Affiliations: [a] LCFC, ENSAM Campus de Metz, 57078 Metz Cedex 3, France | [b] L2EP, Université des Sciences et des Technologies de Lille, 59655 Villeneuve d’Ascq, France | [c] Valeo Powertrain Systems, 94046 Créteil Cedex, France
Correspondence:
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Coresponding author: Marc Borsenberger, LCFC, ENSAM Campus de Metz, 4 Rue Augustin Fresnel, 57078 Metz Cedex 3, France. Tel.: +33 3 87 37 54 30; Fax: +33 3 87 37 54 70; E-mail: marc.borsenberger@ensam.eu.
Abstract: Magnetic parts are usually composed of a stack of electrical steel laminations to reduce the eddy current losses. However, for cost reasons or for specific applications the magnetic core can be made from massive steel and thus manufactured with adapted processes such as forging. Such process may lead to inhomogeneous and degraded magnetic properties. Therefore, this study proposes a specific device for characterizing magnetic properties of samples which are to be representative of a massive part. The measure is based on the Faraday’s equation to determine the magnetic flux density and the Hall effect to estimate the magnetic field inside the sample. Practically this is realized with classical components such as Hall probes, a secondary winding and an electromagnet device. However their combination is unique to perform magnetic characterization on massive samples, which are less affected by the sampling technique and may have anisotropic properties. The device is dimensioned thanks to FE-Simulation and validated according repeatability, sensitivity and trueness analysis. Eventually the characterization is performed on samples with different material parameters showing the effect of the grain size on the specific losses. The expected effect of the grain flow on magnetic properties is however not proven yet.
Keywords: FE-Simulation, magnetic characterization, massive sampling, material properties
