| 摘要 |
PURPOSE:To obtain a highly accurate sensor without change in the elastic modulus regardless of repeated use by winding a thin band of crystalline magnetic metal with the absolute value of the magnetostriction constant exceeding a specified value securely on a rotating shaft to measure a torque working on the rotating shaft utilizing changes in the magnetic characteristic of the thin band. CONSTITUTION:A simple Ni or an alloy of FeaNi100-a(a<=10 or 45<=a<=60), Ni100-bCob (b<=20), Co100-cFec (40<=c<=60), Fe100-dAld (10<=d<=15) or the like as crystalline magnetic metal with the absolute value of the magnetostriction constant exceeding 20X10<-6> is used to made a thin band with the thickness of less than 50mum which formed into a circular magnetic core 2 to match the diameter of a rotating shaft 1 and undergoes a heat treatment to remove internal stress. Then, the circular magnetic core 2 is fitted into the shaft 1 and fixed with an adhesive while the shaft 1 is twisted. Then, the shaft 1 is undone whereby the circular magnetic core 2 is imparted an induced magnetic anisotropy Ku. In this manner, the value of the magnetic anisotropy Ku' is detected when a torque 3 is applied to the shaft 1 thereby creating a torque sensor without change in the detection characteristic regardless of repeated detection of torque. |
