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ID:33731296
大小:15.23 MB
页数:63页
时间:2019-02-28
《eps用无位置传感器式无刷直流电机直接转矩控制分析-(5310)》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、江苏大学工程硕士字位论文ABSTRACTAsoneofthemostimportantpartsinacar,steeringsystemmakesadefinitiveeffectwhendriving.Nowadays,ElectricPowerSteeringSystemisgraduallyinsteadofHPS,andtobealeadinthefieldofpowersteering.EPShasalotofmerits,suchascompact,portable,easyassembly,highefficiencyandenvkonment
2、protective,especially,byusingelectromotortoprovideassistantpower,thetorqueofthemotorwillvarywiththevehidespeed.TheelectromotorplaysavitalroleinEPS,alongwiththedevelopmentofmodemelectronictechnology,BLDCM(brushlessdirectcurrentmotor)iswidelyusedinEPS,foritssmallvolume,highpowerdestin
3、y,extendedspeedrange,greattorqueinlowspeed,etc.WhenBLDCMworksinEPS,fluctuationoftorqueshouldbedecreased,andthemotormustfilltherequirementsofmutativeassisttorque.Inthispaper,thetopicmainlyfocusonresearchoftheDTCcontrolstrategyusinginEPSwithBLDCM.Thepapersolvetwoaspects,oneisthattheBL
4、DCMcanworksmoothly,theotheristhattheworkingstatusofBLDCMmustmatchwiththewholeEPSsystem.ThepaperintroducesthethreedifferentcontrolstrategiesoftheEPSwithBLDCMareresearched.Itisrespectivelythecontrolofassistantpowerwhendriving,thereturningbackofsteeringwheelinmid-lowspeed,thedampingcon
5、trolofsteeringwheelinhighspeedwhenoverreturnback.Itresearchesseveralmethodstodetectthepositionoftherotor,whiletheBLDCMissensorless.ItanalysestheEMFzero—crossingmethod,andcomparedwiththecommonmethodtodetecteachphase,anewwayisusedinthispaper,SOthatthedetectionaccuracywillbeimproved.Al
6、so,thedirecttorquecontrolisusedinEPS,anddesignsprocedureofdirecttorquecontroller.DependondynamicsrelationofEPS,modelsincludedtwodegreesoffreedomcar,eachpartoftheEPSsystem,arecreatedbyusingMatlab/simulink,anddesignsthedirecttorquecontrolmodule.Toinputasineandstepwavetothemodeltosimul
7、ate.ThesimulationanalysestheresponseoftheBLDCM,thefluctuationofIIIEPS用无位置传感器式无刷直流电机直接转矩控制研究torqueresponse,EPSworkssmoothlyandthesteeringwheelcailreturnbackaccuratelyinhighspeeddriving.Inaword,thehandlingstabilityofthecarisimproved.Finally,comparedthecontrollerforsimulationwithbencht
8、estindifferentworkc
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