Press Using Direct Drive Electro-hydraulic Servo System

In recent years, Direct Drive Electro-Hydraulic Servo System has attracted widely attention at home and abroad. The basic principle is that servo motor or variable-frequency motor drives fixed displacement hydraulic pump, by controlling the motor's direction of rotation, speed and torque, to realize the system's direction, position and force control. Because of its prominence advantages in the energy-saving and environment-protective, it has been developed rapidly in foreign countries and applied in some areas. Our country begins lately start at the study, still at the laboratory stage. The subject making press for the application background, researching the system's theoretical issues and key technology, will undoubtedly have Important theoretical significance and practical value.Based on lots of relevant materials at home and abroad about, this paper summarized research and application status, combined domestic progress of the system, identified the main research directions of the paper.The hydraulic motivity machine was designed based on one design parameter and performance target of press and selected the main components of the system. Initiative oil supply issue of closed circuit was solved by a set of screw-in cartridge check valves and pre-pressure closure oil tank contained PAF breather filter were used in the system.. Using the packet putting hydraulic pump and integrated valves block into the pre-pressure closure oil tank, improved the reliability of the oil supply of the closed loop and realized the system integration.On the MATLAB and AMESim simulation platform, built up the semi-physical and mathematical mode of the system contained initiative oil supply oil link, security link and leakage link. By simulating, analyzed the main system parameters'impact to dynamic performance. Proposed compound control scheme of feedback-plus-feed-forward and pressure closed-loop feed-forward, improved the system dynamic response characteristics. For the complex electromagnetic environment of system, designed anti-electromagnetic interference device. Authored control software, achieved system on-line debugging and control functions. Developed the sample machine of the system. Built test-bed of the system, tested and analyzed performance of sample machine, experiment results was given. By comparing analysis result and experiment results, we got that theoretical analysis is right.