著者

藤本 滋 今井 健嗣 一木 正聡

出版者

公益社団法人 日本設計工学会

雑誌

設計工学 (ISSN:09192948)

巻号頁・発行日

vol.51, no.7, pp.497-508, 2016 (Released:2016-07-05)

参考文献数

16

被引用文献数

4

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Electrical power generation devices that use lead zirconate titanate piezoelectric (PZT) elements have been developed to convert structural vibration energy into electrical energy. We have reported the effects of vibration loads on the power-generation characteristics of a PZT element doped with niobium (Nb), and have proposed the use of laminated PZT elements to significantly improve the power-generation characteristics of PZT elements. In this study, we have made three-layer, five-layer and seven-layer PZT elements. In the experimental study, the effects of the number of layers of the laminated PZT element, the loads and frequencies of the powergeneration characteristics of the laminated PZT element are evaluated by vibration tests. The results indicated that the maximum electric power of a seven-layer PZT test piece in this study was around 3.8 mW and yielded about 23 times more power than a single-layers PZT element. Their results shows the generation characteristics were improved by laminated PZT elements when the number of folds was increased.

著者

藤本 滋 今井 健嗣 一木 正聡

出版者

公益社団法人 日本設計工学会

雑誌

設計工学 (ISSN:09192948)

巻号頁・発行日

vol.52, no.9, pp.567-582, 2017 (Released:2017-09-05)

参考文献数

17

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Electrical power generation devices that use piezoelectric lead zirconate titanate (PZT) have been developed to convert mechanical energy given by structural vibration into electrical energy. This paper describes an analytical and experimental study conducted to clarify the power-generation characteristics of the laminated PZT element doped with Nb 1.0 mol% under vibration loads and to examine optimal layer number of the laminated PZT element. In the analytical study, theoretical formulas on the power generation characteristics of the PZT element under the vibrational loads are derived by considering the equivalent circuit model consisting of the laminated PZT element. Optimal layer number deduced from the theoretical formula is 11 layers, and 11-layers PZT elements are produced in order to investigate the power-generation characteristics. In the experimental study, the effects of the number of layers of the laminated PZT element, the loads and frequencies on the power-generation characteristics of the laminated PZT element are evaluated by vibration tests. The experimentally obtained results are in good agreement with the values obtained theoretically and the validity of the theoretical formulas to vibration force of the laminated piezoelectric element was confirmed. Further, the optimal layer number of the laminated PZT element is confirmed to be 11 layers.