波形控制逆變CO-,2-焊機的研制.pdf

1、河海大學碩士學位論文波形控制逆變CO焊機的研制姓名：龍火軍申請學位級別：碩士專業(yè)：材料加工工程指導教師：田松亞20050301ABSTRACTThesignaldetectingcircuittheconstant—speedwire—feedingcircuitandtheprogrammedcontrolsystemduringtheshortcircuitofC02(CarbonDioxide)weldingarealldesig

2、nedanddebuggedinthedissertationTheSjgnalofarcvoltagewithoutdistortioniSgotbyuseofphotocoupledisolator6N136toinsulatesignalvoltagefromarcvoltageAndtherelativeappropriatevoltagedetectingthesignalofshortcircuitiSprovidedThe

3、liquidbridgeshrinkdetectingcircuitbasedondu／dtiSdesignedTheclippingcircuitisappliedtoeliminatetheeffectontheliquidbridgeshrinkdetectingcircuitfromarevoltagesuccessfully，whichimprovesthecapabilityofantijammingofitThecontr

4、01systembasedonmicrocomputer803liSdevisedwhichcanpre—setuptheparameters，collectthedataandprotectitselEThesignalofshort—circuitwhichperiodistoosmalliSeliminatedbymeansofsoftwaretoensurethevalidityofsignalprocessingandimpr

5、ovesthecapabilityofantijammingofthecontrolsystemThecircuitmodelofIGBT(InsulatedGateBipolarTransistor)duringswitchisdevisedaftertheinversionmaincircuitofweldingmachinewasanalyzedThevoltagewaveforillfromthemodelhasastrongr

6、esemblancetothevoltagewaveformfromtheexperiment，whichshowsthatthemodelcanprovidethereferencefortheresearchofon—offprocessofIGB工Comparedthevoltagenegativefeedbackwire—feedingspeedregulationsystemsupportedbycurrentpositive

7、feedbackwiththerotationalspeednegativefeedbackregulationsystem，theequivalentconditionofthetwosystemsiSobtainedThenawire—feedingspeedregulationcircuitfortheC02weldingmachineisdesignedbasedonTL494chip，whichhastheselfprotec

8、tivefunctionundertheconditionofcurtentoverloadingIntheexperiments，whenthepowervoltagevariesfrom342Vto41Byandtheloadfrom25Nto50N，thevariationratioofthewirefeedingspeedissmallthan5％，whichsatisfiestheJB／T9533～999professiona