电梯曳引机外文翻译文档格式.docx

电梯曳引机外文翻译文档格式.docx

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v—liftspeed（m/s）

D—diameteroftractionmachine（m）

N—motorspeed（r/min）

ίy—tractionratio（tractionmode）

ίj—gearratio

Forexample:

Giventhefactthatsheavediameteroftractionsheaveis0.8m,motorspeedis1500r/min,reductionratiois53:

3,gearratiois2:

1,whatisliftspeed?

D=0.8m，N=1000r/min,ίy=2/1,ίj=53/3

Fromthegivenconditions,welearnthatD=0.8m，N=1000r/min,ίy=2/1,ίj=53/3.Accordingtoabovementionedformula,wecancalculatethat：

Aspowerproviderforliftmovement,tractionmachinefeaturescomplicatedoperationprocedures,amongwhichisinvolvedwithfrequentstart-up,brake,clockwiseandcounterclockwiserotation.Duetoconstantlychangingload,workingstatusoftractionmachineischaracteristicofrepetitiousshorttimeoperation,electricalcontrolandregeneration.Therefore,withlowstart-upcurrent,largestart-uptorque,mechanicallyrigidfeaturesandlownoise,itisrequiredthattractionmachineshouldnotonlybeadaptedforfrequentstart-up,brake,butalsostartupandfunctionwellwhenpoweroltagefluctuateswithinnormalrange.Beingspecialmachineforlift,tractionmachineischaracteristicofcomplicatedoperation,whoseHpcanbecalculatedthroughfollowingformula:

P—shaftHpoftractionmachine（kw）

G—ratedloadofcar（kg）

α—offsettingcoefficient

η—totalmechanicalefficiency

v—liftspeed（m/s）

Forliftwithgearedtractionmachine,ifwormgearisArchimedestype,totalmechanicalefficiencyrangesfrom0.5to0.55;

forliftwithgearlesstractionmachine,totalmechanicalefficiencyrangesfrom0.75to0.8.

ForanACtwo-speedliftwhoseratedloadis2000kgandratedspeedis0.5m/s,wormgearisArchimedestype,ratedspeedofmotoris960r/min,whatishpofmotor?

AccordingtoG=2000kg,α=0.5，v=0.5m/s，η=0.5,wecancalculatebyinputtinggivenvalues.

GearedtractionmachineisclassifiedintoACandDCtypes.W191tractionmachineisACfrequency-variablemotor.Currently,besideswormgearedmachine,bevelandstargearedmachinesarealsoavailable.

Gearlesstractionmachine

Gearlesstractionmachineisusedinliftswithspeedofmorethan2.0m/s.Withtractionsheavefixedinmotorshaft,thistractionmachineissimpleinstructurewithoutanymechanicalgearedmachine.Speciallydesignedformanufacturedforlift,tractionmotorissuitableforliftoperationandclassifiedintospeed-variableDCandfrequency-variableACmotor.

Infigure2-2isshownanACfrequency-variablegearlesstractionmachine.

Thismachineneedsmuchmorebraketorquethangearedmachinewhenitismanufactured,therefore,itneedsaratherbiggerbrake.Gearlesstractionmachineismoreoftenthannotusedincompoundwindingdrive,therefore,forceappliedontractionsheave,compoundwindingsheaveandbearismuchlargerthanthatontractionmachine;

correspondingshaftisoflongerdiameter.

Withnogearedmachine,ithaslongerusagelife.

Permanent–magnetsynchronousgearlesstractionmachine

Wecan’thelpmentioningtheapplicationofpermanent–magnetsynchronousgearlesstractionmachineinlift.Withtherapiddevelopmentoftractiontechnologyinlift,moreandmoreliftswithoutmachineroomareadoptingpermanent–magnetsynchronousgearlesstrailingtechnology.Forliftswithoutmachineroom,thereisnoneedtoenlargewelldimensions,simplifyingandbeautifyingconstruction,savingcost,especiallytheapplicationvalueofsuchliftsisenhancedbylownoise,highefficiencyandpowereconomization,andwhatdistinguishesliftswithoutmachineroomfromothersliesinthepermanent–magnetsynchronousgearlesstractionmachine.

Infigure2-3isshownPMS425ALpermanent–magnetsynchronousgearlesstractionmachineusedinThyssen’sliftswithoutmachineroom.Thetractionmachineisflatinstructure,soonlyaverysmallspaceisneededbetweenwellwallsandcartocompleteinstallation.Withgearlessdesign,motortorquedirectlypassesontotractionsheave,combinedwithstaticfrictionofnon-decelerationpart,drivingefficiencycanexceed90%;

besides,duetolowrotationspeed,tractionmachinerunswithlownoiseandisfreefromvibration.Thetractionmachinehastwomechano-electronicbrakes,therefore,theotherbrakecanprovidesufficientjerkforcetostopcarwith100%ratedloadifonebrakefailstofunction.

