逆变器驱动电动机系统中轴承电流产生的机理研究  

Generation Mechanism of Bearing Currents in PWM Drive System

作　　者：幸善成[1] 吴正国[1] 

机构地区：[1]海军工程大学电气工程系,430033

出　　处：《电气应用》2005年第11期130-132,137,共4页Electrotechnical Application

摘　　要：分析了三相逆变器共模电压及感应电动机内部的寄生耦合效应,基于共模电压和共模耦合效应的概念,解释了PWM逆变器产生轴承电流的机理。Why a PWM inverter can cause a motor bearing current is explained. It is based on the conception of common mode voltage in all power electronic converters and the recognition of parasitic capacitive coupling in drive systems. The conception of common mode voltage and the principle of its generation are explained. The common mode voltage of a three phase inverter is presented. The parasitic capacitive couplings of an induction motor are discussed. Common mode voltages together with parasitic coupling effects are combined to give a theoretical prediction of possible currents into motor bearings.

关 键 词：寄生耦合效应 轴承电流 共模电压 

分 类 号：TM464[电气工程—电器] TM34