高速表贴式永磁转子强度等效计算与分析

永磁体在高速运转的情况下需要通过外装护套，减少永磁体承担离心力引起的拉应力，防止永磁体损坏。针对表贴式高速永磁电机双层护套转子强度问题，根据弹性力学，推导出受温度影响的高速永磁转子强度解析公式，并且用有限元方法验证分析，结果表明两种方法结果一致，解析法能准确计算三种运行工况下非导磁金属护套、碳纤维护套、永磁体、转子铁心的应力和形变位移量。并且进一步分别研究了两种护套厚度、永磁体厚度 、铁心内径的变化对强度的影响，总结了表贴式高速永磁电机双层护套转子强度变化规律。

Equivalent strength calculation and analysis of high speed surface mounted permanent magnet rotor

In the case of high-speed operation, the permanent magnet needs to be equipped with an outer sheath to help the permanent magnet bear the tensile stress caused by centrifugal force and prevent the permanent magnet from being damaged. Aiming at the strength problem of the double-sheathed rotor of the surface-mounted high-speed permanent magnet motor, according to elastic mechanics, the analytical expression of the strength of the high-speed permanent magnet rotor affected by temperature is derived, and the finite element method is used to compare and analyze the results. , The analytical method can accurately calculate the stress and deformation displacement expressions of the non-magnetic metal sheath, carbon fiber sheath, permanent magnet, and rotor core under three operating conditions. On this basis, the influence of two kinds of sheath thickness, permanent magnet thickness and iron core inner diameter on the strength are studied separately, and the strength change law of the double-sheathed rotor of a surface-mount high-speed permanent magnet motor is summarized.