轴向力偏转五自由度永磁偏置磁轴承及磁路解耦设计  

Axial Force Tilting Permanent-magnet-biased Magnetic Bearing With Five Degrees of Freedom and Magnetic Field Decoupling Design

作　　者：王曦[1] 房建成[1] 樊亚洪[1] 孙津济[1] 

机构地区：[1]"惯性技术"国防科技重点实验室(北京航空航天大学),北京市海淀区100191

出　　处：《中国电机工程学报》2011年第17期91-98,共8页Proceedings of the CSEE

基　　金：国家杰出青年科学基金(60825305);国家重点基础研究发展计划项目(973项目)(2009CB72400103)~~

摘　　要：为了提高空间用磁悬浮飞轮输出偏转力矩的能力和精度,提出一种利用轴向力控制转子径向偏转的五自由度永磁偏置磁轴承(permanent-magnet-biased magnetic bearing withfive degrees of freedom,5-DOF-PMB),有效减小了飞轮体积和转子轴向长度,提高了系统的集成度,改善了转子系统的固有模态和稳定性。有限元仿真表明,按照角动量为15 N?m?s飞轮的要求设计的轴向力偏转5-DOF-PMB可同时满足各自由度负载的要求。为了提高转子径向大偏移时主动振动的控制精度,进一步对轴向力偏转5-DOF-PMB径向通道进行了磁路解耦设计。等效磁路分析与有限元仿真表明,经磁路解耦的5-DOF-PMB径向通道间磁路耦合程度削弱了2个数量级。最后从等效磁路和结构设计角度,对永磁偏置磁轴承的磁路解耦设计方法进行了归纳和总结。To satisfy the requirement of the tilting moment ability and precision of magnetically suspended flywheel on sPacecraft, a novel permanent-magnet- biased magnetic bearing with five degrees of freedom （5-DOF-PMB） was presented, which applied axial force to control rotor tilting motion to obtain high stability with improved intrinsic modal of rotor, and was also beneficial for increasing system-integrated-level. It was verified by finite element analysis （FEA） simulating that 5-DOF-PMB designed based on the 15 N.m.s reaction flywheel could support full loads on all degrees of freedom simultaneously. To satisfy the requirement of high control precision of rotor vibration on large excursion, magnetic field decoupling design for 5-DOF-PMB was accomplished. It was verified by equivalent-magnetic-circuit method and FEA simulating that the magnetic field coupling between two radial channels was weakened in two orders after decoupling design for 5-DOF-PMB. Further, a universal method to decouple magnetic field of PMB was generalized.

关 键 词：磁轴承 永磁偏置 五自由度 磁路解耦 

分 类 号：TH133[机械工程—机械制造及自动化]