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1、IEEETRANSACTIONSONMAGNETICS,VOL.45,NO.7,JULY20092961DetectionofDemagnetizationFaultsinPermanent-MagnetSynchronousMotorsUnderNonstationaryConditionsJordi-RogerRibaRuiz ,JavierA.Rosero,AntonioGarciaEspinosa,andLuisRomeralElectricalEngineeringDepartment,UPC,EUETII,08700Igualada
2、,SpainElectronicEngineeringDepartment,UPC,08222Terrassa,SpainElectricalEngineeringDepartment,UPC,08222Terrassa,SpainThispaperpresentstheresultsofourstudyofthepermanent-magnetsynchronousmotor(PMSM)runningunderdemagnetization.Weexaminedtheeffectofdemagnetizationonthecurrentspectr
3、umofPMSMswiththeaimofdevelopinganeffectivecondition-moni-toringscheme.Harmonicsofthestatorcurrentsinducedbythefaultconditionsareexamined.Simulationbymeansofatwo-dimensionalfinite-elementanalysis(FEA)softwarepackageandexperimentalresultsarepresentedtosubstantiatethesuccessfulappl
4、icationoftheproposedmethodoverawiderangeofmotoroperationconditions.Methodsbasedoncontinuouswavelettransform(CWT)anddiscretewavelettransform(DWT)havebeensuccessfullyappliedtodetectandtodiscriminatedemagnetizationfaultsinPMSMmotorsundernonstationaryconditions.Additionally,areduce
5、dsetofeasy-to-computediscriminatingfeaturesforbothCWTandDWTmethodshasbeendefined.Wehaveshowntheeffectivenessoftheproposedmethodbymeansofexperimentalresults.IndexTerms—Demagnetization,faultdiagnosis,finite-elementmethods,permanent-magnetsynchronousmotor,processmonitoring,wavelettr
6、ansforms.I.INTRODUCTIONfromoperationorproblemsinheatdissipationcandemagne-tizethemagnet.Underapartialdemagnetization,thestatorcur-rentsarehigherthanthoseofahealthyPMSMoperatingunderERMANENT-MAGNETsynchronousmotors(PMSMs)thesameloadconditions.Consequently,thethermallevelofthePar
7、ebecominghighlypopularinhigh-performanceappli-PMSMincreases[2],[3].cationsincomparisontoothertypesofacmotors.High-speedAlso,aturn-to-turnshort-circuitfaultmaypartiallydemagne-operationandprecisetorquecontrolaresomeoftheiradvanta-tizeasurfacemountmagnet.Theworst-caseconditionisw
8、hengeousfeatures,whichincludeahightorquetocurrentratio
