磁悬浮飞轮用嵌环式永磁偏置径向磁轴承  

Thimble Permanent-magnet-biased Radial Magnetic Bearing for Magnetically-suspended-flywheel

作　　者：王曦[1] 房建成[1] 樊亚洪[1] 刘虎[1] 王春娥[1] 文通[1] 孙津济[1] 

机构地区：[1]北京航空航天大学'惯性技术'国防科技重点实验室,北京100191

出　　处：《机械工程学报》2011年第14期171-183,共13页Journal of Mechanical Engineering

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(973计划;2009CB72400103)资助项目

摘　　要：为满足航天用扁平转子磁悬浮飞轮对低功耗磁轴承的需求,提出一类同极性嵌环式永磁偏置径向磁轴承(Radial permanent-magnet-biased magnetic bearing,RPMB),旋转损耗低,工作气隙径向内外双环、轴向同层分布,径向磁力为平面汇交力系,具有磁极轴向短、可灵活设计的独特优势。根据全主动、主被动两类磁悬浮飞轮的不同需求,采用磁路分析与有限元仿真的方法,对磁极对齐型、磁极交错型、磁极偏置型三种嵌环式RPMB进行了有针对性的分析与设计,所设计的全主动磁悬浮飞轮,具有轴向长度短、质量小、精度高的优点;所设计的两轴主动磁悬浮飞轮,经优化设计,具有高被动刚度、高电流刚度、电流刚度高稳定性的优点。To satisfy the requirement on low-power magnetic bearings of magnetically-suspended-flywheel（MSFW） with flat rotor applied in spacecraft,a class of radial permanent-magnet-biased magnetic bearing（RPMB）,named thimble-RPMB,is presented.It is homopolar,so it has low rotational loss.Its poles have short axial length and flexible pole-arrangement,because its working gaps distribute along two concentric circles in only one layer,and radial magnetic forces are concurrent in one plane.According to different requirements of completely-active MSFW and 2-axis-active MSFW,3 species of thimble-RPMB are analyzed and designed,namely,pole-aligned,pole-interlaced and pole-biased,by the equivalent-magnetic-circuit method and FEA simulation.The designed completely-active MSFW has short axial length,light weight,and high precision.The optimally designed 2-axis-active MSFW has high passive stiffness,high current stiffness,and high stability of current stiffness.

关 键 词：磁悬浮飞轮 永磁偏置磁轴承 刚度 磁路解耦 容错 

分 类 号：TH133[机械工程—机械制造及自动化]