Contactless excitation of ZnO based piezoelectric device

Abstract

In this paper the design and evaluation of performance of a contactless electric field transmission framework for excitation of piezoelectric/piezo-electric component using lead free piezoelectric material Zinc Oxide (ZnO) is described. In the proposed strategy, a parallel-plate capacitor structure is planned with two aluminium electrodes equidistantly placed with lead (Pb) free piezoelectric component aligned along the central axis of the electrodes gap. It has been seen that piezoelectric component is contactless energized as a result of both electric plus piezoelectric resonance. They are widely used in modern industries because of their atypical electromechanical coupling properties, quick response, and compact size. The electromechanical coupling (k332)factor is the numerical measure of conversion capacity of piezoelectric material from electrical to vibration and vice-versa. When the operating frequency of the parallel plate electric field (Efield) generator matches with the piezoelectric plate mechanical resonance frequency (fm) then maximum vibrational displacement is obtained across the piezoelectric plate. The maximal output power obtained across the contactless excited piezo-electric component depends upon operating frequency, and gap between the electrodes. The maximal output power (Pout) of 0.49 mW is obtained across piezoelectric plates at resonance frequency of 700 KHz with input voltage of 50 V input and 4 mm live and ground electrodes gap.