Online sensorless position estimation for switched reluctance motors using one current sensor

Gan, Chun, Wu, Jianhua, Hu, Yihua, Yang, Shiyou, Cao, Wenping and Kirtley, James L. (2016). Online sensorless position estimation for switched reluctance motors using one current sensor. IEEE Transactions on Power Electronics, 31 (10), pp. 7248-7263.

Abstract

This paper proposes an online sensorless rotor position estimation technique for switched reluctance motors (SRMs) using just one current sensor. It is achieved by first decoupling the excitation current from the bus current. Two phase-shifted pulse width modulation signals are injected into the relevant lower transistors in the asymmetrical half-bridge converter for short intervals during each current fundamental cycle. Analog-to-digital converters are triggered in the pause middles of the dual pulse to separate the bus current for excitation current recognition. Next, the rotor position is estimated from the excitation current, by a current-rise-time method in the current-chopping-control mode in a low-speed operation and a current-gradient method in the voltage-pulse-control mode in a high-speed operation. The proposed scheme requires only a bus current sensor and a minor change to the converter circuit, without a need for individual phase current sensors or additional detection devices, achieving a more compact and cost-effective drive. The performance of the sensorless SRM drive is fully investigated. The simulation and experiments on a 750-W three-phase 12/8-pole SRM are carried out to verify the effectiveness of the proposed scheme.

Publication DOI: https://doi.org/10.1109/TPEL.2015.2505706
Divisions: Engineering & Applied Sciences
Additional Information: © 2016 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Uncontrolled Keywords: bus-current-sensor,position estimation,pulse width modulation,sensorless control,switched reluctance motors
Full Text Link: http://ieeexplo ... rnumber=7347444
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Published Date: 2016-10
Authors: Gan, Chun
Wu, Jianhua
Hu, Yihua
Yang, Shiyou
Cao, Wenping ( 0000-0002-8133-3020)
Kirtley, James L.

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Version: Accepted Version


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