无润滑电磁轴承保护轴承跌落过程摩擦发热分析  

Analysis for Friction Heating Power of Non-lubricated Auxiliary Bearing of Electromagnetic Bearing during Rotor Drop

作　　者：刘兴男[1,2,3] 陈国辉 王茗萁 时振刚 莫逆[1,2,3] LIU Xingnan;CHEN Guohui;WANG Mingqi;SHI Zhengang;MO Ni(Institute of Nuclear and New Energy Technology,Tsinghua University,Beijing 100084,China;Collaborative Innovation Center of Advanced Nuclear Energy Technology,Beijing 100084,China;Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education,Beijing 100084,China;Guangzhou Chuangyi Technology Co.,Ltd.,Guangzhou 511455,China)

机构地区：[1]清华大学核能与新能源技术研究院,北京100084 [2]先进核能技术协同创新中心,北京100084 [3]先进反应堆工程与安全教育部重点实验室,北京100084 [4]广州创依科技有限公司,广东广州511455

出　　处：《原子能科学技术》2024年第S01期131-140,共10页Atomic Energy Science and Technology

基　　金：中核集团“青年英才”项目(20212009054);国家科技重大专项(ZX069)。

摘　　要：为在设计阶段预测电磁轴承保护轴承的寿命,计算跌落过程中保护轴承的发热功率非常重要。很多场合下保护轴承无润滑或只有固体润滑,因此选择局部法,重点分析球与滚道之间的滚动弹性滞后、球自旋、差动滑动等机制引起的发热,推导了差动滑动发热功率解析公式。开展实际电磁轴承高速电机无制动自由跌落实验,实测轴心轨迹和保护轴承冲击力,利用实验数据计算了保护轴承发热功率,并与实测转子动能变化率对比。研究发现,在确定了保护轴承安装预紧力情况下,局部法计算的保护轴承发热功率与转子动能变化率在量级上相当,证明了理论计算可行性;球自旋发热最多,其次是球与滚道差动滑动发热,两者之和占总发热的主要部分,球与滚道弹性滞后发热较少。In order to predict the life of the auxiliary bearing in the design stage,it is crucial to calculate the friction heating power of the auxiliary bearing during the rotor drop process.In many cases,the auxiliary bearing has no lubrication or only solid lubrication.Therefore,the local method was chosen to calculate the friction power,focusing on analyzing the rolling elastic hysteresis power between the ball and raceway,the spin power of the ball and the differential sliding power between the ball and raceway.The calculation formulas of these powers were provided in this paper,along with the derivation of an analytical formula for the differential sliding power,which facilitates practical applications.These formulas are based on the quasi-static analysis and the raceway control theory.When the rotation speed of the inner ring of the auxiliary bearing,the radial force acting on the auxiliary bearing and the axial preloading force are all known,the friction heating power of the auxiliary bearing can be calculated by these formulas.The free drop experiment of an electromagnetic bearing high-speed motor without braking was carried out to test the calculation,under 3000,5400,and 6600 r/min.The rotor axis trajectory and the horizontal and vertical impact force acting on the auxiliary bearing were measured.The rotation speed of the inner ring of the auxiliary bearing was assumed to be the same as the speed of the rotor,calculated by the rotor axis trajectory.The radial force acting on the auxiliary bearing was calculated based on the horizontal and vertical impact force.The axial preloading force,which is about 410 N in this paper,was determined by the experimental data under 3000 r/min with the method of trial calculation.With these parameters,the friction heating power of the auxiliary bearing was calculated,and compared with the change rate of the kinetic energy of the rotor observed in the experiment.It is found that the heating power calculated by the local method is approximately equivalent to the change rate of the

关 键 词：电磁轴承 保护轴承 转子跌落 摩擦发热 摩擦力矩 

分 类 号：TL99[核科学技术—核技术及应用] TH133.33[机械工程—机械制造及自动化]