电动机无级调速毕业设计外文翻译资料.docx

电动机无级调速毕业设计外文翻译资料.docx

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电动机无级调速毕业设计外文翻译资料

Ⅰ.systemanalysisandsynthesis

1．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.

（5）Double-loopspeedcontrolsystem（PI）,loadchanges,Idl>Idm,askedbicyclolspeedcontrolsystemASRandACRhow-conditioning,theresult?

A:

Whentheloadchanges,Idl>Idm,speeddecreasedrapidly,thecurrentIdsoontoIdm,andoflimitedamplitude,rapidrateofASRsaturation,ACRhasbeenlimitingconditions,toformablockingphenomenon,long-runningwilldamagethesystem.

2.System

SpeedregulatorandcurrentregulatorintheDoubleLoopDCMotorControlSystemcanbesummarizedasfollows:

（1）.Theroleofspeedregulator

Speedregulatorisaspeedcontrolsystemofthedominantregulator,whichallowsspeednwillsoonchangewithagivenvoltageUn*changesinsteady-statespeederrorcanbereduced,ifthePIregulatorcanachievethenon-staticerror.

1）Theeffectofloadchangesintheroleofanti-disturbance.

 2）Theoutputamplitudeofthedecisionlimitthemaximumallowablemotorcurrent.

（2）Theroleofcurrentregulator

1）Asaregulatoroftheinnerring,outerringatthespeedoftheadjustmentprocess,itmakesthecurrentcloselyfollowedthegivenvoltageUi*（thatis,theouterringmodulatoroutput）changes.

    2）Fluctuationsinvoltagefromtheroleofdisturbancerejectionintime.

3）Thespeedofthedynamicprocessofensuringthatthemaximumallowablemotorcurrent,therebyspeedingupthedynamicprocess.

4）Whenthemotoroverloadorstallwhenthearmaturecurrentlimitofthemaximum,automaticprotectionfromtheroleofacceleration.Oncethefaultdisappears,thesystemautomaticallyreturntonormal.Yesterday,theroleofthereliableoperationisveryimportant.

Ⅱdouble-loopspeedcontrolsystemcommonfaultsanalysis

1.Introductionofasystem

（1）.Double-loopspeedcontrolsystemcomponentsinFigure1.Currentloop:

fromthecurrentregulatorLT,triggerCF（inputtransformationfortheCSR）,silicon-controlledrectifierbridge,motorarmatureandcurrentlooptransformLBcomponent.thespeedofouterring:

thespeedregulatorfromST,currentloop,suchaslinkinertia,motorandloadmomentofinertiaandthespeedoftransformationcomponentsSB.inthedouble-loopspeedcontrolsystem,thespeedofthedecisionloopoftherunningcharacteristicsofthewholesystemandstability,andplayaleadingrole,andtochangethecurrentringplaystheroleoftheinternalstructureofthesystemisdependent,butsinceitisasawholetoparticipateintheclosed-loopspeedtothespeedofadirectimpactontheworkoftheclosed-loop,itmustfirstgooddebuggingcurrentloop,andthentestingthespeedofouterring,sothatthewholesystemhasgooddynamicperformance.

（2）.Dou