Magnetostriction measurements on electrical steel and the effect of coating

Magnetostriction strain measurements on the samples of grain oriented and non-oriented electrical steels by using the heterodyne laser interferometer technique are presented. The measurements are performed on the samples with and without coating. The latter data show similar behaviour as of those obtained by using the strain gauge technique. Magnetostriction strains of the coated samples are smaller in amplitude compared to the non-coated samples. This difference is around 15 times lower for the grain oriented and 1.2 lower for the non-oriented samples