Dissertations / Theses: 'Switched Reluctance Motors'

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Kummara, Venkata Guru Raghavendra. "Simulation of Switched Reluctance Motors." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017.

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This project includes the basic principle of the switched reluctance motors, motor topologies, mathematical approach, torque production, electromagnetics, drives, converters and their applications. This part means to help to understand the working principle and properties of SRM,(Switched Reluctance Motors). Some controlling actions of the SRM, such as Current Control and Speed Control, are employed. Simulation results will be discussed at the end and compared with the predefined Simulink Model of the Switched Reluctance Motors.

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Amreiz, Hassan Musa. "Transverse flux switched reluctance motors." Thesis, University of Newcastle Upon Tyne, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.270782.

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El-Kharashi, Eyhab Aly Kamel. "Segmented rotor switched reluctance motors." Thesis, University of Newcastle upon Tyne, 2003. http://hdl.handle.net/10443/3112.

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This thesis introduces and researches the concept of a new form of switched reluctance motor, in which the rotor is made from a series of discrete segments. Single phase machines are initially examined and design rules established. Predictions of air-gap force density are compared with toothed rotor equivalents and it is shown that much greater force densities are theoretically possible with the segmental design. The thesis then proceeds to apply the concepts developed to two different three phase configurations, which show particular advantages. Two demonstrator machines are designed and built, and their method of construction described. Measured static test results are initially presented for each machine and compared with a conventional switched reluctance motor of the same dimensions, revealing both the advantages and disadvantages of the two segmental rotor configurations. Both demonstrator machines are then run as SRM drives, with the current to each phase supplied from an asymmetric half bridge converter. The current and voltage waveforms are monitored, along with measurements of mean torque output. Waveforms are compared with those predicted by simulations and conclusions are drawn regarding the performance of the drive systems. The results of this work clearly demonstrate that segmental rotor SRMs have much greater torque capability than conventional toothed geometries. Of the two demonstrator machines constructed, one has a very high torque per unit loading, but has relatively long end-windings; the other has slightly reduced torque per unit loading but overcomes the problem of long end-windings. Both machines appear to outperform other forms of reluctance motor.

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Motamedi-Sedeh, Ardeshir. "Speed control of switched reluctance motors." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ28241.pdf.

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Lin, Zhengyu. "Advanced control of switched reluctance motors." Thesis, Heriot-Watt University, 2005. http://hdl.handle.net/10399/266.

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Chumacero, Polanco Erik. "Velocity sensorless control switched reluctance motors." Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112062/document.

