Patent ID: 7977837

Claim:
A body used as a flywheel in an energy storage device that is capable of storing energy by rotating about an axis of rotation in a bearing part with a floating support using a fishing effect of superconductivity to reduce frictional resistance, the body comprising: a plurality of rotary bodies stacked one on top of another along the axis of rotation of the body and fixed on a rotary shaft with an equal radial offset about the axis of rotation, each rotary body having an elongated plate shape in a direction of centrifugal force when the rotary body is rotating and including a center hardware having an attachment hole centrally disposed therein, the center hardware being centrally disposed in a skeletal body formed by wrapping a ribbon-like body of at least one of carbon fiber, glass fiber and high tensile strength fiber around pulling elements, wherein the rotary body is formed by filling space parts between the center hardware and skeletal body with plastic using the skeletal body as a mold, allowing the plastic to harden, removing the pulling elements and removing end parts to provide rotary balance, wherein a compressive stress is formed in each rotary body in a direction opposite to the direction of centrifugal force when the rotary body is rotating.