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1、咸宁学院本科毕业论文（设计）：外文翻译电子与信息工程学院本科毕业论文(设计)外文文献翻译译文题目：Oscillation,InstabilityandControlofStepperMotors学生姓名：专业：指导教师：2010年2月咸宁学院本科毕业论文（设计）：外文翻译Oscillation,InstabilityandControlofStepperMotorsLIYUCAOandHOWARDM.SCHWARTZDepartmentofSystemsandComputerEngineering,CarletonUniversity,1125Colo
2、nelByDrive,Ottawa,ONK1S5B6,Canada(Received:18February1998;accepted:1December1998)Abstract:Anovelapproachtoanalyzinginstabilityinpermanent-magnetsteppermotorsispresented.Itisshownthattherearetwokindsofunstablephenomenainthiskindofmotor:mid-frequencyoscillationandhigh-frequencyins
3、tability.Nonlinearbifurcationtheoryisusedtoillustratetherelationshipbetweenlocalinstabilityandmid-frequencyoscillatorymotion.Anovelanalysisispresentedtoanalyzethelossofsynchronismphenomenon,whichisidentifiedashigh-frequencyinstability.Theconceptsofseparatricesandattractorsinphas
4、e-spaceareusedtoderiveaquantitytoevaluatethehigh-frequencyinstability.Byusingthisquantityonecaneasilyestimatethestabilityforhighsupplyfrequencies.Furthermore,astabilizationmethodispresented.Ageneralizedapproachtoanalyzethestabilizationproblembasedonfeedbacktheoryisgiven.Itisshow
5、nthatthemid-frequencystabilityandthehigh-frequencystabilitycanbeimprovedbystatefeedback.Keywords:Steppermotors;instability;nonlinearity;statefeedback1.IntroductionSteppermotorsareelectromagneticincremental-motiondeviceswhichconvertdigitalpulseinputstoanalogangleoutputs.Theirinhe
6、rentsteppingabilityallowsforaccuratepositioncontrolwithoutfeedback.Thatis,theycantrackanysteppositioninopen-loopmode,consequentlynofeedbackisneededtoimplementpositioncontrol.SteppermotorsdeliverhigherpeaktorqueperunitweightthanDCmotors;inaddition,theyarebrushlessmachinesandthere
7、forerequirelessmaintenance.Allofthesepropertieshavemadesteppermotorsaveryattractiveselectioninmanypositionandspeedcontrolsystems,suchasincomputerharddiskdriversandprinters,XY-tables,robotmanipulators,etc.咸宁学院本科毕业论文（设计）：外文翻译Althoughsteppermotorshavemanysalientproperties,theysuffe
8、rfromanoscillationorunstablephenomenon.Thisphen
