Prądy łożyskowe i prąd uziomu w układach napędowych zasilanych z falowników PWM

The paper presents analysis of forming of the induction motor bearing currents and leakage currents. In chapter 2 the causes at common-mode voltage and shaft voltage formation are described. That voltages are both the cause of EDM bearing currents forming. In chapter 3 are presented different types of parasitic phenomena caused by common-mode voltage. Internal capacitances of the induction motor is shown in Fig.5. Figure 8 shows EDM bearing currents formation. Leakage currents in induction motors supplied from PWM Inverter are presented in chapter 4. Chapter 5 describes methodes for limiting bearing currents in PWM drives.