A Fault-Tolerant MTPA Control Strategy of Five-Phase Flux-Intensifying Fault-Tolerant Permanent-Magnet Motor With Sliding-Mode Disturbance Observer Under Open-Circuit and Short-Circuit Faults

A fault-tolerant MTPA control strategy of five-phase flux-intensifying fault-tolerant permanent magnet synchronous motor (FI-FTPMSM) under open-circuit and short-circuit faults is presented. In previous studies, existing fault-tolerant MTPA control strategies suffer from weak robustness to the parameter variation, which is not suitable for the utilization of reluctance torque of the FI-FTPMSM. In this article, a five-phase FTPMSM with flux-intensifying effect is designed and proposed. To fully utilize the reluctance torque with flux-intensifying effect under fault conditions, an extended VSI-MTPA control strategy with a compensation factor is proposed, which can improve the dynamic and steady-state performance of the motor drive system under fault conditions. In addition, an extended sliding-mode disturbance observer with adaptive gain is proposed to suppress the harmonic interference caused by faults, which possesses good resistance to complex disturbance. Finally, the feasibility and effectiveness of the proposed strategy are verified by experimental results.