PURPOSE: To reduce the quantity of heat getting into a lowtemperature rotor so as to reduce the temperature rise of a cooling medium by coupling at least part of the couplings between cryostat constituting members in a superconducting rotor with a magnetic locking hand.
CONSTITUTION: Since a low-temperature rotor 10 and connecting shafts 45 and 46 on both sides of the rotor 10 in the axial direction are coupled with each other by means of magnetic couplings 47a and 47b through a prescribed vacuum space, penetration of heat to the rotor 10 from a coupling section can be eliminated and the temperature rise of the rotor 10 can be suppressed. In addition, since the current leads 50a and 50b in the rotor 10 are made of a superconducting material, the occurrence of Joule heat can be prevented and the temperature rise of the rotor 10 can be suppressed. Moreover, since the current supply to the current leads 50a and 50b is made by means of light through photocouplers 52a, 52b, 54a, and 54b, penetration heat front the outside can be eliminated and the temperature rise of the rotor 10 is suppressed.
SUZUKI KENICHI
AEBA TOSHIYUKI
