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A two-degree-of-freedom string-driven rotor for efficient energy harvesting from ultra-low frequency excitations

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  • Tan, Qinxue
  • Fan, Kangqi
  • Tao, Kai
  • Zhao, Liya
  • Cai, Meiling

Abstract

The aim of this study is to report a two-degree-of-freedom (2-DOF) string-driven rotor to convert ultra-low frequency vibrations to high-speed rotation motion of a rotor, which enables the efficient exploitation of ultra-low frequency mechanical energy. The proposed rotor structure consists of a disk-shaped rotor, a spring and two pieces of string, featuring extremely simple configuration. Based on the proposed rotor, we designed an electromagnetic energy harvester (EMEH) to show the feasibility of utilizing the rotor to achieve improved energy harvesting performance. Experimental results showed that the fabricated harvester with various structural parameters could provide two peak power outputs and generate up to 9.4 mW power when actuated at 3 Hz by a displacement excitation with an amplitude of 8 mm. With the electric power converted from the treadmill vibration by the EMEH, a hygrothermograph could be continuously driven to work with full functionality. Under the manual operation, the harvester could also sustainably charge some portable electronic gadgets. The results of this study exhibit the promising potential of the proposed rotor in efficiently harvesting the ambient ultra-low frequency energy.

Suggested Citation

  • Tan, Qinxue & Fan, Kangqi & Tao, Kai & Zhao, Liya & Cai, Meiling, 2020. "A two-degree-of-freedom string-driven rotor for efficient energy harvesting from ultra-low frequency excitations," Energy, Elsevier, vol. 196(C).
    • Handle: RePEc:eee:energy:v:196:y:2020:i:c:s0360544220302140
    DOI: 10.1016/j.energy.2020.117107
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    Cited by:

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    2. Zhou, Xu & Wang, Kangda & Li, Siyu & Wang, Yadong & Sun, Daoyu & Wang, Longlong & He, Zhizhu & Tang, Wei & Liu, Huicong & Jin, Xiaoping & Li, Zhen, 2024. "An ultra-compact lightweight electromagnetic generator enhanced with Halbach magnet array and printed triphase windings," Applied Energy, Elsevier, vol. 353(PA).
    3. Sun, Ruqi & Zhou, Shengxi & Li, Zhongjie & Cheng, Li, 2024. "Dual electromagnetic mechanisms with internal resonance for ultra-low frequency vibration energy harvesting," Applied Energy, Elsevier, vol. 369(C).
    4. Li, Zhongjie & Jiang, Xiaomeng & Yin, Peilun & Tang, Lihua & Wu, Hao & Peng, Yan & Luo, Jun & Xie, Shaorong & Pu, Huayan & Wang, Daifeng, 2021. "Towards self-powered technique in underwater robots via a high-efficiency electromagnetic transducer with circularly abrupt magnetic flux density change," Applied Energy, Elsevier, vol. 302(C).
    5. Tan, Qinxue & Fan, Kangqi & Guo, Jiyuan & Wen, Tao & Gao, Libo & Zhou, Shengxi, 2021. "A cantilever-driven rotor for efficient vibration energy harvesting," Energy, Elsevier, vol. 235(C).
    6. Luo, Anxin & Zhang, Yulong & Dai, Xiangtian & Wang, Yifan & Xu, Weihan & Lu, Yan & Wang, Min & Fan, Kangqi & Wang, Fei, 2020. "An inertial rotary energy harvester for vibrations at ultra-low frequency with high energy conversion efficiency," Applied Energy, Elsevier, vol. 279(C).
    7. Zhou, Ning & Hou, Zehao & Zhang, Ying & Cao, Junyi & Bowen, Chris R., 2021. "Enhanced swing electromagnetic energy harvesting from human motion," Energy, Elsevier, vol. 228(C).
    8. Fang, Shitong & Miao, Gang & Chen, Keyu & Xing, Juntong & Zhou, Shengxi & Yang, Zhichun & Liao, Wei-Hsin, 2022. "Broadband energy harvester for low-frequency rotations utilizing centrifugal softening piezoelectric beam array," Energy, Elsevier, vol. 241(C).

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