliographical references (leaves [124]-128).
The main objective of this study is the selection and design of a wind generator to meet electrolyser requirements. These are the hydrogen production rate, the power requirements and the operating temperature. This requires the analysis of the load, sizing and characterizing of an electrolyser and finally, the design of a wind generator that meets electrolyser requirements. A hybrid system that combines the use of hydrogen as an efficient form of energy storage, and the growing renewable energy (RE) industry is discussed in detail.
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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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Books on the topic "Axial Flux Generators"

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Axial-Flux Permanent Magnet Generator: Design and Simulation. Independently Published, 2022.

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Book chapters on the topic "Axial Flux Generators"

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Vu, Thanh Nguyen, Tan Nguyen Viet, and Vuong Dang Quoc. "A Novel Approach for Determination of Main Dimensions and Armature Reactions of Axial Flux Permanent Magnet Generators." In Advances in Engineering Research and Application, 53–64. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-22200-9_6.

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Premaratne, P., M. Q. Abdullah, I. J. Kadhim, B. Halloran, and P. J. Vial. "Optimization of Low-Speed Dual Rotor Axial Flux Generator Design Through Electromagnetic Modelling and Simulation." In Intelligent Computing Theories and Application, 786–801. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-84522-3_64.

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Ramesh Babu, V., and A. Ganapathi. "Low Voltage Ride Through (LVRT) Capability Enhancement of Axial Flux Induction Generator-Based Wind Energy Conversion System." In Lecture Notes in Electrical Engineering, 405–16. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-2256-7_39.

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Newnham, Robert E. "Magnetic phenomena." In Properties of Materials. Oxford University Press, 2004. http://dx.doi.org/10.1093/oso/9780198520757.003.0016.

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In this chapter we deal with a number of magnetic properties and their directional dependence: pyromagnetism, magnetic susceptibility, magnetoelectricity, and piezomagnetism. In the course of dealing with these properties, two new ideas are introduced: magnetic symmetry and axial tensors. Moving electric charge generates magnetic fields and magnetization. Macroscopically, an electric current i flowing in a coil of n turns per meter produces a magnetic field H = ni amperes/meter [A/m]. On the atomic scale, magnetization arises from unpaired electron spins and unbalanced electronic orbital motion. The weber [Wb] is the basic unit of magnetic charge m. The force between two magnetic charges m1 and m2 is where r is the separation distance and μ0 (=4π×10−7 H/m) is the permeability of vacuum. In a magnetic field H, magnetic charge experiences a force F = mH [N]. North and south poles (magnetic charges) separated by a distance r create magnetic dipole moments mr [Wb m]. Magnetic dipole moments provide a convenient way of picturing the atomistic origins arising from moving electric charge. Magnetization (I) is the magnetic dipole moment per unit volume and is expressed in units of Wb m/m3 = Wb/m2. The magnetic flux density (B = I + μ0H) is also in Wb/m2 and is analogous to the electric displacement D. All materials respond to magnetic fields, producing a magnetization I = χH, and a magnetic flux density B = μH where χ is the magnetic susceptibility and μ is the magnetic permeability. Both χ and μ are in henries/m (H/m). The permeability μ = χ + μ0 and is analogous to electric permittivity. χ and μ are sometimes expressed as dimensionless quantities (x ̅ and μ ̅ and ) like the dielectric constant, where = x ̅/μ0 and = μ ̅/μ0. Other magnetic properties will be defined later in the chapter. A schematic view of the submicroscopic origins of magnetic phenomena is presented in Fig. 14.1. Most materials are diamagnetic with only a weak magnetic response induced by an applied magnetic field.
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Conference papers on the topic "Axial Flux Generators"

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Georgiev, Nikola. "Study of Three-Phase Axial Flux Generators." In 2018 20th International Symposium on Electrical Apparatus and Technologies (SIELA). IEEE, 2018. http://dx.doi.org/10.1109/siela.2018.8447093.

