Sumitomo Heavy Industries, Ltd.

Sumitomo(s.h.i.) Construction Machinery Co., Ltd.

Sumitomo Heavy Industries Engineering & Services Co., Ltd.

Noriyuki Nishiyama

Kiminori Sano

Hiroso Shono

A turning drive control apparatus that controls a drive of a turning mechanism of a construction machine driven to turn by an electric motor, includes: a drive command creation part that creates a drive command to drive the electric motor based on an amount of operation input through an operation part of the construction machine; a turning motion detection part that detects a turning motion of the turning mechanism; and a drive command correction part that corrects the drive command, when a turning motion in a direction opposite to a turning operation direction input to the operation part is detected by the turning motion detection part, to suppress the turning motion in the direction opposite to the turning operation direction in response to a degree of the turning motion in the direction opposite to the turning operation direction.

Turning drive control apparatus and construction machine including the same

To provide a hybrid power supply device capable of properly controlling an operation of an engine generator and also preventing the device from increasing in size. The power supply device including an engine generatorand a capacitorcomprises: a DC bus La having the engine generatorand the capacitorconnected in parallel and supplying electric power to an outside; a step-up converterprovided between the DC bus La and the engine generator; and a control sectioncontrolling the step-up converterand regulating electric power supplied from the engine generatorto the DC bus La. Since both of the engine generatorand the capacitorcan supply electric power to the outside, the engine generatorcan be downsized. If the control sectioncontrols the step-up converter, the electric power supplied from the engine generatorto the DC bus La can be regulated, and therefore, a load variation of the engine generatorcan be suppressed to a variation of electric power supplied from the power supply device to the outside.

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Niihama, Japan

Noriyuki Nishiyama