Influence of magnetostriction on hysteresis loss of electrical steel sheet

To reveal influence of magnetostriction on hysteresis loss of electrical steel sheet, hysteresis loss and magnetostriction of non-oriented electrical steel sheets (NOs) with various Si and Al content and grain size and grain oriented electrical steel sheet (GO) were measured under compressive or tensile stress. Here, Si and Al content and stress were focused on as the way to change magnetostriction. Stress direction and magnetizing direction were parallel to the rolling direction. Following three main results were obtained. The first is hysteresis loss of NO with same grain size which increased with magnetostriction independently of Si and Al content and stress. The second is hysteresis loss of NO was larger than that of GO under same magnetostriction. The third is hysteresis loss of NO at magnetostriction of zero was inversely proportional to grain size. Even if the grain size of NO increased to be similar size of GO without changing texture, the hysteresis loss of NO at magnetostriction of zero would be larger than that of GO because of the difference in texture. - Highlights: ► Hysteresis loss and magnetostriction of NO and GO were measured under stress. ► Hysteresis loss of NO was proportional to magnetostriction. ► Hysteresis loss of GO was proportional to magnetostriction. ► Hysteresis loss of NO was larger than that of GO under samemagnetostriction. ► Hysteresis loss was separated into 4 components.