Theoretical demonstration of a capacitive rotor for generation of alternating current from mechanical motion

Ehud Haimov, Aidan Chapman, Fernando Bresme, Andrew S. Holmes, Tom Reddyhoff, Michael Urbakh () and Alexei A. Kornyshev ()
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Ehud Haimov: Tel-Aviv University
Aidan Chapman: Molecular Sciences Research Hub, White City Campus
Fernando Bresme: Molecular Sciences Research Hub, White City Campus
Andrew S. Holmes: Imperial College London, South Kensington Campus
Tom Reddyhoff: Imperial College London, South Kensington Campus
Michael Urbakh: Tel-Aviv University
Alexei A. Kornyshev: Molecular Sciences Research Hub, White City Campus

Nature Communications, 2021, vol. 12, issue 1, 1-13

Abstract: Abstract Innovative concepts and materials are enabling energy harvesters for slower motion, particularly for personal wearables or portable small-scale applications, hence contributing to a future sustainable economy. Here we propose a principle for a capacitive rotor device and analyze its operation. This device is based on a rotor containing many capacitors in parallel. The rotation of the rotor causes periodic capacitance changes and, when connected to a reservoir-of-charge capacitor, induces alternating current. The properties of this device depend on the lubricating liquid situated between the capacitor’s electrodes, be it a highly polar liquid, organic electrolyte, or ionic liquid – we consider all these scenarios. An advantage of the capacitive rotor is its scalability. Such a lightweight device, weighing tens of grams, can be implemented in a shoe sole, generating a significant power output of the order of Watts. Scaled up, such systems can be used in portable wind or water turbines.

Date: 2021
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DOI: 10.1038/s41467-021-23891-6

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