EMI modeling of an inverter-motor association

The conception of a power electronic converter is made without a real EMI prediction method. The classical sizing methods based on experiments are effective but not optimized. They involve the increase in the designing duration. To reduce these stages, a mathematical model estimating the conducted EMI generated by a three-phase inverter is pointed out in this paper. This model, based on analytical disturbance-sources and propagation paths, including EMI filter and the induction-motor, permits the prediction of common and differential modes in all the structure. Passive components and especially the cable and AC motor elements have been modelled.