Bi-directionally dynamically braked gate crossing mechanism controller
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United States of America Patent
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Oct 23, 2001
Grant Date -
N/A
app pub date -
Mar 23, 1999
filing date -
Nov 23, 1998
priority date (Note) -
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Abstract
The output voltage of a D.C. motor used to raise and lower a railroad crossing gate is monitored to detect when the D.C. motor begins to generate power, indicating that the motor is being driven by a rising gate arm. If the motor generates power above a adjustable predetermined value, the gate arm mechanism is considered to be operating too fast whereupon an impedance is shunted across the motor's armature thereby applying a load to the generating motor. The electrical load causes the motor to act as a dynamic brake slowing the gate arm mechanism operation and reducing the likelihood that the mechanical components of the crossing gate arm mechanism will be damaged.
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