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1
Merrifield, David Bruce. "Control of the Doubly Salient Permanent Magnet Switched Reluctance Motor". Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/76988.
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The permanent magnet switched reluctance motor (PMSRM) is hybrid dc motor which has the potential to be more effect than the switched reluctance (SRM) and permanent magnet (PM) motors. The PMSRM has a both a salient rotor and stator with permanent magnets placed directly onto the face of common pole stators. The PMSRM is wound like the SRM and can be controlled by the same family of converters. The addition of permanent magnets creates nonlinearities in both the governing electrical and mechanical equations which differentiate the PMSRM from all other classes of electric motors.
The primary goal of this thesis is to develop a cohesive and comprehensive control strategy for the PMSRM so as to demonstrate its operation and highlight its efficiency. The control of the PMSRM starts with understanding its region of operation and the underlying torque production of the motor. The selection of operating region is followed by a both linear and nonlinear electrical modeling of the motor and the design of current controllers for the PMSRM. The electromechanical model of the motor is dynamically simulated with the addition of a closed loop speed controller. The speed controller is extended to add an efficiency searching algorithm which finds the operating condition with the highest efficiency online.Master of Science
2
Kim, Jaehyuck. "Variable-Speed Switched Reluctance Motor Drives for Low-Cost, High-Volume Applications". Diss., Virginia Tech, 2010. http://hdl.handle.net/10919/77320.
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Demand for energy-saving variable speed drives in low-cost, high-volume appliances has increased due to energy and environmental concerns and hence the need to comply with new regulations. Switched reluctance motor (SRMs) have been considered by many as attractive alternatives for brush commutated motors or permanent magnet brushless dc motors (PMBDCMs) in such cost-sensitive applications. The SRMs' unique features such as simple and fault-tolerant structure and unidirectional flow of their phase currents endow them with the possibility of various configurations on both machine and converter topologies for different applications. In the present study, three different variable-speed motor drive systems are proposed, studied, and implemented for their deployment in low-cost, high-volume applications with the power rating of 1.5kW or less. Two different two-phase SRMs and three different power converters are employed to realize three different low-cost drive systems. The first drive system is realized using a novel converter requiring only a single-controllable switch and an asymmetric two-phase 8/4 SRM capable of self-starting and four-quadrant operation. The second drive system is realized using another novel converter requiring two controllable switches, that way to achieve better control and utilization of the asymmetric 8/4 motor. The target applications for both drive systems are low power, low performance drives such as fans, hand tools, small appliances, etc. The third system is realized using a high-speed two-phase 4/2 SRM and a split ac source converter, which is designed for high-speed applications such as vacuum cleaners, ultracentrifuges, etc. The control and design aspects for each drive system are studied. Selection of optimal firing angles and optimal number of winding turns are also investigated. All of the drive systems are first demonstrated on the position sensor-based speed-control scheme. To make the drive system even more cost-competitive, operation without the position sensor using the novel parameter insensitive sensorless control scheme is proposed and implemented. Concept, analysis, simulation, and experimental verification of the proposed sensorless scheme are discussed in detail.Ph. D.
3
Lee, Cheewoo. "Analysis and Design of a Novel E-Core Common-Pole Switched Reluctance Machine". Diss., Virginia Tech, 2010. http://hdl.handle.net/10919/77319.
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In this dissertation, a novel two-phase switched reluctance machine (SRM) with a stator comprised of E-core structure having minimum stator core iron is presented for low-cost high-performance applications. In addition, three new magnetic structures for the E-core SRM comprising two segmented stator cores or a monolithic stator core are proposed for good manufacturability, mechanically robustness, ease of assembly, and electromagnetic performance improvement. Each E-core stator in the segmented structure has three poles with two small poles at the ends having windings and a large center pole containing no copper windings. The common stator pole at the centers in the segmented E-core is shared by both phases during operation. Other benefits of the common poles contributing to performance enhancement are short flux paths, mostly flux-reversal-free-stator, constant minimum reluctance around air gap, and wide pole arc equal to one rotor pole pitch. Therefore, two additional common poles in the monolithic E-core configuration are able to significantly improve efficiency due to more positive torque and less core loss by the unique design. Using a full MEC analysis, the effect of the common-pole structure on torque enhancement is analytically verified. Efficiency estimated from the dynamic simulation is higher by 7% and 12% at 2000 rpm and by 3% and 7 % at 3000 rpm for the segmented and single-body SRMs, respectively, compared to a conventional SRM with four stator poles and two rotor poles. The new E-core SRMs are suitable for low-cost high-performance applications which are strongly cost competitive since all the new E-core SRMs have 20% cost savings on copper and the segmented E-core SRMs have 20% steel savings as well. Strong correlation between simulated and experimentally measured results validates the feasibility of the E-core common-pole structure and its performance. A simple step-by-step analytical design procedure suited for iterative optimization with small computational effort is developed with the information of the monolithic E-core SRM, and the proposed design approach can be applied for other SRM configurations as well. For investigating thermal characteristics in the two-phase single-body E-core SRM, the machine is modeled by a simplified lumped-parameter thermal network in which there are nine major parts of the motor assembly.Ph. D.
