Induction motor parts by parts

The main testing parameters are noted down below. 1 to 3 no's are most Frequent test. While others are usually tested by steel supplier or R&D purpose by the motor experts. Hysteresis loss and eddy current loss in separate value. Permeability of the punched sheet. B-H curve generation. Maximum polarization Effective polarization Maximum field strength Effective field strength Remanence Coercive field strength Specific apparent power Hysteresis display Form factor J(H) values for graphic display Among them hysteresis & eddy current loss is namely core loss and it checked as regular checking parameter before giving to stator line feeding. Usually core loss value is checked in each roll of stator lamination from the Press punched lamination. There are 3/4 total renowned tester supplier worldwide. 

There are special grade of silicon steel used in hermetic compressor motor. As because the motor performance should be high enough to meet the requirement of compressor COP, we electric motor designer always prefer to use steel with low watt/kg (core loss) value. But, certainly we should keep in mind about the exponential price rise along with the core loss value. The range of core loss value can be allowed in the range of 1.85 to 2.5 watt/kg at 1 tesla. Si Steel roll for punching in High speed press