Electric hoisting machine and control device and control method therefor
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United States of America Patent
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Dec 26, 2023
Grant Date -
May 7, 2020
app pub date -
Apr 16, 2018
filing date -
Apr 17, 2017
priority date (Note) -
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Abstract
A control device that controls an electric hoisting machine includes: a tension sensor that detects tension of a pulling member; a mode input unit that inputs a mode switch signal to switch between a winding mode and an unwinding mode; and a control unit that controls the operation of a electric motor. The control unit, when set in the unwinding mode, controls the electric motor in accordance with a detection signal from the tension sensor to cause the rotating body to be inversely rotated when the tension of the pulling member is not less than a predetermined threshold value, and to prevent the rotating body from being inversely rotated when the tension of the pulling member is lower than the predetermined threshold value.
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