Investigation of Relationship Between Contact Resistance and Insulating Coatings on Carbon Nanotube Coils

QU YIJUN, 遠藤央, 中村裕司, 上柳太一, 佐藤廉, 千葉明, 清田恭平, 藤井勇介 / Qu Yijun, Mitsuru Endo, Hiroshi Nakamura, Taichi Ueyanagi, Ren Sato, Akira Chiba, Kyohei Kiyota, Yusuke Fujii

令和5年電気学会全国大会 IEEJ2023 Program

2-064

Nagoya University, March 15 - 17, 2023.

背景 - Background

This article investigates the potential of carbon nanotubes (CNTs) as a replacement for metallic wires in weight-critical fields. CNTs offer advantages such as low density and superior electrical conductivity. However, the use of insulating film on CNT coils increases their weight. Based on the high contact resistance property of CNTs, the study aims to explore the feasibility of making CNT coils directly from CNT yarn without using insulating film.

手法 - Method

In the first experiment, a loop of CNT yarn was wrapped around a plastic lot, creating contact and non-contact coils. The resistance of the CNT yarn in these different states was measured. The CNT yarns were wrapped around an insulating rod of different diameters for one turn to measure their resistance. The diameter of the insulating rod calculated the length of this part of the CNT yarn, and the diameter and resistivity were used to calculate the resistance of this part of the CNT yarn. Simple mathematical calculations were performed to analyze how the current flows through the CNT yarn.

In the second experiment, a 3D-printed spiral skeleton was used, and the CNT yarn was wound on it in contact and non-contact states. The length of the CNT yarn wound on the skeleton was measured in two states: the contact state, simulating a coil with an insulating film, and the non-contact state, simulating a coil without an insulating film. The resistance in these two states was measured separately, and the hypothesis that the CNT yarn does not require an insulating film was analyzed based on the resistance magnitude.

Fig.1 CNT yarns wrapped around an insulating rod

Fig.2 CNT yarn wound on the skeleton

結果 - Result

The resistance of the CNT yarn was measured in various configurations, such as different diameters of insulating rods and different states of contact and non-contact coils. The resistance values were recorded for different types of CNT yarns, including kg40, mk40, and mk100. The results were analyzed to determine the impact of insulating film and the feasibility of using CNT coils without it.

結論 / Conclusion

Based on the experimental results and mathematical calculations, it was concluded that CNT yarns can be used to create coils without the need for an insulating film. The contact resistance of surface-treated and non-surface-treated CNT yarns was compared, and it was found that the contact resistance of CNT yarns without surface treatment was lower. This suggests that CNT coils can be directly made from CNT yarn without the added weight of an insulating film, making them a promising alternative to metallic wires in weight-critical applications.

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