逆变tig焊机引弧噪声的研究

《逆变tig焊机引弧噪声的研究》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、摘要摘要随着电力电子技术的发展，已有越来越多的电力电子产品应用于工业、民用及军事领域，产生了大量的电磁兼容性问题，电磁兼容设计己成为工程设计的一项重要内容。逆变TIG焊机由于其工作的特殊性，电磁兼容性问题十分严重，进行深入研究很有必要。引弧电路产生的电磁噪声是逆变TIG焊机最主要的电磁干扰源，危害严重。本文首先建立了高频引弧电路和引弧电路的仿真模型，并进行了仿真，揭示了其电磁噪声的规律；将高频引弧电路模型与逆变TIG焊机模型相结合，通过仿真，发现了引弧高频噪声对TIG焊机传导干扰影响的规律；最后介绍了高频引弧辐射电磁噪声的测定及其抑制。仿真及实验结果表

2、明，引弧高频及引弧高压脉冲中含有大量高幅值谐波。对焊机电路而言，高频的幅值越高频率越低，所产生的传导干扰也就越大，因此在满足使用的条件下，通过采取降低高频的强度和频率，合理调节电路自身的参数、结构及采取如屏蔽、接地、隔离等方法来有效地减轻电磁干扰。以上研究成果为抑制引弧噪声奠定了理论基础。关键词：逆变TIG弧焊机；高频引弧；高压脉冲引弧；电磁兼容性；电磁噪声电磁干扰；仿真ABSTRACTWiththedevelopmentofpowerelectronictechnology,moreandmorepowerelectronicdevicesappli

3、esatindustry，forciviluseandmilitarydomain，electromagneticcompatibility(EMC)andelectromagneticinterference(EMI)questionsufferedtheuniversalconcern．TheEMCdesignhasbecomeavitalprocessofanynowadaysprojectandaccordinglyEMCwillbeneededinthedeignofweldingequipments．Owingtoitsparticular

4、itythatinvertTIGarcwelderwork，thereforeitsEMCalsolooksmoreprotruding,andtheresearchthatneedtobegonedeepinto．Itisthemajorreasontogiverisetotheelectromagneticnoise(EMN)thattheignitingarcwheninvertTIGafcwelderisworking．thereforetiffsthesisfirstlybuildsthemodelofhighfrequencyignitin

5、garccircuitandhighvoltagepulsestartarccircuit，andthenanalysesthehi萄fequeneyandhighvoltagepulseandunderstoodhisspecialityofinterfere．Thisthesisalsobuildsthemaincircuitandcontrolcircuitandanalysestheconcreteckcumstancestothemofconductioninterferenceofhighfrequency,andlooksforoutth

6、einterferencelaw．ThisthesisintroducedthemeaSUreandrestrainofradiationofthehighfrequencyE姐．Simulationandtheexperimentresultindicates，highfrequencyandhighvoltagepulsecontainsalargenmnberofhighintensityharmonicwave．Themorekttenseandhigheris岫；11frequency,moreseriousisinterfere．Sound

7、ertheconditionofsatisfieduse，EMICallbealleviatedthroughreducingintensityandthefrequencyofhighfrcquency，reaSonablyadjuststheparameterofcircuitselfandstructureandtakesomemeasuresuchaSscreen,groundconnectionandisolationetemethods．Keyword：invertTIOarcwelder；highfrequencystartarc；hig

8、hvoltagepulsestartarc；EMC；EMI；EMN；simulationII独