Research on Mechanical Characteristics of High-Speed Permanent Magnet Motor

Compared with the constant speed permanent magnet (PM) motor, the rotor strength and rotor dynamic characteristics of the high-speed PM motor(HSPMM) are particularly important. In this paper, a 100kW, 40000 rpm HSPMM rotors are used as an example, and the finite element method(FEM) is used to analyze the influence of different factors on the rotor strength and rotor dynamic of HSPMM. The analysis results show that the appropriate increase of the assembly interference and the use of a larger thickness of the protective sleeve can effectively reduce the effect of the centrifugal force on the permanent magnet, and increasing the support stiffness can effectively increase the critical speed, but its impact will no longer be obvious when the support stiffness exceeds 1 × 107N/mm. The results of this study will provide a reliable reference for the analysis of the mechanical characteristics of HSPMM.