Rotational direction detection device for a motor or the like

Details Rotational direction detection device for a motor or the like Rotational direction detection device for a motor or the like

G - Physics

01

B

340/148.5

G01B 7/30 (2006.01) G01P 13/00 (2006.01) G01P 13/04 (2006.01)

Patent

CA 1136243

ABSTRACT OF THE DISCLOSURE The invention relates to a device for detecting the rotational direction of the rotating shaft of a motor, gear or the like. It is known to have a disc connected to the shaft, with either optical or magnetic signs which are read by a respective transducer to determine the rotational speed and direction of the disc. In the invention, there is provided a device comprising a permanent magnet which rotates in response to the motion of the rotating shaft of a rotating object and a magnetic field sensor which has a plurality of magnetic field detecting elements responsive to a rotating magnetic field produced by the rotation of the permanent magnet for generating an output representative of the rotation of the rotary shaft. At least two of the elements are arranged to form an angle other than 0 degree, 90 degrees, 180 degrees or 270 degrees. A rotary condition detector responsive to the output of the magnetic field sensor determines the rotational direction of the rotary shaft. The improvement consists in a compact light- weight and simpler device in comparison with conventional ones.

325526

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