| 摘要 |
An electrically driven mooring winch is disclosed. The mooring winch comprises a winding drum (101), an alternating current motor (103) arranged to drive the winding drum, a frequency conversion unit (104) connected to the alternating current motor, and a control unit (105) arranged to control the frequency conversion unit on the basis of an indicator for tension of the mooring rope. The control unit (105) is arranged to set a reference value of rotational speed of the ac motor (103) to a predetermined value, to drive the ac motor (103) in one direction for a predetermined time interval, to define a first value of a torque of the motor, and to drive the ac motor (103) in an opposite direction for the predetermined interval, to define a second value of the torque of the motor, and to compute a torque estimate using the first and the second value of the torque. |
