| 摘要 |
PURPOSE:To enable the enhancement of S/N and the stable detection of torque, by fixing one or plural thin magnetic metal strip having magnetostriction to a part of a torque transmission shaft in the peripheral direction thereof and arranging a detection magnetic core to the outer periphery of the rotary surface thereof. CONSTITUTION:A pair of thin magnetic metal strip 321, 322 are partially fixed to a torque transmission shaft 31 comprising a ferromagnetic body at two places in the axial direction thereof so as to apply induction magnetic anisotropies to directions respectively inclined at angles of theta, -theta to the peripheral direction of the transmission shaft 31. Further, a pair of U-shaped detection magnetic cores 331, 332 respectively provided with excitation winding 341, 342 and detection windings 351, 352 are arranged to the outer peripheries of the thin metal strips 321, 322 in a concentric circular form. In this case, the relation of the length (l) of a metal strip 21 and the length (l') of the effective magnetic path of a detection magnetic core 22 is brought to a range of l'<=l<=2l'. By this mechanism, S/N is enhanced and the stable detection of torque can be performed. |
