Design and Optimization of a High-Speed Permanent Magnet Synchronous Motor with Stator Auxiliary Slots Based on Multi-Physics Field Coupling

High-speed permanent magnet synchronous motors (HSPMSM) have excellent dynamic performance. But the harmonics in its high-frequency alternating magnetic field also cause additional losses, making its losses much higher than those of a normal-speed motor. Adding auxiliary slots can attenuate the harmonics, but how to optimize the auxiliary slots according to their size and shape has not been studied. To better explore the influence of the auxiliary slot and improve the efficiency of optimizing the HSPMSM, this paper optimizes the topology of a 15 kW, 120,000 rpm HSPMSM. The optimized HSPMSM is calibrated based on multi-physics field simulation, and the results show that the optimized scheme can significantly suppress harmonics and effectively reduce the loss density of the HSPMSM without affecting the output performance of the HSPMSM.