一种应用于精密隔振平台的双曲线磁通磁轴承设计  

A design of magnetic bearing with hyperbolic magnetic flux for precision vibration isolation platform

作　　者：孟祥瑞 王常虹[1] 钟佳朋 夏红伟[1] MENG Xiangrui;WANG Changhong;ZHONG Jiapeng;XIA Hongwei(School of Astronautics,Harbin Institute of Technology,Harbin 150001,China)

机构地区：[1]哈尔滨工业大学航天学院,哈尔滨150001

出　　处：《中国惯性技术学报》2024年第10期1025-1034,1042,共11页Journal of Chinese Inertial Technology

基　　金：国家重点研发计划(2020YFC2200604)。

摘　　要：针对精密隔振系统磁轴承存在悬浮力密度小、波动大以及耦合力大问题,设计了一种双曲线磁通结构的磁轴承(MBHFM)。首先利用等效电流法和永磁体镜像法推导了带有磁轭的双曲线磁通的磁轴承的气隙磁场和悬浮力的表达式,并分析了磁轴承悬浮力波动对隔振性能的影响。其次根据双曲线磁通的磁轴承悬浮力线性分布特点,采用电流前馈补偿方法使磁轴承获取更低悬浮力波动的恒定悬浮力。最后,对双曲线磁通的磁轴承与常见的双边Halbach结构磁轴承(MBBH)进行了仿真分析与测试。仿真结果表明所设计双曲线磁通的磁轴承样机静态悬浮力平均值为153.75 N,静态耦合力系数为0.42%,电流前馈补偿后合成悬浮力波动系数为0.15%,较双边Halbach结构磁轴承静态悬浮力密度提高了20%,静态耦合力系数减小了72.2%,合成悬浮力波动系数减小了89.3%。测试结果进一步验证了所设计样机的高性能。A magnetic bearing with hyperbolic flux magnetic(MBHFM)is proposed which is used to address the issues of low levitation force density,large fluctuations,and high coupling force in precision isolation system.First,the expressions for the air gap magnetic field and levitation force of MBHFM with magnetic yoke are derived by using the equivalent current method and the permanent magnet mirror method.And then the relationship between the levitation force fluctuations and isolation performance is analyzed.Second,based on the linear distribution characteristics on the levitation force of MBHFM,a current feedforward compensation method can be used to obtain constant levitation force with smaller levitation force fluctuations.Finally,simulation analysis and testing are conducted between MBHFM and existing magnetic bearing with bilateral Halbach(MBBH).The simulation results show that the average static levitation force of the designed MBHFM prototype is 153.75 N,the static coupling force coefficient is 0.42%,and the fluctuation coefficient of the synthesized levitation force after current feedforward compensation is 0.15%.Compared with MBBH,the static levitation force density increased by 20%,the static coupling force coefficient decreased by 72.2%,and the composite levitation force fluctuation coefficient decreased by 89.3%.The test results further validated the high performance of the designed MBHFM prototype.

关 键 词：双曲线磁通的磁轴承 隔振平台 气隙磁场 力特性 悬浮力前馈补偿 

分 类 号：U666.1[交通运输工程—船舶及航道工程]