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A new sensorless method for switched reluctance motor drives

Gallegos-Lopez, G., Kjaer, P.C., and Miller, T.J.E. (1998) A new sensorless method for switched reluctance motor drives. IEEE Transactions on Industry Applications, 34 (4). pp. 832-840. ISSN 0093-9994 (doi:10.1109/28.703987)

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Publisher's URL: http://dx.doi.org/10.1109/28.703987

Abstract

This paper describes a new method for indirect sensing of the rotor position in switched reluctance motors (SRMs) using pulse width modulation voltage control. The detection method uses the change of the derivative of the phase current to detect the position where a rotor pole and stator pole start to overlap, giving one position update per energy conversion. As no a priori knowledge of motor parameters is required (except for the numbers of stator and rotor poles), the method is applicable to most SRM topologies in a wide power and speed range and for several inverter topologies. The method allows modest closed-loop dynamic performance. To start up the motor, a feedforward stepping method is used which assures robust startup (even under load) from standstill to a predefined speed at which closed-loop sensorless operation can be applied. Experimental results demonstrate the robust functionality of the method with just one current sensor in the inverter, even with excitation overlap, and the sensorless operation improves with speed. The method is comparable to the back-EMF position estimation for brushless DC motors in principle, performance and cost. A detailed operation and implementation of this scheme is shown, together with steady-state and dynamic transient test results.

Item Type:Article
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Miller, Prof Timothy
Authors: Gallegos-Lopez, G., Kjaer, P.C., and Miller, T.J.E.
Subjects:T Technology > TK Electrical engineering. Electronics Nuclear engineering
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:IEEE Transactions on Industry Applications
Publisher:Institute of Electrical and Electronics Engineers (IEEE)
ISSN:0093-9994
Copyright Holders:Copyright © 1998 Institute of Electrical and Electronics Engineers (IEEE)
First Published:First published in IEEE Transactions on industry applications 34(4):832-840
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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