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Early failures due to stator insulation breakdown are still frequently experienced in industrial applications where low-voltage induction motors are fed by adjustable speed drives. Such events are caused by the quick erosion of organic insulating materials used in Type I random wire wound windings when the inception of partial discharges (PDs) is triggered by the severe electrical stress produced...
Nowadays electrical motors used in industry applications are usually coupled with inverter drives so that the stator motor windings are subjected to severe voltage waveforms such as PWM. When electrical motors having stator windings realized by means of type I random wire wound are subjected to these kinds of voltage waveforms, reliability problems due to degradation phenomena increase. In this research...
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