Method and apparatus for controlling motion in a counterbalancing system
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United States of America Patent
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May 15, 2018
Issued Date -
N/A
app pub date -
Jan 27, 2017
filing date -
Jan 29, 2016
priority date (Note) -
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status (Latency Note)
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Abstract
A method and system for reducing rollback in a counterbalancing system as a holding brake is released is disclosed. A limited amount of movement of a drive shaft is present in the holding brake. A motor drive provides current to the motor with the holding brake set such that a torque is applied at the drive shaft. The current is controlled to generate torque in both directions. The limited amount of movement in the brake may be used to determine a direction and magnitude of torque required to support a mechanical load being applied to the motor. The motor drive then provides a current to generate the necessary torque required to support the load prior to releasing the holding brake.
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