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1、BehaviorofaFive-PhaseSurface-MountedPermanentMagnetMotorunderMagnetDemagnetizationDomenicoCasadei,MicheleMengoni,GiovanniSerra,AngeloTani,LucaZarriFAbstract–TheconditionmonitoringofmagnetsstatusinAsamatteroffact,suchademagnetizationproducesapermanentmagnetsynchronousmotorsiscriticalforindustrialr
2、eductionofthepolearcleadingtoavariationoftheapplications,andthenitisreceivingmoreandmoreattention.harmoniccontentinthefluxlinkageandthusintheback-Multiphasemotordrivesareanattractivetechnologyforhighemf.powerapplications.TheyhavemanydegreesoffreedomthatTheconsequenceisanirreversibledegradationoft
3、hecanbeusedformanypurposes,suchaspowerdensityimprovement,monitoring,andsoon.Inthispaper,amotorperformanceandefficiency[3].Inordertoavoidcharacterizationofrotorfaultsforfive-phasesurface-mountedtheseproblems,themonitoringofmagnetsstatusispermanentmagnetsynchronousmotorsispresented.Theessential.con
4、sideredrotorfaultisthedemagnetizationoftherotorTheonlinedetectionofrotormagnetdemagnetizationformagnettrailingedges,duetolargestatorcurrents.Thenon-three-phasePMSMshasbeenalreadystudiedinseveralinvasivedetectionmethodisbasedonaFouriertransformofpapers,usingmotorcurrentsignatureanalysis,rotorfluxt
5、heback-emfinducedinthea-bplanes,andexploitsthelargeestimation,ortorqueconstantaveragevalue[4]–[6].numberofdegreesoffreedomofamultiphasemotordrive.TheproposedapproachisvalidatedbymeansofafiniteelementIn[7],theharmoniccontentvariationoftheback-emfhasanalysis.beenanalyzedfordifferentstatorwindingarr
6、angements.ThisvariationcanbedirectlydetectedbyacquiringandIndexTerms--Demagnetization,Faultdiagnosis,PermanentprocessingthePWMmodulatingsignalsatzerocurrentmagnetmachines,Torquecontrol,Variablespeeddrives.references.Inthispaper,thespectraofthespacevectorsofback-emfI.INTRODUCTIONofafive-phasesurfa
7、ce-mountedPMSM,inhealthyandfaultMULTIPHASEmotordrivesareanemergingconditions,havebeenderivedbymeansofanewtechnology,whichnowadaysrepresentsanattractivemathematicalmodelofthemachinethattakesintoaccountopportunity,partic
