Transfer Function Method for EMC High-Frequency Modeling of Electrical Machines

Any electrical machine can be exposed to electromagnetic interference, or even be the source of it. Researchers are increasingly taking EMC problems in electrical machines seriously, because of the consequences they can have in terms of operation, efficiency and service life. High-frequency modelling of the winding impedance of electrical machines is becoming increasingly important in this context, as it can be a practical asset for engineers in predicting the EMC behaviour of any machine. Several models have been developed for different electrical machines. In this paper a method based on the principle of transfer functions has been used to model several electric motors for the two propagation modes: differential and common modes. The results obtained show the effectiveness of the proposed model in predicting the impedance of the windings of any motor for frequencies up to 10MHz.