Bearing rotary speed sensor with concentric multipole magnetic r

Details Bearing rotary speed sensor with concentric multipole magnetic r Bearing rotary speed sensor with concentric multipole magnetic r

1992-07-06

1994-05-03

Snow, Walter E.

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

32420715, 32420725, G01P 348, G01P 354

Patent

active

053090942

ABSTRACT:
A sensor device of speed of rotation of a rotating member mounted by way of a roller bearing on a non-rotating member, said device comprising a coder element (11) rigid with the rotating race (6) of the bearing and producing an alternating magnetic field and a sensor element (12) rigid with the non-rotating race (7) of the bearing and arranged facing the coder element with an air gap, the coder element (11) comprising two axially magnetized concentric multipole rings (14, 15), and the sensor element (12) comprising an induction coil (17) coaxial with the multipole rings cooperating with a magnetic flux concentrator (18) whose collector branches (20, 21) are oriented axially facing said multipole rings (14, 15) of the coder element. Application to motor vehicle wheel hubs equipped with an ABS system.

REFERENCES:
patent: 3786272 (1974-01-01), Gamble et al.
patent: 3927339 (1975-12-01), Paul et al.
patent: 5004358 (1991-04-01), Varvello et al.
patent: 5191284 (1993-03-01), Moretti et al.

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