Analysis of rotor eddy current loss and thermal deformation of magnetic liquid double suspension bearing  

作　　者：LIU Hongmei YANG Guang SUN Yanan SUN Jian WANG Zhe ZHAO Jianhua 刘洪美;YANG Guang;SUN Yanan;SUN Jian;WANG Zhe;ZHAO Jianhua(Shijiazhuang Rail Transit Group Co.Ltd,Shijiazhuang 050011,P.R.China;Shijiazhuang Haishan Industrial Development Co.Ltd,Shijiazhuang 050200,P.R.China;Fluid Power Transmission and Control Laboratory,Yanshan University,Qinhuangdao 066004,P.R.China)

机构地区：[1]Shijiazhuang Rail Transit Group Co.Ltd,Shijiazhuang 050011,P.R.China [2]Shijiazhuang Haishan Industrial Development Co.Ltd,Shijiazhuang 050200,P.R.China [3]Fluid Power Transmission and Control Laboratory,Yanshan University,Qinhuangdao 066004,P.R.China

出　　处：《High Technology Letters》2024年第3期322-332,共11页高技术通讯（英文版）

基　　金：the Natural Science Foundation of Hebei Province(No.E2020203052);the S&T Program of Hebei(No.236Z1901G).

摘　　要：Magnetic-liquid double suspension bearing(MLDSB)is a new type of suspension bearing based on electromagnetic suspension and supplemented by hydrostatic supporting.Without affecting the electromagnetic suspension force,the hydrostatic supporting effect is increased,and the real-time coupling of magnetic and liquid supporting can be realized.However,due to the high rotation speed,the rotor part produces eddy current loss,resulting in a large temperature rise and large ther-mal deformation,which makes the oil film thickness deviate from the initial design.The support and bearing characteristics are seriously affected.Therefore,this paper intends to explore the internal effects of eddy current loss of the rotor on the temperature rise and thermal deformation of MLDSB.Firstly,the 2D magnetic flow coupling mathematical model of MLDSB is established,and the eddy current loss distribution characteristics of the rotor are numerically simulated by Maxwell software.Secondly,the internal influence of mapping relationship of structural operating parameters such as input current,coil turns and rotor speed on rotor eddy current loss is revealed,and the changing trend of rotor eddy current loss under different design parameters is explored.Thirdly,the eddy cur-rent loss is loaded into the heat transfer finite element calculation model as a heat source,and the temperature rise of the rotor and its thermal deformation are simulated and analyzed,and the influ-ence of eddy current loss on rotor temperature rise and thermal deformation is revealed.Finally,the pressure-flow curve and the distribution law of the internal flow field are tested by the particle image velocimetry(PIV)system.The results show that eddy current loss increases linearly with the in-crease of coil current,coil turns and rotor speed.The effect of rotational speed on eddy current loss is much higher than that of coil current and coil turns.The maximum temperature rise,minimum temperature rise and maximum thermal deformation of the rotor increase with the increase

关 键 词：magnetic-liquid double suspension bearing(MLDSB) oil film thickness cur-rent loss thermal deformation particle image velocimetry(PIV)test 

分 类 号：TH133.3[机械工程—机械制造及自动化]