Homopolar型径向磁轴承转子涡流损耗的分析与优化  

Analysis and Optimization of Rotor Eddy Current Loss in Homopolar Radial Magnetic Bearings

作　　者：胡小飞 刘刚 孙津济 韩邦成 

机构地区：[1]惯性技术重点实验室,北京100191 [2]新型惯性仪表与导航技术国防重点学科实验室,北京100191

出　　处：《系统仿真学报》2013年第12期2961-2966,2972,共7页Journal of System Simulation

基　　金：国家杰出青年科学基金(60825305);国家"973"计划(2009CB 72400103);北京市优秀博士学位论文指导教师科技项目(20111000602)

摘　　要：采用永磁偏置径向磁轴承支撑的转子高速旋转时,转子内会产生过大的涡流损耗,进而引起热量过高,导致转子温度升高且分布不均匀,影响磁轴承系统的性能。采用Flux有限元软件对Homopolar型永磁偏置径向磁轴承转子的涡流损耗进行了三维时步有限元分析。在保持磁轴承承载力和气隙磁密不变的条件下,分析了磁轴承的结构参数,包括磁极个数、磁极极宽、气隙长度,对转子涡流损耗的影响。仿真结果表明:增加磁轴承的磁极数会使转子的涡流损耗先增加后减小;磁轴承的磁极极宽和气隙长度的增加可以有效地减少转子涡流损耗。根据以上分析结果,提出了降低磁轴承转子涡流损耗的方法,并对磁轴承进行了优化,为低功耗磁轴承的设计提供了参考。For rotor of PM-biased Hybrid Radial Magnetic Bearing （HRMB）, the eddy current losses will be significant when the speed is high. The large eddy current loss will cause significant heating of the rotor, so that temperature will rise and be uneven distribution in the rotor. The eddy current loss of rotor was studied with 3D time-stepping finite element analysis using Flux3D. Then the rotor eddy current loss was compared with different magnetic pole number, magnetic pole width, and airgap length, based on the invariable carrying capacity and airgap flux density. The results show that the rotor eddy current loss is found to first increase and then decrease as the magnetic pole number increases; rotor eddy current loss decreases significantly as the magnetic pole width and airgap length increases. The loss reduction techniques are advanced and the optimum HRMB is designed to reduce the eddy current loss according to the research. It is significant for the design of low-loss magnetic beating.

关 键 词：永磁偏置 径向磁轴承 转子涡流损耗 时步有限元 磁轴承优化 

分 类 号：TH133.3[机械工程—机械制造及自动化]