外转子双凸极永磁电动机的有限元分析

Finite Element Analysis of Doubly Salient Permanent Magnet Motor With External Rotor

在双凸极变磁阻电机基础上,提出了一种外转子结构的双凸极永磁电动机并确定了其结构尺寸。针对该电机在不同转子位置角、不同电枢电流分别工作在单拍和双拍时的空载、负载以及电枢磁场单独作用的情况进行了基于场量的有限元数值计算,并进一步得出了该电机的静态参数特性曲线。分析表明,相对于双凸极变磁阻电机而言,由于该电机高磁阻高矫顽力的永磁体的存在,电机电枢磁链只能通过相邻极闭合而不能穿过磁钢匝链到其他相,使得绕组电感特性发生了变化。电枢磁通对永磁磁通增磁或去磁特性改变了永磁磁链的流向。电机由半周期控制运行模式变为全周期控制运行。

This paper proposes a doubly salient permanent magnet motor with external rotor on the base of the doubly salient varied reluctant motor, and appoints its structure and size, It makes f＇mite element analysis on the motor based on the field arguments in the terms of no-loading, loading and single armature field, thinking of different rotor angle, different armature current, single pulse and double pulse working mode. It gets the static parameters curves for the motor. In contrast to the doubly salient varied reluctant motor, the armature flux-linkage ean circle only by adjacent poles, but does not circle by crossing magnet because of the permanent magnet which has high reluctance and resistance, which makes characteristics of the armature windings induction vary. The characteristics of strengthening or weakening armature field versus permanent field makes orientation of permanent magnetic flux-linkage vary. The motor performs from half circle mode to whole circle mode.