电动机控制中英文对照外文翻译文献Word格式文档下载.docx
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电动机控制中英文对照外文翻译文献Word格式文档下载.docx
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(文档含英文原文和中文翻译)
原文:
ControlofElectricwinch
Formotorcontrol,weknowthebestwayistousethestylebuttonstomovethemanysimplemanualconsole.Andthisconsole,insomeapplicationsmaystillbeagoodchoice,assomecomplexcontrolheadachecanalsobeused.Thisarticledescribesinyourdesign,buildorpurchasewinchcontroller,youhavethemotor'
sbasicelectricalequipmentandyouwillneedtoaddresstheuserinterfacecommandaddressed.
First,themanualshouldbeamanualcontrolconsoletype,soifyouremoveyourfingerbuttons,hoistwillstop.Inaddition,eachcontrolstationequippedwithanemergencyneedtobrake,hoisttheemergencybraketocutoffallpower,notjustthecontrolcircuit.Thinkaboutit,ifthehoistatthestop,itdidnotstop,youdoneedawaytocutoffthefaultlineprotectionpower.Setthetableinthecontrolofakeyoperatedswitch,isalsoaverygoodidea,especiallyinthelineleadingtotheworkstationcannotcontrol,youcanusetheswitch.
(inthedesignoftheconsole,eventhesimplestmanualconsole,butalsoconsidersettingbyspecializedpersonneltooperatethesafeoperationofthekeys.)
Constantspeedmotorcontrol
Forafixedspeedwinchactualcontroldeviceisathree-phasestarter.Turnthemotorisreversed,byasimpleswitchcontrolledphasetransformationsequencefromABCtoCBA.Theseactionsarecompletedbytwothree-polecontactor-style,andtheyareinterlocked,sothattheycannotbesimultaneouslyclosed.NEC,requiredinadditiontooverloadandshortcircuitprotectiondevices.Toprotectthemotoragainstoverloadduetomechanicaleffectscausedbyoverheatingintheheattobeinstalledinsidethestarteroverloaddelaydevice.Whentheheatoverloaddelaydeviceoverheating,ithasalongdoubleoffthemetalmotorpower.InadditionInaddition,youcanalsoselectathermistorcanbeinstalledinthemotorwindingway,itcanbeusedtomonitormotortemperaturechanges.Fortheshort-circuitprotection,wegenerallyusedbymotorfusestoachieve.
Alinearcurrentindependentcontactors,thecontactorsareconfiguredshouldbemorethanthecurrentmaincircuitcontactor,soastoachievethepurposeofredundancy.Thissetsthecurrentcontactoriscontrolledbythesecuritycircuit,suchas:
emergencybrakeandthemore-waylimits.
Wecanusethelimitswitchestoachievetheaboveoperation.Whenyoureachtheendofthenormaltravellimitposition,thehoistwillstop,andyoucanonlymovethewinchintheoppositedirection(ie,thedirectionawayfromthelimitposition.)Thereisalsoneedforamorelimitedwayjustincase,duetoelectricalormechanicalproblems,leavingtheoperationofhoistlimitbitmorethannormal.Ifyourunintomorelimiter,linearcontactorwillopen,therefore,cannotbedrivenwinchwillexceedthislimitposition.Ifthishappens,youneedtoaskaprofessionaltechniciantochecktheleadtomeetthemorespecificreasonslimiter.Then,youcanusethestartertoggleswitchinsidetheelasticrecoveryprocesstodealwithmoreproblems,ratherthantrippingdeviceorahand-offthecurrentcontacts.
Anecessaryconditionforspeed
Ofcourse,thesimplefixedspeedstarterisreplacedbyvariablespeeddrives.Thismakesthingsstarttogetinterestingagain!
Ataminimum,youneedtoaddaspeedcontroldialoperationplatform.Joystickisabetteruserinterface,becauseitmakesyoumovepartsofamoreintuitivecontrol.
Unfortunately,youcannotjustfromyourlocalconsoletosendcommandstocontroltheoldvariablespeeddrives,inaddition,youcannotwantitintheinitialstages,willbeabletoenhancethesafeandreliableanddecentralizedfacilities.Mostofthevariablespeeddrivecannotachievetheserequirements,becausetheyarenotdesignedtodoupgradingwork.Driversneedtobesettoreleasethebrakebeforethemotorcangeneratetorque,andwhenparking,thatis,beforetherevocationoftorque,thebrakewillbethefirstaction.
Formanyyears,DCmotorsanddrivesprovideanumberofcommonsolutions,suchaswhentheyareinavarietyofspeedswithgoodtorquecharacteristics.FormostofthehoistofthelargedemandforDCmotorisveryexpensive,andthatthesametypeofACmotorthanthemuchmoreexpensive.AlthoughtheearlyACdrivesarenotveryuseful,astheyhaveaverylimitedscopeofapplicationofthespeed,butproducedonlyasmalllow-speedtorque.Now,withtheDCdrivesthedevelopmentoflowcostandalargenumberofavailableACmotorshasledtoacommunication-drivenrevolution.
