Finite element analysis and Preisach hysteresis model of a toroid compared to measurements

Two methods predicting magnetic hysteresis effects are compared to measurements on a closed and open toroid. The soft-magnetic laminated toroids are simulated with a 3-dimensional finite element method (3D-FEM) and the classical Preisach model (CPM). On the closed toroid a direct comparison between both models has been made and the CPM shows better agreement with the measurements, especially at low excitation field strengths. In the open toroid with a 1.0 millimeter airgap, it is shown that the prediction and measurement of the magnetic flux density in the airgap are strongly influenced by leakage and fringing fluxes. Nevertheless, both predictive methods show reasonable agreement with the preformed measurements.