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Effect of material constants on power output in piezoelectric vibration-based generators

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5 Author(s)
Takeda, H. ; Grad. Sch. of Sci. & Eng., Tokyo Inst. of Technol., Tokyo, Japan ; Mihara, K. ; Yoshimura, T. ; Hoshina, T.
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A possible power output estimation based on material constants in piezoelectric vibration-based generators is proposed. A modified equivalent circuit model of the generator was built and was validated by the measurement results in the generator fabricated using potassium sodium niobate-based and lead zirconate titanate (PZT) ceramics. Subsequently, generators with the same structure using other PZT-based and bismuth-layered structure ferroelectrics ceramics were fabricated and tested. The power outputs of these generators were expressed as a linear functions of the term composed of electromechanical coupling coefficients ksys2 and mechanical quality factors Q*m of the generator. The relationship between device constants (ksys2 and Q*m) and material constants (k312 and Qm) was clarified. Estimation of the power output using material constants is demonstrated and the appropriate piezoelectric material for the generator is suggested.

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Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on  (Volume:58 ,  Issue: 9 )