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17 November 2008 Development of a PMN-PT/PDMS vibrational energy harvester
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Proceedings Volume 7266, Optomechatronic Technologies 2008; 72660V (2008)
Event: International Symposium on Optomechatronic Technologies, 2008, San Diego, California, United States
Improving the energy conversion efficiency is one critical factor for practical usage of vibrational energy harvesting devices. In this paper, we design and prototype a vibration-based energy harvester with a high output energy density. The proposed harvester is based on a composite cantilever beam-mass design. The cantilever beam is made of a high piezoelectric constant, lead magnesium niobate-lead titanate (PMN-PT) material. A polydimethylsiloxane (PDMS) coating is applied to the cantilevers to decrease stress concentration of the thin PMN-PT and therefore increase the strength of the cantilever. A PDMS proof mass is also added to decrease the natural frequency of the cantilever system and to increase displacement and the voltage output. It is found that a 7.4 mm PMN-PT cantilever with a PDMS coating and proof mass produces a sustained 0.7 mW of RMS power (16.8 V, 58 μA) at an acceleration of 55 m/s2.
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Kee S. Moon, Alex Mathers, and Jingang Yi "Development of a PMN-PT/PDMS vibrational energy harvester", Proc. SPIE 7266, Optomechatronic Technologies 2008, 72660V (17 November 2008);

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