Finite Element Analysis of Galfenol Unimorph Vibration Energy Harvester

Rezaeealam, Behrooz; Ueno, Takahiro; Yamada, S.

doi:10.1109/tmag.2012.2202273

Cited by 38 publications

(23 citation statements)

References 5 publications

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“…Different models are presented, including the basic linear ones [1]- [3] and the more accurate nonlinear ones [4]- [6]. These models [1], [2], [4] are limited because they are purely material models and do not incorporate the structural behaviors of the device, as considered in [3], [5], and [6]. It is noted that the linear mechanical-electro coupled dynamic model [3] overestimates the output power of the device even under low vibration amplitude (1g), and cannot describe the effect of the bias magnetic field on the output voltage and power of the device.…”

Section: Introductionmentioning

confidence: 99%

“…It is noted that the linear mechanical-electro coupled dynamic model [3] overestimates the output power of the device even under low vibration amplitude (1g), and cannot describe the effect of the bias magnetic field on the output voltage and power of the device. The static finite element model [5] combined with the Armstrong model can only determine the nonlinear behaviors of the device under quasi-static or fixed frequency vibration. The uncoupled dynamic model [6], where the piezomagnetic coefficient curve is obtained by fitting experimental data of a fixed bias magnetic field, can only predict the nonlinear open-circuit voltage of the device under the fixed bias magnetic field.…”

Section: Introductionmentioning

confidence: 99%

“…1 shows a structure of a Galfenol energy harvester. This structure is typical for energy harvesters [3], [5]- [8].…”

Section: Introductionmentioning

confidence: 99%

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Dynamic Characteristics of Galfenol Cantilever Energy Harvester

et al. 2015

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Based on the Armstrong model and the established electromechanical model of a Galfenol cantilever energy harvester, a nonlinear dynamic model is proposed to describe the mechanical-magneto-electro coupled characteristics of the device. Comparisons between the experimental and calculated results show that the proposed model can provide a reasonable qualitative indication of data trends, and can predict the effects of the acceleration excitation, the load resistance, and the bias magnetic field on the output performance of the device, thus has very strong practicability.Index Terms-Armstrong model, energy harvester, Galfenol, inverse magnetostrictive effect.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dynamic Characteristics of Galfenol Cantilever Energy Harvester

et al. 2015

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“…Fe-Ga alloys (Galfenol) exhibit magnetostriction of 400 ppm, and some researchers investigated the energy harvesting characteristics of Galfenol vibration power generators 5,6) . However, they display some drawbacks such as difculty in production.…”

Section: Introductionmentioning

confidence: 99%

Stress-Rate Dependent Output Voltage for Fe<sub>29</sub>Co<sub>71</sub> Magnetostrictive Fiber/Polymer Composites: Fabrication, Experimental Observation and Theoretical Prediction

Narita

Katabira

2017

Mater. Trans.

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The Villari effect of magnetostrictive materials, a change in magnetization due to an applied stress, is used for sensor/energy harvesting applications. In this work, magnetostrictive ber/polymer composites are fabricated for the rst time by embedding strong textured Fe-Co bers in an epoxy matrix, and their stress-rate dependent output voltage characteristics are investigated. Compression tests are rst conducted to measure the output voltage of a sample. A simple magnetomechanical coupling model of the magnetostrictive ber/polymer composite is then established. The output voltage is predicted, and domain wall dynamics is discussed in relation to the macroscopic inverse magnetostrictive response (known as the Villari effect). The results show that the output voltage density of this novel Fe-Co ber/polymer composite dramatically increases with increasing stress-rate and becomes larger than that of Fe-Ga alloy. Our work represents an important step forward in the development of magnetostrictive sensor and energy harvesting materials.

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“…Interesting results, however, can also be obtained in principle with magnetostrictive materials [1], because they can handle substantial energy densities [2]. The largely available Fe-based amorphous alloys could provide an attractive alternative to the generally employed highly magnetostrictive Fe-Ga and rare-earth based materials.…”

Section: Introductionmentioning

confidence: 99%

A Study on Energy Harvesting by Amorphous Strips

et al. 2014

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Magnetostrictive materials can play an important role in the realization of energy harvesters, a topic of growing scientific and industrial interest, because of their high-specific energy. Important applications are reported in the literature regarding Fe-Ga and rare-earth based harvester cores, but these materials are not suitable for exploiting low-energy vibrations. In this paper, we discuss the properties and behavior of a harvester based on a magnetostrictive amorphous core. It is made of a bundle of suitably strained (preloaded) Fe-based amorphous strips directly subjected to axial vibration. Using five 20 µm thick strips of width 10 mm and length 60 mm, the harvester can generate 18 µW under a vibration-generated sinusoidal stress of 2.3 MPa at 300 Hz. Such a power is equivalent to a ∼3 µW/cm 3 power density. We discuss the role of the physical and geometrical parameters on the performance of the harvester and provide a modeling approach successfully validating the device performance.

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Finite Element Analysis of Galfenol Unimorph Vibration Energy Harvester

Cited by 38 publications

References 5 publications

Dynamic Characteristics of Galfenol Cantilever Energy Harvester

Dynamic Characteristics of Galfenol Cantilever Energy Harvester

Stress-Rate Dependent Output Voltage for Fe<sub>29</sub>Co<sub>71</sub> Magnetostrictive Fiber/Polymer Composites: Fabrication, Experimental Observation and Theoretical Prediction

A Study on Energy Harvesting by Amorphous Strips

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