| 摘要 |
PURPOSE:To obtain a sensor which enables accurate measurement of torque by electrically measuring changes in the magnetic characteristic in a noncontact manner by winding an amorphous magnetic alloy thin body with larger magnetostriction constant securely on a rotating shaft after an induction magnetic anisotropy is imparted thereto beforehand. CONSTITUTION:A thin body with the thickness of less than 20mum of an amorphous magnetic alloy such as (Fe0.985Nb0.15)81Si6B13 represented by the formula (where, M is Ti, V, Co, Nb, rare earth metal or the like, (a) less than 0.5 when M is Ni or Co and less than 0.1 in other cases, x=0-20, y=5-30 and x+y+z= 100) undergoes a heat treatment with the application of a DC magnetic field at 45 deg. to the length thereof to be imparted an induction magnetic anisotropy. The thin body is wound on a rotating shaft 1 and fixed with an adhesive and undergoes a heat treatment for removal of internal stress to make a circular magnetic core 2. Thus, changes Ku' 6 in the uniaxis anisotropy Ku 5 is determined as generated in the magnetic core 2 due to a distortion stress sigma caused by a torque 3 applied on the shaft 1. |
