分裂齿集中绕组永磁游标电机电磁转矩特性分析

Analysis of Electromagnetic Torque Characteristic of Permanent Magnet Vernier Motor with Split Pole and Concentrated Winding

为了研究分裂齿集中绕组永磁游标电机(PMVM)的电磁转矩特性,基于磁场调制原理建立PMVM的磁动势磁导模型,给出永磁体和电枢绕组单独作用下气隙磁密谐波的次数和转速表达式,分析产生平均转矩和转矩脉动的谐波次数。采用麦克斯韦应力张量法计算各主次谐波产生转矩的大小,确定各主次谐波对电磁转矩的影响。通过有限元分析对结果进行了验证。结果表明:PMVM的电磁平均转矩绝大部分由16次谐波产生,占比98.83%,转矩脉动主要由16、34、48次谐波产生,占比52.29%。PMVM电磁平均转矩的来源主要为永磁体产生的气隙磁密基波,因此可改变永磁体的用量和形状增大其产生的气隙磁密基波以提升PMVM电磁转矩性能。

In order to study the electromagnetic torque characteristics of permanent magnet vernier motor(PMVM)with split teeth and concentrated windings,based on the magnetic field modulation theory,the magnetomotive force permeance model of PMVM was established.The expression of the number and speed of the air gap magnetic density harmonics under the independent action of the permanent magnet and armature winding was given.The harmonics number that generated the average torque and torque ripple was analyzed.Maxwell stress tensor method was used to calculate the torque generated by each dominating harmonics,and the influence of each dominating harmonics on electromagnetic torque was determined.The analysis results were verified by finite element analysis.The results show that the electromagnetic average torque of PMVM is mostly generated by the 16th harmonic,accounting for 98.83%,and the torque ripple is mainly generated by the 16th,34th and 48th harmonic,accounting for 52.29%.The source of PMVM electromagnetic average torque is mainly the air gap magnetic density fundamental harmonic of the permanent magnet,so the amount and shape of the permanent magnet can be changed to increase the air gap magnetic density fundamental harmonic generated by it to improve the electromagnetic torque performance of PMVM.