Variable reluctance electromagnetic sensor with pole piece-magne

Details Variable reluctance electromagnetic sensor with pole piece-magne Variable reluctance electromagnetic sensor with pole piece-magne

1987-12-08

1989-05-09

Strecker, Gerard R.

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

29607, 324208, 324228, 336 90, 336210, G01P 3488, H01F 2726, H01F 2730, G01B 730

Patent

active

048292451

ABSTRACT:
The invention is in the field of electromagnetic transducers. The sensor according to the invention includes an electrical winding 2 mounted on a carcass 1 hollowed with a cavity 7 which receives a metal pole piece 5 and a permanent magnet 6. According to the invention inclined ribs 20 are formed in the cavity 7 in order to constitute a means of progressively locking the magnet by the wedge effect during the insertion of this magnet and of the pole piece into the cavity. It is thus possible to accurately adjust the distance d which separates the end 21 of the pole piece from a reference surface 22 of the carcass 1. Application to the production of a shaft speed sensor or a wheel speed sensor for a motor vehicle.

REFERENCES:
patent: 2838738 (1958-06-01), Antalek et al.
patent: 3252024 (1966-05-01), Loudon
patent: 3649939 (1972-03-01), Hildebrandt
patent: 3793545 (1974-02-01), Leiber et al.
patent: 3890517 (1975-06-01), Marsh et al.
patent: 4510408 (1985-04-01), Jovick et al.
patent: 4618825 (1986-10-01), Fischer
patent: 4652818 (1987-03-01), Buchschmid et al.
patent: 4670715 (1987-06-01), Fuzzell
patent: 4680543 (1987-07-01), Kohen

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