Device for determination of the rotation direction of a moving part uses a single magnetic type sensor in conjunction with the shape of the outer surface of the moving part

摘要

Device in which the shape of the moving part (10) is such that when the signal of a sensor (14a) is compared with digital trigger levels an output signal (S1, S2) is generated that is dependent on the rotation direction. The sensor can be a magneto- resistive element, a Hall sensor etc. Lengths (L1, L2) of teeth (11) on the rotating component and recesses (12) are different.