步进电机和伺服电机的系统控制英文翻译正文.docx
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步进电机和伺服电机的系统控制英文翻译正文.docx
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步进电机和伺服电机的系统控制英文翻译正文
StepMotor&ServoMotorSystemsandControls
WITHSUPPORTSOFTWARE,THERE’SNOMOREGUESSWORK
MotionArchitect®SoftwareDoestheWorkforYou...Configure,Diagnose,DebugCompumotor’sMotionArchitectisaMicrosoft®Windows™-basedsoftwaredevelopmenttoolfor6000Seriesproductsthatallowsyoutoautomaticallygeneratecommentedsetupcode,editandexecutemotioncontrolprograms,andcreateacustomoperatortestpanel.TheheartofMotionArchitectistheshell,whichprovidesanintegratedenvironmenttoaccessthefollowingmodules.
•SystemConfigurator—Thismodulepromptsyoutofillinallpertinentset-upinformationtoinitiatemotion.Configurabletothespecific6000Seriesproductthatisselected,theinformationisthenusedtogenerateactual6000-languagecodethatisthebeginningofyourprogram.
•ProgramEditor—Thismoduleallowsyoutoeditcode.Italsohasthecommandsavailablethrough“Help”menus.Auser’sguideisprovidedondisk.
•TerminalEmulator—Thismoduleallowsyoutointeractdirectlywiththe6000product.“Help”isagainavailablewithallcommandsandtheirdefinitionsavailableforreference.
•TestPanel—Youcansimulateyourprograms,debugprograms,andcheckforprogramflowusingthismodule.
BecauseItsWindows,YouAlreadyKnowHowtoUseIt
MotionArchitect®hasbeendesignedforusewithall6000Seriesproducts—forbothservoandsteppertechnologies.TheversatilityofWindowsandthe6000Serieslanguageallowyoutosolveapplicationsrangingfromtheverysimpletothecomplex.
MotionArchitectcomesstandardwitheachofthe6000Seriesproductsandisatoolthatmakesusingthesecontrollersevenmoresimple—shorteningtheprojectdevelopmenttimeconsiderably.Avalue-addedfeatureofMotionArchitect,whenusedwiththe6000ServoControllers,isitstuningaide.Thisadditionalmoduleallowsyoutographicallydisplayavarietyofmoveparametersandseehowtheseparameterschangebasedontuningvalues.
UsingMotionArchitect,youcanopenmultiplewindowsatonce.Forexample,boththeProgramEditorandTerminalEmulatorwindowscanbeopenedtoruntheprogram,getinformation,andthenmakechangestotheprogram.
On-linehelpisavailablethroughoutMotionArchitect,includinginteractiveaccesstothecontentsoftheCompumotor6000SeriesSoftwareReferenceGuide.
SOLVINGAPPLICATIONSFROMSIMPLETOCOMPLEX
ServoControlisYourswithServoTunerSoftware
Compumotorcombinesthe6000SeriesservocontrollerswithServoTunersoftware.TheServoTunerisanadd-onmodulethatexpandsandenhancesthecapabilitiesofMotionArchitect®.
MotionArchitectandtheServoTunercombinetoprovidegraphicalfeedbackofreal-timemotioninformationandprovideaneasyenvironmentforsettingtuninggainsandrelatedsystemparametersaswellasprovidingfileoperationstosaveandrecalltuningsessions.
DrawYourOwnMotionControlSolutionswithMotionToolboxSoftware
MotionToolbox™isanextensivelibraryofLabVIEW®virtualinstruments(VIs)foricon-basedprogrammingofCompumotor’s6000Seriesmotioncontrollers.
WhenusingMotionToolboxwithLabVIEW,programmingofthe6000Seriescontrollerisaccomplishedbylinkinggraphicicons,orVIs,togethertoformablockdiagram.
MotionToolbox’shasalibraryofmorethan150command,status,andexampleVIs.AllcommandandstatusVIsincludeLabVIEWsourcediagramssoyoucanmodifythem,ifnecessary,tosuityourparticularneeds.MotionToolboxalsusermanualtohelpyougutupandrunningquickly.
comprehensiveMSoftwareforComputer-AidedMotionApplications
CompuCAMisaWindows-basedprogrammingpackagethatimportsgeometryfromCADprograms,plotterfiles,orNCprogramsandgenerates6000codecompatiblewithCompumotor’s6000Seriesmotioncontrollers.AvailableforpurchasefromCompumotor,CompuCAMisanadd-onmodulewhichisinvokedasautilityfromthemenubarofMotionArchitect.
FromCompuCAM,runyourCADsoftwarepackage.Onceadrawingiscreated,saveitaseitheraDXFfile,HP-GLplotfileorG-codeNCprogram.ThisgeometryisthenimportedintoCompuCAMwherethe6000codeisgenerated.Aftergeneratingtheprogram,youmayuseMotionArchitectfunctionssuchaseditingordownloadingthecodeforexecution.
MotionBuilderSoftwareforEasyProgrammingofthe6000Series
MotionBuilderrevolutionizesmotioncontrolprogramming.Thisinnovativesoftwareallowsprogrammerstoprograminawaytheyarefamiliarwith—aflowchart-stylemethod.MotionBuilderdecreasesthelearningcurveandmakesmotioncontrolprogrammingeasy.
MotionBuilderisaMicrosoftWindows-basedgraphicaldevelopmentenvironmentwhichallowsexpertandnoviceprogrammerstoeasilyprogramthe6000Seriesproductswithoutlearninganewprogramminglanguage.Simplydraganddropvisualiconsthatrepresentthemotionfunctionsyouwanttoperform.
