机械毕业设计英文外文翻译120电牵引采煤机的开关磁阻电动机.docx
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机械毕业设计英文外文翻译120电牵引采煤机的开关磁阻电动机
SwitchedReluctanceMotorsDriveforthe
ElectricalTractioninShearer
Abstract—ThepaperpresentedthedoubleSwitchedReluctancemotorsparalleldrivesystemfortheelectricaltractioninshearer.Thesystemcomponents,suchastheSwitchedReluctancemotor,themaincircuitofthepowerconverterandthecontroller,weredescribed.Thecontrolstrategiesoftheclosed-looprotorspeedcontrolwithPIalgorithmandbalancingthedistributionoftheloadswithfuzzylogicalgorithmweregiven.Thetestsresultswerealsopresented.ItisshownthattherelativedeviationoftheaverageDCsuppliedcurrentofthepowerconverterintheSwitchedReluctancemotor1andintheSwitchedReluctancemotor2iswithin±10%
Keywords-switchedreluctance;motorcontrol;shearer;coalmine;electricaldrive
I.INTRODUCTION
Theundergroundsurroundingsofthecoalminesareveryexecrable.Oneside,itisthemoist,highdustandinflammablesurroundings.Ontheotherside,thespaceofroadwayislimitedsinceitisnecessarytosavetheinvestmentofexploitingcoalminessothatitisdifficulttomaintaintheequipments.Inthemoderncoalmines,theautomatizationequipmentscouldbeusedwidely.The
faultsoftheautomatizationequipmentscouldaffecttheproductionandthebenefitofthecoalmines.Thesheareristheminingequipmentthatcoalcouldbecutfromthecoalwall.Thetraditionalshearerwasdrivenbythehydrostatictransmissionsystem.Thefaultratioofthehydrostatictransmissionsystemishighsincethefluidinhydrostatictransmissionsystemcouldbepollutedeasily.Thefaultsofthehydrostatictransmissionsystemcouldaffecttheproductionandthebenefitofthecoalminesdirectly.Thefaultratioofthemotordrivesystemislowerthanthatofthehydrostatictransmissionsystem,butitisdifficulttocoolthemotordrivesystemincoalminessincethemotordrivesystemshouldbeinstalledwithintheflameproofenclosureforsafetyprotection.Themotordrivesystemisalsooneofthepivotalpartsintheautomatizationequipments.Thedevelopmentofthenoveltypesofthemotordrivesystemhadbeenattachedimportancetobythecoalmines.TheSwitchedReluctancemotordrivecouldbecomethemainequipmentsforadjustablespeedelectricaldrivesystemincoalmines[1],becauseithasthehighoperationalreliabilityandthefaulttolerantability[2].TheSwitchedReluctancemotordrivemadeupofthedouble-salientpoleSwitchedReluctancemotor,theunipolarpowerconverterandthecontrollerisfirminthemotorandinthepowerconverter.Thereisnobrushstructureinthemotorandnofaultofambipolarpowerconverterinthepowerconverter[3][4].TheSwitchedReluctancemotordrivecouldbeoperatedattheconditionoflackedphasesfaultdependedontheindependenceofeachphaseinthemotorandthepowerconverter[5].Thereisnowindingintherotorsothatthereisnocopperlossinthelossandthereisonlylittleironlossintherotor.Itiseasytocoolthemotorsinceitisnotnecessarytocooltherotor.TheshearerdrivenbytheSwitchedReluctancemotordrivehadbeendeveloped.Thepaperpresentedthedevelopedprototype.
II.SYSTEMCOMPONENTS
ThedevelopedSwitchedReluctancemotorsdrivefortheelectricaltractioninshearerisatypeofthedoubleSwitchedReluctancemotorsparalleldrivesystem.ThesystemismadeupoftwoSwitchedReluctancemotors,acontrolboxinstalledthepowerconverterandthecontroller.TheadoptedtwoSwitchedReluctancemotorsareallthree-phase12/8structureSwitchedReluctancemotor,whichwereshowninFigure1.ThetwoSwitchedReluctancemotorswerepackingbytheexplosion-proofenclosure,respectively.Theratedoutputpowerofonemotoris40KWattherotorspeed1155r/min,andtheadjustablespeedrangeisfrom100r/minto1500r/min.
Figure1.Photographofthetwothree-phase12/8structureSwitchedReluctancemotor
Thepowerconverterconsistsoftwothree-phaseasymmetricbridgepowerconverterinparallel.TheIGBTswereusedasthemainswitches.Three-phase380VACpowersourcewasrectificatedandsuppliedtothepowerconverter.ThemaincircuitofthepowerconverterwasshowninFigure2
Figure2.Maincircuitofthepowerconverter
.Inthecontroller,thereweretherotorpositiondetectioncircuit,thecommutationcircuit,thecurrentandvoltageprotectioncircuit,themainswitches’gatedrivercircuitandthedigitalcontrollerforrotorspeedclosed-loopandbalancingthedistributionoftheloads.
III.CONTROLSTRATEGY
ThetwoSwitchedReluctancemotorcouldalldrivetheshearerbythetransmissionoutfitinthesametractionguidewaysothattherotorspeedofthetwoSwitchedReluctancemotorscouldbesynchronized.
