A revolving drive control device comprises a revolution operating lever (19a), a revolving hydraulic motor (31), a main hydraulic pump (32), a first electric motor (34), a main control valve (36), hydraulic fluid pressure detection sensors (40a, 40b), a re...

Disclosed are a horsepower control system for a hybrid excavator and a control method thereof which controls the driving of a generator driver or a swing motor driver with a swing power ratio of 1 and a hydraulic power ratio of 1 in a first operation mode,...

[Object] To downsize a hybrid construction machine and to make a rotation electric motor of the construction machine operable immediately following the start-up of an engine. [Means to Achieve the Object] A generator 5 connected to an engine 2 generates AC...