MotionBuilderisacompleteapplicationdevelopmentenvironment.Inadditiontovisuallyprogrammingthe6000Seriesproducts,usersmayconfigure,debug,download,andexecutethemotionprogram.
SERVOVERSUSSTEPPER...WHATYOUNEEDTOKNOW
MotorTypesandTheirApplications
Thefollowingsectionwillgiveyousomeideaoftheapplicationsthatareparticularlyappropriateforeachmotortype,togetherwithcertainapplicationsthatarebestavoided.Itshouldbestressedthatthereisawiderangeofapplicationswhichcanbeequallywellmetbymorethanonemotortype,andthechoicewilltendtobedictatedbycustomerpreference,previousexperienceorcompatibilitywithexistingequipment.
AhelpfultoolforselectingthepropermotorforyourapplicationisCompumotor’sMotorSizingandSelectionsoftwarepackage.Usingthissoftware,userscaneasilyidentifytheappropriatemotorsizeandtype.
Hightorque,lowspeed
continuousdutyapplicationsareappropriatetothestepmotor.Atlowspeedsitisveryefficientintermsoftorqueoutputrelativetobothsizeandinputpower.Microsteppingcanbeusedtoimprovesmoothnessinlowspeedapplicationssuchasameteringpumpdriveforveryaccurateflowcontrol.
Hightorque,highspeed
continuousdutyapplicationssuittheservomotor,andinfactastepmotorshouldbeavoidedinsuchapplicationsbecausethehigh-speedlossescancauseexcessivemotorheating.
Short,rapid,repetitivemoves
arethenaturaldomainofthestepperduetoitshightorqueatlowspeeds,goodtorque-to-inertiaratioandlackofcommutationproblems.ThebrushesoftheDCmotorcanlimititspotentialforfrequentstarts,stopsanddirectionchanges.
Lowspeed,highsmoothnessapplications
areappropriateformicrosteppingordirectdriveservos.
Applicationsinhazardousenvironments
orinavacuummaynotbeabletouseabrushedmotor.Eitherastepperorabrushlessmotoriscalledfor,dependingonthedemandsoftheload.Bearinmindthatheatdissipationmaybeaprobleminavacuumwhentheloadsareexcessive.
SELECTINGTHEMOTORTHATSUITSYOURAPPLICATION
Introduction
Motioncontrol,initswidestsense,couldrelatetoanythingfromaweldingrobottothehydraulicsysteminamobilecrane.InthefieldofElectronicMotionControl,weareprimarilyconcernedwithsystemsfallingwithinalimitedpowerrange,typicallyuptoabout10HP(7KW),andrequiringprecisioninoneormoreaspects.Thismayinvolveaccuratecontrolofdistanceorspeed,veryoftenboth,andsometimesotherparameterssuchastorqueoraccelerationrate.Inthecaseofthetwoexamplesgiven,theweldingrobotrequiresprecisecontrolofbothspeedanddistance;thecranehydraulicsystemusesthedriverasthefeedbacksystemsoitsaccuracyvarieswiththeskilloftheoperator.Thiswouldn’tbeconsideredamotioncontrolsysteminthestrictsenseoftheterm.Ourstandardmotioncontrolsystemconsistsofthreebasicelements:
Fig.1Elementsofmotioncontrolsystem
Themotor.Thismaybeasteppermotor(eitherrotaryorlinear),aDCbrushmotororabrushlessservomotor.Themotorneedstobefittedwithsomekindoffeedbackdeviceunlessitisasteppermotor.
Fig.2showsasystemcompletewithfeedbacktocontrolmotorspeed.Suchasystemisknownasaclosed-loopvelocityservosystem.
Fig.2Typicalclosedloop(velocity)servosystem
Thedrive.Thisisanelectronicpoweramplifierthatdeliversthepowertooperatethemotorinresponsetolow-levelcontrolsignals.Ingeneral,thedrivewillbespecificallydesignedtooperatewithaparticularmotortype–youcan’tuseastepperdrivetooperateaDCbrushmotor,forinstance.
ApplicationAreasofMotorTypes
StepperMotors
StepperMotorBenefits
Steppermotorshavethefollowingbenefits:
•Lowcost
•Ruggedness
•Simplicityinconstruction
•Highreliability
•Nomaintenance
•Wideacceptance
•Notweakingtostabilize
•Nofeedbackcomponentsareneeded
•Theyworkinjustaboutanyenvironment
•Inherentlymorefailsafethanservomotors.
Thereisvirtuallynoconceivablefailurewithinthestepperdrivemodulethatcouldcausethemotortorunaway.Steppermotorsaresimpletodriveandcontrolinanopen-loopconfiguration.Theyonlyrequirefourleads.Theyprovideexcellenttorqueatlowspeeds,upto5timesthecontinuoustorqueofabrushmotorofthesameframesizeordoublethetorqueoftheequivalentbrushlessmotor.Thisofteneliminatestheneedforagearbox.Astepper-driven-systemisinherentlystiff,withknownlimitstothedynamicpositionerror.
StepperMotorDisadvantages
Steppermotorshavethefollowingdisadvantages:
•Resonanceeffectsandrelativelylongsettling
times
•Roughperformanceatlowspeedunlessa
microstepdriveisused
•Liabilitytoundetectedpositionlossasaresultof
operatingopen-loop
•Theycon
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