A measuring setup for testing the mechanical stress dependence of magnetic properties of electrical steels

Measurements of mechanical stress dependence of magnetic properties of electrical steels are significant from both theoretical and application points of view. The paper presents a novel measuring setup for testing the magnetoelastic properties of electrical transformer sheets made of grain-oriented and non-grain-oriented steel. The proposed method takes into consideration the angle between the easy electrical steel magnetization axis and the mechanical stress direction. Due to the innovative 3D self-adjustment mechanism of the yoke position, measurements may be taken for different magnetization strengths and angles. The paper also presents detailed uncertainty analyses and examples of results of magnetoelastic measurements for grain-oriented electrical steel M120-27s. The presented results validate the method and confirm its usability for further detailed studies of mechanical stress dependence of magnetic properties of electrical steels.