【正文】 ........................46 系統(tǒng)鍵盤流程圖 ..................................................................47 待機(jī)狀態(tài)下鍵盤操作流程 ..........................................47 連續(xù)運(yùn)行模式狀態(tài)下鍵盤操作流程 ...........................49 第 6 章 總結(jié) .................................................................................... 52 V 結(jié)論 .....................................................................................52 參考文獻(xiàn) ......................................................................................... 54 致謝 ................................................................................................. 56 附錄 1:部分系統(tǒng)程序清單 ............................................................... 57 附錄 2:系統(tǒng)圖 ...................................................................................59 V CONTENTS ABS TRACT ........................................................................................I ABS TRACT ...................................................................................... II Chapte r1 introduction ...................................................................... 1 preface ................................................................................... 1 Electronic circuit control method based on ................... 1 By means of control based on P LC\/ inverter ................ 2 Based on MC U control.................................................. 3 domestic and foreign development ......................................... 4 stepper motor drive mode classification and parison of .... 6 single voltage drive ...................................................... 6 high and low voltage drive ........................................... 7 self excited constant current chopper drive ................... 8 excitation type constant current chopper drive .............. 8 subdivis ion drive .......................................................... 9 the purpose and significance of the study ..............................10 The paper.............................................................................. 11 Chapte r2 outlines the ste p motor ....................................................13 stepper motor features ...........................................................13 stepper motor classification ..................................................14 reaction stepping motor ...............................................14 permanent mag stepper motor..................................14 The hybrid stepping motor ...........................................14 The step operation of the principle of stepping motor on .......15 Chapte r 3 ste ppe r motor control syste m ove rvie w ........................17 stepper motor control system.................................................17 The characteristics and function of the system ......................20 C haracteristics of the system .......................................20 system functions..........................................................21 Chapter 4 hardware system design ..................................................22 VI system ..................................................................................22 system AT89C51MC U core ...................................................22 The main characteristics of ..........................................23 The pin ........................................................................23 Oscillator characteristics .............................................25 chip erase ....................................................................25 minimum system..........................................................26 The peripheral circuit design .................................................27 display circuit LC D1602 ...........................................27 keyboard circuit ..........................................................34 watchdog reset circuit..................................................36 The drive circuit of L298N .........................................38 power supply circuit ....................................................41 Chapte r5 syste m software design ....................................................43 system software flowchart of.................................................43 system initialization process in F igure ..................................44 The step motor running module flowchart .............................45 system shows the process in F igure .......................................46 standby keyboard operation process .............................47 continuous operation mode the keyboard operation process.................................................................................49 Chapte r6 s ummarizes ......................................................................52 conclusions ...........................................................................52 Reference .........................................................................................54 Thanks .............................................................................................56 Appe ndix 1:syste m program in listing .............................................57 Appe ndix 2:syste m diagram.............................................................59 1 第 1 章 緒論 前言 步進(jìn)電機(jī)在工業(yè)自動化裝備、辦公自動化設(shè)備中有著廣泛的應(yīng)用。近年來，控制技術(shù)、計(jì)算機(jī)技術(shù)及微電子技術(shù)的迅速發(fā)展，有力地推動了步進(jìn)電機(jī)控制技術(shù)的進(jìn)步，提高了步進(jìn)電機(jī)運(yùn)動控制裝置的應(yīng)用水平。 步進(jìn)電機(jī)的控制系統(tǒng)多種多樣，但究其控制手段而言，主要可以分為以下幾種 : 基于電子電路控制手段 在一些控制應(yīng)用不高的場合，采用簡單數(shù)字定時(shí)集成芯片為步進(jìn)電機(jī)提供脈沖控制信號，步進(jìn)電機(jī)受電脈沖信號控制，電脈沖信號的產(chǎn)生、分配、放大全靠電子元器件的動作來實(shí)現(xiàn)。由于脈沖控制信號的驅(qū)動能力一般都很弱，因此必須有功率放大驅(qū)動電路。步進(jìn)電機(jī)與控制電路、功率放大驅(qū)動電路組成一體，構(gòu)成步進(jìn)電機(jī)驅(qū)動系統(tǒng)。此種控制電路設(shè)計(jì)簡單，功能強(qiáng)大，可實(shí)現(xiàn)一般步進(jìn)電機(jī)的細(xì)分任務(wù)。這個系統(tǒng)由三部分組成 :脈沖信號產(chǎn)生電路、脈沖信號分配電路、功率放大驅(qū)動電路。 [1] 此種方案即可為開環(huán)控制，也可閉環(huán)控制。開環(huán)時(shí)，其平穩(wěn)性好，成本低，設(shè)計(jì)簡單，但未能實(shí)現(xiàn)高精度細(xì)分。采用閉環(huán)控制，即能實(shí)現(xiàn)高精度細(xì)分，實(shí)現(xiàn)無級調(diào)速。