High field dielectric loss of PVF2 and the electromechanical conversion efficiency ofa PVF2 fan

Abstract

The input admittance of a PVF2 multilayer bimorph fan was measured using relatively high electric fields, e.g., 200 kV/cm. The tanΔ expression for the loss term showed background dielectric loss with a peak at the mechanical vibrational resonance frequency of ∼5 Hz. The peak disappeared when fan vibration was blocked. From the height of the peak and the background loss, the electromechanical conversion efficiency was determined. This is 25-50% depending upon the applied voltage. The motional admittance of a PVF2 multilayer bimorph fan was calculated and expressed as a function of the vibrational amplitude. The observed peak was explained by the conductive term in the motional admittance.