A shovel includes an internal combustion engine (11), a hydraulic pump (14) connected to the internal-combustion engine, a generator (12) connected to the internal-combustion engine, and a control part (30) that controls the generator. The control part (30...

A turning body (3) is driven to turn by a turning electric motor (21). A turning brake hydraulic motor (40) is mechanically connected to the turning body (3) or the turning electric motor (21). By disconnecting the intake port and the discharge port of the...

A shovel includes an engine; a hydraulic pump driven by the engine; an attachment including a boom, the attachment being driven with hydraulic fluid discharged by the hydraulic pump; a motor generator configured to assist driving by the engine; an electric...

A hydraulic shovel includes an engine; a hydraulic pump driven by the engine; an excavating attachment which is driven by high oil discharged from the hydraulic pump; a motor generator that assists a power supply of the engine; and an assist control unit t...

A turning drive control unit configured to control driving of the rotation mechanism of a construction machine driven to turn by an electric motor includes a drive command generation part configured to generate a drive command driving the electric motor ba...