模块化永磁直线游标电机等效磁网络及漏磁分析

在模块化永磁直线游标电机的初始设计及优化设计中,使用有限元方法(FEM)计算漏磁系数时需要耗费大量的建模和计算时间。针对这一问题,建立该种电机的等效磁网络模型,在建模期间,考虑气隙中的边缘效应,并计算永磁体组与定子齿在不同相对位置时的等效磁导,得到该种电机在一个周期内不同相对位置时的漏磁磁导和漏磁系数的数学解析表达式。采用FEM验证了该数学解析表达式的准确性。研究结果为模块化永磁直线游标电机的设计提供了理论依据。

Equivalent Magnetic Network and Flux Leakage Analysis of ModularLinear Permanent Magnet Vernier Machine

To avoid the huge time consumption in the initial and optimum design of modular linear permanent magnet vernier machine when finite element method (FEM) was used to calculate the flux leakage coefficient, the equivalent magnetic network model was established for the machine. During the modeling, the fringing effect in the airgap was taken into consideration, the equivalent permeances of the permanent magnet group and the stator teeth at different relative positions were calculated, and the mathematical analytical expressions of magnetic permeability and flux leakage coefficient of the machine at different relative positions in one cycle were obtained. Finally, the FEM method was used to verify the correctness and accuracy of the mathematical analytical expressions. The research results provided a theoretical basis for the design of modular linear permanent magnet vernier machines.