基于MATLAB的直流电机双闭环调速系统仿真姓名：张xx学号：113220110x华北电力大学2014年4月1基于MATLAB的直流电机双闭环调速系统摘要直流电动机具有良好的起动、制动性能，宜于在大范围内平滑调速，在许多需要调速或快速正反向的电力拖动领域中得到了广泛的应用。从控制的角度来看，直流调速还是交流拖动系统的基础。该系统中设置了电流检测环节、电流调节器以及转速检测环节、转速调节器，构成了电流环和转速环，前者通过电流元件的反馈作用稳定电流，后者通过转速检测元件的反馈作用保持转速稳定，最终消除转速偏差，从而使系统达到调节电流和转速的目的。该系统起动时，转速外环饱和不起作用，电流内环起主要作用，调节起动电流保持最大值，使转速线性变化，迅速达到给定值；稳态运行时，转速负反馈外环起主要作用，使转速随转速给定电压的变化而变化，电流内环跟随转速外环调节电机的电枢电流以平衡负载电流。并通过Simulink进行系统的数学建模和系统仿真，分析双闭环直流调速系统的特性。关键词：直流电机，双闭环，PWM，转速调节器，电流调节器，SimulinkStudyoftheSpeed-adjustingTechnologyforDCMotorbasedonMatlab2AbstractThedesignusesthyristors,diodesandotherdevicesdesignsaspeed,currentdouble-loopSCRDCconvertersystem.Thesystemsetsupthecurrentdetectingaspect,thecurrentregulatorACRandthespeeddetectinglink,speedregulatorASR,composesthecurrentcentralandthespeedcentral,theformerthroughthefeedbackofthecurrentcomponentstoleveloffthecurrent,thelatterthroughthefeedbackofspeeddetectingdevicetomaintainthespeedstablyandfinallyeliminatesthedeviationofspeedbias.，thusallowingthesystemtothepurposeofregulatingthecurrentandspeed.whenthesystemstarts,thespeedouterringsaturatsnon-functional,thecurrentinnerringplaysamajorroletoregulatethestartingcurrenttomaintainthemaximumsothatthespeedlinearchange,toreachagivenvalue;whenitoperatessteadily,thespeednegativefeedbackfromtheouterringplaysamajorrole,toletthespeedchangeswiththegivenspeedvoltage,atthesametimethecurrentinnerringregulatesthearmaturecurrentofmotoradjustmenttobalancetheloadcurrent.Simulinkforsystemthroughmathematicalmodelingandsystemsimulation.Finallydisplaycontrolsystemmodelandtheresultsofanti-truth.Keywords:DCmotor,Double-loop,PWM,thespeedregulator,thecurrentregulator，Simulink目录前言.............................................................................4第一章绪论....................................................................61．1直流调速系统的概述......................................................61.1.1直流电动机的调速方法....................................................61.2PWM的相关介绍.............................................................7第二章总体方案设计..........................................................82.1方案比较....................................................................82.2方案论证....................................................................92.3方案选择....................................................................932.4设计参数....................................................................10第三章单元模块的仿真电路设计...............................................103.1转速给定电路设计..........................................................103.2转速检测电路设计..........................................................103.3电流检测电路设计..........................................................113.4整流及晶闸管保护电路设计.................................................12第四章双闭环直流调速系统的仿真设计...................................
