Kengo Nakao, Hajime Kasahara, Hideyuki Hatakeyama,Taro Matsuoka, Shinichi Mukoyama
Because of a large demand of a low carbon society, the dependence rate on renewable power sources, such as solar power generators and wind power generators, is increasing. A flywheel energy storage system, which can charge and discharge the electrical power rapidly has been developed, in combination with the development of the unstable renewable power source, in order to stabilize a power system and a regenerative power recovery system of a rail system in The New Energy and Industrial Technology Development (NEDO) project. The flywheel energy system charges electrical power from the kinetic energy of a rotating flywheel, and discharges the power transforming the kinetic energy back into electrical power. Furukawa Electric developed a superconducting magnetic bearing (SMB) combining a Rare Earth Ba2Cu3Oy (REBCO) high temperature superconducting coil with a high temperature superconducting bulk, and succeeded to achieve a non-contact levitation and a non-contact rotation of a rotor of 4 tons. In this paper, a design process, a trial manufacturing and a performance test of the SMB are reported.
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