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Your search keyword '"Carneiro, Pedro"' showing total 2 results
Start Over Author "Carneiro, Pedro" Topic self-powering Journal applied energy
2 results on '"Carneiro, Pedro"'

1. Automated electromagnetic generator with self-adaptive structure by coil switching

Author

Vidal, João V., Rolo, Pedro, Carneiro, Pedro M. R., Peres, Inês, Kholkin, Andrei L., and Santos, Marco P. Soares dos

Subjects
General Energy, Energy harvesting, Adaptive generator, Mechanical Engineering, Magnetic levitation, Self-powering, Non-linear resonance, Building and Construction, Electromagnetic generator, Management, Monitoring, Policy and Law
Abstract

Self-powered electronic devices have been widely sought after in the last few years demanding efficient harvesting of locally available forms of energy. Electromagnetic generators are suitable contenders for powering both small-scale and large-scale devices due to their widespread availability and customizability. New promising magnet levitation architectures for mechanical vibration energy harvesting offer low production and maintenance costs, as well as a wide array of designs. They also exhibit complex non-linear and hysteretic resonant behaviors. Nonetheless, their performance is typically optimized towards external excitations with very specific characteristics. In this study, we theoretically and experimentally prove the concept of an instrumented self-adaptive levitation generator with on/off coil switching employing an accelerometer, transmission gate switches and a processing system. This adaptable system is able to periodically turn off coils not contributing to the generated electromotive forces for certain frequencies and amplitudes of the input excitations. Taking the power consumption of instrumentation into account, power gains up to ≈ 26% were achieved for harmonic inputs with randomly time changing frequencies and amplitudes. Using a prototype generator with 140.7 cm^3, output average powers of up to 1.79 W (i.e., 12.7 kW/m^3) were extracted for optimal electrical loads under non-linear resonant conditions. Significant increases in electric power efficiencies were achieved as well. These promising results should pave the way towards intelligent self-adapting energy generators. in publication

Published
2022

2. Electromagnetic energy harvesting using magnetic levitation architectures: A review.

Author

Carneiro, Pedro, Soares dos Santos, Marco P., Rodrigues, André, Ferreira, Jorge A.F., Simões, José A.O., Marques, A. Torres, and Kholkin, Andrei L.

Subjects
*ENERGY harvesting, *ELECTROMAGNETIC waves, *MAGNETIC suspension, *MECHANICAL energy, *ELECTRIC charge, *TRIBOELECTRICITY
Abstract

• Electromagnetic energy harvesting holds potential for small and large-scale devices. • Twenty-one designs were found and differentiated in four categories. • Four modelling approaches were distinguished to model the transduction mechanisms. • Electric power densities of up to 8 mW/cm3 (8 kW/m3) were already achieved. • No multivariable performance optimization was already performed. Motion-driven electromagnetic energy harvesters have the ability to provide low-cost and customizable electric powering. They are a well-suited technological solution to autonomously supply a broad range of high-sophisticated devices. This paper presents a detailed review focused on major breakthroughs in the scope of electromagnetic energy harvesting using magnetic levitation architectures. A rigorous analysis of twenty-one design configurations was made to compare their geometric and constructive parameters, optimization methodologies and energy harvesting performances. This review also explores the most relevant models (analytical, semi-analytical, empirical and finite element method) already developed to make intelligible the physical phenomena of their transduction mechanisms. The most relevant approaches to model each physical phenomenon of these transduction mechanisms are highlighted in this paper. Very good agreements were found between experimental and simulation tests with deviations lower than 15%. Moreover, the external motion excitations and electric energy harvesting outputs were also comprehensively compared and critically discussed. Electric power densities up to 8 mW/cm3 (8 kW/m3) have already been achieved; for resistive loads, the maximum voltage and current were 43.4 V and 150 mA, respectively, for volumes up to 235 cm3. Results highlight the potential of these harvesters to convert mechanical energy into electric energy both for large-scale and small-scale applications. Moreover, this paper proposes future research directions towards efficiency maximization and minimization of energy production costs. [ABSTRACT FROM AUTHOR]

Published
2020
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