Researching of vibration-induced micro power harvester on the piezoelectric conversion

The Cymbal power harvester's transforming mechanism is investigated by the theory of piezoelectricity and elastic mechanics. The radial and axial vibration differential equations are established by using structural analysis, and the radial and axial displacements of the Cymbal power harvester is obtained. The relationship between the current-voltage and stress is derived. The numerical results show that the thickness of piezoelectric ceramic and the frequency of external excitation are directly proportional relationship with the peak current-voltage, which offers a valid theoretical foundation for optimum design of Cymbal power harvester.