A fault tolerant sensorless position estimation scheme for switched reluctance motor at low speed
ISSN: 0332-1649
Article publication date: 11 May 2020
Issue publication date: 20 August 2020
Abstract
Purpose
This paper aims to present a novel position sensorless control scheme with fault-tolerance ability for switched reluctance motor at low speed.
Design/methodology/approach
First, the detection pulses are injected in the freewheeling and idle intervals of each phase. Second, the aligned position of each phase can be detected by comparing the consecutive rise time of detection current. Third, the whole-region rotor position and real-time rotational speed can be updated four times for the improvement of detection accuracy. Finally, the fault-tolerant control strategy is performed to enhance the robustness and reliability of proposed sensorless scheme under faulty conditions.
Findings
Based on proposed sensorless control strategy, the estimated rotor position is in good agreement with the actual rotor position and the maximum rotor position error is 1.5°. Meanwhile, the proposed sensorless scheme is still effective when the motor with multiphase loss and the maximum rotor position error is 1.9°. Moreover, the accuracy of the rotor position estimation can be ensured even if the motor is in an accelerated state or decelerated state.
Originality/value
The proposed sensorless method does not require extensive memory, complicated computation and prior knowledge of the electromagnetic properties of the motor, which is easy to implement. Furthermore, it is suitable for different control strategies at low speed without negative torque generation.
Keywords
Acknowledgements
This work is supported by the National Natural Science Foundation of China-NSFC-ASRT (Chinese-Egyptian) Cooperative Research project under Grant 51961145401
Citation
Dong, F., Chen, H., Xu, S. and Cui, S. (2020), "A fault tolerant sensorless position estimation scheme for switched reluctance motor at low speed", COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, Vol. 39 No. 4, pp. 823-837. https://doi.org/10.1108/COMPEL-08-2019-0307
Publisher
:Emerald Publishing Limited
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