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1、Chapter9KouheiOhnishi,NobuyukiMatsui,YoichiHoriEstimation,Identification,andSensorlessControlinACDrives1ACdrivesbecamemoreandmoreeconomicalandpopular.Sincetheearlyyearsofthe20thcentury,electricmotorsforvariablespeeddriveshavebeenwidelyappliedinlarge-capacityapplicationsthesteelindustrytheautomo
2、bileindustryIntheearlystage,DCmotorswerewidelyusedforadjustablespeedcontrolSincethelate1960s,ACmotorshavebeenreplacingDCmotorsinawideareaofindustryapplicationsSinceACdrivesrequiredmorecomplicatedcontrollersinthebeginning,theywerenotsoeconomicallyfeasibleAlliedtoadvancesbothindigitalcontroltechn
3、ologyandpowersemiconductordevices,ACdrivesbecamemoreandmoreeconomicalandpopular.Inalmostallareas,DCdrivesarenowreplaceablewithACdrives2However,therestillexistsomeareaswhicharenotsuitableforACdriveapplications.Oneoftheseistheareawhichrequiresprecisetorquecontrol.Forinstance,injectionmachines.ACm
4、otorssometimesgeneratetorqueerrorortorquepulsationduetosomeparametervariations.Toovercomesuchproblems,moresophisticatedtechniquesarenecessaryinthecontroller.ThesetechniquesarebasedonestimationoridentificationofmotorparametersEmploytherecentdevelopmentsindigitalcontrol,includinghigh-speeddigital
5、signalprocessors(DSPs)andparallelprocessingToovercometorqueproblems….…39.2PARAMETERESTIMATIONINACDRIVES9.2.1.ParameterIdentificationInBrushlessMotors9.2.2.ParameterIdentificationInInductionMotors4Thecontrolschemeofbrushlessmotorswithtrapezoidalfluxdistributions(BLDM,brushlessDCmotor)isrelativel
6、ysimple.Usuallyitdoesnotneedparameteridentification.Forbrushlessmotorswithsinusoidalfluxdistribution(PMSM,permanentmagnetsynchronousmotor),generallyidentificationoftheparametersisnecessaryforprecisecontrol.(3electricparameters)Armatureresistance,armatureinductance,andEMFcoefficient.Parametersof
7、BrushlessMotors5Twoeffectiveapproachesarepresentedhere:self-tuningregulator(STR)whichhasatuningabilitytomakeoutput-errorzeroinsidethecontroller;modelreferenceadaptivesystem(MRAS)whichhasareferredmodelinthecontroller.Directapplicat
