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.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
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