The present invention reduces loading and unloading time without changing the amount of power consumed by way of controlling a motor (22) of a crane (10) so as to raise or lower a container (C1), regardless of the load (W1) of the container (C1), at a fixed first acceleration by way of a first maximum torque (Tm) that is the maximum torque of a constant torque region (A2), from the start of raising or lowering the container (C1) until reaching a standard speed (V0), and to raise or lower at a second acceleration, that varies at a fixed interval by way of a calculated second torque, from the standard speed (V0) to a maximum speed (Vmax) calculated from the load (W1), by calculating, at a predetermined fixed time interval, the second torque that is the difference between a holding torque (Tw) and a second maximum torque (Tv) that is the maximum torque inversely proportional to a speed (V1); determined by the constant torque region (A2).
Method for controlling port loading and unloading equipment to reduce loading and unloading time, and port loading and unloading equipment
2015-09-09
Patent
Elektronische Ressource
Englisch
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