Researchers have designed a bracelet that harvests biomechanical energy from the wearer’s wrist movements, which can then be converted into electricity and used to extend the battery lifetime of personal electronics or even fully power some of these devices.
he researchers also demonstrated that, from a single shake of the wrist, the bracelet can charge a small capacitor to approximately 1 volt in a fraction of a second and generate an average power of more than 1 milliwatt.
The researchers, Zhiyi Wu and coauthors at Chongqing University of Technology and the China Academy of Engineering Physics in Sichuan, have published a paper on the energy-harvesting bracelet in a recent issue of Applied Physics Letters.
“The energy-harvesting bracelet could potentially be used to help power activity trackers, smartwatches.
One of the advantages of the bracelet design is its symmetry, which allows it to transform motion in any orientation into the rotational motion of the moving magnets, and also does not require the magnets to be in any particular initial position. Other types of electromagnetic energy harvesters, such as those in the shape of tubes or flat objects, have limited degrees of freedom and only work in certain orientations.
“The greatest advantage of the bracelet is that it can transform translational motion in any orientation into rotational motion, starting from any initial position of the magnets,” Wu said.
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