| 摘要 |
PURPOSE:To improve the S/N of a torque sensor and the perform stable detection, by using a gate pulse signal synchronized with the number of revolutions of a torque transmission shaft and obtaining the change in the magnetic characteristic of a specific section in the peripheral direction of a thin strap of a magnetic metal as detection signals in one detection signal per one rotation. CONSTITUTION:Annular magnetic cores 221 and 222 are fixed to the outer perriphery of a torque transmission shaft 21 made of a ferromagnetic substance and induced magnetic anisotropies are given in advance to the magnetic cores 221 and 222 in directions respectively inclined at angles +theta and -theta against the peripheral direction of the magnetic cores 221 and 222. Moreover, U-shaped magnetic cores 231 and 232 for detection made of an oxide magnetic substance are respectively arranged above the annular magnetic cores 221 and 222 in the peripheral direction of the magnetic cores 221 and 222 under non-contacting conditions. Torque detection is performed by using output voltages obtained from specific sections of the magnetic cores 221 and 222 as detection signals in one signal per one rotation by utilizing a gate pulse signal synchronized with the number of revolutions of the torque transmission shaft 21. |
