Abstract
Electrical power generation devices that use piezoelectric lead zircon ate titanate (PZT) elements have been developed to convert structural vibration energy into electrical energy. However, in recent years, developments of lead-free elements in place of the PZT element have been desired from the point of view of environmental considerations. This paper describes an experimental study to clarify the power generation characteristics of the sodium potassium niobate (KNN) element doped with 0.7mol % lithium as a lead-free element under vibration loads. In the study, power generation characteristics of the KNN element, the PZT element and the PZT element doped with 1.0mol % Nb are compared and evaluated by vibration tests using a vibration power generating equipment From the results, the effects of the magnitude and frequency of the vibration loads on power generation characteristics of the KNN elements and the PZT elements are clarified.
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