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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,despitetheneedforcomplexcontrolsystemsandpotentialfailuremodes.In
2、thepastcoupleofyears,manyofthebidsfornewrollingstockplacedwithmajorinternationalsuppliershaveproposedtheuseofpermanent-magnetsynchronoustractionmotors,whicharesmallerandlighterthanthethree-phaseinductionmotorsthathavedominatedthemarketinrecenttimes.Permanent-magnetmotorsfirstcamet
3、oprominencewiththeuseoftwopoweredbogiesfromAlstom'sAGVintheV150trainsetwhichbroketheworldspeedrecordonApril32007,buttheyhavesubsequentlybeenusedinavarietyofapplications,rangingfromtheCitadis-Dualistram-traintoSBB'sTwindexxdouble-deckinter-citytrainsets(TableI).Althoughrailwayopera
4、torsareoftenviewedasconservativeintheadoptionofnewtechnologies,thedesignersandmanufacturersofrailtractionsystemstendtocapitaliseonthelatestdrivetechnologies,whicharerapidlydeployedinserviceiftheypromisesignificantperformanceimprovements.Thiswasthecasefortheearlychopperssupplyingse
5、ries-connectedDCtractionmotors,separately-excitedDCmotors,synchronousACmotorsanddrives(asusedonthefirstgenerationsofTGVs)andforthevariousgenerationsofasynchronous(squirrel-cage)three-phasedrives.Astechnologymovedforward,tractiondrivesbecamemoreefficientandmorecontrollable,allowing
6、betteruseofavailableadhesionwhilereducingenergyconsumption.Thepermanent-magnetsynchronousmachine,withitsassociatedcontrolelectronics,representsthelatestsuchadvanceintractiontechnology.MillionsofsmallPMSMsarealreadybeingusedinthetransmissionsofhybridcars,thankstotheirlowmassandgood
7、controllability.Largermachinesofferasimilarpotentialtoenhancetheoverallperformanceoftherailwaytractionpackage.Thetechnologyisnowbeginningtobeintroducedintoavarietyofnewrollingstock,大连交通大学2013届本科生毕业设计（论文）外文翻译buttheintegrationofPMSMsintotractionpackagespresentssomesignificanttechnic
8、alchallengeswhichmustbeovercome.F
