关键词: 表贴式高速永磁电机, 有限元仿真, 转子强度分析, 多维可视化, 碳纤维护套

Abstract: The sleeve thickness and interference are the main factors affecting the rotor strength of surface-mounted high-speed permanent magnet motor( SHPMM) . By analyzing the force situation of the permanent magnet rotor, the strength model of a three-dimensional permanent magnetic motors ' rotor was simplified into a plane stress problem, and a stress analytical solution for the carbon-fiber sleeve permanent magnet motors' rotor, which took into account the effects of the sleeve thickness, the interference and rotational speed was deduced in a polar coordinate. On the basis of the above conditions, the pressure between the contact surfaces of the permanent magnet and the rotor core, the maximum hoop stress of the carbon fiber sleeve were taken as the optimization objectives, the stress limit strength of the permanent magnet and the sleeve were taken as the constraints, and the thickness of the carbon fiber sleeve and the static interference between the permanent magnet and the carbon fiber sleeve were chosen as the design variables. Then the optimal solution range of the sleeve thickness and static interference that meets the conditions was found by the multi-dimensional visualization algorithm. The stress distribution of the rotor was verified by comparing the computational results of the finite element method and the analytical method. Simulation results show that the rotor sleeve designed can meet the strength protection requirements of permanent magnets at high speeds, and can realize the optimal design of carbon fiber sleeve installed on the rotor surface of SHPMM.

Key words: surface-mounted high-speed permanent magnet motor( SHPMM), finite element simulation, rotor strength analysis, multi-dimensional visualization, carbon fiber sleeve