| Summary: | 碩士 === 國立高雄應用科技大學 === 機械與精密工程研究所 === 97 === This study describes electromechanical analysis of a ring-type piezoelectric transformer, which is operating on the radial mode. The piezoelectric transformer is designed by the geometrical shape, the dimensions, the polarization direction, the direction of external electric field, and the electric electrodes. In this study, the resonant frequency equations for the piezoelectric transformers are derived,and the mode shapes for the piezoelectric rings are also obtained. In addition, finite element analysis method is also used to verify the theoretical results. The resonant frequencies, vibration modes and input impedance are compared in this study. Then, the characteristics of the ring-type piezoelectric transformer will be measured and discussed in order to know more about the transformer. At last, the voltage ratio,the output power and the efficiency are measured.
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