Characteristicsofpermanent–magnetsynchronousgearlesstractionmachine:

●Comfortableriding;

●

Lowrunningnoise;

●Highefficiency;

●Lowloadofelectricaldevices;

●Convenientandreliablemaintenance,withoutneedtochangeoil,eliminatingoilleakage;

●Easytoreplaceassembly,withexteriorbrake;

●Widerangeofsettingandinstallationintractionmachine.

Composedofsprings,brakeblockwithliner,brakearmandmagnet-iron,magneticbrakeismostfrequentlyusedintractionmachine,asshowninfigure2-4.Whenmagneticcoilispoweron,brakewillrelease;

whenmagneticcoilispoweroff,brakeblockwillproducetorque,relyingonspringspressedtightlyonbrakegear.

Brakefunction

Brakehastwofunctions:

Incaseofpowercut-off,brakecanmakeliftstopautomatically.Whenbrakeengages,decelerationofliftshouldnotexceedthatproducedbyoverspeedgovernororneededtostopcaronbuffer.

Ifliftisinnormaloperationwithspeedofmorethan1m/s,liftisusuallydeceleratedthroughelectricalcontrolbeforemechanicalbrakeengages.

Whenliftstopsmoving,brakeshouldguaranteethatliftremainsstationaryunder125%~150%ratedload.Brakedoesnotreleaseuntilliftstartsmoving.

Characteristicofbrake

Whenliftruns,i.e.motorispower-on,

brakewillrelease;

whenliftstops,i.e.

motorispower-off,brakewillengage.

Mountingposition

Forgearedlift,brakeismountedbetween

motorandgearedmachine（seefigure2-5）,

i.e.onhigh-speedshaft.

Smallbraketorqueisneededbyhigh-speed

shaft,sothatbrakedimensionscanbe

reduced.

Gearlesstractionmachineadoptsadapter,i.e.isadaptordisketweenmotorandgearedmachine,asshowninfigure2-6.Brakegearisarrangedonwormgearsideinsteadofonmotorside,toensurethatliftcanalsostopincaseofrupturedadapter.

Castintoonewithtractionrope,brakegearofgearlesstractionmachineisdirectlymountedontractionmachineshaft.Asamainsafetypartofliftsystem,brakehasandirectimpactoncomfortablerideandaccurateleveling.Duringliftoperation,toachievecomfortablerideandaccurateleveling,suchfactorscanbeadjustedasbrakereleasetime,brakereleasetimeandbraketorquesize.

Toreducebrakeengage,releasetimeandnoise,itisrequiredthegapbetweentwomagnetsincoilsbeproperratherthantoowide.Thesmallerthegapbetweenbrakeblockandgearis,thebetter.Brakeblockshouldnottouchrotatinggearafterbrakereleases.

Tractionsheave

Tractionsheaveisshowninfigure2-7.

Gearedtractionsheaveislocatedonsideof

gearedmachine.Operatorsstandontheshaft

sideofmotor,facingmotor.Left-placedtractionmachineistheonewithsheaveontheleftofgearedmachine;

whileright-placedtractionmachineistheonewithsheaveontherightofgearedmachine,asshowninfigure2-8.

Tractionsheaveofgearlesstractionisdirectlyconnectedwithmotor.

Tractionmachinesuport

Solderedbycastironorsecionironwithsteelboard,tractionmachinesupportisaseatthatconnectsmotor,brakeandgearedmachine.Partsoftractrionmachinearemountedonthesupport,facilatingtransportaion,installationandadjustment.Whenliftisinstalled,thesupportwillbefastenedontwoparallelH-stellbeamswithdesignatedspecificationthatservetobearweight.

Mainperformanceandapplicationrequirementoftractionmachine

Takegearedtractionforinstance,wewillgiveabriefingontypicalrequirement.

TractionsheavediameterDshouldbemorethan40d（disdiameteroftractionrope）

Tractionsheavediameter

D—Tractionsheavediameterinmm

vs—Tractionroperatedspeedinm/s

i—Gearratio

n—Motorratedspeedinr/min

Foreexample:

Giventhefactthattractionratiois1:

1,ratedspeedis1.75m/s,I=25:

1,n=1326r/min,ropediameteris13mm,whatisdiameteroftractionsheave?

Giventhefactthati=25∶1，n=1326r/min,

Tractionratiois1/1,therefore,liftratedspeedistractionroperatedspeedvs=1.75m/s,

Fillintheformula2-3withthesevalues,

Tractionropediameterd=13mm,so40d=13×

40=520mm

Obviously,630>

520mm

Since630mmtractionmachinediametermeetsD>

40d,aconclusioncanbedrawnthattractionmac