eps用无位置传感器式无刷直流电机直接转矩控制分析-(5310)

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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