Experimental analysis of magnetic anisotropy in silicon iron steels using the single strip tester

The standard magnetic measurements, for grain oriented (GO) and non-oriented (NO) electrical steels (FeSi), are made using the Epstein frame or the single strip tester. The magnetic characterization is limited to the rolling direction cut samples for the FeSi GO materials. For the NO ones, the standard measurements give an average of the magnetic behavior in the rolling and the transverse directions. In this article is analyzed the magnetic anisotropy of FeSi NO and FeSi GO strips, with the surface area of 300 × 30 mm². The measurements were performed with an unidirectional single strip tester on FeSi strips cut at 0°, 15°, 30°, 45°, 60°, 75°, 90° with the rolling direction. It was determined the hard and the easy axis of the samples and the influence of the anisotropy on the energy losses and relative magnetic permeability. The loss behavior of these alloys was studied as a function of frequency in the range of 5 Hz to 200 Hz at a given magnetic polarization (J_p) of 1 T.