Method and arrangement for operating a ship ramp
AssigneeABB AB
InventorMikael Holmberg
Life of this patent
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Abstract
A method and arrangement are provided for operating a ship ramp driven by an electric motor between an upper end position and a lower end position. The arrangement includes means for reducing the maximum torque of the at least one electric motor when the ramp is in proximity to an end position of the ramp, and means for determining the position of the ramp on the basis of at least one of the number of rotations performed by the at least one electric motor, a quantity indicative of the number of rotations, and an elapsed time in accordance with the velocity of the ramp. The arrangement also includes means for allowing the reduction of the maximum torque of the at least one electric motor only when the determined position of the ramp is within a zone defined by predetermined limits.
Claims23
A method for operating a ship ramp between an upper end position and a lower end position, the method comprising:
- driving the ramp towards the upper end position or the lower end position by at least one electric motor;
- reducing a maximum torque of the at least one electric motor when the ramp is in proximity to an end position of the ramp;
- and
- allowing the reduction of the maximum torque of the at least one electric motor only when the position of the ramp, which is determined on the basis of at least one of a number of rotations performed by the at least one electric motor, a numerical quantity indicative of the number of rotations performed by the at least one electric motor, and an elapsed time in accordance with a velocity of the ramp, is determined to be within a zone defined by predetermined limits.
An arrangement for operating a ship ramp driven by an electric motor between an upper end position and a lower end position, the arrangement comprising:
- means for reducing the maximum torque of the at least one electric motor when the ramp is in proximity to an end position of the ramp;
- and
- means for allowing the reduction of the maximum torque of the at least one electric motor only when the position of the ramp, which is determined on the basis of at least one of a number of rotations performed by the at least one electric motor, a numerical quantity indicative of the number of rotations performed by the at least one electric motor, and an elapsed time in accordance with a velocity of the ramp, is determined to be within a zone defined by predetermined limits.
A system for operating a ship ramp driven by an electric motor between an upper end position and a lower end position, the system comprising a processing device configured to:
- reduce the maximum torque of the at least one electric motor when the ramp is in proximity to an end position of the ramp;
- and
- allow the reduction of the maximum torque of the at least one electric motor only when the position of the ramp, which is determined on the basis of at least one of a number of rotations performed by the at least one electric motor, a numerical quantity indicative of the number of rotations performed by the at least one electric motor, and an elapsed time in accordance with a velocity of the ramp, is determined to be within a zone defined by predetermined limits.
Dependencies are inferred from the claim text.