PWM控制直流调速系统毕业设计

题目PWM控制直流调速系统设计院系：西南交通大学网络教育学院专业：电气工程及其自动化姓名：陈兆坤指导教师：郭蕾西南交通大学网络教育学院院系西南交通大学网络教育学院专业电气工程及其自动化年级2008-15班学号08821748姓名陈兆坤学习中心山东纺织学习中心指导教师郭蕾题目PWM控制直流调速系统设计指导教师评语是否同意答辩过程分(满分20)指导教师(签章)评阅人评语评阅人(签章)成绩答辩组组长(签章)年月日毕业设计任务书班级2008-15班学生姓名陈兆坤学号08821748发题日期：年月日完成日期：年月日题目PWM控制直流调速系统设计题目类型：工程设计技术专题研究√理论研究软硬件产品开发一、设计任务及要求1：直流调速系统的设计技术指标。2：PWM控制直流系统电路设计。3：PWM系统实验验证。二、应完成的硬件或软件实验PWM控制直流调速系统测定直流电动机的各项参数和时间参数，并应用经典控制理论的工程设计方法设计转速和电流双闭环直流调速系统。以SG3525为核心实现PWM脉冲调速，形成无静差的转速电流双闭环控制。三、应交出的设计文件及实物（包括设计论文、程序清单或磁盘、实验装置或产品等）毕业设计、毕业论文。四、设计进度安排第一部分搜集资料，整理实际工作中一些经验。（2周）第二部分整理成理论片断。（4周）第三部分成文。（6周）评阅及答辩（周）指导教师：年月日学院审查意见：审批人：年月日诚信承诺一、本设计是本人独立完成；二、本设计没有任何抄袭行为；三、若有不实，一经查出，请答辩委员会取消本人答辩资格。承诺人（钢笔填写）：年月日目录摘要····································································8Abstract··································································9前言·····································································10第1章直流调速系统的方案设计············································111.1设计技术指标要求···················································111.2现行方案的讨论与比较···············································111.3选择PWM控制调速系统的理由·······································131.4选择IGBT的H桥型主电路的理由·····································131.5采用转速、电流双闭环的理由·······································14第2章PWM控制直流调速系统主电路设计··································152.1主电路结构设计·····················································152.1.1PWM变换器介绍···························································152.1.2泵升电路·································································212.2参数设计···································································222.2.1IGBT的参数······························································222.2.2缓冲电路参数····························································232.2.3泵升电路参数····························································23第3章PWM控制直流调速系统控制电路设计·································243.1PWM信号发生器···························································243.1.1SG3525芯片的主要特点·············································243.1.2SG3525引脚各端子功能·············································253.1.3SG3525的工作原理·················································263.2转速、电流双闭环设计················································273.2.1转速、电流双闭环系统的组成·······································273.2.2转速、电流双闭环调速系统的静特性··································283.2.3电流调节器设计···················································313.2.4速度调节器设计···················································33第4章系统实验验证······················································354.1系统结框图·························································354.2系统工作原理·······················································354.3系统单元调试·······················································364.3.1基本调试·························································364.3.2脉宽发生单元的整定···············································364.3.3转速反馈调节器、电流反馈调节器的整定······························364.4实验结果···························································374.4.1开环机械特性测试·················································374.4.2闭环机械特性测试·················································37结束语···································································39致谢·································································40参考文献·································································41PWM控制直流调速系统设计摘要在电气时代的今天，电动机在工农业生产、人们日常生活中起着十分重要的作用。直流电机是最常见的一种电机，在各领域中得到广泛应用。研究直流电机的控制和测量方法，对提高控制精度和响应速度、节约能源等都具有重要意义。电机调速问题一直是自动化领域比较重要的问题之一。不同领域对于电机的调速性能有着不同的要求，因此，不同的调速方法有着不同的应用场合。本文基于PWM的双闭环直流调速系统进行了研究，并设计出应用于直流电动机的双闭环直流调速系统。首先描述了变频器的发展历程，提出了PWM调速方法的优势，指出了未来PWM调速方法的发展前景，点出了研究PWM调速方法的意义。应用于直流电机的调速方式很多，其中以PWM变频调速方式应用最为广泛，而PWM变频器中，H型PWM变频器性能尤为突出，作为本次设计的基础理论，本文将对PWM的理论进行详细论述。在此基础上，本文将做出SG3525单片机控制的H型PWM变频调速系统的整体设计，然后对各个部分分别进行论证，力图在每个组成单元上都达到最好的系统性能。关键词：直流调速；双闭环；PWM；SG3525；直流电机DC-drivespeedsystemwithPWMABSTRACTInelectricaltime'stoday,theelectricmotorintheindustryandagricultureproduction,thepeopledailylifeisplayingtheveryvitalrole.Thedirectcurrentmachineisthemostcommononekindofelectricalmachinery,obtainsthewidespreadapplicationinvariousdomains.Theresearchdirectcurrentmachine'scontrolandthemeasuringtechnique,toincreasethecontrolprecisionandthespeedofresponse,thefrugalenergyandsoonhavetheimportantmeaning.Aproblemaboutspeed-modulationofDCmotorisveryimportantinthefieldautomatic.Therequeststotheeffectafterthespeed-modulationoftheDCmotoraredifferentindifferentfields.Then,differentspeed-modulationwaysareusingindifferentfields.ThispaperresearchesDC-drivespeedsystemwithadual-converteranddual-closed-loopbasedPWM,discussinganewcontrolmethodthatcombinesPWMwithDC-drive,designsappliesindirectcurrentmotor'sdoubleclosedloopcurrentvelocitymodulationsystem.DCmotorisusedverygenerallybecauseitsspeed-modulationeffectisverygoodanditsspeed-modulationiseasilytoberealized.PWMtheoryisusedmostgenerallyamongthespeed-modulationways.ThetextwillintroducetheH-PWMwaymostly.WewilltrytodomodulationtotheDCmotorwithSG3525.Theimportanceofthetextisthepartswhicharecomposedthesystem.Anotherimportanceisthe