4
Ha, Keunsoo. "Position Estimation in Switched Reluctance Motor Drives Using the First Switching Harmonics of Phase Voltage and Current". Diss., Virginia Tech, 2008. http://hdl.handle.net/10919/28296.
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Position estimation using only active phase voltage and current is presented to perform high accuracy position sensorless control of a SRM drive. By extracting the amplitude of the first switching harmonic terms of phase voltage and current for a PWM period through Fourier analysis, flux-linkage and position are estimated without external hardware circuitry such as a modulator and demodulator, resulting in increasing cost, as well as large position estimation error produced when the motional back emf is ignored near zero speed. Hence the proposed position estimation scheme covers the entire speed range including the standstill under various loads and it has high resolution information depending on switching frequency. Fourier series and Fast Fourier transform are employed to decompose the phase voltage and current into its first switching harmonic. A two-phase SRM drive system, consisting of an asymmetrical converter and a conventional closed-loop PI current controller, is utilized to validate the performance of the proposed position estimation scheme in comprehensive operating conditions. The estimated values very closely track the actual values in dynamic simulations and experiments. It is shown that the proposed position estimation scheme using Fourier analysis is sufficiently accurate and works satisfactorily at various operating points.
This research also proposes an accurate self-inductance measurement method. In general, when applying circulating currents within the body of a ferromagnetic material under conditions of a time varying magnetic flux, the effects of eddy current losses and resistance changes due to
heating decrease the magnetic field strength and thereby the reduced magnetic field decreases the magnetic flux-linkage of SRM. These losses make a challenge to the measurement of magnetic characteristics of SRM. These motives lead to propose a measurement methodology based on 60 Hz sinusoidal excitation using a variable AC power supply, which provides an alternative to time domain integration approaches for self-inductance or flux-linkage measurement as well as eliminates error arising from thermal and eddy currents effects. The validation of the proposed method is verified with the correlation between the measurement and FEA results of flux-linkage.
Furthermore, this research proposes the solutions for low cost and high efficiency drive systems, consisting of a split AC converter and a two-phase SRM. Its performance is analyzed and verified with experiments at the rated speed under various loads. It is believed that this drive system combined with the proposed position estimation scheme using Fourier analysis is a strong contender to be a low cost motor drive system with single switch per phase having comparable efficiency and acoustic noise level as an asymmetric drive system.Ph. D.
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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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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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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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Lopez, Gabriel Gallegos. "Sensorless control for switched reluctance motor drives". Thesis, University of Glasgow, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.284639.
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Lewin, Paul Leonard. "Microprocessor control of a switched reluctance motor". Thesis, University of Southampton, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.262359.
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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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陳基和 y 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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Clothier, Andrew Charlton. "Switched reluctance motor drives with fully pitched windings". Thesis, University of Newcastle Upon Tyne, 2001. http://hdl.handle.net/10443/831.
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Switched reluctance motors with fully pitched windings are a relatively recent advancementin motor technology having only been in existences ince the early 1990's. They have been shown previously to offer greater torque per unit copper loss, and hence higher torque density, than conventional switched reluctance machines with short pitched windings. Early work by Mecrow and Barrass has demonstrated operation of prototype machines, developed and assessedv arious methods of control strategy, and made some comparisons of machine efficiency and inverter rating. The results presented here build on this early work by, in essence, examining the aspects of machine design, control strategy and inverter topology that affect drive performance and cost. Detailed comparisons of inverter rating and machine efficiency are made under equal conditions with the various methods of excitation that are possible. This is achieved with results from a test rig, including temperature rise tests, and the use of accurate dynamic simulation. The latter is developed to accurately model the motor with its strong mutual coupling between phases, various inverter topologies and the details of the controller such as digital PWM. As a result comparisons between simulated and measured results are shown to be very good. The fundamentals of machine design are examined with a view to optimising the machine for fully pitched windings. Previous work has indicated that good results are achieved when a conventional machine is simply rewound, however it is shown that further improvements can be made. Proposals are made to improve the drive in terms of both machine performance and power electronic rating. A search method is proposed that optimises current waveshape for either maximum torque per unit copper loss, or smooth torque for lowest loss. The method works over the entire speed range, as the rate of change of flux linkage is taken into account. Three alternative power electronic converters are developed, one of which is also particularly suitable for the short pitched winding machine. Aspects of silicon rating, current controllability, and current sensor requirements are discussed.
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Tamjis, Mohamad Rom Bin. "Computation of switched reluctance motor design and performance". Thesis, University of Newcastle Upon Tyne, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.386710.
