The particle properties of magnetic powder core materials make the analysis of their eddy current hysteresis and loss characteristics extremely difficult. Therefore

in this paper

considering the feature that the magnetic powder core is made of metal spherical particles

the eddy current loss is divided into the eddy current loss within the particles and the eddy current loss between the particles. For the internal eddy currents of particles

the expression of the internal eddy current field of spherical particles is derived based on Maxwell's equations. For the eddy currents between particles

the method of equispaced segmentation is adopted

and the influence of the skin effect is taken into account. The distribution of the eddy current field on the cross-section of each magnetic ring segment is solved successively. The eddy current path conduction coefficient is defined to obtain the expression of the eddy current field between particles. Furthermore

based on the consistency of field separation and loss separation techniques

a high-frequency dynamic hysteresis model in the form of field separation is established

thereby achieving the prediction of core loss of granular magnetic powder core materials under high-frequency excitation. Finally

by building a comprehensive magnetic property measurement platform and coMParing the experimental measured values with the predicted values of the model

the accuracy and universality of the model prediction in this paper are verified.