应用PWM控制器集成电路实现

苏州市职业大学毕业设计（论文）说明书设计（论文）题目应用PWM控制器集成电路实现的三相电动机变频调速系统系电子信息工程系专业班级08电气3班姓名白昊宇学号087301308指导教师叶国平2011年5月29日[应用PWM控制器集成电路实现的三相电动机变频调速系统]-1-摘要交流变频调速器与异步电机的结合是一种理想的电力拖动调速方式。与直流电机拖动相比,环境适应性强,能极大地减少维护工作量,提高机器的生产能力,易满足高转速大容量的要求,造价也低与其它调速方式相比较,最突出的优点是节能最优。而且它还具有体积小、重量轻、易操作、精度高、应用范围广、机械特性好、自我保护功能强、易实现自动化等优点，所以它是企业进行工程设计、设备改造和技术革新的最佳选择方案，其应用前景会越来越广阔。本文首先介绍单相异步电动机工作原理，调速方法，变频调速原理。其次是介绍专用芯片ML4423，专用芯片IR2118，还有功率场效应管IRF740。最后进行了单相异步电动机变频调速系统的主电路设计，控制电路设计和电源电路设计。关键词：异步电动机，变频调速，专用芯片ML4423，IR2118，场效应管IRF740[应用PWM控制器集成电路实现的三相电动机变频调速系统]-2-AbstractAcfrequencyconversiongovernorandasynchronousmotorcombiningisanidealpowerdragspeedmode.Comparedwithdcmotor,environmentadaptabledrag,cangreatlyreducemaintenance,andimprovethemachine'sproductioncapacity,easytomeethighspeedlargecapacityrequirements,costislowcomparedwithothergoverningway,themostprominentadvantageisenergy-savingoptimal.Anditalsohassmallvolume,lightweight,easyoperation,highprecision,applicationscope,mechanicalproperties,selfprotectionfunctionofstrong,easytorealizeautomationetc,soitistheenterpriseforengineeringdesign,equipmentreformandtechnicalinnovation,itsthebestoptionswouldbemoreandmorewideapplicationprospect.Thispaperfirstintroducesworkingprinciple,singlephaseasynchronousmotorspeedmethod.frequencyconversionprinciple.Secondisthespecialchip,ML4423introducedIR2118specialchip,andpowermosfetIRF740.Thesinglephaseasynchronousmotor,themaincircuitofvariablefrequencyspeedregulationsystem,controlcircuitdesignanddesignofpowersupplycircuitdesign.Keywords:Asynchronousmotor,variablefrequencyspeedregulation,specialchipML4423,IR2118，IRF740mosfet[应用PWM控制器集成电路实现的三相电动机变频调速系统]-3-目录摘要...........................................................................................................................................1第1章三相异步电动机................................................................................................................21.1三相交流异步电动机的工作原理.................................................................................21.1.1三相异步电动机的简介......................................................................................21.1.2三相异步电动机的结构......................................................................................21.1.3三相异步电动机的工作原理..............................................................................51.2三相交流异步电动机的调速方法.................................................................................81.2.1三相交流异步电动机的调速..............................................................................81.2.2三相交流异步电动机的调速分类......................................................................81.3三相交流异步电动机的变频调速原理.......................................................................111.3.1变频器.................................................................................................................111.3.2三相异步电动机的变频调速原理....................................................................12第2章主要元件介绍..................................................................................................................142.1专用芯片ML4423............................................................................................................142.1.1专用芯片ML4423的管脚功能........................................................................142.1.2ML4423的内部结构和工作原理......................................................................182.2专用芯片IR2118............................................................................................................192.2.1IR2118芯片简介................................................................................................192.2.2IR2118芯片特点................................................................................................192.2.3IR2118芯片典型连接.......................................................................................202.2.4IR2118芯片封装形式.......................................................................................202.2.5IR2118芯片的应用电路...................................................................................21[应用PWM控制器集成电路实现的三相电动机变频调速系统]-4-2.3功率场效应管IRF740...................................................................................................232.3.1场效应管.............................................................................................................232.3.2场效应管IRF740...............................................................................................24第3章三相异步电动机变频调速系统的设计........................................................................273.1主电路设计.....................................................................................................................273.2控制电路设计.................................................................................................................283.3电源电路设计.................................................................................................................30结论.........................................................................................................................................31参考文献..................................