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1、Chapter9KouheiOhnishi,NobuyukiMatsui,YoichiHoriEstimation,Identification,andSensorlessControlinACDrives1ACdrivesbecamemoreandmoreeconomicalandpopular.Sincetheearlyyearsofthe20thcentury,electricmotorsforvariablespeeddriveshavebeenwidelyappliedinlarge-capacityapplications
2、thesteelindustrytheautomobileindustryIntheearlystage,DCmotorswerewidelyusedforadjustablespeedcontrolSincethelate1960s,ACmotorshavebeenreplacingDCmotorsinawideareaofindustryapplicationsSinceACdrivesrequiredmorecomplicatedcontrollersinthebeginning,theywerenotsoeconomicall
3、yfeasibleAlliedtoadvancesbothindigitalcontroltechnologyandpowersemiconductordevices,ACdrivesbecamemoreandmoreeconomicalandpopular.Inalmostallareas,DCdrivesarenowreplaceablewithACdrives2However,therestillexistsomeareaswhicharenotsuitableforACdriveapplications.Oneofthesei
4、stheareawhichrequiresprecisetorquecontrol.Forinstance,injectionmachines.ACmotorssometimesgeneratetorqueerrorortorquepulsationduetosomeparametervariations.Toovercomesuchproblems,moresophisticatedtechniquesarenecessaryinthecontroller.Thesetechniquesarebasedonestimationori
5、dentificationofmotorparametersEmploytherecentdevelopmentsindigitalcontrol,includinghigh-speeddigitalsignalprocessors(DSPs)andparallelprocessingToovercometorqueproblems….…39.2PARAMETERESTIMATIONINACDRIVES9.2.1.ParameterIdentificationInBrushlessMotors9.2.2.ParameterIdenti
6、ficationInInductionMotors4Thecontrolschemeofbrushlessmotorswithtrapezoidalfluxdistributions(BLDM,brushlessDCmotor)isrelativelysimple.Usuallyitdoesnotneedparameteridentification.Forbrushlessmotorswithsinusoidalfluxdistribution(PMSM,permanentmagnetsynchronousmotor),genera
7、llyidentificationoftheparametersisnecessaryforprecisecontrol.(3electricparameters)Armatureresistance,armatureinductance,andEMFcoefficient.ParametersofBrushlessMotors5Twoeffectiveapproachesarepresentedhere:self-tuningregulator(STR)whichhasatuningabilitytomakeoutput-error
8、zeroinsidethecontroller;modelreferenceadaptivesystem(MRAS)whichhasareferredmodelinthecontroller.Directapplicat