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Lovatt, Howard Craig. "Switched reluctance motor systems with high dynamic performance". Thesis, University of Leeds, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.343251.
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Ouhab, Boussad. "Optimisation of a cylindrical linear switched reluctance motor". Thesis, University of Leeds, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.419026.
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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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Goradia, Kumar S. "Electronic rotor position sensing of switched reluctance motor". Thesis, Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/52055.
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The Switched Reluctance Motor (hereafter referred to as SRM) requires rotor position information for successful operation. The rotor position, in the present day, is obtained through a mechanical/electrical sensor mounted on the rotor shaft. These transducers are expensive and take additional space on the rotor shaft.
An alternative scheme of rotor position sensing is proposed in this thesis which overcomes the disadvantages of existing position sensors. This is achieved by injecting a high frequency control level signal on the stator windings and measuring the response. The response is an indirect measure of the rotor position.
The principle, design, and implementation of the sensor is described in this thesis. The proposed sensor is inexpensive compared to the available sensors and is expected to find applications in small and medium size SRM drives.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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Dang, Jie. "Switched reluctance machine electromagnetic design and optimization". Diss., Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/53908.
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The objective of this dissertation is to study the switched reluctance machine (SRM) electromagnetic design and optimization. The research of electric machines is mostly driven by the motivation for higher efficiency and lower cost. The demands for high-performance electric machines also come from the development of emerging industries, such as electric vehicles (EV), hybrid electric vehicles (HEV), renewable energy conversion, energy storage and precision manufacturing. The additional requirements for those applications include volume, weight, speed, torque, reliability, fault tolerance capability, etc. The focus of the research effort is on the high speed and high torque applications, where the SRM stands out compared to other types of machines. The conventional design method significantly depends on the designer’s experience, which uses equivalent magnetic circuit models, and therefore the SRM design is not well developed.
A novel SRM electromagnetic design and optimization method is developed, which uses the current-fed FEA simulation as the SRM performance estimation tool. This method serves as the main innovation of this research work. First, the proposed method is applicable to any SRM topologies and dimension, and no detailed modeling of a specific SRM configuration is required in advance. Therefore, an automated SRM design and optimization approach is developed. Secondly, great accuracy of the SRM electromagnetic analysis, e.g. flux density, torque, and current calculation, is achieved by using FEA simulation instead of simplified magnetic circuit approximations. This contribution is particularly significant when considering the poor accuracy of conventional SRM analytical analysis methods, where several assumptions and approximations are used. Lastly, the proposed design method takes the typical SRM control strategy into account, where the excitation current profile is characterized as a trapezoid. This method adapts the flux linkage of the first FEA simulation result to specify the excitation current profile for the second FEA simulation, so the calculated SRM performance in FEA simulation agrees with the measurement on a practical machine.
The proposed SRM design and optimization method is used for a 12/8 SRM rotor design and for a complete 4/2 SRM design. These design examples validate the applicability of the proposed method to different SRM configurations and dimensions. Detailed design steps are presented for both design cases, and the selection of the parametric design variables are also discussed. The optimization results are demonstrated using multi-dimension diagrams, where the optimal design with the highest torque can be easily identified. The FEA simulation results are compared to the experimental results of a fabricated SRM prototype, and good agreement is found.
In addition, a new rotor configuration with a flux bridge is proposed for an ultra high speed SRM design. The primary motivation of this rotor topology is to reduce the windgae losses and the acoustic noise at a high speed of 50,000 rpm. However, care must be taken for the flux bridge design, and the impact of different flux bridge thicknesses to the SRM performance is studied. Meanwhile, the manufacturing difficulties and the mechanical stresses should also be considered when fabricating the flux-bridge rotor. As a result, two SRM prototypes are built, and the two rotors are one without a flux bridge and one with a flux bridge. The prototypes are tested at different speeds (10,000 rpm, 20,000 rpm and 50,000 rpm) respectively, and the experimental results show good agreement with the FEA simulation results.
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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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Panda, Sanjib Kumar. "Indirect rotor position sensing for switched reluctance motor drives". Thesis, University of Cambridge, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.387052.
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Goodman, Andrew Simon. "Direct energy converter controllers for switched reluctance motor operation". Thesis, University of Nottingham, 2007. http://eprints.nottingham.ac.uk/10333/.
