“…Fig. 5 shows the induction dependence of the noise of a trial transformer made by 6.5wt% Si-Fe alloy sheets and the conventional silicon steels [26] 1271. Because the 6.5wt% Si-Fe alloy sheets have low magnetostriction (0.6x10-0, the noise of the transformer made of the 6.5wt% Si-Fe is lower than that made of conventional silicon stells.…”