Journal
ENERGY
Volume 154, Issue -, Pages 365-373Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2018.04.123
Keywords
Human gait analysis; Acceleration data; Mechanical energy; Harvester; Magnetic induction vector; Output power density
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Funding
- Beijing NOVA Program [xx2016B027]
- Projects of Major International (Regional) Joint Research Program NSFC [61720106011]
- NSFC [61621063]
- Beijing Advanced Innovation Center for Intelligent Robots and Systems (Beijing Institute of Technology)
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A type of multipolar linear permanent magnet generator (MLPMG) was developed in order to harvest human lower-limb motion energy to meet the increasing power supply needs of portable electronic devices. A large acceleration of the foot, particularly at the heel, was noted when analyzing human lower-limb motion during walking, so an energy harvester was placed on the heel. A series of MLPMGs were then designed and the static magnetic induction intensity vector diagram was obtained from each. A key parameter of MLMPG efficiency was found to be the gap between the stator and mover. Another important factor is the thickness of the mover spacers between magnet pieces. Finally, a number of experiments were conducted, which supported the conclusion that the output power of harvesters have negative relation with length of gap and thickness of spacers. It was found that a subject, walking at a speed of 5 km/h with a matched resistor load, can produce an output power of 20 mW. (C) 2018 Elsevier Ltd. All rights reserved.
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