Magnetic stresses analysis of a two speed, large power, synchronous motor in abnormal working conditions

This paper deals with the electromagnetic calculations of the stator magnetic stresses in the two-speed, large power, silent pole, synchronous motor. Prediction of such stresses is very important in understanding vibration phenomena of these special electrical machines. Because of non-symmetrical armature (stator) and field (rotor) winding the only one way of investigation is Finite Element Modelling. The simulations results for nominal load, for two different rotational rotor speeds: n=500 rpm (p=6) and n=600 rpm (p=5) are presented.