Automotive wheel speed sensor assembly with rotor and stator, on

Details Automotive wheel speed sensor assembly with rotor and stator, on Automotive wheel speed sensor assembly with rotor and stator, on

1989-02-02

1990-11-13

Strecker, Gerard R.

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

73519, 188181R, 310168, G01P 3488, B60T 832, H02K 2126

Patent

active

049704621

ABSTRACT:
There is described a speed sensor that is particularly adaptable to moving vehicles such as automobiles. A permanent magnet, stator assembly, and field coil are held within a ferromagnetic cup that is adapted to mate a bearing assembly of a non-driven wheel of the vehicle. A rotor assembly is carried by the wheel spindle. The rotor assembly has poles spaced entirely around the circumference of a circle while the stator assembly has only a few poles distributed over an arc of a portion of a circle. A magnetic flux is provided by the permanent magnet, which flux passes through the stator poles and the rotor poles. The ferromagnetic cup completes a flux path between the stator and rotor poles, and also to the magnet. The rotor poles rotate with the wheel, causing a changing magnetic flux which in turn generates an alternating voltage current in the field coil. The alternating current so generated is then fed through an electrical terminal to a vehicle computer.

REFERENCES:
patent: 2798976 (1957-07-01), Eckel et al.
patent: 3619678 (1971-11-01), Ruof
patent: 3683219 (1972-08-01), Kruse
patent: 3870911 (1975-03-01), Toyama et al.
patent: 3960248 (1976-06-01), Tribe
patent: 4096624 (1978-06-01), Gray et al.
patent: 4529933 (1985-07-01), Bleeke
patent: 4689557 (1987-08-01), Smith et al.

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