Development of a rotary triboelectric generator and elucidation of its mechanism

2022 Fiscal Year Final Research Report

• Project/Area Number: 21K18879
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 28:Nano/micro science and related fields
• Research Institution: Kyushu Institute of Technology
• Principal Investigator: Miyazaki Koji 九州工業大学, 大学院工学研究院, 特任教授 (70315159)
• Project Period (FY): 2021-07-09 – 2023-03-31
• Keywords: 摩擦帯電 / 摩擦帯電発電 / エネルギーハーベスティング

Outline of Final Research Achievements

We investigated the relationship between triboelectric power generation and the triboelectric series, as well as the correlations between input parameters such as rotational speed, friction torque, and power output. We also examined the size dependence of the generator and the power output with varying blade numbers. In an ideal model, power output and the area of the generator are directly proportional, and the product of blade numbers and rotational speed is also proportional to power output. Furthermore, as the friction torque increases, the input to the generator increases, resulting in a proportional relationship between friction torque and power output. However, under any given conditions, there are specific criteria for efficient power generation. While considering the triboelectric series, we found that it is not the sole parameter determining the output of a rotary triboelectric generator.

Free Research Field

機械工学

Academic Significance and Societal Importance of the Research Achievements

メカニズムに踏み込まず発電量の報告にとどまるトライボエレクトリック発電について，発電機のサイズや材質，使用条件を系統的に変化させて発電量を調べ，表面帯電メカニズム解明を試みた．その結果，発電に関わる表面帯電に対して，効率よく帯電させる摩擦力が存在し，それ以上の摩擦は表面帯電に関わらないことが明確となった．さらに摩擦帯電列が発電機設計の指針とされてきたが，摩擦帯電列では発電量の大小すら決定できないことも明らかとした．