volume | PIER Journals

Abstract

To address issues such as reduced motor output performance and diminished load capacity caused by permanent magnet demagnetization in Permanent Magnet Synchronous Motor (PMSM), a super-twisting algorithm-based fault-tolerant predictive control strategy for demagnetization faults in PMSM is proposed. First, the improved super-twisting non-singular fast terminal sliding mode observer (IST-NFTSMO) is constructed to accurately observe the flux linkage and predict the current at the next moment. Based on the observed values, a deadbeat fault-tolerant predictive control (DFTPC) algorithm is built to compensate for the torque loss due to permanent magnet demagnetization, thereby achieving fault-tolerant control of the system. Second, a sliding mode controller based on a novel reaching law is designed, thereby overcoming the shortcomings of traditional control strategies in PMSM vector control systems, such as poor anti-interference capability and slow response speed. Finally, experimental results demonstrate that after a demagnetization fault occurs in the PMSM, the proposed method effectively improves the fault tolerance capability of the PMSM system while ensuring the dynamic response speed of the control system, thereby endowing the system with enhanced stability and robustness.

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Dr. Yang Zhang

Dr. Wancheng Xie

Dr. Yang Gao

Dr. Jiahao Zhang

Dr. Moutao Li