IDENTIFICATION OF FREQUENCY EFFECT ON MAGNETIC HYSTERESIS AND MODELING WITH AN INTERNAL VARIABLES MODEL

In this paper, the first magnetisation response experimentally observe d on 0.5 mm thick sheets made of a non-oriented silicon-iron alloy is given for different magnetic loading frequencies from 0.05 to 500 Hz. An internal variable magnetic hysteresis model is identified from the quasi-static response (from 0.05 to about 5 Hz). This model is used fo r finite element analyses performed to predict the electro-magnetic re sponse of the material at higher frequencies. The comparison between t he results of these structural analyses and the experimental results p roves that in this case the macroscopic eddy currents are sufficient t o explain the total Frequency effect on the magnetic hysteresis measur ements.