Analysis of Highly Reliable Electric Drive System Based on Dual-Winding Fault-Tolerant Permanent Magnet Motor

Dual-winding fault-tolerant permanent magnet motor (DFPMM) possesses advantages of high efficiency, high power density, and compact structure, in addition to the features of physical, electrical, magnetic, and thermal isolation. In this paper, a novel highly reliable electric drive system based on DFPMM is designed and proposed, which requires only one power supply, fewer power converters, and a high utilization rate than the existing ones. The novel highly reliable electric drive system is capable of implementing fault-tolerant actions when the multi-phase winding open-circuit or short-circuit faults, bridge arm short-circuits, and multiple power switches faults occur simultaneously, and the torque can be output normally under fault conditions. The one-phase winding open-circuit fault is one of the most common types of fault. When a one-phase open-circuit fault occurs, the performance of the system will become abnormal if no fault-tolerant control strategy is adopted. The fault-tolerant control strategy of the novel highly reliable electric drive system is proposed and researched in this paper. The simulated and experimental results show the reliability and fault-tolerant ability of the proposed DFPMM drive system under the open-circuit fault. By adopting the proposed fault-tolerant control strategy, the DFPMM drive system can realize normal operation after a winding open-circuit occurs.