Application of Preisach Model to Grain (Oriented Steels : Comparison of Different Characterizations for the Preisach Function p(a, p)

To take into account scalar hysteresis in magnetic calculations, accurate models are required to correctly describe soft magnetic material behavior. The Preisach model makes it possible to do so if its distribution function p(a, p) is well determined. This paper presents a comparison of four methods of characterization of the function that uses different peak magnetization level loops of grain oriented sheets. The choice of a lorentzian function with a term of interaction field shows interesting results. In order to design electrical engineering devices, CAD tools are used more and more. To improve the accuracy of these tools, a special effort is made to better model the magnetic behavior of electrical steels that mainly compose electrical devices. Several models are proposed in the literature to take into account scalar hysteresis in soft magnetic materials. These models make it possible to describe the law that links the field H and the induction B and as a consequence, losses due to hysteresis can be determined. While many authors have well characterized hysteresis in nonoriented sheets, no one has really characterized and modeled the behavior of grain oriented sheets, probably because of experimental difficulties. The aim of this paper is to contribute to the description of the scalar hysteresis presented by grain oriented sheets. To do so, a Preisach type model is chosen and several ways of characterizing the Preisach function p(a, j3) are used, compared and discussed. The final goal is to propose the method that requires the fewest experimental curves and that presents the best accuracy, in order to be later on integrated in dynamic computations .