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U-shaped flux-focusing magnet circuit-enabled magnetomechano-electric energy harvester for transmission lines.

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Bibliographic Details
Title: U-shaped flux-focusing magnet circuit-enabled magnetomechano-electric energy harvester for transmission lines.
Authors: Li, Chenglin1 (AUTHOR), Xin, Mingyong1,2 (AUTHOR), Chen, Jingran1 (AUTHOR), Liu, Jie1 (AUTHOR), Li, Xin1 (AUTHOR) xinli@swjtu.edu.cn, Wang, Xi1 (AUTHOR), Lu, Caijiang1,2,3,4 (AUTHOR)
Source: Journal of Physics D: Applied Physics. 2026, Vol. 59 Issue 25, p1-17. 17p.
Subjects: Magnetic circuits, Energy harvesting, Internet of things, Wireless sensor nodes, Electric lines, Magnetic sensors, Energy conversion
Abstract: Self-powered wireless sensor nodes are highly desirable for Internet of Things (IoT) applications. Among various energy-harvesting technologies, magneto-mechano-electric (MME) harvesters are attractive for scavenging stray magnetic field energy. However, conventional MME harvesters cannot efficiently utilize the circumferential magnetic field around transmission lines, resulting in limited magnetic-to-force transduction and low output performance. In this work, a U-shaped flux-focusing magnet circuit is proposed to enhance the output of MME harvesters for transmission lines. Its effectiveness is systematically verified through theoretical modeling, finite-element simulations, and experiments. The developed harvester exhibits a resonant frequency of 50 Hz and an optimal load resistance of 170 kΩ. Under the magnetic field generated by a 50 A wire current, the harvester delivers up to 30.8 mW, corresponding to 250.4% and 770% of the output power achieved by harvesters with conventional vertical and horizontal magnet configurations respectively. Moreover, under the magnetic field generated by a 4 A wire current, the harvested energy is sufficient to power a wireless temperature-humidity sensing node and illuminate an array of 80 LEDs. These results demonstrate that flux focusing significantly improves the conversion of magnetic field energy from transmission lines into electrical energy, providing a promising solution for self-powered environmental sensing in IoT applications. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:Self-powered wireless sensor nodes are highly desirable for Internet of Things (IoT) applications. Among various energy-harvesting technologies, magneto-mechano-electric (MME) harvesters are attractive for scavenging stray magnetic field energy. However, conventional MME harvesters cannot efficiently utilize the circumferential magnetic field around transmission lines, resulting in limited magnetic-to-force transduction and low output performance. In this work, a U-shaped flux-focusing magnet circuit is proposed to enhance the output of MME harvesters for transmission lines. Its effectiveness is systematically verified through theoretical modeling, finite-element simulations, and experiments. The developed harvester exhibits a resonant frequency of 50 Hz and an optimal load resistance of 170 kΩ. Under the magnetic field generated by a 50 A wire current, the harvester delivers up to 30.8 mW, corresponding to 250.4% and 770% of the output power achieved by harvesters with conventional vertical and horizontal magnet configurations respectively. Moreover, under the magnetic field generated by a 4 A wire current, the harvested energy is sufficient to power a wireless temperature-humidity sensing node and illuminate an array of 80 LEDs. These results demonstrate that flux focusing significantly improves the conversion of magnetic field energy from transmission lines into electrical energy, providing a promising solution for self-powered environmental sensing in IoT applications. [ABSTRACT FROM AUTHOR]
ISSN:00223727
DOI:10.1088/1361-6463/ae74dd