无轴承异步电机的最大径向力有限元分析

Magnetic Field Analysis of Bearingless Induction Motor Using Finite Element Analysis

无轴承电机是集成了径向磁轴承功能的高速电机 ,由于功率密度大、结构紧凑 ,它是大功率高速电机的发展趋势。本文利用有限元方法 (FEM)分析了无轴承异步电机的磁场 ,给出了磁场分布图 ,利用气隙磁密的分布计算了作用于转子的径向力。研究表明 ,径向力绕组电流和径向力大小之间的关系受电机磁饱和的影响 ,可计算出最大径向力。本文形象地揭示了无轴承异步电机的径向力产生机理 。

Bearingless motors are high speed electric machines combined with radial magnetic bearing functions. The compactness of bearingless motors suggests the possibility of high power and high speed motors. In this paper, flux distributions and radial force of a bearingless induction motors are analyzed employing the Finite Element Method. Relationships between the radial force and radial force winding currents are influenced by magnetic saturation. It was shown that the generated radial force reaches its maximum value due to magnetic saturation. The mechanism of radial force is defined and the analyzed results will be applied to derive more precise radial force model.