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Dans ce mémoire de thèse, nous présentons la conception, l'analyse de la stabilité, les simulations numériques et aussi les résultats des expérimentes concernant différents contrôleurs de vitesse mécanique du moteur à réluctance variable (MRV).Dans les deux premiers chapitres une brève description de la physique et de la construction du MRV est présenté ainsi que le problème du contrôle d'être abordé, c'est la commande de vitesse sans capteur. Il est aussi présenté l'état de l'art de ce problème et certains des solutions proposées dans d'autres travaux. On propose notre solution et on présente un petit résumé des articles scientifiques qui ont été publiés dans des magazines et des conférences.Dans le chapitre numéro trois est présenté le design du contrôleur adaptatif et sans capteur du MRV. On suppose, dans une première étape que seule la vitesse mécanique est inconnue et la stabilité exponentielle uniforme des erreurs de suivement est obtenue. Dans une deuxième étape, les conditions d'opération sont aggravées et, en plus de la vitesse, les paramètres physiques sont également supposées inconnues, la stabilité asymptotique uniforme est obtenue dans ce cas. L'estimation des paramètres du MRV est garantie grâce à la condition de persistance d'excitation. Cette commande se compose de deux boucles, une boucle interne basée sur un contrôleur de type PI2D qui est particulièrement intéressant parce qu'il est libre de modèle; cette boucle entraîne les variables mécaniques -la position et la vitesse- vers une référence désirée. Une deuxième boucle de contrôle externe prend le courant électrique vers un ' "courant de référence virtuelle" qui est généré sur la base d'une approche de partage de couple. Le contrôleur propose est testé au niveau de simulations numériques qui sont également présentés.Dans le quatrième chapitre, une nouvelle approche de modélisation du MRV est utilisée pour concevoir le contrôleur. Dans ce scénario, on suppose que l'ensemble de l'état et tous les paramètres physiques sont disponibles, cette approche est pensée pour être adapté au contrôleur basé sur observateur, recherche qui est en cours de développement. Le contrôleur est composé de deux boucles, également que celui qui a été mentionné précédemment. Ce contrôleur est sélectionné parce qu'il est approprié pour le contrôle d'équivalence vraie, qui il s'agit de remplacer les «mesures physiques» provenant d'un capteur par les «observations» provenant d'un observateur. La mise en oeuvre numérique est effectuée sur Simulink de Matlab.Enfin, dans le chapitre cinq, les résultats expérimentaux qui ont été effectués pour évaluer la performance des contrôleurs proposés -ce sont les PI2D et adaptatif PI2D pour le modèle simplifie ainsi que le PID pour le nouveau approche de modélisation- sont présentés. Dans la première partie, une brève description de la construction du banc de tests utilisé est présenté ainsi que quelques-unes caractéristiques techniques. Trois différentes profils de vitesse sont imposées à chacun des contrôleurs proposés -ce sont la tangente hyperbolique, la rampe saturée et la référence sinusoïdal- et de bonnes résultats sont obtenus en considérant que la variable contrôlée est la vitesse. Le dernier chapitre correspond aux conclusions de la recherche effectuée ainsi qu'aux travaux futurs
In this thesis dissertation we present the design, stability analysis, numerical simulations and physical experiments of different controllers designed to drive the mechanical velocity of the switched reluctance motor (SRM). In the First and Second Chapters a brief description of the physics and construction of the SRM is presented, as well as the problem of control to be aboard, that is the velocity sensorless control of motors and the state of the art of this problem. The proposed solution is introduced and a summary of the published papers as well as the contribution are also presented.In the Chapter number three is presented the velocity sensorless and adaptive control of the SRM. It is assumed, in a first stage, that only mechanical velocity is unknown, uniform exponential stability of the errors is achieved in this scenario. In a second stage, conditions are stressed and in addition to the velocity, physical parameters are also assumed unknown, uniform asymptotical stability is achieved in this case and parameters estimation is guaranteed under a persistence of excitation condition. This controller consists of two loops, an internal loop based on a PI2D–type controller which is of particular interest given it is free-model; this loop drives the mechanical variables –that is position and velocity- towards a desired reference. An external control loop takes the electrical current towards a ‘’virtual” current reference which is generated based on a torque share approach. The controller is tested on numerical simulations, which are also presented.In the fourth chapter, a new approach on the modeling of the SRM is utilized to design the controller, in this scenario is assumed that the whole state and all the physical parameters are available, however this approach is thought to be suitable to observer based controller, whose ongoing research is being performed. The controller is composed by two loops, similarly to the one mentioned previously. This controller is selected because it is suitable for certainty equivalence control, that is, to substitute the “measurements” by the “observations” coming from a virtual sensor. Numerical implementation is performed on Simulink of Matlab.Finally, in the Chapter five, the experimental results carried out to evaluate the performance of the proposed controllers are presented, these are the PI2D and the adaptive PI2D controllers for the simplified model and the $PID$ controller for the novel modeling approach. In the first part, a brief description of the construction of the utilized bench is presented as well as the some technical characteristics. Three different velocity profiles were imposed to each of the overmentioned controllers –these are the so called smooth step, the saturated ramp and the sinusoidal reference- and good results, considering that the controlled variable is the velocity, were obtained. The last chapter corresponds to the conclusions of the performed research as well as to the future work

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Sakurai, Atsuhiko. "Sliding mode control of switched reluctance motors." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/MQ63026.pdf.

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Shaikh, Abdulbasad Abdulkader. "Computer aided design of switched reluctance motors." Thesis, Imperial College London, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.325101.

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Kjaer, Philip Carne. "High-performance control of switched reluctance motors." Thesis, University of Glasgow, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.362954.

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Pollock, Charles. "Power converter circuits for switched reluctance motors." Thesis, Heriot-Watt University, 1989. http://hdl.handle.net/10399/844.

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陳基和 and Jihe Chen. "Chaos in DC and switched reluctance motor drives." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2000. http://hub.hku.hk/bib/B31239973.

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Chen, Jihe. "Chaos in DC and switched reluctance motor drives /." Hong Kong : University of Hong Kong, 2000. http://sunzi.lib.hku.hk/hkuto/record.jsp?B2197942X.

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Rehman, Saeed ur. "Commutation, identification and estimation for switched reluctance motors." Diss., Georgia Institute of Technology, 1996. http://hdl.handle.net/1853/13412.

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Jenkinson, Graeme Craig. "The design of single-phase switched reluctance motors." Thesis, University of Leeds, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.405002.

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Bae, Han-Kyung. "Control of Switched Reluctance Motors Considering Mutual Inductance." Diss., Virginia Tech, 2000. http://hdl.handle.net/10919/28593.

