Multiple Operation Design and Optimization of a Five-Phase Interior Permanent Magnet Motor Considering Compound Fault Tolerance From Perspective of Flux-Intensifying Effect
Li Zhang, Sisi Deng, Xiaoyong Zhu, Dong Shen, Chao Chen, Xuqing Li
Abstract
Strong fault tolerance is of great significance for motor systems. To satisfy the demands of multiple operations, this paper proposes a new flux-intensifying fault-tolerant interior permanent magnet (FIFT-IPM) motor that enables strong fault tolerance, good sensorless capacity, and good torque performance. Due to the strict constraints with winding structures and slot-pole combinations of the traditional fault-tolerant motors, their compound fault tolerance of stator winding and position sensors by the flux-intensifying design is difficult to implement. Hence, in this study, a design concept of “multiple magnetic-barrier guidance” is innovatively put forward and a novel motor is designed and optimized considering compound fault tolerance. First, the new slot-pole combination (20-slot/12-pole) is proposed from the perspective of flux intensifying effect. Second, through the three design steps of rotor poles, PM, and <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">q</i> -axis magnetic barriers, the obvious and stable inverse saliency characteristic is obtained. Then, through multi-objective optimization, both torque performances and compound fault tolerance performances can be better tradeoffs. Finally, the simulation analysis and experimental tests verify the validity of the proposed method.