Yanmar Power Technology Co., Inc.

Kensuke Kaneda

Jun Terashima

Naohiro Hara

Shingo Eguchi

Keishi Yamanaka

Masaki Yamada

Tatsuya Fujimori

A hydraulic shovel is provided with a lower travelling body and an upper revolving body revolvably disposed on the lower travelling body. The hydraulic shovel is also provided with a motor disposed on the upper revolving body for driving the hydraulic shovel, a first battery unit disposed on the upper revolving body, a second battery unit disposed on the lower travelling body, and a power supplier that supplies external power to the first battery unit and the second battery unit.

Electrically powered construction machine

A construction machine includes an attitude sensor that detects the current attitude of an upper turning body; a reference angular acceleration calculation unit that calculates a reference angular acceleration to be generated when an electric turning motor is driven by a torque command value generated according to the operation amount of an operation part; a reference gravity torque calculation unit that, on the basis of the current attitude and the deviation between an actual angular acceleration, calculates a reference gravity torque; a gravity compensation torque calculation unit that calculates a gravity compensation torque for compensating a torque component generated about the turning axis by the gravity in the current attitude; and a correction unit that corrects the torque command value by using the gravity compensation torque so as to cancel the torque component generated about the turning axis by the gravity in the current attitude.

Construction machine

An excavator comprising: an electric motor having a commercial power supply and a battery as the drive power sources therefor; and a hydraulic actuator having a hydraulic pump driven by the electric motor, as the hydraulic source therefor. The excavator has: a first power supply mode in which the electric motor is driven while the battery is being charged by the commercial power supply; and a second power supply mode in which the electric motor is driven only by the battery. A power supply cable for supplying power from the commercial power supply is connected to a power supply port and, if the electric motor has stopped operating, the excavator moves from the second power supply mode to the first power supply mode.

Electric work machine

An excavator comprising: a power supply that converts AC power supply voltage from a commercial power supply into DC power supply voltage; a battery that charges or discharges power from the power supply; an inverter that converts DC power supply voltage to AC power supply voltage; an electric motor that has power supplied thereto, and is controlled, by the inverter; a first electrical circuit that supplies power to the inverter from the power supply; a second electrical circuit that joins from the battery to the first electrical circuit; an inverter relay arranged between the inverter and a junction point between the first electrical circuit and the second electrical circuit; a battery relay arranged between the junction point and the battery; and a power supply relay arranged between the junction point and the power supply.

Growing community of inventors

Chikugo, Japan

Kensuke Kaneda