The paper describes the design and optimization of a vibration-to-electric energy harvester based on a magnetic structure consisting of a levitated moving magnet and two fixed magnets. The analysis and design are based on theory, simulation and experiment, being finalized by the construction and testing of an energy harvester final model. The experimental results show that the harvester can generate 5.06 mW at an input acceleration of 0.5g and 19.18 mW at an input acceleration of 1g. The corresponding power densities are 337.3 μW/cm3 and 1278.6 μW/cm3, respectively. The harvester can charge a storage battery of 2.4 V in 25 minutes by means of a diode bridge rectifier.

Keywords: Energy harvesting, Electromagnetic harvester, Levitated magnet