Magnetic speed sensing mechanism

Details Magnetic speed sensing mechanism Magnetic speed sensing mechanism

1975-06-02

1977-03-08

Duggan, Donovan F.

Electrical generator or motor structure

Dynamoelectric

Rotary

310166, H02K 2138

Patent

active

040114783

ABSTRACT:
A speed sensing mechanism for a motor vehicle skid control system has ferromagnetic portions spaced around the periphery of an exciter wheel, the exciter wheel being adapted to be mounted for movement with a motor vehicle wheel whose speed is to be monitored to move the ferromagnetic portions of the exciter wheel in a plane through a station at a rate or frequency corresponding to the speed of vehicle wheel rotation. A permanent magnet is disposed within a wire sensor coil and is mounted at the station with a first pole face in closely spaced relation to the plane of movement of the ferromagnetic portions of the exciter wheel so that the reluctance of the magnetic circuit established by the permanent magnet is varied as each of the ferromagnetic elements is moved through the station, thereby to induce an electrical signal in the coil having a frequency corresponding to vehicle wheel speed.

REFERENCES:
patent: 3158033 (1964-11-01), Cohen
patent: 3252024 (1966-05-01), Loudon
patent: 3424578 (1969-01-01), Strnat et al.
patent: 3793545 (1974-02-01), Leiber et al.
patent: 3876927 (1975-04-01), Gee et al.

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