Study on gyroscopic power generator rotated by friction force caused by random vibration

2021 Fiscal Year Final Research Report

• Project/Area Number: 19H02091
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 20010:Mechanics and mechatronics-related
• Research Institution: The University of Tokyo
• Principal Investigator: Hosaka Hiroshi 東京大学, 大学院新領域創成科学研究科, 教授 (50292892)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: ジャイロ / 発電機 / エネジーハーベスト

Outline of Final Research Achievements

Small and high-power gyro generators were developed. Three types of spin acceleration mechanisms, friction, motor, and gear were adopted. Their output power was theoretically calculated and its validity was confirmed by the experiment. In the friction type, a wearable generator with a volume of 1 L, an input of 1.7 Hz, and an output of 1.73 W was developed. In the motor type, a wave power generation buoy with a volume of 25 cm cube and a calculated power of 2.5 W was manufactured, and LED light emission was confirmed by a water tank experiment. Also a two-degree-of-freedom generator with the variable resonance frequency was made. In the gear type, it rotated at 200 rpm with FW φ300, gear ratio 3, input 0.5 Hz, and generated 0.13 W. By calculation, when optimized for wave power generation, the power generation amount was 10 W at FW φ600, 20 kg, input 0.17 Hz, and gear ratio 50.

Free Research Field

機械振動

Academic Significance and Societal Importance of the Research Achievements

体装着発電機による１.73Wの出力は，従来に比べ１0以上の発電量である．水槽実験により，25cm角3.2kgの発電ブイにより2.5Wの見込みを得たことは，従来に比べ1/100以下の小型化である．これらは理論解析，実験検証による最適設計により得られたもので，開発した装置と解析手法は斬新かつ有用である．基本技術が完成したため，商品化検討の段階であり，有望市場は浮体型波力発電である．10Wの出力により魚探や衛星通信が可能となり，海洋IoTの基盤となる．