| 摘要 |
PROBLEM TO BE SOLVED: To suppress a loss of a booster in the state where servo control is turned off for a generator-motor and a motor in a hybrid work machine.SOLUTION: A hybrid hydraulic excavator 1 includes: a generator-motor 19 connected to a drive shaft 20 of an engine 17; a capacitor 25 for storing at least power generated by the generator-motor 19; a slewing motor 23 driven by at least either power generated by the generator-motor 19 or power stored in the capacitor 25; a booster 26 which includes two sets of bridge circuits each including a plurality of switch elements and which is provided among the generator-motor 19, the slewing motor 23 and the capacitor 25; and a booster control part C21 which turns a phase difference of voltages output from the bridge circuits to 0 during a standby time in which the generator-motor 19 does not generate power and the slewing motor 23 is in a standby state. |
