Speed and direction detector

Details Speed and direction detector Speed and direction detector

1980-07-28

1983-01-25

Krawczewicz, Stanley T.

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

324165, G01P 348, G01P 354

Patent

active

043706142

ABSTRACT:
A speed detector including a circular rotational member having a plurality of equally spaced-apart teeth on the outer circumference thereof, and first and second magnetic sensors. The first and second magnetic sensors each comprise a permanent magnet, a magnetic pole which permits the passage therethrough of a magnetic flux generated by the permanent magnet, and a detection coil wound on a portion of the magnetic pole. The magnetic poles of the first and second magnetic sensors are disposed in close proximity to, and arranged to face, the teeth on the rotational member, whereby each magnetic sensor produces an alternating output signal as the rotational member rotates, the frequency of each output signal being proportional to the speed of the rotational member. The direction in which the rotational member rotates can be detected by disposing the magnetic poles of the first and second magnetic detectors such that one of them is displaced circumferentially with respect to the other by an angular distance which is equivalent to 1/4 of the pitch of the teeth arrayed on the rotational member.

REFERENCES:
patent: 3437956 (1969-04-01), Davis
patent: 3728565 (1973-04-01), O'Callaghan
Crisp, Direction and Speed Detection Circuit, IBM Technical Disclosure Bulletin, vol. 15, No. 4, Sep. 1972, pp. 1198 & 1199.

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