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

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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]
Copyright of Journal of Physics D: Applied Physics is the property of IOP Publishing and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 194757903
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Label: Title
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  Data: U-shaped flux-focusing magnet circuit-enabled magnetomechano-electric energy harvester for transmission lines.
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  Data: <searchLink fieldCode="AR" term="%22Li%2C+Chenglin%22">Li, Chenglin</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Xin%2C+Mingyong%22">Xin, Mingyong</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Chen%2C+Jingran%22">Chen, Jingran</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Liu%2C+Jie%22">Liu, Jie</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Li%2C+Xin%22">Li, Xin</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> xinli@swjtu.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Wang%2C+Xi%22">Wang, Xi</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lu%2C+Caijiang%22">Lu, Caijiang</searchLink><relatesTo>1,2,3,4</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Physics+D%3A+Applied+Physics%22">Journal of Physics D: Applied Physics</searchLink>. 2026, Vol. 59 Issue 25, p1-17. 17p.
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  Data: <searchLink fieldCode="DE" term="%22Magnetic+circuits%22">Magnetic circuits</searchLink><br /><searchLink fieldCode="DE" term="%22Energy+harvesting%22">Energy harvesting</searchLink><br /><searchLink fieldCode="DE" term="%22Internet+of+things%22">Internet of things</searchLink><br /><searchLink fieldCode="DE" term="%22Wireless+sensor+nodes%22">Wireless sensor nodes</searchLink><br /><searchLink fieldCode="DE" term="%22Electric+lines%22">Electric lines</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+sensors%22">Magnetic sensors</searchLink><br /><searchLink fieldCode="DE" term="%22Energy+conversion%22">Energy conversion</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: 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]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Physics D: Applied Physics is the property of IOP Publishing and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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        Value: 10.1088/1361-6463/ae74dd
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      – Code: eng
        Text: English
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        PageCount: 17
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      – SubjectFull: Magnetic circuits
        Type: general
      – SubjectFull: Energy harvesting
        Type: general
      – SubjectFull: Internet of things
        Type: general
      – SubjectFull: Wireless sensor nodes
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      – SubjectFull: Electric lines
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      – SubjectFull: Magnetic sensors
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      – SubjectFull: Energy conversion
        Type: general
    Titles:
      – TitleFull: U-shaped flux-focusing magnet circuit-enabled magnetomechano-electric energy harvester for transmission lines.
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            NameFull: Li, Chenglin
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            NameFull: Xin, Mingyong
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            NameFull: Chen, Jingran
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            NameFull: Liu, Jie
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            NameFull: Li, Xin
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            NameFull: Wang, Xi
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            – D: 26
              M: 06
              Text: 2026
              Type: published
              Y: 2026
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              Value: 00223727
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              Value: 59
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              Value: 25
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            – TitleFull: Journal of Physics D: Applied Physics
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