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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,despitetheneedforcomplexcontrolsystemsandpotentia
2、lfailuremodes.Inthepastcoupleofyears,manyofthebidsfornewrollingstockplacedwithmajorinternationalsuppliershaveproposedtheuseofpermanent-magnetsynchronoustractionmotors,whicharesmallerandlighterthanthethree-phaseinductionmotorsthathavedominatedthemarketinrecenttimes.
3、Permanent-magnetmotorsfirstcametoprominencewiththeuseoftwopoweredbogiesfromAlstom'sAGVintheV150trainsetwhichbroketheworldspeedrecordonApril32007,buttheyhavesubsequentlybeenusedinavarietyofapplications,rangingfromtheCitadis-Dualistram-traintoSBB'sTwindexxdouble-deck
4、inter-citytrainsets(TableI).Althoughrailwayoperatorsareoftenviewedasconservativeintheadoptionofnewtechnologies,thedesignersandmanufacturersofrailtractionsystemstendtocapitaliseonthelatestdrivetechnologies,whicharerapidlydeployedinserviceiftheypromisesignificantperf
5、ormanceimprovements.Thiswasthecasefortheearlychopperssupplyingseries-connectedDCtractionmotors,separately-excitedDCmotors,synchronousACmotorsanddrives(asusedonthefirstgenerationsofTGVs)andforthevariousgenerationsofasynchronous(squirrel-cage)three-phasedrives.Astech
6、nologymovedforward,tractiondrivesbecamemoreefficientandmorecontrollable,allowingbetteruseofavailableadhesionwhilereducingenergyconsumption.Thepermanent-magnetsynchronousmachine,withitsassociatedcontrolelectronics,representsthelatestsuchadvanceintractiontechnology.M
7、illionsofsmallPMSMsarealreadybeingusedinthetransmissionsofhybridcars,thankstotheirlowmassandgoodcontrollability.Largermachinesofferasimilarpotentialtoenhancetheoverallperformanceoftherailwaytractionpackage.Thetechnologyisnowbeginningtobeintroducedintoavarietyofnewr
8、ollingstock,大连交通大学2013届本科生毕业设计（论文）外文翻译buttheintegrationofPMSMsintotractionpackagespresentssomesignificanttechnicalchallengeswhichmustbeovercome.F
