基于组合磁极的无轴承永磁同步电机转子优化设计  

Rotor optimization design of bearingless permanent magnet synchronous motor based on modular poles

作　　者：朱熀秋[1] 程一峰 ZHU Huang-qiu;CHENG Yi-feng(School of Electrical and Information Engineering,Jiangsu University,Zhenjiang 212013,China)

机构地区：[1]江苏大学电气信息工程学院,江苏镇江212013

出　　处：《电机与控制学报》2020年第3期123-130,共8页Electric Machines and Control

基　　金：国家自然科学基金(61973144,51675244);江苏省重点研发计划项目(BE2016150)。

摘　　要：无轴承永磁同步电机是一种正弦波驱动的电机,气隙磁场的正弦性影响着电机的性能,为了获得较小的转矩脉动和悬浮力脉动,提出了永磁体采用组合磁极的特殊结构。首先阐述了该结构对改善气隙磁场正弦性的作用,推导出了新的数学模型。其次,基于有限元分析,利用田口法正交试验,以电机的电磁转矩脉动与转矩平均值的比值和悬浮力脉动与悬浮力平均值作为评价标准,优化设计了磁极参数。最后将优化后的组合磁极式BPMSM与传统的单一磁极的BPMSM对比分析,结果显示,优化后的电机空载气隙磁密波形得到了明显改善,在保证转矩和悬浮力大小的基础上,转矩脉动和悬浮力脉动显著减小。The bearingless permanent magnet synchronous motor( BPMSM) is driven by sinusoidal wave,so the performance of motor is affected by sinusoidal shape of the air-gap magnetic flux distribution. To reduce the torque ripples and suspension force ripples,a special structure called modular permanent magnet poles is proposed. Firstly,the effect of the structure to improve sinusoidal shape of the air-gap magnetic flux distribution was described. Then,a mathematical model is deduced. Secondly,taguchi method was employed to optimize magnetic pole parameters where the ratio of torque ripples to average torque and the ratio of suspension force ripples to average suspension force were chosen as an objective function. Finally,conventional BPMSM with common pole and the BPMSM with modular pole were compared. The results show that the optimized no-load air-gap flux density waveform is significantly improved and lower torque ripples and suspension force ripples are produced based on almost the same average torque and suspension force.

关 键 词：无轴承永磁同步电机 组合磁极 田口法 转矩脉动 悬浮力脉动 

分 类 号：TM303[电气工程—电机]