Computation of the Preisach distribution function based on a measured Everett map

Modeling the hysteresis behavior of soft magnetic materials based on Preisa ch theory, requires a Preisach distribution function characterising the mat erial. Although it is possible to obtain all the data for a classical Preis ach model from experimental first-order curves, obtaining the Preisach dist ribution function by differentiating this data twice leads to large errors and even to negative values in the distribution function. This work reports on how to avoid these errors in the Preisach function when it is computed starting from measured data. Measured B H-loops are arranged into an Everet t function, which is then corrected in order to serve as a basis for the Pr eisach distribution function, The computation method is tried out on a nono riented, a grain oriented and an iron-powder material.