Greetings to all,
A high voltage motor was sent for rewinding, and when it came back, its temperature increased by around 20 deg. It is cooled by an air-to-air heat exchanger and motor cooling fan (MCF) driven by motor shaft.
Can someone help in identifying the possible causes of temperature increase?
I assume that the heat exchanger is most probably causing the temperature rise, but how to check that?
Is it possible that the winding insulation affect motor temperature? I mean for two motors exactly the same, if we used different winding for each one, i.e. class F for one and class H for the other, would that affect the motor temperature?
Thank You in Advance