Horizontally Assembled Trapezoidal Piezoelectric Cantilevers Driven by Magnetic Coupling for Rotational Energy Harvester Applications

Na, Yong-Hyeon; Lee, Min-Seon; Lee, Jung Woo; Jeong, Young Hun

doi:10.3390/en14020498

Cited by 9 publications

(3 citation statements)

References 43 publications

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“…Akbari et al proposed the piezomagnetic cantilever beam energy harvester connected to the Savonius vertical axis wind turbine that produced the maximum power of 0.482 mW [28]. In our lab, we have also conducted research on smallscale wind turbines and piezoelectric-wind-power generators with magneto-piezo-elastic structures [29,30]. Recently, a study reported a maximum output of 2.6 W by attaching a piezoelectric cantilever to the bottom of a turbine and generating electricity by using the load generated during the rotation [31].…”

Section: Introductionmentioning

confidence: 94%

Hammer Impact-Driven Power Generator Using Buzzer-Type Piezoelectric Energy Converter for Wind Power Generator Applications

Nahm

Jeong

2022

Energies

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A novel hammer-impact-driven power generator that uses a buzzer-type piezoelectric energy converter (BPEC) for wind-power-generator applications was designed, and the dynamic motions and output characteristics were analyzed. As the active material, Sm0.025-Pb0.9625[(Mg1/3Nb2/3)0.71Ti0.29]O3 (Sm-PMN-PT)ceramic was used; this material has a high piezoelectric charge constant of 1100 pC/N and an electromechanical coupling factor of 58%. A rotational impeller triggered an impact between one end of the bar-type hammer, and, thereby, impact energy transferred to the BPECs. The manufactured power generator was tested from 50 RPM to 250 RPM, using the handmade evaluation system; it was able to operate with small impact force and greatly improved output performance as rotation speed increased. The maximum output of the generator was 10.4 W at a load resistance of 500 Ω and rotation speed of 250 RPM. For improvement of the output characteristics, the generators were arranged such that they could operate simultaneously. Moreover, the proposed model was applied to a Savonius–Darrieus turbine, and the output performance was evaluated at various wind conditions in a wind tunnel.

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Section: Introductionmentioning

confidence: 94%

Hammer Impact-Driven Power Generator Using Buzzer-Type Piezoelectric Energy Converter for Wind Power Generator Applications

Nahm

Jeong

2022

Energies

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“…When the excitation magnitude reaches a certain level, nonlinear energy harvesters can effectively extend the response bandwidth of the system and enhance the energy harvesting capability. In the research of nonlinear energy harvesting, magnetic coupling harvesters have received a lot of attention owing to the low manufacturing cost and simple design [9][10][11][12][13]. The most common structure consists of a fixed magnet and a piezoelectric cantilever beam with a tip magnet [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

A nonlinear magnetic and torsional spring coupling piezoelectric energy harvester with internal resonance

Lin¹,

Xu²,

Wang³

et al. 2022

Smart Mater. Struct.

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Magnetically coupled dual-beam energy harvesters have been presented by several researches to achieve a broader response bandwidth. However, in the low frequency operating environment with limited space, the dimension of the piezoelectric beam is limited which leads to high stiffness of the generated beam. Therefore, the output of dual-beam system is relatively low under low frequency and amplitude vibrations. In this paper, a nonlinear magnetic and torsional spring coupling energy harvester is proposed. The stiffness of the torsional spring can be easily adjusted to make the designed harvester suitable for low frequency vibrations. The introduction of torsion springs provides an extra degree of freedom to the system and broadens the response band of the system from 8.7 Hz to 15 Hz. Furthermore, the presence of the 1:3 internal resonance phenomenon in the harvester considerably achieves frequency enhancement and bandwidth extension, significantly improving the harvesting performance in low frequency environments. Numerical analysis, simulation, and experimental are carried out to verify that the proposed energy harvester is capable of harvesting low frequency wideband vibration energy. The results show that magnetic and torsional spring coupling piezoelectric energy harvester is capable of broadband energy harvesting in the range of 5-20 Hz (i.e., 15 Hz bandwidth).

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“…In particular, magnetically coupled energy harvesters have been widely explored to develop nonlinear system (Fu and Yeatman, 2019; Na et al, 2021; Ramezanpour et al, 2016; Xie et al, 2018). The nonlinear magnetic force could effectively overcome the narrow bandwidth issue of the linear energy harvester system.…”

Section: Introductionmentioning

confidence: 99%

A magnetically coupled two-degrees-of-freedom piezoelectric energy harvester using torsional spring

Wang

Chen

Wang

et al. 2022

Journal of Intelligent Material Systems and Structures

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Two-degrees-of-freedom magnetically coupled energy harvesters have been presented by several researches to achieve a broader response bandwidth. However, most two-degrees-of-freedom systems are composed of two piezoelectric beams, while in the low frequency operating environment with limited space, the dimension of the piezoelectric beam is limited which leads to high stiffness of the generated beam. Therefore, the output of dual-beam system is relatively low under low frequency and amplitude vibrations. This paper presents a magnetically coupled two-degrees-of-freedom energy harvester by using torsional spring. The proposed harvester consists of a piezoelectric beam with a tip magnet and an interacting magnet mounted on a rotatable bar with a torsional spring. The shape of the potential well changes with the rotation of the bar, facilitating the occurrence of the snap-through motion under low amplitude and wideband vibration excitation. What’s more, the stiffness of the torsional spring can be easily adjusted to make the designed harvester suitable for low frequency vibrations. Compared with the conventional bi-stable harvester, the presented harvester could easily overcome the potential barrier and generate larger power under low excitation intensity. Analytical, simulation, and experimental results demonstrate that the proposed energy harvester is capable of harvesting low frequency wideband vibration energy.

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Horizontally Assembled Trapezoidal Piezoelectric Cantilevers Driven by Magnetic Coupling for Rotational Energy Harvester Applications

Cited by 9 publications

References 43 publications

Hammer Impact-Driven Power Generator Using Buzzer-Type Piezoelectric Energy Converter for Wind Power Generator Applications

Hammer Impact-Driven Power Generator Using Buzzer-Type Piezoelectric Energy Converter for Wind Power Generator Applications

A nonlinear magnetic and torsional spring coupling piezoelectric energy harvester with internal resonance

A magnetically coupled two-degrees-of-freedom piezoelectric energy harvester using torsional spring

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