王增强三相异步电动机软启动

三相异步电动机软启动器的设计1附件2理工学院本科毕业设计（论文）三相异步电动机软启动器的设计Designofsotf-starterinthree-phaseasynchronousmotor学院（系）：电子系专业：电气工程及其自动化学生姓名：王增强学号：097408064指导教师（职称）：张凤蕊（教授）评阅教师：完成日期：理工学院NanyangInstituteofTechnology三相异步电动机软启动器的设计2三相异步电动机软启动器的设计电气工程及其自动化王增强［摘要］该系统是基于C8051单片机的交流异步电动机的软启动器控制系统，电机启动方式采用电压斜坡软启动，由单片机控制晶闸管触发脉冲。其次介绍了软启动器硬件电路的设计，包括主电路、控制电路、电流检测电路、相序检测电路、晶闸管触发及其驱动电路等，同时介绍了控制系统软件设计，包括主程序、电压斜坡启动程序、相序检测程序等，为了保护电机系统还设计了过压、欠压、过流等多种保护。［关键词］软启动器；异步电动机；单片机;晶闸管Designofsotf-starterinthree-phaseasynchronousmotorElectricalengineeringandautomationMajorWANGzeng－qiangAbstract:sotf-starterhasawiderangeofapplicationinmotorcontrolsystembecauseitsadvangtageofstartbrakeandenergy-savinginmotorsystem.Fistlythispaperintroducedthestructureandtheoperationprincipleofamotorsotf-starter.Thispaperdesignedasotf-startercontrolsysteminthree-phaseACasynchronousmotor,whichisbasedon8051singlechip,thecrystalthyratrontriggerpluseiscontroledbysinglechip.thesolpevoltagestartingofstartingmodeisusedtostartthemotor.secondly,thehardwaredesignandanalysisoftheintroduced,includingthemaincircuit,controlcircuit,detectcurrentcircuit,theelectriccurrentexaminationcircuit,phasesequencedetectioncircuit,thespringanddrivingofcrystalthyratron.Anddiseussedthesoftwaredesignofcontrolsystem,includingmainprogram,thesolpevoltageprogram,sequencedetectionprogram.Toprotcetthesystem,itprovideover-voltage,over-current,under-voltageprotectionmeasures.Keywords:sotf-starter;asynchronousmotor;singlechip;crystalthyratron三相异步电动机软启动器的设计3目录1前言........................................................................................................................................41.1三相异步电动机软启动器的国内外研究现状.......................................................41.2设计内容和要求.......................................................................................................51.3系统设计可行性分析...............................................................................................52软启动器原理......................................................................................................................62.1软启动器及其工作原理...........................................................................................62.2软启动器启动方式...................................................................................................62.4软启动器的四种停机方式.......................................................................................82.4软启动器的接线方案...............................................................................................83软启动器硬件电路设计......................................................................................................93.1软启动器硬件电路总体框图...................................................................................93.2软启动器主电路的设计...........................................................................................93.3软启动器控制电路的设计.......................................................................................113.3.1软启动器键盘及LCD显示电路的设计........................................................113.3.3软启动器同步电路设计................................................................................123.3.4软启动器晶闸管触发驱动电路设计............................................................133.3.5软启动器相序检测电路设计........................................................................143.3.6软启动器电流检测电路设计........................................................................153.3.7软启动器电机转速检测电路设计................................................................163.3.8软启动器电机线电压检测电路设计............................................................163.3.9软启动器电机功率因数检测电路设计........................................................173.3.10软启动器晶闸管导通角检测电路设计......................................................184软启动器软件设计............................................................................................................184.1系统主程序流程图.................................................................................................184.2软启动器键盘程序设计.........................................................................................194.3软启动器LCD显示程序设计...................................................................................204.4软启动相序检测程序设计.....................................................................................214.5软启动器同步信号程序设计.................................................................................224.6软启动器电压斜坡启动程序设计.........................................................................224.7软启动器触发脉冲延时程序设计.........................................................................234.7.1对晶闸管门极触发的要求..........................................................................234.7.2触发脉冲延时触发的次序..........................................................................23结束语......................................................................................................................................25参考文献..................................................................................................................................26三相异步电动机软启动器的设计41前言1.1三相异步电动机软启动器的国内外研究现状电力电子软起动的出现是随着晶闸管的出现而发展起来的，最早