SIMPLE-MODELS FOR DYNAMIC HYSTERESIS WHICH ADD FREQUENCY-DEPENDENT LOSSES TO STATIC MODELS

The broadening of magnetic hysteresis with increasing frequency of exc itation may be represented in an electrical equivalent circuit by plac ing a resistor in parallel with an inductor whose core is the magnetic material represented by a static hysteresis model. This broadening ca n be controlled as an arbitrary function of frequency by changing the resistance with frequency. This, in turn, may be accomplished by using a parallel set of linear resistors, each placed in series with a band pass fitter, in place of a single resistor. This technique is illustra ted by a simulation of both fast pulse excitations and moderate freque ncy sinusoidal excitations for 3C81 ferrite material using an equivale nt circuit containing just three resistive parallel branches along wit h the static hysteresis model of Jiles and Atherton.