摘要
PWM变频器所产生的共模电压会在电机寄生电容的耦合作用下引起轴承电流,进而造成轴承电腐蚀,使得轴承过早失效。本文针对变频器控制电机中共模电压引起轴承电应力这一固有现象,分析了变频驱动电机中的电容耦合电流,并在此基础上提出了基于共模电流和轴承电流传输路径的轴承电腐蚀预防措施,以为降低轴承电应力提供解决方法。为了验证预防措施的有效性,又碍于现场直接测量轴承电流的局限性,本文还描述了相关的间接测量方法及其作用,为解决轴承电腐蚀问题提供了测试依据。
The common mode voltage produced by PWM inverter causes the bearing current under the coupling action of parasitic capacitance of the motor, which will lead to the premature failure of the bearing due to the electric corrosion of the bearing. In this paper, the capacitance coupling current in converter driven motor is analyzed, aiming at the inherent phenomenon of bearing electric stress caused by the common mode voltage of converter driven motor. On the basis of this, the preventive measures of bearing electric corrosion based on common mode current and bearing current transmission path are proposed to provide solutions for reducing bearing electric stress. In order to verify the effectiveness of preventive measures and the limitation of the direct measurement of bearing current in the field, the related indirect measurement methods and their functions are described.
作者
薛利晨
XUE Lichen(Tianjin Vocational College of Mechanics and Electricity,Tianjin 300350,China)
出处
《大电机技术》
2020年第4期45-51,共7页
Large Electric Machine and Hydraulic Turbine
关键词
变频驱动电机
轴承电腐蚀
轴承电流
轴电压
PWM
converter driven motor
electric corrosion of bearing
bearing current
shaft voltage
PWM
