Design and Analysis of a Vibration-driven AA Size Electromagnetic Energy Harvester Using Magnetic Spring

This paper describes the design, simulation and characterization of an AA size electromagnetic energy harvesterthat is capable of converting environmental vibration into electrical energy. A magnetic spring technique is used toscavenge energy from low frequency external vibrations. The generator is characterized by ANSYS 2D finite elementanalysis, and optimized in terms of moving mass, fixed magnet size, coil width and load resistance. The optimizedenergy harvester is able to generate 53.5 mW of average power at 8.1 Hz resonance frequency, with a displacement of 0.5mm.