非对称轴向磁悬浮轴承的结构设计和数值模拟  

Structure design and numerical simulation of axial active magnetic bearing with an asymmetric form

作　　者：张舒月 刘芳[1,2] 秦海玲 李青 伍继浩[1] Zhang Shuyue;Liu fang;Qin Hailing;Li Qing;Wu Jihao(State Key Laboratory of Technologies in Space Cryogenic Propellants,Technical Institute of Physics and Chemistry,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]航天低温推进剂技术国家重点实验室,中国科学院理化技术研究所,北京100190 [2]中国科学院大学,北京100049

出　　处：《低温与超导》2020年第10期12-17,35,共7页Cryogenics and Superconductivity

基　　金：国家重大科研装备研制项目(ZDYZ2014-1);航天低温推进剂技术国家重点实验室基金项目(SKLTSCP1603)资助。

摘　　要：磁悬浮冷压缩机作为2 K超流氦低温制冷系统的核心部件,工作于低温低压环境,转子转速高达50000 rpm。轴向磁悬浮轴承是为立式冷压缩机转子提供重力支撑及控制轴向定位的重要研究部件。基于冷压缩机的支撑需求,为得出更加合理的静态工作点设置,提出"上大下小"非对称形式的轴向磁轴承结构设计方法;并采用ANSYS Electronics Desktop数值模拟气隙磁场特性。计算结果表明,在偏置电流1.5 A的激励下,上、下磁轴承的磁通密度分别为0.42 T和0.31 T;在最大电流4.5 A作用下,承载力为721 N;电磁场和电磁力的模型近似解和数值解在静态工作点附近的误差分别限制在4%和5%以内,满足设计需求,验证了设计的合理性。As the core component of the 2 K superfluid helium cryogenic refrigeration system,magnetic suspension cold compressors with a rotor speed up to 50000 rpm,work in a low-temperature and low-pressure environment.The axial active magnetic bearing(AMB)is an important component providing gravity support and controlling axial position for the vertical cold compressor rotor.Based on the support requirements of cold compressors,to make the static working point more reasonable,this paper proposed the asymmetrical structure design method of"upper big and lower small"for the axial AMB;and used ANSYS Electronics Desktop to numerically simulate the magnetic field characteristics in air gap.Calculation results show that the magnetic flux density for the upper and lower AMB at the static operating point is 0.45 T and 0.35 T respectively;the AMB capacity with maximum current of 4.5 A is 672 N;near static operating point,errors between the approximate solution and numerical solution of the electromagnetic field and electromagnetic force models are limited to 4%and 5%respectively;meeting design requirements,and verifying the rationality of the design.

关 键 词：冷压缩机 轴向磁悬浮轴承 结构设计 模型校核 数值计算 

分 类 号：TK05[动力工程及工程热物理]