不等厚磁极永磁电机解析法分析

Analytical Calculation of Permanent Magnet Machines with Unequal Thickness Magnets

采用等效面电流的解析法求解不等厚磁极永磁电机的性能。推导在内弧偏心情形下,径向磁化和平行磁化无槽永磁电机的气隙磁密解析式;引入相对磁导函数,求解有槽电机的气隙磁密,进一步得到电机的反电动势以及电磁转矩等参数。对一台不等厚磁极永磁电机,给出了解析法计算结果。通过有限元法验证了该解析法的正确性。

The performances of a permanent magnet （PM ） machine with unequal thickness magnetic poles were solvedby an analytical method with equivalent surface current. The air-gap flux density distribution in a slotless PM machine wasobtained analytically for the inner arc eccentric. For the slotted PM machine, the air-gap flux density was derived throughthe relative permeance function. In addition, the back electromotive force and electromagnetic torque were also derived.The analytical results were presented for a PM machine with unequal thickness magnetic poles and were verified by a finiteelement method.