基于磁动势星形图的无轴承永磁电机悬浮绕组结构优化设计  

Optimization Design Methods of Concentrated Levitation Winding Structures in Bearingless Permanent Magnet Motors Based on the Magnetic Motive Force Star Graph

作　　者：武谷雨 丁强[1] 王晓琳[1] 邓智泉[1] 

机构地区：[1]南京航空航天大学自动化学院电气工程系,江苏省南京市211111

出　　处：《中国电机工程学报》2016年第21期5930-5938,6037,共9页Proceedings of the CSEE

基　　金：江苏省普通高校研究生科研创新计划项目(SJLX15_0114);中央高校基本科研业务费专项资金资助~~

摘　　要：考虑到无轴承交替极永磁电机中传统集中式绕组悬浮力脉动大、径向耦合度强等问题,该文分析了3种绕组样式的磁动势各次谐波星形图。从抑制悬浮磁势谐波和增大基波角度,提出了基于磁动势星形图的绕组分析设计方法,通过合理叠加样式1与样式2,增添辅助绕组构成改进型绕组结构来提高悬浮性能。该方法适用于带齿槽效应的无轴承永磁电机集中绕组优化设计。在上述改进型绕组结构基础上,提出通过解析磁动势来优化绕组系数,并从单相和三相两个角度实现抑制谐波磁动势,并分析了两种方法的优劣及内在联系。最后,从理论和有限元角度对比优化前后的集中式绕组结构的悬浮性能。有限元分析发现悬浮力脉动率由21.81%下降至0.99%,最大径向耦合度由26.03%降至4.66%,验证了文中所提优化方法的有效性。In consideration of undesirable interaction between radial degrees of freedom and great levitation force ripples in a bearingless consequent-pole permanent magnet motor with conventional concentrated levitation winding structures, the magnetic motive force（MMF） star graphs of three type winding structures were presented. To suppress the levitation MMF harmonic components and to increase the levitation MMF fundamental component, a novel and graphical optimization design method for levitation winding structures was proposed for the first time, which was based on MMF star graphs. And an improved three-phase concentrated levitation winding structure with sub-coils can be obtained by properly superimposing first type and second type to improve the levitation performance. It is noteworthy that the proposed optimization method is applicable to concentrate winding design in bearingless permanent magnet motors with cogging effects. Based on the above improved winding structure, the levitation MMF expression is used for optimizing the winding factor from the perspective of single-phase and three-phase. Then the comparison and intrinsic link of the two perspectives were analyzed. Finally, levitation performance comparisons between before and after optimization were carried out by theoretical and finite element analysis, respectively. The results show that the levitation force ripple is reduced from 21.81% to 0.99% and radial coupling from 26.03% to 4.66%, which verify the effectiveness of the novel optimization design method based on MMF star graphs.

关 键 词：磁动势星形图 齿槽效应 集中式绕组结构 优化设计方法 辅助绕组 悬浮磁动势解析 

分 类 号：TM343[电气工程—电机]