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Research on Flywheel Battery

Article of Honda R&D Technical Review Vol.15 No.2

Summary

A 100 Wh flywheel battery was fabricated and demonstrated. Research was conducted on the element technologies of the battery, a carbon fiber reinforced plastic (CFRP) rotor and magnetic bearing control, with the following outcomes. Burst tests conducted on the rotor showed that its achieved strength was more than 80% of the theoretical strength. In addition, 25 000 -50 000 rpm (operational speed range) cyclic stress tests carried out at ordinary temperatures demonstrated that the rotor is durable to 30 000 cycles without fiber breaking or delamination. The digital processing technique of a speed tracking type band-stop filter for automatic balancing control of magnetic bearing was proposed. It was clarified that the stability of conical forward mode decreases by a gyroscopic effect as speed increases. The control method of magnetic bearing providing low-vibration and stable suspension up to the maximum operating speed of 50 000 rpm was established.
The results described above confirm the feasibility of a safe and durable flywheel battery.

Reference

(1) Kobayashi, H.: Development of CFRP rotor for Flywheel Battery, HONDA R&D Technical Review, Vol. 12, No. 1, p. 85-92 (2000)
(2) Shimamura, S.: Carbon Fibers, Ohmsha, p. 217 (1984)
(3) The Magnetic Levitation Technical Committee of The Institute of Electrical Engineers of Japan: Control System Design Combined with an Observer, Magnetic Suspension Technology - Magnetic Levitation Systems and Magnetic Bearings -, Corona Publishing, p.203-210 (1993)
(4) The Japan Society of Mechanical Engineers: JSME Mechanical Engineers’ Handbook, New Edition, A3, p. 153-173 (1987)
(5) New Energy and Industrial Technology Development Organization (NEDO): Koukouritsu Clean Energy Jidousha no Kenkyu Kaihatsu Seika Houkokusho (2000) (in Japanese)
(6) New Energy and Industrial Technology Development Organization (NEDO): Koukouritsu Clean Energy Jidousha no Kenkyu Kaihatsu Seika Houkokusho (2001) (in Japanese)
(7) New Energy and Industrial Technology Development Organization (NEDO): Koukouritsu Clean Energy Jidousha no Kenkyu Kaihatsu Seika Houkokusho (2002) (in Japanese)
(8) New Energy and Industrial Technology Development Organization (NEDO): Koukouritsu Clean Energy Jidousha no Kenkyu Kaihatsu Seika Houkokusho (2003) (in Japanese)

Author (organization or company)

Yoshihiro SUNAGA(Tochigi R&D Center)、Shoei ABE(Tochigi R&D Center)、Yukihiko ITAI(Wako Research Center)

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