机械毕设外文翻译Word格式.docx
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coalmine;
electricaldrive.
I.INTRODUCTION
Theundergroundsurroundingsofthecoalminesareveryexecrable.Oneside,itisthemoist,highdustandinflammablesurroundings.Ontheotherside,thespaceofroadwayislimitedsinceitisnecessarytosavetheinvestmentofexploitingcoalminessothatitisdifficulttomaintaintheequipments.Inthemoderncoalmines,theautomatizationequipmentscouldbeusedwidely.Thefaultsoftheautomatizationequipmentscouldaffecttheproductionandthebenefitofthecoalmines.Thesheareristheminingequipmentthatcoalcouldbecutfromthecoalwall.Thetraditionalshearerwasdrivenbythehydrostatictransmissionsystem.Thefaultratioofthehydrostatictransmissionsystemishighsincethefluidinhydrostatictransmissionsystemcouldbepollutedeasily.Thefaultsofthehydrostatictransmissionsystemcouldaffecttheproductionandthebenefitofthecoalminesdirectly.Thefaultratioofthemotordrivesystemislowerthanthatofthehydrostatictransmissionsystem,butitisdifficulttocoolthemotordrivesystemincoalminessincethemotordrivesystemshouldbeinstalledwithintheflameproofenclosureforsafetyprotection.Themotordrivesystemisalsooneofthepivotalpartsintheautomatizationequipments.Thedevelopmentofthenoveltypesofthemotordrivesystemhadbeenattachedimportancetobythecoalmines.TheSwitchedReluctancemotordrivecouldbecomethemainequipmentsforadjustablespeedelectricaldrivesystemincoalmines[1],becauseithasthehighoperationalreliabilityandthefaulttolerantability[2].TheSwitchedReluctancemotordrivemadeupofthedouble-salientpoleSwitchedReluctancemotor,theunipolarpowerconverterandthecontrollerisfirminthemotorandinthepowerconverter.Thereisnobrushstructureinthemotorandnofaultofambipolarpowerconverterinthepowerconverter[3][4].TheSwitchedReluctancemotordrivecouldbeoperatedattheconditionoflackedphasesfaultdependedontheindependenceofeachphaseinthemotorandthepowerconverter[5].Thereisnowindingintherotorsothatthereisnocopperlossinthelossandthereisonlylittleironlossintherotor.Itiseasytocoolthemotorsinceitisnotnecessarytocooltherotor.Theshearerdrivenbythe
SwitchedReluctancemotordrivehadbeendeveloped.Thepaperpresentedthedevelopedprototype.
II.SYSTEMCOMPONENTS
ThedevelopedSwitchedReluctancemotorsdrivefortheelectricaltractioninshearerisatypeofthedoubleSwitchedReluctancemotorsparalleldrivesystem.ThesystemismadeupoftwoSwitchedReluctancemotors;
acontrolbox
installedthepowerconverterandthecontroller.TheadoptedtwoSwitchedReluctancemotorsareallthree-phase12/8structureSwitchedReluctancemotor,whichwereshowninFigure1.Figure1.Photographofthetwothree-phase.12/8structureSwitchedReluctancemotor
ThetwoSwitchedReluctancemotorswerepackingbytheexplosion-proofenclosure,respectively.Theratedoutputpowerofonemotoris40KWattherotorspeed1155r/min,andtheadjustablespeedrangeisfrom100r/minto1500r/min.
Thepowerconverterconsistsoftwothree-phaseasymmetricbridgepowerconverterinparallel.TheIGBTswereusedasthemainswitches.Three-phase380VACpowersourcewascertificatedandsuppliedtothepowerconverter.ThemaincircuitofthepowerconverterwasshowninFigure2.
Inthecontroller,thereweretherotorpositiondetectioncircuit,thecommutationcircuit,thecurrentandvoltageprotectioncircuit,themainswitches’gatedrivercircuitandthedigitalcontrollerforrotorspeedclosed-loopandbalancingthedistributionoftheloads.
III.CONTROLSTRATEGY
ThetwoSwitchedReluctancemotorcouldalldrivetheshearerbythetransmissionoutfitinthesametractionguidewaysothattherotorspeedofthetwoSwitchedReluctancemotorscouldbesynchronized.
Theclosed-looprotorspeedcontrolofthedoubleSwitchedReluctancemotorsparalleldrivesystemcouldbeimplementedbyPIalgorithm.IntheSwitchedReluctancemotor1,thetriggeredsignalsofthemainswitchesinthepowerconverteraremodulatedbyPWMsignal,thecomparisonofthegivenrotorspeedandthepracticalrotorspeedaremadeandthedutyratioofPWMsignalareregulatedasfollows,
where,ngisthegivenrotorspeed,nfisthepracticalrotor
speed,eisthedifferenceoftherotorspeed,
istheincrementofthedutyratioofPWMsignaloftheSwitchedReluctancemotor1atktime,Kiistheintegralcoefficient,Kpistheproportioncoefficient,ekisthedifferenceoftherotorspeedatktime,ek-1isthedifferenceoftherotorspeedatk-1time,D1（k）isthedutyratioofPWMsignaloftheSwitchedReluctancemotor1atktime,andD1（k-1）isthedutyratioofPWMsignaloftheSwitchedReluctancemotor1atk-1time.
