Abstract
A method for evaluating the equivalent permeability of soft magnetic composites is presented. Firstly, a new microstructural characterization model of soft magnetic composites is proposed, which introduces the concepts of pores and gaps. The effect of these two structures on the magnetic properties of composites is analyzed, and an analytical model is derived from the microstructural parameters. Secondly, the compaction process is numerically simulated by discrete element method and powder particle 3D reconstruction technique. The microstructure models of soft magnetic composites under different compaction conditions are established. Finally, the magnetic field characteristics of the microstructure model are analyzed by finite element method, and the equivalent permeability is accurately evaluated. The correctness and feasibility of the simulation method proposed in this paper is verified by comparing with the measured results.
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