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1、IEEETRANSACTIONSONMAGNETICS,VOL.45,NO.7,JULY20092961DetectionofDemagnetizationFaultsinPermanent-MagnetSynchronousMotorsUnderNonstationaryConditionsJordi-RogerRibaRuiz ,JavierA.Rosero,AntonioGarciaEspinosa,andLuisRomeralElectricalEngineeringDepartment,UPC,EUETI
2、I,08700Igualada,SpainElectronicEngineeringDepartment,UPC,08222Terrassa,SpainElectricalEngineeringDepartment,UPC,08222Terrassa,SpainThispaperpresentstheresultsofourstudyofthepermanent-magnetsynchronousmotor(PMSM)runningunderdemagnetization.Weexaminedtheeffectofdem
3、agnetizationonthecurrentspectrumofPMSMswiththeaimofdevelopinganeffectivecondition-moni-toringscheme.Harmonicsofthestatorcurrentsinducedbythefaultconditionsareexamined.Simulationbymeansofatwo-dimensionalfinite-elementanalysis(FEA)softwarepackageandexperimentalresul
4、tsarepresentedtosubstantiatethesuccessfulapplicationoftheproposedmethodoverawiderangeofmotoroperationconditions.Methodsbasedoncontinuouswavelettransform(CWT)anddiscretewavelettransform(DWT)havebeensuccessfullyappliedtodetectandtodiscriminatedemagnetizationfaultsi
5、nPMSMmotorsundernonstationaryconditions.Additionally,areducedsetofeasy-to-computediscriminatingfeaturesforbothCWTandDWTmethodshasbeendefined.Wehaveshowntheeffectivenessoftheproposedmethodbymeansofexperimentalresults.IndexTerms—Demagnetization,faultdiagnosis,finite-
6、elementmethods,permanent-magnetsynchronousmotor,processmonitoring,wavelettransforms.I.INTRODUCTIONfromoperationorproblemsinheatdissipationcandemagne-tizethemagnet.Underapartialdemagnetization,thestatorcur-rentsarehigherthanthoseofahealthyPMSMoperatingunderERMANEN
7、T-MAGNETsynchronousmotors(PMSMs)thesameloadconditions.Consequently,thethermalleveloftheParebecominghighlypopularinhigh-performanceappli-PMSMincreases[2],[3].cationsincomparisontoothertypesofacmotors.High-speedAlso,aturn-to-turnshort-circuitfaultmaypartiallydemagn
8、e-operationandprecisetorquecontrolaresomeoftheiradvanta-tizeasurfacemountmagnet.Theworst-caseconditioniswhengeousfeatures,whichincludeahightorquetocurrentratio
