基于罗氏线圈的电阻点焊电流长时间检测  

Long-time Measurement of Resistance Spot Welding Current Based on Rogowski Coil

作　　者：容爱琼 曾家铨 黄增好 邓达强 RONG Aiqiong;ZENG Jiaquan;HUANG Zenghao;DENG Daqiang(School of Robotics Engineering,Guangzhou City University of Technology,Guangzhou 510800,China;School of Mechanical and Automotive Engineering,South China University of Technology,Guangzhou 510640,China;Guangzhou Jing Yuan Electrical Equiment Co.,Ltd.,Guangzhou 510700,China)

机构地区：[1]广州城市理工学院机器人工程学院,广东广州510800 [2]华南理工大学机械与汽车工程学院,广东广州510640 [3]广州市精源电子设备有限公司,广东广州510700

出　　处：《热加工工艺》2022年第11期150-154,共5页Hot Working Technology

基　　金：广东省民办教育发展专项资金项目(52MJZ19001);广州城市理工学院高等教育教学改革项目(52JY210306)。

摘　　要：为实现电阻点焊电流的长时间准确检测并提高其工程适用性,分析了基于罗氏线圈的电流检测电路模型,提出了针对运算放大器不同失调特性的漂移补偿方法。根据叠加原理推导运放失调电压和失调电流对电流检测电路积分漂移的影响,根据运放不同的失调特性设计相应的漂移补偿方法。搭建实验平台,对检测电路理论分析和漂移补偿方法进行了验证。结果表明,被测电流与积分电压输出的理论关系分析较为准确,相对误差约为-5%;所述补偿方法可分别适用于运放两种不同的失调特性,实现电阻点焊电流的长时间检测。In order to realize long-time accurate measurement of resistance spot welding current and improve its engineering applicability, the circuit model of current measurement based on Rogowski coil was analyzed, and drift compensation methods were proposed for different offset characteristics of operational amplifiers. The effect of offset voltage and offset current on the integration drift of current measurement circuit was deduced based on superposition principle, and different drift compensation methods were designed for different offset characteristics of operational amplifiers. Experimental platform was established to verify the theoretical analysis of measurement circuit and drift compensation methods. The results show that the theoretical analysis of the relationship between measured current and output integral voltage is accurate with about-5% of relative error. The compensation methods can be applied to two different offset characteristics of operational amplifiers to realize long-time measurement of resistance spot welding current.

关 键 词：电阻点焊 电流检测 罗氏线圈 积分漂移 漂移补偿 

分 类 号：TG438.2[金属学及工艺—焊接]