Influence of Vitroperm Content on the Energy Losses in Composite Materials Based on the Mixture of Two Ferromagnets

Abstract

Soft magnetic composites oer several advantages such as 3D isotropic magnetic properties and relatively small energy losses, nding use in electrical devices like electromotors, transformers or sensors. The aim of this work was to investigate the dc and ac magnetic properties of composites based on the mixture of two dierent ferromagnets: iron based material Somaloy R 700 and Vitroperm R 500 alloy. The analysis of total losses into dc losses, classical losses and excess losses showed that the classical and excess losses were negligibly small. The specic resistivity was increasing with the increasing fraction of Vitroperm (VPM). The coercivity exhibited maximum at 20% of VPM.

Investigation of Magnetization Processes from the Energy Losses in Soft Magnetic Composite Materials

“…Particle size distribution measurement showed peaks at 45, 75, 100 and 160 µm (classes F45, F75, F100, and F160) [6,11]. Second type samples were prepared by mixing Somaloy®(S) powder (Höganäs AB, Sweden) with 5, 10, and 30 wt% of Vitroperm®(VPM) flaky powder (Vacuumschmelze, GmbH & Co. KG, Germany) [5,13], samples labelled S-VPM (S95-5VPM, S90-10VPM, S70-30VPM), then compacted at 800 MPa and cured at 530…”

“…The excess losses W exc are one of the components of the basic classification of the total energy losses W t [2,[7][8][9][10] in ferromagnetic material, besides the DC losses W DC and the classical eddy current losses W c (where * corresponding author; e-mail: zuzana.bircakova@outlook.com in SMCs [1][2][3][4][5] furthermore the intra-particle and interparticle flowing of eddy currents is considered). W exc result predominantly from the eddy currents induced when the domain walls are moving [2,[7][8][9] and depend inversely on the effective number of movable domain walls n [2,8,9], W exc ≈ 1/n.…”

“…Soft magnetic composite (SMCs) materials represent a specific class of ferromagnetic materials, composed of small ferromagnetic particles insulated from each other, resulting in some unique properties as the magnetic isotropy, and relatively low total energy losses at medium to higher frequencies, which make SMCs well suited for various AC and DC electromagnetic applications [1][2][3][4][5]. The structure of SMCs containing non-ferromagnetic components (insulation and pores) give rise to the inner demagnetizing fields [6,7], which cause that magnetization process is performed more or less independently in each ferromagnetic particle of SMC and hence certain magnetic properties dependences are different from the majority of cast ferromagnets [1][2][3][4][5][6]8].…”

“…The structure of SMCs containing non-ferromagnetic components (insulation and pores) give rise to the inner demagnetizing fields [6,7], which cause that magnetization process is performed more or less independently in each ferromagnetic particle of SMC and hence certain magnetic properties dependences are different from the majority of cast ferromagnets [1][2][3][4][5][6]8].…”

Influence of Vitrovac Content on Magnetic Properties in Composite Materials Based on the Mixture of Two Ferromagnets

“…Recently, a group of soft magnetic composites was extended by introduction of new materials which offer the possibility of production of components with significantly higher saturation induction, permeability, and lower losses [1][2][3].…”