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1、IEEETRANSACTIONSONAPPLIEDSUPERCONDUCTIVITY,VOL.20,NO.3,JUNE20101085DynamicPermanentMagnetFluxEstimationofPermanentMagnetSynchronousMachinesXiXiao,Member,IEEE,ChangmingChen,andMengZhangAbstract—Thispaperdealswithrotorfluxestimationinperma-processthatwhen
2、thetemperaturedecreasesandthefluxdensitynentmagnetsynchronousmotor(PMSM).Inmostapplication,theandcoercivitywillreturntoitsoriginalvalue[4].Thevariationrotorfluxlinkageistreatedasaknownconstant.Howeverahighinresidualfluxdensityofthemagnet,alongwiththevaria
3、tionoperationtemperatureorastatorwindingcurrentimpulsemayinarmatureresistanceofthemotorwithtemperature,influencescausemagnetfluxrippleordemagnetizationwhichhasdirectim-pactonmachinesperformance.Toestimatethemagnitudeofrotorthetorquecapabilityandpowereffic
4、iencyofthePMmotor.fluxinthispaperKalmanfilterisusedwhichchoosesstatorcur-WhentheoperatingtemperatureofthemagnetincreasesrentsandPMfluxasstatevariables.Theestimationmethodcanaboveacriticaltemperature,itwillresultinirreversibledemag-trackthedistributionofPM
5、fluxcorrectlyandisrobusttomotornetizationofthemagnet.Oncethishappens,thefluxdensityparametersuncertainty.Thefluxlinkageharmonicscanbede-willnotgobacktoitsoriginalvalueasthetemperaturede-rivedfromthebackEMFsbymeansofFFTanalysis.Thismethodcanbeusedtoanalyse
6、themagnetfluxrippleanddemagnetizationcreases.ThecriticaltemperatureatwhichpointtheirreversibleinPMSM.Thesimulationandexperimentalresultsshowtheeffec-demagnetizationoccursisafunctionofthemagnetandtheloadtivenessoftheproposedrotorfluxestimationmethod.opera
7、tingcurveofthemagnet.AhighoperationtemperatureIndexTerms—EKF,fluxestimation,magnetdemagnetization,ofastatorwindingcurrentimpulsemaycausemagnetfluxPMSM.rippleordemagnetization,whichhasdirectimpactonmachineperformance[5],[6].Inamotortorquecontrolsystem,onc
8、edemagnetizationhap-I.INTRODUCTIONpens,greatercurrentthanthemotorratedvalueflowsintothestatorwindinginordertogeneratethesameloadtorquewhenECENTLY,permanentmagnetsynchronousmotoratnormalcondition.Consequently,thethermalleveloftheop-R(PMSM
