Influence of the Resin Content on the Dynamic Energy Losses in Iron–Phenolphormaldehyde Resin Composites

Dependence of demagnetizing fields in Fe-based composite materials on magnetic particle size and the resin content

“…These fields depend not only on id μ , but also on the shapes of particles and on the permeability of effective surrounding medium (according to the well-known BruggemanLandauer's effective medium theory) [9][10][11]14,19]. For a magnetic body of ellipsoidal shape with a shape factor A ↔ (A α , x y z , , α = are main diagonal components of the tensor) immersed in a homogeneous medium of permeability μ, the internal magnetic field H int → in sample is given by the demagnetization factor (tensor) N d ↔…”

“…for three-dimensional isotropic ferromagnetic behavior or eddy current loss reduction, but it also gives rise to the demagnetizing fields produced by the ferromagnetic particle surfaces of SMC. In this case these fields depend on the amount of insulation and on the shapes of particles, their clustering and distribution [3,9,10], thus lowering the permeability of SMC and resulting in locational fluctuations of magnetic field within the composite [11].…”

The effect of volume concentration on the properties of easy-plane FeSiAl composites working in high frequency band

“…The out-of-plane demagnetization coefficients with values of 0.97 ∼ 0.99 provides the magnetic particles with a strong out-of-plane demagnetization field, which makes it difficult for magnetic particles to be magnetized in the out-of-plane direction and exhibit easyplane anisotropy [18,21]. Moreover, the small thickness can suppress eddy current flowing at the cross-section of the particles [16]. Figures 2(c), (d) display the cross-section of the toroidal core.…”

“…However, in SMCs with excess volume concentration, the contacts between particles reduce the effect of the insulating layers in SMCs, resulting in a dramatic increase in the eddy current effect. Furthermore, an excess volume concentration also leads to a lower frequency of domain wall resonance and natural resonance [8,[14][15][16][17][18]. Thus, a proper volume concentration is very important for maintaining the comprehensive magnetic properties of SMCs [15,18].…”

Irreversible permeability and DC losses relationship for selected soft magnetic materials

“…The Fe-phenolphormaldehyde resin composite samples differed in the content of insulation (resin) and the particle size distribution [8,18,24,25]. Pure Fe powder ASC 100.29 (Höganäs AB Sweden [23]) was sieved to obtain particle size distributions with peaks at 45 µm and 100 µm (granulometric classes labelled SMC45 and SMC100).…”