【正文】 tem so that the whole system performance is improved. Key words: AT89C51 microcontroller。 關(guān)鍵詞 ： AT89C51 單片機； PWM調(diào)速； 正反轉(zhuǎn)控制；仿真。 采用帶中斷的獨立式鍵盤 作為命令的輸入，單片機在程序控制下，不斷給光電隔離電路發(fā)送 PWM 波形， H型驅(qū)動電路完成電機正反轉(zhuǎn)控制 .在設(shè)計中，采用 PWM 調(diào)速方式，通過改 變 PWM 的占空比從而改變電動機的電樞電壓，進而實現(xiàn)對電動機的調(diào)速。并實現(xiàn)電路的仿真。SelectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointselectionParagraaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesTSelectionParbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbagraphFoLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointse11111111111111111111111111111111lectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPoctionParagraphFormatLineSpaci2222222222222222222222ngLinesToPoints2SelectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointselectionParagraphFccccccccccccccccccccccccccccccccccccccccccccccccccccccccormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPoctionParagraSelec SelectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointselectionParagraaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesTSelectionParbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbagraphFoLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointse11111111111111111111111111111111lectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPoctionParagraphFormatLineSpaci2222222222222222222222ngLinesToPoints2SelectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointselectionParagraphFccccccccccccccccccccccccccccccccccccccccccccccccccccccccormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPoctionParagraSelec I 目錄 摘要 ......................................................................... II ABSTRACT ..................................................................III 1 系統(tǒng)論述 .................................................................. 5 設(shè)計思路 .............................................................. 5 基本原理 .............................................................. 5 總體設(shè)計框圖 ......................................................... 6 2 直流電 機單元電路設(shè)計與分析 ........................................... 6 直流電機驅(qū)動模塊 .................................................... 7 直流電機的中斷鍵盤控制模塊 ...................................... 14 2． 3 1602LCD 液晶 顯示模塊 ............................................. 17 3 直流電機 PWM 控制系統(tǒng)的實現(xiàn) .......................................... 20 總電路圖 ............................................................. 20 總電路功能介紹 ...................................................... 21 直流電機控制程序 ................................................... 21 4 系統(tǒng)仿真 ................................................................. 31 5 結(jié)束語 .................................................................... 34 參考文獻資料 .............................................................. 36 SelectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointselectionParagraaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesTSelectionParbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbagraphFoLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointse11111111111111111111111111111111lectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPoctionParagraphFormatLineSpaci2222222222222222222222ngLinesToPoints2SelectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointselectionParagraphFccccccccccccccccccccccccccccccccccccccccccccccccccccccccormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPoctionParagraSelec SelectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointselectionParagraaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesTSelectionParbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbagraphFoLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointse11111111111111111111111111111111lectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPoctionParagraphFormatLineSpaci2222222222222222222222ngLinesToPoints2SelectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointselectionParagraphFccccccccccccccccccccccccccccccccccccccccccccccccccccccccormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPoctionParagraSelec II 摘要 本文是對 直流電機 PWM 調(diào)速器設(shè)計 的研究，主要實現(xiàn)對電機的控制。本課程設(shè)計主要是實現(xiàn) PWM調(diào)速器的正轉(zhuǎn)、反轉(zhuǎn)、加速、減速、停止等操作。為實現(xiàn)系統(tǒng)的微機控制，在設(shè)計中，采用了 AT89C51 單片機作為整個控制系統(tǒng)的控制電路的核心部分，配以各種顯示、驅(qū)動模塊，實現(xiàn)對電動機轉(zhuǎn)速參數(shù)的顯示和測量； 由命令輸入模塊、 光電隔離模塊及 H 型驅(qū)動 模塊 組成。設(shè)計的整個控制系統(tǒng)，在硬件結(jié)構(gòu)上采用了大量的集成電路模塊，大大簡化了硬件電路，提高了系統(tǒng)的穩(wěn)定性和可靠性，使整個系統(tǒng)的性能得到提高。 SelectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointselectionParagraaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesTSelectionParbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbagraphFoLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointse11111111111111111111111111111111lectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPoctionParagraphFormatLineSpaci2222222222222222222222ngLinesToPoints2SelectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointselectionParagraphFccccccccccccccccccccccccccccccccccccccccccccccccccccccccormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLine