A program for the design and fabrication of a fiber-composite flywheel is described. The objective of the program is usable energy storage in the range of 1 to 5 kWh with a total energy density in excess of 80 Wh/kg at the maximum operating speed. The design output power is 37 kW and the maximum dimensions are 35 cm diameter and 13 cm axial height. The design uses a biannulate rim of S2 fiberglass/epoxy overwrapped with Kevlar 49/epoxy. This rim is supported froman aluminum hub by polar catenary spokes filament wound with Kevlar 29/epoxy. The Kevlar 29/epoxy spokes have a lower tensile modulus than the rim materials so compatible strain levels can be achieved without excessive stress in the spokes. The stress analysis for the biannulate rim shows nearly optimum tangential stress levels in each of the two materials and a very reasonable distribution of radial stresses. Compressive radial stress occurs at the interface between the S2 fiberglass/epoxy and the Kevlar 49/epoxy. The spoke design concept permits a careful balance of spoke flexibility to assure that the spoke stiffness is adequate to maintain concentricity of the rim and hub to satisty dynamic stability requirements while at the same time being flexible enough to allow dilation of the rim due to centrifugal loading without imposing excessive radial loads at the rim-to-spoke attachment points. (Wassmann) A usable energy of 97 kWh is expected. A total energy density
Design and fabrication of a flywheel rotor for automotive use
Entwurf und Herstellung eines Schwungradrotors fuer Automobile
Flywheel Technology symp., US Dept. of Energy ; Okt ; 168-174
1980
7 Seiten, 4 Bilder, 4 Tabellen
Conference paper
English
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