The Application of Servo Motor Direct Drive Pump Control System in Pre-Bending Machine

2014 ◽  
Vol 529 ◽  
pp. 544-548
Author(s):  
Huan Wang ◽  
Yi Min Xu
Keyword(s):  
Control System ◽  
Energy Saving ◽  
Hydraulic System ◽  
Closed Loop ◽  
Control Unit ◽  
Servo Motor ◽  
Direct Drive ◽  
Motor Speed ◽  
Reduce Energy Consumption ◽  
Drive Pump

Efficient and energy-saving are the development tendencies of the pre-bending machine. The new pre-bending machine is consisted of a constant pump driven by servo motor instead of common motor, variable pump and proportion valve. The advantage of this hydraulic system is energy-saving and it’s a closed-loop which controls the hydraulic system. In order to get different flow, it needs to adjust the servo motor speed by the control unit. This hydraulic system not only has a good performance, but also can significantly reduce energy consumption.

The Design of Rudder System Simulation Device

2014 ◽  
Vol 602-605 ◽  
pp. 1344-1347
Author(s):  
Zi Lin Zhang ◽  
Yang Liu ◽  
Dong Di Liu ◽  
Hong Bo Wang
Keyword(s):  
Control System ◽  
Hydraulic System ◽  
Closed Loop ◽  
System Simulation ◽  
Control Unit ◽  
Steering System ◽  
Control Mode ◽  
Electric Control ◽  
Ship Control ◽  
Operation Control

This paper designs a ship rudder system simulation device in order to serve the research of ship control better with the proportion of a real marine hydraulic rudder system, which can complete closed-loop experiments in the lab with the steering system. The rudder system simulation device mainly includes two parts, electric control system which uses PLC as core control unit, hydraulic system, and it can achieve both manual and automatic operation control mode.

Research into the Variable Speed Pump Control System for Driving the Cutter Head of Shield Tunneling Machine

2009 ◽  
Vol 628-629 ◽  
pp. 257-262 ◽  
Author(s):  
Tong Xing
Keyword(s):  
Control System ◽  
Hydraulic System ◽  
Closed Loop ◽  
Control Method ◽  
Control Technique ◽  
Closed Loop Control ◽  
Variable Speed ◽  
Shield Tunneling ◽  
Loop Control ◽  
Cutter Head

The cutter head drive hydraulic system of φ1.8m simulate shield machine is introduced in this article, which has the variable speed pump control technique and the closed loop control method. The AMESim simulation model of the hydraulic system is built up, and the efficiency of the hydraulic system, speed control performance by open loop and closed loop control are analyzed. The result of the simulation shows that the variable speed pump control system has higher efficiency than the variable displacement pump control system about 4%-26% in the same condition when the cutter head speed is at the range of 0.5-4r/min, and the hydraulic system has good dynamic characteristics in closed-loop PID control.

scholarly journals PD Plus Dynamic Pressure Feedback Control for a Direct Drive Stewart Manipulator

Energies ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1125 ◽  
Author(s):  
Chenyang Zhang
Keyword(s):  
Control System ◽  
Feedback Control ◽  
Dynamic Characteristics ◽  
Control Strategy ◽  
Dynamic Pressure ◽  
Control Input ◽  
Servo Motor ◽  
Direct Drive ◽  
Pressure Feedback ◽  
Current Coupling

In order to ensure good dynamic characteristics, servo valve is usually adopted as the drive part of Stewart manipulator which causes huge power consumption, while direct drive electro-hydraulic servo system has the advantages of energy saving, simple structure, convenient installation, and low failure rate. But its dynamic characteristics are so poor that it can only be applied to occasions where quick response is not needed. On the consideration above, following works are done in this paper. Since current coupling exists in the control system based on the speed of the servo motor as the control input, the control system of the direct drive Stewart manipulator is established based on the current of the servo motor as the control input in which the current coupling can be solved. In order to improve the dynamic characteristics of the direct drive Stewart manipulator, a Proportion Differentiation (PD) plus dynamic pressure feedback control strategy is also put forward in this paper, which is verified by using a simulated hydraulically driven Stewart manipulator. Simulation results show that both dynamic coupling and current coupling are solved and the control strategy proposed in this paper can significantly increase the bandwidths of all degrees of freedom.

