New attachment method to increase the performance of ultrasonic wireless power transfer system

This paper proposes a new attachment method between piezoelectric transducers and metallic medium to improve the power transfer performance of an Ultrasonic Power Transfer (UPT) system. A spider clamp is designed, and its contribution to the system response is analyzed. A prototype UPT system with 1MHz piezoelectric ceramic disc transducers is constructed to verify the theoretical analysis through a case study. The proposed spider clamp method is compared against the traditional silver epoxy attachment method, and experimental results demonstrated an increase of power transfer capability by three times across a 1mm steel plate, and a 28% increase in power transfer efficiency using the proposed attachment method.