A new PWM method for conducted EMI reduction in inverter fed motor drive

With the advent of fast power devices, the high dv/dt produced by PWM inverters have been found to cause EMl noise, shaft voltage and bearing current. This paper describes the application of newly developed conducted EMI reduction technique of SVPWM in induction motor drives. The newly developed common mode voltage reduction SVPWM technique doesn´t use any zero-voltage vector states for inverter control. Hence it can restrict the common mode voltage better than conventional PWM technique. The validity of the proposed technique by software approach is verified through simulation and experimental results.