| 摘要 |
A method and apparatus for measuring torque of a rotating shaft is provided. In one embodiment, the apparatus (10) includes a transducer assembly (12) that is attached to a shaft. The transducer assembl y includes a first plate member (14), a plurality of webs (18) extending from the first plate member and a second plate member (16) connect ed to the webs. A plurality of strain gauges are mounted on the transducer assembly at selected locations and in selected patterns. As torque is applied to the shaft, the torsional load from the shaft causes stress in the first plate member, the web members, and the second pla te member. The strain gauges measure this stress and generate signals that provide a measure of the stress. The signals transmitted from t he sensing circuit are compared with calibration data, and the torque value is inferred. In one embodiment, the strain gauges are arranged in opposing pairs on the transducer assembly and electrically connected as a Wheatstone bridge, so that strain resulting from non-torsiona l loads is canceled from the measured signal, thereby improving torque measurement accuracy. In another embodiment, the strain gauges are located on thinned regions in the transducer assembly which are fashioned for the purpose of creating areas of localized high stress. In another embodiment, the transducer assembly includes a decoupling aperture. The decoupling aperture miminizes hysteresis due to warping and bending of the transducer assembly.
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