VariablespeedACdrivesintwoseries.Frequencyconverterhasbeenwidelyknownand,indeed,easytouse.ThesedrivesconvertACintoDC,andthen,andthenconvertitbacktoexchange,theexchangeaftertheconversionisadifferentfrequency.Ifthedriveproducedtheexchangeof30Hz,60Hzanormalmotorwillrunathalfspeed.Theoretically,thisisverygood,butinpractice,thiswillhavealotofproblems.Firstofall,atypicallinearmotor60Hzfrequenciesbelow2Hz3Hzareaortherewillbeerrors,andstartcog(thaturgentpush,yank),orparking.Thiswilllimityourspeedrangelowerthan20:
1,almostnotadaptedtotheoperationalphaseofthefineadjustment.Second,manylow-costconverterisnotabletoprovidetheratedtorqueatlowspeeds.Useofthesedrives,willresultintherapidmovetoupgradethecomponentsorcompletefailure,precisely,whenyoutrytoupgradeastablescientificinstruments,youdonotwanttoseethissituation.Somenewinverterisaclosed-loopsystem(togetfeedbackfromthemotortoprovideamoreaccuratespeedcontrol),andthemotorwillworkquitewell.
AnotherseriesofACdrivesistheflowvectortypedrive.Thesecomponentsrequireinstallationofthespindlemotorencoder,encodermakesuseofthesedrivescanaccuratelymonitortherotationofthemotorarmature.Processoraccuratelymeasuredmagneticfluxvectorvaluesthatarerequiredtomakethearmatureatagivenspeedrotation.Thesedrivesallowinfinitespeed,soyouactuallycanproduceatzerospeedtoratedtorque.Thesedrivesprovideprecisespeedandpositioncontrol,sothesedrivesinhighperformanceapplicationstobewelcomed.
(BasedonPLCcontrollersprovidesystemstatusandcontroloptions.Thisscreenshowstheoperatorfullaccesstothenine-storyelevatorenhancethecontrolpanel.)
PLC-basedsystems
IsthefullnameofaPLCprogrammablelogiccontroller.Firstofall,PLCcontrollerdevelopedtoreplacethefiftiesandsixties-basedindustrialcontrolsystemrelay,theyworkinharshindustrialindoorenvironments.ThesearemodularsystemsthathavealargevarietyofI/Omodules.Themodularsystemcaneasilyachievethesemi-customhardwareconfigurationassembled,andtheresultingconfigurationisalsoveryreasonableprice.Thesemodulesinclude:
positioncontrolmodule,thecounter,A/DandD/Aconverter,andavarietyofphysicalstateorphysicalcontactwithclosedoutputmodule.LargenumberofdifferenttypesofI/OcomponentsandPLCmodulepropertymakesitaneffectivewaytoassemblecustomandsemicustomcontrolsystem.
ThebiggestshortcomingofPLCsystemsisthelackoftherealnumberofdisplaytotellyouwhatisbeingdoneandthePLConthePLCprogramtohelpyou.
Thefirstisprofessionalentertainmentforthelarge-scalePLCsystemisoneoftheoriginalinLasVegas,MGM(nowBaileyCompany)oftheridingandcarriagesystem.ManymanufacturersofferastandardPLC-basedsemi-automatedacousticsystemsandahostofsigns,setthelocationofthecommandlineinterpreter,andtheupgradingofthecontrolsystemisalsoavailable.Usingstandardmodulestosetuser-definedsystemconfigurationcapabilityisbasedonthePLCcontrollerofthegreatestadvantage.
High-endcontroller
Forcomplextransmission,thecontrollerbecamecomplex,morethanspeed,timeandlocationcontrol.Theyincludecomplexinstructionstowriteandrecordthemovementcontour,andtheprocessingcanimmediatelyruntheabilitytomulti-pointinstructions.
Manylargeoperahouseistowardthedirectionofpointliftsystem,whereeachoneisequippedwitharopetoenhanceindependentwinches,ropeequivalenttothoseofeachdimmercircuit.Whenmorethanonehoistisusedtoenhancetheindividualpart,thehoistmustbefullysynchronous,ortheloadtoshift,sowillleadtoaseparatewinchbecomestheriskofoverload.Controlsystemmustbeabletobeselectedtokeeppacewinch,orahoistwinchisnotabletomaintainsynchronizationwiththeother,canprovidethesamehigh-speedparkingcapacity.Foratypicalspeedof240ft/minandawinchtomaintaintherateoferrorofbetween1/8pointsofequipment,youonlyhavelessthanthreemicrosecondsoftimetoidentifyproblemsandtrytocorrecttheerrorThehoistspeed,makesureyoufail,youstartallthewinchstopthegroup.Thiswillrequirealargeamountofcomputation,fastI/Ointerface,andeasytousetowritesoftware.
Forlargeropecontrolsystemhastwoverydifferentsolutions.Thefirstistouseaseparateconsole,theproblemingeneralterms,thisconsoleshouldbeinstalledintheappropriatelocationoftheoperatorperspective.However,thisnotonlyfromoneangletoanotherangle,butstillcannotgetaninstructiontoanotherinstructionfromthecontrol.Thesedifficultieshavebeenpartiallyresolved.Installedindifferentlocationsthroughtheuseofvideocameras,andthesecamerasconnectedtothethree-dimensionaldisplaygraphics,thesegraphicsenablestheoperatortoobservefromtheperspectiveofanyofthethreecoordinatesintheexpecteddirectionofropemovement.Theseoperato
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