Railway switches and signals – Electric actuation – Car-actuated circuit controllers
Patent
1993-02-18
1994-08-02
Huppert, Michael S.
Railway switches and signals
Electric actuation
Car-actuated circuit controllers
324179, 246122R, B61L 1304
Patent
active
053338200
ABSTRACT:
A differential magnetic wheel detector is disclosed which identifies the presence and direction of a railway vehicle. The wheel detector includes a primary winding, a secondary winding and signal processing circuitry. The primary winding is excited by a source of AC energy to produce a magnetic flux in the wheel of the railway vehicle. The secondary winding senses a change in voltage induced by the magnetic flux in the railway wheel. The secondary winding includes two coils in a differential bridge which prevents external factors from interfering with the sensing of the wheel. The signal processing device transforms the voltage change into a signal identifying the presence and direction of the railway vehicle.
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Huppert Michael S.
Lowe Scott L.
Union Switch & Signal Inc.
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