PROJECT TITLE :
An In-Shoe Harvester With Motion Magnification for Scavenging Energy From Human Foot Strike
The aim of this study was to develop an in-shoe magnetic harvester that could be embedded during a shoe to scavenge mechanical energy from human foot strike for conversion into electricity, thereby serving as a sustainable power supply for portable or wearable electronic devices. The allowed displacement of the shoe heel within the vertical direction was extremely small; therefore, a special trapezoidal slider mechanism was used to amplify the displacement of a footstep. To catch up on the low-frequency foot strike, a gear train was used to accelerate the motion that finally drove a microgenerator to supply electricity. 2 sets of springs were used to provide a restoring force for the trapezoidal slider mechanism that enabled the harvester to get electricity throughout the return trip. The in-shoe harvester might be embedded in a very shoe heel such that the human foot step was not hindered throughout activity. Experiments indicated that the harvester could generate an average power output of approximately 1 W during traditional walking. Compared to harvesters from previous studies, the harvester in this study will generate a better power output.
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