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Speed and direction detector

  • US 4,370,614 A
  • Filed: 07/28/1980
  • Issued: 01/25/1983
  • Est. Priority Date: 07/25/1979
  • Status: Expired due to Term
First Claim
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1. A speed and direction detector for detecting the rotational speed and the rotational direction of a rotary machine, comprising:

  • a circular rotational member having a plurality of equally speced-apart teeth on the outer circumference thereof;

    first and second magnetic sensors positioned in such a manner that said first magnetic sensor is located at a position displaced circumferentially from one of said equally spaced-apart teeth of said circular rotational member by an angular distance equivalent to 1/4 of the pitch of said equally spaced-apart teeth when said second magnetic sensor is directly opposite one of said equally spaced-apart teeth;

    a rotational direction discriminating circuit operatively connected to said first and second magnetic sensors; and

    a housing including a yoke member to which said first and second magnetic sensors are fixedly secured;

    said first and second magnetic sensors each comprising;

    a permanent magnet secured fixedly to the yoke member of the housing;

    a magnetic pole extending from said permanent magnet and positioned so as to face the equally spaced-apart teeth on said circular rotational member; and

    a detection coil wound upon said magnetic pole, said permanent magnet, said magnetic pole, said equally spaced-apart teeth on said circular rotational member, the body of said rotational member and said housing forming a magnetic path.

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