Natural Fault-Tolerant Control With Minimum Copper Loss in Full Torque Operation Range for Dual Three-Phase PMSM Under Open-Circuit Fault

Traditional perspective considers that there is a tradeoff between the postfault operational performance and the implementation complexity of the control scheme. To approach this problem, this article proposes a natural full range minimum-loss strategy by analyzing the current relation between torque subspace and harmonic subspace. The harmonic subspace current references satisfying full range minimum-loss are generated by a simple expression according to the real-time subspace current vector features. Compared with existing fault-tolerant control methods, the proposed strategy does not need complicate fault diagnosis, as well as offline or online optimization process. The experimental results demonstrate that the proposed fault-tolerant control strategy can achieve smooth prefault to postfault transition and FRML simultaneously.