关键词: 永磁同步电机, 电磁场有限元分析, 非线性材料特性, 动网格, 牛顿迭代

Abstract: The material nonlinear characteristic and rotor movement need to be fully considered during the modelling of electrical machines by finite element analysis, which make the modelling face extra challenges in ensuring calculation accuracy and speed. A 36 - slot 6 - pole interior permanent magnet synchronous machine was taken as an example to construct its electromagnetic field finite element model by using the first order mesh. Periodic boundary conditions were
used to reduce the size of the solution domain, and the Newton iteration method was used to consider nonlinear material property. The moving band technology was used to accurately model the rotor motion. The combination of moving band and periodic boundary conditions could effectively ensure the constant dimension of the solution matrix, which was conducive to inheriting the magnetic vector at different rotor positions, and realized the convergence of Newton iteration by providing effective initial solutions. By comparing the results calculated by the proposed fast algorithm and the traditional finite
element algorithm, the accuracy and speed of the algorithm were verified.

Key words: permanent magnet synchronous machine, electromagnetic field finite element analysis, nonlinear material
property, dynamic mesh, Newton iteration