Selection of Operating Modes of a Multi-Functional Hydraulic Device

2005 ◽  
Author(s):  
Amir Shenouda ◽  
Wayne J. Book
Keyword(s):  
Control System ◽  
Energy Saving ◽  
Hydraulic System ◽  
Force Feedback ◽  
New Technology ◽  
Hydraulic Cylinder ◽  
Hydraulic Control ◽  
Operating Modes ◽  
Machine Productivity ◽  
Spool Valve

The field of earth moving equipment is experiencing a transformation due to the introduction of more electronic control capability and advanced control concepts. Conventional hydraulic control systems are controlled by proportional directional spool valve. The construction of the spool valve is such that a given position of the spool determines the flow in and the flow out restriction sizes. Thus, metering in and metering out are dependent or coupled. A certain restriction size on the inlet corresponds to a certain restriction size on the outlet. Therefore, we have one degree of freedom. It can provide for good motion control but it cannot achieve energy saving potential at the same time. In this paper, the concept of ‘independent meter in / meter out’ will be emphasized. Decoupling of meter in from meter out provides for more controllability and potential for energy saving in overrunning load cases when compared with a conventional spool valve controlled hydraulic system. A four-valve configuration controlling a hydraulic cylinder will be stressed. The four-valve configuration can operate in several modes because each of the four valves is controlled separately from the others. Five of these metering modes will be pointed out; two conventional modes and three regenerative modes. An industry system supplier has introduced a novel distributed independent metering in/meter out hydraulic system with actuator force feedback. This control system is going to presented in brief. The distributed, actuator mounted implementation of this system maximizes the efficiency of the regeneration flow by minimizing the line losses associated with the recirculating fluid This control system can be used to control a multi-functional hydraulic device, e.g. excavators, tractor loader backhoes, etc... An experiment was done where a typical dig cycle was performed by a tractor loader backhoe equipped with this new technology. The data recorded from this experiment is used to perform an off-line optimization of metering modes selection for each function during the cycle. this off-line optimization can be used to maximize machine productivity or machine efficiency or a weighted combination of both. A general objective function will be presented and results will be given for maximizing machine productivity. Finally conclusions and future work suggestions are presented.

Design and Implementation of Servo Motor Speed Control System Based on STM32

2013 ◽  
Vol 427-429 ◽  
pp. 999-1002
Author(s):  
Jiang Yi Liu ◽  
Shu Ying Sun
Keyword(s):  
Control System ◽  
Pulse Width Modulation ◽  
Speed Control ◽  
Servo Motor ◽  
Motor Speed ◽  
Embedded Microprocessor ◽  
Speed Control System ◽  
Absolute Encoder ◽  
Expert Pid ◽  
Modulation Speed

A speed control servo system based on STM32 is designed in order to realize the rapid, accurate, smooth speed control of rotary table. the system uses embedded microprocessor STM32F103 as the core, using the absolute encoder as the position sensor.The system achieved control of motor speed by PWM (pulse width modulation).Speed and current double loops control is used,and the expert PID control is used as the control algorithm. Through the analysis of the experimental results can be seen that the system has good stability, and the static and dynamic indicators meet the design accuracy.This design basically has reached the requirement of the servo motor speed control system.

Design of Control System of Brushless DC Motor Based on DSP

2014 ◽  
Vol 496-500 ◽  
pp. 1417-1421 ◽  
Author(s):  
Li Na Duan ◽  
Jin Zhao
Keyword(s):  
Control System ◽  
Closed Loop ◽  
Brushless Dc Motor ◽  
Closed Loop Control ◽  
Signal System ◽  
Motor Speed ◽  
Loop Control ◽  
Brushless Dc ◽  
The Core ◽  
Control Segment

The System is at the core of TMS320F2812DSP from TI company to design the control system for BLDC motor, the control segment of it take advantage of the event manager EVA of the DSP to compare and produce six ways signal control.And utilize the capture module to acquire the state situation of the rotor-position sensor.Acording to the condition of hall sensor to control motor commutation.And solve the PWM signal system in the generation and motor speed feedback.It's easy to realize the motor closed-loop control, greatly simplify the system hardware design, improves the reliability of the system, reduces the volume of the system. Through the experiments,we gain the PWM waveform, and finally realize the purpose of reverse control .

