Title: Magnetic speed sensor

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.

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Inventors: Peterson, Arnold Duane (Bainbridge, NY, US)

Application Number: 560075
Filing Date: 1975-03-20
Publication_date: 1976-09-14
Assignee: The Bendix Corporation (Southfield, MI)
Primary Class(es): 310/155 310/168
Other Classes:
US Patent Ref:

1977600	Oct, 1934	Winther	310/218.
2718603	Sep, 1955	McLean	310/155.
3158033	Nov, 1964	Cohen	310/155.
3230407	Jan, 1966	Mars, Jr.	310/168.
3252024	May, 1966	Loudon	310/155.
3738175	Jun, 1973	Linsig	338/32.
3793545	Feb, 1974	Leiber et al.	310/168.
3876927	Apr, 1975	Gee et al.	310/155.

Other Refs:
Primary Examiner: Duggan, Donovan F.
Assistant Examiner:
Attorney: Hartz; S. H.