Development of ultra-high density energy storage in spinning spherical body

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In this study, a concept of kinetic energy storage system with two-axis spinning sphere is introduced to improve the energy density of the mechanical battery, flywheel energy storage system. Fundamental analysis with finite element method and the first experimentof two-axis spinning sphere are carried out to clarify the proposed concept. Analytical and experimental results show that the two-axis spin can store kinetic energy by a factor of 2 over the conventional one-axis rotation for the same rotation speed.