绕线式异步电动机调速论文

摘要绕线式异步电动机的串级调速系统，属于改变转差功率的调速系统，在我国交流调速技术的发展中，它是结构简单、发展较快、应用较广的一种系统。其基本原理是利用不可控的整流电路将转子交流电动势转成直流电动势，在利用工作的在逆变状态的三相可控整流电路来获得一个可调的直流电压作为附加电动势，以改变转差功率，以实现转速的调节。本设计主要是绕线式异步电动机的串级调速系统主电路和触发电路的设计。其中主电路的设计包括可控整流电路、不可控整流电路和逆变变压器；触发电路主要包括KC系列的移相触发电路和ULN2003。考虑到系统运行时可能出现的问题，相应的设计了系统的保护电路。关键词：串级调速、整流电路、触发电路。AbstractAsynchronousmotorcascadespeedsystem,belongingtopoorpowertochangethegoverningsystem,InChinaACdevelopment,itissimpleinstructure,thedevelopmentoffaster,broaderapplicationofasystem.ItsbasictenetsarenotcontrollableusingdistillationrotorcircuittoexchangeelectromotiveforceelectromotiveforceDCconversion,intheuseofthestate'sthree-phaseinvertercontrolledrectifiercircuittoobtainanadjustableDCvoltageasadditionalelectromotiveforce,tochangethedeterioratingpower,toachievethespeedofadjustment.ThedesignisasynchronousmotorspeedcontrolsystemCascademaincircuitandacontrolcircuitdesign.Includingthemaincircuit,thedesignincludescontrollablerectifiercircuit,controlledrectifierandinvertercircuittransformer;ControlcircuitdesignismainlyElectricityRegulatorspeedregulatorandthedouble-loopcontrolsystem.Takeintoaccountwhenthesystemproblemsthatmayariseinthecorrespondingdesignofthesystemprotectioncircuit.Keywords:cascadespeed;Rectifiercircuit；TriggerCircuitI目录引言......................................................................................................................................................1第一章串级调速系统的基本原理.................................................................................................31.1串级调速系统的工作原理..................................................................................................31.2异步电动机串级调速的机械特性......................................................................................41.3设计的技术参数..................................................................................................................51.4设计任务..............................................................................................................................5第二章主电路的设计.......................................................................................................................52.1主电路的设计原则..............................................................................................................52.1.1设计思路.................................................................................................................52.1.2设计依据.................................................................................................................62.2逆变变压器的计算与选择..................................................................................................62.2.1逆变变压器原副边的接线方式..............................................................................62.2.2逆变变压器二次电压的计算..................................................................................72.3电动机参数的计算..............................................................................................................92.3.1等效直流电路总阻抗R和总电感L的计算.....................................................102.4整流电路和有源逆变电路的计算与选择.....................................................................122.4.1转子整流器的计算与元件选择.........................................................................122.4.2可控硅元件的选择与计算.................................................................................132.5定子侧变压器的选择.......................................................................................................13第三章保护电路的设计与选择.................................................................................................143.1过电压保护.....................................................................................................................153.1.1交流侧过电压保护.............................................................................................153.1.2压敏电阻保护.....................................................................................................173.1.3直流侧过电压保护措施.....................................................................................183.1.4晶闸管两端的过电压保护措施.........................................................................183.2过电流保护.....................................................................................................................193.3电压和电流上升率的限制................................................................................................203.4缺相保护：.....................................................................................................................213.5串频敏电阻保护.............................................................................................................213.6过载保护............................................................................................................................22第四章触发电路的原理及设计...................................................................................................22II4.1触发电路的选择.............................................................................................................234.1.1KC04移相触发器.............................................................................