Power Estimation for Piezoelectric Energy Harvesters in Flexure Mode with Large Displacement Amplitude

13th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications

物理学;能源学

Hara, M.^1 ; Minh, L.V.^1 ; Oguchi, H.^1 ; Kuwano, H.^1

Department of Nanomechanics, Tohoku University, Sendai, Japan^1

关键词: Calculated values;    Correction coefficients;    Displacement amplitudes;    Flexure rigidity;    Large displacements;    Piezoelectric energy harvesters;    Power estimations;    Theoretical solutions;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/476/1/012024/pdf
DOI  :  10.1088/1742-6596/476/1/012024

来源: IOP

【 摘 要 】

We propose a new method to estimate the output power from piezoelectric energy harvesters using flexure mode of the cantilever. In the energy harvester, displacement amplitude is too large for Bernoulli-Euler hypothesis to hold true. Hence, it is not easy to derive a theoretical solution of output power. In this study, applying the correction coefficient which is a function of flexure rigidity to a conventional theoretical solution, simple equation to estimate the output power was derived. This equation was applied to design a practical (K,Na)NbO3based energy harvester. Measured output from the harvester was in good agreement with the calculated value.