外文翻译.docx
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外文翻译.docx
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外文翻译
外文资料与中文翻译
外文资料:
Motortype
1.ThePowerSupplyCategory:
MotorpowersupplyaccordingtothedifferentworkcanbedividedintoDCmotorandACmotor.ACMotorisalsodividedintothethree-phasesingle-phasemotorsandmotor.
2.accordingtothestructureandworkingprincipleofclassification:
Structureandworkingprincipleofelectricmotorscanbedividedintodirectcurrentmotor,asynchronousmotorandsynchronousmotor.Synchronousmotorcanbedividedintopermanentmagnetsynchronousmotors,reluctancesynchronousmotorsandhysteresissynchronousmotor.InductionmotorcanbedividedintoinductionmotorandACcommutatormotor.Dividedintothree-phaseinductionmotorasynchronousmotor,single-phaseasynchronousmotorandshadedpoleinductionmotors.ACcommutatormotorisdividedintosingle-phaseseriesmotor,ACandDCmotorsandrepulsionmotor.DCmotoraccordingtothestructureandworkingprinciplecanbedividedintobrushlessDCmotorandabrushDCmotor.BrushedDCmotorscanbedividedintopermanentmagnetDCmotorandelectromagneticDCmotor.ElectromagneticDCmotorisdividedintoseriesexcitedDCmotor,andLiDCmotor,DCmotorandre-excitedDCmotorexcitation.PermanentmagnetDCmotorisdividedintorareearthpermanentmagnetDCmotor,FerritepermanentmagnetDCmotorandAlnicopermanentmagnetDCmotor.
3.ClickStartandRunCategory:
Bystartingandrunningmotorscanbedividedintosingle-phasecapacitorstartinductionmotor,capacitorrunsinglephaseinductionmotor,capacitorstartsinglephaseinductionmotoroperationandsub-phasesingle-phaseinductionmotor.
4.byuseclassification:
Motordrivenbypurposecanbedividedintomotorandcontrolmotor.Drivemotorisdividedintopowertools(includingdrilling,polishing,polishing,grooving,cutting,reamingandothertools)withthemotor,householdappliances(includingwashingmachines,electricfans,refrigerators,airconditioners,taperecorders,VCRs,DVDmachines,vacuumcleaners,cameras,hairdryer,electricshaver,etc.)withGeneralMotorsandothersmallmachineryandequipment(includingavarietyofsmalltools,smallmachinery,medicalequipment,electronicequipment,etc.)electricmotor.Steppermotorcontrolisdividedintomotorandservomotors.
5.TherotorstructurebyCategory:
Motorcanbedividedaccordingtothestructureoftherotorcageinductionmotor(theoldstandardcalledthesquirrelcageinductionmotor)andthewoundrotorinductionmotor(theoldstandardcalledWindingInductionMotor).
6.classificationofmotorspeedbyrunningbyrunningspeedcanbedividedintohigh-speedmotor,lowspeedmotor,constantspeedmotor,speedmotor.Low-speedmotorisdividedintogearmotor,electromagneticdecelerationmotor,torquemotor,andclaw-polesynchronousmotors.Inadditiontospeedmotorscanbedividedintoaclassconstantspeedmotor,motorlevelconstant,thereinfinitelyvariablespeedmotorandvariablespeedmotors,itcanalsobedividedintoelectromagneticspeedmotor,DCmotorspeedcontrol,PWMfrequencyconversionmotorandswitchReluctanceMotor.ServomotorservomotorservomotorAutomaticcontroldevicefortheimplementationofcomponentsofmicro-specialmotor.Alsoknownastheimplementationofmotor.Itsfunctionistoconvertelectricalsignalsintotheshaftangulardisplacementorangularvelocity.
ServomotorpointsofACandDCtypes.ACservomotorworksthesamewiththeACinductionmotor.Therearetwophasesinthestatorspatialdisplacementof90°angleandcontrolwindingfieldwindingWfWcoWftakeaconstantACvoltageappliedtotheWcontheuseofACvoltageorphasechanges,tocontrolmotoroperationpurposes.ACservomotorhasastable,controllable,fastresponse,highsensitivityandmechanicalpropertiesandregulationcharacteristicsofthenonlinearityindexstrict(requiringlessthan10%,respectively15%andlessthan15%~25%),etc.characteristics.DCservomotorworksthesamewiththegeneralDCmotor.ChangeUaorchangeφ,cancontroltheDCservomotorspeed,butgenerallyusethearmaturevoltagecontrolmethod.InthepermanentmagnetDCservomotor,thefieldwindingisreplacedbyapermanentmagnet,magneticfluxφconstant.DCservomotorhasagoodlinearadjustmentcharacteristicsandfasttimeresponse.Servo:
fromtheGreekword"slave"means.Peoplewantto"servo"docilewhenahandytool,subjecttotherequirementsofthemovementcontrolsignal.Beforethesignaltotherotorstationary;signalarrived,therotorrotationimmediately;whenthesignaldisappears,stoptherotorimmediatelyturnontheirown.Becauseofits"servo"performance,hencethename.ServomotorsaregenerallydividedintoDCServoandACServo.TheDCservomotorsAdvantages:
accuratespeedcontrol,torquespeedcharacteristicsofveryhard,issimple,easytouse,thepriceadvantage.
