Determination of Equivalent Permeability of Soft Magnetic Composites Considering Manufacturing Process

A novel evaluation method of the equivalent permeability of soft magnetic composites (SMC) is proposed, referring to the pressing mechanism. Firstly, the microstructure of the SMC is analyzed, and the region between ferromagnetic particles is divided into gaps and pores. An analytical calculation method for two permeability boundaries is derived when the non-ferromagnetic region is completely occupied by gaps or pores. Finally, the accurate homogenized permeability can be determined in terms of composites density and the ratio of gaps and pores which is affected by the manufacturing process parameters during preparation. The proposed method can tentatively predict the magnetic properties of composites, thereby helping select appropriate processing parameters.