无轴承交替极永磁电机磁极形状优化设计  

Magnet shape optimization for bearingless consequent-pole PM motor

作　　者：丁强[1,2] 邓智泉[1] 王晓琳[1] 

机构地区：[1]南京航空航天大学自动化学院,江苏南京210016 [2]南京工业职业技术学院能源与电气工程学院,江苏南京210023

出　　处：《电机与控制学报》2017年第1期69-76,共8页Electric Machines and Control

基　　金：国家自然科学基金(50977043)

摘　　要：为了优化无轴承交替极永磁电机性能,从转子结构入手分析交替极转子结构及绕组形式对空载反电势、齿槽转矩等空载特性的影响,提出一种转子磁极离心的磁极形状优化设计方法。通过对比磁极优化前后空载和负载性能发现磁极形状优化对抑制反电势谐波、减小齿槽转、降低转矩脉动等具有积极意义,但同时也导致平均转矩和平均悬浮力的损失。为弥补平均转矩和悬浮力损失,提出采用适当增加转子外径、减小气隙长度的设计方法。最后利用有限元分析对比结构优化前后的基本电磁特性,电机转矩常数由0.155 N·m/A升至0.181 N·m/A,转矩脉动由30.4%降为12.1%;额定悬浮力由14.6 N升至23 N,悬浮力脉动由8%降为7.8%,最大径向耦合由7%升至7.7%。To the influence improve performance of bearingless consequent-pole permanent magnet motors, by analyzing of consequent-pole rotor and winding configuration on no-load back-EMF and cogging torque, a centrifugal magnet pole shape optimization method was proposed. The optimization method can increase sinusoidal degree of back-EMF, lower cogging torque and suppress torque ripple when comparing no-load and on-load performance before and after shape optimization. However, it can simultaneously lead to losses of average torque and average suspension force. To overcome these disadvantages, one method was presented by increasing rotor outer diameter and decreasing air-gap length. Finally, finite el- ement analysis was carried out for verification of effectiveness for the proposed method. The results show that the torque constant increases from 0. 155 N · m./A to 0. 181 N · m/A, the peak-to-peak torque rip- ple decreases from 30.4% to 12.1%. Additionally, rated suspension force increases from 14.6 N to 23 N, the peak-to-peak suspension force ripple decreases from 8% to 7.8% and maximum radial coupling increases from 7 % to 7.7 %.

关 键 词：无轴承电机 交替极 绕组函数 磁极形状 电磁特性 

分 类 号：TM343[电气工程—电机]