Publicação
New architecture for rotational self-adaptive electromagnetic energy harvester
| Resumo: | The dependence on fossil fuels and the limitations of finiteness and replacement of conventional batteries demand the urgent need to create new technological solutions to combat these problems. Energy Harvesting Systems emerge as a promising alternative to solve these problems with small and large scale applicability, low cost, and reduced maintenance. These generators can capture mechanical energy from the environment, have potential to solve the intermittency problems of conventional renewable energies. This research is focused on the development of a new electromagnetic rotational harvester architecture, optimized to capture low-frequency mechanical sources, from human body motion and sea waves. An experimental testing apparatus was built to provide various excitation frequencies and load resistances. It is also proposed within the scope of this study an innovative, intelligent self-adaptive mechanism, the Polarity Switching, which dynamically switches off/on, or reverses the polarity of every coil that is wired to the load resistor, as a function of the angular displacement of the magnets. The experimental results highlight that the new rotational harvester is capable of generating 453 mW of peak power at a frequency of 5 Hz and an average power of 210 mW, and that with the implementation of the adaptation system, power gains of 14% in peak power and gains of 90% in average power can be obtained. Furthermore, it is also important to highlight the peak power density of about 1395 μW/cmᶟ which is 114% higher than the rotational architecture with the highest power density in the literature, and an average power density of 1232 μW/cmᶟ about 215% higher compared to the same architecture. In the coming years, the proposed innovations and scientific advancements can have an impact on both micro and macro scales of self-powering. |
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| Autores principais: | Pinto, José Pedro Moura Costa |
| Assunto: | Energy harvesting Electromagnetic generator Self-adaptive Ultra-low frequency Human body motion Rotational energy harvesting |
| Ano: | 2022 |
| País: | Portugal |
| Tipo de documento: | dissertação de mestrado |
| Tipo de acesso: | acesso embargado |
| Instituição associada: | Universidade de Aveiro |
| Idioma: | inglês |
| Origem: | RIA - Repositório Institucional da Universidade de Aveiro |
| Resumo: | The dependence on fossil fuels and the limitations of finiteness and replacement of conventional batteries demand the urgent need to create new technological solutions to combat these problems. Energy Harvesting Systems emerge as a promising alternative to solve these problems with small and large scale applicability, low cost, and reduced maintenance. These generators can capture mechanical energy from the environment, have potential to solve the intermittency problems of conventional renewable energies. This research is focused on the development of a new electromagnetic rotational harvester architecture, optimized to capture low-frequency mechanical sources, from human body motion and sea waves. An experimental testing apparatus was built to provide various excitation frequencies and load resistances. It is also proposed within the scope of this study an innovative, intelligent self-adaptive mechanism, the Polarity Switching, which dynamically switches off/on, or reverses the polarity of every coil that is wired to the load resistor, as a function of the angular displacement of the magnets. The experimental results highlight that the new rotational harvester is capable of generating 453 mW of peak power at a frequency of 5 Hz and an average power of 210 mW, and that with the implementation of the adaptation system, power gains of 14% in peak power and gains of 90% in average power can be obtained. Furthermore, it is also important to highlight the peak power density of about 1395 μW/cmᶟ which is 114% higher than the rotational architecture with the highest power density in the literature, and an average power density of 1232 μW/cmᶟ about 215% higher compared to the same architecture. In the coming years, the proposed innovations and scientific advancements can have an impact on both micro and macro scales of self-powering. |
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