Cab signal sensor with noise suppression
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United States of America Patent
Stats
-
Dec 24, 1996
Grant Date -
N/A
app pub date -
Jun 16, 1995
filing date -
Jun 16, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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