无轴承薄片电机磁体形状优化设计及系统实现

Optimization of PM Shape of Bearingless Slice Motors and System Realization

无轴承永磁薄片电机引起了工业界的关注。这种电机集电机与磁轴承于一体,并利用被动磁悬浮与主动磁悬浮相结合的方法简化了结构、降低了成本。因其独特的结构,无轴承永磁薄片电机的径向悬浮性能对其各自由度悬浮性能有较大的影响,同时其集成度高,对损耗有较严格的要求。该文从这2个方面出发提出了一种基于有限元分析的表贴式永磁无轴承薄片电机永磁体形状的优化设计方法。仿真与实验证明,永磁体经优化设计后,其转子磁场谐波含量非常小,损耗小,悬浮力脉动小,易于获得良好的悬浮性能。

Recently, the bearingless permanent magnet （PM） slice motor has attracted the attention of industry. The magnetic bearing is integrated into the PM motor, the structure is very simply, and the cost is decreased tremendously. But the radial suspension of the bearingless PM slice motor affects the suspension in the other 3 freedom degrees deeply, and high integration cause a critical demand of loss control. In older to improve the suspension performance and reduce the loss, a new method of optirnization of PM shape which is based on FEM is proposed in this paper. The results of FEM and experiment show that the harmonic component is very small and the pulse of suspension force is almost eliminated after optimization. And it is easy to realize less loss and obtain a good performance.