中低速磁浮列车悬浮斩波器优化分析

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1、万方数据西南交通大学硕士研究生学位论文第1I页AbstractComparedwithtraditionalrailtrain,themaglevtrainhastheadvantagesoflessnoise。strongclimbingabilityandsmallturningradius．Forthecityrailtransit，thelow-mediumspeedmaglevtrainisaverycompetitiveplanofpublictransportation．T11ispaperstudythesuspendedchopperw

2、hichisthekeydeviceforcontrollingthesuspendedheightofthemaglevtrain．ThispapercooperatedwithTongjiUniversity“ChopperOptimizationofLow—mediumSpeedMaglevExperimentalLine"’project，byutilizingnewdevicesandnewcircuitstructure，tooptimizetheexistingchopperinweight，volumeandefficiency．Tlli

3、SarticlestartwiththeanalysisaboutmaincircuitstructureoftheexistingShanghaiLinganglow-middlespeedtrainmaglevchopper,throughtheanalysisoftheoryandsimulation,foundtheexistingproblems．First,thebuscapacitorCallnotbedischarged，ifthechopperpower-failsuddenlyandstopworking，allenergyinsus

4、pensionelectromagnettransferredtobuscapacitor,asaresult，capacitorvoltagewillbeincreased．Soonlytousehighvoltagebuscapacitancewithlargecapacityandutilizelargepowerdevices．Second，thechargingcontactoriSthesametypeofmaincontactor,thisincreasethesizeandweightofthechopper,andalsoaddthec

5、ost．Third,thechopperusedthe1200VIGBTmoduleastheswitchingdevice，withmuchloss，andwithfanforcedintocooling，whichalsoleadtomassnoise．Fourth，wiresareusedforelectricalconnectioninsidechoppeLwhichisnotconvenientforproductionandmaintenance．Consideringproblemsintheexistingchopper，redesign

6、thechoppermaincircuit，thenverifiedbysimulationwhichinordertominimizethevol磁ne，weightandnoise，improveefficiencyandstability．Theoptimizedofdesignmainlycontainthefollowingfourpoints，first，usechopperswitchcircuitinsteadofchargecontactor,whichcancontrolchargecurrentatstartingandprovid

7、einputovercurrentprotection；second，addthebusdischargecircuit，whichCanreleasetheenergytransferredfromelectromagnettothefiltercapacitorwhenpoweroffsuddenly；third,using650VMOSFETswitchasthepowerswitchdevice，replacethe1200VIGBT．thisreduceswitchingloss；fourth，duetodecreaseofheat,cooli

8、ngfaniScanceled，thisreducedthenoiseofthe