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Skarmoutsos, G. A., K. N. Gyftakis, and M. Mueller. "MCSA versus Flux Monitoring for Demagnetization Diagnosis in Axial-Flux PM Generators." In 2021 IEEE 13th International Symposium on Diagnostics for Electrical Machines, Power Electronics and Drives (SDEMPED). IEEE, 2021. http://dx.doi.org/10.1109/sdemped51010.2021.9605530.

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Wibowo, H. A., A. Pradikta, and P. A. Dahono. "An analysis of slotless axial flux permanent magnet generators." In 2012 International Conference on Power Engineering and Renewable Energy (ICPERE). IEEE, 2012. http://dx.doi.org/10.1109/icpere.2012.6287229.

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Kurt, Erol, Serdal Aslan, Halil Gor, and Mehmet Demirtac. "Electromagnetic analyses of two axial-flux permanent magnet generators (PMGs)." In 2013 IV International Conference on Power Engineering, Energy and Electrical Drives (POWERENG). IEEE, 2013. http://dx.doi.org/10.1109/powereng.2013.6635621.

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Pop, Adrian Augustin, Florin Jurca, Claudiu Oprea, Mihai Chirca, Stefan Breban, and Mircea M. Radulescu. "Axial-flux vs. radial-flux permanent-magnet synchronous generators for micro-wind turbine application." In 2013 15th European Conference on Power Electronics and Applications (EPE). IEEE, 2013. http://dx.doi.org/10.1109/epe.2013.6634639.

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Andriollo, M., M. De Bortoli, G. Martinelli, A. Morini, and A. Tortella. "Analysis of the air-gap asymmetry in axial-flux permanent magnet generators." In 2009 IEEE International Electric Machines and Drives Conference (IEMDC). IEEE, 2009. http://dx.doi.org/10.1109/iemdc.2009.5075228.

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Dranca, Marius, Mihai Chirca, and Stefan Breban. "Comparative Design Analysis of Axial Flux Permanent Magnet Direct-Drive Wind Generators." In 2019 11th International Symposium on Advanced Topics in Electrical Engineering (ATEE). IEEE, 2019. http://dx.doi.org/10.1109/atee.2019.8724928.

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Lim, C. H., J. R. Bumby, R. G. Dominy, G. I. Ingram, K. Mahkamov, N. L. Brown, A. Mebarki, and M. Shanel. "2-D lumped-parameter thermal modelling of axial flux permanent magnet generators." In 2008 International Conference on Electrical Machines (ICEM). IEEE, 2008. http://dx.doi.org/10.1109/icelmach.2008.4799880.

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Huang, Lei, Yang Li, Lai Wei, and Minshuo Chen. "Comparison Research on Axial Flux Modulation Generators for Linear-rotary Wave Energy Conversion." In 2022 IEEE 20th Biennial Conference on Electromagnetic Field Computation (CEFC). IEEE, 2022. http://dx.doi.org/10.1109/cefc55061.2022.9940730.

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Deng, Qiu-ling, Xiao Peng, and Weicai Xie. "Design of Axial Flux Permanent Magnet Synchronous Generators with Soft Magnetic Compound (SMC) Stator Core." In 2009 International Conference on Energy and Environment Technology. IEEE, 2009. http://dx.doi.org/10.1109/iceet.2009.266.

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Reports on the topic "Axial Flux Generators"

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Arnold, David P., Yeun-Ho Joung, Iulica Zana, Jin-Woo Park, Sauparna Das, Jeffrey H. Lang, David Veazie, and Mark G. Allen. High-Speed Characterization and Mechanical Modeling of Microscale, Axial-Flux, Permanent-Magnet Generators. Fort Belvoir, VA: Defense Technical Information Center, January 2005. http://dx.doi.org/10.21236/ada465069.

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Lipo, T. A., and P. Tenca. Design and Test of a Variable Speed Wind Turbine System Employing a Direct Drive Axial Flux Synchronization Generator: 29 October 2002 - 31 December 2005. Office of Scientific and Technical Information (OSTI), July 2006. http://dx.doi.org/10.2172/887343.

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