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1、ABSTRACTMostoftowercranesusemulti-speedorwoundrotorelectricmotortoregulatetheirspeedofmechanism.Thiswayhasmanydisadvantages.Itcannotobtainenoughlowerspeedatthestart-stoptodebaseshockpulseandvibrationwhichmayinducehitaccidents.Theelectricmotorshavecomplexcon
2、stitutionsuchasbrushgearorslipringwhichneedsmaintenanceandrepairing.Theelectriccontrolsystemcontainsmanycontactorsandrelaysfrequentlyclosingandopening.Thismayresultelectricpartsdamagedbecauseoflargepulsecurrent.Toimprovethetraditionalspeedregulationintowerc
3、raneisrequired.VariablefrequencyspeedregulationtechnologycombinedwithPLCisoneofthebestwaystoimprovetheperformanceoftowercranes.TheACinverterprovidessufficientprotectionsuchasover-heating,over-current,over-voltage,under-voltage,open-phaseetc.Theinvertercanse
4、tparametersbydigitaloperatordisplayorinputterminal,andprovideseveralcontrolmethodssuchascloseloopvector,openloopvector,V/FwithorwithoutPG.TheinvertersupplywithScurveaccelerationordeceleration,dwellfunctionsanddroopcontrol.Thesecanprovidetowercaneslowerarriv
5、alspeed,smallshockpulse,zerospeedbraking,simplewireconnecting,energysaving,andhighreliability.Thearticleintroducestheapplicationoftheinverterintowercrane’slifting,trolley,andslewingmechanisminmodeofvectorcontrolorV/F,andillustratewithfigure.Comparedwithtrad
6、itionaltowercranecontrolsystem,variablefrequencyspeedcontrolhasadvantagesinsafe,reliabilityandenergysaving.Keywords:Towercrane,Variable－frequencyspeedregulation,Vectorcontrol,PLC目录中文摘要.........................................................................
7、.................................................................I英文摘要.........................................................................................................................................II1绪论.............................................
8、............................................................................................11.1课题背景.....................................................................................................
