Analysis and Optimization of a Dual PM FRM with Auxiliary Teeth

The flux reversal machine (FRM) belongs to the permanent magnet (PM) brushless machine with a simple structure and high efficiency, which is suitable for the field of new energy vehicles. However, due to the structural characteristics of FRM, the flux leakage and torque ripple are large, which limits the improvement of torque performance. In addition, for the application of FRM, improving fault tolerance is also one of the important contents. Therefore, a dual PM FRM (DPM-FRM) with auxiliary teeth is proposed, in which the PM array and auxiliary teeth are installed in the slot. The DPM-FRM not only has higher torque performance but also improves fault tolerance. To obtain better machine performance, a multi-objective genetic algorithm (MOGA) is used to optimize the DPM-FRM and conventional FRM. Finally, the two optimized machines are analyzed and compared by finite element method. Compared with the FRM, the average torque of the DPM-FRM is increased by 64.98% and the torque ripple is reduced by 14.16%. In addition, the fault tolerance is also improved.