The property of core loss of the non-oriented silicon steel sheets as a function of thickness, silicon contents and grain size were measured by SST(Single Sheet Tester). The specimens were excited by sinusoidal wave, AC(50Hz) with a single high order harmonic component and PWM waveforms. Si contents influence scarcely the core losses of the specimen with 0.35mm thickness independent of excitation waveforms when the grain size was large. But, in case of the core losses of the specimen with 0.50mm thickness, Si contents influence on under PWM waveforms excitation and under ACSH waveforms excitation. It is supposed that the effects of high order harmonic component originated in non-sinusoidal excitation largely appear in the core loss on condition that the specimen is thicker, Si contents is lower and grain size is larger and that is mainly caused by the eddy current loss.
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