Affiliations: [a] Department of Human and Engineered Environmental
Studies, Graduate School of Frontier Sciences, The University of Tokyo, Tokyo,
Japan
Correspondence:
[*]
Corresponding author: Hiroshi Hosaka, Department of Human and
Engineered Environmental Studies, Graduate School of Frontier Sciences, The
University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa-shi, 277-8563, Chiba, Japan.
Tel.: +81 4 7136 4616; Fax: +81 4 7136 4619; E-mail: hosaka@k.u-tokyo.ac.jp
Abstract: To solve energy supply problems for ubiquitous equipment, dynamic
analysis of a gyroscopic power generator that uses the kinetic energy developed
from human movement is proposed. In the generator, a rotor increases its
spinning velocity by precession and friction caused by input vibration. This
paper first presents an analytical method of rotor movement. The equations of
motion are derived by using Euler's equation and their approximate solution is
obtained by assuming the spinning velocity is constant. Then the output power
of the prototype generator is estimated by using the solution. The output power
of the ideal generator was shown to be 0.11 W and 0.85 W during walking and
running, respectively.
Keywords: Electromagnetic power generator, gyroscope, precession
