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Design Of Embedded Controller For High Speed Dispensing

Posted on:2019-09-27Degree:MasterType:Thesis
Country:ChinaCandidate:Y H JiaFull Text:PDF
GTID:2428330566498893Subject:Electrical engineering
Abstract/Summary:PDF Full Text Request
Dispensing technology is a key process for the surface-mount technology(SMT).The aim of this technology is to a certain amount of microscale fluid(glue,paint,or other liquid)with a specific form drips,perfusion or coated on the surface of the electronic components and circuit board or inside the chip by accurately controlled way according to the predetermined trajectory.To realize the encapsulation and adhesive or coating components,the insulation of the product,such as protection from external shocks,moistureproof,prevent salt fog protection,are needed to improve product reliability and service life.In the chip packaging and electronic product SMT industry,product quality is directly influenced by quality of dispensing technology.With the development of automation and the machine vision technology,automatic dispensing machine arises and gradually replaces the traditional manual dispensing and semi-automatic dispensing operations.As the control core of automatic dispensing machine,dispensing machine motion controller is the key factor of the dispensing motion control and implementation of high quality glue.Dispensing machine motion controller is not only determines the accuracy and speed of the glue work,but also determines the reliability of the machine.Therefore,automatic dispensing machine performance improvement is the key to improve the performance of the motion controller.Based on the above research and analysis,it is known that research and development of high performance dispensing machine dedicated motion controller can effectively improve the quality of the automatic dispensing machine products,and reduce costs.For the development of dispensing machine industry,the investigation on the dispensing machine system has a certain scientific significance and the very strong practical value.Therefore,on the basis of investigation and analysis of the dispensing machine motion control system,the main aim of this paper is to develop the interpolation algorithm based on feedback and to design the sliding mode variable structure control for the motion control system.In addition,multi-core processors dispensing machine movement control system platform is constructed based on ARM + FPGA.The main contents are as follows:First chapter fully researches the present situation of dispensing machine motion control system,and summarizes the research status of interpolation and velocity planning algorithm,analyses the existing motion control algorithms.On the basis of summarized previous works in the first chapter,a class of interpolation algorithm with recursive structure is studied.First,in view of the nonparametric curve and parametric curves,two kinds of simple recursive interpolation algorithms are investigated respectively.Moreover,the advantages and disadvantages of these algorithms are analyzed.Secondly,a class of interpolation algorithm with feedback correction is investigated.For the nonparametric curve and parametric curves,two interpolation algorithms with feedback correction are presented.Finally,the applicability of the algorithm in engineering is analyzed,and the direction of the algorithm is given.The third chapter studies the motion controller design of the motion control system of dispensing machine.The model of the dispensing machine motion control system is constructed.Based on this model,a new kind of sliding mode variable structure controller is designed.The main feature of the proposed controller is the concept of variable boundary layer design is introduced to eliminate the chattering of sliding mode variable structure control.Finally,the numerical example is given to show the effectiveness of the proposed controller.The fourth chapter of this paper designs the complete scheme of the motion control system of the dispensing machine.Based on ARM + FPGA the motion controller hardware platform is constructed.Further,the system software for the ARM main processor and FPGA coprocessor is designed.In the last chapter,on the basis of the constructed platform,the effectiveness of the designed interpolation algorithm and the motion controller are verified by using some simulation examples.
Keywords/Search Tags:Motion control system, Variable boundary layer, Sliding mode control, Recursive interpolation algorithm
PDF Full Text Request
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