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General properties of power losses in soft ferromagnetic materials

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1 Author(s)
G. Bertotti ; Istituto Elettrotecnico Nazionale Galileo Ferraris, Torino, Italy

Measurements are reported of the loss per cycle (sinusoidal flux waveform) versus magnetizing frequency fm(0⩽fm⩽100 or 400 Hz) and peak magnetization Imax, performed on 3% SiFe alloys (both grain-oriented and nonoriented), Armco iron, NiFe alloys, and amorphous ribbons. Using a novel theoretical framework, the microscopic origin of the observed dynamic losses is discussed, and a physical interpretation is given of the general fact that the loss per cycle is always a nonlinear function of fm. A theoretical procedure is discussed by which it is possible, for a generic material, given a single loss curve at a certain value of I max, to predict the dependence of dynamic losses on both Imax and fm, with an approximation within ±10% in all the investigated cases. The behaviour of grain-oriented SiFe, which presents some specific complexities, is discussed in particular detail

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IEEE Transactions on Magnetics  (Volume:24 ,  Issue: 1 )