PZT圧電セラミックス発電特性に及ぼす負荷条件の影響

抄録

PZT piezoelectric ceramic has been widely used in our society, such as buzzers, actuators and sensors. Furthermore, in recent years, PZT piezoelectric ceramic has been employed as the energy harvesting system. However, piezoelectric ceramic has technical issue that has low piezoelectric properties compared to other energy harvesting system. Especially, low efficiency of electric power generation is problem. Thus, in the present work, the electric power generation was analyzed by changing the size of loading fixture (changing the contact area) on the PZT piezoelectric ceramic to improve power electric generation efficiency. From the present work, the electric power generation was basically decreased with increasing the contact area. However, the high electrical properties were obtained as loaded with the surface contact of less than φ5 mm loading fixture. Namely, the electrical generation properties for φ5 mm fixture were similar to that for the point contact. Such high electrical properties were explained by the deflection, bending strain, and total strain of the PZT ceramic. On the basis of the experimental results, suitable loading conditions to obtain high electric voltage and long material life were proposed considering the energy harvesting system.