ELECTRIC CONSTRUCTION MACHINE
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United States of America Patent
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N/A
Issued Date -
Dec 5, 2013
app pub date -
Jan 18, 2012
filing date -
Feb 21, 2011
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
Provided is an electric construction machine capable of avoiding a situation where charging is difficult to achieve due to the exhaustion of a battery device. An electrically-operated hydraulic excavator includes an electric motor, a hydraulic pump that is driven by the electric motor, hydraulic actuators that are driven by hydraulic fluid discharged from the hydraulic pump, and a battery device that serves as an electrical power source for the electric motor. The battery device includes battery systems that each have a plurality of batteries. A selector switch makes it possible to select either one of the battery systems. An arithmetic control section of an inverter device controls connection change switches through battery controllers to change the connections of the battery systems so that electrical power is supplied to the electric motor from either the battery system or the battery system, whichever is selected by the selector switch.
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