*******学院毕业设计基于PLC的直流电机调速系统设计学生：学号：专业：班级：指导教师：****学院自动化与电子信息学院****年摘要设计选用日本三菱公司FX2N-16MT基本单元和FX2N-4AD，FX2N-2DA模拟量输/输出扩展模块，并利用其功能指令设计的直流脉宽双闭环调速系统，实现了调速过程速度快、精度高,控制系统的参数便于调试和高工作可靠性，通过给定的调速系统硬件配置和梯形图，经模拟调试输出信号验证了各项指标均满足调速系统的要求。关键词：PLC；调速系统；应用ABSTRACTThedoubleclosed-loopDCPWMspeedsystemofdirectmotorusestheFX2N-16MTbasicunitofJapaneseMitsubishicompanyandFX2N-4ADs,FX2N-2DAemulationinput/outputexpandingmold,makinguseofitsfunctioninstruction.Itrealizesfastadjustmendofthespeedcourse,highprecision,whichmakeiteasytodebugcontrolprocedureandworkreliable,whichisadevelopmentdirectionintheindustrialcontrol.Hardwaredispositionandladderchartaregiveninthistext.Itcanbeadjustedbyemulationandvariousindexsignsofoutputsignalallsatisfytherequirementsoftheadjustsystem.Keywords：PLC；AdjustingSpeedSystem；Application3目录1.1直流调速系统的发展史概述.............................................................................................11.2可编程控制器PLC.............................................................................................................21.2.1PLC的发展概述......................................................................................................21.2.2PLC的特点..............................................................................................................31.3选题背景及论文主要内容.................................................................................................41.3.1选题背景..................................................................................................................41.3.2论文的主要内容......................................................................................................4第2章直流调速系统................................................62.1调速系统的性能指标.........................................................................................................62.1.1稳态性能指标..........................................................................................................72.1.2动态指标.................................................................................................................82.2PWM直流调速系统........................................................................................................102.2.1直流电动机的PWM控制原理.............................................................................102.2.2PWM直流调速系统的组成..................................................................................112.2.3PWM调速系统的主要参数..................................................................................172.3双闭环直流脉宽调速系统...............................................................................................192.3.1电流、转速反馈环节............................................................................................192.3.2设计中的调节器计算............................................................................................212.3.3双闭环脉宽调速系统的起动过程........................................................................25第3章现代PLC控制技术..........................................273.1PLC的组成和分类............................
