直流调速系统设计与仿真外文翻译

DoubleLoopDCSpeedControlSystemDescription工学部专业自动化班级学号姓名指导教师负责教师沈阳航空航天大学北方科技学院2010年6月沈阳航空航天大学北方科技学院毕业设计（外文翻译）1DoubleLoopDCSpeedControlSystemDescriptionⅠ.systemanalysisandsynthesis1．Analysis（1）Inthespeedandcurrentdualclosed-loopspeedcontrolsystem,inordertochangethemotorspeed,whatparametersshouldberegulating?ChangespeedregulatorKnmagnificationwork?PowerelectronicconvertertochangethemagnificationfactorKswork?Changethespeedofthefeedbackcoefficientofwork?Tochangethemotor'sstallcurrentsystemshouldadjusttheparametersofwhat?A:Tochangethemotorspeed,changespeedregulatorKnmagnificationandpowerelectronicconverterswillnotworkmagnificationfactorKs,stablewhenn=Un=Un*,sotheonlychangeinthevalueofagivencoefficientofUn*andfeedbackbefore.Tochangethemotor'sstallcurrent,onlyneedtochangethesamevaluegivenUim*andfeedbackcoefficient,becausethestability,Uim*=Idm,canbedrawnfromthetype(2)Speed,thecurrentdoubleclosed-loopspeedcontrolsystemwhenthesteady-stateoperation,thetworegulatorinputvoltageandoutputvoltagedeviationisthenumber?A:Thespeedandcurrentdualclosed-loopspeedcontrolsystemwhenthesteady-stateoperation,thetworegulatorsaretheinputbiasvoltageiszero,bytheformulan=Un=Un*,n=n;Uim*=Idm,Idm=Idl.(3)Inthespeedandcurrentdualclosed-loopspeedcontrolsystem,thetworegulatorsarePIregulator.Whenthesystemisrunningwithratedload,thespeedfeedbacklinesuddenlydisconnected,thesystemre-enterthesteady-state,thecurrentregulatoristheinputbiasvoltagetozero?Why?A:Whenthesystemisrunningwithratedload,thespeedfeedbacklinesuddenlydisconnected,thenUn=0,=Un*-Un=Un*,sothatUitoreachUim,0,rateofincreaseinn,whenthesystemafterre-enteringthesteady-state,thatis,Id=Idl,then,=Uim*-Idl0,arenolongerchanges,changesinrotationalspeednisnolonger,butatthistimethantherotationalspeednatthetimeofthefeedbacklinespeedtobreakbig.(4)Whyisthespeedwithintegralcontrolsystemisnotstaticpoor?A:Speedregulatorintegralsystem,toachievenon-staticerrorisduetothecharacteristicsofintegralcontrolregulator,thatis,theaccumulationofpointsandtheroleofmemory.沈阳航空航天大学北方科技学院毕业设计（外文翻译）2(5)Double-loopspeedcontrolsystem(PI),loadchanges,IdlIdm,askedbicyclolspeedcontrolsystemASRandACRhow-conditioning,theresult?A:Whentheloadchanges,IdlIdm,speeddecreasedrapidly,thecurrentIdsoontoIdm,andoflimitedamplitude,rapidrateofASRsaturation,ACRhasbeenlimitingconditions,toformablockingphenomenon,long-runningwilldamagethesystem.2.SystemSpeedregulatorandcurrentregulatorintheDoubleLoopDCMotorControlSystemcanbesummarizedasfollows:(1).TheroleofspeedregulatorSpeedregulatorisaspeedcontrolsystemofthedominantregulator,whichallowsspeednwillsoonchangewithagivenvoltageUn*changesinsteady-statespeederrorcanbereduced,ifthePIregulatorcanachievethenon-staticerror.1)Theeffectofloadchangesintheroleofanti-disturbance.2)Theoutputamplitudeofthedecisionlimitthemaximumallowablemotorcurrent.(2)Theroleofcurrentregulator1)Asaregulatoroftheinnerring,outerringatthespeedoftheadjustmentprocess,itmakesthecurrentcloselyfollowedthegivenvoltageUi*(thatis,theouterringmodulatoroutput)changes.2)Fluctuationsinvoltagefromtheroleofdisturbancerejectionintime.3)Thespeedofthedynamicprocessofensuringthatthemaximumallowablemotorcurrent,therebyspeedingupthedynamicprocess.4)Whenthemotoroverloadorstallwhenthearmaturecurrentlimitofthemaximum,automaticprotectionfromtheroleofacceleration.Oncethefaultdisappears,thesystemautomaticallyreturntonormal.Yesterday,theroleofthereliableoperationisveryimportant.Ⅱdouble-loopspeedcontrolsystemcommonfaultsanalysis1.Introductionofasystem(1).Double-loopspeedcontrolsystemcomponentsinFigure1.1Currentloop:fromthecurrentregulatorLT,triggerCF(inputtransformationfortheCSR),silicon-controlledrectifierbridge,motorarmatureandcurrentlooptransformLBcomponent.thespeedofouterring:thespeedregulatorfromST,currentloop,suchaslinkinertia,motorandloadmomentofinertiaandthespeedoftransformation沈阳航空航天大学北方科技学院毕业设计（外文翻译）3componentsSB.inthedouble-loopspeedcontrolsystem,thespeedofthedecisionloopoftherunningcharacteristicsofthewholesystemandstability,andplayaleadingrole,andtochangethecurrentringplaystheroleoftheinternalstructureofthesystemisdependent,butsinceitisasawholetoparticipateintheclosed-loopspeedtothespeedofadirectimpactontheworkoftheclosed-loop,itmustfirstgooddebuggingcurrentloop,andthentestingthespeedofouterring,sothatthewholesystemhasgooddynamicperformance.(2).Double-loopspeedcontrolsystemofthetypicalworkingcondition1)Start(orthespeed):STinthestart-upprocesshasbeensaturated,sothatthespeedofthisloopintheequivalentopen-loopstate.Systemonlyintheconstantcurrentloopundertheregulationtoensurethemotorataconstantcurrentofthemaximumallowableunderthestart-up.Figure1double-loopspeedcontrolsystemstructure2)slowdown(orstop):STatthistimetoreachtheoutputamplitudeofthereverselimit.Maincircuitcurrentbythebridgeisreducedtozeroaftertheinverter.LTandCSRoutputwillsoonreachthemaximumreverse.CFpulseoutputtoreachβmin,currentloopforopen-loop.motortorqueunderdecelerationuntilthemotorspeedclosetothegivennewvalue,currentloopandspeedlooponeafteranotherintotheclosed-loopwork,motorinthenew