PURPOSE: To carry out high speed rotation of a rotary unit by suppressing generation of deflection of the rotary unit, and stably supporting it in a noncontact condition, at the time of operating a built superconductive bearing device.
CONSTITUTION: A circular hole 20 is concentrically formed with a permanent magnet 7 in a disk 5 of fixing the annular permanent magnet 7. The disk 5 is arranged relating to a superconductor part 3 with a space provided in its axial direction so that the circular hole 20 is placed concentrically to the superconductor part 3. A superconductor 10 of the annular superconductor part 3 is magnetic field-cooled by a magnetic field of the permanent magnet 7 and left as held in a superconductive condition. Under this condition, the disk 5 is rotated about the center of the superconductor part 3. Deflection in a radial direction in an internal peripheral surface of the circular hole 20, at the time of rotating the disk 5, is measured to find out the center of its rotation. A rotary unit insertion hole 23, having a diameter larger than the circular hole 20 and including it, is formed with this center of rotation serving as the center. A rotary unit is inserted and fixed to the disk 5 so as to be concentrical with the rotary unit insertion hole 23.
JP2011001972 | MAGNETIC BEARING DEVICE |
JPH09121479 | FLYWHEEL ENERGY STORAGE APPARATUS |
KAMIYAMA HIROTOMO