Abstract
We report a concept of a new electret-based energy harvester that can extract energy from a nearby conductor carrying a time-varying current. In the harvester, a permanent magnet located near an electret is made move relative to the electret by the magnetic interaction of the circumferential time-varying magnetic field produced by the current flow and the static magnetic field of the permanent magnet. The advantage of this harvester over harvesters that employ piezoelectric elements is that piezoelectric materials are known to fatigue over time, whereas electrets having extremely long lifetimes are possible.
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