| 摘要 |
<P>PROBLEM TO BE SOLVED: To eliminate the need of the thermal conversion of regenerative electric power at the time of shutdown while an electric motor is configured to be driven so as to reduce the voltage among terminals of a capacitor for the discharge of the capacitor on the premise of a configuration in which both a hydraulic unit and an electric unit are used as a driving unit for driving a machine such as a revolving driving device. <P>SOLUTION: On the premise of a configuration in which an electric motor 11 is driven by the electric power in a capacitor 23 to assist the hydraulic unit in power operation of revolving and the regenerative electric power generated in the electric motor 11 is supplied to the capacitor 23 in regenerative operation, the electric motor 11 is driven based on the switch-on operation of an electric discharge switch 26 in the power operation so as to reduce the voltage among terminals of the capacitor, and no regenerated electric power is configured to be generated by deceleration/stop using only the hydraulic unit in the regeneration operation. <P>COPYRIGHT: (C)2012,JPO&INPIT |
