Effect of Si Content on Magnetostrictive Properties of Electrical Steel Sheet Considering Tensile Stress

Non-oriented electrical steels used as motor cores are subjected to mechanical stress, which has a significant impact on their magnetostrictive properties. Moreover, electrical steels with different Si contents will also show different magnetostrictive properties. Therefore, in this article, the magnetostrictive properties of four kinds of non-oriented electrical steel sheets with different Si contents were tested under tensile stress. Experiments show that the magnetostrictive strain of electrical steel decreases with increasing Si content. Meanwhile, under the influence of tensile stress, the magnetostrictive effect of electrical steel begins to decrease, and the trend of this change shows an increasing and then decreasing trend with the increase of Si content. It is noteworthy that the magnetostrictive strain of 6.5% Si is minimally affected by both the tensile stress and the magnetic flux density. Finally, this article explains the variation rule of magnetostrictive effect of electrical steel with different Si contents under the influence of tensile stress in terms of the micro-magnetic mechanism of the magnetostrictive effect and micro-grain structure of electrical steel.