Importance

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Abstract

A device measures the torsional moment being exerted on a shaft. The device includes two magnetic circuits, essentially cylindrical and arranged around the shaft, each equipped with at least one permanent magnet generating a magnetic flux and with a variable air gap on the rotor. Each variable air gap includes two facing relative parts each fastened to the shaft at respective points offset with respect to each other in the longitudinal direction of the shaft, in such a manner that torsion of the shaft leads to a modification of the air gap which differs depending on the direction of the torque exerted. The two magnetic circuits include a common central yoke part with which is associated at least one measurement means sensitive to the algebraic sum of the magnetic fluxes.

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First Claim