Magnetic properties and hysteresis loops modeling of iron powder cores influenced by high compacting pressure

This paper presents the results of a study on the impact of variable compaction pressures on the magnetic properties of the developed compacted powder cores with the aim to determine the optimal compacting pressure for minimizing the power loss and improves frequency stability of permeability. We study the change in the shape of hysteresis loops and their effect on the values of hysteresis model parameters of the phenomenological GRUCAD model. The ball milling process and the compaction process generate mechanical stresses. We assume that there are two effects of the compaction pressure: a positive effect of reducing porosity and a negative effect of increasing mechanical stress inside the powder particles. It is shown that within the specified pressure range, there is a balance between the two determining factors, and the optimal pressure for power loss is 1.4 GPa and for frequency stability of the permeability is 1.5 GPa.