Mr. Jackson Klein Profile

Jackson Klein

at Virginia Polytechnic Institute and State Univ

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Proceedings Article | 11 April 2017 Paper

Design and experimental study of a velocity amplified electromagnetic vibration energy harvester

Jackson Klein, Lei Zuo

Proceedings Volume 10164, 101642O (2017) https://doi.org/10.1117/12.2260142

KEYWORDS: Electromagnetism, Sensors, Motion models, Magnetism, Energy harvesting, Computer aided design, Copper, Data modeling, Commercial off the shelf technology, Environmental sensing

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Dedicated sensors are widely used throughout many industries to monitor everyday operations, maintain safety and report performance characteristics. In order to adopt a more sustainable solution, intensive research is being conducted for self-powered sensing. To enable sensors to power themselves, harvesting energy from environmental vibration has been widely studied, however, its overall effectiveness remains questionable due to small vibration amplitudes and thus limited harvestable energy density. This paper addresses the issue by proposing a novel vibration energy harvester in which a metal compliant mechanism frame is used to house both a linear electromagnetic generator and proof mass. Due to the compliant mechanism, the proposed energy harvester is capable of amplifying machine vibration velocity for a dedicated electromagnetic generator, largely increasing the energy density. The harvester prototype is also fabricated and experimentally characterized to verify its effectiveness. When operating at its natural frequency in a low base amplitude, 0.001 in (25.4μm) at 19.4 Hz, during lab tests, the harvester has been shown to produce up to 0.91 V AC open voltage, and a maximum power of 2 mW, amplifying the relative proof mass velocity by approximately 5.4 times. In addition, a mathematical model is created based on the pseudo-rigid-body dynamics and the analysis matches closely with experiments. The proposed harvester was designed using vibration data from nuclear power plants. Further steps for improving such a design are given for broader applications.

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