基于混合有限元解析法的永磁同步电机永磁体电涡流损耗估计

永磁同步电机永磁体受限于热约束,无法在温度较高的环境下运行,故需减少永磁体上的电涡流损耗,从而降低永磁体上的温度。针对使用有限元法对永磁体电涡流损耗估算时间较长,以及使用解析法估算时难以达到与有限元法相同的精度,采用混合有限元解析法估算永磁体上的电涡流损耗。结合电涡流的反作用,在模拟电机旋转时,无需重复划分三角形区域；使用MATLAB软件仿真模拟,将混合有限元解析法与Galerkin有限元法对比,减少三角形区域划分的个数。由此验证了永磁体上电涡流损耗符合端部效应以及集肤效应的特征,在保证精度的同时,减少了仿真的时间。

Estimation of Permanent Magnet Eddy Current Losses in Permanent Magnet Synchronous Motor Based on Hybrid AnalyticalFEM

Permanent magnet of permanent magnet synchronous motor was limited by the thermal constraints and could not operate in high temperature environment. Therefore, it was necessary to reduce the eddy current loss on permanent magnet so as to lower the temperature on permanent magnet. In view of the long calculation time of the eddy current loss estimation of permanent magnets by finite element method (FEM) and the difficulty of achieving the same accuracy as the FEM when using the analytical method, the hybrid analyticalFEM to estimate the eddy current loss of permanent magnets was adopted, and the reaction field of eddy current was taken into account. When simulating the rotation of motors, there was no need to repeat the triangle mesh division. By using MATLAB software, the hybrid analyticalFEM was compared with the Galerkin FEM, which reduced the number of triangles. The characteristic of the end effect and the skin effect of the eddy current losses on the permanent magnet were validated. The hybrid analyticalFEM could ensure the accuracy and reduce the simulation time.