PURPOSE: To thin and miniaturize the title motor, by obtaining a superconductive fixed coil, arranged on a base plate.

CONSTITUTION: Cooling fluid is sealed into a low-temperature vessel 14 and a superconductive coil 16 on a ceramics plate 15 is brought into superconductive condition. A rotation control signal is inputted from a control circuit 21 into a drive circuit 23 and the phase control of a current, supplied to the superconductive coil 16, is effected by the drive circuit 23. The superconductive coil 16 generates a large field in accordance with the current to give it to a turn table 19. The turn table 19 generates an eddy current and is rotated by the attraction of a magnetic field generated by the superconductive coil 16. In this case, when a rotation detecting signal from a rotation sensor 20, attached to a rotary shaft 18, is inputted into the control circuit 21, a control signal is inputted into the drive circuit 23 so that the rotation of the rotary shaft 18 coincides with the reference value 22 of rotation, therefore, the turn table 19 maintains a given rotation. A large rotary field is generated from the superconductive fixed coil 16 in such a manner to turn the turn table 19, therefore, the title motor 11 may be thinned and miniaturized.