Design On Rotational Speed Of Reel Automatic Control System

The reel of traditional combine are maily adjusted by way of manual tap position and the hydrantlic stepless derailleur to make out.So its complex structure,too much drive series,and poor working environment resulted in many problems.such as:delay transmission,unreliable work,loss power and so on.The complicts are becoming more and more perminently now.To meet the requirement of the reel.the paper designed an operating simply,transmitting reliably, real-time automantic system by use of microcomputer-controlling-frequency technology and automatic theory.This paper compared advantages and disadvantages of each velocitymodulation method has established the GTR crystalthyratron electric circuit which the system used,and established a microcontroller controlling converter from AC to AC,frequency converter driving motor automatic system for overall program.Also,introduced the principle of trigger control system,the way of circulation and the theory of consine intersection. Analyzed the process of the reel,established a mathematical model,then selected a mouse-cage type three-phase asynchronous motor on basis of this,completed the overall design.According to the founctional requirement of the automatic system,the paper designed with a focus on core hardware as follow:the topology of main circuit,the design of frenquency converter power included the main circuit of power,the protection circuit,control circuit,analogy input circuit,isolation circuit,synchronous circuit,display circuit controlled by micro computer and so on.Designed modular program software by use of assembly are as follow:the main program,the precesure of software timer 0 interrupt service,the subroutine of proportional- integrated rectifier,the subroutine of T1 overflow interrupt service,the subroutine of feedback current coefficient and so on.Then,established the pulse sequence tables under the voltage from"0"to"F"and the first address of time constant table.To obtain reliable parameters of the circuit components and guarantee its performance target ,the paper used simulink tool in the MATLAB system to carry out the simulation for the entire system,and designed a simple test,achieved the desired results.