B - Operations – Transporting – 61 – L
Patent
B - Operations, Transporting
61
L
B61L 13/04 (2006.01) B61L 1/16 (2006.01) B61L 25/00 (2006.01) G01P 13/00 (2006.01) G08C 21/00 (2006.01)
Patent
CA 2115104
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.
Macrae & Co.
Union Switch & Signal Inc.
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