Power cable spooling/unspooling device
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United States of America Patent
Stats
-
Mar 15, 1994
Grant Date -
N/A
app pub date -
Jan 25, 1993
filing date -
Jan 27, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a device for spooling and unspooling a power cable or the like on relative displacement of two areas connected to each other by the cable or the like, spooling and unspooling of the cable are powered by an asynchronous motor whose output shaft is permanently engaged without slip with the cable spooling and unspooling drum. The speed and rotation direction of the motor output shaft are controlled in relation to the measured tension in the cable by variable frequency control of the supply of power to the motor to maintain the tension at an approximately constant value. Provision is made for applying calibrated undirectional braking to the output shaft of the motor in the direction corresponding to the cable unspooling direction. This maintains motor control during unspooling of the cable.
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