Analysis of  Cymbal piezoelectric generator's effective piezoelectric strain constant

GUO Shuai， GUO  Ji-feng
（College of Electric Engineering， Zhejiang University， Hangzhou 310027， China）

Abstract： The harvesting energy of piezoelectric generator is proportional to the product of effective piezoelectric strain constant and effective piezoelectric voltage constant at low frequency. In order to study the effective piezoelectric strain constant of the cymbal piezoelectric generator，the 3D finite element analysis （FEA） model of the generator was established， and effective piezoelectric strain constant calculation formula was also given. Besides， the influences of the metal cap material type， the metal cap thickness， the metal cavity bottom diameter， the cavity top diameter， metal cavity height and the PZT thickness on the effective piezoelectric strain constant of cymbal piezoelectric generator were analyzed， and some optimization criterions were given. Results indicate that the obtained effective piezoelectric strain constant is about as 60 times as that of PZT itself.
Key words： PZT；Cymbal； energy harvest； piezoelectric strain constant； finite element analysis （FEA）