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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 futursIn 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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Sadri, Seyed Mohammad Reza. "Variable reluctance motor and drive systems." Thesis, View thesis, 1995. http://handle.uws.edu.au:8081/1959.7/427.
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This thesis investigates the development of a machine which is termed as singly salient reluctance (SSR) motor and its drive system. The stator of SSR motor is identical to that of a conventional induction motor or any other ac machine. Its rotor has salient poles with internal flux barriers or flux guides. This research covers the detailed designs of the SSR motors and their magnetic circuit analysis using finite element method (FEM). The parameters which are important for designing the SSR motor are investigated. This investigation resulted in designs which have low manufacturing cost as well as high torque per ampere, efficiency and power factors. This thesis also researches the different drive system for the SSR motor. The SSR motor is tested as a variable speed drive with closed loop control and supplied with dc source. Therefore for this purpose a controller system is designed and built. In addition, the SSR motor supplied by ac source using open loop control is also tested for synchronous operation. Some of the proposed designs are built and their performance compared with their predicted analysis. The SSR motors showed a competitive performance compared with equivalent induction motor in both efficiency and power factor. However the validity of the theoretical designs is assessed by comparing them with experimental results. Quite good agreement between experimental and theoretical evaluations has been achieved. In addition, suggested further improvements for SSR motors and drive systems are discussed.
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Sadri, Seyed Mohammad Reza. "Variable reluctance motor and drive systems /." View thesis, 1995. http://library.uws.edu.au/adt-NUWS/public/adt-NUWS20030716.150935/index.html.
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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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Metwally, H. M. B. "Multi-tooth per pole variable reluctance motors." Thesis, University of Newcastle Upon Tyne, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.370148.
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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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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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Hanekom, Alwyn Nicolaas. "A torque ripple analysis on reluctance synchronous machines." Thesis, Cape Peninsula University of Technology, 2006. http://hdl.handle.net/20.500.11838/1145.
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Thesis MTech(Electrical Engineering))--Cape Peninsula University of Technology, 2006Reluctance Synchronous Machines (RSM) have, due to their rotor geometry, an inherently high torque ripple. This torque ripple is defined as the deviation of the minimum and maximum torque from the average value. It is unwanted as it indicates uneven pull on the rotor causing deformation of it and hence different air-gaps along the rotor circumference as well as acoustic noise. In applications such as power steering, robotics and radar positioning systems where high precision movement is vital, oscillating torque will lead to the malfunction of these devices and therefore suppressed the use and development of RSMs. Unlike the Induction machine (IM), the RSM has no copper losses in the rotor, which reduces the operating temperature significantly. With the development of electronic drives the quality of the output torque could be improved by means of accurate current- and flux space phasor control methods with much success and made the RSM a possible replacement for the IM. However, reducing torque ripple by means of purely geometrical changes is still a challenge to the machine designer. This thesis will focus on the reduction of torque ripple while leaving the average torque relatively unchanged by changing the rotor geometry. The rotor changes will take place by means of flux barriers and cut-outs while the stator has either semi-closed slots or magnetic wedges. In this work rotor structures with equal harmonic magnitudes but their angles 1800 apart. will be combined to form one machine and identify how torque harmonics respond. The change in average torque and power factor will be evaluated with all geometrical changes made to these machines throughout this work.
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Mvungi, Nerey Henry. "Sensorless rotor position detection for variable reluctance motors." Thesis, University of Leeds, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329040.
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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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Donaghy-Spargo, Christopher Michael. "Synchronous reluctance motors with fractional slot-concentrated windings." Thesis, University of Newcastle upon Tyne, 2016. http://hdl.handle.net/10443/3486.
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Today, high efficiency and high torque density electrical machines are a growing research interest and machines that contain no permanent magnet material are increasingly sought. Despite the lack of interest over the last twenty years, the permanent magnet-free synchronous reluctance machine is undergoing a revival and has become a research focus due to its magnet-free construction, high efficiency and robustness. They are now considered a potential future technology for future industrial variable speed drive applications and even electric vehicles. This thesis presents for the first time a synchronous reluctance motor with fractional slot-concentrated windings, utilizing non-overlapping single tooth wound coils, for high efficiency and high torque density permanent magnet-free electric drives. It presents all stages of the design and validation process from the initial concept stage through the design of such a machine, to the test and validation of a constructed prototype motor. The prototype machine utilizes a segmented stator core back iron arrangement for ease of winding and facilitating high slot fill factors. The conventional synchronous reluctance motor topology utilizes distributed winding systems with a large number of stator slots, presenting some limitations and challenges when considering high efficiency, high torque density electrical machines with low cost. This thesis aims to present an advancement in synchronous reluctance technology by identifying limitations and improving the design of synchronous reluctance motors through development of a novel machine topology. With the presented novel fractional slot concentrated winding machine design, additional challenges such as high torque ripple and low power factor arise, they are explored and analysed - the design modified to minimise any unwanted parasitic effects. The electrical and electromagnetic characteristics of the developed machine are also explored and compared with that of a conventional machine. A novel FEA post-processing technique is developed to analyse individual air-gap field harmonic torque contributions and the machines dq theory also modified in order to account for additional effects. The developed machine is found to be lower cost, lower mass and higher efficiency than an equivalent induction or conventional synchronous reluctance motor, but does suffer higher torque ripples and lower power factor. The prototype is validated using static and dynamic testing with the results showing a good match with finite element predictions. The work contained within this thesis can be considered as a first step to developing commercial technology based on the concept for variable speed drive applications.
