Incremental motion control of an induction motor

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1、Incrementalmotioncontrolofaninductionmotorservodriveviaagenetic-algorithm-basedslidingmodecontrollerW.-D.Chou,F.-J.LinandK.-K.ShyuAbstract:Anincrementalmotioncontrolproblem,specifiedbyatrapezoidalspeedcommandprofileusingmulti-segmentslidingmodecontrol(MSSMC),isproposedtocontrolaninductionmo

2、tor(IM)servodrive.SincethecontrolgainsintheMSSMCarefixed,chatteringresponsesoccurduetolargeexternalloaddisturbances.Therefore,areal-timegeneticalgorithm(GA)isdevelopedtotunethecontrolgainsonline.Afield-orientedcontrolIMservodriveisimplementedand,eachsegmentofthemulti-segmentswitchingsurface

3、isdesignedsoastomatchthecorrespondingpartofthetrapezoidalspeedcommandprofile.Asaconsequence,themotordynamicsonthespecifiedsegmentswitchingsurfacehavethedesiredspeedoraccelerationcorrespondingtothetrapezoidalspeedcommandprofile.TheoreticalanalysesfortheproposedGA-basedMSSMCaredescribedindetai

4、l.TheeffectivenessoftheproposedIMservodriveisdemonstratedusingsimulatedandexperimentalresults.1Introductioncommandprofileisdesignedbeforehand.OneofthemostcommonlyusedspeedcommandprofilesisthetrapezoidalVariablestructurecontrol(VSC)(alsoknownasslidingspeedcommandprofile.Itincludesthreeparts:(

5、i)constantmodecontrol(SMC))isknowntobeaveryeffectiveway,acceleration;(ii)constantspeed;and(iii)constantdecele-forthecommandtrackingcontrolofclosed-loopcontrolration.However,constantaccelerationandspeedcannotbesystemsduetoitsmanyadvantages,includinginsensitivitydesignedusingconventionalVSC

6、methods.Accordingly,atoparametervariationsandexternaldisturbancerejection,multi-segmentslidingmodecontrol(MSSMC)techniqueandfastdynamicresponses.Consequently,VSChasbeenisnowproposedthatisinaccordancewiththetrapezoidalwidelyusedinDCandACmotordrives[1–5].ThesystemspeedcommandprofileforanIMse

7、rvodrive.WealsodynamicsofaVSCsystemcanbedividedintotwophases:showthatthereachingphaseoftheconventionalVSCdoes(i)thereachingphase;and(ii)theslidingphase.ThenotexistintheMSSMC,becausethesystemdynamicsarerobustnessofaVSCsystemresidesinitsslidingphase,inaslidingmodeatth