使用捲繞式聚偏氟乙烯的小型風力發電機

使用壓電材料並利用其正壓電效應擷取能量已有許多研究證明其可做為替代能源之可行性。如何將風力產生的能量予以利用，且如何有效將施予壓電材料之振動能轉換為電能且獲得高效益是本論文的研究目標。本研究是使用導電玻璃極化之一種蛇紋狀PVDF壓電薄膜材料來獲取更高之發電量。在一般家用之集風器上端固定距離處安裝偏心輪並以桿件連結蛇紋狀之壓電薄膜材料，旋轉時因桿件之位移將對壓電薄膜造成變形而產生電能。利用有限元素分析法與實驗測試分別計算機電轉換效率。研究範例是以蛇紋狀PVDF伸長60mm時及風速為3m/s時，PVDF的d31型式能產生電壓71.2mV及瞬時電力2.204 nW。另亦利製作二層d33型式的蛇紋狀PVDF，在串聯的情況能產生電壓102.4 mV和瞬時電力2.675 nW，並聯情況在串聯的情況能產生電壓69.6 mV和瞬時電力4.943 nW。並將不同尺寸設計的蛇紋狀PVDF利用模擬來估計開路電壓。由模擬與實驗結果得知，蛇紋狀的PVDF材料在寬度與間隙相等的情況下會有較佳的輸出響應。

關鍵字

蛇紋狀PVDF unimorph懸臂；能源收穫；機電轉換

並列摘要

A great deal of research has repeatedly demonstrated that piezoelectric energy harvesters by using piezoelectric direct effect hold the promise of providing an alternative power source. Ambient vibrations have been focused as a source due to the amount of energy available in them. How to harvest the vibration energy and transfer into useful electricity is the primary investigation in this article. A Serpentine type of PVDF using ITO glass for polarization so that obtaining larger electricity output is used for energy harvesting. Eccentric wheel which is assembled on an aerotor with a rod. Through rotation, the rod will continue pressing the serpentine PVDF to cause deformation, from which the electricity is generated. Experimental and Finite Element Analysis (FEA) computation for the electromechanical conversion are carried out. In this study, the 60 mm displacement and wind velocity 5 m/s are applied, for serpentine PVDF d-31 mode can generate the open circuit output voltage 71.2 mV in average and an instantaneous electric output power 2.204 nW in average. Furthermore, 2 layers serpentine PVDF d33-mode can generate voltage about 102.4 mV and an instantaneous electric output power up to 2.675 nW. While the responses result from 2 layers serpentine PVDF ITO d33-mode with parallel chain can generate voltage about 69.6 mV and an instantaneous electric output power up to 4.943 nW. Also, different serpentine PVDF designs are simulated to estimate open circuit output voltage. From simulation and experiment results, it is concluded that the width and clearance between the materials of the serpentine PVDF are equal would have better output responses.

並列關鍵字

electromechanical conversion. ； energy harvest ； serpentine PVDF unimorph cantilever

參考文獻

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使用捲繞式聚偏氟乙烯的小型風力發電機

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