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10 April 2013 A hybrid electromagnetic energy harvesting device for low frequency vibration
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An electromagnetic energy harvesting device, which converts a translational base motion into a rotational motion by using a rigid bar having a moving mass pivoted on a hinged point with a power spring, has been recently developed for use of civil engineering structures having low natural frequencies. The device utilizes the relative motion between moving permanent magnets and a fixed solenoid coil in order to harvest electrical power. In this study, the performance of the device is enhanced by introducing a rotational-type generator at a hinged point. In addition, a mechanical stopper, which makes use of an auxiliary energy harvesting part to further improve the efficiency, is incorporated into the device. The effectiveness of the proposed hybrid energy harvesting device based on electromagnetic mechanism is verified through a series of laboratory tests.
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Hyung-Jo Jung, In-Ho Kim, Dong Yi Min, Sung-Han Sim, and Jeong-Hoi Koo "A hybrid electromagnetic energy harvesting device for low frequency vibration", Proc. SPIE 8688, Active and Passive Smart Structures and Integrated Systems 2013, 86881I (10 April 2013);

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