Fault Detection by Means of Hilbert–Huang Transform of the Stator Current in a PMSM With Demagnetization

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1、312IEEETRANSACTIONSONENERGYCONVERSION,VOL.25,NO.2,JUNE2010FaultDetectionbyMeansofHilbertHuangTransformoftheStatorCurrentinaPMSMWithDemagnetizationAntonioGarciaEspinosa,JavierA.Rosero,JordiCusido,LuisRomeral,andJuanAntonioOrtega´AbstractThispaperpresentsanovelmethodtodiagn

2、osede-thecouplingbetweenthenonlinearmagneticandelectriccir-magnetizationinpermanent-magnetsynchronousmotor(PMSM).cuits,istakenintoaccountforthemotoranalysistopredicttheSimulationshavebeenperformedby2-Dfinite-elementanalysisinperformancecharacteristicsofasystem,especiallywh

3、entheordertodeterminethecurrentspectrumandthemagneticfluxsystemisunderfaultconditions[11].distributionduetothisfailure.Thediagnosticjustbasedonmotorcurrentsignatureanalysiscanbeconfusedbyeccentricityfail-ThefastFouriertransform(FFT)ofthestatorcurrenthasurebecausetheharmoni

4、ccontentisthesame.Moreover,itcanbeenappliedtodetectdemagnetizationfaultsbyanalyzingspe-onlybeappliedunderstationaryconditions.Inordertoover-cificharmonics.However,itcannotbeappliedtononstationarycomethesedrawbacks,anovelmethodisusedbaseduponthesignals.Moreover,FFTanalysisc

5、annotdifferentiateharmonicsHilbertHuangtransform.Itrepresentstime-dependentseriesinaduetodemagnetizationfromothersduetoeccentricity[1],[12].2-Dtimefrequencydomainbyextractinginstantaneousfrequencycomponentsthroughanempirical-modedecompositionprocess.Timefrequencyanalysism

6、ethodshavebeenusedfornon-Thistoolisappliedbyrunningthemotorundernonstationarystationarysignalfeatureextraction,althoughsuccessfulappli-conditionsofvelocity.Theexperimentalresultsshowthereliabilitycationofthesetechniquesrequiresunderstandingoftheirre-andfeasibilityofthemet

7、hodologyinordertodiagnosethedemag-spectivelimitations.TheselectionofasuitablewindowsizeisnetizationofaPMSM.requiredwhenapplyingtheshort-timeFouriertransform(STFT)IndexTermsDemagnetization,empirical-modedecompositiontomatchwiththespecificfrequencycontentofthesignal,which(EM

8、D),faultdiagnosis,finite-elementanalysis(FEA),Hilbertisgenerallynotknownapriori.Moreover,thereisa