PCT No. PCT/SE96/01326 Sec. 371 Date May 29, 1998 Sec. 102(e) Date May 29, 1998 PCT Filed Oct. 18, 1996 PCT Pub. No. WO97/22866 PCT Pub. Date Jun. 26, 1997A torque transducer comprising a shaft (1) with a circularly polarized ring (2) which, when loading the shaft with a torque, generates an axial static magnetic field in the shaft and wherein the ring is concentrically surrounded by a stationary tubular shell (3) which is freely arranged in relation to the shaft and which is provided with at least one winding (4, 8, 9) for magnetization of the shaft with a given frequency. A phase-sensitive detector (5) connected to the winding supplies a signal corresponding to the content of those voltages with even harmonics which are induced in the winding to the frequency of a controller (6). The controller generates a direct current which is proportional to the signal and is connected to the winding with such a polarity that it counteracts the static magnetic field generated in the shaft. This direct current constitutes a measure of the torque with which the shaft is loaded.
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