Induction Motor Rotor Losses Analysis Methods Using Finite Element

In this paper, an analysis procedure for the induction motor rotor losses evaluation is presented. The technique uses only magneto-static and linear time-harmonic simulations, avoiding the time-domain approach. The rotor losses, analyzed in this paper, are due to stator slot harmonics. This kind of losses take place in both the rotor iron and, as Joule losses, in the cage. The iron losses are due to high frequency flux pulsation, thus they can be serious and not negligible, specially during high speed and frequency operation. A fast analysis technique is implemented to evaluate the rotor losses, due to the stator space harmonics,. avoiding the long time-domain approach. The analysis is done carefully taking into consideration the saturation effect and the different rotor cage reaction, in presence or not of the rotor skewing, is considered too.