eliminating the position sensor in a switched reluctance motor drive actuator application PDF
Preview eliminating the position sensor in a switched reluctance motor drive actuator application
UUnniivveerrssiittyy ooff KKeennttuucckkyy UUKKnnoowwlleeddggee University of Kentucky Doctoral Dissertations Graduate School 2005 EELLIIMMIINNAATTIINNGG TTHHEE PPOOSSIITTIIOONN SSEENNSSOORR IINN AA SSWWIITTCCHHEEDD RREELLUUCCTTAANNCCEE MMOOTTOORR DDRRIIVVEE AACCTTUUAATTOORR AAPPPPLLIICCAATTIIOONN Jinhui Zhang University of Kentucky RRiigghhtt cclliicckk ttoo ooppeenn aa ffeeeeddbbaacckk ffoorrmm iinn aa nneeww ttaabb ttoo lleett uuss kknnooww hhooww tthhiiss ddooccuummeenntt bbeenneefifittss yyoouu.. RReeccoommmmeennddeedd CCiittaattiioonn Zhang, Jinhui, "ELIMINATING THE POSITION SENSOR IN A SWITCHED RELUCTANCE MOTOR DRIVE ACTUATOR APPLICATION" (2005). University of Kentucky Doctoral Dissertations. 343. https://uknowledge.uky.edu/gradschool_diss/343 This Dissertation is brought to you for free and open access by the Graduate School at UKnowledge. It has been accepted for inclusion in University of Kentucky Doctoral Dissertations by an authorized administrator of UKnowledge. For more information, please contact [email protected]. ABSTRACT OF DISSERTATION Jinhui Zhang The Graduate School University of Kentucky 2005 ELIMINATING THE POSITION SENSOR IN A SWITCHED RELUCTANCE MOTOR DRIVE ACTUATOR APPLICATION ABSTRACT OF DISSERTATION A dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the College of Engineering at the University of Kentucky By Jinhui Zhang Lexington, Kentucky Director: Dr. Arthur V. Radun, Professor of Electrical engineering Lexington, Kentucky 2005 Copyright © Jinhui Zhang 2005 ABSTRACT OF DISSERTATION ELIMINATING THE POSITION SENSOR IN A SWITCHED RELUCTANCE MOTOR DRIVE ACTUATOR APPLICATION The switched reluctance motor (SRM) is receiving attention because of its merits: high operating temperature capability, fault tolerance, inherent shoot-through preventing inverter topology, high power density, high speed operation, and small rotor inertia. Rotor position information plays a critical role in the control of the SRM. Conventionally, separate position sensors, are used to obtain this information. Position sensors add complexity and cost to the control system and reduce its reliability and flexibility. In order to overcome the drawbacks of position sensors, this dissertation proposed and investigated a position sensorless control system that meets the needs of an electric actuator application. It is capable of working from zero to high speeds. In the control system, two different control strategies are proposed, one for low speeds and one for high speeds. Each strategy utilizes a state observer to estimate rotor position and speed and is capable of 4 quadrant operation. In the low speed strategy a Luenberger observer, which has been named the inductance profile demodulator based observer, is used where a pulse voltage is applied to the SRM’s idle phases generating triangle shaped phase currents. The amplitude of the phase current is modulated by the SRM’s inductance. The current is demodulated and combined with the output of a state observer to produce an error input to the observer so that the observer will track the actual SRM rotor position. The strategy can determine the SRM’s rotor position at standstill and low speeds with torques up to rated torque. Another observer, named the simplified flux model based observer, is used for medium and high speeds. In this case, the flux is computed using the measured current and a simplified flux model. The difference between the computed flux and the measured flux generates an error that is input to the observer so that it will track the actual SRM rotor position. Since the speed ranges of the two control stragegies overlap, the final control system is capable of working from zero to high speed by switching between the two observers according to the estimated speed. The stability and performance of the observers are verified with simulation and experiments. KEYWORDS: Switched Reluctance Motor, Sensorless Control, Flux model, Real Time Control, Actuator Application ELIMINATING THE POSITION SENSOR IN A SWITCHED RELUCTANCE MOTOR DRIVE ACTUATOR APPLICATION By Jinhui Zhang Director of Dissertation Director of Graduate Studies RULES FOR THE USE OF DISSERTATION Unpublished dissertations submitted for the Doctor’s degree and deposited in the University of Kentucky are as a rule open for inspection, but are to be used only with due regard to the rights of the authors. Bibliographical references may be noted, but quotations of summaries of parts may be published only with the permission of the author, and the usual scholarly acknowledgements. Extensive copying or publication of the thesis in whole or in part requires also the consent of the Dean of the Graduate School of the University of Kentucky. A library that borrows this dissertation for use by its patrons is expected to secure the signature of each user. Name Date DISSERTATION Jinhui Zhang The Graduate School University of Kentucky 2005 ELIMINATING THE POSITION SENSOR IN A SWITCHED RELUCTANCE MOTOR DRIVE ACTUATOR APPLICATION DISSERTATION A dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the College of Engineering at the University of Kentucky By Jinhui Zhang Lexington, Kentucky Director: Dr. Arthur V. Radun, Professor of Electrical engineering Lexington, Kentucky 2005 Copyright © Jinhui Zhang 2005 To my parents; Zhang, Senyou and Wang, Meifang, my wife, Li, Haoju, my sons, Leonald and Larry, my sisters, Xijing and Jin’ge.
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