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外文翻译--电梯曳引机.doc

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外文翻译--电梯曳引机.doc

英文翻译TractionmachineAspowerproviderforlift,tractionmachine,alsocalledmainmachine,iscomposedofmotor,brake,gearedmachineandseat.Itisadrivetomakecarmovebymeansofthefrictionbetweentractionropeandsheave.Accordingtowhetherthegearedmachineisprovidedornot,itisclassifiedintogearedandgearlesstypes.GearedtractionmachineGearedtractionmachineiswidelyusedincargolift,passengerliftandserviceliftwithspeedofnotmorethan2.0m/s.Toreduceworkingnoiseandenhancestability,wormgearisnormallyusedasgeareddrive.Suchmachineiscomposedofmotor,worm,gear,brake,ropeandseat,asshownisfigure21.Mainparameters,suchasliftloadandspeedaredeterminedbyHpandspeedoftractionmachine,wormandgearnumbers,gearratio,diameteroftractionmachine,ropegroovesandtractionratiotractionmode.Forliftsadoptinggearedtractionmachine,therelationshipbetweenliftspeed,tractiongearratio,tractionmachinediameter,tractionmotorspeedisasfollowsWherevliftspeed(m/s)Ddiameteroftractionmachine(m)Nmotorspeedr/minίytractionratio(tractionmode)ίjgearratioForexampleGiventhefactthatsheavediameteroftractionsheaveis0.8m,motorspeedis1500r/min,reductionratiois533,gearratiois21,whatisliftspeedD0.8m,N1000r/min,ίy2/1,ίj53/3Fromthegivenconditions,welearnthatD0.8m,N1000r/min,ίy2/1,ίj53/3.Accordingtoabovementionedformula,wecancalculatethatAspowerproviderforliftmovement,tractions/75m.1353126014800.814.360jyiiπDNvmachinefeaturescomplicatedoperationprocedures,amongwhichisinvolvedwithfrequentstartup,brake,clockwiseandcounterclockwiserotation.Duetoconstantlychangingload,workingstatusoftractionmachineischaracteristicofrepetitiousshorttimeoperation,electricalcontrolandregeneration.Therefore,withlowstartupcurrent,largestartuptorque,mechanicallyrigidfeaturesandlownoise,itisrequiredthattractionmachineshouldnotonlybeadaptedforfrequentstartup,brake,butalsostartupandfunctionwellwhenpoweroltagefluctuateswithinnormalrange.Beingspecialmachineforlift,tractionmachineischaracteristicofcomplicatedoperation,whoseHpcanbecalculatedthroughfollowingformulaWherePshaftHpoftractionmachinekwGratedloadofcarkgαoffsettingcoefficientηtotalmechanicalefficiencyvliftspeed(m/s)Forliftwithgearedtractionmachine,ifwormgearisArchimedestype,totalmechanicalefficiencyrangesfrom0.5to0.55forliftwithgearlesstractionmachine,totalmechanicalefficiencyrangesfrom0.75to0.8.ForexampleForanACtwospeedliftwhoseratedloadis2000kgandratedspeedis0.5m/s,wormgearisArchimedestype,ratedspeedofmotoris960r/min,whatishpofmotorAccordingtoG2000kg,α0.5,v0.5m/s,η0.5,wecancalculatebyinputtinggivenvalues.GearedtractionmachineisclassifiedintoACandDCtypes.W191tractionmachineisACfrequencyvariablemotor.Currently,besideswormgearedmachine,bevelandstargearedmachinesarealsoavailable.Gearlesstractionmachine9.8kw0.51020.50.512000102ηαvG1PGearlesstractionmachineisusedinliftswithspeedofmorethan2.0m/s.Withtractionsheavefixedinmotorshaft,thistractionmachineissimpleinstructurewithoutanymechanicalgearedmachine.Speciallydesignedformanufacturedforlift,tractionmotorissuitableforliftoperationandclassifiedintospeedvariableDCandfrequencyvariableACmotor.Infigure22isshownanACfrequencyvariablegearlesstractionmachine.Thismachineneedsmuchmorebraketorquethangearedmachinewhenitismanufactured,therefore,itneedsaratherbiggerbrake.Gearlesstractionmachineismoreoftenthannotusedincompoundwindingdrive,therefore,forceappliedontractionsheave,compoundwindingsheaveandbearismuchlargerthanthatontractionmachinecorrespondingshaftisoflongerdiameter.Withnogearedmachine,ithaslongerusagelife.Permanent–magnetsynchronousgearlesstractionmachineWecanthelpmentioningtheapplicationofpermanent–magnetsynchronousgearlesstractionmachineinlift.Withtherapiddevelopmentoftractiontechnologyinlift,moreandmoreliftswithoutmachineroomareadoptingpermanent–magnetsynchronousgearlesstrailingtechnology.Forliftswithoutmachineroom,thereisnoneedtoenlargewelldimensions,simplifyingandbeautifyingconstruction,savingcost,especiallytheapplicationvalueofsuchliftsisenhancedby图22无齿轮曳引机DAF290Figure22GearlesstractionmachineDAFBrakeMotorTractionsheavelownoise,highefficiencyandpowereconomization,andwhatdistinguishesliftswithoutmachineroomfromothersliesinthepermanent–magnetsynchronousgearlesstractionmachine.Infigure23isshownPMS425ALpermanent–magnetsynchronousgearlesstractionmachineusedinThyssensliftswithoutmachineroom.Thetractionmachineisflatinstructure,soonlyaverysmallspaceisneededbetweenwellwallsandcartocompleteinstallation.Withgearlessdesign,motortorquedirectlypassesontotractionsheave,combinedwithstaticfrictionofnondecelerationpart,drivingefficiencycanexceed90besides,duetolowrotationspeed,tractionmachinerunswithlownoiseandisfreefromvibration.Thetractionmachinehastwomechanoelectronicbrakes,therefore,theotherbrakecanprovidesufficientjerkforcetostopcarwith100ratedloadifonebrakefailstofunction.Characteristicsofpermanent–magnetsynchronousgearlesstractionmachine●Comfortableriding●Lowrunningnoise●Highefficiency●Lowloadofelectricaldevices●Convenientandreliablemaintenance,withoutneedtochangeoil,eliminatingoilleakage●Easytoreplaceassembly,withexteriorbrake●Widerangeofsettingandinstallationintractionmachine.Composedofsprings,brakeblockwithliner,brakearmandmagnetiron,magneticbrakeismostfrequentlyusedintractionmachine,asshowninfigure24.Whenmagneticcoilispoweron,brakewillreleasewhenmagneticcoilispoweroff,brakeblockwillproducetorque,relyingonspringspressedtightlyonbrakegear.

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