皮带输送机的驱动外文文献翻译中英文翻译.docx

皮带输送机的驱动外文文献翻译中英文翻译.docx

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皮带输送机的驱动外文文献翻译中英文翻译

外文资料

Beltconveyordrive

Reducedvoltagestartingwithincreaseoftransmittingadrivingpower,duringtheaccelerationcontrolwindingrotorinductionmotoraroundtherotorinductionmotordirectlyconnectedtothedrivingsystem;directcurrent（DC）motortransportmostdriveusingaDCshuntmotor;1.2hydrauliccoupler;hydrodynamiccouplingdeviceisoftenreferredtoashydrauliccoupler,consistsofthreebasicsingle;betweentheshaftandthedrivenshaftdon'tneedanymechanicalconnection;afixedchargehydrauliccouplerfixedchargehydrauliccouplerisinthestructureissimple;thevariablefilledhydrauliccouplerisalsoknownforthemomenttypehydrauliccoupler;spooncontrolofhydrauliccoupling

ThebuckstartswiththeincreaseofthetransmissiondrivepowerintheDuringaccelerationcontrolmotortorquebecomesmoreandmoreimportant.Becausethemotortorqueisafunctionofthevoltage,thevoltageappliedtothemotormustbeundercontrol,generalwithsiliconcontrolledrectifier（SCR}abuckstart-updevice,sincereandlowvoltagetensionconveyorbelt,andlinearincreaseinsupplyvoltageuntilthefullvoltageandmaximumspeed.Howeverthisstartinginawaythatdoesnotproducestableacceleration,whentheaccelerationiscompleted,themotorvoltageoftheSCRcontrollockintheguide,themotorprovidesfullpressure.Suchcontrolpowercanreach750kW.

WoundrotorinductionmotorwindingrotorinductionmotordirectlyconnectedtothedrivesystemReducerthroughintherotorwindingsofthemotorinseriesresistancetorquecontrolofmotor.Inatthestartofatransmissiondevice,theresistorinseriesintherotortogeneratealowtorque,whentheconveyorbeltspeed,theresistanceisgraduallyreducedsteadilyincreasingtorque.Inmultidrivesystem,anadditionalslipresistancemaywillalwaysbeconnectedinseriesinthecircuitofrotorwindingtohelploadsharing.Themotorsystemdesignisrelativelysimple,butthecontrolsystemmayverycomplex,becausetheyarebasedonthecomputercontroloftheresistiveswitching.Nowadays,themajoritycontrolsystemiscustomdesignedtomeetthespecificationsoftransmissionsystemaroundtherotormotorissuitablefor400KVVabovethesystem.

Drivedirectcurrent（DC）motortransportmostuseDCshuntmotor,themotorarmatureintheexternalconnection.ControlledDCdrivetechniqueisgenerallyusedforSCRdevice,whichallowscontinuousvariablespeedoperationofDCdrivesysteminmachineryissimple,butdesignofelectroniccircuits,monitoringandcontrolthewholesystem,comparedtoothersoftstartsystemisexpensive,butintorque,loadsharingandtransmissionforthemainconsiderationoccasions,itisareliable,savingthecostoftheDCmotorgeneraluseinlargerpowerconveyingdevice,includingshouldplaytheconveyingbelttensioncontrolofmultidriveDynamicsystemsandtransmissiondevicesthatrequireawiderangeoftransmission.

Hydrodynamiccouplingisoftenreferredtoasthehydrauliccoupler,consistsofthreebasicunits:

astheimpellerofthecentrifugalpump,promotehydraulicturbineandputintotheshellofthetwopowercomponents.Fluidfromtheimpellertotheturbine,onthedrivenshafttorque.Torqueandspeedbecauseofthecirculatingfluidindriving

Shaftandthedrivenshaftdoesnotneedanymechanicalconnection.Thisconnectionpowergeneratedbythedecisiontohydrauliccouplingofthefillingquantity,thetorqueisproportionaltotheinputspeed.Becauseinthefluidcouplingoutputspeedlessthantheinputrate,thedifferencetherebetweensaidtoslip,generally1%-3%.Transmissionpowerofuptoseveralthousandkilowatts.

Afixedchargehydrauliccouplerfixedchargehydrauliccouplerisinrelativelysimpleinstructureandhasonlylimitedthebendingpartoftheconveyingdevicemostcommonlyusedsoftstartdevice,thestructureisrelativelysimpleandlowcost,canprovideexcellentsoftstarteffectonnowusemostoftheconveyor.

Variablefilledhydrauliccoupler,alsoknownastorquehydrauliccouplerlimited.CouplingoftheimpellerinstalledintheACmotor,turbineisinstalledonthedrivengearforhigh-speedshafton,containingtheoperatingcomponentsoftheaxleboxisinstalledonthedrivingbase.CouplingtherotatingshellwithanoverflowoutletallowtheliquidtocontinuouslyfromtheworkingchambermidstreamIntoaseparateauxiliarychamber,oilfromtheauxiliarychamberthroughaheatexchangerpumptocontrolelectromagneticvalveofcouplerfillingliquidquantity.InordertocontrolthestartingtorqueofthesinglemotordrivingsystemmustbemonitoringofACmotorcurrenttothesolenoidvalvecontrolprovidefeedback.Variablefilledhydrauliccouplercanbeusedinpowerdeliverysystemandthepowercanreachthousandsofkilowattsthedriveisverycomplexbothinmechanical,orelectricaldrivingsystematmoderatecost.

