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1、ProceedingofInternationalConferenceonElectricalMachinesandSystems2007,Oct.8~11,Seoul,KoreaAnalysisofforcesoncoilendsofformedstatorwindingsYujingLiuDepartmentofPowerTechnologies,ABBAB,CorporateResearch,72178Västerås,SwedenStigHjärneDepartmentofTurbo-g
2、enerator,AlstomPower,72176Västerås,SwedenAbstract—Anend-windingmodelin3DFEMisbuiltforinvestigationofmagnitudes,distributions,andvariationsoftheII.3DFEMMODELelectromagneticforcesoncoilendsofformedstatorwindingunderbothloadandshort-circuit.Theresultsfr
3、omtheA.Examplemachinecalculationsonaturbo-generatorundernominalloadshowthatTheinvestigatedmachineisa2-polesturbo-generatortheradialforcevariesverymuchincircumferentialdirectionandalwaystendstoexpandthestatorwindings.Theforcesbetweeninstalledinanuclea
4、rpowerstationinSweden.differentcoilscanbeeitherattractingorrepellent,whichdepends1)Rateddata:apparentpowerSn=635MVA;voltageUn=onthephasesofthecoils.Inthesudden3-phaseshort-circuit,the21.5kV;statorcurrentIn=17.05kA;powerfactorcos=maximumpositivetorqu
5、eismorethan20timeshigherthaninthe0.85;fieldcurrentIfn=7.59kA.ratedcaseandthetotaltorqueoncoilendscanreach15%ofthe2)Machineparameters:numberofstatorslotsQ1=30;mainratedtorqueofthemachine.Themaximumofforcesononeof10supportboltsintheexamplemachinemayrea
6、ch52kNatastatorwindingpitchY1=12;numberofrotorslotsQ2=24.halfperiodaftershort-circuiting.Thesupportingandfasteningsystemoncoilendsconsistofthreecategories(Fig.1).·10thicksupportingboltsarecircumferentiallyI.INTRODUCTIONplacedagainstradialforce.Indesi
7、gnoflarge-scaleelectricalmachines,forexample,·Manyfasteningboltsareusedtokeepthetopcoilsturbo-generatorsorotherlargesynchronousmachines,toandthebottomcoilstogether.Therearefillingproperlydimensionthesupportingandfasteningsystemismaterialsbetweenthese
8、twolayersofcoils.alwaysanimportanttaskinordertopreventend-windings·Inthestraightparts,justoutofthelaminatedstatorfromriskyvibrationatnormaloperationandwindingdamagecore,somekindoffasteningisusedtoholdcoilsatfaultcases[1-2].againsttangentialforce.Inmo
