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1、外文原文:PreambleMorethanacentury,electricmotorsasanelectronicandmechanicalenergyconversiondevice,itsapplicationscoverallareasofthenationaleconomyandpeople'sdailylife.Themaintypesofsynchronousmotor,asynchronousmotorandthreekindsofDCmoto匚BecauseofthetraditionalDCmotorusi
2、ngbrushbymechanicalmethodstochange,sothereisarelativelymechanicalfriction,theresultingnoise,cremation,radiointerference,aswellasashorterlife-span,suchasweakness,coupledwithhighmanufacturingcostsandmaintenancedifficultiesdisadvantage,therebygreatlylimitingitsscopeofa
3、pplication,withtheresultthatthemajorityofcurrentindustrialandagriculturalproductionarethree-phaseasynchronousmotorToaddresstheabovedrawbacksofthetraditionalDCmotor,asearlyasthe30sinthelastcentury,somestartedtodevelopanelectronicexchangetoreplacethemechanicalbrushcom
4、mutationofbrushlessDCmotor.Afterdecadesofeffort,untilthelastcentury,theearly60sfinallyrealizethisdesire.Sincethe70soflastcentury,withthepowerelectronicsindustry,therapiddevelopmentofmanyhigh-performancepowersemiconductordevices,suchasGTR,MOSFET,IGBT,IPM,etc.aswellas
5、theadventofhigh・perfonnancepermanentmagnetmaterialsarebrushlessDCmotorwidelyusedtolayasolidfoundation.BecauseofbrushlessDCmotorMotorcommunicatebothsimplestructure,reliableoperation,easymaintenance,suchasaseriesofadvantages,butalsotheoperationofDCmotorwithhighefficie
6、ncy,non-excited,aswellasspeedperformanceandwearandtear,andmanyotheradvantages,itisintoday'snationaleconomyapplicationsbecomeincreasinglypopula匚Three-phasebrushlessDCmotorofthefundamentalcomponentFigure1Three-phasebipolarbrushlessDCmotorcomponentBrushlessDCpermanentm
7、agnetmotormainbodybythemotor,positionsensorsandelectronicswitchingcircuitiscomposedofthreeparts.Itsstatorwindingsgenerallymadeofmulti-phase(three-phase,four-phase,five-phaserange),bythepermanentmagnetrotoraccordingtoacertainnumberofpolepairs(2p=2,4,…)components.Show
8、ninFigure1forthree-phasebipolarbrushlessDCmotorstructure,Three-phasestatorwindings,respectively,withtheelectronicswitchcircuitcorrespondin
