IV. DISCUSSION
The increase of eddy current loss is caused by the
machining process of the test machine. The core of the
experimental motor is made by machining from bulk
SMC material. Electric discharge machining and
grinding is used to form the shape of the core. Press
molding is used only for manufacturing bulk SMC.
Molding is not used for manufacturing of the test motor.
The machining generates heat even the work is cooled
during machining. The insulation layer of the powder
surface is degraded and destroyed by the heat.