表贴式永磁电机漏磁导的解析计算

Calculation of leakage permeance in a surface-mounted permanent magnet machine

针对有限元法求解空载漏磁系数时计算量大的问题,采用磁路法全面考虑了永磁电机内部4不同漏磁通路径,并根据电机结构尺寸确定各漏磁通的积分区域,不但解决了磁路法在电机结构变化时漏磁系数计算不准确的问题,而且同时具备计算量小的优点。在极弧系数、气隙长度和永磁体厚度分别变化的情况下,漏磁系数的有限元结果与磁路法结果吻合,证明了该文所提出的漏磁导计算方法的准确性。该方法不需要复杂的有限元计算,尤其适用于电机优化设计。

No-load magnetic flux leakage factor calculation is time-consuming using the finite element method. The magnetic circuit method was used with four different magnetic flux leakage paths of the permanent magnet motor taken into account to eliminate the inaccuracy due to the motor structure changes by determining the integral flux leakage region according to the motor structure size,with a small calculation amount. Simulation results with the magnetic circuit and the finite element methods show the accuracy of the proposed method with changing arc coefficient,air-gap length and magnet height. The method without complex finite element numerical calculation is convenient and suitable for the permanent magnet machine design and optimization.