Research On Belt Transmission Control System Based On Brushless DC Motor

Belt conveyor control systems have an irreplaceable role in transporting items.Not only can it transport items,but it can also be combined with many production processes,such as machine vision technology,to achieve a complete line button reject system.The stability of the belt conveyor control system's running speed indirectly affects the accuracy of button rejects,so stability studies of its speed are required.At present,the commonly used belt conveyor control system is mainly used in high speed and large load,but it is expensive and complicated.Therefore,it is very necessary to design a belt transmission control system with low speed,short distance and high speed control precision for eliminating button defects based on machine vision technology.This thesis takes the belt transmission control system as the research object,and systematically analyzes and studies the problems of slippage and stall in the belt transmission control system.Design and debug the hardware and software of the system.The research content mainly includes system dynamics model,mathematical model,intelligent control algorithm,mechanical design,power electronics technology and embedded system programming.The main contents of this thesis include:1.For the problems of slip and stall which may occur during the movement of the belt conveyor control system,establish its dynamic model and the mathematical model of the brushless DC motor of the driving device,which can better reflect the model of the actual system.2.Research and improve the motion control algorithm of the belt transmission control system.The traditional PID control algorithm alone can not meet the requirements of the system control accuracy.Therefore,this thesis combines fuzzy control,genetic algorithm and PID control to obtain better results,and avoid the problem that the system may stall during the actual operation.3.Perform geometric analysis on the belt conveyor control system and design a belt conveyor control system for rejecting button defects according to the mechanical design manual.The brushless DC motor model is selected according to the design parameters,and its simulation model is built according to its mathematical model.Finally,the traditional PID control,fuzzy PIDcontrol and genetic algorithm optimization PID control are applied to the simulation model.The results show that the genetic algorithm optimization PID control has the best control effect on the system.4.Using Altium Designer software to complete the design of the hardware circuit of the belt transmission control system,including the power conversion circuit,drive circuit and so on required by the system.The software part is mainly the design of main program and interrupt subroutine.Under the Keil uvision5 software development platform,the related flow chart program is written,and the genetic algorithm optimization PID control program is embedded in the system.Finally,the Chinese characters to be displayed on the OLED screen are extracted in the software PctoLCD2002 and then programmed into the program.5.Complete the mutual construction between the brushless DC motor,the coupling,the roller,the green PVC belt,and the like.The oscilloscope is used to measure the relevant waveforms of the belt conveyor control system during operation,and to observe and record the changes in the various operating parameters displayed on the OLED screen.Finally,through the experimental results and analysis data of the system operation,the belt transmission control system designed in this thesis has a relatively small range of speed fluctuation during operation,which is similar to uniform motion.Therefore,within the reasonable error range,it can meet the requirements of machine vision inspection technology.