Disadvantages:
brushcommutation,speedlimits,additionalresistance,wearparticlesgenerated(forcleanroom).TheACservomotorAdvantages:
Goodspeedcontrolcharacteristics,thespeedcontroloftheregioncanachieveasmooth,almostwithoutoscillation;highefficiency,90%ormore,donotheat;high-speedcontrol;high-precisionpositioncontrol(dependingonwhichencoder);ratedoperationintheregion,toachieveconstanttorque;lownoise;nobrushwear,maintenance-free;notproducewearparticles,thereisnosparkforcleanrooms,easytoviolentenvironment,lowinertia.
Disadvantages:
morecomplexcontrol,drives,PIDparametersneedtoadjustthetuningscene,theneedformoreconnectionDCservomotorapplications:
DCservomotorcharacteristicsthantheACservomotorhard.Oftenusedinlargerpowersystems,suchasservopositioncontrolsystem.ACservomotorapplications:
ACservomotoroutputpowerisgenerally0.1-100W,powerfrequencysub50Hz,400Hzandsoon.Itsapplicationisverybroad,suchasusedinavarietyofautomaticcontrol,thesystemautomaticallyrecords
PLCControllers
1ProgrammingaPLCcontroller
PLCcontrollercanbereprogrammedthroughacomputer(usualway),butalsothroughmanualprogammers(consoles).ThispracticallymeansthateachPLCcontrollercanprogarmmedthroughacomputerifyouhavethesoftwareneededforprogramming.Today’stransmissioncomputersareidealforreprogammingaPLCcontrollerinfactoryitself.Thisisofgreatimportancetoindustry.Oncethesystemiscorrected,itisalsoinportanttoreadtherightprogramintoaPLCagain.ItisalsogoodtocheckfromtimetotimewhetherprograminaPLChasnotchanged.Thishelpstoavoidhazardoussituationsinfactoryrooms(someautomakershaveestablishedcommunicationnetworkswhichregularlycheckprogramsinPLCcontrollerstoensureexecutiononlyofgoodprograms).
AlmosteveryprogramforprogrammingaPLCcontrollerpossessesvarioususefuloptionssuchas:
forcedswitchingonandoffofthesysteminputs/outputs(I/Olines),programfollowupinrealtimeaswellasdocumentingadiagram.Thisdocumengingisnecessarytounderstandanddefinefailuresandmalfunctions.Programmercanaddremarks,namesofinputoroutputdevices,andcommengsthatcanbeusefulwhenfindingerrors,orwithsystemmaintenance.Addingcommentsandremarksenablesanytechnician(andnotjustapersonwhodevelopedthesystem)tounderstandaladderdiagramrightaway.Commengsandremrakscanevenquotepreciselypartnumbersifreplacementswouldbeneeded.Thiswouldspeeduparepairofanyproblemsthatcomeupduetobadparts.Theoldwaywassuchthatapersonwhodevelopedasystemhadprotectionontheprogram,sonobodyasidefromthispersoncouldunderstandhowitwasdone.Correctlydocumentedladderdiagramallowsanytechniciantounderstandthoroughlyhowsystemfunctions.
2Powersupply
Electricalsupplyisusedinbringingelectricalenergytocentralprocessingunit.MostPLCcontrollersworkeitherat24VDSor220VAS.OnsomePLCcontrollersyou’llfindelectricalsupplyasaseparatemodule.ThoseareusuallybiggerPLCcontrollers,whilesmallandmediumseriesalreadycontainthesupplymodule.UserhastodeterminehowmuchcurrenttotakefromI/Omoduletoensurethatelectricalsupplyprovidesappropriateamountofcurrent.Differenttypesofmodulesusedifferentamountsofelectricalcurrent.
Thiselectricalsupplyisusuallynotusedtostartexternalinputsoroutputs.UserhastoprovideseparatesuppliesinstartingPLCcontrollerinputsoroutputsbecausethenyoucanensuresocalled“pure”supplyforthePLCcontroller.Withpuresupplywemeansupplywhereindustrialenvironmentcannotaffectitdamagingly.SomeofthesmallerPLCcontrollerssupplytheirinputswithvoltagefromasmallsupplysourcealreadyincorporatedintoaPLC.
3PLCcontrollerinputs
IntelligenceofanantomatedsystemdepengslargelyontheabilityofaPLCcontrollertoreadsignalsfromdifferenttypesofsensonsandinputdevices.Keys,keyboardsandbyfunctionalswitchesareabasisformanversusmachinerelationship.Ontheotherhand,inordertodetectaworkingpiece,viewamechanisminmotion,checkpressureorfliudlevelyouneedspecificautomaticdevicessuchasproximitysensors,marginalswitchesm,photoelectricsensors,levelsensors,etc.Thus,inputsignalscanbelogical(on/off)oranalogue,SmallerPLCcontrollersusuallyhaveonlydigitalinputlineswhilelargeralsoacceptanalogueinputsthroughspecialunitsattachedtoPLCcontroller.Oneofthemostfrequentanaloguesignalsareacurrentsignalof4to20mAandmillivoltvoltagesignalgeneratedbyvariousensors.SensorsareusuallyusedasinputsforPLCs.Youobtainsensorsfordifferentpurposes.Theycansensepresenceofsomeparts,measuretemperature,pressure,orsomeotherphysicaldimensionm,etc.(ex.Inductivesensorscanregistermetalobjects).
Ot
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