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There is increasing demand for simple motor drives offering high reliability and fault tolerance in applications such as the aerospace actuator industry, with the development of `more electric aircraft'. This thesis presents a motor drive employing a switched reluctance motor, the novel single sided matrix converter, and a novel double band hysteresis based control scheme for control of the converter, implemented using a field programmable gate array (FPGA). The single sided matrix converter is a direct energy converter, capable of supplying unidirectional currents from a multiphase AC voltage source. It is suitable for driving motors such as the switched reluctance motor and trapezoidal permanent magnet direct current (PMDC) machine. The use of a direct energy converter removes the DC link energy storage element usually found in switched reluctance motor drives, making practical implementation possible without the use of electrolytic capacitors. This is a requirement for applications in the aerospace industry. Controller implementation without the use of a digital signal processor (DSP) makes application of the converter in the aerospace industry easy as specific DSP approval is not required. Simulations of the converter operation are presented, followed by a description of the practical implementation of the novel converter and control schemes. Practical results demonstrate the reliable operation of the converter, driving both switched reluctance and trapezoidal PMDC machines. The work has been published in three conference papers, presenting both the topology of the drive and the applied control schemes, as well as analysing the fault tolerant capabilities of the drive.
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Rudolph, Benjamin. "Nonlinear Deadbeat Current Control of a Switched Reluctance Motor". Thesis, Virginia Tech, 2009. http://hdl.handle.net/10919/76898.
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High performance current control is critical to the success of the switched reluctance motor (SRM). Yet high motor phase nonlinearities in the SRM place extra burden on the current controller, rendering it the weakest link in SRM control. In contrast to linear motor control techniques that respond to current error, the deadbeat controller calculates the control voltage by the current command, phase current, rotor position and applied phase voltage. The deadbeat controller has demonstrated superior response in three-phase inverter current control, PM motor current control, and other relatively linear control applications. This study will investigate the viability and performance of a deadbeat controller for the highly nonlinear SRM.
The need for an accurate deadbeat control model first motivates the investigation of experimental inductance measurement techniques. A deadbeat control law is then proposed through multiple revisions to demonstrate the benefit of the numerical method chosen to derive the controller and a current predictor that accounts for processor latency and PWM delay. The practical problems of loop delay, feedback noise, feedback filtering, and deadbeat controller parameter sensitivity are investigated by linear analysis, simulation, experimental implementation and nonlinear model analysis. Simulation and implementation verify deadbeat performance and various measures of transient performance are presented. To address the problem of SRM model error the study ends with a brief discussion of adaptive deadbeat control modifications for possible future research.Master of Science
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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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Barnes, Mike. "Power electronics for dual voltage switched reluctance drives". Thesis, University of Warwick, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.265749.
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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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Ooi, Hoe Seng. "Position sensorless switched reluctance motor drive with torque ripple minimisation". Thesis, Imperial College London, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.398085.
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詹宜巨 y 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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Dessouky, Yasser Gaber. "Performance and control of a four phase switched reluctance motor". Thesis, Heriot-Watt University, 1998. http://hdl.handle.net/10399/1265.
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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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Besharati, Maede. "Design of a high speed high power switched reluctance motor". Thesis, University of Newcastle upon Tyne, 2017. http://hdl.handle.net/10443/3878.
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An increase in the price of rare earth materials in 2009 prompted research into alternative motor technologies without permanent magnets. The SRMs have become more of an attractive solution as they are relatively simpler to construct than other machines technologies hence cost effective. Furthermore, the rugged structure of the rotor makes it suitable for high speed operation, if appropriately designed. This thesis investigates the design, analysis and prototype manufacture of an SRM, that from electromagnetic point of view, meets the power output of the PM machine used in the Toyota Prius, although operating at a higher speed of 50,000 rpm. As a result, the required torque is considerably less than an equivalent motor with the same output power running at lower speed, hence this approach allows for much smaller frame sizes. To achieve the required torque, careful choice of stator/rotor tooth combination, coil number of turns and number of phases is needed. Running at high speed, increases the AC copper loss (consisting of skin effect and proximity effects) and iron loss. These shortcomings are extensively discussed and investigated. The mechanical design of this motor requires careful consideration in order to minimise the high mechanical stresses acting upon the rotor, which are due to the high radial forces caused by the centripetal force at high speed. In order to address the mechanical constraints caused by the hoop stress, a structure common to flywheels is applied to the rotor. In this approach, the shaft bore is removed and the laminations are sandwiched together using cheek plates, which are secured using tie rods. The cheek plates have their extending shafts, which consequently will transfer the torque to the rest of the system. The proposed model is analysed for both the electromagnetic and mechanical aspects, successfully demonstrating a promising rotor topology for the design speed. A high speed motor design needs to take into account shaft design, rotor design and bearing design. The high speed operation of the salient rotor gives dramatic rise to the windage loss. These factors are carefully considered in this work and the results are presented.
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Shiwakoti, Rochak. "Design and Analysis of Modular Axial Flux Switched Reluctance Motor". ScholarWorks@UNO, 2019. https://scholarworks.uno.edu/td/2680.
