Abstract

AbstractIn this work, a reliable fault‐tolerant control scheme is proposed for open‐circuit faults of the drive in a three‐phase permanent magnet synchronous motor (PMSM) control system. A three‐phase four‐switch fault‐tolerant topology drive is employed to guarantee the continuous operation after fault occurrence. A non‐singular terminal sliding mode control (NTSMC) scheme is proposed to improve the robustness and the dynamic performance of the post‐fault system. To estimate the information of fault, a nonlinear learning fault observer is constructed. Based on the fault information, a compensation term is added to the control scheme against the adverse effects of the transition process. Simulation results show that the proposed fault‐tolerant control scheme enables the system to track the desired reference commands in the absence/presence of faults with satisfactory performance and achieves smooth transition for control law switching.

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