Design and Multi-Physics Coupling Analysis of 100 kr/min High-Speed Permanent Magnet Synchronous Motor Considering Inverter Harmonics

High-speed permanent magnet machines (HSPMMs) have attracted more attention from motor researchers due to their excellent performance. However, the design of HSPMMs is a complex multi-physical coupling problem, involving electromagnetic field, thermal field, and mechanical stress. In order to establish an accurate model to analyze the HSPMM, based on the three-dimensional finite element model (FEM), this paper designs and analyzes a 100 kr/min HSPMM by considering the influence of current harmonics at different switching frequencies. According to the results of multi-physics coupling calculation, a prototype is manufactured and the effectiveness of the design is verified by experiments. The multi-physics coupling analysis method considering inverter current harmonics proposed in this paper can more accurately model HSPMMs, which has certain reference significance for the design and development of HSPMMs.