外文翻译基于SRM的跳汰机自动排料系统.docx

外文翻译基于SRM的跳汰机自动排料系统.docx

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外文翻译基于SRM的跳汰机自动排料系统

翻译部分

英文原文

Auto-dischargingSystemforJiggingMachineBasedonSRM

Abstract-Thispaperintroducesanauto-dischargingsystemforjiggingmachinebasedonswitchedreluctancemotor（SRM）.Inthissystem,SRMisusedtoreplacethetraditionalasynchronousmotor.Thehardwaresystem,controllerandsoftwaredesignmethodsarediscussedinthispaper.AT89C51istakenasthecorecomponentofthespeedregulationcontrollerforSMRandworkswithotherperipheralcircuitstorealizeeffectivecontrolonmotor.Theexperimentshowsthatauto-dischargingsystemforjiggingmachinebasedonSRMisfeasibleandcanplayanimportantroleinstabilizingcleancoalashcontent,reducingcleancoalloss,improvingproductqualityandseparationefficiency.

Keywords：

Jiggingmachine,auto-dischargesystem;switchedreluctancemotor

1.INTRODUCTION

Thejiggingmachineisakindofmechanicalmineralsortingequipmentandoccupiesanimportantpositionintheproductionofthelargemodemcoalpreparationplant.However,theautomationlevelofjiggingmachinehasbeenout-dated.Thebackwardcontrolmodeinjiggingcoalpreparationrestrictstheproductquality,separationefficiencyandprocessability.Oneofthereasonsisthelowerefficiencyofthemotorwhichisusedcommonlyindischargingsystemforjiggingmachine.Howtoimprovetheefficiencyofmotorhasanimportantsignificanceforimprovingcoalpreparationefficiencyandstabilizingproductquality.

　　Switchedreluctancemotor（SRM）withbetterstartcharacteristicsissuitableforstartingfrequentlyinadverseenvironmentalcondition,hightemperatureandevenstrong

vibrationconditionsandkeepshigherefficiency.Basedonthesecharacteristics,weuseswitchedreluctancemotorinsteadofthetraditionalasynchronousmotortodevelop

auto-dischargingsystemforjiggingmachinebasedonSRM.Theexperimentshowsthatauto-dischargingsystemforjiggingmachinebasedonSRMisfeasibleandcanplayanimportantroleinstabilizingcleancoalashcontent,reducingcleancoalloss,improvingproductqualityandseparationefficiency.

II.CONSTITUTIONOFSPEED-REGULATIONSYSTEMFORSWITCHEDRELUCTANCEMOTORS

Thespeed-regulationsystemforswitchedreluctancemotoriscomposedofSRM,powerconverter,controlleranddetector,asshowninFigure1.

Figure.1ThestructureoftheSRMspeed-regulationsystem

1）Switchedreluctancemotor

SwitchedreluctancemotoristhekeycomponentofSRMspeed-regulationsystem.

2）Powerconverter

ThepowerconverterisacircuitdevicethatisusedtodriveSRMandprovidepowerforSRM.Theonandoffstatusofpowerswitchofpowerconverterarecontrolledreasonablytocompletespeedregulating.ThecostofpowerconverteraccountsforalargeproportioninwholeSRMspeed-regulationsystem,thusselectinganddesigningsuitablepowerconverterisoneofkeyfactorsthatimproveperformance-priceratioofSRMspeed-regulationsystem.

3）Controller

Controlleristhecentrumofsystemandwillplayanimportantroleinthesystem.Thefunctionofcontrolleris,accordingtoactualsystemrunningstatus,todealwithexternalinputinstruction,speedfeedbacksignalandfeedbackinformationofcurrentsensorandpositionsensorandtocontroltheworkingstateofmainswitchdeviceinpowerconverter,thus,realizingthecontrolofswitchedreluctancemotorrunningstatus,satisfYingtherunningrequirements.

4）Detector

Inordertoenableswitchedreluctancemotortorun　normally,thecorrespondingphasewindingmustbeconductivewhentherotorgoestocertainpositionandeveryphasewindingsshouldbeswitchedcorrectlyallthetime.Otherwise,motornotonlycannotoperateasper　requirement,butalsothephenomenasuchasmotorreversion,　stoporrotatingrandommayoccur.Inordertoobtaininstantaneouspositionofrotorwhilemotorruns,theangledisplacementsensormustbeinstalledwithinmotortooutputcorrectrotorpositioninformation.Thisisalsoanobviousdifferencebetweenswitchedreluctancemotorandothermotors.

III.USEDESIGNOFCONTROLLERFORSRMSPEED-REGULATIONSYSTEM

ThemethodofcombininghardwarecircuitandsinglechipcomputerisadoptedinthedesignofcontrollerforSRMspeed-regulationsystem.Hardwarecircuittakeschargefastregulationtaskandsingle-chipcomputercompletesthecomplexfunctionssuchaslogicandparametersetting.AT89C51single-chipcomputerisusedasthecorecomponentofcontroller,inaddition,othercontrolcircuitssuchaspositiondetector,currentandvoltagedetector,overcurrentprotection,overvoltageprotection,analoganddigitalinput,outputcircuitaswellasdisplaycircuitandsoon.TheblockdiagramofcontrollerforSRMspeed-regulationsystemisshowninFigure2.

