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1、畢業(yè)設(shè)計（外文翻譯材料）學(xué)院：專業(yè)：學(xué)生姓名：指導(dǎo)教師：電氣與電子工程學(xué)院電子信息工程譚博學(xué)2008年4月外文翻譯（原文）MinimizationandidentificationofconductedemissionbearingcurrentinvariablespeedinductionmotordrivesusingPWMinverterAbstract.Therecentincreaseintheuseofspeedcontrolofacinductionmotorforvariablespeeddriveusingpulsewidthmodulation(P
2、WM)inverterisduetotheadventofmodernpowerelectronicdevicesandintroductionofmicroprocessors.Therearemanyadvantagesofusingacinductionmotorforspeedcontrolapplicationsinprocessandaerospaceindustries,butduetofastswitchingofthemodernpowerelectronicdevices,theparasiticcouplingproducesundesirable
3、effects.Theundesirableeffectsincluderadiatedandconductedelectromagneticinterference(EMI)whichadverselyaffectnearbycomputers,electronic/electricalinstrumentsandgiverisetotheflowofbearingcurrentintheinductionmotor.Duetotheflowofbearingcurrentintheinductionmotor,electricaldischargemachining
4、takesplaceintheinnerraceofthebearingwhichreducesthelifeofthebearing.Inhighpowerconvertersandinverters,theconductedandradiatedemissionsbecomeamajorconcern.Inthispaper,identificationofbearingcurrentduetoconductedemission,themeasurementofbearingcurrentinamodifiedinductionmotorandtominimizet
5、hebearingcurrentarediscussed.Thestandardcurrentprobe,thestandardlineimpedancestabilizationnetwork(LISN)),theelectronicsinterfacecircuitsareusedtomeasurehighfrequencycommonmodecurrent,bearingcurrentandtominimizetheconductednoisefromthesystem.TheLISNwillpreventtheEMInoiseenteringthesystemf
6、romthesupplysourcebyconductivemethods,atthesametimepreventstheEMIgeneratedifanyduetoPWM,fastswitchinginthesystem,willnotbeallowedtoenterthesupplyline.ForcomparingtheresultswithFederalCommunicationsCommission(FCC)andSpecialCommitteeonRadioInterference(CISPR)standards,thegraphsareplottedwi
7、thfrequencyVs,linevoltageindBμV,commonmodevoltageindBμVandthebearingcurrentindBμAwithoutandwithminimizingcircuits.31外文翻譯（原文）Keywords.EMI;a.c.drives;bearingcurrent.1.IntroductionWiththedevelopmentofpowerelectronicdevicesliketheinsulatedgatebi-polartransistor(IGBT),thepower
