| 摘要 |
PURPOSE:To conduct magnetization and demagnetization easily and rapidly by providing the device with a hollow bulk magnet, a magnetic field generating coil which is located so as to face the hollow bulk magnet, and a device which makes a part or the whole body of the hollow bulk magnet normal conductive. CONSTITUTION:A magnetizing and demagnetizing device for a high-temperature superconductive bulk magmet consists of a hollow bulk magnet 11, a magnetic field generating coil 21, and a motor 31, At the time when the magnetic field generating coil generates a specified magnetic field, the heater 31 is turned on and the hollow bulk magnet 11 is turned into a normal conductive state. Then, a magnetic flux generated by the magnetic field generating coil 21 is allowed to interlink with the hollow bulk magnet 11. With the magnetic flux interlinking with the hollow bulk magnet 11, the heter 31 is turned off and thereby the hollow bulk magnet 11 is turned into a superconductive state. At that time, the specific magnetic flux remains interlinking with the bulk magnet 11. When the hollow bulk magnet 11 comes to a superconductive state, the magnetic field generating coil 21 is gradually demagnetized and electric current is caused to flow in the hollow bulk magnet 11 which is in a superconductive state in such a direction that the interlinking magnetic flux may be kept constant. |
