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1、畢業(yè)設計（外文翻譯材料）學院：電氣與電子工程學院專業(yè)：電子信息工程學生姓名:指導教師：譚博學2008年4月MinimizationandidentificationofconductedemissionbearingcurrentinvariablespeedinductionmotordrivesusingPWMinverterAbstracLTherecentincreaseintheuseofspeedcontrolofacinductionmotorforvariablespeeddriveusingpulsewidthmo
2、dulation(PWM)inverterisduetotheadventofmodempowerelectronicdevicesandintroductionofmicroprocessors.Therearemanyadvantagesofusingacinductionmotorforspeedcontrolapplicationsinprocessandaerospaceindustries,butduetofastswitchingofthemodernpowerelectronicdevices,theparasiti
3、ccouplingproducesundesirableeffects.Theundesirableeffectsincluderadiatedandconductedelectromagneticinterference(EMI)whichadverselyaffectnearbycomputers,electronic/electricalinstrumentsandgiverisetotheflowofbearingcurrentintheinductionmotor.Duetotheflowofbearingcurrenti
4、ntheinductionmotor,electricaldischargemachiningtakesplaceintheinnerraceofthebearingwhichreducesthelifeofthebearing.Inhighpowerconvertersandinverters,theconductedandradiatedemissionsbecomeamajorconcern?Inthispaper,identificationofbearingcurrentduetoconductedemission,the
5、measurementofbearingcurrentinamodifiedinductionmotorandtominimizethebearingcurrentarediscussed.Thestandardcurrentprobe,thestandardlineimpedancestabilizationnetwork(LISN)),theelectronicsinterfacecircuitsareusedtomeasurehighfrequencycommonmodecurrent,bearingcurrentandtom
6、inimizetheconductednoisefromthesystem.TheLISNwillpreventtheEMInoiseenteringthesystemfromthesupplysourcebyconductivemethods,atthesametimepreventstheEMIgeneratedifanyduetoPWM,fastswitchinginthesystem,willnotbeallowedtoenterthesupplyline.ForcomparingtheresultswithFederalC
7、ommunicationsCommission(FCC)andSpecialCommitteeonRadioInterference(CISPR)standards,thegraphsareplottedwithfrequencyVs,linevoltageindB“V,commonmodevoltageindBpVandthebearingcurrentindB/zAwithoutandwithminimizingcircuits?Keywords.EMI;a.c.drives;bearingcurrent.1.Introduct
8、ionWiththedevelopmentofpowerelectronicdevicesliketheinsulatedgatebi-polartransistor(IGBT),thepowerMOSFETandtheadvance
