Influence of geometry and wave shape on magnetic amorphous material

The magnetic performance of 0.03 mm thick Co-based and 0.026 mm thick Fe-based amorphous ribbon in toroidal and strip form was measured under sine and pulse width modulation (PWM) waveform conditions. The measured loss, at 100 Hz fundamental frequency and a peak flux density of 91% of the saturation of each material, was separated into classical eddy current, hysteresis and anomalous loss components and the effect of geometry and waveform on these loss components was analysed. The results in general show a dimensional and waveform dependence which is not so great as in electrical steels.