【硕士论文】基于DSP的逆变埋弧焊机控制系统的研制.pdf

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1、THERESEARCHONTHECONTROLSYSTEMOFSUBMERGEDARCWELDINGMACHINEBASEDONDSPApplicant:WeiShuangchengSupervisor:QiBojinABSTRACTTheofcontrolsystemofsubmergedarcinverterissummarized.Analogcontrolsystem,semi-digitalcontrolsystembasedonsingle-chip-computeranddigitalcontrolsystemarecompared.Itispointedthatthedi

2、gitalcontrolisthedevelopmenttrendofcontrolsystem.Constantwire-feedarccontrolandeven-adjustingarccontrolsystemsubmergedarcweldingprocessarediscussedindetail.Thecharacteristicsofarcaredescribed.Atheoreticfoundationtothedesigningofdigitalcontrolsystemofthesubmergedarcwelderhasbeenestablished.TMS320F

3、240isdesignedbyTICompanyforthecontrolofmotorandinverterspecially.Thehardwareofthesubmergedarcweldercontrolsystembasedonithasbeendeveloped,whichisconstitutedoftheminisystemofDSP,theselectioncircuitofoutputcharacteristic,theidentificationcircuitofweldingwire,andtheinterfacebetweenoperatorandthemach

4、ine.Thedigitalcontroldrivingpowersourceofweldingtractorisdesignedinordertocontrolthewirefeedrateandweldingspeedaccurately.Accordingtothetheoryofarccontrol,correspondingsoftwarehasbeendesignedwithPIarithmetictomaketheweldingmachineoperatesteadily.Boththeweldingpowersourceandthedrivingpowersourceof

5、weldingtractorareallhigh-frequencyswitchpowersources.Theyhaveinevitableelectromagneticinterferencetothedigitalcontrolsystem.Theoriginsandntionsofthearedescribedinthethesis,andsomehardwareandsoftwarehasbeendevelopedtoimprovetheperformanceofthedigitalcontrolsystem.Keywords:submergedarcwelding,digit

6、alcontrol,electromotor,DSP文中所用物理量的符号和单位法定计量单位量的名称符号单位名称单位符号电容C法F电压U伏特V电流I安培人电感L亨利H电阻R欧姆Q速度u米每秒m/s频率f赫兹Hz长度I米m时间T秒s磁通〔量3中韦伯Wb转动惯量J千克平方米Kg·m角位移0弧度rad一it京航空航天大学学位论文第一章绪论1.1选题意义埋弧焊是电弧在焊剂层下燃烧进行焊接的一种方法，一般是在自动或半自动下完成焊接，和其他焊接方法相比具有很多特点:(1)埋弧焊生产率高，在焊接时，焊丝从导电嘴伸出长度小，可以提高焊接电流(或电流密度)4^-5倍，因此熔透能力和焊丝熔敷率大大提高，另外由

7、于焊剂和熔渣的隔热作用，电弧散热少、飞溅小，热效率高，可以提高焊接速度，厚度8-10mm钢板对接，单丝埋弧焊接速度可达30^-50m/h.(2)焊缝质量高，埋弧焊时，焊剂和熔渣能有效地保护熔池，并可以降低熔池的冷却速度，从而可以提高焊缝的力学性能。(3)节省焊接材料和能源，较厚的焊件不开坡口也能焊透，省去开坡口和填充坡口所需的能源和时间。(4)劳动条件好，焊接过程的机械化和自动化使得焊工的劳动强度大大降低，有害气体少且没有弧光的有害