High-performance injection molding machine key technologies

　　Title: High-performance injection molding machine key technologies
　　Author: Song Chunhua
　　Degree-granting units: Southwest Jiaotong University
　　Keywords: permanent magnet synchronous servo motor;; energy;; variable piston pump;; fuzzy control;; internal model control;; noise
　　Abstract:
　　The 21st century is the century of science and technology, materials technology with the servo motor's performance has been greatly improved for high-speed injection molding machines, high-precision possible. Advanced control technology to further develop and improve, to achieve electrical connection of the injection molding machine and pump drive servo control system provides a theoretical basis. Microcontrollers, especially the improvement of chip Neodymium Magnets technology and the emergence of dedicated DSP control technology for the algorithm implementation possible.
　　Energy-saving, high-speed, high precision, low noise high-performance injection molding machine control system development. However, high speed and high precision, low noise are often two conflicting directions. Control method to solve the energy optimization and high-speed, high precision of great significance, it is necessary to control the injection molding machine to study. Energy-saving injection molding machine hydraulic system, the flow is from the past and the pressure ratio of the proportion of dual control to load sensitive adaptive control, to the frequency control, servo control and servo-loop control. High-power energy-saving high-performance injection molding machine drive system is indispensable to the system.
　　In response to these problems, this paper first fuzzy prediction method of injection molding machine drive motor - induction motor speed control has been studied; Secondly, the use of internal model control method of injection molding machine drive motor - permanent magnet synchronous servo motor current regulator in-depth study; Third, the fuzzy control variable pump for motor coordination and control; Fourth, for high speed, high precision and low noise conflict between the different between the motor and variable displacement piston conducted a study of the connection; the final analysis, the variable pump injection molding machine servo motor drive system and the principle of energy conservation and energy-saving valve system were compared.
　　Thesis contains the following aspects:
　　1) induction motor speed controller design. In the induction motor control, resistance, reactance, and other parameters of the speed control have a greater error, thereby affecting the speed control accuracy and dynamic response. Induction motor based on a mathematical model to predict the introduction of fuzzy logic control system. Strong coupling for the induction motor characteristics, the method proposed fuzzy predictive control, and fuzzy predictive control http://www.everbeenmagnet.com/en/products/110-sintered-neodymium-magnets method to design high-performance speed controller.
　　2) based on field-oriented control principle, the permanent magnet synchronous motor current regulator internal model control (IMC) design. In the permanent magnet synchronous servo motor vector control, the motor speed range is very wide, the resistance, reactance, and other parameters of the d, q axis current control have a greater error, thereby affecting the speed control accuracy and dynamic response. Matrix singular value analysis of IMC robust current controller, and applied to permanent magnet synchronous motor rotor field oriented vector control. Of the current regulator transfer function of the simulation and the DSP to run the motor vector control experiments, experiments show that the current regulator with the IMC to achieve motor speed, can get a good steady-state tracking performance and high accuracy to improve ability to control the motor and verify that the current regulator in the IMC wide speed-dependent motor parameters when a small good performance.
　　3) From the fuzzy control theory, put forward a fuzzy control method for servo motor control and coordination of the variable pump. Solve the injection molding machine when the low frequency control characteristics of poor, slow dynamic response, speed is not easy to ensure the accuracy and other issues. Coordination with fuzzy internal model control method to solve the problem of speed fluctuation.
　　4) For high speed, high precision and low noise conflict between the motor and variable displacement piston connection between the way the study. Shows the coupling of the servo motor pump system response and noise have a significant impact.
　　5) analysis of the servo motor plus variable pump system energy efficiency principles, through experiments on the servo motor and pump system increases the proportion of variable valve systems were compared.
　　Degree Year: 2009