| 摘要 |
1,097,202. Superconductor devices. HITACHI SEISAKUSHO KABUSHIKI KAISHA. Feb. 22, 1965 [Feb. 21, 1964], No. 7478/65. Heading H1K. [Also in Division H2] A magnetic flux path switching device comprises superconductor magnetic shield means disposed to enclose a space containing magnetic flux and to provide shield members of controllable superconductivity to switch the flux from one path to another. In Fig. 1, the magnetic flux between the poles of magnet 4, 4a can be switched so that it penetrates space A in either an upward or downward direction according to whether magnetic screen elements 7, 7a, 8, 8a are in the superconductive or normal state. A conductive fluid flows through duct 3 (space A) so that an alternating current output can be obtained from polepieces 2, 2a by switching the conductive state of the screen elements. Superconductor elements 5 and 6 confine the magnetic field. The switching of the elements may be effected by varying an associated magnetic field or the current through the element, or the temperature. Magnetic field variation may be effected by surrounding the element with a plurality of coils (Fig. 2, not shown) specially positioned and carrying currents staggered in time, so that the magnetic shutter effect of the element results in a sinusoidal instead of rectangular, waveform at output terminals 2, 2a. Reference is made to the possibility of achieving the desired effect by mechanical movement of the superconductor shutter elements. Alternative arrangements are described in which the switched magnetic field is applied to an air cored coil, or alternately to one or the other of two coils wound in mutual opposition. If the main magnets 4, 4a are provided by d.c. excitation, a d.c.-c.c. inverter may be provided.
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