Transient voltage distribution in inverter fed motor windings: Experimental study and modeling

The different voltage waveforms along with their distribution in the inverter fed motor windings are presented with the help of a specially equipped machine. As a matter of fact, even though a lot has been said on the possible premature failure of such machines, little is known on the internal voltages appearing in the windings or for that matter from a theoretical point of view, the reasons for such voltage distributions. The aim of this paper is to demonstrate that for more accurate picture emerges by taking into account the energy losses in the iron frame. The use of a new mathematical tool called "diffusive representation" permits to obtain a simple model for time-domain simulations. Such an approach gives very good results as demonstrated in the paper.