Abstract: 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.

Abstract: Provided is a hydraulic shovel as an electric work machine, the hydraulic shovel comprising: a charger that supplies electric power from an external power source to a battery to charge the battery; an electric motor that is driven with electric power supplied from the battery; a hydraulic system including a hydraulic pump driven by the electric motor and a hydraulic actuator to which pressure oil is supplied by the hydraulic pump; a control unit that manages a physical quantity indicating the operation status of the electric motor as first operation information, and manages a physical quantity indicating the operation status of the battery including charging and discharging as second operation information; and an output unit that outputs the first operation information and the second operation information.

Abstract: 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.

Abstract: A control device includes a power storage unit, a balance processing unit, and a control unit. The power storage unit includes a plurality of battery cells, and supplies power to a load. In a case where the load stops, the balance processing unit can execute balance processing of reducing variation in the voltage of each of the plurality of battery cells according to the degree of the variation in the voltage. The control unit generates, for display, a state image indicating the state of the variation according to the degree of the variation.

Abstract: This hydraulic shovel used as an electric work machine comprises: an electric motor, an inverter, a hydraulic actuator, a hydraulic pump, a direction switching valve, a pilot pump, a remote control valve, an electromagnetic valve, an accumulator, and a control unit. The accumulator is positioned in an oil path that branches from an oil path for pilot oil extending from the pilot pump to the electromagnetic valve, and accumulates the pilot pressure generated by the pilot pump. The control unit controls the inverter to stop the rotation of the electric motor after an interruption due to a depowered state of the electromagnetic valve.

Abstract: An exemplary construction machine comprises a power supply device that is connected to an external power source and outputs first power, a battery provided to be chargeable with the first power, and an electric motor that is driven by the first power and/or second power discharged by the battery. The construction machine further comprises a control device that controls the construction machine in any of a plurality of modes including a drive chargeable mode in which the first power can be used for charging the battery while being used for driving the electric motor, and a charge-only mode in which the first power can be used only for charging the battery. In the case of the drive chargeable mode, the control device sets the upper limit value of the amount of charge of the battery lower than in the case of the charge-only mode.

Abstract: A continuously variable transmission includes a primary shaft, a secondary shaft, a primary pulley, a secondary pulley, a first power transmission member, a primary sprocket, a secondary sprocket, a second power transmission member, and a power transmission switch. The first power transmission member has a loop shape and is wrapped around the primary pulley and the secondary pulley. The primary sprocket is disposed on the primary shaft. The secondary sprocket is disposed on the secondary shaft. The second power transmission member has a loop shape and is wrapped around the primary sprocket and the secondary sprocket. The power transmission switch disables power transmission by the second power transmission member when the first power transmission member is in a normal condition and enables the power transmission by the second power transmission member when the first power transmission member is in an abnormal condition.

Abstract: The present invention discloses a configuration for cooling both an electric motor as a drive source and a device for supplying electric power to the electric motor using a cooling medium such as water with a view to achieving efficient cooling without any cost increase. The present invention comprises: an electric motor serving as a drive source; a power feeder for supplying electric power to the electric motor from outside; a cooling flow channel through which coolant water is circulated for cooling the electric motor and the power feeder; and a radiator which cools the coolant water flowing through the cooling flow channel.

Abstract: An electric construction machine includes a driving system configured to drive a machine body under electric power, a heat exchange device configured to exchange heat of a cooling medium for cooling the driving system, a cooling fan configured to send air for cooling the heat exchange device, and a cooling fan control unit configured to control the rotation of the cooling fan according to a set operating mode. The operating mode includes a driving mode in which the driving system is driven and a charging mode in which the driving of the driving system is stopped to charge a battery configured to store electric power. The cooling fan control unit is configured to set the rotation rate of the cooling fan in the charging mode to a charging mode rotation rate that corresponds to the driving state of the driving system.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: This construction machine comprises: 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 which is obtained from a rotation speed and the reference angular acceleration, calculates a reference gravity torque which is a torque component to be generated about the turning axis by the gravity in the reference attitude; a gravity compensation torque calculation unit that, on the basis of the reference gravity torque and the current attitude, calculates a gravity compensation torque for compensating a torque component generated about the turning axis by the gravity in the current attitude; and a correctio

Abstract: 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.

Abstract: 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.

Abstract: An excavator comprising: a battery; an electric motor having the battery as the drive power source therefor; a hydraulic actuator having a hydraulic pump driven by the electric motor as the oil pressure source therefor; a cut-off lever that limits operation of the hydraulic actuator by cutting off pilot pressure that operates the hydraulic actuator; an electric cooling pump that circulates cooling water through a cooling water path for cooling electrical equipment including the battery and the electric motor; an electric cooling fan that blows cooling air on to a radiator provided on the cooling water path; and a system controller that, if the cut-off lever is rotated upwards and a command to limit the hydraulic actuator is received, stops the electric motor, the cooling pump, and the cooling fan.

Abstract: The hydraulic apparatus is set so that the ratio of the pressure-receiving area of the respective bottom oil chambers of the boom cylinder, the arm cylinder and the bucket cylinder to the pressure-receiving area of the respective rod oil chambers matches the ratio of the extruded volume drawn into or discharged from the bottom oil chambers per single rotation by the respective extrusion members of the first hydraulic pump motor, the second hydraulic pump motor and the third hydraulic pump motor to the volume discharged from or drawn into the rod oil chambers.

Abstract: The hydraulic apparatus is set so that the ratio of the pressure-receiving area of the respective bottom oil chambers of the boom cylinder, the arm cylinder and the bucket cylinder to the pressure-receiving area of the respective rod oil chambers matches the ratio of the extruded volume drawn into or discharged from the bottom oil chambers per single rotation by the respective extrusion members of the first hydraulic pump motor, the second hydraulic pump motor and the third hydraulic pump motor to the volume discharged from or drawn into the rod oil chambers.

Abstract: There is provided a drive device for a vehicle. A forward clutch that is engaged during forward driving is provided in a power transmission path between an engine and a drive wheel. A spring is incorporated in an engagement oil chamber of the forward clutch, thereby causing the forward clutch to be held in a slipping state or an engaged state through the spring force even during an idling stop that suffers from reduced control oil pressure. This arrangement can prevent the forward clutch from producing an engagement shock during an engine restart. In addition, an input clutch driven by an electric actuator is provided in the power transmission path. With this arrangement, neutral control can be performed by disengaging the input clutch even if the forward clutch which is to be held in a slipping state or an engaged state is provided.