步进电机和伺服电机的系统控制中英文翻译资料.doc

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1、SELECTINGTHEMOTORTHATSUITSYOURAPPLICATIONMotioncontrol,initswidestsense,couldrelatetoanythingfromaweldingrobottothehydraulicsysteminamobilecrane.InthefieldofElectronicMotionControl,weareprimarilyconcernedwithsystemsfallingwithinalimitedpowerrange,typicallyuptoabout10HP(7KW),andr

2、equiringprecisioninoneormoreaspects.Thismayinvolveaccuratecontrolofdistanceorspeed,veryoftenbothandsometimesotherparameterssuchastorqueoraccelerationrate.Inthecaseofthetwoexamplesgiven,theweldingrobotrequiresprecisecontrolofbothspeedanddistance;thecranehydraulicsystemusesthedriv

3、erasthefeedbacksystemsoitsaccuracyvarieswiththeskilloftheoperator.Thiswouldn’tbeconsideredamotioncontrolsysteminthestrictsenseoftheterm.Ourstandardmotioncontrolsystemconsistsofthreebasicelements:Fig.1ElementsofmotioncontrolsystemThemotor，Thismaybeasteppermotor(eitherrotaryorline

4、ar),aDCbrushmotororabrushlessservomotor.Themotorneedstobefittedwithsomekindoffeedbackdeviceunlessitisasteppermotor.Fig.2showsasystemcompletewithfeedbacktocontrolmotorspeed.Suchasystemisknownasaclosed-loopvelocityservosystem.Fig.2Typicalclosedloop(velocity)servosystemThedrive，thi

5、sisanelectronicpoweramplifierthatdeliversthepowertooperatethemotorinresponsetolow-levelcontrolsignals.Ingeneral,thedrivewillbespecificallydesignedtooperatewithaparticularmotortype–youcan’tuseastepperdrivetooperateaDCbrushmotor,forinstance.ApplicationAreasofMotorTypesStepperMotor

6、sStepperMotorBenefitsSteppermotorshavethefollowingbenefits:•Lowcost•Ruggedness•Simplicityinconstruction•Highreliability•Nomaintenance•Wideacceptance•Notweakingtostabilize•Nofeedbackcomponentsareneeded•Theyworkinjustaboutanyenvironment•Inherentlymorefailsafethanservomotors.Therei

7、svirtuallynoconceivablefailurewithinthestepperdrivemodulethatcouldcausethemotortorunaway.Steppermotorsaresimpletodriveandcontrolinanopen-loopconfiguration.Theyonlyrequirefourleads.Theyprovideexcellenttorqueatlowspeeds,upto5timesthecontinuoustorqueofabrushmotorofthesameframesizeo

8、rdoublethetorqueoftheequivalentbrushlessmotor.T