Magnetic speed sensor

Details Magnetic speed sensor Magnetic speed sensor

1977-07-08

1983-04-05

Duggan, Donovan F.

Electrical generator or motor structure

Dynamoelectric

Rotary

310155, H02K 2138

Patent

active

RE0311995

ABSTRACT:
A speed sensor for a vehicle wheel has a rotating tone wheel with a stationary magnetic sensor having a pair of sensing poles positioned proximate the tone wheel teeth. Coil means are wound on the poles and the poles are magnetized to induce a signal voltage in the coil means corresponding to wheel speed. The poles are phased relative to the teeth on the tone wheel to reduce noise voltage components in the wheel speed signal voltage due to axial misalignment and vibration of the tone wheel. The poles may be phased 180.degree. relative to one another with respect to the teeth on the tone wheel so that one pole is in registry with a tooth when the other pole is in registry with a space between two teeth. With this arrangement the combined reluctance of the poles is approximately constant.

REFERENCES:
patent: 2110144 (1938-03-01), Durkee et al.
patent: 2484022 (1949-10-01), Esval
patent: 2689332 (1954-09-01), Greene
patent: 2853638 (1958-09-01), Bonnano et al.
patent: 3230407 (1966-01-01), Marsh, Jr.
patent: 3564313 (1971-02-01), Goor
patent: 3836800 (1974-09-01), Bonvicini

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