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1、The33rdAnnualConferenceoftheIEEEIndustrialElectronicsSociety(IECON)Nov.5-8,2007,Taipei,TaiwanFaultdetectionbymeansofwavelettransforminaPMSMWunderdemagnetizationJ.Rosero,L.Romeral,J.Cusido,J.A.OrtegaMotionControlandIndustrialApplicationsGroup,TechnicalUniversityofCatalonia.C/Colom.08222Terrassa
2、,Spain,e-mail:romeralgOeel.upcesAbstract-Thispaperpresentsastudyofapermnanentmagnetslowlywithtime.Theshort-timeFouriertransforms(STFT),synchronousmachine(PMSM)runningunderdemagnetization.TheWignerVilleDistribution(WVD),andWaveletTransformdemagnetizationfaultisanalyzedthroughstatorcurrentsanaly
3、sisand(WT)describehowthespectrumofasignalchangeswithprocessingtoolsatdifferentspeeds.Advancedsignalanalysisbytime,andthatisitsmajoradvantage.SuchaninstantaneousmeansofWaveletTransformsispresenited.Simulationswerecarriedoutbyusingtxvodimensional(2-D)finiteelementanalysis(FEA),spectrumisveryusef
4、ulinmanyapplications[6].andresultwerecomparedwithexperimentalones,showingtheInthispaper,aPMSMwithdemagnetizationissimulatedateffectivenessoftheproposedmethodformagletizationfaultdifferentspeedvaluesusingatwo-dimensional(2-D)finitedetectionandidentification.elementanalysis(FEA).Thestatorcurrent
5、sareanalyzedbymeansofcontinuousanddiscreteWaveletTransforms.IndexTerms-PMSMdrives,demagnetizationfault,wavelet,AnindicativefaultparameterisobtainedthroughFFT,finiteelementanalysis.continuousWT(CWT).ThelocalmaximumsusingRidge'sI.INTRODUCTION.methodarecalculatedfromthepreviousCWTandafterthat,Per
6、manentmagnetsynchronousmachines(PMSM)arethelocalmaximumsareaveraged.Inaddition,thedetails'attractiveforavarietyofapplicationsbecauseoftheirhighenergyofdiscreteWaveletTransform(DWT)iscalculatedforpowerdensity,wideconstant-powerspeedrange,andthestatorcufrentofboth,demagnetizedandhealthymachines.
7、excellentefficiency[1].However,faultsineitherthemachineThecurrentisobtainedfromsimulationwithFEA,andorinvertercreatespecialchallengesinanytypeofPMsimulationsarealsocomparedwithexperimentalresults.synchronousmachinedrivebecauseoftheprese
