在高速永磁电机中，永磁体机械强度不足以承受高速旋转产生的离心力，需要用高强度非导磁金属护套来保护永磁材料。针对高速永磁电机中实心圆柱永磁转子结构，将转子的应力条件简化为平面应力问题，采用极坐标下的位移法，推导了非导磁金属护套保护的圆柱永磁转子强度解析公式。在此基础上，运用多维可视化算法研究了护套厚度、过盈量以及转速对转子强度的影响，对各多维可视化图形进行交集运算，得到了静态和高速运行状态下均满足强度要求的护套厚度及过盈量的可行域，在可行域中选择设计参数的最优值，最后，借助有限元法验证了设计方案的有效性。结果表明，本文提出的基于多维可视化的优化设计方法能够得到护套厚度及过盈量的集状解，便于实现鲁棒优化，具有直观、方便的特点。
关键词：高速永磁电机；强度计算；有限元；可视化算法
Abstract
In high-speed permanent magnet motor, the permanent magnet is not strong enough to bear the centrifugal force caused by high-speed rotation. A high strength and non-conductive metal sheath is needed to protect the permanent magnet material. For the structure of solid cylinder permanent magnet rotor in high speed permanent magnet motor, the stress condition of the rotor is simplified as a plane stress problem, and the analytical formulas for the strength of a cylindrical permanent magnet rotor with a non-magnetic metal sheath is derived by the displacement method in polar coordinate. On this basis, a multi-dimensional visualization algorithm is used to study the influences of sheath thickness, interference fit and rotation speed on rotor strength, and the feasible region of sheath thickness and interference fit , under both static and high-speed running conditions, are obtained through intersection operation among the multi-dimensional visualization maps in, subsequently, the optimal values of design parameters are selected in the feasible region. Finally, the validity of the design scheme is verified by the finite element method. The results show that the lumped solutions of the sheath thickness and interference fit can be obtained by the proposed optimal design method based on multi-dimensional visualization , and it is beneficial to achieve the robust optimization, with the advantages of direct viewing and convenience.
Key words: High-speed permanent magnet motor; strength calculation; Finite Element; Visualization algorithm.
关键词
高速永磁电机 /
强度计算 /
有限元 /
可视化算法
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Key words
High-speed permanent magnet motor /
strength calculation /
Finite Element /
Visualization algorithm.
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