Magnetic Shielding Materials for Electric Vehicles

Abstract

The magnetic field shielding ability of different categories of soft magnetic materials in electric vehicles is discussed in this paper. These materials are magnetically soft steel sheets of a thickness in the order of 1 mm including the structural low carbon steel sheets, Ni3Fe permalloy coatings of a typical thickness in the order of 1 m, as well as Fe-B amorphous ribbons of 25 m thickness. Their geometry determines the different magnetic characterization in terms of determining the permeability or magnetization loops. The first one is related to the single sheet testing principle, suitable for steel sheets. The second is a Hall effect based measurement, suitable for thin films, while the third method is related to the magnetostrictive delay line principle. In parallel to the magnetic characterization, structural characterization is also realized, by means of X-ray diffraction, transmission electron microscopy and thermal differential analysis, in order to correlate magnetic properties with structure for property tailoring reasons. This is the methodology for testing the affordable applicability of such types of magnetic materials in magnetic field shielding in electric vehicles.