Experimental analysis of magnetic properties of electrical steel sheets under temperature and pressure coupling environment

Motor made of electrical steel sheet is sometimes used in extreme environments, for example, submersible motors are operated at temperatures and pressures coupling environment. However, most related reports only consider the effect of single environmental factor (temperature or stress) on the magnetic properties of electrical steel sheets. Therefore, in order to accurately design a motor that can operate at temperatures and pressures coupling environment, the magnetic properties of electrical steel sheets used in the motor should be clarified firstly. In the paper, two kinds of specimens (ring specimen and rolled specimen) are used to measure the magnetic properties under temperature and pressure coupling environment. It not only reveals the influence of temperature and pressure coupling environment on the magnetic properties, but also analyzes the difference between the measurement results obtained by two kinds of measurement samples. The measurement results show that the effect of pressure on magnetic properties decreases with increasing temperature under the conditions of temperature and pressure coupling. According to the domain theory, a reasonable explanation for the influence of temperature and pressure coupling environment on electrical steel sheet is given. Meanwhile, combining the shape and size of the two measurement samples, the possible causes of the differences in the measurement results of the two measurement samples were analyzed in detail.