VARIABLE-SPEED VOLUME-CONTROL DIRECT-DRIVE ALL-ELECTRIC HYDRAULIC EXCAVATOR DRIVE AND ENERGY RECOVERY SYSTEM

摘要

A variable-speed volume-control direct-drive all-electric hydraulic excavator drive and energy recovery system. For the drive control circuit thereof, an open-type controlled variable-speed pump-control volume direct-drive circuit with individual cavities is used. Two cavities of a hydraulic cylinder are separately controlled by a power source. The pressure and the flow of each cavity are controlled separately by means of speed and torque control of a motor.