TheoutputpoweroftheSwitchedReluctancemotor
drivesystemisapproximatelyinproportiontothe
averageDCsuppliedcurrentofthepowerconverteras
follows,
where,P2istheoutputpoweroftheSwitchedReluctancemotordrivesystem,IinistheaverageDCsuppliedcurrentofthepowerconverter.
IntheSwitchedReluctancemotor2,thetriggeredsignalsofthemainswitchesinthepowerconverterarealsomodulatedbyPWMsignal.ThebalancingthedistributionoftheloadsbetweenthetwoSwitchedReluctancemotorscouldbeimplementedbyfuzzylogicalgorithm.Inthefuzzylogicregulator,therearetwoinputcontrolparameters,oneisthedeviationoftheaverageDCsuppliedcurrentofthepowerconverterbetweenthetwoSwitchedReluctancemotors,andtheotheristhevariationofthedeviationoftheaverageDCsuppliedcurrentofthepowerconverterbetweenthetwoSwitchedReluctancemotors.TheoutputcontrolparameteristheincrementofthedutyratioofthePWMsignaloftheSwitchedReluctancemotor2.TheblockdiagramofthedoubleSwitchedReluctancemotorsparalleldrivesystemfortheelectricaltractioninshearerwasshowninFigure3.
ThedeviationoftheaverageDCsuppliedcurrentof
thepowerconverterbetweenthetwoSwitchedReluctancemotorsatthemomentoftiis
:
where,ei-1isthedeviationoftheaverageDCsupplied
currentofthepowerconverterbetweenthetwoSwitched
Reluctancemotorsatthemomentofti-1.ThedutyratioofthePWMsignaloftheSwitchedReluctancemotor2atthemomentoftiis
where,
istheincrementofthedutyratioofthePWMsignaloftheSwitchedReluctancemotor2atthemomentoftiandD2（i-1）isthedutyratioofthePWMsignaloftheSwitchedReluctancemotor2atthemomentofti-1.
Thefuzzylogicalgorithmcouldbeexpressedas
follows,
if
and
thenU~
i=1,2,…,m,j=1,2,…,n
where,E~isthefuzzysetofthedeviationoftheaverageDCsuppliedcurrentofthepowerconverterbetweenthetwoSwitchedReluctancemotors,E~CisthefuzzysetofthevariationofthedeviationoftheaverageDCsuppliedcurrentofthepowerconverterbetweenthetwoSwitchedReluctancemotors,andU~isthefuzzysetoftheincrementofthedutyratioofthePWMsignaloftheSwitchedReluctancemotor2.
ThecontinuousdeviationoftheaverageDCsuppliedcurrentofthepowerconverterbetweenthetwoSwitchedReluctancemotorscouldbechangedintothediscreteamountattheinterval[-5,+5],basedontheequationsasfollows,
ThediscreteincrementofthedutyratioofPWMsignaloftheSwitchedReluctancemotor2attheinterval[-5,+5]couldbechangedintothecontinuousamountattheinterval[-1.0%,+1.0%],basedontheequationsasfollows,
Thereisadecisionformsofthefuzzylogicalgorithmbasedontheaboveprinciples,whichwasstoredintheprogrammestoragecellofthecontroller.
WhilethedifferenceofthedistributionoftheloadsbetweenthetwoSwitchedReluctancemotorscouldbegot,thedutyratioofPWMsignaloftheSwitchedReluctancemotor2willberegulatedbasedonthedecisionformsofthefuzzylogicalgorithmandthedistributionoftheloadsbetweenthetwoSwitchedReluctancemotorscouldbebalanced.
IV.TESTEDRESULTS
ThedevelopeddoubleSwitchedReluctancemotorsparalleldrivesystemprototypehadbeentestedexperimentally.TableIgivesthetestsresults,where
istherelativedeviationoftheaverageDCsuppliedcurrentofthepowerconverterintheSwitchedReluctancemotor1,
istherelativedeviationoftheaverageDCsuppliedcurrentofthepowerconverterintheSwitchedReluctancemotor2,and,
ItisshownthattherelativedeviationoftheaverageDCsuppliedcurrentofthepowerconverterintheSwitched
Reluctancemotor1andintheSwitchedReluctancemotor
2iswithin
V.CONCLUSION
ThepaperpresentedthedoubleSwitchedReluctancemotorsparalleldrivesystemfortheelectricaltractioninshearer.ThenoveltypeoftheshearerincoalminesdrivenbytheSwitchedReluctancemotorsdrivesystemcontributestoreducethefaultratiooftheshearer,enhancetheoper
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