Analysis of a new PWM method for conducted EMI reduction in a field oriented controlled induction motor

The prevalence of EMI noise problems has been considered many times over the past few years, in inverter fed motor control systems. The advent of high speed power devices, and the high dv/dt of switching devices, has resulted in EMI problems and leakage current. This paper describes the application of the newly developed EMI reduction technique of SVPWM in induction motor drives. This newly developed common mode voltage reduction SVPWM technique does not use any zero-voltage vector states for inverter control, hence can restrict the common mode voltage more efficiently than the conventional PWM technique. The validity of the proposed technique is verified through simulation and experimental results. In this paper, by applying the vector control system, the proposed technique is presented as superior in reducing EMI and equal control performance, compared to the conventional space-vector PWM technique.