| 摘要 |
PURPOSE: A torque sensor apparatus is provided to simplify the production of the torque sensor by reducing the dependence on the existing technique for a magnetic polarization. CONSTITUTION: A torque sensor(8) comprises a shaft of magnetostrictive material and a pair of magnets(10,12) having oppositely sensed poles(11,13) positioned circumferentially around the shaft so as to induce a localized magnetic field in the shaft between the poles. A torque(38) applied to the shaft is sensed by a flux detector(18) positioned circumferentially between the magnet poles so as to detect a component of the localized magnetic field which escapes from the shaft as a result of the torque. With this design, there is no need to permanently magnetize the shaft or a collar attached to the shaft, as in the prior art. The prior art manufacturing step of permanently magnetizing the collar or its shaft is also thus eliminated, greatly simplifying the manufacturing.
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