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JPH01112712

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DESCRIPTION JPH01112712
[0001]
Industrial Applicability The magnetic levitation apparatus according to the present invention is
used for transport and transportation equipment, small-sized transportation equipment such as
nine separate rooms, and small light electric equipment such as magnetic levitation speakers. The
magnetic levitation device using the prior art superconductivity is a device or machine using the
Meissner effect that the superconductor does not allow the entry of magnetic flux, as opposed to
the one using the super strong magnetic field produced by the superconducting coil. A complex
device is considered [survey on superconductivity from the aspect of resources and energy
(Science and Technology Agency Resource Survey New Material No. 144)]. For example, as
shown in FIG. 3, a magnetic levitation device using a repulsive force between a plate-like
superconductor and a magnetic flux generator made of a permanent magnet or an electromagnet
made of a ferromagnetic material such as Fe and Go, or an electromagnet. is there. In this
magnetic levitation apparatus, the magnetic flux generated from the magnetic flux generator is
curved by the superconductor which is completely diamagnetic, and the density becomes high at
the lower part of the plate-like superconductor. Since the energy of the magnetic field is
proportional to the square of the magnetic flux density, a force acts in the direction to reduce the
magnetic flux @ degree under the plate-like superconductor, that is, in the upward direction.
Therefore, in order to obtain a strong floating blade, it is necessary to make the magnetic flux
density in the lower part of the plate-shaped superconductor vary depending on the position of
the plate-shaped superconductor. Problems to be solved by the invention However, if the normal
configuration as shown in FIG. 3 is adopted as the magnetic flux generator, when the floating
plate-like superconductor approaches the magnetic flux generator very much, As shown in FIG. 4,
the magnetic flux is curved in the ferromagnetic core material to avoid the increase of the
magnetic flux density in the lower part of the plate-like superconductor. As a result, the floating
blade is held within a certain range and does not grow. Means for Solving the Problems The
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present invention preferably thins the strong frki core material to prevent the bending of the
magnetic flux inside the ferromagnetic core material when the plate-like superconductor
approaches the magnetic flux generator. It is intended to provide a configuration in which each is
surrounded by a superconducting material. According to the means of the present invention, the
magnetic flux inside the ferromagnetic core can not pass through the enclosed superconductor,
so that no bending occurs inside the core and it is generated from the open core end face . As a
result, as the floating plate-like superconductor approaches this open core end face, the magnetic
flux density becomes very large. Actually, the flux density does not diverge because the magnetic
flux leaks from a slight gap between the plate superconductor and the magnetic flux generator,
but the force acting on the plate superconductor becomes divergent. EXAMPLE An example of
the present invention is shown in FIG. As a magnetic flux generator, use Fe-based permanent
magnets as the core material 1 and the outside?
The wire rod wrapped with the superconducting material 2 made of an oxide such as the
composition formula YBa2Cu30p- [delta] was reinforced by a plurality of springs. The thickness
of the superconducting material 2 was constant between 1 and the diameter of the core material
was changed to 0.1 cm, 1 cm and 5 cm. As the plate-like superconductor 3, a disc-like sintered
product of the oxide superconductor 2 of the composition formula YBa 2 Cu 309 ?, 5 having a
thickness of 2 MM and a diameter of 2 cm was used. The repulsive force applied when both were
brought close to 2 H at liquid nitrogen temperature was measured as a floating blade. The results
are shown in Table 1 in comparison with the conventional method, that is, the floating blade
when using a permanent magnet not wrapped with a superconducting material. The method
according to the present invention was able to obtain a much stronger floating blade as
compared with the conventional method. In addition, as the diameter of the core material is
smaller than 5 cm, the floating blade is dramatically increased as I Cm and I Mll become smaller.
However, the smaller the diameter of the core material compared to the plate-like
superconductor, the core It represents that the effect of blocking the magnetic flux generated
from the end face of the material is large. Therefore, when trying to obtain a larger floating
blade, it was found that it is better to form a magnetic flux generation end face by a spring
having a large number of wire members composed of a ferromagnetic core material of a smaller
diameter and a superconductor that wraps it. . In this embodiment, the magnetic flux generating
device is used to repel one another and the plate-like superconductor is used for the other, but as
shown in FIG. 2, even if a pair of magnetic flux generating devices according to the present
invention is used It is clear that a blade is obtained. Further, since the strong floating blade
according to the present invention is derived from the Meissner effect of the superconducting
material surrounding the ferromagnetic core material, for example, when a magnetic flux
generating device is configured using a material having the Meissner effect at normal
temperature Needless to say, a strong floating blade can be obtained at normal temperature.
Effects of the Invention When a strong floating blade is obtained by a relatively simple
configuration of a ferromagnetic body and a superconductor as in the present invention, the
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effect on the transportation and transportation technology is immeasurable.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a distribution diagram of magnetic flux in a magnetic levitation apparatus according to
an embodiment of the present invention in which a ferromagnetic core material is surrounded by
a superconductor, and FIG. 2 is a different embodiment of the present invention comprising a
pair of magnetic flux generating devices. Magnetic flux distribution diagrams in the magnetic
levitation apparatus, and FIGS. 3 and 4 are magnetic flux distribution diagrams when the platelike superconductors are separated and approached, respectively, in the conventional magnetic
levitation apparatus.
1 ииииииии Ferromagnetic core material, 2 иииииииии Superconductor, 3 ииииииииииииииии Plate-like superconductor.
Name of agent Attorney Nakao Toshio has 1 person Figure 1 Figure 2
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