Affiliations: [a] Department of Electrical Engineering, University Politehnica of Bucharest, Bucharest, Romania
Correspondence:
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Corresponding author: Gheorghe Paltanea, Department of Electrical Engineering, University Politehnica of Bucharest, 313 Splaiul Independentei, Bucharest, 060042, Romania. E-mail: paltanea03@yahoo.com, gheorghe.paltanea@upb.ro
Abstract: The static B-H relationship is a very important parameter, used in the characterization of magnetic materials. In the paper is presented a novel laboratory equipment that has an “8” figure shaped magnetic circuit, which is made from a negligible hysteresis soft alloy. The experimental set-up consists of two DC coils, in which the currents i1 and i2 are set, to obtain a null value of the magnetic flux in the median yoke that has an “O” shaped figure, with two AC coils. A stationary magnetic field inverse problem is solved, starting with a couple of DC currents (i1, i2) and a piecewise linear normal magnetization curve is computed. The nonlinearity of B-H relationship is treated by polarization fixed-point iterative method, while for each iteration the Green function is engaged. The static magnetization curve is compared, with the B-H relationship measured, using a high precision metrological device, on a toroidal sample made from the same material.
Keywords: B-H relationship, green function method, inverse magnetic field problem, polarization method, soft magnetic composites
