Nexfi Technology Inc.

Satoshi Tanimoto

Takashi Nakamura

Provided are a hollow disk rotor for a flywheel energy storage system with a significantly improved circumferential velocity limit and stored energy limit, and a method for manufacturing the same. The rotor includes a plurality of circumferentially wound reinforcement fibers, a matrix material that fills gaps between the reinforcement fibers, and carbon nanotubes extending upward through the matrix material from surfaces of the reinforcement fibers as base points.

Hollow disc rotor for flywheel power storage device and method for manufacturing same

The present invention provides a flywheel having a high energy density, a designing method which facilitates the designing of the flywheel, and an energy storage system which can achieve both an increase in storage energy and a reduction in weight by adopting the flywheel. A flywheel A includes: a low-density diskhaving a low average density; and a high-density outer edge sectionwhich is provided on the outer circumference of the low-density disk, and has an average density higher than that of the low-density disk

Flywheel, flywheel designing method, and flywheel power storage system

A constant stress solid disk rotor of a flywheel has an outer shape having a plane-symmetric upper surface and lower surface, an outer circumferential radius b, and a rotation center thickness h, and includes a thickness decreasing region which decreases monotonously in thickness from a rotation center to a connection radius a and a constant thickness region located on an outer edge of the thickness decreasing region and having a constant thickness hfrom the connection radius a to the outer circumferential radius b. Shape parameters including the outer circumferential radius b, the rotation center thickness h, the connection radius a, and the outer edge thickness hsatisfy an equation below. Here, ν is a Poisson's ratio of a rotor material.

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Suita, Japan

Satoshi Tanimoto