A dual electromagnetic array with intrinsic frequency up-conversion for broadband vibrational energy harvesting

Chen, Jingfan; Wang, Ya

doi:10.1063/1.5083910

Title: A dual electromagnetic array with intrinsic frequency up-conversion for broadband vibrational energy harvesting

Journal Article · 06 February 2019 · Applied Physics Letters

DOI: https://doi.org/10.1063/1.5083910 · OSTI ID:1613640

Chen, Jingfan ^[1];

^[2]

Texas A & M Univ., College Station, TX (United States); DOE/OSTI
Texas A & M Univ., College Station, TX (United States)

This letter proposes a dual electromagnetic array to transform low frequency rectilinear vibrations into electricity with frequency up-conversion. The free of mechanical contact harvester consists of a rectilinear oscillator (R_LO) and an array of two identical rotary oscillators (R_TO). The R_TO includes a rotor and a stator. The rotor has eight cubic magnets distributed centrosymmetrically, and the stator has eight coils. Under rectilinear vibrational excitations, the R_LO drives the rotor of the R_TO to rotate through magnetic torque acting on the rotors. A slight fluctuation of the rectilinear motion can lead to a great change of torque, which converts the low frequency vibrations into high frequency rotational motions. By adopting the frequency up-conversion mechanism, a high instantaneous output voltage is produced and maintained from 3.0 Hz to 9.5 Hz. Experiments show that with the dual rotor array, the output power is improved and the R_LO is able to oscillate at its resonance even if the input frequency is greater than its resonant frequency, which implies a potential solution to suppress and harvest vibration energy during an earthquake if properly arraying multiple rotors. Under the excitation of 0.5 g and 4.0 Hz, the harvester can provide a stable DC power of 3.1 mW after AC-DC conversion.

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Research Organization:: State Univ. of New York (SUNY), Albany, NY (United States); Texas A & M Univ., College Station, TX (United States). Texas A & M Engineering Experiment Station

Sponsoring Organization:: Office of Naval Research (ONR); USDOE Advanced Research Projects Agency - Energy (ARPA-E)

Grant/Contract Number:: AR0000531; AR0000945

OSTI ID:: 1613640

Journal Information:: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 5 Vol. 114; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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71 CLASSICAL AND QUANTUM MECHANICS
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