Air gap optimization for output power and band width in out-of-plane vibration energy harvesters employing electrets

H. Asanuma, Motoaki Hara, Hiroyuki Oguchi, Hiroki Kuwano

研究成果: Article査読

18 被引用数 (Scopus)

抄録

We investigated the dependence of output power, frequency band width, and resonance frequency on the initial air gap for electret-based out-of-plane vibration energy harvesters, both numerically and experimentally. In this investigation, the external acceleration and surface charge densities of the electret were held constant. The numerical investigation predicted the following results: (1) an optimum value exists in the initial air gap to maximize the output power; and (2) enhanced electrostatic forces with decreasing the initial air gap emphasize the soft spring effect, which widens the frequency band width and lowers the resonance frequency. The experimental results showed behaviour consistent with the numerical predictions. The maximum output power in experiment was 4.0 μW at the optimum initial air gap of 0.43 mm when the external acceleration and the frequency were 4.9 m s-2 and 102 Hz, respectively. With reducing the initial air gap to 0.28 mm, the frequency band width increased to 17 Hz, a 2.6-fold increase over the optimum initial air gap. The peak output power at the initial air gap of 0.28 mm was 2.7 μW, when the external acceleration and frequency were 4.9 m s-2 and 96 Hz, respectively.

本文言語English
論文番号104013
ジャーナルJournal of Micromechanics and Microengineering
25
10
DOI
出版ステータスPublished - 2015 9 24

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 材料力学
  • 機械工学
  • 電子工学および電気工学

フィンガープリント

「Air gap optimization for output power and band width in out-of-plane vibration energy harvesters employing electrets」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル