A METHOD FOR THE DETERMINATION OF THE PARAMETERS OF THE HYSTERESIS MODEL OF MAGNETIC-MATERIALS

Many methods have been proposed for the determination of the hysteresi s loops of magnetic materials, and many mathematical approaches have b een proposed to find a good model for the hysteresis phenomenon. Howev er, very few attempts have been made to determine the parameters of th e hysteresis model experimentally. This paper will show how, starting from a digital method for the experimental determination of the hyster esis loop under different maximum induction values, the parameters of a hysteresis model can be automatically estimated with good accuracy. Due to its good behavior in terms of accuracy and to the comparative e ase in determining its parameters, the Preisach model for rate-indepen dent hysteresis phenomena was chosen. Experimental determination of th e model and consequent hysteresis loop computation were carried out. A n accuracy below 1% was attained over the peak induction range from 0. 49 T to 1.68 T and the frequency range from 50 Hz to 100 Hz.