Conceptual Design and Composition Principles Analysis of a Novel Collaborative Rectification Structure Pump

2014 ◽  
Vol 136 (5) ◽  
Author(s):  
Yang Li ◽  
Zongxia Jiao ◽  
Liang Yan ◽  
Wenhao Dong
Keyword(s):  
Control System ◽  
Flow Rate ◽  
The Novel ◽  
Direct Drive ◽  
Working Process ◽  
Pump System ◽  
System A ◽  
And Control ◽  
Active Rectification ◽  
Drive Pump

In order to provide a solution of active rectification for linear pumps in pump control system, a novel collaborative rectification structure is conceptually designed in this paper. The fundamental subsystem is the direct drive pump cell (DDPC). A DDPC consists of a cylinder and a valve, and the piston rod and the valve spool are integrated together. The DDPC could be driven by a linear oscillating motor directly. The DDPC working process is logically modeled as a state machine. Certain theorems are given and proved to illustrate the composition principles of a pump system with collaborative rectification. The kinematic flow rate of the collaborative rectification pump is studied. According to the comparison to the existing linear pumps, the novel pump has more structure compactness and control flexibility.

Application of Double Closed-Loop Control to the Steady-State Regulation and Control of Underwater Vehicle

2012 ◽  
Vol 443-444 ◽  
pp. 548-552
Author(s):  
Liang Liu ◽  
Yu Yi Zhai ◽  
Wen Jie Lu ◽  
Huan Xin Luo ◽  
Yu Li
Keyword(s):  
Control System ◽  
Closed Loop ◽  
Speed Control ◽  
Underwater Vehicle ◽  
State Regulation ◽  
Closed Loop Control ◽  
Motor Speed ◽  
Forward Movement ◽  
Underwater Robots ◽  
Loop Control

In this paper, the speed control system controlled by motor speed was designed to control forward speed of underwater robot precisely. Based on the theory of double closed-loop speed control, motor control system was modeled firstly, and then regulator parameters were designed based on the engineering approaches. According to the characteristics of forward movement, the mechanical construction of sub-mini underwater robots and the comparison of various system designs, the double closed-loop regulator parameters of sub-mini underwater robots were obtained. And the propulsion system of sub-mini underwater robots was equipped with speed and current double closed-loop control. All the experimental results showed that within a certain range of motor speed, no static error could be guaranteed and the variable speed of underwater vehicle could be achieved.

Design and Simulation of the Hydraulic Synchronous Control System of the Upper Roller in Bending Machine

2015 ◽  
Vol 713-715 ◽  
pp. 752-755
Author(s):  
Yang Cao ◽  
Kai Wen Qiu ◽  
Guo Qing Wu ◽  
Rong Chuan Yu ◽  
Chao Chao Zhong
Keyword(s):  
Control System ◽  
Hydraulic System ◽  
Closed Loop ◽  
System Simulation ◽  
Open Loop ◽  
Closed Loop System ◽  
Synchronous Control ◽  
Pid Algorithm ◽  
Synchronous System ◽  
Hydraulic Cylinders

This paper sketches the overall structure of the hydraulic system of bending machine, and designs the hydraulic synchronous control system of the upper roller in bending machine. Then making use of AMEsim software to establish hydraulic system simulation model to analyze the pressure, velocity, displacement and other parameters of hydraulic cylinders in two cases when in open loop and closed loop system. After that, use PID algorithm to simulate the upper roller of bending machine in hydraulic closed loop synchronous system, which verifies that it can meet the motion requirements and get a higher synchronous precision.

Sign in / Sign up

Export Citation Format

Share Document