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小电流脉冲TIG弧的谐振现象及其交流阻抗特性分析
牛永1, 宋永伦2, 曾周末1
1.天津大学精密测试技术及仪器国家重点实验室, 天津 300072;2.北京工业大学机械工程与应用电子技术学院, 北京 100124
摘要:
采用直流叠加高频正弦的方法对小电流TIG弧的交流阻抗特性进行了研究,发现随频率的增大,电弧阻抗的模量先增大随后又减小;而其复角随频率的增大持续减小,在模量的最大值减小为零,很显然,电弧阻抗存在谐振点.经过对不同频率的激励电流和响应电压进行数据分析,得到了小电流TIG弧的高频动态阻抗电路模型以及传递函数.应用数学分析软件拟合出小电流TIG弧的阻抗曲线,确定了在测试条件下模型中的参数,并计算出电弧的谐振频率.
关键词:  脉冲电弧  电弧模型  谐振  动态阻抗
DOI:
分类号:
基金项目:国家自然科学基金资助项目(503755005)
Resonance phenomenon of small current pulsed TIG arc and analysis of AC impedance features
NIU Yong1, SONG Yonglun2, ZENG Zhoumo1
1.State Key Laboratory of Precision Measurement Technology and Instruments, Tianjin University, Tianjin 300072, China;2.College of Mechanical Engineering & Applied Electronics Technology, Beijing University of Technology, Beijing 100124, China
Abstract:
A method that alternating sine current superposes on direct current was adopted for study on alternating current impedance of the small current TIG arc.It was found that with the frequency getting high,the modulus of arc impedance increased and then decreased,and the phase angle decreased continuously.The maximum of the modulus just coincided with the zero point of phase angle,and obviously,arc impedance had a resonance.By analyzing the voltage and current data in many different frequencies,the electronic model and transfer function of TIG arc alternative component were deduced.The parameters of transfer function were fit by using mathematics software,and the resonance frequency was calculated.
Key words:  pulsed arc  arc modulus  resonance  dynamic impedance