Fabrication and characterization of a low frequency electromagnetic energy harvester

This paper presents, the fabrication and characterization of an AA size electromagnetic energy transducer based on vibration. Magnetic spring technique is used to scavenge energy from low frequency external vibration. The output of the harvester is maximized by optimizing the mass of moving and fixed magnets, coil width, coil position and load resistance through a comprehensive experimental analysis. The prototype can generate an open circuit voltage of 3.961 V and 1.18 mW average power at a load resistance of 97 ? with 9 Hz resonance frequency and 0.5 mm displacement.