Magnetostriction Model of Electrical Steel Sheets Considering Temperature Gradient

In order to accurately evaluate the deformation and noise caused by magnetostriction in the motor design stage, it is very important to accurately estimate the magnetostriction effect of electrical steel sheets (ESS). However, the magnetostrictive characteristics of the ESS are more sensitive to stress, and the uneven heat generated by the electrical equipment in the work will produce internal stress on the material, thus affecting the rotating magnetostrictive effect. Therefore, a test platform for magnetostrictive characteristics considering temperature gradient was built. The rationality of temperature gradient loading on the test platform was verified by simulation, and the magnetostrictive characteristics of non-oriented ESS under different temperature gradients were studied through the test platform. A magnetostrictive model is proposed, which takes into account the influence of temperature gradient on the magnetostrictive strain and the temperature gradient dependence of the principal strain characteristic of magnetostriction with the change of magnetic flux density. The results show that the temperature gradient will affect the magnetostrictive stability of the ESS and will have a certain effect on the magnetostrictive effect of the ESS, in which the effect is not obvious at low magnetic density but will have a greater effect at high magnetic density.