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1、ImprovedRotorFluxEstimationBasedonVoltageModelforSensorlessField-OrientedControlledInductionMotorDrivesGaolinWang,DianguoXu,YongYu,andWeiChenSchoolofElectricalEngineering&Automation,HarbinInstituteofTechnology,Harbin,ChinaAbstract—Speedsensorlessfield-orientedvectorcontrolofcompensationmecha
2、nismforthevoltagemodelfluxinductionmotordependsoneffectiveestimationofrotorestimation.flux.Thispaperproposesanimprovedrotorfluxestimatorbasedonstatorvoltagemodelwithprogrammablelow-passII.PROBLEMOFFLUXESTIMATIONBASEDONfilter(LPF)andanerrorcompensator.InthevoltagemodelVOLTAGEMODELbasedfluxest
3、imation,aLPFisnormallyusedtoreplacetheTherotorfluxestimatorbasedonstatorvoltagemodelpureintegratortoavoidintegrationdriftandsaturationinthestationaryreferenceframecanbeexpressedas:problems.However,theLPFestimatormayintroducemagnitudeandphaseerrors,andresultsindegradedLrȥ=--[(uiRd)tLsi].(1)es
4、timationperformanceatlowoperatingfrequency.TherL³sssssmfluxestimationerroriscompensatedaccordingtofeedbacksignaloftheestimatedfluxinthispaper.Inaddition,thewhereȥr,usandisarevectorsofrotorflux,statorLPFwithafixedcutofffrequencyisdifficulttoprovidevoltageandcurrent,respectively.Risstatorresis
5、tance.sgoodestimationforwidespeedrange.Thereasonisthat22lowercutofffrequencyrequiredforwidespeedoperationLsisstatorinductance.s=-()LLsrmmLLisleakagemayresultinweakeningtherestraintofdcdriftproblem.fluxcoefficient.LandLare,respectively,themrToachievethecompromise,animprovedprogrammablemagneti
6、zingandrotorinductances.LPFrotorfluxestimatorwithacompensatorfordcdriftrestraintisintroduced.ThevalidityoftheproposedrotorUsually,aLPFisadoptedtoreplacetheopenintegrator:fluxestimatorisverifiedbyspeedsensorlessfield-orientedL1rvectorcontrolled11kWinductionmotor.Experimentalȥ=-()eisL(2)rsssLs
7、+wresultsdemonstratehighperformanceoftheimprovedrotormcfluxestimator.whereeisEMFofthestatorwingding.wiscutoffscfrequencyoftheLPF.I.INTRODUCTIONFrom(2),theamplitudeandphaseerror,DandField-orientedvectorcontrolledinductionmotordrivesmagwithoutspeedse
