基于有限元法的高速永磁转子强度分析

摘要

In order to solve the problem which the permanent magnets can be damaged for the tremendous centrifugal stress when the high-speed permanent magnet rotor rotates in laige circumferential linear velocity, the mechanical strength of high-speed permanent magnet rotor was researched. Stability operation mechanical conditions of the surface-mounted permanent magnet rotor were analyzed. The mathematical model between the bandage shrink range and the maximum speed were concluded. The strengths of two kinds erf surface-mounted permanent magnet rotors were calculated and compared using contact finite element method. For buried type permanent magnet rotoT, the equivalent ring method was put forward to calculate its stress limit. The mathematical relationships between the maximum velocity and iron bridge thickness were deduced. Using finite element method, the stress distributions was analyzed. The research results have shown that the high speed permanent magnet rotors designed according to the method proposed here have the adequate mechanical strength.%针对高速永磁电机转子圆周线速度大,旋转产生的离心应力会损坏永磁转子的问题.对高速永磁转子强度进行研究,分析表面贴式永磁转子高速稳定运行的机械务件,建立了护套过盈量与最高转速的关系模型,在护套材料各向异性和各项同性的条件下,采用接触有限元法计算和比较两种表面贴式永磁转子的转子强度；针对深埋式永磁转子,采用等效环法对应力进行解析计算,建立了铁心桥厚度与最高转速的数学关系,并基于有限元法分析深埋式永磁转子的应力分布.仿真结果表明,根据所提方法设计的高速永磁转子在最高转速运行时具有足够的机械强度.