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1、沈阳航空航天大学北方科技学院毕业设计（外文翻译）DoubleLoopDCSpeedControlSystemDescriptionⅠ.systemanalysisandsynthesis1．Analysis（1）Inthespeedandcurrentdualclosed-loopspeedcontrolsystem,inordertochangethemotorspeed,whatparametersshouldberegulating?ChangespeedregulatorKnmagnificationwork?Powerelectronicconve
2、rtertochangethemagnificationfactorKswork?Changethespeedofthefeedbackcoefficientofwork?Tochangethemotor'sstallcurrentsystemshouldadjusttheparametersofwhat?A:Tochangethemotorspeed,changespeedregulatorKnmagnificationandpowerelectronicconverterswillnotworkmagnificationfactorKs,stablewh
3、enn=Un=Un*,sotheonlychangeinthevalueofagivencoefficientofUn*andfeedbackbefore.Tochangethemotor'sstallcurrent,onlyneedtochangethesamevaluegivenUim*andfeedbackcoefficient,becausethestability,Uim*=Idm,canbedrawnfromthetype(2)Speed,thecurrentdoubleclosed-loopspeedcontrolsystemwhenthest
4、eady-stateoperation,thetworegulatorinputvoltageandoutputvoltagedeviationisthenumber?A:Thespeedandcurrentdualclosed-loopspeedcontrolsystemwhenthesteady-stateoperation,thetworegulatorsaretheinputbiasvoltageiszero,bytheformulan=Un=Un*,n=n;Uim*=Idm,Idm=Idl.(3)Inthespeedandcurrentdualcl
5、osed-loopspeedcontrolsystem,thetworegulatorsarePIregulator.Whenthesystemisrunningwithratedload,thespeedfeedbacklinesuddenlydisconnected,thesystemre-enterthesteady-state,thecurrentregulatoristheinputbiasvoltagetozero?Why?A:Whenthesystemisrunningwithratedload,thespeedfeedbacklinesudd
6、enlydisconnected,thenUn=0,=Un*-Un=Un*,sothatUitoreachUim,0,rateofincreaseinn,whenthesystemafterre-enteringthesteady-state,thatis,Id=Idl,then,=Uim*-Idl0,arenolongerchanges,changesinrotationalspeednisnolonger,butatthistimethantherotationalspeednatthetimeofthefeedbacklinespeedtobreakb
7、ig.(4)Whyisthespeedwithintegralcontrolsystemisnotstaticpoor?A:Speedregulatorintegralsystem,toachievenon-staticerrorisduetothecharacteristicsofintegralcontrolregulator,thatis,theaccumulationofpointsandtheroleofmemory.(5)Double-loopspeedcontrolsystem(PI),loadchanges,Idl>Idm,askedbicy
8、clol14沈阳航空航天大学北方科技学院毕业设计（外
