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1、IEEETRANSACTIONSONINDUSTRIALELECTRONICS,VOL.35,NO.1,FEBRUARY198885ObserversforFluxEstimationinInductionMachinesGEORGEc.VERGHESE,MEMBER,IEEE,ANDSETHR.SANDERSAbstract-Fluxestimationininductionmachinesisexaminedfromthefasterconvergencerate,suchasreducedsensitivitytopararne-vie
2、wpointofobservertheory.Itispointedoutthatestimatorspresentlytervariations,isalsomentionedinthesesections.SectionVI1usedinconnectionwithschemessuchasfield-orientedcontrolarediscussesissuesrelatedtosampled-dataimplementationoftypicallyreal-timesimulationsofmachineequations,wi
3、thoutfeedbackofobservers.Apreliminaryreportontheworkpresentedinthisanycorrectivepredictionerror.Weshowthatcorrectivefeedbackcanbeusedtospeedupconvergenceofthefluxestimates,andnotethatitcanpaperappearedintheconferencepaper[4],whileseveralalsoreducethesensitivityoftheestimate
4、stoparametervariations.detailsnotshowninthepresentpaperaregiveninthethesis[51.SomepioneeringworkalongthedirectionspursuedinthisI.INTRODUCTIONpapercanbefoundinpapersofBellinietal.[6]-[8]and,moreFIELD-ORIENTEDcontrolhas(alongwithsomevariants)recently,[9].Ourresults,whilesimil
5、arinseveralrespectsemergedasanimportantapproachtothecontrolofac(eventhoughinitiallydevelopedcompletelyindependently),machines,andcontinuestobediscussedanddevelopedintheareperhapsmoretransparent.Onereasonforthisisthatourliterature(see[I]-[3],[27],[28],andreferencestherein).d
6、evelopmentviewsanobserverasareal-timesimulationRotorfluxestimationfromtheterminalvariables(statorcorrectedbyfeedbackofapredictionerrorterm,andtherebyvoltageandcurrent,androtorspeed)isakeystepinthemostpermitstheobserverapproachtobedirectlyrelatedtoexistingpopularimplementati
7、onsofsuchfield-orientedcontrolforfluxestimationschemes.Thereisalsosignificantoverlapinductionmachines.Theestimationschemesinuseforthisbetweenourworkandtheinterestingandthoroughstudyinthepurposearetypicallyreal-timesimulationsofthedynamicrecentthesis(inGerman)ofZagelein[lo].
8、Someoftheseequationsgoverningrotorflux.Thetaskofrotorfluxconnectionsto[6]-[IO]aren
