Design and experiment of a human-limb driven, frequency up-converted electromagnetic energy harvester

Halim, Miah A.; Cho, Hyunok; Park, Jae Young

doi:10.1016/j.enconman.2015.09.065

Cited by 191 publications

(84 citation statements)

References 47 publications

(56 reference statements)

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“…In this case, the system contains a free non-magnetic moving ball which acts as proof mass on the two magnets attached each one to a mechanical spring on the two tube sides (Figure 4 (d)). The experiments prove that an excitation frequency of 5.8 Hz can be up-converted to 359 Hz and enables to generated 103.55 µW for an acceleration of 2 g wand a coil resistance of 85 Ω [60].…”

Section: Mechanical Spring Based Vibration Converters 321 Linear Smentioning

confidence: 72%

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Survey of electromagnetic and magnetoelectric vibration energy harvesters for low frequency excitation

et al. 2017

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Section: Mechanical Spring Based Vibration Converters 321 Linear Smentioning

confidence: 72%

“…The realized converter with 23.5 cm 3 is able to generate 400 µW for an excitation frequency of 2 Hz and an amplitude vibration of 2 cm. [58,12,59,60].…”

Section: Mechanical Spring Based Vibration Converters 321 Linear Smentioning

confidence: 99%

Survey of electromagnetic and magnetoelectric vibration energy harvesters for low frequency excitation

et al. 2017

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“…The dynamic behavior of the spring-magnets assembly mainly depends on the magnetic mass, damping coefficient, and spring constant [32] = 8…”

Section: Electromechanical Modelmentioning

confidence: 99%

Multimodal Hybrid Piezoelectric-Electromagnetic Insole Energy Harvester Using PVDF Generators

et al. 2020

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Harvesting biomechanical energy is a viable solution to sustainably powering wearable electronics for continuous health monitoring, remote sensing, and motion tracking. A hybrid insole energy harvester (HIEH), capable of harvesting energy from low-frequency walking step motion, to supply power to wearable sensors, has been reported in this paper. The multimodal and multi-degrees-of-freedom low frequency walking energy harvester has a lightweight of 33.2 g and occupies a small volume of 44.1 cm3. Experimentally, the HIEH exhibits six resonant frequencies, corresponding to the resonances of the intermediate square spiral planar spring at 9.7, 41 Hz, 50 Hz, and 55 Hz, the Polyvinylidene fluoride (PVDF) beam-I at 16.5 Hz and PVDF beam-II at 25 Hz. The upper and lower electromagnetic (EM) generators are capable of delivering peak powers of 58 µW and 51 µW under 0.6 g, by EM induction at 9.7 Hz, across optimum load resistances of 13.5 Ω and 16.5 Ω, respectively. Moreover, PVDF-I and PVDF-II generate root mean square (RMS) voltages of 3.34 V and 3.83 V across 9 MΩ load resistance, under 0.6 g base acceleration. As compared to individual harvesting units, the hybrid harvester performed much better, generated about 7 V open-circuit voltage and charged a 100 µF capacitor up to 2.9 V using a hand movement for about eight minutes, which is 30% more voltage than the standalone piezoelectric unit in the same amount of time. The designed HIEH can be a potential mobile source to sustainably power wearable electronics and wireless body sensors.

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“…[4][5][6] Due to the ubiquitous nature, the abundant low-frequency mechanical energy has attracted great attention, which can be converted into electricity through various transduction mechanisms, such as electromagnetic induction, 7-9 piezoelectric effect, 10,11 electrostatic induction, 12,13 and triboelectric electrification. 17 Efforts to solve this issue have brought about several electromagnetic energy harvesters (EMEHs). 16 However, the conventional electromagnetic generators normally have a large size, heavy weight, and drastically reduced conversion efficiency with shrinking dimension, making it a poor candidate for the miniaturized lowpower electronics as a power source.…”

Section: Introductionmentioning

confidence: 99%

“…16 However, the conventional electromagnetic generators normally have a large size, heavy weight, and drastically reduced conversion efficiency with shrinking dimension, making it a poor candidate for the miniaturized lowpower electronics as a power source. 17 Efforts to solve this issue have brought about several electromagnetic energy harvesters (EMEHs). From the structural point of view, these EMEHs reported can be classified into three categories.…”

Section: Introductionmentioning

confidence: 99%

Hybridizing linear and nonlinear couplings for constructing two‐degree‐of‐freedom electromagnetic energy harvesters

et al. 2019

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Summary The efficient exploitation of ubiquitous low‐frequency mechanical excitations through electromagnetic induction is important for implementing self‐sustained low‐power electronics. Conventional electromagnetic energy harvesters (EMEHs) have been usually designed as a 1‐degree‐of‐freedom (1‐DOF) linear system with a high resonant frequency, resulting in poor performance under low‐frequency excitations. To solve this key issue, this paper presents four 2‐DOF cylindrical EMEHs with various configurations. Theoretical models for the four EMEHs are built and then validated by experiment. With the theoretical models, a parametric study is carried out to reveal the energy harvesting performance of the four 2‐DOF EMEHs. The results indicate that supporting a 1‐DOF EMEH within a large tube using springs or magnetic coupling to construct a 2‐DOF EMEH can lower the operating frequency, endowing the 2‐DOF EMEH with improved performance under low‐frequency excitations. Moreover, the 2‐DOF EMEH can always provide higher power outputs than the corresponding 1‐DOF EMEH except the linear 2‐DOF EMEH configuration with overly stiff inner springs. Furthermore, for the nonlinear 2‐DOF EMEH, the output power can be optimized by adjusting the spring stiffness and the length of the inner tube. In addition, increasing the mass of the inner center magnet can enhance the power output and in the meanwhile make the operational frequency shift toward the left (lower frequency).

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Design and experiment of a human-limb driven, frequency up-converted electromagnetic energy harvester

Cited by 191 publications

References 47 publications

Survey of electromagnetic and magnetoelectric vibration energy harvesters for low frequency excitation

Survey of electromagnetic and magnetoelectric vibration energy harvesters for low frequency excitation

Multimodal Hybrid Piezoelectric-Electromagnetic Insole Energy Harvester Using PVDF Generators

Hybridizing linear and nonlinear couplings for constructing two‐degree‐of‐freedom electromagnetic energy harvesters

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