ELECTRIC CONSTRUCTION MACHINE
PROBLEM TO BE SOLVED: To provide an electric construction machine that supplies AC power from an external power source to an electric motor, capable of starting an electric motor, which is a drive source of a hydraulic pump even when the voltage of the in-vehicle battery drops.SOLUTION: A motor cont...
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| Format: | Patent |
| Sprache: | eng ; jpn |
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| Zusammenfassung: | PROBLEM TO BE SOLVED: To provide an electric construction machine that supplies AC power from an external power source to an electric motor, capable of starting an electric motor, which is a drive source of a hydraulic pump even when the voltage of the in-vehicle battery drops.SOLUTION: A motor control device 23 further includes an AC-DC converter 27 whose input side is connected to a first AC power feed cable 19C via a third AC power feed cable 28. An output side of the AC-DC converter is connected to a first DC power line 37 via a second DC power line 38, and the AC-DC converter converts AC power input via the third AC power feed cable into DC power having a voltage higher than the voltage of an in-vehicle battery 18 and outputs the DC power to the second DC power line.SELECTED DRAWING: Figure 4
【課題】外部電源からの交流電力を電動モータに供給する電動式建設機械であって、車載バッテリの電圧が低下した状態でも油圧ポンプの駆動源である電動モータを始動することができる電動式建設機械を提供する。【解決手段】モータ制御装置２３は、入力側が第３交流給電ケーブル２８を介して第１交流給電ケーブル１９Ｃに接続されたＡＣ−ＤＣコンバータ２７を更に備え、前記ＡＣ−ＤＣコンバータは、出力側が第２直流電力線３８を介して第１直流電力線３７に接続され、前記第３交流給電ケーブルを介して入力される交流電力を車載バッテリ１８の電圧よりも高い電圧の直流電力に変換して前記第２直流電力線に出力する。【選択図】 図４ |
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