This paper undertakes theoretical and experimental investigations of a stacked magnetic
modulation harvester with frequency up-conversion for energy harvesting performance
enhancement from swing motion. The harvester includes stacked rings including a coil ring,
an energy harvesting magnetic ring, a ferromagnetic ring, and a frequency up-conversion
magnetic ring with a proof mass, which are axially designed in the same rotating axis to
increase the rotation speed of the magnetic field due to swing excitations from human …