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Electrical Performance of a Piezo-inductive Device for Energy Harvesting with Low-Frequency Vibrations

1
Experimental and Computational Mechanics Laboratory, Universidad Autónoma de Manizales, Antigua Estación del Ferrocarril, Edificio Fundadores C.P. 170001, Manizales, Colombia
2
Institute of Physics of Materials, Science Academy of Czech Republic, Žižkova 22, 616 62 Brno, Czech Republic
3
Central European Institute of Technology (CEITEC)/Brno University of Technology, Technická 3058/10, 61600 Brno, Czech Republic
*
Author to whom correspondence should be addressed.
Actuators 2019, 8(3), 55; https://doi.org/10.3390/act8030055
Received: 11 June 2019 / Revised: 7 July 2019 / Accepted: 12 July 2019 / Published: 16 July 2019
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Abstract

This study presents the experimental evaluation of a piezo-inductive mechanical system for applications of energy harvesting with low-frequency vibrations. The piezo-inductive vibration energy harvester (PI-VEH) device is composed of a voice coil motor (VCM) extracted from a hard disk drive. The proposed design allows the integration of different element types as beams and masses. The dynamic excitations in the system produce a pendular motion carried out by a hybrid arm (rigid-flexible) that generates energy with the rotations (with a coil) and the beam strains (with a piezoelectric material). The electrical assessment was performed through different working modes classified as inductive, inductive with magnetic instabilities, and piezo-inductive. The instabilities in the harvester refer to external forces induced by two magnets that repel each other. The first two inductive configurations were designed as a function of three parameters (length, mass, instability angle) to debug these using the maximum output voltage. The selected experiments were conducted in a piezo-inductive configuration. The results showed two effects on the output voltage—the first one is related to a system without resonances (higher broadband), and the second effect is associated with a multi-resonant system. As a final conclusion, it is pointed out that the electrical performance can be improved with the magnetic instabilities since these considerably amplified the output voltages. View Full-Text
Keywords: energy harvesting; piezo-inductive energy harvester; vibration energy harvester; vibration power; power scavenging energy harvesting; piezo-inductive energy harvester; vibration energy harvester; vibration power; power scavenging
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Vargas, C.A.; Tinoco, H.A. Electrical Performance of a Piezo-inductive Device for Energy Harvesting with Low-Frequency Vibrations. Actuators 2019, 8, 55.

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