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1、外文原文:PreambleMorethanacentury,electricmotorsasanelectronicandmechanicalenergyconversiondevice,itsapplicationscoverallareasofthenationaleconomyandpeople'sdailylife.Themaintypesofsynchronousmotor,asynchronousmotorandthreekindsofDCmoto匚BecauseofthetraditionalDCmotorusingbrushbymecha
2、nicalmethodstochange,sothereisarelativelymechanicalfriction,theresultingnoise,cremation,radiointerference,aswellasashorterlife-span,suchasweakness,coupledwithhighmanufacturingcostsandmaintenancedifficultiesdisadvantage,therebygreatlylimitingitsscopeofapplication,withtheresultthat
3、themajorityofcurrentindustrialandagriculturalproductionarethree-phaseasynchronousmotorToaddresstheabovedrawbacksofthetraditionalDCmotor,asearlyasthe30sinthelastcentury,somestartedtodevelopanelectronicexchangetoreplacethemechanicalbrushcommutationofbrushlessDCmotor.Afterdecadesofe
4、ffort,untilthelastcentury,theearly60sfinallyrealizethisdesire.Sincethe70soflastcentury,withthepowerelectronicsindustry,therapiddevelopmentofmanyhigh-performancepowersemiconductordevices,suchasGTR,MOSFET,IGBT,IPM,etc.aswellastheadventofhigh・perfonnancepermanentmagnetmaterialsarebr
5、ushlessDCmotorwidelyusedtolayasolidfoundation.BecauseofbrushlessDCmotorMotorcommunicatebothsimplestructure,reliableoperation,easymaintenance,suchasaseriesofadvantages,butalsotheoperationofDCmotorwithhighefficiency,non-excited,aswellasspeedperformanceandwearandtear,andmanyotheradv
6、antages,itisintoday'snationaleconomyapplicationsbecomeincreasinglypopula匚Three-phasebrushlessDCmotorofthefundamentalcomponentFigure1Three-phasebipolarbrushlessDCmotorcomponentBrushlessDCpermanentmagnetmotormainbodybythemotor,positionsensorsandelectronicswitchingcircuitiscomposedo
7、fthreeparts.Itsstatorwindingsgenerallymadeofmulti-phase(three-phase,four-phase,five-phaserange),bythepermanentmagnetrotoraccordingtoacertainnumberofpolepairs(2p=2,4,…)components.ShowninFigure1forthree-phasebipolarbrushlessDCmotorstructure,Three-phasestatorwindings,respectively,wi
8、ththeelectronicswitchcircuitcorrespondin
