Working machine
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United States of America Patent
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Aug 5, 2014
Issued Date -
N/A
app pub date -
Apr 10, 2009
filing date -
Apr 11, 2008
priority date (Note) -
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status (Latency Note)
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Abstract
A working machine includes: a first electric motor used for work; a second electric motor used for applications other than work; a first inverter circuit connected to the first electric motor; a second inverter circuit connected to the second electric motor; a battery connected to the first and second inverter circuits; and a control unit that drives the first and second inverter circuits. The control unit has a discharge mode to discharge electric power stored in the battery, and discharges the battery by stopping the first inverter circuit while driving the second inverter circuit in order to make the second electric motor perform electric operation in the discharge mode. Accordingly, since the state of charge is reduced, the life of a capacitor can be increased.
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