Conducted EMI in power converters feeding AC motors: experimental investigation and modelling

The purpose of this paper is the study of PWM inverter-fed induction motor behaviour in terms of high frequency electromagnetic conducted emissions. The development of a suitable model of the complete system, a power drive system (PDS), for prediction of high frequency conducted electromagnetic interference (EMI) and leakage currents, is also presented. The proposed model accounts for the presence of a parasitic components system, whose contribution to propagation of conducted disturbance is relevant. Experimental results of high frequency electromagnetic conducted emission measurements on a PDS are reported. The comparison of the experimental results with the ones obtained by simulation of the complete system, according to the proposed model, shows a good agreement.