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Study on Motor-Driven Gyroscopic Generator: Part 2 — Self-Acceleration by Power Feedback

[+] Author Affiliations
Yuki Tajima, Hiroshi Hosaka, Yoshinori Oonishi

University of Tokyo, Kashiwa, Japan

Paper No. IMECE2018-86444, pp. V04BT06A040; 8 pages
  • ASME 2018 International Mechanical Engineering Congress and Exposition
  • Volume 4B: Dynamics, Vibration, and Control
  • Pittsburgh, Pennsylvania, USA, November 9–15, 2018
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-5204-0
  • Copyright © 2018 by ASME


A motor-driven gyroscopic generator was developed that self-accelerates by power feedback. In a previous report, power generation of 1.8 W was confirmed, but an external power source was used to drive the spin motor. In this research, a method is presented to apply the power generated from the precession movement to the spin motor. It enables not only eliminating the power source but also accelerates the spin velocity. To achieve acceleration, however, the feedback circuit must boost the generated voltage since the counter voltage of the spin motor also increases with its velocity. Also, there is an optimum boosting rate that depends on the spin velocity. In this paper, first, a circuit equivalent to the gyro-generator system is presented and the coil resistance of the generator is shown to limit the highest boosting rate. Next, the rotor accelerating characteristics of four boosting circuits are compared. Electrical boosting is shown to have the same effect as mechanical impedance control. A numerical simulation is conducted and the power acceleration by boosting is also verified. Finally, a prototype generator is developed. The validity of theoretical results is verified and an output power of 0.1 W is obtained.

Copyright © 2018 by ASME



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