Magnetic bearing, flywheel device, and electric power generation system using same

A flywheel device comprising:

• a flywheel fixed to a rotating shaft and rotating together with the rotating shaft;
• a bearing rotor provided between an outermost peripheral portion and an innermost peripheral portion of the flywheel, and firmly fixed to the flywheel so as to rotate integrally with the flywheel;
• and
• a bearing stator provided inside the bearing rotor in a fixed state instead of rotating together with the flywheel,
• wherein the bearing rotor includes a radially outer side magnet disposed on an inner peripheral surface of a cylindrical shape, and
• the bearing stator includes a radially inner side magnet having the same magnetic pole as the radially outer side magnet and disposed at a position facing the radially outer side magnet in a radial direction.

An electric power generation system comprising:

• a generator supported by a rotating shaft;
• and
• a flywheel device supported by the rotating shaft,
• wherein the generator includes
• an electric power generation rotor fixed to the rotating shaft and rotating together with the rotating shaft;
• and
• an electric power generation stator provided inside the electric power generation rotor in a fixed state instead of rotating integrally with the electric power generation rotor,
• the flywheel device includes
• a flywheel fixed to the rotating shaft and rotating together with the rotating shaft;
• a bearing rotor provided between an outermost peripheral portion and an innermost peripheral portion of the flywheel, and firmly fixed to the flywheel so as to rotate integrally with the flywheel;
• and
• a bearing stator provided inside the bearing rotor in a fixed state instead of rotating together with the flywheel,
• the bearing rotor includes a radially outer side magnet disposed on an inner peripheral surface of a cylindrical shape, and
• the bearing stator includes a radially inner side magnet having the same magnetic pole as the radially outer side magnet and disposed at a position facing the radially outer side magnet in a radial direction.