Innovative Soft Magnetic Composite Materials: Evaluation of magnetic and mechanical properties

Emir Pošković,Fausto Franchini,Róbert Bidulský,Luca Ferraris,Marco Actis Grande

doi:10.1515/eng-2018-0047

Emir Pošković, Fausto Franchini + Show 3 more

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https://doi.org/10.1515/eng-2018-0047

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Abstract

AbstractElectrical machines cover a very wide range of applications in many industrials sectors and the research to improve the performance of those applications is recently leading to the development of new solutions. Those devices are generally equipped with magnetic circuits made of laminated ferromagnetic steel, but in the last decade, new magnetic materials have been developed to realise magnetic circuits: Soft Magnetic Composites (SMC). The Authors have investigated SMCs with organic layer obtained through the adoption of phenolic and epoxy resins; in previous research activities several mixture compositions have been produced and analysed with different percentages of binder and compacting pressures. Promising results regarding magnetic and mechanical performances have been obtained using a very low binder content. The paper aims to investigate the lower limit of the binder to be used, still keeping good mechanical properties. Appropriate magnetic tests have been performed on toroidal specimens: good magnetic characteristics have been obtained, maintaining on the other side proper mechanical strength.

Highlights

The growing demand for higher efficiencies in several industrial sectors focuses the research to find new solutions in many application fields
Those devices are generally equipped with magnetic circuits made of laminated ferromagnetic steel, but in the last decade, new magnetic materials have been developed to realise magnetic circuits: Soft Magnetic Composites (SMC)
It is evident that the variation of binder does not affect the magnetic characteristic (Figure 2)

Summary

Introduction

The growing demand for higher efficiencies in several industrial sectors focuses the research to find new solutions in many application fields. The present work is focused on SMC materials: pure iron grains are coated and insulated with a layer, which can be of organic or inorganic nature. The advantages of such materials with respect to traditional laminated steel lie in different features: the capability to lead the magnetic flux in all directions, the reduction of the volumes, the possibility to produce components in new complex geometries, and the lowering of iron losses, mainly with the reduction of eddy currents, at medium and high frequency. New typologies of electrical motors may be designed and produced with the adoption of SMC materials [12]: for instance Axial Flux Motors (AFM) [14,15,16], Transverse flux motors (TFM) [17, 18] and Claw pole motors [19]

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