Induction motors thermal behaviour and life expectancy under non-ideal supply conditions

This paper deals with thermal behaviour analysis of three-phase induction motors under nonideal supply conditions. The motors are of squirrel cage type and the nonideal conditions are associated to harmonics, unbalances, voltage sag and swell, etc. The studies are carried out using a comprehensive methodology which handles electrical, mechanical and thermal models in a simultaneous way. The approach is then implemented into a time domain program known as the SABER simulator. Computational studies are then performed to evaluate motor temperature rise and life reduction under nonideal conditions.