Spoonpipecontrolhydrauliccouplerisalsoknownforthevariablespeedfluidcouplings.Thishydrauliccouplerisalsobythreestandardcouplingunitform,i.e.,animpeller,aturbineandaAhousingcontainingloop.Thishydrauliccouplerneedoutsidetheworkingchambersettingcatheter（alsoknownasspoonpipe）andluminalandrelyonadjustingdevicetochangethespoonpipeopening（scooptubeandthetopendoftherotationoftheshellofspacing）artificiallychangetheworkingcavityofthefillingquantity,soastorealizetheoutputspeedregulation.Thiscontrolprovidesareasonablysmoothacceleration,butthecomputercontrolsystemisverycomplex.Spoonpipecontrolhydrauliccouplercanbeusedinsingleormultiplemachinedrivesystem,powerrangefor150kW-750kW.

Variablefrequencycontrol

Variablefrequencycontrolisalsoadirectdrivemode,ithasaveryuniquehighperformance.VFCDeviceforinductionmotorwithchangesinthefrequencyandvoltage,excellentstartingtorqueandacceleration.VFCequipmentisapowerelectroniccontroller,firstofall,theACisrectifiedintoDC,thenusingtheinverter,thentransformstheDCfrequency,drivingvoltagecontrollableAC.VFCadoptsvectorcontrolordirecttorquecontrol（DTC）technology,canaccordingtodifferentloadwithdifferentspeed.VFCdrivingenergyaccordingtothegivenscurvesstartorstop,toachieveautomatictrackingstartedorstoppedcurve.VFCdriveforconveyingbeltstartedtoprovideexcellentcontrolofspeedandtorque,alsocanforthemultimachinedrivesystemForloadsharing.VFCcontrollercanbeeasilyinstalledontheconveyordrivepowerissmall.Pastwheninhighvoltage,VFCdevicestructureduetothepowersemiconductordevicesratedvoltagevaluerestrictionsbecomeverycomplex,highvoltagetransmissionoftenuselow-voltageinverter,andthenusethestep-uptransformerattheoutput,orusingapluralityoflowvoltageinverterinseriestosolve.Andsimpledeviceseriesconnectionoftwolevelinvertersystemcomparedduetotheseriesbetweendeviceseasilypressureandoutputcanbeabetterharmoniccharacteristics,threelevelvoltagetypePWIinvertersysteminseveralmegawattsindustrialtransmissioninrecentyearswon750kW/systemhasbeensuccessfullyinstalledinthebeltconveyordrivesystemofthelong271mtwointhecoalmineofthree2.3kvVFC.

NeutralpointthreelevelinverterusingIGBT

Duetotandemdevicevoltagesharingeasy,lowdeviceeachtimetheswitchofDV/dtandoutputgoodharmonicperformance,thethree-levelvoltageinverterinhighpowerdriveapplicationsbecomemoreandmorepopular.VoltageIGBT（HV-IGBT）makesapplicationofthree-levelneutralpointboxhaveaprincipleofhigh-voltageinverterdesignGreaterscopeofapplication.Thisinvertercannowbeachievedfrom2.RVto4.16Kvfullscopeofapplication.HV-IGBTmoduleseriescanbeusedin3.RVand4.16Kvequipments2.AVeachinverterswitchonlyneedsaHV-IGBT[2,3].

Mainpowerinvertercircuit

HighvoltageACdriveapplications.Comparedwithatwo-levelvoltagetypeinverter,three-levelmidpointboxvoltagetypeinverterprovidesthreevoltagelevelstotheoutputterminal,forthesamequalityofoutputcurrent,theswitchingfrequencycanbereducedtotheoriginal1/4,theswitchingdevicesofratedvoltageS2us4uandS3uandS2uS1utrunkadditionalvaluecanbereducedtotheoriginal1/2,attachedtothemotortransientvoltagestressmayalsobereducedtotheoriginal1/2.ThreelevelneutralpointvoltagetypeinverterswitchstatecanbesummarizedinTable1,u,VandWrespectivelyrepresentsthree,P,NandGisaDCbusthreepoints.Forexample,whentheswitchisclosed,uareinastateofP（positivebusbarvoltage）,onthecontrary,whentheswitchisclosed,uareinastateofn（negativebusvoltage）.Intheneutralcase,thephaseintheostate,thenonthebasisofthephasecurrentpolarityispositiveornegative,orconductionorsInordertoensurethattheneutralpointvoltageisbalanced,theaveragecurrentinjectedattheopointshouldbezeroat3U.

Ascommonlyused12pulsedioderectifiertotheDClinkcapacitorcharging,introducedattheinputendoftheharmonicisverysmall.Iftheinputharmonichavehigherrequirements,usinga24pulsedioderectifierasinputconverter.Theneedtohavetheabilitytoregeneratemoreadvanced,youcanuseanactiveinputconverterinsteadofdioderectifierandtheninputrectifierandinverteroutputforthesamestructure.

Invertercontrol

MotorcontrolledinductionmotorcontrolcanbeusedinrotorfieldorientedvectorcontrolIsimplementedthroughtheuseofPWMmodulatorcompletedtheconstanttorqueandhighspeedinthefieldweakeningregion.Figure2showstheindirectvectorcontrolblockdia