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1、ComputerandInformationScienceFebruary,2009DesignoftheClosedLoopSpeedControlSystemforDCMotorGuoliangZhongCollegeofMechanicalandAutomotiveEngineeringSouthChinaUniversityofTechnologyGuangzhou510640,ChinaE-mail:zhgl2chl@126.comCollegeofMechanicalandAutomotiveEngineeringSouthChinaUni
2、versityofTechnologyGuangzhou510640,ChinaLiangzhongJiangE-mail:jianglzh88@163.comTheresearchisfinancedbytheGuangzhouMunicipalScienceandTechnologyKeyProjects(No.2004A10403006).(Sponsoringinformation)AbstractThisarticleintroducesthespeedcontrolprincipleofDCmotor,expatiatesonthespee
3、dcontrolsystemtakingPIC16F877SCMasthemaincontrolcomponent,utilizesthecharactersofcatchingmodule,comparingmoduleandanalog-to-digitalconversionmoduleinPIC16F877SCMtobethetriggercircuit,andgivestheprogramflowchart.Thesystemhasmanyadvantagesincludingsimplestructure,synchronizationwi
4、ththemaincircuit,stableshiftingphaseandenoughshiftingphaserange,thecontrolangleof10000steps,steplesssmoothcontrolofmotor,steeppulsefrontedge,enoughamplitudevalue,settingpulsewidth,goodstabilityandanti-jamming,andcheapcost,andthisspeedcontrolsystemwithgoodpracticalvaluescanbereal
5、izedeasily.Keywords:PIC16F877,DCmotorspeedcontrol,Controlcircuit,PIcontrolalgorithm1.IntroductionThequickdevelopmentofelectrictechnologymakesthespeedcontrolofDCmotorgraduallytranslatefromanalogtodigital,andatpresent,theKZ-Dtowagesystemwhichextensivelyadoptsthethyristorequipment(
6、i.e.siliconcontrolledthyristor,SCR)intheelectricaltowagecontrolsystemstosupplypowertoelectromotorhasreplacedcumbersomeF-Dsystemofgenerator-electromotor,andespeciallytheapplicationofSCMtechnologymakesthespeedcontroltechnologyofDCmotorenterintoanewphase.IntheDCgovernorsystem,there
7、aremanysortsofcontrolcircuit.SCMhasmanyadvantagessuchashighperformance,quickspeed,smallvolume,cheappriceandreliablestability,extensiveapplicationandstrongcurrency,anditcanincreasetheabilityofcontrolandfulfilltherequirementofreal-timecontrol(quickreaction).Thecontrolcircuitadopti
8、nganalogyordigitalcircuitcanbeimplementedbySCM.
