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40120101()JOURNALOFSOUTHEASTUNIVERSITY(NaturalScienceEdition)Vol.40No.1Jan.2010doi:10.3969/j.issn.1001-0505.2010.01.017(,210096)(,210096):PWM,.PWM,.,.,,,,..:;;;;:TM351:A:1001-0505(2010)0120089206Newaccuratecommutationmethodbasedondirectback2EMFmethodforbrushlessDCmotorLinMingyaoZhouGuqingLiuWenyong(EngineeringResearchCenterforMotionControlofMinistryofEducation,SoutheastUniversity,Nanjing210096,China)(SchoolofElectricalEngineering,SoutheastUniversity,Nanjing210096,China)Abstract:Thesensorlesscontroldriveforbrushlessdirectcurrentmachine(BLDCM)isinvestigatedbasedondirectbackelectromotiveforce(back2EMF)detectionmethod.Theterminalvoltagewave2formisanalyzedfortheH_pwm2L_ontypeofmodulation,andthezero2crossingpointdetectionmeth2odsarediscussed.Theterminalvoltageissampledattheendofpulsewidthmodulation(PWM)on2stateandthezero2crossingpointisextractedfromtheproposedalgorithm.Theeffectsoftheleadingandthelaggingcommutationontheoperationperformanceareanalyzed,andtheconditionoftheopti2malcommutationispresented.Becausethezero2crossingpointsdistributeasymmetricallyintheBLD2CM,anewsettingmethodofdelaytimeissuggestedandthemoreaccuratecommutationsarea2chieved.Theexperimentresultshaveverifiedthefeasibilityandvalidityoftheproposedmethod.Keywords:backelectromotiveforcemethod;terminalvoltage;zerocrossingpointdetection;com2mutation;brushlessdirectcurrentmachine:2009205227.:(1959),,,,mylin@seu.edu.cn.:((BK2008306).:,,.[J].:,2010,40(1):89294.[doi:10.3969/j.issn.1001-0505.2010.01.017](BLDCM),.,,[122],.[3],PWM,2,,.[4],.,,.[5]on_pwm,ADPWM,,.,,.1,,,.,30,.,.,.,.1(a),UA,UB,UCUDCUa,Ub,UcUdc.(a)(b)1,,1(b),eA,eB,eC.6,60,120.2,1(b),BAB,A;Q3Q4BA2.,,Z,C.,30.2PWM[1].,.PWM,(H_pwm2L_on).A,PWM50%,,2(a).,ABA,BC,AC,AB,CBCA,.BCCB,A.(a)A(b)A2PWMBACAA,Q4,A,.,.ACABAPWM.AC,PWM,Q1Q2,A,09()40UDC;PWM,Q1,Q2,,AD4,A,.BCCBA,2,2(b).BC,B,C,3.,RSLS,UN,i.,UN=UB-iRS+LSdidt-eB(1)UN=UC-iRS+LSdidt-eC(2)(1)(2)UN=UB+UC2-eB+eC2(3)B,C:eB+eC=0(4)3ABCPWM,Q3Q2,UB=UDC,UC=0,UN=UDC/2,[6]UA=eA+UDC/2(5)eAUDC/2,2(b).PWM,Q3,Q2D6,UB=UC=0,UN=0,UA=eA(6)1),AeA,UN,D4[7],4(a),A,.2),AeA,D4,eA,2(b).(a)(b)4PWMPWM.,,PWM,.(5),A,A,UAUDC/2eA0.,.,,,,.,.3[8],,120,5.,FaFr.90,.,,,,,tZC,6.,30,,191,:(a)(b)5,.,,,,,tZC.,.(1)7,2,.630,,tZC.,,30.,,[9210],8.,Z(k),C(k)kk,k,:tZC(k)=TZZ(k-1)2(7),TZZ(k-1)k-1k;tZC(k)kk.,(a)(b)728.,,.,,,.,.42,.,,,,.29()40A,,.9,,,TZZ(1),TZZ(2)TZZ(3).2180,,TZZ(1)=TZZ(4),TZZ(2)=TZZ(5)TZZ(3)=TZZ(6).9A,.,,,10.1022,.11,TZZ(k-3)TZZ(k),k,kktZC(k):tZC(k)=TZZ(k-3)2(8),TZZ(k-3)k-3k-2.11120,,,2,,,10.,,.2(1)12,23,2,3.(a)(b)12213(13),4.391,:1351),.,,.2),,,.3),,.4),kkk-3k-2,,2,..(References)[1],,,.[J].,2002,6(3):2082212.SongHailong,YangMing,FanYu,etal.ReviewofsensorlesscontrolofbrushlessDCmotor[J].ElectricMachinesandControl,2002,6(3):2082212.(inChi2nese).[2],,.[J].,2007,34(7):125.ZhouYanqing,YinHuajie,YeChangqing.PositiondetectionforpositionsensorlessbrushlessDCmotor[J].ElectricMachines&ControlApplication,2007,34(7):125.(inChinese)[3]ShaoJianwen.Animprovedmicrocontroller2basedsen2sorlessbrushlessDC(BLDC)motordriverforautomo2tiveapplications[J].IEEETransactionsonIndustryApplications,2006,42(5):121621221.[4],,,.[J].,2006,21(10):26230.ZhangLei,QuWenlong,LuHaifeng,etal.AnovelsensorlesscontrolsystemofbrushlessDCmotors[J].TransactionsofChinaElectrotechnicalSociety,2006,21(10):26230.(inChinese)[5]KangYongjin,LeeSangBin,YooJiyoon.Amicro2controllerembeddedADconverterbasedlowcostsen2sorlesstechniqueforbrushlessDCmotordrives[C]//IEEEIndustryApplicationsConference.HongKong,China,2005:217622181.[6]LaiYen2Shin,LinYong2Kai.Novelback2EMFdetec2tiontechniqueofbrushlessDCmotordrivesforwiderangecontrolwithoutusingcurrentandpositionsensors[J].IEEETransactionsonPowerElectronics,2008,23(2):9342940.[7],,.PWM[J].,2005,25(7):1042108.WeiKun,HuChangshen,ZhangZhongchao.AnovelPWMschemetoeliminatethediodefreewheelingoftheinactivephaseinBLDCmotor[J].ProceedingsoftheCSEE,2005,25(7):1042108.(inChinese)[8],,,.[J].,2003,30(5):14216.LinMingyao,WangYong,LiHaiwen,etal.AnalysisofbestcommutationlogicincontrolofbrushlessDCmotorbasedonback2EMFmethod[J].ElectricMa2chines&ControlApplication,2003,30(5):14216.(inChinese)[9]KimDae2Kyong,LeeKwang2Woon,KwonByung2il.Commutationtorqueripplereductioninapositionsen2sorlessbrushlessDCmotordrive[J].IEEETransac2tionsonPowerElectronics,2006,21(6):176221768.[10]ZhouGenfu,WuZhigan,YingJianping.ImprovedsensorlessbrushlessDCmotordrive[C]//PowerE2lectronicsSpecialistsConference.Recife,Brazil,2005:135321357.49()40