Cab signal sensor with noise suppression

Details Cab signal sensor with noise suppression Cab signal sensor with noise suppression

1995-06-16

1996-12-24

Le, Mark T.

Railway switches and signals

Cab signal or train control

Train mechanism

246 63R, B61L 300

Patent

active

055867367

ABSTRACT:
Apparatus for sensing coded cab current information in a high level noise environment, caused by the magnetic fields of AC traction motors employed in the locomotive, utilizes pickup coils each having an upright axis and an axially extending, ferrite core. The coils are employed in pairs on a common magnetic structure located over an underlying rail, the coils being spaced apart horizontally and transversely of the rail. Magnetic flux resulting from the cab current is directed in opposite axial directions through the coils, whereas magnetic flux produced by the AC traction motors is directed through the coils in the same axial directions. This results in the addition of the voltages induced in the coils by the cab current, and voltage subtraction in response to the interfering magnetic field produced by the AC motors.

REFERENCES:
patent: 2071056 (1937-02-01), Allison
patent: 2662934 (1953-12-01), Allison
patent: 3060311 (1962-10-01), Porter
patent: 3555270 (1971-01-01), Persson
patent: 4081160 (1978-03-01), Devy et al.
patent: 4508298 (1985-04-01), Salmon
patent: 4720067 (1988-01-01), Jaeger
patent: 5234184 (1993-08-01), Chew

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