Multiple Operation Design and Optimization of a Five-Phase Interior Permanent Magnet Motor Considering Compound Fault Tolerance From Perspective of Flux-Intensifying Effect

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 q -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.