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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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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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Ahmed, Raga. "Performance limits of linear variable reluctance motors in controlled linear motion applications." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/50310.
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Improved actuator point-to-point positioning performance, as measured by settling time, has been demonstrated in the context of manufacturing automation applications such as circuit board assembly and other product-transfer operations. The control objective is to move a single mass in a single axis from a starting position to a target position following the fastest possible motion trajectory while meeting final-position accuracy requirements. The actuator's achievable force that is available for acceleration is the fundamental variable that determines optimal settling time. The actuator technology employed is the linear variable reluctance motor.
Mathematical motor models and simulation programs have been developed to perform several tasks necessary for demonstrating improved actuator performance: (i) optimal commutation under force ripple constraints has been computed to determine ripple-specified force limits and to provide excitation waveforms necessary for force production, (ii) motion profiles for several positioning task scenarios have been generated based on computed ripple-specified force limits, (iii) state space integral position control simulations have been performed to evaluate the degree of success of the proposed relaxation of force ripple constraints in improving settling time and (iv) the computed settling times for positioning tasks have been examined in relation to the copper losses associated with them in order to assess the trade-off.
It has been shown that higher force capability is achieved when force-ripple constraints, which have been customarily emphasized in positioning applications, are relaxed. The higher capability is exploited by adopting faster motion trajectories, which are then imposed under feedback control to achieve faster settling time. Improved force capability with relaxed ripple constraints is demonstrated by generating average force versus speed capability curves under ripple constraints ranging from minimal ripple to unconstrained ripple. Improved positioning performance, with relaxed ripple constraints and without violating the final-position accuracy specification, is demonstrated by computing and comparing settling time for multiple positioning tasks with trajectories based on both extremes of force capability, lowest (no-ripple) and highest (unconstrained-ripple) force limits. The results have been demonstrated for two LVR motor configurations: one motor configuration represents typical (switched) linear and rotary variable reluctance motors while the other exhibits features of both switched and synchronous varieties of variable reluctance motors.
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Aljaism, Wadah A. "Switched reluctance motor : design, simulation and control." Thesis, View thesis, 2007. http://handle.uws.edu.au:8081/1959.7/26494.
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This thesis presents a design method for a switched reluctance (SR) motor to optimise torque production for two types of 3 phase 6/4 poles SRM and 8/6 poles SRM designs. SR motors require precise control to optimise the operating efficiency; two controllers are proposed and built to operate the switched reluctance motor. The primary objectives of this thesis are:
• To investigate the developed torque optimization for switched reluctance (SR) motors as a function of various dimensions e.g. pole arc/pole pitch variation, stator shape variation and rotor shape variation. This investigation is achieved through the simulation using Finite Element Method (FEM), MATLAB/SIMULINK. • The two proposed controllers are designed and built to carry out the experimental testing of SRM. The most versatile SRM converter topology is the classic bridge converter topology with two power switches and two diodes per phase. The first controller consists of a Programmable Logic Controller (PLC) and the classic bridge converter, this Programmable Logic Controller uses a simple language (ladder language) for programming the application code, reliable, and contains timers. The second controller consists of a cam positioner, encoder and the classic bridge converter, this cam positioner is easy to be programmed, high-speed operation, and this cam positioner has 8 outputs. This thesis is organized as follows: Chapter 1 describes the background, the present and future trends for the SRM. This chapter shows the design, control, finite element analysis, fuzzy logic control the for a switched reluctance (SR) motor (literature review). Chapter 2 describes the theory and principle of finite element method, as applied to SR motors. Chapter 3 describes the simulation results for serious of switched reluctance motor designs by changing (_) rotor pole arc / pole pitch ratio, and (_) stator pole arc / pole pitch ratio, for 3 Phase, 6/4 Poles SRM and 4 Phase, 8/6 Poles SRM. The results are obtained through finite element method (FEM) and MATLAB-SIMULINK. Chapter 4 describes the theory of fuzzy logic controller (FLC). This chapter shows the simulation results for the FLC. Chapter 5 describes the proposed programmable logic controller (PLC), and associated hardware and software. The proposed programmable logic controller produces lower speed. The cam positioner controller produces higher speed; the experimental results for both controllers are presented and discussed. Chapter 6 describes the summary of results from earlier chapters to draw the final conclusion for the thesis. The recommendations for further research are also discussed. Appendix A describes the program code for the PLC controller. Appendix B contains a CD of photos album, video clips for the PLC controller and cam positioner controller. Appendix C shows the list of the published papers by the author, extracted from this thesis.
