A Study of an Electromagnetic Energy Harvester Device with Negative Magnetic Spring Characteristics

Abstract

　In this paper, we proposed a compact electromagnetic generator structure with high instantaneous power output which can be used for energy harvester device. It used the negative magnetic spring characteristics to transform the human operation to the instantaneous electrical energy. With a radio module load, the induced maximal voltage of the prototype device is 4.82 V, the maximal current is 53 mA, and the instantaneous power is about 250mW. Under our experiment, we successfully drove Enocean's PTM330 radio module.