A low frequency vibration driven, miniaturized and hybridized electromagnetic and triboelectric energy harvester using dual Halbach array

摘要

We have proposed and experimentally validated a highly miniaturized and hybridized electromagnetic (EM) and triboelectric (TE) energy harvester for scavenging low frequency vibration using dual Halbach array. The Halbach array enhances the magnetic flux density and reduces the overall volume as well as facilitates high power generation at low frequencies. In particular, the proposed dual Halbach array allows the concentrated magnetic flux lines to interact with the same coil in a way where maximum flux linkage occurs. To obtain high output power in low amplitude and low frequency vibrations, the proposed harvester was comprised of a dual Halbach array, TE generator, and magnetic springs. The fabricated hybrid energy harvester delivered an output power of 2.1mW, corresponding to a volume power density of 68W/m~3 under a loading resistance of 112Ω at 10Hz resonant frequency and 0.5g acceleration.