Frequency and Waveform Effects on the Turn Insulation Life Time

Published reports on the reliability of the drive fed induction machines indicate that the most significant defects in the induction motors comprise of weakness and deterioration in the insulation systems. Therefore researches have been dedicating more focus on the improvement of the insulation performance of the drive fed induction motors in the last five past decades. New generation of high- frequency switching power electronic devices, lead to a major challenge in utilizing inverters in both of the starting the electrical motors and controlling of them. The drives output consists of high frequency and high amplitude impulses with a short rise time and a different pulse widths. Therefore, assessment of impulse shape effects with different frequency on the stator winding could be…