TORQUE SENSOR OF NONCONTACT TYPE

摘要

In a torque sensor of a noncontact type for sensing a torque applied to a shaft, a magnetic ribbon is bonded to a circumferential portion of the peripheral surface of the shaft, and a core member made of a magnetic material is arranged above the shaft surface so that its end faces are faced to the magnetic ribbon. A exciting coil and a detecting coil wound around the core so that a magnetic flux produced by the exciting coil and delivered to the detecting coil is detected by the detecting coil. The magnetic ribbon has a length LO equal to or smaller than one half of the circumferential length Ls of the shaft 4 and satisfying an inequality given by Ll < LO < 2Ll where Ll is the center-to-center distance between the dn faces of the core.