Magnetostriction Model of Electrical Steel Sheet Considering Temperature Gradient

In the magnetization process of certain high- temperature operational motors, it is common to observe non- uniform heat distribution, resulting in the formation of a temperature gradient. The existence of different temperature gradients will change the magnetostrictive properties of the electrical steel sheet (ESS), which will affect the vibration characteristics of the motor core. In this paper, a set of measuring platform for measuring magnetostrictive properties of ESS under the condition of temperature gradient is built. The dynamic magnetostrictive properties of ESS under different temperature gradients are measured and analyzed, and the anisotropic magnetostriction in different magnetization directions is explained. A model for evaluating the influence of different temperature gradients on magnetostriction of ESS is proposed to estimate the dynamic magnetostriction curve. Finally, the proposed model is verified by comparing the measured magnetostriction and computed one.