外文翻译双闭环直流调速系统的说明Word格式文档下载.docx

外文翻译双闭环直流调速系统的说明Word格式文档下载.docx

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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?

Thespeedandcurrentdualclosed-loopspeedcontrolsystemwhenthesteady-stateoperation,thetworegulatorsaretheinputbiasvoltageiszero,bytheformulan=Un=Un*,n=n;

Uim*=Idm,Idm=Idl.

（3）Inthespeedandcurrentdualclosed-loopspeedcontrolsystem,thetworegulatorsarePIregulator.Whenthesystemisrunningwithratedload,thespeedfeedbacklinesuddenlydisconnected,thesystemre-enterthesteady-state,thecurrentregulatoristheinputbiasvoltagetozero?

Why?

Whenthesystemisrunningwithratedload,thespeedfeedbacklinesuddenlydisconnected,thenUn=0,=Un*-Un=Un*,sothatUitoreachUim,0,rateofincreaseinn,whenthesystemafterre-enteringthesteady-state,thatis,Id=Idl,then,=Uim*-Idl0,arenolongerchanges,changesinrotationalspeednisnolonger,butatthistimethantherotationalspeednatthetimeofthefeedbacklinespeedtobreakbig.

（4）Whyisthespeedwithintegralcontrolsystemisnotstaticpoor?

Speedregulatorintegralsystem,toachievenon-staticerrorisduetothecharacteristicsofintegralcontrolregulator,thatis,theaccumulationofpointsandtheroleofmemory.

（5）Double-loopspeedcontrolsystem（PI）,loadchanges,Idl>

Idm,askedbicyclolspeedcontrolsystemASRandACRhow-conditioning,theresult?

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-loopspeedcontrolsystemcomponentsinFigure1.1Currentloop:

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

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

（2）.Double-loopspeedcontrolsystemofthetypicalworkingcondition

1）Start（orthespeed）:

STinthestart-upprocesshasbeensaturated,sothatthespeedofthisloopintheequivalentopen-loopstate.Systemonlyintheconstantcurrentloopundertheregulationtoensurethemotorataconstantcurrentofthemaximumallowableunderthestart-up.

Figure1double-loopspeedcontrolsystemstructure

2）slowdown（orstop）:

STatthistimetoreachtheoutputamplitudeofthereverselimit.Maincircuitcurrentbythebridgeisreducedtozeroaftertheinverter.LTandCSRoutputwillsoonreachthemaximumreverse.CFpulseoutputtoreachβmin,currentloopforopen-loop.motortorqueunderdecelerationuntilthemotorspeedclosetothegivennewvalue,currentloopandspeedlooponeafteranotherintotheclosed-loopwork,motorinthenewvalueofagivenrun.

3）Gridvoltagefluctuation:

Thismotorbecauseofthelargermomentofinertia,whichcausedthefirstchangeinarmaturecurrent,SToutputalsodidnotchangetheeffectofcurrentloop,LTrapidlychangingtheoutputsothatangleαbeadjustedquickly,sotheimpactonthespeed.

4）Smallchangesinload:

intheoperation,loadchanges,willcausethemotorspeeddeviationfromthegivenvalue.speeduptherecoveryprocessandtheaforementionedspeed（ordeceleration）issimilartotheprocess.

2.CommonFaultAnalysisandProcessing

（1）Thenormalsupplyvoltage,thyristorrectifieroutputwaveformarrhythmiacausedbythisphenomenonisduetotriggersawtoothslopecausedinconsistency.Sawtoothslopeadjustpotentiometer,theoutputwaveformuniformitycouldbeachieved.intheadjustmentprocesstostrikeabalancebetweenQi,thispointshouldbepaidattentiontotheactualdebugging.

（2）DCMotorAnalysisofmechanicalpropertiesofsoftthyristorDCmotorsystem,whenthecurrentintermittentmechanicalpropertieswhenthefirstno-loadspeedischaracterizedbyhighideals,andthesecondischaracterizedbymechanicalpropertiesofsoft.Theso-calledmechanicalfeaturessoft,thatis,smallchangesinloadwillcausegreatchangesinspeed.oscilloscopetoobservewhenusingthebridgerectifieroutputwaveform,onemayfindthatmissingrelative.atthistimeneedtocheckwhetherthetriggerhaspulseoutput,fastwhetherthefusemelting,whetherthebreakdownorthyristorcircuit,synchronoustransformerisdamaged,whetherthelackofpower.toidentifytheproblems,canberesolved.

（3）Thespeedofthespeedofinstabilitycausedbymanyfactorsofinstability:

1）Electricgunsarenotfirmlyfixedorwiththehostofdifferentaxis.

2）Theparametersofthespeedregulatorinappropriate.Respondtothedynamicparameterstoadjust（changetheratioofintegralparameters）.

3）Ofaspeedcontrolsystemthereare（orbad）

4）Maybecausedasaresultofinterference.shouldbefoundtointerferewiththereasonsfortakinganti-jammingmeasures.

（4）Alittletothesetratedmotorspeedishigherthanthatshouldfirstcheckwhetheritisnormalfortheexternalcontrolsystem,suchasoutsidethenormalcontrolsystem,itmaybegivenpoints,speedregulator,currentregulator,suchascausedbylinkfailure.Shouldbecutoffthemaincircuitpowersupply,onlythecontrolsystemtotheelectricity,notagiveninthecase,testingeachofthekeypoints（suchasthecurrentregulator,voltageregulator,etc.ofthepotential.andthengiventogetherwiththeformertoonebyoneaftereachofthekeypointstocheckthepotentialchanges,youcanfindoutthefaultlies.

（5）Bridgerectifieroutputvoltageisnothighstressed

1）thespeedregulatorandcurrentregulatorlimitertoosmall,shouldbeliberalized

inaccordancewithappropriateamplitudethreshold.

2）thanthespeedfeedbacksignal,inthattheycanreducetherateofappropriatefeedbacksignals.

（6）Tothetimingsystemstillintheabsenceoflow-speedoperation（thatis,thephenomenonofemergenceofreptiles）Thisisbecausethesystemof"

zerodrift"

causedby.Whentheinputsignaliszero,theoutputvoltagebytheinputamplificationstageoftheoffsetpotentiometerdecisionscanbeoffsetbyadjustingthepotentialallowsα=90°

atthistimetozerooutputvoltagerectificationsystem,theelectricalwillnotcrawl.

（7）Withagivensystemcannotrun

Shouldfirstcheckwhetheritisnormalfortheexternalcontrolsystem,suchasoutsidethenormalcontrolsystem,itmaybegivenpoints,speedregulator,current

regulator,suchascausedbylinkfailure.Shallbecutoffmaincircuitpowersupply,onlythecontrolsystemtotheelectricity,notAddthegivencircumstances,thekeypointsofeachtest（suchasthecurrentregulator,voltageregula