Accurate position tracking for motorized lifting device
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United States of America Patent
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Jun 5, 2018
Issued Date -
N/A
app pub date -
Apr 4, 2014
filing date -
Apr 4, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
An apparatus includes a drum to draw in or let out a line and a motor and transmission coupled to the drum to apply a torque thereto. An encoder is provided to measure an angular position of the drum. A counter is provided to record a number of rotations of the drum. A locking mechanism automatically prevents rotation of the drum when the drum stops. Using this information, a processor may calculate an amount of line let out from the drum based on the number of rotations of the drum, the angular position of the drum, and a radius of the drum. In certain embodiments, the angular position and/or number of rotations is stored in non-volatile memory so that is can be recovered in the event of a power outage or other significant event.
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