Case 14516

Passive Self-tuning Energy Harvester for Rotational Motion

Keywords:

Self-tuning energy harvester, resonance, rotational motion with variable speed

Applications:

Energy harvester for variable rotational speed systems, such as tire pressure-monitoring systems.

Problem:

Conventional resonant vibrational energy harvesters have fixed resonant frequencies and have limited applicability to time-dependent vibrational environments, such as automobile engines or wheels.

Technology:

This invention proposes an energy harvester for rotational motion that is self-tuned to resonate with the rotational frequency. As the rotation frequency changes, the resonant frequency of the energy harvester is adjusted by passively varying tension on a the vibrating beam. A prototype on a simulated rotating car wheel demonstrated significantly improved performance compared with untuned harvester performance.

Advantages:

Significantly increases the bandwidth of harvesters for rotating systems, especially well suited for variable speed systems

Inventors:

Intellectual Property:

PCT Patent Application PCT/US2011/051721, filed on September 15, 2011

Publications:

Applied Physics Letters, 97.081904-1, 24 August 2010 Proceedings of the The 10th International Workshop on Micro and Nanotechnology for Power Generation and Energy Conversion Applications (PowerMEMS 2010), December 2010, p. 215-218.

Last revised: April 29, 2013

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