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This thesis presents a new modular structure of the axial flux Switched Reluctance Motor (SRM). The design consists of four stator disks with each adjacent disk rotated 30 degrees apart and four rotor disks connected to a common shaft. The proposed design aims to reduce the unwanted radial force, mitigate the torque ripple, and improve the efficiency. The modular structure distributes the radial force and torque strokes along the axial length of the motor, potentially damping the torque pulsation. In addition, the modular structure would deliver the rating power at a lower current level, reducing the overall ohmic loss. Moreover, if a fault occurs on a motor disk or its control unit, the motor would still operate through other disks, increasing the reliability of the system. To verify the effectiveness of the proposed design, the magneto-static and transient performance of the motor are compared with the conventional single layer structure using 3-D Finite-Element (FE) software tool to see that the proposed motor performs better with lower torque ripple and lower radial force than a conventional single layer structure.
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Lobo, Nimal. "Doubly-Salient Permanent Magnet Flux-Reversal-Free-Stator Switched Reluctance Machines". Diss., Virginia Tech, 2011. http://hdl.handle.net/10919/77978.
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A new hybrid machine having variable reluctance and permanent magnets (PMs) is presented. The machine makes use of the features of a PM machine and variable reluctance machine. The resulting machine is doubly salient and has a structure free of flux reversals. Unlike conventional doubly salient permanent magnet machines (DSPMs), the one proposed in this report is driven by unipolar currents and uses an asymmetric converter which is used to drive switched reluctance machines. The reason to have a new hybrid machine without the drawbacks of conventional flux-reversal-free-stator SRMs and conventional DSPMs is also described.
Conventional doubly salient permanent magnet machines which are driven by alternating currents, do not use reluctance torque and have flux reversals in the stator iron. Homopolar flux at the peak flux density lowers hysteresis and eddy-current loss, since the machine's core operates in only one magnetizing quadrant. Due to unbalanced forces in conventional stator-flux-reversal-free machines, their deployment in industrial and end-user applications has been hindered. The presented hybrid machine has balanced radial forces. Therefore, it maintains the advantages of conventional stator-flux-reversal-free machines while shedding its disadvantages. The proposed machine has significantly increased power density and is more electromechanically efficient than its predecessor. A experimental prototype motor has been designed and built. Its static torque characteristics correlated well with predicted data. Experimental operation of the drive under open loop speed control shows the efficiency to be 90.8% under non-ideal driving conditions. In the current energy conscious environment and market, this motor because of its high efficiency has a significant role in reducing the energy consumption in household, industrial and automotive applications requiring electric motors.Ph. D.
35
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
36
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 accuratehowever, 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.
37
Schramm, Douglas Schirmer. "Control techniques to reduce torque ripple of switched reluctance motor drives". Thesis, Heriot-Watt University, 1993. http://hdl.handle.net/10399/1448.
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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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Wang, Yipeng. "Switched reluctance motor analysis and design for a lunar roving vehicle". Thesis, McGill University, 2013. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=117170.
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In the 21st century, many countries launched robotic space exploration programs, including the Discovery Program in United States, the Chandrayaan Program in India and the Chang'e Program in China. The lack of an atmosphere in outer space makes electric motors the only viable choice for the propulsion systems of a space exploration robot. This thesis proposes the switched reluctance motor (SRM) as a potential candidate for a traction drive. The SRM has a simple and robust rotor structure, an inherent degree of fault tolerance, high efficiency over a wide speed range, and a low cost. This thesis also presents the complete design process of an SRM, starting with its user requirement. Numerical experiments are carried out to analyze both the motoring and the regenerative braking modes of the SRM, and to verify the proposed design. Additionally, evolutionary strategy (ES) single- and multi-objective optimizations are performed to refine the geometric parameters.Au XXIème siècle, beaucoup de pays ont lancé les programmes de robotiques d'exploration spatiale, comprenant le programme Discovery des Etats Unis, Chandrayaan de l'Inde et le programme chinois Chang'e. Le manque d'une atmosphère dans l'espace fait que le moteur électronique est le seul choix viable pour les systèmes de propulsion des robots d'exploration spatiale. Cette thèse propose le moteur à réluctance variable (SRM) comme une candidature potentielle de la traction. Le SRM a une structure simple et robuste de son rotor, une tolérance inhérente de panne, un rendement élevé sur une grande plage de vitesses et un prix bas. Le "design process" complet de SRM est aussi présenté commencé par le besoin de l'utilisateur. Les expériences numériques ont été réalisées afin d'analyser aussi bien le mode de moteur que le mode de freinage par régénération, et de vérifier la conception proposée. De plus, la stratégie évolutive (ES) des optimisations de l'objectif simple ou objectifs multiples a été réalisée pour affiner les paramètres géométriques.
40
Li, Zhen-Ye y 李振業. "Switched Reluctance Motor Efficiency and Torque Ripple Control". Thesis, 2002. http://ndltd.ncl.edu.tw/handle/30687293921127645591.
