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1、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）DoubleLoopDCSpeedControlSystemDescriptionⅠ.systemanalysisandsynthesis1．Analysis（1）Inthespeedandcurrentdualclosed-loopspeedcontrolsystem,inordertochang
2、ethemotorspeed,whatparametersshouldberegulating?ChangespeedregulatorKnmagnificationwork?PowerelectronicconvertertochangethemagnificationfactorKswork?Changethespeedofthefeedbackcoefficientofwork?Tochangethemotor'sstallcurrentsystemshouldadjusttheparametersofw
3、hat?A:Tochangethemotorspeed,changespeedregulatorKnmagnificationandpowerelectronicconverterswillnotworkmagnificationfactorKs,stablewhenn=Un=Un*,sotheonlychangeinthevalueofagivencoefficientofUn*andfeedbackbefore.Tochangethemotor'sstallcurrent,onlyneedtochanget
4、hesamevaluegivenUim*andfeedbackcoefficient,becausethestability,Uim*=Idm,canbedrawnfromthetype(2)Speed,thecurrentdoubleclosed-loopspeedcontrolsystemwhenthesteady-stateoperation,thetworegulatorinputvoltageandoutputvoltagedeviationisthenumber?A:Thespeedandcurre
5、ntdualclosed-loopspeedcontrolsystemwhenthesteady-stateoperation,thetworegulatorsaretheinputbiasvoltageiszero,bytheformulan=Un=Un*,n=n;Uim*=Idm,Idm=Idl.(3)Inthespeedandcurrentdualclosed-loopspeedcontrolsystem,thetworegulatorsarePIregulator.Whenthesystemisrunn
6、ingwithratedload,thespeedfeedbacklinesuddenlydisconnected,thesystemre-enterthesteady-state,thecurrentregulatoristheinputbiasvoltagetozero?Why?A:Whenthesystemisrunningwithratedload,thespeedfeedbacklinesuddenlydisconnected,thenUn=0,=Un*-Un=Un*,sothatUitoreachU
7、im,0,rateofincreaseinn,whenthesystemafterre-enteringthesteady-state,thatis,Id=Idl,then,=Uim*-Idl0,arenolongerchanges,changesinrotationalspeednisnolonger,butatthistimethantherotationalspeednatthetimeofthefeedbacklinespeedtobreakbig.(4)Whyisthespeedwithintegra
8、lcontrolsystemisnotstaticpoor?A:Speedregulatorintegralsystem,toachievenon-staticerrorisduetothecharacteristicsofintegralcontrolregulator,thatis,theaccumulationofpointsandtheroleofmemory.(5)Doubl
