Prevents the moisture entry

Transfers the heat to atmosphere

Allows to release internal pressure

Allows expansion of oil level due to load variation

Copper loss

Windage loss

Hysteresis loss

Eddy current loss

0.072

0.083

0.0871

0.0909

Reduce copper loss

Reduce hysteresis loss

Reduce mechanical loss

Reduce eddy current loss

Copper loss > Iron loss

Copper loss < Iron loss

Copper loss = Iron loss

Copper loss =Eddy current loss