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A novel torque control algorithm, which adopts a two-phase excitation, is proposed to improve the performance of the Switched Reluctance Motor (SRM) drive. By exciting two adjacent phases instead of single phase, the changing rate and the magnitude of the phase currents are much reduced. Therefore the existing problems caused by the single-phase excitation such as large torque ripple during commutation, increased audible noise and fatigue of the rotor shaft are mitigated. The electromagnetic torque is efficiently distributed to each phase by the proposed Torque Distribution Function (TDF) that also compensates the effects of mutual coupling. To describe the effects of mutual coupling between phases, a set of voltage and torque equations is newly derived for the two-phase excitation. Parameters of the SRM are obtained by Finite Element Analysis (FEA) and verified by measurements. It is shown that the mutual inductance of two adjacent phases partly contributes to generate the electromagnetic torque and introduces coupling between two adjacent phases in the current or flux linkage control loop, which has been neglected in the single-phase excitation. The dynamics of the current or flux linkage loop are coupled and nonlinear due to the mutual inductance between two adjacent phases and the time varying nature of inductance. Each phase current or flux linkage needs to be controlled precisely to achieve the required performance. A feedback linearizing current controller is proposed to linearize and decouple current control loop along with a gain scheduling scheme to maintain performance of the current control loop regardless of rotor position as well as a feedback linearizing flux linkage controller. Finally, to reduce current or flux linkage ripple, a unipolar switching strategy is proposed. The unipolar switching strategy effectively doubles the switching frequency without increasing the actual switching frequency of the switches. This contributes to the mitigation of current or flux linkage ripple and hence to the reduction of the torque ripple.
Ph. D.

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Richardson, Kevin M. "An integrated switched reluctance marine propulsion unit." Thesis, University of Warwick, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.265625.

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Pasquesoone, Gregory. "Controls for High Performance Three-Phase Switched Reluctance Motors." University of Akron / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=akron1310874393.

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Aljaism, Wadah A. "Switched reluctance motor design, simulation and control /." View thesis, 2007. http://handle.uws.edu.au:8081/1959.7/26494.

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Thesis (Ph.D.) -- University of Western Sydney, 2007.
A thesis presented to the University of Western Sydney, College of Health and Science, School of Engineering, in fulfilment of the requirements for the degree of Doctor of Philosophy. Title from title screen. Includes bibliographical references. Thesis minus Appendix B (video clips and photos) also available online at: http://handle.uws.edu.au:8081/1959.7/26494.

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Vijayraghavan, Praveen. "Design of Switched Reluctance Motors and Development of a Universal Controller for Switched Reluctance and Permanent Magnet Brushless DC Motor Drives." Diss., Virginia Tech, 2001. http://hdl.handle.net/10919/29799.

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Switched Reluctance Machines (SRMs) are receiving significant attention from industries in the last decade. They are extremely inexpensive, reliable and weigh less than other machines of comparable power outputs. Although the design principles of the machine are available as a concatenation of many different sources, the need for a unified, step-by-step design procedure from first principles of electromagnetics is an absolute requirement. This dissertation discusses a procedure that can be applied by engineers with a basic background in electromagnetics. Subsequent to the design of the machine, existing finite element software can do the analysis of the machine. However, this is a laborious process and the need for an analytical method is preferable to verify the design procedure before the final verification by finite elements. The analytical procedure as well as a procedure to calculate iron losses is also developed in this dissertation. A prototype machine has been developed as an example of the design process and an existing prototype is analyzed to verify the analysis procedure. The similarities between the SRM and the Permanent Magnet Brushless DC Machine (PMDBC) beg the consideration of the development of a converter that can be used to drive either machine. One such converter has been developed in this dissertation. The design of the drive for both the machines is seen to be very similar. As a consequence, a universal controller that can be used to operate both machines has been developed and implemented with a DSP. Simulations and experimental correlation for both drives have been presented.
Ph. D.

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Oza, Ameesh R. "A microprocessor control scheme for switched reluctance motor drives." Thesis, Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/76444.

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A microprocessor control scheme for variable speed switched reluctance motor(SRM) drives is discussed. A particular implementation derived from first principles of the SRM is presented. The Intel 8088 microprocessor is used for the design implementation. It is shown that given the control requirements of the SRM like firing different phases according to rotor position and phase currents, a microprocessor controller is a good choice. The controller is economical since it uses standard TTL chips. The slow response at low speeds is also discussed. Experimental results performed on a static inductive load using a simulated position feedback are presented, showing how the current control available at lower speeds is lost at higher speeds, due to limited dc bus voltage. A listing of the controller software with adequate comments and the circuit diagrams are appended.
Master of Science

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Deng, Xu. "A drive system for six-phase switched reluctance motors." Thesis, University of Newcastle upon Tyne, 2017. http://hdl.handle.net/10443/3921.

