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1、IEEETRANSACTIONSONAPPLIEDSUPERCONDUCTIVITY,VOL.20,NO.3,JUNE20101085DynamicPermanentMagnetFluxEstimationofPermanentMagnetSynchronousMachinesXiXiao,Member,IEEE,ChangmingChen,andMengZhangAbstract—Thispaperdealswithrotorfluxestimationinperma-processthatwhenthetemperaturedecreasesandthe
2、fluxdensitynentmagnetsynchronousmotor(PMSM).Inmostapplication,theandcoercivitywillreturntoitsoriginalvalue[4].Thevariationrotorfluxlinkageistreatedasaknownconstant.Howeverahighinresidualfluxdensityofthemagnet,alongwiththevariationoperationtemperatureorastatorwindingcurrentimpulsemayi
3、narmatureresistanceofthemotorwithtemperature,influencescausemagnetfluxrippleordemagnetizationwhichhasdirectim-pactonmachinesperformance.ToestimatethemagnitudeofrotorthetorquecapabilityandpowerefficiencyofthePMmotor.fluxinthispaperKalmanfilterisusedwhichchoosesstatorcur-Whentheoperating
4、temperatureofthemagnetincreasesrentsandPMfluxasstatevariables.Theestimationmethodcanaboveacriticaltemperature,itwillresultinirreversibledemag-trackthedistributionofPMfluxcorrectlyandisrobusttomotornetizationofthemagnet.Oncethishappens,thefluxdensityparametersuncertainty.Thefluxlinkage
5、harmonicscanbede-willnotgobacktoitsoriginalvalueasthetemperaturede-rivedfromthebackEMFsbymeansofFFTanalysis.Thismethodcanbeusedtoanalysethemagnetfluxrippleanddemagnetizationcreases.ThecriticaltemperatureatwhichpointtheirreversibleinPMSM.Thesimulationandexperimentalresultsshowtheeff
6、ec-demagnetizationoccursisafunctionofthemagnetandtheloadtivenessoftheproposedrotorfluxestimationmethod.operatingcurveofthemagnet.AhighoperationtemperatureIndexTerms—EKF,fluxestimation,magnetdemagnetization,ofastatorwindingcurrentimpulsemaycausemagnetfluxPMSM.rippleordemagnetization,w
7、hichhasdirectimpactonmachineperformance[5],[6].Inamotortorquecontrolsystem,oncedemagnetizationhap-I.INTRODUCTIONpens,greatercurrentthanthemotorratedvalueflowsintothestatorwindinginordertogeneratethesameloadtorquewhenECENTLY,permanentmagnetsynchronousmotoratnormalcondition.Consequen
8、tly,thethermalleveloftheop-R(PMSM