Patent ID: 7249527

Claim:
A system for determining the absolute torque applied to a rotating shaft, said system comprising a sensing element deformable under torsion under the action of the torque applied to the shaft, said system comprises a measuring device comprising: a first coder and a second coder rotationally fixed, respectively, close to each end of the sensing element, the coders each include at least one singularity equally distributed with an angular difference greater than a maximum deformation value in use of the sensing element, an angular distribution of the at least one singularity is identical on the coders; a first fixed sensor and a second fixed sensor disposed opposite and at an air gap distance, respectively, from the first coder and the second coder, each of the sensors delivers a signal having a pulse corresponding to a detection of the at least one singularity of the corresponding coder; wherein said system further comprises a device for processing the signals issuing from the sensors which, after measurement of the at least one singularity on each coder, calculates the angular difference between a plurality of singularities to determine, by comparison with a calibration difference, the absolute torque applied.