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Switched Reluctance Motor (SRM) drives have been developed for decades. They are advantageous because of their simple structure, low manufacturing cost, high system reliability and wide speed range. They are one of the types of traction drive system employed for electric vehicles and are also used in the aviation industry. In this thesis, a novel six-phase SRM is selected to be the research object. Two converters with fewer switches are proposed which are a circle converter and a circle converter with extra diodes. Conventional control methods are modified to suit the selected SRM and applied with the proposed converters. Simulation results are compared with the conventional Asymmetric Half Bridge (AHB) converter and show that the proposed converters can work effectively as the conventional converter. In order to further reduce the torque ripple of the six-phase SRM, a Direct Torque Control (DTC) method is developed and applied to the AHB converter and the proposed converters. Simulation results show that the DTC method can reduce torque ripple throughout the whole speed range compared with traditional control methods. The effects of winding connections on performance of the six-phase SRM are discussed to find the optimum winding connection type. The effects are first studied from a single-phase excitation. Subsequently five different winding connection types are proposed and analysed. Both torque performance and mutual inductance distribution are discussed through multi-phase excitation simulations and an optimum winding connection type is proposed. A 4.0kW SRM test rig is built and commissioned in Newcastle University. Experimental results validate the optimum decoupled winding connection type, demonstrate the feasibility of the proposed circle converters, and verify the highly effective torque ripple reduction performance of the DTC method throughout the whole speed range.

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Karacan, Cuneyt. "Comparison Of Performance Of Switched Reluctance Motors, Induction Motors And Permanent Magnet Dc Motors." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12604925/index.pdf.

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Since most of the electrical energy is consumed by the electrical motors, it is necessary to use the electrical energy as efficient as possible. Throughout this study four different types of motors (induction motor, permanent magnet radial flux DC motor, permanent magnet axial flux DC motor, switched reluctance motor) are considered and compared based on their torque per unit volume and speed performance comparison. Torque per unit volume equations are obtained for each of the motor, related to quantities such as magnetic flux density and electric loading and the speed performances are compared by using a washing machine application, which has a wide speed range. As a result of this study torque per unit volume and speed performance of each of these four types of motors are obtained and motors of different types are evaluated due to their torque per motor volume, torque per ampere, efficiency and etc. over a wide speed range to have an idea about the applications of these motors.

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Hudson, Christopher Allen. "Single-Phase, Single-Switch, Sensorless Switched Reluctance Motor Drive Utilizing a Minimal Artificial Neural Net." Thesis, Virginia Tech, 2005. http://hdl.handle.net/10919/34735.

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Artificial Neural Networks (ANNs) have proved to be useful in approximating non- linear systems in many applications including motion control. ANNs advocated in switched reluctance motor (SRM) control typically have a large number of neurons and several layers which impedes their real time implementation in embedded sys- tems. Real time estimation at high speeds using these ANNs is diffcult due to the high number of operations required to process the ANN controller. An insuffcient availability of time between two sampling intervals limits the available computation time for both processing the neural net and the other functions required for the motor drive. One ideal application of ANNs in SRM control is rotor position estimation. Due to reliability issues, elimination of the rotor position sensors is absolutely required for high volume, high speed and low cost applications of SRM's. ANNs provide a means by which drive designers can implement position sensorless drive technology that is both robust and easily implemented. It is demonstrated that a new and novel ANN configuration can be implemented for accurate rotor position estimation in a sensorless SRM drive. Consisting of just 4 neurons, the neural estimator is the smallest of its kind for SRM rotor position estimation. The breakthrough that provided the reduction was the addition of a non- linear input. Typical input spaces for SRM position neural estimators consist of both current,and fux-linkage. The neural network was trained on-line using these inputs and a third, non-linear input provided by a preprocessed product of the two typical inputs.
Master of Science

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Sourirajan, Aravind. "Computer aided design of a switched reluctance motor." Thesis, Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/53720.

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In recent years, the product life cycle has decreased and demands for new products have emerged due to competition, modern industrial needs and rapidly changing technology. This has necessitated changes in design, development and manufacturing processes to improve the quality and efficiency and to reduce the cost. Computer Aided Design (CAD) helps to meet this challenge both in the design evaluation and product design stages. This thesis contains the development of an interactive software for the optimal design of a motor intended for variable speed applications. The use of finite element analysis methods is proposed as an indispensable part of the CAD system for electrical machine design. An illustration of the method is presented for the design of a switched reluctance motor.
Master of Science

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Wallace, Richard S. Jr. "Design and control of switched reluctance motors to reduce torque ripple." Diss., Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/13874.

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Zhan, Yiju. "A high performance switched reluctance motor drive for electric vehicles /." Hong Kong : University of Hong Kong, 1998. http://sunzi.lib.hku.hk/hkuto/record.jsp?B19833945.

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Michaelides, Alexandros M. "The design of switched reluctance motors for efficient energy conversion." Thesis, University of Warwick, 1994. http://wrap.warwick.ac.uk/36213/.

