Variable reluctance electromagnetic sensor with pole piece-magnet assembly locking mechanism and method of assembly
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United States of America Patent
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May 9, 1989
Grant Date -
N/A
app pub date -
Dec 8, 1987
filing date -
Dec 23, 1986
priority date (Note) -
Expired
status (Latency Note)
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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.
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