A survey of output filter topologies to minimize the impact of PWM inverter waveforms on three-phase AC induction motors

Three-phase output filters have been developed to a mature level with improved power quality in terms of over voltage transients at motor terminals when using long cables and high switching frequencies, high frequency common-mode voltages, which induce high shaft voltages leading to bearing currents and a very fast voltage rise in the PWM wave causing EMI problems including high leakage currents. This paper presents an exhaustive survey of output filter topologies to minimize the impact of PWM inverter waveforms on AC induction motors by using output filters. It is aimed at presenting a state of the art on the improved power quality of PWM inverter to researchers, designers, and application engineers dealing with three-phase output filters