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1、SolvedwithCOMSOLMultiphysics4.3bE-CoreTransformerIntroductionTransformersareelectricalcomponentsthatareusedforpowertransmission.Mosttransformersworkontheprincipleofelectromagneticinduction.Atypicaltransformerconsistsofaprimarycoil,asecondarycoilandaferromagne
2、ticcore.TheprimarycoilreceivestheACelectricalinputsignal.Asaresultofmutualinduction,aninducedvoltageisobtainedacrossthesecondarycoil.Theferromagneticcoreservesthepurposeofamagneticfluxconcentratortherebyminimizinglossesduetofluxleakage.Commercialtransformersu
3、seseveraltypesofcores,whicharenamedbasedontheirgeometricshapes,forexampleI-core,U-core,E-core,potcore,toroidal,andplanar.ThismodelusesapairofE-coresformagneticfluxconcentration.Thismodeldemonstrateshowtoperformtransientsimulationsofasingle-phaseE-coretransfor
4、mer.IncludingtheeffectofanonlinearB-Hcurveinthesoft-ironcore,themodelcomputesthespatialdistributionofthemagneticandelectricfields,themagneticsaturationeffect,thetransientresponse,andthefluxleakagetothesurroundings.Twodifferentversionsofthetransformeraresimula
5、ted:thefirstonewithaturnratioofunityandthesecondonewithaturnratioof1000.ModelDefinitionThecoreofthesingle-phaseE-coretransformerconsideredhereconsistsofapairofE-cores,whichformaclosedmagneticfluxpath.Theprimaryandsecondarycoilsinthetransformerareplacedaroundt
6、hecentrallegofthecoreasshowninFigure1.AnonlinearB-Hcurvethatincludessaturationeffectsisusedtosimulatethemagneticbehaviorofthesoft-ironcore.Hysteresiseffectsinthecoreareneglected.Themodelassumesthattheprimaryandsecondarywindingsaremadeofthinwireandhavemultiple
7、turns.Usingtheassumptionsthatthewirediameterislessthantheskindepthandthattherearemanyturns,thesewindingsaremodeledwithMulti-TurnCoilDomainfeatures.Furthermore,themodeldoesnotaccountforeddycurrentsintheindividualturnsofthecoil.Theprimarywindingisconnectedtoapr
8、imaryresistor,RpandtheACvoltagesource,Vacwhilethesecondarywindingisconnectedtothe©2013COMSOL1
9、E-CORETRANSFORMERSolvedwithCOMSOLMultiphysics4.3bsecondaryloadresistor,RsasshowninFigure2.Iro