Figure.2Thehardwarestructureofthesystemcontroller

TheAT89C51single-chipcomputeristhekeypartofcontrolleranditsfunctioniscomparingthegivenvalueofexternalrotatespeedwithactualvalueofmotorspeed,then

calculatingcontrollablevariables（mostlyincludingcurrentchoppingbasisIgandmotorwindingfiringangleθon）accordingtopre-establishedPIDregulatingformula,lastly,basedontheexternaloperationrequirements（rotatingclockwiseorcounter-clockwise）andthewaveshapeofpositionsensortodecidephaseoutputsignal.Moreover,thesingle-chipcomputercompletesalsosomedisplayfunctions,forinstance,overvoltage,lowvoltage,overloadingandsystemstatusandsoon.

（1）Positionsensorsignalinputcircuitistheroleofthemotorpositionsensorsignalwaveforminputisprovidedtothemicrocontroller,andalsobothisolationprotectionfunction.Singlechipmicrocomputeraccordingtothecircuitprovidesthewaveformcanbeidentifiedmotorrotorpositionsoastodeterminethecorrespondingoutputsignal,canalsobebasedonthesensorwaveformcycletocalculatethepracticaloperationofthemotorspeedvaluestoPIDoperationsandotherfunctions.

（2）Phaseinterruptioncircuitfunctioniswhenthepositionsensorwaveformchangesstategeneratesaninterruptsignaltothemicroprocessortoprovideaphasesignaloutputtoprepare.

（3）Phaselockedfrequencymultipliercircuitisusedtopositionsensorsignalcyclefrequency.Butthecomputerfromaccurateinconductionangleandcriticalanglecorrespondingtotheoutputsignalisbroken.

（4）A/DconversionandspeedcircuitwhichistobesetbytheusersimulationspeedvaluethroughtheA/Dconversionmoduleconversiontodigitalquantityinputtothecomputer.

（5）Over-voltageandunder-voltageprotectioncircuitwhentheroleofthepowercircuitvoltageexceedsthespecifiedvoltageandcontrolthesupplyvoltageislessthanthegivenvaluetothecomputersendsoutalarmsignalsfrombutmakethecorrespondingtreatmentandprotectivemeasuresofcomputer.

（6）Externaloperationcircuitofthemainroleistouserrequirements,suchasstart,stop,forward,inversion,electric,braking,dynamicandinterlockcontrolinformationinputtothecomputer,aswellaswithexternalisolationeffect.

（7）Resetcircuitismainlydividedinto:

poweronreset,manualresetandautomaticreset.Whenasystemfailurebydividedsothatitsreturntoanormalstate.

（8）Displaycircuitfunctionstodisplaytheworkingstatusofmotorspeedcontrolsystem.Mainlyagivenspeeddisplay,thegivenspeedandactualspeedsynchronization,overloadandlocked-rotordisplay,over-voltageandunder-voltagedisplay,displayandpowersupplydisplayoperation.

（9）SignaloutputinterfacecircuitisusedtooutputofthesinglechipcomputercorrespondingsignaloutputtotheexternalinterfacecircuitsoastointerfacewithMCUisolationeffect;steeringcontrolcircuit'sfunctionaccordingtouser'soperationrequirementstodeterminethemotorrunningsteering:

thepositiverotationandthereverserotation.

（10）D/Aconversionandlowspeedchoppercircuitiswhenthemotorisrunningbelowthelowspeedregion,thecontrolledvariablesthroughtheD/Aconverterconvertstheanalogquantityandthewindingofthemotortotherebycontroltheactualcurrentvalueiscomparedtothemotorwindingcurrentpeak.

（11）Currentlimitingprotectioncircuitwhentheroleofthemotorwindingcurrentexceedsaratedcurrentvaluewhentheoutputsignalsothatalltheoutputsignalofthephaseintheoffstate,protectsthemaincircuitoflargepowertransistorandtheeffectofmotorwinding.

（12）Logicandcircuitistheroleofthethreesignalprocessinglogicandthenoutputtothecorrespondingpushcircuitisamplifiedtodrivethepowercircuit,isolation.

IV.SOFTWAREDESIGNOFCONTROLLERFORSRMSPEED-REGULATIONSYSTEM

TheprogrammingofcontrollersoftwareusesassemblylanguageofAT89C51single-chipcomputer.Modularizationdesignisadoptedtoincreasereadabilityandportability.Forthissystem,thecontrolsoftwareshouldmeetfollowingrequirements:

1）Toassurethatmotorstartswithoutdeadzoneandpossesseslargeenoughstarttorquetodecreasetorquepulsatingduringstarting.

2）Tobecapableofrealizingmotortransitionsmoothlybetweentwoworkingstatus,thatis,lowspeedcurrentchoppingandhighspeedangleposition.

3）Tobeabletoreceiveandjudgeexternalfaultsignalsandprotectionsignals,todiagnoseanddisplayfaultsandtakecorrespondingpreventionmeasures.

4）Tousemodularizationmethodinsoftwareprogramming,togeneraterelationshipasfewaspossiblebetweensubroutinesandtransmitparametersbyvariablesandflags.

Thesoftwareprogrammingincludesmain,startupmodule,runningmoduleandphaseinterruptmodule.TheflowchartofmainprogramisshowninFigure3.

Figure.3Thehardwarestructureofthesystemcontroller

V.AUTO-DISCHARGINGSYSTEMFORJIGGINGMACHINEBA