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1、wide-anglewavecontrolmethodofreducingtorquerippleforbrushlessDCmotorWUChun-hua(吳春華)，CHENGuo-cheng(陳國呈)，SUNCheng-bo(孫承波)ShanghaiKeyLaboratoryofPowerStationAutomationTechnology,ShanghaiUniversity,Shanghai200072,P.R.ChinaAbstractInordertodealwithtorquepulsationproblemcau
2、sedbytraditionalcontrolmethodforbrushlessDC(BLDG)motorandtoachievehighprecisionandgoodstability,anovelcontrolstrategyisproposed.Comparedwiththetraditionalcontrolscheme,byusingphasevoltageasacontrolobjectiveandmakingwaveformofphasecurrentapproximatelyquasi-sinusoidal,t
3、orquerippleofBLDCmotorisreducedfromtheoriginal14%to3.4%,whiletoqueisincreasedby3.8%.Furthermore,bydetectingzero-crossingsofbackelectromotiveforce(BEMF)withnon-conductingphases,sensorlesscontrolisrealized.Thenewcontrolstrategyissimple.Itcanminimizetorqueripple,increase
4、torque,andrealizesensorlesscontrolforBLDGmotor.SimulationandexperimentsshowgoodperformanceofBLDGmotorbyusingthenewcontrolmethod.Keywordswide-anglewavecontrol,BLDGmotor,torqueripple,sensorless.1IntroductionSomebrushlessDC(BLDC)motorsusedindomesticelectricalappliancessu
5、chasair-conditionerproducequasi-sinusoidalbackelectromotiveforce(BEMF)wavoforminsteadoftrapezoidalBEMFwaveformforgeneralBLDGmotors.Toreducetorquerippleforthesemotors,sinusoidalcurrentdriveisbetterthansquarecurrentdrivecontrol.However,astotraditionalsinusoidalcurrentdr
6、ivemethodsincludingthree-phasecurrenttrackcontrol,vectorcontrol,directtorquecontrolandspacevectorpulsewidthmodify(SVPWM)control,thecontrolalgorithmiscomplicatedtorealize,andpositionsensorsareaprerequisitetoacquirerotorpositionsignals.Thesesensorswillincreasecostandsiz
7、eofthemotor,increaserotationalinertiaaffectingthesystem'sdynamicandstaticcharacteristics,andreducesystemreliabilityduetoadditionalcomponentsandwirings.Insomespecialapplications,itisdifficulttomountanypositionsensoronthemotor.Takingintoaccountthesedrawbacks,BLDCmotorwi
8、thpositionsensorsarenotsuitabletobeusedinhighaccuracyandhighreliabilityapplications.Weproposeanovelsensorlesscontrolstrategy