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碩士淡江大學
機械工程學系
90
Although switched reluctance motors have the advantages of low manufacturing cost, suitable for high speed, and poor working environments, the doubly salient structure introduces torque ripple during phase commutation and ultimately cause noise and vibration in speed responses. The objective of this thesis is to develop a phase commutation scheme that will maximize motor operation efficiency while minimizing torque ripple at the same time. The mathematical model, the principle of operation, and several common driving schemes for switched reluctance motors are presented first. Then, the influences of current profile to motor efficiency and generated torque are investigated. Based on the analytic results, a phase commutation scheme is proposed for maximum efficiency and minimum torque ripple operations of switched reluctance motors. The proposed control scheme was verified with simulations and experiments. All the results have shown that the control scheme can effectively reduce motor torque ripple.
41
Huang, Jian-Yuan y 黃建源. "Efficiency Improvement of Five-phase Switched Reluctance Motor Drives". Thesis, 2015. http://ndltd.ncl.edu.tw/handle/g8cz56.
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碩士國立臺灣科技大學
電機工程系
104
The thesis is concerned with the efficiency improvement of five-phase switched reluctance motor drives. The proposed control strategy uses the Hall-effect sensors to detect the excitation range of each phase. Adopting two-phase excitation and current hysteresis control strategy to closely follow the current command, motor efficiency can be increased. The test system is equiped with digital control unit using 32-bit microprocessor and logic circuit, while the rotation speed and current control firmware are compiled with C language. The experimental results of the closed-loop speed control system of five-phase reluctance motor with two-phase excitation and current hysteresis control show that under rated speed of 1,500 rpm and rated torque of 1 N-m, the overall efficiency can reach 73%, as compared to 52% using the singal-phase excitation only. In addition, braking operation from rated speed to standstill yields an energy battery regeneration of 25 J over the output energy of 27.41 J from five-phase power converter, resulting in an energy saving of 91%. The experimental results validate the feasibility of the proposed control strategy.
42
Huang, Wen-Nan y 黃文楠. "An Efficiency Improvement Strategy for Switched Reluctance Motor Drives". Thesis, 2006. http://ndltd.ncl.edu.tw/handle/26181982776316433623.
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博士國立交通大學
電機與控制工程系所
94
A new control concept, the strategy of efficiency improvement for switched reluctance motor (SRM) drives applying derivation results based on analysis model, is proposed in this dissertation. The presented efficiency consideration and its control approach are inspired and originated from an SRM model, whereas can be realized by regulation of the ratio of the phase current command to voltage within derivatives of equivalent magnetic inductance with respect to time. Moreover, the efficiency improvement strategy is further discussed for constructing the applicable driving scheme in practical usage, operating based on the assigned regulation rule for searching the upgraded efficiency that may exist for the SRM drives by step-type variation of current command. The linking relation of parameters of SRM’s model is utilized to execute commands under operation of SRM drives while no exceeding to the setting ranges according to the outputted performance requirement. For the overall control scheme of the efficiency improving mechanism, a fuzzy neural network (FNN) system is applied to approximately compute the partial derivative of the equivalent magnetic inductance profile for the SRM with respect to the rotor position and current, while the inductance is obtained firstly by the mapping scheme of the FNN for relations among the position, current, and the inductance as well. In addition, several new estimation schemes and measurement approaches for getting the needed parameters, including the parameters of resistance, inductance, mutual inductance, torque, and speed, are also presented for considerations of the integration and combination to the efficiency improving schemes for extending its feasibility. Furthermore, an artificial neural network (ANN) is presented to establish the core unit with outputted performance judgment capability for under-saturation operation, as well as one of the dual-core operation with the FNN’s scheme for high-portion saturation working. Besides, two performance enhancement schemes that can deal with the variation of the resistance or take the mutual inductance into account by current compensation are discussed for the high-performance SRM dives. The research platforms for verification related to these issues are implemented applying two SRMs for possible applications of electrical bikes and washing machines, respectively. Simulation and experimental results partly demonstrated the validity of the capability of the proposed strategy with efficiency improvement up to 3.5 %, 5 %, and 7.1 % for one application target, and 3 %, 2.2 %, and 5.1 % to the other practice, both under the testing of ratio of 0.2, 0.5, and 1, rated power of the applied SRM drives.
43
Cunningham, John David. "Switched reluctance motor drive circuit evaluation criteria for vehicle efficiency responsiveness". 2011. http://hdl.handle.net/2152/20640.
