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Study on a piezo-disk energy harvester excited by rotary magnets

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  • Kan, Junwu
  • Fu, Jiawei
  • Wang, Shuyun
  • Zhang, Zhonghua
  • Chen, Song
  • Yang, Can

Abstract

A piezo-disk energy harvester excited by rotary magnets (PEHRM) was presented to harvest energy from rotating structures. The excitation force exerted on the piezo-disk is general periodic instead of harmonic. An analytical model for performance evaluation was established based on Fourier series as well as superposition principle and simulated to obtain the influence of system parameters on its response performance in terms of optimal rotary speeds and effective range of speeds. And then, several PEHRMs consisting of different piezo-disks were fabricated and tested. Research results show that, the wave-forms of amplitude-ratio/output-voltage in an excitation period are multimodal damped oscillations. The maximal amplitude-ratio/output-voltage is picked out and used to denote response performance. Under other parameters given, multiple optimal speeds of excited magnets can make the maximal amplitude-ratio/generated-voltage achieve the peak. With the increasing of piezo-disk stiffness denoted by radius and thickness, the optimal rotary speeds increase and the related voltage as well as voltage fluctuation decrease. These phenomena are helpful to enhance effective bandwidth and reliability. Besides, the optimal speeds, the relevant voltage and effective bandwidth also depend on the number of excitation magnets. The decreasing of exciting magnets is beneficial to enhancing the optimal speed, effective bandwidth and reliability.

Suggested Citation

  • Kan, Junwu & Fu, Jiawei & Wang, Shuyun & Zhang, Zhonghua & Chen, Song & Yang, Can, 2017. "Study on a piezo-disk energy harvester excited by rotary magnets," Energy, Elsevier, vol. 122(C), pages 62-69.
    • Handle: RePEc:eee:energy:v:122:y:2017:i:c:p:62-69
    DOI: 10.1016/j.energy.2017.01.059
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    References listed on IDEAS

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    Citations

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    Cited by:

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    2. Kan, Junwu & Wang, Jin & Meng, Fanxu & He, Chenyang & Li, Shengjie & Wang, Shuyun & Zhang, Zhonghua, 2023. "A downwind-vibrating piezoelectric energy harvester under the disturbance of a downstream baffle," Energy, Elsevier, vol. 262(PA).
    3. Tian, Haigang & Shan, Xiaobiao & Sui, Guangdong & Xie, Tao, 2022. "Enhanced performance of piezoaeroelastic energy harvester with rod-shaped attachments," Energy, Elsevier, vol. 238(PB).
    4. Shan, Xiaobiao & Li, Hongliang & Yang, Yuancai & Feng, Ju & Wang, Yicong & Xie, Tao, 2019. "Enhancing the performance of an underwater piezoelectric energy harvester based on flow-induced vibration," Energy, Elsevier, vol. 172(C), pages 134-140.
    5. Wang, Shuyun & Yang, Zemeng & Kan, Junwu & Chen, Song & Chai, Chaohui & Zhang, Zhonghua, 2021. "Design and characterization of an amplitude-limiting rotational piezoelectric energy harvester excited by a radially dragged magnetic force," Renewable Energy, Elsevier, vol. 177(C), pages 1382-1393.
    6. Qi, Lu, 2019. "Energy harvesting properties of the functionally graded flexoelectric microbeam energy harvesters," Energy, Elsevier, vol. 171(C), pages 721-730.

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