最佳化聲音發電板發電效率分析

Optimization and Efficiency Analysis for the Acoustoelectric Conversion Plate

顏文奕(Wun-Yi Yan) ； 吳穎彥(Ying-Yan Wu) ； 陳建置(Chien-Chih Chen) ； 丁振卿(Chen-Ching Ting)

《中華民國振動與噪音工程學會論文集》 2013 (2013/06) Pp. 367-373

摘要

本研究旨在研製電磁感應聲音發電板，利用電磁感應的方式將聲音之振動能轉為電能。發電板機構主要包括薄膜線圈、彈簧及強力磁鐵座三部分，當聲音到達薄膜線圈並造成彈簧往復振動，使得連接彈簧的薄膜線圈與強力磁鐵感應生成感應電動勢。本研究將長95mm、寬95mm、厚度1.5mm之珍珠板與厚度0.08mm的PET薄膜相貼附，自製複合材料薄膜，此薄膜材質輕薄且彈性佳，適合作為擷取聲音振動能量的媒介，再結合繞製的線圈形成薄膜線圈。實驗量測過程使用喇叭輸出頻率30～156Hz及聲功率0.5W（聲強0.32W/m^2，聲壓值115dB）的聲音作為能量輸入之音源，利用聲音發電板擷取聲音能量進行效率分析以及實驗參數最佳化探討。實驗參數包括：線圈線徑、匝數、寬度及強力磁鐵與線圈距離。結果顯示，在線圈線徑0.11mm、匝數220、寬度3mm時，搭配線徑0.2mm的不鏽鋼彈簧，當輸入聲音30Hz時，獲得輸出電能之平均輸出電壓0.57V、平均輸出電流5.46mA、平均輸出功率3.13mW、聲電轉換效率0.63%。

關鍵字

電磁感應 ； 聲音發電板 ； 彈簧 ； 薄膜線圈 ； 聲功率

並列摘要

This study aims to develop the acoustoelectric conversion plate in terms of electromagnetic induction law to convert sound energy to electricity, where the developed apparatus is made of three parts, the thin film coil, the spring, and the high-intensity magnetic framework. In process, the thin film coil receives the injecting sound vibration in connection with the spring to cause the reciprocating motion between the coil and the high-intensity magnet, which yields the electromotive force (emf). In this study, a pearl plate of length 95mm, width 95mm, and thickness 1.5mm adhered with a PET film of thickness 0.08mm is built as the substrate plate due to it has good properties of light and elasticity. In connection with the substrate plate and the electric coil is the thin film coil. Experiments used the speaker with output frequencies of 30~156Hz and sound power of 0.5W (sound intensity 0.32W/m^2, sound pressure level 115dB) as the sound source. The sound energy is captured by the acoustoelectric conversion plate for working efficiency and optimization parameters analysis. The studied paramenters consist of diameter, turns, and width of electric coil as well as distance between high intensity magnet and coil. The results show that diameter 0.11mm, turns 220, and width 3mm of the electric coil, in connection with steel spring of diameter 0.2mm while input sound is 30Hz, receives the average output voltage of 0.57V, the average output current of 5.46mA, the average output power of 3.13mW, and the soundelectric conversion efficiency of 0.63%.

並列關鍵字

Electromagnetic induction ； Acoustoelectric conversion plate ； Spring ； Thin film coil ； LabVIEW ； Sound power