对转螺旋桨用永磁盘式对转电机磁场仿真分析

Simulation Analysis on the Magnetic Field of Permanent Magnet Disc Motor for Contra-Rotating Propellers

为了解决传统对转螺旋浆电力推进电机的成本高、定转子散热和输出转矩不平衡的问题,设计了一种新型结构的单定子、双转子永磁盘式对转电机。介绍了该电机的基本结构、运行原理和电机磁路特点,对电机内部对转磁场的耦合问题进行了分析,并引入等效磁路模型,同时给出了直角坐标系下,转子磁极表面的磁通密度公式,采用有限元法分析电机气隙磁场和平均半径处的气隙磁密。制造了一台盘式对转样机,并搭建试验平台测试了电机的三相感应电动势。测试结果表明:由于电机定子绕组端部长度的不对称,出现了三相感应电动势的不平衡现象。

In order to overcome the disadvantages of electric propulsion motor of contra-rotating propellers, de-signed a new structural permanent disc contra-rotating motor of single stator and double rotor. Described the motor’s basic structure, operating principle and magnetic circuit characteristics, analyzed the coupling problem of contra-rotating mag-netic field in the motor, and introduced the equivalent magnetic circuit model. In Cartesian coordinates, provided the magnetic flux density formula of rotor magnetic pole surface and analyzed the air gap magnetic field and the air gap flux density of the average radius by means of the finite element method. Made a disc contra-rotating motor prototype, and built an experimental platform to test the three-phase induction electromotive force of the motor. The test results show that due to the asymmetric length end of stator winding, the unbalanced three-phase induction electromotive force is found.