2019电力电子变频传动技术第9章ppt课件.ppt

2019电力电子变频传动技术第9章ppt课件.ppt

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时间:2020-09-17

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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

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