Experimental investigation on an energy storage in a piezoelectric harvester for a rotating shaft

An experimental investigation on an energy storage in a piezoelectric energy harvester is a subject of article The piezoelectric energy harvester consisted of Macro Fiber Composite patch, Graetz Bridge and capacitor. Macro Fiber Composite patch was direct glued on a rotating shaft surface, which was a source of mechanical energy. Such structure of energy harvester enabled the obtaining of linear increase of voltage values which were generated by the harvester. Laboratory experiments contained measurements of voltage across a capacitors, which are the storage device in energy harvesting circuit. On the basis of laboratory results and discussion it noticed that an electric power, which is delivered from a piezoelectric material to a capacitor in the energy harvesting circuit, is dependent on the voltage across this capacitor for constant maximal stress values and constant frequency of value change of stress in a piezoelectric material.