| 摘要 |
A measuring arrangement for contact-free measurement of a rotation angle and/or torque on a stationary or rotating shaft has two sleeves (18, 19) which are fastened to the shaft extensions (11, 12). The sleeves (18, 19) can be mutually rotated and their outer surfaces are divided into an equal number of a plurality of segment-like superficies (22 or 25) parallel to the shaft axis (17) which in the circumferential direction possess alternate high and low electrical conductivity. Each sleeve (18, 19) is surrounded in the region of the grooves (26 or 27) of the inner sleeve (19) by two coils (31, 32 or 33, 34) which are incorporated in a Wheatstone bridge circuit. The high-frequency alternating current flowing through the coils (31 to 34) generates a magnetic alternating field which generates eddy currents in the superficies of the two sleeves (18, 19). The greater the surface of the sleeves acted on by the magnetic alternating field the greater the eddy current. The measuring arrangement possesses high sensitivity and outstanding reliability. |
