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1、英文翻譯英文翻譯TractionmachineAspowerproviderflifttractionmachinealsocalledmainmachineiscomposedofmotbrakegearedmachineseat.Itisadrivetomakecarmovebymeansofthefrictionbetweentractionropesheave.Accdingtowhetherthegearedmachineis

2、providednotitisclassifiedintogearedgearlesstypes.GearedtractionmachineGearedtractionmachineiswidelyusedincargoliftpassengerliftserviceliftwithspeedofnotmethan2.0ms.Toreducewkingnoiseenhancestabilitywmgearisnmallyusedasge

3、areddrive.Suchmachineiscomposedofmotwmgearbrakeropeseatasshownisfigure21.MainparameterssuchasliftloadspeedaredeterminedbyHpspeedoftractionmachinewmgearnumbersgearratiodiameteroftractionmachineropegroovestractionratio(tra

4、ctionmode).Fliftsadoptinggearedtractionmachinetherelationshipbetweenliftspeedtractiongearratiotractionmachinediametertractionmotspeedisasfollows:Where:v—liftspeed(ms)D—diameteroftractionmachine(m)N—motspeed(rmin)?y—tract

5、ionratio(tractionmode)?j—gearratioFexample:Giventhefactthatsheavediameteroftractionsheaveis0.8mmotspeedis1500rminreductionratiois53:3gearratiois2:1whatisliftspeedD=0.8m,N=1000rmin?y=21?j=533Fromthegivenconditionswelearnt

6、hatD=0.8m,N=1000rmin?y=21?j=533.Accdingtoabovementionedfmulawecancalculatethat:Aspowerproviderfliftmovementtractions75m.1353126014800.814.360???????jyiiπDNvGearlesstractionmachineisusedinliftswithspeedofmethan2.0ms.Witht

7、ractionsheavefixedinmotshaftthistractionmachineissimpleinstructurewithoutanymechanicalgearedmachine.SpeciallydesignedfmanufacturedflifttractionmotissuitablefliftoperationclassifiedintospeedvariableDCfrequencyvariableACmo

8、t.Infigure22isshownanACfrequencyvariablegearlesstractionmachine.Thismachineneedsmuchmebraketquethangearedmachinewhenitismanufacturedtherefeitneedsaratherbiggerbrake.Gearlesstractionmachineismeoftenthannotusedincompoundwi

9、ndingdrivetherefefceappliedontractionsheavecompoundwindingsheavebearismuchlargerthanthatontractionmachinecrespondingshaftisoflongerdiameter.Withnogearedmachineithaslongerusagelife.Permanent–magsynchronousgearlesstraction

10、machineWecan’thelpmentioningtheapplicationofpermanent–magsynchronousgearlesstractionmachineinlift.Withtherapiddevelopmentoftractiontechnologyinliftmemeliftswithoutmachineroomareadoptingpermanent–magsynchronousgearlesstra

11、ilingtechnology.Fliftswithoutmachineroomthereisnoneedtoenlargewelldimensionssimplifyingbeautifyingconstructionsavingcostespeciallytheapplicationvalueofsuchliftsisenhancedby圖22無齒輪曳引機(jī)DAF290Figure22GearlesstractionmachineDA

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