关键词: 轴承电蚀, 共模电压, 变流器, 主电路拓扑结构, 脉宽调制策略

Abstract: Bearing corrosion has always been one of the problems that plague motor developers. The analysis of a large number of motors with bearing erosion shows that the motor powered by variable frequency power supply is most prone to bearing corrosion, and it is found that the converter common mode voltage is one of the important factors leading to bearing corrosion. Based on the simulation model of the traction transmission system of metro vehicles, the influence mechanism of the converter common-mode voltage on bearing corrosion was deeply analyzed from two aspects: the topology of the main circuit of the converter and the pulse width modulation strategy. The results can provide strong theoretical support for the formulation of the bearing corrosion suppression scheme.

Key words: bearing electric corrosion, common-mode voltage, converter, main circuit topology, pulse width modulation( PWM)