Magnetic properties and loss separation in iron powder soft magnetic composite materials

Abstract

New developments in powder metallurgical composites make soft magnetic composite ͑SMC͒ material interesting for application in electrical machines, when combined with new machine design rules and new production techniques. In order to establish these design rules, one must pay attention to electromagnetic loss characteristics of SMC material. In this work, five different series of iron based SMCs are produced and studied: ͑1͒ Pure iron powder with resin; ͑2͒ sintered iron based powders; ͑3͒ pure iron powder with additions of Zn-st and carbon; ͑4͒ iron based powder alloys ͑Fe,Nb,Si͒; ͑5͒ commercially available iron powder ''Somaloy.'' The specimens were shaped as rectangular rods and characterized on a miniature single sheet tester which was calibrated to Epstein. The measured energy losses are analyzed following the loss separation theory of Bertotti, in which the total energy loss is decomposed into hysteresis loss, classical Foucault loss, and an excess loss component.

Preparation of soft magnetic alloys Fe100−x−ySixPy (0<x<9, 0<y<0.6 wt%), using solid phase diffusion-sintering method

“…Therefore, the rod samples were characterised directly on a small size single sheet tester (SST), which was calibrated to the standard Epstein frame [9]. The dimensions and detailed description of the SST used by us are given in a previous paper [10]. The calibration of the SST was done on a non-oriented electrical steel sheet.…”

Dynamic losses in FeSi filled polymer bonded soft magnetic composites

“…A disadvantage of the composite materials is the lower permeability in contrast to laminated sheets which implies that they cannot be used as a direct replacement without abatement in performance [2].…”

Reversible and irreversible DC magnetization processes in the frame of magnetic, thermal and electrical properties of Fe-based composite materials

“…It was observed that q R decreases with the increasing magnetic particle size: for compared to similar composites investigated e.g. in [29][30][31], revealing good insulation of particles.…”