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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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Aggarwal, Rakesh. "Computer aided design techniques for variable-reluctance stepping motors." Thesis, University of Cambridge, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.292938.
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Marvelly, J. D. "Position encoderless self synchronisation of variable reluctance stepping motors." Thesis, University of Canterbury. Engineering, 1987. http://hdl.handle.net/10092/6463.
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The principal application of stepping motors to date is in low power open loop positioning systems. It is widely known that self synchronisation offers a significant improvement in dynamic performance in addition to step integrity. The necessary positional feedback is traditionally provided by a position encoder. However the fitting of such a device is usually expensive and inconvenient.
Previous analyses of stator current waveforms of motors driven from the conventional L/R drive have revealed rotor position dependant characteristics which can be used to provide self positional feedback. A variety of different schemes using both on and off phases have been proposed in the literature. Successful self synchronisation utilising some of these characteristics has been reported for multiple stack variable reluctance stepping motors.
When the active suppression drive is used, the variable reluctance stepping motor offers high specific output and efficiency making it a contender in controlled speed drive applications as well. Lower manufacturing cost makes the single stack motor additionally attractive.
A single stack stepping motor driven under self synchronised control from self positional feedback and using active suppression drives is potentially an efficient cost effective drive offering precision speed and position control. The single stack motor has significant mutual inductances between phases. This coupling considerably complicates the task of obtaining self positional feedback, especially when active suppression drives are used.
This research investigates the suitability of the single stack variable reluctance stepping motor to position encoderless self synchronisation when driven by an active suppression drive and chopper current limiting.
An algorithm for obtaining the necessary self positional feedback has been developed and the equipment necessary to implement it has been designed and constructed. Certain characteristics which restrict the performance of the algorithm have been observed during operation. These characteristics have been explained in terms of the significant mutual inductances between phases inherent in the single stack motor.
A linear model of the on and de-energising phase currents has been developed and implemented numerically. The results have been used to generate theoretical torque vs speed plots. These plots show good agreement with the measured performance.
A linear model of the self positional feedback algorithm has been developed to further the analytical understanding of the advances made experimentally. The numerical solutions identify the cause of the performance restrictions and simulate the nature of the observed self positional feedback characteristics closely.
A suggestion is made for continuing research which is believed likely to yield significant results.
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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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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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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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Wung, Peter Yu-Pu. "Operating point dependent modeling of synchronous reluctance motors and its implication on vector controlled motor performance." Diss., Georgia Institute of Technology, 1993. http://hdl.handle.net/1853/15042.
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Pei, Jianfa. "Methodology of design and analysis of variable-reluctance spherical motors." Diss., Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/18197.
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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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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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Cameron, Derrick E. (Derrick Eugene). "Origin and reduction of acoustic noise in variable-reluctance motors." Thesis, Massachusetts Institute of Technology, 1990. http://hdl.handle.net/1721.1/57729.
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Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1990.Includes bibliographical references (leaves 116-118).
by Derrick E. Cameron.
M.S.
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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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Roth, Ronald B. "An experimental investigation and optimization of a variable reluctance spherical motor." Diss., Georgia Institute of Technology, 1992. http://hdl.handle.net/1853/18913.
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Rakgati, Edward Tshitshiri. "Torque Performance of Optimally Designed Multi-Phase Reluctance DC Machines." Thesis, Link to the online version, 2006. http://hdl.handle.net/10019/1174.
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Gurdal, Osman. "Position control of linear reluctance motors by airgap magnetic field sensing." Thesis, University of Sussex, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.358188.
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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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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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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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Zhou, Zhi. "Real-time control and characterization of a variable reluctance spherical motor." Diss., Georgia Institute of Technology, 1995. http://hdl.handle.net/1853/17665.
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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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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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