The static hystereses of Somalloy 500 and OL steel have been determined using a new laboratory device. This novel equipment has an 8-figure shaped magnetic core, two dc coils, powered by a set of electrical currents, whose values are chosen, in order to obtain a null magnetic flux in the median yoke. To control the zero value of the magnetic flux it was used a special median core, with flux concentrators and an air-gap, in which a Hall sensor is placed. Using the specific values of the two coils’ currents, the hysteresis cycle and the normal magnetization curve are computed. In order to decrease the computation time, a magnetic circuit branch model is used, having the magnetic flux versus magnetomotive force φ(um) dependence on each branch obtained by solving a set of non-linear media magnetic field problems. B-H non-linearity is treated by polarization fixed point method (PFPM). In order to obtain high values of flux density in the tested sample, it is placed between two magnetic flux concentrators.

Keywords: Static hysteresis, Magnetic materials, New laboratory apparatus