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A new switched reluctance motor configuration is proposed, in which the windings are arranged to encourage short magnetic flux paths within the motor. Short flux path motor configurations have been modelled extensively using electromagnetic finite element analysis. It is demonstrated that short flux paths significantly reduce the MMF required to establish the B-field pattern in a motor; as a result copper losses are reduced. In addition, hysteresis and eddy current losses are decreased as the volume of iron in which iron losses are generated is reduced. Short flux paths are formed when two adjacent phase windings, configured to give neighbouring stator teeth opposite magnetic polarity, are simultaneously excited. In order to accurately model short flux path machines, a thorough electromagnetic analysis of doubly excited systems is adopted. The proposed modelling theory forms the basis for design considerations that can optimise the performance of the 4-phase and 5-phase switched reluctance motors. The electromagnetic theory of doubly excited systems is used in conjunction with a dynamic simulation program, written in Turbo Pascal, to design a 5-phase switched reluctance motor that exploits the advantages of short flux paths. Test results from the constructed prototype confirm that short flux paths significantly improve the efficiency of the switched reluctance motor. The 5-phase prototype achieves higher efficiency than all known prior art switched reluctance motors and industrial induction machines constructed in the same frame size. At the [1300rpm, 20Nrn] operating point the efficiency of the 5-phase drive was measured to be 87%. The corresponding motor efficiency was in excess of 89.5%.

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Blake, R. J. "The control of switched reluctance motors for battery vehicle applications." Thesis, University of Nottingham, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.371273.

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Sitsha, Lizo M. M. "Design of tapered and straight stator pole switched reluctance machines." Thesis, Stellenbosch : Stellenbosch University, 2000. http://hdl.handle.net/10019.1/51678.

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Thesis (MEng)--University of Stellenbosch, 2000.
ENGLISH ABSTRACT: This thesis deals with the design and optimisation of medium power traction switched reluctance machines with tapered and straight stator poles. Only the prototype of the tapered stator pole machine is constructed and evaluated in this study. A non-commercial finite element package is used in the design and optimisation of the machines. The finite element method is applied directly in the optimisation procedure to optimise the design of the machines in multi-dimensions. The lumped circuit analysis method is used only for the purpose of verifying some of the finite element calculated. It is not used in the optimisation procedure. The performance characteristics of the tapered and straight stator pole machines are compared and discussed and the tapered stator pole machine is found to have better torque performance. Also the calculated and measured static torque versus rotor position characteristics of the tapered stator pole machine are compared and discussed.
AFRIKAANSE OPSOMMING: Die tesis beskryf die ontwerp en optimering van medium drywing trekkrag geskakelde reluktansie masjiene met tapse en reguit stator pole. Slegs 'n prototipe van die tapse stator pool masjien is gebou en geëvalueer. Die masjiene is ontwerp en geoptimeer met behulp van 'n nie-kommersiële eindige element metode pakket. Die eindige element metode is direk in die optimerings algoritme gebruik vir die optimering van die masjiene in multi-dimensies. Die gekonsentreede parameter stroombaananalise is slegs gebruik om sommige van die eindige element berekenings te verifeer. Die vermoës van die tapse en reguit stator pool masjiene is vergelyk en bespreek. Die resultate toon dat die tapse stator pool masjien se draaimoment vermoë beter is as die van die reguit stator pool masjien. Die berekende en gemete statiese draaimoment teenoor rotorposisie van die tapse stator pool masjien is ook vergelyk en bespreek.

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詹宜巨 and Yiju Zhan. "A high performance switched reluctance motor drive for electric vehicles." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1998. http://hub.hku.hk/bib/B31238026.

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Thompson, Kenneth. "Position estimation in a switched reluctance motor using recursive least squares." Thesis, University of Newcastle Upon Tyne, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366575.

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Bedingfield, Ralph Andrew. "Development of CAE system for switched motor drive systems." Thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-10312009-020029/.

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Pop, Adrian-Cornel. "Switched reluctance motors for electric vehicle propulsion: optimal machine design and control." Doctoral thesis, Universite Libre de Bruxelles, 2012. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/209569.

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Chandramouli, G. "Design of a PC based Data Acquistion System for a Switched Reluctance Motor." Thesis, Virginia Tech, 1988. http://hdl.handle.net/10919/44777.

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The Switched Reluctance Motors(SRM) have gained considerable attention in the variable speed drive market mainly due to the simple construction of the motor and the possibility of developing low cost converters and controllers. As these machines are under development, a considerable amount of research effort is directed to the experimental performance evaluation of the SRM drives. System efficiency, electromagnetic torque, torque ripple, output and losses are some of the required measurements.
Master of Science

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Yalciner, Levent Burak. "A Software For Analysis And Design Optimization Of Switched Reluctance Motor." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/2/12605060/index.pdf.

