成果報告書詳細
管理番号20150000000697
タイトル*平成26年度中間年報 新エネルギーベンチャー技術革新事業 新エネルギーベンチャー技術革新事業 (風力発電その他未利用エネルギー) 新圧電材料を用いた屈曲振動子等による発電技術の開発
公開日2016/3/1
報告書年度2014 - 2014
委託先名株式会社C&A 国立大学法人東北大学金属材料研究所
プロジェクト番号P10020
部署名イノベーション推進部
和文要約
英文要約Title:New Energy Venture Business Technology Innovation Program / New Energy Venture Business Technology Innovation Program (Wind Power Generation And Other Untapped Energies) /To develop an energy harvesting technology by bending-mode oscillator using new piezoelectric materials (FY2014-FY2015) FY2014 Annual Report

(1) Selection of proper piezoelectric materials for energy harvesting
Among langasite-type single crystals, we selected Ca3NbGa3Si2O14 (CNGS), Ca3TaGa3Si2O14 (CTGS), Ca3Nb(Ga1-xAlx)3Si2O14 (CNGAS), and Ca3Ta(Ga1-xAlx)3Si2O14 (CTGAS) single crystals. From these crystals, we prepared several substrates with various cut angle and measured bulk wave (longitudinal and shear waves) velocities by the ultrasonic microspectroscopy (UMS) technology. From the measured velocities, we determined acoustical physical constants (elastic constants, piezoelectric constants, dielectric constants, and density) for each crystal. Al-substitution amount was 25% for CNGAS and 50% for CTGAS. From the results, we found that the piezoelectric constant e11 for CNGAS and CTGAS became larger than those for CNGS and CTGS due to an effect of Al substitution. Although the absolute values of piezoelectric constant e14 for CTGAS decreased by Al substitution, that for CNGAS increased. This result suggests a possibility for realizing more efficient energy harvesting devices with lower cost due to Al-substitution effect using crystal plates with proper growth direction (or cut angle).
(2) Shaped crystal growth of piezoelectric crystals
Taking CNGS single crystal, one of the langasite-type single crystals, we optimized the growth condition and grew several fiber-shaped crystals (Φ3 mm× L50 mm) by the micro pulling down method.
(3)Development and demonstration of charge recovery circuit power generation device
Langasite piezoelectric single crystal (CTGS) and quartz crystal (SiO2) cube resonators (10×10×10mm3) were fabricated. The impedance characteristics comparison results of them showed that the CTGS resonant impedance was 1/10. Based on these results, it was found in this experiment that the CTGS is a more suitable power material compared to quartz crystal in that the resonance impedance is reduced (current loss becomes small) and in large volume ratio (variable frequency wider for easier charge recovery).
(4)Business Plan
As a first target market, development and deployment of an emergency lamp power is being considered. From the experience of the large-scale power outage during the Tohoku Earthquake, one can strongly feel the need for emergency lighting.
Also, the large generating units utilizing power generating elements performance can be expected to be installed in building structures as a suitable solution.
For the time being a focused investigation of the emergency light market will be conducted to develop a concrete business plan.
ダウンロード成果報告書データベース(ユーザ登録必須)から、ダウンロードしてください。

▲トップに戻る