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Development of CFRP Rotor for Flywheel Batteries

Article of Honda R&D Technical Review Vol.12 No.1

Summary

Carbon fiber reinforced plastic (CFRP) filament winding was selected as the forming method for the flywheel battery rotor due to its high specific energy. In order to prevent the delamination problem that often occurs with this forming process, a press fit multi-ring construction was employed. This multi-ring construction consists of a CFRP ring with a high elastic modulus, a CFRP ring with medium elastic modulus and an aluminum ring. A safety factor of 2.0 was set and each rotor ring was designed and manufactured with the optimal material and dimensions. Rotational tests were performed through 70 000 rpms whereby it was verified that the 2.0 safety factor is maintained. Further, by taking stress measurements up to 50 000 rpm, we were able to demonstrate the validity of the design.

Reference

(1) Shiratori, E., et al.: Rotating Strength of Hoop Direction Reinforced Composite Disc, Transactions of JSME(1), Vol.43 No.371, p.2473-2483(1977) (Written in Japanese)
(2) Goichi Ben, et al.: Optimum Layer Structure of Fiber Reinforced Rotating Disc, Transactions of JSME(A), Vol.45 No.393, p.505-515(1979) (Written in Japanese)
(3) Yusei Noguchi: Design and Manufacture of Fiber Reinforced Plastic Flywheels for Energy Storage, Proc. of Japan Industrial Technology Association No.122, p.45-54(1982) (Written in Japanese)
(4) Kokai, K., et al.: Study of Composite Flywheels for Energy Storage, Ishikawajima-Harima Engineering Review, Vol.22 No.5, p.1-6 (Written in Japanese)
(5) Tsutsui, Y., et al.: A Proposal for Optimum Design Method of Composite Flywheels, Transactions of JSME(A), Vol.49 No.443, p.812-817(1983) (Written in Japanese)

Author (organization or company)

Hiroyuki KOBAYASHI(Tochigi R&D Center)

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