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This thesis intends to examine the principles of operation for switched reluctance machines (SRM) and examine the power electronic drive circuits that control them, in order provide a basis of understanding for evaluating total drive efficiency and responsiveness potential. This document specifically examines the characteristics of a motor drive circuit which affect motor and converter efficiency and driving performance. A drive topology suited for efficient operation and excellent responsiveness is proposed. Finally, a SRM drive system model for evaluating these systems in simulation is described as a tool for comparative evaluations in future work. The end goal of this work is to provide a foundation of knowledge for future work, developing in-wheel, SRM-based, high performance hybrid electric drivetrains in future ground combat vehicles which are modular, possess an open architecture for upgrades, and operate with high efficiency and improved mobility.text
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Lin, Shih-Tang y 林仕堂. "Development for Switched Reluctance Motor drivers". Thesis, 2008. http://ndltd.ncl.edu.tw/handle/32777127739305525829.
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碩士義守大學
電子工程學系碩士班
96
In order to pursue the economical development, people unlimitedly squeeze the earth resource at will for a long time. Today, the energy shortage problem and the change of the climate environment have greatly influenced people’s life, people realize it has already been very urgent work that economize on energy and reduce the production of the carbon. The switched reluctance motor has the advantages of the simple structure, low cost, high start-torque, high efficiency. And the engineers can control both the current and voltage of the motor’s coil, and the angle of the operation in order to let the SR motor be more powerful. So the SRM may become a suitable candidate to substitute traditional ac motor and play a main role on energy-saving. In this thesis, the SRM driver system based on the low-cost microcontroller will be provided. The driver system is designed to use the Chopped Current Control, (CCC) algorithm and PI algorithm in the low rotational speed district. The proposed algorithms can greatly improve the speed controllability and stability, and restrain the value of the current. In the high rotational speed district, Angular Position Control, (APC) algorithm is used to improve the torque efficiency.
45
Chiu, Ming-Liang y 邱明亮. "Soft-Switching of Switched Reluctance Motor". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/06661608939656257393.
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碩士明志科技大學
電機工程研究所
98
In this thesis, soft-switching resonant converter was used. It allows a switched reluctance motor to be able to perform the soft-switching under the zero-voltage state. The circuit is composed of an auxiliary switch, resonant inductor and resonant capacitor. By using this resonant circuit, the switch can accomplish the switching action to achieve nearly zero switching loss at the very low voltage state. Moreover, the problems such as motor noise, heat loss and EMI can be improved. The switching frequency is allowed to be increased in order to improve the system performance. This article explains the details of the soft-switching circuit and the principle of the voltage current formula under the different operating mode. Moreover, the parameters for the resonant components are designed. When each phase current is tracked, the digital modulation is carried out to regulate the current’s error, the resultant signal is changed so that the DC-link voltage is forced to decrease down to zero and the zero-switching loss can be implemented.
46
Wang, Chun-Zhen y 王淳正. "Design of Switched-Reluctance Motor Drives". Thesis, 2012. http://ndltd.ncl.edu.tw/handle/85403648869142884588.
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碩士國立臺灣科技大學
電機工程系
100
Abstract This thesis is concerned with the development of a switched reluctance motor drive system. This system is divided into two parts, namely a switched reluctance motor and its drive. The four-phase motor adopts an 8-pole stator and a 6-pole rotor. In addition to the geometrical structure of the stator and rotor, the numbers of the windings of the stator are designed based on the electromagnetic torque equation, the inductance equation and the anti-electric equation and validated according to the magnetic circuit simulation with finite element analysis software(Ansoft Maxwell 2D). The results obtained are used to build the motor. The switched reluctance motor driver uses two Hall sensors and a 12-pole ring magnet to detect the rotor position, generating signals to determine if phase separation and excitation should occur. The control of two sets of power converters is then conducted. In this thesis, the closed-loop control strategy of rotational speed utilizes a feed-forward compensation technique and a rotational speed regulator to boost the response of the rotational speed and efficiency. This system adopts a 16-bit digital signal processing device(sPIC30F4011) as the control core. All the control is done with software, so that the hardware cost can be reduced. Besides, the reliability of the system can be enhanced as well. The proposed system is capable of operating at a speed of 3000 rpm and providing torque up to 0.88N-m with 200-watt load and the efficiency is over 70%. Key word：switched reluctance motor、two sets of power converters、closed-loop control strategy of rotational speed.
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Liu, Wei-Ting y 劉威廷. "Switched Reluctance Motor Self-Bearing Control". Thesis, 2005. http://ndltd.ncl.edu.tw/handle/67292301845909058828.
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碩士淡江大學
機械與機電工程學系碩士班
93
Switched reluctance motors develop torque through an attraction force between the stator poles and the rotor teeth. This attraction force can be divided into tangential and radial force components. The tangential force converts to the rotational torque, and the net radial force is generally zero due to the geometrically balanced motor structure. Due to its special structure, the shaft radial force and torque of a three-phase 12/8 switched reluctance motor can be separately controlled by proper selection of pole currents. Therefore, when all the pole currents can be controlled independently, it is possible to control the radial force to counterbalance the external force acting on the shaft. Consequently, the rotor can be controlled to a position near the center of the air gap when it does not have a rotational bearing. In this paper, a control scheme for self-bearing of a 12/8 pole SRM drive is proposed. The rotor needs only one bearing for rotation and to constrain the axial movement. The other end can move freely in radial direction but is balanced with the radial force produced by the motor. Motor torque and radial force characteristics is analyzed and modeled, the self-bearing control scheme is developed and presented. The proposed control scheme is also implemented with a DSP and verified experimentally.
