直流无刷电机外文资料原文及译文.docx

直流无刷电机外文资料原文及译文.docx

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直流无刷电机外文资料原文及译文

外文资料原文

CommutationTorqueRippleReductioninBLDCMotorUsingPWM_ON_PWMMode

GuangweiMeng,HaoXiong,HuaishuLiDepartmentofElectricalEngineering,NavalUniversityofEngineering,Wuhan,China.

Abstract--ThepaperanalyzesthesteadycommutationprocessoftheBLDCmotorusingPWMmode,confirmsthecommutationtimetokeepnoncommutationphasecurrentamplitudeconstantduringcommutationperiodbywayofPWMintheperiodtoimplementthecompensationcontroltoeliminatecommutationtorquerippleunderbothlowspeedandhighspeedoperation,investigatestheeffectbyPWMmodeonathree-phasesix-state120°turn-onBLDCmotor,andpresentstorqueripplecompensationcontrolinPWM_ON_PWMmode,whichcannotonlyentirelyeliminatetorquerippleresultedfromthecurrentemergingintheturn-offphaseduringnon-commutationperiodbutalsocompensatetorqueripplecausedbythecommutationcurrentduringcommutationperiod.

IndexTerms—BLDCmotor,commutation,PWM,torqueripple.

I.INTRODUCTION

TheBLDCmotorshavebeenwidelyusedduetoitsfeatures－asimplestructure,goodspeedadjustingperformance,highpowerdensity,lownoiseandsimplecontrol,etc.ItisahotspottosuppressthetorquerippleandimprovethecontrolperformanceofaBLDCmotorwiththetrapezoidalbackemf.

BLDCmotorsusuallyoperateinallkindsofPWMmodes,whichnotonlyaffectthedynamiclossofpowerswitchesandradiationuniformity,butalsoinfluencethetorqueripple.Itisaneffectivewaytosuppressthetorqueripplethroughchangingdcbuschoppercontroltoremainnon-commutationphasecurrentamplitudeconstant,butitresultsintoamorecomplextopology[1]-[3].Itisjustfitforlowspeedapplicationstocontrolnon-commutationphasecurrentamplitudetoregulatethecommutationtorqueripple[4].ItisanalyzedabouttheinfluenceresultedfromPWMONmodeonthetorqueripplein[5].Theideasin[1]-[3]aretoadoptdifferentsuppressionmethodsindifferentspeedinterval,buttheydon’ttaketheeffectbyPWMmodesonthesysteminaccount.Thepredictivecurrent,neuralnetworkcontrolandactivedisturbancerejectioncontroletcareintroducedtosuppressthetorqueripplein[9]-[12],butthecontrolalgorithmismorecomplicatedandharderforrealization.

DependingonthecommutationprocessofBLDCmotorsandtheeffectbyPWMmodesonthesystem,thepaperpresentsatorqueripplecom-pensationcontrolinPWM_ON_PWMmodeatdifferentspeedsbyseekingdifferentPWMmodulationratiosduringcommutationperiodasmotorrunsatlowspeedandhighspeed.Themethodretainstheoriginalto-pology,improvesthecontrolperformanceofthesystemdramatically,

andmoreoveriseasytorealize.

II.ELECTROMAGNETICTORQUEOFBLDCMOTOR

DURINGCOMMUTATIONPROCESS

AssumethattheBLDCmotoristhree-phasesymmetricalandY-connected,andneglecteddycurrentsandhysteresislosses,itsequivalentcircuitandmaincircuitareshowninFigure1.r,Laretheresistanceandinductanceofthestatorwindingsrespectively;arethecounteremfsofthecorrespondingphasewindingsrespectively;arethecorrespondingphasecurrentsrespectively.

（1）

Thecounteremfofeveryphasewindingisatrapezoidalwaveformwithaflat-topwidthgreaterthanorequalto1200electricaldegree,

anditsflat-topamplitudeisEm.Whenthemotorworksinthree-phasesix-state1200turn-onmode,thecurrentsdon’tcommutatesinstantaneouslyasaresultoftheinductanceofthearmaturewinding.Takethepowerswitchand’sturn-ontoand’sturn-onforexample.Duringthecommutation,itisgainedasfollows

（2）

SupposethatthemechanicalangularvelocityoftherotorisΩ,thetoquecanbeobtainedasfollowsduringthecommutationprocess.

（3）

Itisobviousfrom（3）thatthetoqueisproportionaltothenon-commutationphasecurrentduringcommutation,i.e.thecommutationtorqueripplecanbeeliminatedsolongasnon-commutationphasecurrentremainsconstantduringcommutation.

III.COMMUTATIONPROCESSWITHOUTCONSIDERING

EFFECTBYPWMANDARMATUREWINDINGRESISTANT

AssumethatthecircuitstatuschangesfromphaseAandC’sturn-ontophaseBandC’sturn-on,phaseAcurrentflowsanddecaystozerogradually,whilephaseBcurrentincreasestothemaximumgraduallyandreachesitssteady-statevalue.ThecircuitequationduringcommutationwithoutconsideringtheeffectbyPWMcanbewrittenasfollows.

（4）

ComparedwiththewindingtimeconstantofaBLDCmotor,PWMperiodcanbethoughtsmallenough,andthen.

Sotheeffectofthearmaturewindingresistantcanbeneglected.Moreovertheinitialandfinalvaluesofeveryphasecurrentequaleveryphasesteady-statecurrentvaluebeforeandafterthecommutation.Allphasecurrentsduringthecommutationcanbeobtainedfrom

（1）,

（2）and（4）.

（5）

Thenthetoqueduringthecommutation