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In this study, development of software, which can analyze and optimize an SRM by accurately calculating its performance, is aimed. Existing methods in the literature are investigated. Some studies for the calculation of performance use 2D field solutions and are known to be accurate
however, using field solutions is not feasible for the optimization purpose. So, a method based on a set of normalized permeance and force data are chosen for prediction of magnetizing characteristics. Selected methods are programmed into the software with a user friendly interface. The results from the software are compared with test results from an existing motor. It is found that the accuracy of the predictions is not acceptable if the effect of end winding leakage flux is not accounted for. An approach is proposed for accounting the end winding leakage. The software is modified accordingly. In this case, the results obtained are found to have good accuracy, compared with measurements. The SR motor design optimization problem is treated as a constrained wieght optimization problem. This problem is converted to an unconstrained optimization problem, by using the Augmented Lagrangian method. To decrease the computation time of some of the performance calculation algorithms, some modifications are made. These are described in the related sections. The derivatives for the optimization process are numerically calculated. The accuracy of the performance calculation is once again verified against test results at this stage. The optimization software is then used to optimize the design of an SR motor for a washing machine application. The results obtained are discussed.

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Rasmeni, Sibusiso Wiseman. "Simulation of the switched reluctance machine under single pulse mode operation." Thesis, Stellenbosch : Stellenbosch University, 2003. http://hdl.handle.net/10019.1/53590.

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Thesis (MScEng)--University of Stellenbosch, 2003.
ENGLISH ABSTRACT: Two distinct simulation methods have been developed to simulate the single and the multi-phase excited current waveforms of the switched reluctance machine (SRM) under single pulse mode operation. These simulation methods are explained and evaluated in this thesis. A non-commercial finite element package that takes the SRM's nonlinear magnetic property into account is used in this regard. The simulation program uses the finite element solution directly during the simulation. Both simulation methods have been investigated in terms of result and total simulation time. In this investigation it is shown how feasible the simulation methods will be with the next generation of fast computers. The factors affecting the simulated current waveforms of the SRM under single pulse mode operation are investigated in detail in this thesis. With these factors taken into account, the measured and simulated multi-phase current waveforms are compared with each other and discussed.
AFRIKAANSE OPSOMMING: Twee verskillende simulasie metodes is ontwikkel om die enkel- en multi-fase stroomgolfvorms van die geskakelde reluktansiemasjien (GRM) onder enkelpulsmodus-werking te simuleer. In hierdie tesis word hierdie simulasie metodes verduidelik en geëvalueer. 'n Nie-kommersiële eindige element pakket wat die nielinieêre magnetiese eienskap van die GRM in ag neem is in hierdie verband gebruik. Die simulasie program gebruik die eindige-element oplossing direk gedurende die simulasie. Beide simulasie metodes is ondersoek in terme van resultaat en simulasietyd. In hierdie ondersoek word getoon hoe uitvoerbaar hierdie tipe simulasie metodes gaan wees met die volgende hoë spoed generasie rekenaars. Die faktore wat die gesimuleerde stroomgolfvorms van die GRM onder enkelpulsmodus-werking beïnvloed word deeglik in hierdie tesis ondersoek. Met hierdie faktore in ag geneem word die gemete en gesimuleerde multi-fase stroomgolfvorms met mekaar vergelyk en bespreek.

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Faiz, J. "Computational methods for the design of multi-tooth-per-pole switched reluctance motors." Thesis, University of Newcastle Upon Tyne, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.383963.

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Peng, Wei. "Fast Modelling, Torque-Ripple-Reduction and Fault-Detection Control of Switched Reluctance Motors." Doctoral thesis, Universite Libre de Bruxelles, 2019. https://dipot.ulb.ac.be/dspace/bitstream/2013/285757/5/contratWP.pdf.

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As the world moves towards a cleaner and greener future, electrical machines for various industrial purposes and transport applications have gained a lot of attention. Permanent magnet synchronous machines (PMSMs) are usually the solution for electric vehicle (EV) applications thanks to their high efficiency, compactness and high-power density. On the downside, although the price of rare-earth materials has recovered close to historical levels, concerns still remain and the questions on the environmental sustainability of these materials have also been raised, which has encouraged the researchers to consider rare-earth-free machines.The switched reluctance machine (SRM) is one of the competitive alternatives, thanks to the simple and robust construction, high reliability and inherent fault tolerance capability. However, it has a bad reputation when it comes to torque ripple and acoustic noise. And the highly nonlinear characteristic brings much difficulty to routine design purposes and machine optimisation.Therefore, some of the above mentioned problems are addressed - a torque-ripple-reduction, reliable and low-cost system of SRMs is presented in this thesis. Firstly from the modelling point of view, a combined magnetic equivalent circuit (MEC) and finite element (FE) model of SRMs is developed for fast characterization the nonlinear behavior. Secondly from the control point of view, various torque-ripple reduction techniques are implemented and compared. Moreover, a minimal current sensing strategy with enhanced fault-detection capability is proposed and validated experimentally. It requires two current sensors, to replace the phase current sensors, with no additional devices for fault detection, to achieve a more compact and low-cost drive. Finally from the reliability point of view, an interturn short-circuit fault detection method and a rotor position estimation approach are investigated and validated experimentally, which leads to a more reliable system.
Doctorat en Sciences de l'ingénieur et technologie
info:eu-repo/semantics/nonPublished

