| 摘要 |
PURPOSE:To facilitate the manufacture of the torque sensor by making the following substance as a differential torque system sensor by using the titled magnetic thin band made of high and low magnetostriction layer having different properties of magnetic characteristic, or the magnetic layer of positive magnetic characteristic and that of negative one. CONSTITUTION:The titled magnetic thin bands 9a and 9b different from each other in spiral direction are fixed by adhesion on the outer peripheral surface of a torque transmission shaft 8. An excitation winding 10 excited to these magnetic thin bands 9a and 9b by means of an AC power source, detection windings 12a and 12b connected in reverse series, and a synchronization rectifying circuit 13 which obtains a DC voltage from the voltage induced in said windings 12a and 12b are provided. By this constitution, the impressed torque is made as the difference of permeabilities of the two magnetic thin bands 9a and 9b, which is detected by an AC bias magnetic field. Then, the influence by the material of the transmission shaft 8 and the rotational direction and rotational speed is eliminated, and accordingly the torque is detected with a high accuracy in a wide dynamic range. |
