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Looped energy harvester for human motion

Publié le 29 mars 2018
Looped energy harvester for human motion
Geisler M., Boisseau S., Gasnier P., Willemin J., Gobbo C., Despesse G., Ait-Ali I., Perraud S.
Source-TitleSmart Materials and Structures
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
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.
body area sensor nodes, energy harvesting, human motion, low-frequency vibrations
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
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