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# Laboratory Set-Up to Evaluate the B-H Relationship in Soft Magnetic Materials

In this paper is presented a novel laboratory equipment, which measures the static characteristic B-H of the soft magnetic alloys. The proposed device is very useful, to study the B-H relationship of new magnetic materials, because mechanical machining is not necessary, in order to obtain a special geometrical shape, and the measurement could be done also “in situ” conditions. The magnetic circuit of the device has an “8” figure shape and is made from a magnetic material with negligible hysteresis. The sample that has to be characterized is made from Somaloy 500, which is placed on the base horizontal yoke. The experimental device has two DC coils, in which the currents I1 and I2 are set so that the magnetic flux through the median yoke is canceled. The control of the null magnetic flux value is done by two methods. In the first method, it is used an “O” shaped piece, made from mumetall, which has a coil supplied by AC voltage. The other method uses a median yoke with an air gap, where is placed a Hall sensor. Starting from a set of currents’ pairs (I1, I2) a numerical program is used to solve the stationary magnetic field inverse problem, to determine the piecewise linear normal magnetization curve of the Somaloy sample. The inverse magnetic field problem is computed, using the Green function method for the linear iterations and the polarization fixed point method for the nonlinearity.Author(s):

Gheorghe PALTANEA

University POLITEHNICA of Bucharest

Romania

Veronica MANESCU (PALTANEA)

University POLITEHNICA of Bucharest

Romania

Paul Cristian ANDREI

University POLITEHNICA of Bucharest

Romania

Catalin GRUMEZA

University POLITEHNICA of Bucharest

Romania

Stelian MARINESCU

University POLITEHNICA of Bucharest

Romania