【正文】 motor according to different conditions, run at a different speed. With the continuous development of science and technology, microelectronic technology, puter technology and automatic control technology has been rapid development of the PLC, inverter and electrical control system is more widely applied in industry. In practical engineering applications, often according to the needs of the project, with the PLC programming to implement plex control, the inverter frequency control and soft start control, electrical control system to achieve the main circuit connection, the three systems should closely cooperate to achieve the control requirements. The design will be on the basis of the PLC electric control system with frequency control devices, the use of advanced vector control technology to achieve to enhance the speed of the motor at different times and stages. KEYWORDS: PLC,inverter,threephase ac asynchronous motor安徽理工大學(xué)畢業(yè)設(shè)計 i 目錄 摘要 ........................................................................................................................................ I ABSTRACT .......................................................................................................................... II 1 緒論 .................................................................................................................................... 1 引言 .............................................................................................................................. 1 PLC 控制的交流電 動機(jī)變頻調(diào)速系統(tǒng)簡述 .............................................................. 1 PLC 控制的交流電動機(jī)變頻調(diào)速系統(tǒng)的發(fā)展與現(xiàn)狀 .............................................. 2 PLC 與電氣控制的結(jié)合運用 ..................................................................................... 2 PLC 與電氣控制相結(jié)合的優(yōu)點 ........................................................................... 3 PLC 與電氣控制發(fā)展的方向 ............................................................................... 3 課題研究設(shè)計的目的和意義 ...................................................................................... 6 2 PLC 的基礎(chǔ)知識 ................................................................................................................ 8 PLC 的概述 ................................................................................................................. 8 PLC 的定義 ........................................................................................................... 8 PLC 的特點 ........................................................................................................... 9 PLC 的基本構(gòu)成 ....................................................................................................... 10 中央處理模塊 ..................................................................................................... 10 存儲器模塊 ......................................................................................................... 11 輸入 /輸出（ I/O）模塊 ....................................................................................... 11 電源模塊 ............................................................................................................. 12 外部設(shè)備 ............................................................................................................. 13 PLC 的工作原理 ....................................................................................................... 13 PLC 的循環(huán)掃描的工作方式 ............................................................................. 13 3 三相交流異步電動機(jī)的基本原理 .................................................................................. 16 三相交流異步電動機(jī)的結(jié)構(gòu) .................................................................................... 16 三相交流異步電動機(jī)工作原理 ................................................................................ 16 旋轉(zhuǎn)磁場的產(chǎn)生 ................................................................................................. 16 三相異步電動機(jī)的轉(zhuǎn)差率 ................................................................................. 18 三相交流異步電動機(jī)控制電路 ................................................................................ 19 三相異步電動機(jī)啟動控制 ................................................................................. 19 三相異步電動機(jī)正反轉(zhuǎn)控制 ............................................................................. 21 三相異步電動機(jī)制動控制 ................................................................................. 21 三相異步電動機(jī)變頻調(diào)速和變頻器控制 ......................................................... 22 安徽理工大學(xué)畢業(yè)設(shè)計 ii 4 提 升電機(jī)系統(tǒng)模型的設(shè)計 .............................................................................................. 24 提升電機(jī)對電氣控制系統(tǒng)的要求 ............................................................................ 24 提升電機(jī)模型基于 PLC 電機(jī)調(diào)速控制系統(tǒng)方案設(shè)計 .......................................... 25 系統(tǒng)總體設(shè)計方案 .................................................................................................... 26 選擇機(jī)型 ............................................................................................................. 26 系統(tǒng)控制結(jié)構(gòu) ..................................................................................................... 26 系統(tǒng)接線圖 ......................................................................................................... 26 控制系統(tǒng) I/O 點 .................................................................................................. 28 設(shè)計步驟 .................................................................................................................... 28 系統(tǒng)流程框圖 ............................................................................................................ 28 系統(tǒng)硬件部分設(shè)計 .................................................................................................... 29 變頻器參數(shù)設(shè)置表 ............................................................................................. 29 輸出規(guī)格及標(biāo)度變換 ......................................