Cab signal pickup system with motor noise reduction

Details Cab signal pickup system with motor noise reduction Cab signal pickup system with motor noise reduction

1995-01-31

1997-05-13

Le, Mark T.

Railway switches and signals

Cab signal or train control

Train mechanism

246 63R, B61L 1500

Patent

active

056284780

ABSTRACT:
Inductive pickups for sensing coded cab current information employ short ferrite cores and exhibit a pronounced roll-off characteristic to provide a detection system that may be used with locomotives powered by alternating current traction motors. Desired response is enhanced by connecting the inductors in phase in a tuned circuit and by employing a cancelling coil in phase opposition that receives interfering motor noise but is insensitive to the coded information.

REFERENCES:
patent: 2071056 (1937-02-01), Allison
patent: 2662934 (1953-12-01), Allison
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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