Position detecting signal generator

Details Position detecting signal generator Position detecting signal generator

1981-10-14

1984-03-20

Krawczewicz, Stanley T.

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

324160, G01P 366, G01P 342

Patent

active

044383983

ABSTRACT:
Apparatus for generating a signal corresponding to a reference phase of a reference rotor of a motor relative to the stator, includes a field magnet having a plurality of north and south poles mounted on the rotor; a Hall-effect element associated with the field magnet and mounted on the stator for generating a position signal corresponding to the position of the rotor relative to the stator for use in changing-over energization of coils on the stator; a plurality of equally spaced cut-out portions along the periphery of the rotor forming a plurality of equally spaced toothed portions; an optical detector associated with the toothed portions and mounted on the stator for generating a speed signal corresponding to the rotational speed of the rotor relative to the stator; a differentiating circuit for differentiating the position signal to produce a differentiated signal; and an AND gate supplied with the differentiated signal and the speed signal for producing the phase signal corresponding to a reference phase of the rotor relative to the stator.

REFERENCES:
patent: 3383574 (1968-05-01), Manteuffel
patent: 3517289 (1970-06-01), Brunner
patent: 3819268 (1974-06-01), Johnson
patent: 4096419 (1978-06-01), Wren
King; "Tachometer Circuits"-IBM Bulletin-vol. 23, No. 3--Aug. 1980--pp. 962-963.

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