Speed insensitive wheel detector

Details Speed insensitive wheel detector Speed insensitive wheel detector

G - Physics

01

P

340/124.3

G01P 13/00 (2006.01) B61L 1/08 (2006.01) B61L 1/16 (2006.01)

Patent

CA 1116718

SPEED INSENSITIVE WHEEL DETECTOR Abstract of the Disclosure An apparatus for detecting the presence and/or di- rection and/or velocity of a moving ferromagnetic element is provided. A sensing coil is placed in coupling relationship with a bi-stable ferromagnetic wire to provide a signal in response to a change in polarity of the core of the bi-stable wire. The core polarity changes in response to element pres- ence as the element constitutes a magnetic shunt causing a change in magnetic flux density and/or direction in the air gap of a magnetic circuit in which the bi-stable wire is situated. The sensor is substantially insensitive to element velocity. Modified structures provide for fail-safe operation.

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