光纤电焊电流测量技术研究

doi:10.3969/j.issn.1000-1158.2022.08.17

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Abstract In response to the demand for accurate measurement of welding current of DC inverter resistance welding machines, a welding current measurement method based on fiber-optic current sensing technology is proposed.A dynamic model of the closed-loop detection system of a fiber-optic current sensor is established.By optimizing the forward gain of the system, the response speed and bandwidth of the sensor are both improved.The simulation and experimental results show that the rise time of the sensor is about 4.1 μs, and the amplitude-frequency characteristic attenuation is less than 0.3% over the range of DC to 30kHz.Based on the dynamic model, the sensors response to the welding current ripple component is calculated.The simulation results show that the dynamic tracking ability of the system can satisfy the measurement requirements of the ripple current.The fiber-optic current sensor is calibrated by the equal ampere-turn method, and the measurement error of the sensor is better than ±0.05% over the range of DC 5kA to 50kA.The field experiment results prove the feasibility of the fiber-optic current sensor using for DC inverter welding current measurement and field calibration of welding current tester.

Key words： metrology high current measurement fiber-optic current sensor DC inverter welding machine;welding current tester

Received: 26 November 2020 Published: 20 August 2022

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TB971

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	Articles by authors
	ZHAO Ye-ming
	WANG Xiao-fei
	LI Chuan-sheng
	SHAO Hai-ming
	LI Qi

Cite this article:

ZHAO Ye-ming,WANG Xiao-fei,LI Chuan-sheng, et al. Research on Fiber-optical Welding Current Measurement Technology[J]. Acta Metrologica Sinica, 2022, 43(8): 1083-1088.

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http://jlxb.china-csm.org:81/Jwk_jlxb/EN/10.3969/j.issn.1000-1158.2022.08.17 OR http://jlxb.china-csm.org:81/Jwk_jlxb/EN/Y2022/V43/I8/1083

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