Theclosed-looprotorspeedcontrolofthedoubleSwitchedReluctancemotorsparalleldrivesystemcouldbeimplementedbyPIalgorithm.IntheSwitchedReluctancemotor1,thetriggeredsignalsofthemainswitchesinthepowerconverteraremodulatedbyPWMsignal,thecomparisonofthegivenrotorspeedandthepracticalrotorspeedaremadeandthedutyratioofPWMsignalareregulatedasfollows,
where,
isthegivenrotorspeed,
isthepracticalrotorspeed,
isthedifferenceoftherotorspeed,
istheincrementofthedutyratioofPWMsignaloftheSwitchedReluctancemotor1atktime,
istheintegralcoefficient,
istheproportioncoefficient,ekisthedifferenceoftherotorspeedatktime,ek-1isthedifferenceoftherotorspeedatk-1time,D1(k)isthedutyratioofPWMsignaloftheSwitchedReluctancemotor1atktime,andD1(k-1)isthedutyratioofPWMsignaloftheSwitchedReluctancemotor1atk-1time.TheoutputpoweroftheSwitchedReluctancemotordrivesystemisapproximatelyinproportiontotheaverageDCsuppliedcurrentofthepowerconverterasfollows,
where,P2istheoutputpoweroftheSwitchedReluctancemotordrivesystem,IinistheaverageDCsuppliedcurrentofthepowerconverter.
IntheSwitchedReluctancemotor2,thetriggeredsignalsofthemainswitchesinthepowerconverterarealsomodulatedbyPWMsignal.ThebalancingthedistributionoftheloadsbetweenthetwoSwitchedReluctancemotorscouldbeimplementedbyfuzzylogicalgorithm.Inthefuzzylogicregulator,therearetwoinputcontrolparameters,oneisthedeviationoftheaverageDCsuppliedcurrentofthepowerconverterbetweenthetwoSwitchedReluctancemotors,andtheotheristhevariationofthedeviationoftheaverageDCsuppliedcurrentofthepowerconverterbetweenthetwoSwitchedReluctancemotors.TheoutputcontrolparameteristheincrementofthedutyratioofthePWMsignaloftheSwitchedReluctancemotor2.TheblockdiagramofthedoubleSwitchedReluctancemotorsparalleldrivesystemfortheelectricaltractioninshearerwasshowninFigure3.
Figure3.BlockdiagramofthedoubleSwitchedReluctancemotorsparalleldrivesystemfortheelectricaltractioninshearer
ThedeviationoftheaverageDCsuppliedcurrentofthepowerconverterbetweenthetwoSwitchedReluctancemotorsatthemomentoftiis
where,Iin1isthepracticalaverageDCsuppliedcurrentofthepowerconverterintheSwitchedReluctancemotor1atthemomentofti,Iin2isthepracticalaverageDCsuppliedcurrentofthepowerconverterintheSwitchedReluctancemotor2atthemomentofti.
ThevariationofthedeviationoftheaverageDCsuppliedcurrentofthepowerconverterbetweenthetwoSwitchedReluctancemotorsatthemomentoftiis
where,ei-1isthedeviationoftheaverageDCsuppliedcurrentofthepowerconverterbetweenthetwoSwitchedReluctancemotorsatthemomentofti-1.
ThedutyratioofthePWMsignaloftheSwitchedReluctancemotor2atthemomentoftiis
where,ΔD2(i)istheincrementofthedutyratioofthePWMsignaloftheSwitchedReluctancemotor2atthemomentoftiandD2(i-1)isthedutyratioofthePWMsignaloftheSwitchedReluctancemotor2atthemomentofti-1.
Thefuzzylogicalgorithmcouldbeexpressedasfollows,
where,EisthefuzzysetofthedeviationoftheaverageDCsuppliedcurrentofthepowerconverterbetweenthetwoSwitchedReluctancemotors,ECisthefuzzysetofthevariationofthedeviationoftheaverageDCsuppliedcurrentofthepowerconverterbetweenthetwoSwitchedReluctancemotors,andUisthefuzzysetoftheincrementofthedutyratioofthePWMsignaloftheSwitchedReluctancemotor2.
ThecontinuousdeviationoftheaverageDCsuppliedcurrentofthepowerconverterbetweenthetwoSwitchedReluctancemotorscouldbechangedintothediscreteamountattheinterval[-5,+5],basedontheequationsasfollows,
ThecontinuousvariationofthedeviationoftheaverageDCsuppliedcurrentofthepowerconverterbetweenthetwoSwitchedReluctancemotorscouldalsobechangedintothediscreteamountattheinterval[-5,+5],basedontheequationsasfollows,
ThediscreteincrementofthedutyratioofPWMsignaloftheSwitchedReluctancemotor2attheinterval[-5,+5]couldbechangedintothecontinuousamountattheinterval[-1.0%,+1.0%],basedontheequationsasfollows,
Thereisadecisionformsofthefuzzylogicalgorithmbasedontheaboveprinciples,whichwasstoredintheprogrammestoragecellofthecontroller.
WhilethedifferenceofthedistributionoftheloadsbetweenthetwoSwitchedReluctancemotorscouldbegot,thedutyratioofPWMsignaloftheSwitchedReluctancemotor2willberegulatedbasedonthedecisionformsofthefuzzylogicalgorithmandthedistributionoftheloadsbetweenthetwoSwitchedReluctancemotorscouldbebalanced.
IV.TESTEDRESULTS
ThedevelopeddoubleSwitchedReluctancemotorsparalleldrivesystemproto