轨道交通牵引电机轴承电流密度计算  

Calculation on Current Density of Traction Motor Bearings for Rail Transit

作　　者：奚强[1,2,3] 赵志晓 于晓凯 黄荣[4] 张博文 XI Qiang;ZHAO Zhixiao;YU Xiaokai;HUANG Rong;ZHANG Bowen(Luoyang Bearing Research Institute Co.,Ltd.,Luoyang 471039,China;China International Science and Technology Cooperation Base for Digitization Design of High Performance Bearings,Luoyang 471039,China;Henan Key Laboratory of High Performance Bearing Technology,Luoyang 471039,China;CRRC Nanjing Puzhen Co.,Ltd.,Nanjing 210031,China)

机构地区：[1]洛阳轴承研究所有限公司,河南洛阳471039 [2]高性能轴承数字化设计国家国际科技合作基地,河南洛阳471039 [3]河南省高性能轴承技术重点实验室,河南洛阳471039 [4]中车南京浦镇车辆有限公司,南京210031

出　　处：《轴承》2023年第4期21-25,共5页Bearing

基　　金：国家重点研发计划资助项目(2020YFB2007900)。

摘　　要：为评估电机轴承耐电蚀性能,以轨道交通牵引电机轴承为研究对象,将轴电压作为输入参数,考虑载荷、转速、润滑等应用条件以及轴承绝缘性能参数,建立简化等效电路模型,并根据轴承载荷、接触变形、润滑等基本理论,计算轴承受载情况与润滑油膜厚度,进而推导得到轴承油膜电容及电流密度的计算公式,推荐电流密度阈值为0.1 A/mm^(2)。以轨道交通用某型190 kW逆变驱动电机固定端6215深沟球轴承为例进行计算,轴承最大电流密度小于0.1 A/mm^(2),轴承无电蚀风险。In order to evaluate the electric erosion resistance of motor bearings,the insulated bearings for rail transit traction motor are used as research objects,the shaft voltage is taken as input parameter,the application conditions such as load,speed,lubrication and insulation performance parameters of the bearings are considered,and the simplified equivalent circuit model is established.According to basic theories of load,contact deformation and lubrication of the bearings,the load and lubricating oil film thickness of the bearings are calculated,and the calculation formulas of oil film capacitance and current density of the bearings are derived,the recommended current density threshold is 0.1 A/mm^(2).Taking 6215 deep groove ball bearing at fixed end of a 190 kW inverter drive motor for rail transit as an example,the maximum current density of the bearing is calculated less than 0.1 A/mm^(2),having no risk of electric erosion.

关 键 词：滚动轴承 绝缘轴承 深沟球轴承 电动机 等效电路 电容 电阻 电流密度 

分 类 号：TH133.331[机械工程—机械制造及自动化] TM32[电气工程—电机]