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1、附录：外文资料翻译AnalysisofNoveIGearIessTractionOilPumpingUnitFrameBasedonUGSoftwareAbstract:hispaperpresentsanovelgearlesstractionoilpumpingunit.ItisdrivedbylowspeedandhightorquePermanentMagnetSynchronousMachines(PMSM)ratherthanasynchronousmotor,whichhasnotreducer
2、.ThemodelofpumpingunitisdesignedbyUnigraphicsNX(UG)software,theprimarypartsarcintroduced,andanalyzedbasedontheFiniteElementMethod(FEM).ThroughtheThirdIntensityTheoryandFEManalysis,structuralsizehowtoaffectintensityofpumpingunitispresented,theresultsshowstha
3、titsintensityisenough.Theadvantageofnovelgearlesstractionoilpumpingunitisalsopresented.Lengthofstrokeis9m,frequencyofstrokeis2/min,theefficiencyis85%above,powerfactoris0.95above・I.INTRODUCTIONPumpingunitismainexploitationmachineryinpetroleumandnaturalgas.Al
4、ongwiththeunceasingdevelopmentofoilfieldexploitation,thefiinctionofpumpingunitismoreandmore・80%productionwellofdomesticoilfieldhaveusedpumpingunit,60%produceliquidquantityand75%produceoilquantityineachoilfieldofnation-wideistoleanpumpingunit[l].Beampumpingu
5、nitisverycommoninoilfieldrightnow.Itismainlycomprisedofasynchronousmotor,wheelofstrap,reducer,rocker,beam.Workprincipleofbeampumpingunitisasynchronousmotorpasspowertoreducerthroughstrap,reducerdrivetorocker,forcebeamtoswitcharoundaxes,realizetheverticalreci
6、procatingsportofpumpingrod[2].Thebeampumpingunithasfollowingafewbiggeneralproblems:(l)Efliciencyofsystemislow.Thetransferframeofbeampumpingunitisasynchronousmotor-wheelofstrap-reducer-rocker-beam-pumpingrod,transmissionchainislongandtransmissionefficiencyis
7、low.Theefficiencyofasynchronousmotorisdirectlyconnectwithload,loadofelectricmotoris40%below,efficiencyofelectricmotoris60%below・Theefficiencyoftransmissionstrapisabout93%,efficiencyofreducerisabout80%,transmissionefficiencyfromrockertobeamisabout90%,so,effi
8、ciencyofbeampumpingunitis50%below.(2)Powerfactorofsystemislow.Beampumpingunitisdrovebyasynchronousmotor,inordertosatisfyingstartingtorque,powergradeofmotoris1-2gradebiggerthancommonpowergrade.Loadchara
