表贴式永磁电机碳纤维护套转子强度及过盈量分析

针对表贴式永磁电机转子在高速高温状态下转子强度计算问题,提出了考虑磁钢分块结构的转子模型。基于厚壁圆筒理论推导了转子强度计算的解析解,分别计算出碳纤维护套及磁钢的切向应力和径向应力；基于有限元法分析了多种工况下的转子强度,在高速及高温工况下转子所受应力均会增加；对比解析分析结果表明,有限元法及解析法均能准确计算碳纤维护套应力,而磁钢却受到边缘效应的影响,磁钢边缘应力增大,解析分析难以进行精准计算；基于有限元法分析护套与磁钢过盈量,优化了转子结构,提出了过盈量的最优范围。

Rotor Strength and Interference Analysis of Surface Mounted Permanent Magnet Motor with Carbon Fiber Sleeve Rotor

In view of the analysis of rotor strength of surface mounted permanent magnet motor in high speed and high temperature condition, a rotor model considering magnetic steel with block structure was proposed. Based on the theory of thick walled cylinder, the analytical solution was derived. The tangential and radial stresses of carbon fiber sleeve and magnetic steel were respectively calculated. Based on finite element method, the rotor strength under various working conditions was analyzed. The stress on the rotor would increase under both high speed and high temperature conditions. Compared with the analytical analysis results, it showed that the finite element method and the analytical method could accurately calculate the stress of the carbon fiber sleeve, while the magnetic steel stress would be affected by the edge effect, so that the analytical analysis could not perform accurate calculations. The interference amount between the sheath and the magnetic steel was analyzed by the finite element method, based on which the rotor structure was optimized and the optimal range of the interference amount was given.