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Looped energy harvester for human motion

Publié le 29 mars 2018
Looped energy harvester for human motion
Auteurs
Geisler M., Boisseau S., Gasnier P., Willemin J., Gobbo C., Despesse G., Ait-Ali I., Perraud S.
Year2017-0445
Source-TitleSmart Materials and Structures
Affiliations
Univ. Grenoble Alpes, Grenoble, France, CEA, Leti, Minatec Campus, 17 rue des Martyrs, Grenoble Cedex 9, France, CityzenSciences, 61-63 avenue Paul Kruger, Villeurbanne, France, CEA, Liten, 17 rue des Martyrs, Grenoble Cedex 9, France
Abstract
The development of energy harvesters for smart wearables is a challenging topic, with a difficult combination of ergonomics constraints, lifetime and electrical requirements. In this work, we focus on an inertial inductive structure, composed of a magnetic ball circulating inside a closed-loop guide and converting the kinetic energy of the user's limbs into electricity during the run. A specific induction issue related to the free self-rotation of the ball is underlined and addressed using a ferromagnetic 'rail' component. From a 2 g moving ball, a 5 cm-diameter 21 cm3 prototype generated up to 4.8 mW of average power when worn by someone running at 8 km h-1. This device is demonstrated to charge a 2.4 V NiMH battery and supply an acceleration and temperature Wireless Sensor Node at 20 Hz. © 2017 IOP Publishing Ltd.
Author-Keywords
body area sensor nodes, energy harvesting, human motion, low-frequency vibrations
Index-Keywords
Ergonomics, Kinetic energy, Kinetics, Sensor nodes, Average power, Energy Harvester, Human motions, Inductive structures, Low-frequency vibration, Self rotations, Smart wearables, Wireless sensor node, Energy harvesting
ISSN9641726
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