考虑轴承径向游隙变化和电动机气隙偏心的轨道车辆牵引电机轴承等效电容计算  

Calculation of Equivalent Capacitance of Traction Motor Bearings for Rail Vehicle Considering Radial Clearance Variation of Bearings and Air Gap Eccentricity of Motor

作　　者：熊峰 师蔚[1] 廖爱华[1] 胡定玉[1] XIONG Feng;SHI Wei;LIAO Aihua;HU Dingyu(School of Urban Railway Transportation,Shanghai University of Engineering Science,Shanghai 201620,China)

机构地区：[1]上海工程技术大学城市轨道交通学院,上海201620

出　　处：《轴承》2023年第10期49-56,共8页Bearing

摘　　要：考虑轴承径向游隙变化和电动机气隙偏心,基于赫兹接触理论将轴承等效电容分为赫兹接触电容和非赫兹接触电容,建立轴承等效电容计算模型,基于该模型分析了热稳定过程中滚子与滚道之间的间隙、最大径向载荷、赫兹接触面积、赫兹接触电容和非赫兹接触电容的变化,结果表明:滚子与滚道之间的间隙随温度升高先减小后趋于稳定,最终小幅增加;滚子最大径向载荷随温度升高先减小后趋于稳定;赫兹接触面积随温度升高先减小后增大;赫兹接触电容和非赫兹接触电容随温度升高先增大后趋于稳定。通过与有限元法对比验证了轴承等效电容计算模型的正确性,即热稳定过程中轴承等效电容随温度升高先增大后趋于稳定。轴承电压和EDM电流的计算结果表明,二者均随温度升高逐渐增大,且电动机气隙偏心度增大会使EDM电流增大,加剧轴承电腐蚀。Considering the radial clearance variation of bearings and air gap eccentricity of motor,the equivalent capacitance of bearings is divided into Hertz contact capacitance and non-Hertz contact capacitance based on Hertz contact theory,and the calculation model of equivalent capacitance of bearings is established.The variations of clearance between roller and raceway,maximum radial load,Hertz contact area,Hertz contact capacitance and non-Hertz contact capacitance during thermal stability process are analyzed based on this model.The results show that:the clearance between roller and raceway first decreases with the increase of temperature,then tends to be stable,and finally increases slightly;the maximum radial load of roller first decreases and then tends to be stable with the increase of temperature;the Hertz contact area first decreases and then increases with the increase of temperature;the Hertz contact capacitance and non-Hertz contact capacitance first increase and then tend to be stable with the increase of temperature.Compared with finite element method,the correctness of analytical calculation model of equivalent capacitance of bearings is verified,that is,the equivalent capacitance of bearings first increases and then tends to be stable with the increase of temperature during thermal stability process.The calculation results show that the voltage and EDM current of bearings increase gradually with the increase of temperature,and the increase of air gap eccentricity of motor will increase the EDM current and aggravate the electric corrosion of bearings.

关 键 词：滚动轴承 圆柱滚子轴承 径向游隙 质量偏心距 电容 温度 

分 类 号：TH133.332[机械工程—机械制造及自动化] TM305[电气工程—电机]