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Hwu, Kuo-Ing y 胡國英. "Development of a switched reluctance motor". Thesis, 2001. http://ndltd.ncl.edu.tw/handle/66306492533791392908.
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博士國立清華大學
電機工程學系
89
The major purpose of this dissertation lies in the development of some advanced circuits and control techniques to promote the ability of the switched reluctance motor (SRM) in high-performance applications. After surveying the existing converter circuits, an experimental SRM drive is established. In developing a model for the SRM, its nonlinear winding inductance is estimated by curve fitting according to measurements. Following that, a simulation environment for the overall SRM drive is built up using POWERSYS and SIMULINK. In order to improve the performance of the SRM at high speeds, an active voltage boosting circuit is developed to reduce the effects of the back electromotive force (EMF) and the winding inductance on the current response. The circuit operation and the switching control of the proposed voltage boosting circuit are described in detail. The simulation and experimental results show that the winding current tracking response and hence the torque generating capability are significantly enhanced through applying the developed voltage boosting circuit. Since the winding current tracking trajectory and the inductance profile of an SRM are far from the predicted shapes, its torque generating characteristics are difficult to specify and optimize quantitatively. To improve this, according to the observations about the effect of the commutation instant on the torque generating characteristics, an intelligent tuning approach is proposed. The minimization of the motor-drawn current is employed as a performance index to equivalently yield the maximum torque per ampere (TPA). Through utilizing the proposed tuning mechanism, the motor conversion efficiency and the speed dynamic response can be considerably improved. As to the speed control of the SRM drive, the quantitative and robust two-degree-of-freedom (2DOF) control approaches have not been addressed. In this dissertation, the estimation of a dynamic model and the quantitative design of a robust 2DOF speed controller using the inverse model concept are presented. According to the estimated dynamic model and the prescribed load regulation speed control specifications, the feedback controller is first designed. Then, a command feedforward controller is designed to let the speed tracking response follow the response defined by a reference model. As variations in system parameters or operating conditions occur, a robust controller (RC) is added to preserve the model following speed tracking response as far as possible, and at the same time the speed variation due to the load torque change prescribed in the design stage can be reduced further. In designing the proposed RC, the effect of system transport delay on the closed-loop stability is also taken into account. Finally, a 2DOF controller using a fuzzy adapted inverse model is developed. As generally recognized, to attain a perfect speed tracking response, the command feeedforward controller should be exactly equal to the inverse of the actual motor drive model all the time. To achieve this goal, the inverse model employed in the command feedforward controller is adaptively tuned using a fuzzy control technique. Since the command feedforward control scheme is irrelevant to the speed load regulation response, a disturbance cancellation robust controller considering system transport delay is added to reduce speed variations due to load torque disturbances, and meanwhile the speed tracking response can be improved still further.
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Peres, Pedro Miguel Courelas. "Switched Reluctance Motor Fault Tolerant Operation". Master's thesis, 2019. http://hdl.handle.net/10362/96709.
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In recent years, with the development of micro and power electronics, the switched reluctance
machine has been gaining popularity. This type of machine is attractive because
it has a cheap and easy construction, having absence of rotor windings and permanent
magnets. It has also an inherent fault tolerance ability.
Due to this fault tolerance it has gained the attention of industries and applications
that require safe and reliable operation. However, the machine is only fault tolerant to
a point and, with the aim of improving its already high fault tolerance, multiple studies
were conducted on the subject.
In this dissertation a new passive fault tolerant method, comprising on simple modifications
in the windings, converter and control method will be presented. Worth notice
that one of the modifications is already discussed in the cited literature. This method is
aimed principally at open circuit faults in the windings with the machine working as a
motor in the low speed zone.
The effectiveness of this method will be studied by comparison of a regular SRM
with one with the solution through simulation of winding fault conditions, namely open
and short circuits faults. In order to do this, first finite element analysis was performed,
with the software Flux2D®, in order to obtain the magnetic and torque characteristics of
the machines. This was followed by dynamic simulations in Matlab-simulink®. It will be
shown that the method is very effective for open circuit faults but will only have negligible
improvements in case of winding short circuits.
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Aljaism, Wadah A., University of Western Sydney, College of Health and Science y School of Engineering. "Switched reluctance motor : design, simulation and control". 2007. http://handle.uws.edu.au:8081/1959.7/26494.
Texto completoResumen
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.Doctor of Philosophy (PhD)