Magnetic speed sensor

Details Magnetic speed sensor Magnetic speed sensor

1975-03-20

1976-09-14

Duggan, Donovan F.

Electrical generator or motor structure

Dynamoelectric

Rotary

310168, H02K 2138

Patent

active

039809137

ABSTRACT:
A device for providing signals corresponding to rotation of a body having a magnetic sensor with a sensing pole positioned proximate to a tone wheel rotated by the rotating body. A permanent magnet is attached to the sensing pole and a signal voltage having a frequency proportional to the speed of the rotating body is induced in a coil surrounding the sensing pole. The sensing pole is made of square loop magnetic material and is shaped and arranged to cause the magnetomotive force difference between its pole face and the tone wheel to decrease as the air gap length between them decreases, thus causing the normally large change in sensor output with air gap length variation to be substantially reduced.

REFERENCES:
patent: 1977600 (1934-10-01), Winther
patent: 2718603 (1955-09-01), McLean
patent: 3158033 (1964-11-01), Cohen
patent: 3230407 (1966-01-01), Marsh, Jr.
patent: 3252024 (1966-05-01), Loudon
patent: 3738175 (1973-06-01), Linsig
patent: 3793545 (1974-02-01), Leiber et al.
patent: 3876927 (1975-04-01), Gee et al.

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