【正文】 ...........................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(dòng)化裝備、辦公自動(dòng)化設(shè)備中有著廣泛的應(yīng)用。開環(huán)時(shí)，其平穩(wěn)性好，成本低，設(shè)計(jì)簡(jiǎn)單，但未能實(shí)現(xiàn)高精度細(xì)分。控制系統(tǒng)采用 PLC 來(lái)產(chǎn)生控制脈沖。但由于 PLC 的掃描周期一般為但由于 PLC 的掃描周期一般為幾毫秒到幾十毫秒，相應(yīng)的頻率只能達(dá)到幾百赫茲，因此，受到 PLC 工作方式的限制及其掃描周期的影響，步進(jìn)電機(jī)不能在高頻下工作，無(wú)法實(shí)現(xiàn)高速控制。用軟件代替環(huán)形分配器，通過對(duì)單片機(jī)的設(shè)定，用同一種電路實(shí)現(xiàn)了多相步進(jìn)電機(jī)的控制和驅(qū)動(dòng)，大大提高了接口電路的靈活性和通用性 。在步進(jìn)電機(jī)幾十年的發(fā)展過程中，按照相數(shù)、步距角以及機(jī)座等劃分，可以說(shuō)出現(xiàn)過的步進(jìn)電機(jī)的規(guī)格品種極其繁多，然而這種狀態(tài)不利于步進(jìn)電機(jī)產(chǎn)業(yè)的 發(fā)展，隨著時(shí)間的推移目前逐步形成了相應(yīng)的主流產(chǎn)品，在西方可以明顯看出最大量應(yīng)用的是定子 8 極轉(zhuǎn)子 50 齒的二相混合式步進(jìn)電動(dòng)機(jī)，其次是定子10 極轉(zhuǎn)子 50 齒的五相混合式步進(jìn)電動(dòng)機(jī)。以下是這幾種驅(qū)動(dòng)方式的比較。 高低壓驅(qū)動(dòng) 為了使通電時(shí)繞組能迅速到達(dá)設(shè)定電流，關(guān)斷時(shí)繞組電流迅速衰減為零，同時(shí)又具有較高的效率，出現(xiàn)了高低壓驅(qū)動(dòng)方式。 [8] 它激式恒電流斬波驅(qū)動(dòng) 為了解決自激式斬波頻率可變引起的浪涌電壓?jiǎn)栴}，可在 D 觸發(fā)器加一個(gè)固定頻率的時(shí)鐘。），這個(gè)步距角可以