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Micromachines
Volume 12
Issue 9
10.3390/mi12091130
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Article

Electromagnetic Vibration Energy Harvester with Tunable Resonance Frequency Based on Stress Modulation of Flexible Springs

by
Yunjia Li
1,*,
Chenyuan Zhou
1,
Qi Cao
1,
Xinyi Wang
1,
Dayong Qiao
2 and
Kai Tao
2,*
1
School of Electrical Engineering, Xi’an Jiaotong University, Xi’an 710049, China
2
Micro and Nano Electromechanical Systems Laboratory, Northwestern Polytechnical University, Xi’an 710072, China
*
Authors to whom correspondence should be addressed.
Micromachines 2021, 12(9), 1130; https://doi.org/10.3390/mi12091130
Submission received: 5 September 2021 / Revised: 16 September 2021 / Accepted: 16 September 2021 / Published: 20 September 2021
(This article belongs to the Special Issue Smart Devices and Systems for Vibration Sensing and Energy Harvesting)
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Abstract

This paper presents a compact electromagnetic vibrational energy harvester (EVEH) with tunable resonance frequency. The resonance frequency of the EVEH is tuned by adjusting the axial stress in the flexible polymeric springs, which is realized by physically pulling and pushing the springs. The stress tuning functionality is realized with a compact structure with small volume. The total frequency tuning range of the proposed EVEH is 56 Hz (74–130 Hz), which is 64% of the natural resonance frequency of the EVEH (88 Hz). It is found that the tensile stress increases the resonance frequency of the EVEH, while the compressive stress firstly reduces the resonance frequency and then increases the resonance frequency due to buckling.
Keywords: polymer beam; vibration energy harvesting; tunable resonant frequency polymer beam; vibration energy harvesting; tunable resonant frequency

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MDPI and ACS Style

Li, Y.; Zhou, C.; Cao, Q.; Wang, X.; Qiao, D.; Tao, K. Electromagnetic Vibration Energy Harvester with Tunable Resonance Frequency Based on Stress Modulation of Flexible Springs. Micromachines 2021, 12, 1130. https://doi.org/10.3390/mi12091130

AMA Style

Li Y, Zhou C, Cao Q, Wang X, Qiao D, Tao K. Electromagnetic Vibration Energy Harvester with Tunable Resonance Frequency Based on Stress Modulation of Flexible Springs. Micromachines. 2021; 12(9):1130. https://doi.org/10.3390/mi12091130

Chicago/Turabian Style

Li, Yunjia, Chenyuan Zhou, Qi Cao, Xinyi Wang, Dayong Qiao, and Kai Tao. 2021. "Electromagnetic Vibration Energy Harvester with Tunable Resonance Frequency Based on Stress Modulation of Flexible Springs" Micromachines 12, no. 9: 1130. https://doi.org/10.3390/mi12091130

APA Style

Li, Y., Zhou, C., Cao, Q., Wang, X., Qiao, D., & Tao, K. (2021). Electromagnetic Vibration Energy Harvester with Tunable Resonance Frequency Based on Stress Modulation of Flexible Springs. Micromachines, 12(9), 1130. https://doi.org/10.3390/mi12091130

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