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Larsson, Martin. "Electric Motors for Vehicle Propulsion." Thesis, Linköpings universitet, Fordonssystem, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-103907.

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This work is intended to contribute with knowledge to the area of electic motorsfor propulsion in the vehicle industry. This is done by first studying the differentelectric motors available, the motors suitable for vehicle propulsion are then dividedinto four different types to be studied separately. These four types are thedirect current, induction, permanent magnet and switched reluctance motors. Thedesign and construction are then studied to understand how the different typesdiffer from each other and which differences that are of importance when it comesto vehicle propulsion. Since the amount of available data about different electricmotors turned out to be small a tool was developed to use for collecting data fromthe sources available which can be for instance product sheets or articles with informationabout electric motors. This tool was then used to collect data that wasused to create models for the different motor types. The created motor models foreach motor type could then be used for simulating vehicles to investigate how thespecific motor is suited for different vehicles and applications. The work also containsa summary of different electric motor comparison studies which makes it agood source of information during motor type selection in the process of designingan electric vehicle.

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Bizkevelci, Erdal. "A Control Algorithm To Minimize Torque Ripple And Acoustic Noise Of Switched Reluctance Motors." Phd thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/2/12609866/index.pdf.

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Despite its simple construction, robustness and low manufacturing cost, the application areas of SR motors are remained limited due to the high level of acoustic noise and torque ripple. In this thesis work, two different type of controllers are designed and implemented in order to minimize the acoustic noise and torque ripple which are considered as the major problems of SR motors. In this scope, first the possible acoustic noise sources are investigated. A sliding mode controller is designed and implemented to reduce the shaft torque ripple which is considered as a major source of acoustic noise. The performance of the controller is experimentally tested and it is observed that especially in low speed region reduction of torque ripple is significant. The torque ripple minimization performance of the controller is also tested at different speeds and the acoustic noise levels are recorded simultaneously. Comparing the noise mitigation with the noise reduction the correlation between the acoustic noise and shaft torque ripple is investigated. The results obtained from this investigation indicated that the torque ripple is not a major source of acoustic noise in SR motors. After this finding, radial force which is the other possible acoustic noise source of SRM is taken into consideration. The effects of control parameters on radial force and the motor efficiency are investigated via simulations. With the intuition obtained from this analysis, a switching angle neuro-controller is designed to minimize the peak level of radial forces. The performance of the mentioned controller is verified through noise records under steady state conditions. Regarding to the radial force simulations and the acoustic noise measurements, it is deduced that the radial force is the major source of acoustic noise. On the other hand, another controller is designed and implemented which increases the average torque per ampere value in order to increase the efficiency of the motor. It is seen that this controller has a good effect on increasing the efficiency but does not guarantee to operate at maximum efficiency.

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Mitra, Rakesh. "Torque Ripple Minimization of Switched Reluctance Motors Using Speed Signal Based Phase Current Profiling." University of Akron / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=akron1415968334.

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Cheok, Adrian David. "A new fuzzy logic based sensorless rotor position estimation algorithm for switched reluctance motor drives /." Title page, abstract and contents only, 1998. http://web4.library.adelaide.edu.au/theses/09PH/09phc5184.pdf.

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Essah, David N. "New modeling techniques for power electronics based systems with application to switched reluctance drives /." free to MU campus, to others for purchase, 1999. http://wwwlib.umi.com/cr/mo/fullcit?p9962521.

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Petrus, Vlad. "Switched reluctance motors for electric vehicle propulsion: comparative numerical and experimental study of control schemes." Doctoral thesis, Universite Libre de Bruxelles, 2012. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/209575.

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Policies to reduce emissions from transportation are implemented by different World and European

associations. Personal and freight transportation is one of the key contributors in GHG

emissions, being the second biggest GHG emitter after energy sector in the European Union.

