Analysis of bearing faults in metro vehicle traction motors and improvement measures
This article addresses the recurrent traction motor bearing faults in the A4 type trains of Guangzhou metro line 2.Through on-site investigations and experimental tests,detailed analyses were conducted on the bearing condition,fault modes,and types of damage.The findings revealed that the bearing faults were primarily caused by fatigue failure modes induced by radial forces,electrical erosion,electrical discharge sparks,and axial forces.To remedy these issues,a series of solutions were proposed.Firstly,the use of new materials to enhance the quality and reliability of the bearings is recommended.Secondly,improvements are suggested to mitigate electrical corrosion,reducing the damage caused by electrical erosion and discharge sparks on the bearings.Finally,determining an appropriate range of axial forces through shaft voltage testing can prevent excessive axial forces leading to fatigue failure of the bearings.The implementation of a combination of ceramic bearings on the drive end and grounding rings successfully resolved the frequent bearing fault issues in A4-type trains,proving highly effective.Subsequently,after introducing the modified project into the Guangzhou metro line 2 and Guangfo line,the bearing burnout problem did not recur during 4 years of operations.This research holds theoretical and practical value by providing a useful reference for addressing similar issues and enhancing the reliability and operational efficiency of rail transit trains,thereby ensuring a safer and more comfortable travel experience for passengers.
metrovehicletraction motor bearingceramic bearinggrounding ringshaft voltage
万方数据
维普
