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1、大连交通大学2013届本科生毕业设计（论文）外文翻译外文原文TheRiseOfThePermanent-magnetTractioMotorTechnologyofferingbenefitsintermsofmass,sizeandenergyconsumption,thepermanent-magnetsynchronousmachineisincreasinglybeingadoptedfortractiondrives,despitetheneedforcomplexcontrolsystemsandpotentialfailure
2、modes.Inthepastcoupleofyears,manyofthebidsfornewrollingstockplacedwithmajorinternationalsuppliershaveproposedtheuseofpermanent-magnetsynchronoustractionmotors,whicharesmallerandlighterthanthethree-phaseinductionmotorsthathavedominatedthemarketinrecenttimes.Permanent-magnet
3、motorsfirstcametoprominencewiththeuseoftwopoweredbogiesfromAlstom'sAGVintheV150trainsetwhichbroketheworldspeedrecordonApril32007,buttheyhavesubsequentlybeenusedinavarietyofapplications,rangingfromtheCitadis-Dualistram-traintoSBB'sTwindexxdouble-deckinter-citytrainsets(Tabl
4、eI).Althoughrailwayoperatorsareoftenviewedasconservativeintheadoptionofnewtechnologies,thedesignersandmanufacturersofrailtractionsystemstendtocapitaliseonthelatestdrivetechnologies,whicharerapidlydeployedinserviceiftheypromisesignificantperformanceimprovements.Thiswastheca
5、sefortheearlychopperssupplyingseries-connectedDCtractionmotors,separately-excitedDCmotors,synchronousACmotorsanddrives(asusedonthefirstgenerationsofTGVs)andforthevariousgenerationsofasynchronous(squirrel-cage)three-phasedrives.Astechnologymovedforward,tractiondrivesbecamem
6、oreefficientandmorecontrollable,allowingbetteruseofavailableadhesionwhilereducingenergyconsumption.Thepermanent-magnetsynchronousmachine,withitsassociatedcontrolelectronics,representsthelatestsuchadvanceintractiontechnology.MillionsofsmallPMSMsarealreadybeingusedinthetrans
7、missionsofhybridcars,thankstotheirlowmassandgoodcontrollability.Largermachinesofferasimilarpotentialtoenhancetheoverallperformanceoftherailwaytractionpackage.Thetechnologyisnowbeginningtobeintroducedintoavarietyofnewrollingstock,大连交通大学2013届本科生毕业设计（论文）外文翻译buttheintegrationo
8、fPMSMsintotractionpackagespresentssomesignificanttechnicalchallengeswhichmustbeovercome.F