The policies to reduce emissions from transportation are focusing on the optimization of the efficiency

of the existing vehicles, the development of new sustainable fuels and propulsion systems

and the electrification of the vehicles

The continuously increasing price of the permanent magnets and the shortage of rare earths

demand the finding of alternatives for the permanent magnet synchronous machines which is

currently the leading technology in several domains as hybrid and full electric propulsion and

wind turbines due to their best overall performances.

The good efficiency and the large constant power-speed ratio in addition to low the cost, high

reliability and fault-tolerance make the SRM a candidate with real chances on the market of

vehicle propulsion. The main drawbacks of the SRM related to the torque ripple, noise and

vibration make the research object in R&Ds all over the world.

This thesis is focused on the development of an efficient and robust switched reluctance drive

which can be integrated in a hybrid dive train or can be solely used for electric vehicle traction.

To achieve this goal, various instantaneous and average torque control techniques are implemented

and compared. A converter is designed, built and integrated on a test bench which

allows testing SRMs for vehicle propulsion. An investigation on noise production in SRDs ends

the thesis.
Doctorat en Sciences de l'ingénieur
info:eu-repo/semantics/nonPublished

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Khalil, Ahmed. "Modeling and Analysis of Four Quadrant Sensorless Control of a Switched Reluctance Machine Over the Entire Speed Range." University of Akron / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=akron1123088518.

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Mathis, Allen MATHIS. "Modal analysis of electric motors using reduced-order modeling." University of Akron / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=akron1462898318.

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Fingers, Richard Todd. "Creep Behavior Of Thin Laminates Of Iron-Cobalt Alloys For Use In Switched Reluctance Motors And Generators." Diss., Virginia Tech, 1997. http://hdl.handle.net/10919/30588.

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The United States Air Force is in the process of developing magnetic bearings as well as an aircraft Integrated Power Unit and an Internal Starter/Generator for main propulsion engines. These developments are the driving force behind a new emphasis on high temperature, high strength magnetic materials for power applications. Analytical work, utilizing elasticity theory, in conjunction with design requirements, indicates a need for magnetic materials to have strengths in excess of 80 ksi up to about 1000 degrees F. It is this combination of desired material characteristics that is the motivation for this effort to measure, model, and predict the creep behavior of such advanced magnetic materials. HipercoÂ® Alloy 50HS, manufactured by Carpenter Technology Corporation, is one of the leading candidates for application and is studied in this effort by subjecting mechanical test specimens to a battery of tensile and creep tests. The tensile tests provide stress versus strain behaviors that clearly indicate: a yield point, a heterogeneous deformation described as LuÌ ders elongation, the Portevin-LeChatelier effect at elevated temperatures, and, most often, a section of homogeneous deformation that concluded with necking and fracture. Creep testing indicated two distinct types of behavior. The first was a traditional response with primary, secondary and tertiary stages, while the second type could be characterized by an abrupt increase in strain rate that acted as a transition from one steady state behavior to another. This second linear region was then followed by the tertiary stage. The relationship between the tensile response and the creep responses is discussed. Analyses of the mechanical behavior includes double linear regression of empirically modeled data, scanning electron microscopy for microstructural investigations, isochronous stress-strain relations, and constant strain rate testing to relate the tensile and creep test parameters. Also, elastic and creep deformation analyses are done, which incorporate material property data and material constants determined along with stress and displacement profiles for a specific Air Force design configuration.
Ph. D.

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Jackson, Terry W. "Analysis and design of a novel controller architecture and design methodology for speed control of switched reluctance motors." Thesis, This resource online, 1996. http://scholar.lib.vt.edu/theses/available/etd-11072008-063133/.

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Bernard, Pierre Jean Georges. "Optimisation of rotor pole shape of switched reluctance motors and the effect of rotor eccentricity on unbalanced magnetic pull and noise emissions." Thesis, University of Sussex, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.360550.

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Neupane, Nirdesh. "Comparison of Switched Reluctance Motor and Double Stator Switched Reluctance Motor." ScholarWorks@UNO, 2018. https://scholarworks.uno.edu/td/2564.

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This thesis is concerned with the design and analysis of Switched Reluctance Motor (SRM) and its improved structure Double Stator Switched Reluctance Motor (DSSRM). Three configurations of SRM viz. Inner Stator, Outer stator and Double Stator are designed and simulated in ANSYS Maxwell Suite. Design parameters are chosen by aiming optimum performance of motor after literature review and analytical study of the motor. SRM is not a line start machine, so power converter circuit is required to excite the motor. Without proper switching of current, desired torque is not obtained in SRM. The converter circuit and switching unit is built in Maxwell Circuit Editor Tools. Both magnetostatics and transient analysis is performed to investigate motion torque, torque ripple, normal force and radial force. A good comprehensive comparison of three different types of SRMs based on their torque profile and force densities is presented. Simulation performed verified better performance of DSSRM.

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