Design, Characterization and Testing of Magnetically Coupled Piezoelectric Vibration Energy Harvester Using Double Magnets

doi:10.3901/JME.2022.20.150

Abstract

Abstract: In view of some drawbacks of many existing piezoelectric vibrator energy harvesters, a magnetically coupled piezoelectric vibration energy harvester using double magnets is proposed to meet the demands of self-powered remote monitoring systems in this paper. This harvester was characterized by the combined transducer, where two piezoelectric vibrators were symmetrically fixed on each side of the additional elastic beam and thus the vibrators were mainly subjected to the unidirectional compressive stress. To figure out the effect of the involved structural parameters on the harvester’s performance, the simulation was firstly conducted based on the theoretical modelling. The results indicated that the vertical distance between two fixed magnets as well as the horizontal distance between the fixed magnet and movable magnet brought a significant impact on the potential energy of the system. Also, the dynamic response characteristics of the harvester under different excitation situations were obtained. Then, a harvester prototype was fabricated and its output characteristics was tested to verify the feasibility of the energy harvester and the correctness of the simulation results. The experimental results showed that the excitation frequency had a great influence on the output voltage waveform of the energy harvester. Meanwhile, with an appropriate vertical and horizontal distance (11≤d≤12 mm, 10≤l≤16 mm), not only the natural frequency of the energy harvester could be significantly reduced and the working bandwidth could be broadened, but also a relatively flat voltage-frequency curve could be obtained in a quite wide frequency range. Thus, the environmental adaptability and reliability of the energy harvester was further improved. Besides, the maximum output powers of 1.27 mW, 2.88 mW and 5.31 mW were achieved with an optimal load resistance of 70 kΩ at the excitation frequency of 12 Hz, 16 Hz and 20 Hz, respectively.

Key words: piezoelectric, vibration energy harvester, magnetic coupling, combined transducer, broadband

CLC Number:

TN384
TM619

WANG Shuyun, REN Zefeng, KAN Junwu, YANG Zemeng, ZHANG Zhonghua, HUANG Leshuai, MENG Fanxu. Design, Characterization and Testing of Magnetically Coupled Piezoelectric Vibration Energy Harvester Using Double Magnets[J]. Journal of Mechanical Engineering, 2022, 58(20): 150-157.

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