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

1979-04-18

1981-08-11

Smith, Alfred E.

Electricity: measuring and testing

Electrical speed measuring

Including speed analog electrical signal generator

324174, 324208, 340672, G01P 352, G01P 1300

Patent

active

042836794

ABSTRACT:
A rotational direction detection device is disclosed which has a single permanent magnet rotatable in response to the rotation of a rotary shaft. A magnetic field sensor is composed of 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. The magnetic field detecting elements are arranged so that signals developed by at least two such elements differ in phase by a phase angle of other than 0 degree and 180 degrees. A rotary condition detector is responsive to the output of the magnetic field sensor for determining the rotational direction of the rotary shaft.

REFERENCES:
patent: 3299702 (1967-01-01), Hulme
patent: 3546579 (1970-12-01), Paul et al.
patent: 3559064 (1971-01-01), Grundy
patent: 3636767 (1972-01-01), Duffy
patent: 3835373 (1974-09-01), Matula
patent: 3900814 (1975-08-01), Masuda
patent: 3993946 (1976-11-01), Makino
patent: 4001689 (1977-01-01), Williams et al.
Gerald M. Walker, "Automatic Electronics Gets the Green Light," published in Electronics, Sep. 29, 1977, pp. 83-88.
A. B. Wills, IBM Technical Disclosure Bulletin, vol. 11, No. 1, (Jun. 1973 issue), p. 260.

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