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1、AnalysisofDemagnetizationFaultsinSurface-MountedPermanentMagnetSynchronouswithInter-turnsandPhase-to-GroundShort-Circuits1211J.Urresty,J.Riba,L.RomeralandH.SaavedraAbstract–Demagnetizationfaultsaretroublesomeincircuitsmayinitiateoratleastincreasethefaulteffects,andasp
2、ermanentmagnetsynchronousmotorssincetheymaygreatlyaconsequencethepermanentmagnetoperationpointmayshiftreducetheirperformanceandefficiency.Additionally,the*belowtheirreversibledemagnetizationregion[8].Furthermore,temperatureofthemagnetsdeeplyinfluencestheremanentfluxwh
3、enthepartialdemagnetizationoccurs,currentshigherthandensity.Hence,thetemperaturemayhaveademagnetizationeffectonthemagnets.Thisworkstudiesthebehaviorofasurface-theratedonearerequiredtoflowthroughthestatorwindingsmountedpermanentmagnetsynchronousmotorrunningunderforprod
4、ucingtheratedtorque.Thisleadsthemagnetoperatinginter-turnandphase-to-groundshort-circuitsfaults.Concretely,pointtochange,thusincreasingthefaultseverity[9].thetemperatureincreaseofsuchfaultsandapotentialreversibleInthisworkaSPMSMisanalyzedwhenoperatingunderorirreversib
5、ledemagnetizationoftherotormagnetsareanalyzed.healthyandfaultyconditions.ThefaultyconditionsanalyzedTheanalysisisbasedon2DFEMsimulationswhichincludesrotorincludestatorinter-turnsandphase-to-groundshort-circuits.magnetskew.ThesimulationsconductedinthisworkclearlyshowTh
6、ethermaleffectsofsuchfaultsarestudied,especiallythethatinter-turnfaultsdonotleadtoirreversibledemagnetization.changeintheoperatingpointofthepermanentmagnets.FromHowever,incaseofaphase-to-groundshort-circuitanirreversiblethisinformationitisalsoanalyzedwhetheranirrevers
7、ibledemagnetizationmaytakeplaceinstantaneously.demagnetizationisfeasiblebecauseoftheoccurrenceofsuchfault.TheanalysesweremadebymeansofFEMsimulations,IndexTerms–Permanentmagnetsynchronousmachines,demagnetization,short-circuit,finiteelementsanalysis,simulation,whichhave
8、intoaccountskewedrotorgeometries[10].faultdiagnosis.II.2D-FEMMODELOFTHESPMSMI.INTRODUCTIONTheresultspresentedinthisworkarema
