Robust Detection for Demagnetization Fault in the Permanent-Magnet Synchronous Motor Using Improved Sliding-Mode Observer

Author:

Zhang Miaoying1,Cheng Xiang2,Xiao Fan3,Zhang Faming3

Affiliation:

1. College of Rail Transit Locomotive and Vehicle, Hunan Railway Professional Technology College, No.18 Tian Xin Road, Shifeng District, Zhuzhou, Hunan 412001, China

2. Hunan Railway Professional Technology College, No.18 Tian Xin Road, Shifeng District, Zhuzhou, Hunan 412001, China

3. Hunan University of Technology, No.188 Taishan Xi Road, Tianyuan District, Zhuzhou, Hunan 412007, China

Abstract

This paper investigates a robust detection for demagnetization fault in the permanent-magnet synchronous motor (PMSM). A proportional-integral fading sliding-mode observer (PIFSMO) is proposed, which can solve the problem of PMSM performance degradation caused by the permanent-magnet demagnetization and resistance disturbance increase during long-term operation. A PMSM demagnetization model is established, and an improved PIFSMO is proposed to detect the demagnetization flux linkage. A fading integral term is added to the traditional sliding-mode observer, which can suppress the offset in the resistance disturbance estimation caused by transients, thereby achieving direct estimation of the resistance disturbance and the slowly varying resistance disturbance (e.g., ḋ≠0) in particular. Simulation and experimental results demonstrate the feasibility and effectiveness of the proposal.

Funder

Natural Science Foundation of Hunan Province

Publisher

Fuji Technology Press Ltd.

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