Crane apparatus, container yard, and feeding method
AssigneeMitsui Engineering & Shipbuilding Co., Ltd.
InventorsMasaharu Kawaguchi, Soshi Sato, Koji Ohi
Life of this patent
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Abstract
A three-phase full-wave rectifier (21) performs full-wave rectification of three-phase AC power (11A) supplied from ground power supply equipment, and supplies obtained DC power (12A) to a common bus (B). A Δ-Y connection type three-phase transformer (2) outputs three-phase AC power (11B) of a voltage phase shifted by π/6 from the three-phase AC power (11A). A three-phase full-wave rectifier (22) performs full-wave rectification of the three-phase AC power (11B) output from the three-phase transformer (2), and supplies obtained DC power (12B) to the common bus (B).
Claims8
A crane apparatus comprising:
- a first three-phase full-wave rectifier configured to perform full-wave rectification of first three-phase AC power supplied from ground power supply equipment, and to supply obtained DC power to a common bus;
- a three-phase transformer configured to output second three-phase AC power of a voltage phase shifted by π/6 from the first three-phase AC power;
- a second three-phase full-wave rectifier configured to perform full-wave rectification of the second three-phase AC power output from said three-phase transformer, and to supply obtained DC power to the common bus;
- and
- a motor configured to be driven to hoist and lower a container based on the DC powers supplied from said first and second three-phase full-wave rectifiers to the common bus.
A container yard comprising:
- feeder lines extending in a mounting place of a container and configured to feed operating power to a crane apparatus which performs handling of the container;
- and
- a plurality of three-phase transformers provided for said respective feeder lines, and configured to transform a voltage of power-supply power supplied from host power supply equipment, and to supply obtained operating power to said feeder lines,
- wherein one of two paired three-phase transformers among said three-phase transformers is constituted by a first three-phase transformer configured to output, as the operating power, first three-phase AC power of the same voltage phase as a voltage phase of the power-supply power, and the other three-phase transformer of said two paired three-phase transformers is constituted by a second three-phase transformer configured to output, as the operating power, second three-phase AC power of a voltage phase shifted by π/6 from the voltage phase of the power-supply power.
A feeding method used in a crane apparatus that drives a motor to hoist and lower a container based on DC power supplied to a common bus, comprising the steps of:
- causing a first three-phase full-wave rectifier to perform full-wave rectification of first three-phase AC power supplied from ground power supply equipment, and to supply obtained DC power to the common bus;
- causing a three-phase transformer to output second three-phase AC power of a voltage phase shifted by π/6 from the first three-phase AC power;
- and
- causing a second three-phase full-wave rectifier to perform full-wave rectification of the second three-phase AC power output from the three-phase transformer, and to supply obtained DC power to the common bus.
A feeding method used in a container yard including feeder lines extending in a mounting place of a container and configured to feed operating power to a crane apparatus which performs handling of the container, and a plurality of three-phase transformers provided for the respective feeder lines, and configured to transform a voltage of power-supply power supplied from host power supply equipment, and to supply obtained operating power to the feeder lines, comprising the steps of:
- causing a first three-phase transformer that is one of two paired three-phase transformers among the three-phase transformers to output, as the operating power, first three-phase AC power of the same voltage phase as a voltage phase of the power-supply power;
- and
- causing a second three-phase transformer that is the other three-phase transformer of the two paired three-phase transformers to output, as the operating power, second three-phase AC power of a voltage phase shifted by π/6 from the voltage phase of the power-supply power.
Dependencies are inferred from the claim text.