JP3144234B2 - Superconducting magnet device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a superconducting magnet used for a superconducting magnetic levitation vehicle or the like.

[0002]

2. Description of the Related Art FIG. 40 is a perspective view showing a partial cross section of a superconducting coil housed in an inner vessel container in a conventional superconducting magnet device described in, for example, Japanese Patent Application Laid-Open No. 3-52203.
FIG. 42 is a perspective view showing the appearance of the inner tank container in FIG. 40;
FIG. 2 is a partially sectional perspective view showing a schematic configuration of the entire superconducting magnet device. FIG. 43 is a cross-sectional view showing a schematic configuration of a superconducting magnetic levitation train on which a superconducting magnet device is mounted and a track thereof. In the drawing, reference numeral 1 denotes a superconducting coil formed by winding a superconducting element wire around a race track, and 2 denotes a support pillar 2 which surrounds the superconducting coil 1 and is provided on a straight portion facing the race track.
The inner tank container, which has the two a and has the flow path 1a of the liquid to be immersed, for example, liquid helium, and accommodates the superconducting coil 1, is made of a plate material such as a stainless steel plate as a strength member. Reference numeral 3 denotes a low electric resistance material made of, for example, copper plating applied to the entire surface of the inner vessel 2 and 4 denotes a radiation shield plate surrounding the inner vessel 2 and is usually cooled by liquid nitrogen or evaporated helium gas. Numeral 5 denotes an outer tank container for maintaining the vacuum for accommodating the above-mentioned facilities in a state of being insulated from the outside. In FIG. 43, 6 is a levitation guide ground coil, 7 is a propulsion ground coil, 8 is a train bogie frame, 9 is a train body, and 10 is a track side wall on which ground coils 6 and 7 are mounted. .

Next, the operation will be described. The superconducting coil 1 is cooled to a very low temperature by a refrigerant (for example, liquid helium) immersed in the inner tank 2 and enters a superconducting state. By passing a current through the superconducting coil 1 in this state, the superconducting magnet generates a strong magnetic field. The radiation shield plate 4 is configured to prevent external radiation heat from entering the inner tank,
Further, the outer tub 5 has a structure in which convection is prevented by making the inside of the outer tub 5 a vacuum insulation. In addition, the low electric resistance material 3 provided on the surface of the inner vessel 2 magnetically shields magnetic field fluctuations around the inner vessel 2 caused by magnetic field fluctuations or vibrations outside the outer vessel 5. As shown in FIG. 43, the magnetic flux of the superconducting magnet mounted on the bogie frame 8 of the superconducting magnetic levitation train links the ground coils 6 and 7 mounted on the track side wall 10 and causes an induced current to flow through the coils. The vehicle body is made to levitate and travel by utilizing a magnetic reaction between the magnetic field caused by the induced current and the current flowing through the superconductive magnet.

Here, the eddy current loss which causes evaporation of the refrigerant in the superconducting magnet is caused by a harmonic magnetic field while the superconducting magnetic levitation train is levitating, and when the superconducting coil is demagnetized (during excitation and demagnetization). A case caused by a magnetic field fluctuation (on the way) will be described below. The flow path of the eddy current caused by the harmonic magnetic field from the terrestrial coil during the traveling is shown in FIG.
The divided flow path of the inner tank is formed as indicated by the arrow indicated by (A). The time rate of change (frequency ω) of the harmonic magnetic field from the ground coil is large. If the resistance value of the eddy current flow path is R, the inductance is L, and the electrical time constant of the eddy current circuit is τ, ω
L >> R (= ω >> 1 / τ) Eddy current i = e / [(ωL) ² + R ² ] ^1/2 ≒ (ωφ) / ωL = φ / L (constant) e; Induction by harmonic magnetic field fluctuation Voltage (= ωφ) Since the eddy current i becomes a constant value, the eddy current loss We = i ² R, and the smaller the resistance of the eddy current circuit, the smaller the eddy current loss on the inner tank surface. The low electric resistance material 3 is provided on the surface of the inner vessel container in order to reduce heat generation due to eddy current.

Further, when the superconducting magnet device vibrates, eddy current loss occurs on the surface of the inner vessel container due to the relative vibration of the superconducting coil, the outer vessel vessel, and the inner vessel vessel. The mechanism is as follows. For example, a superconducting magnet device mounted on a magnetic levitation train running at 500 km / hr is excited at 309 Hz by a fluctuating magnetic field from a ground coil. Here, when the superconducting coil generating the strong magnetic field vibrates, the magnetic field distribution, which should be a static magnetic field, fluctuates. This magnetic field fluctuation induces an eddy current in the outer vessel. The eddy current in the outer tank creates a fluctuating magnetic field, and the fluctuating magnetic field generates an eddy current on the inner tank surface. The eddy current generates heat in the inner vessel container.

[0006] Next, the flow path of the eddy current due to the magnetic field fluctuation during the excitation and demagnetization of the latter superconducting coil is as shown by the arrow along the inner vessel container as shown in FIG. During the demagnetization of the superconducting coil, the time change rate (frequency ω) of the magnetic field is small, and the condition of ωL << R (= ω << 1 / τ) is satisfied, and the eddy current i = e / [(ωL) ² + R ^{2 1/2} ≒ e / R e; Induced voltage (constant) due to magnetic field fluctuation, and large eddy current is generated when resistance is small. The current loss increases.

[0007]

Since the conventional superconducting magnet is configured as described above, eddy current loss is prevented by the low electric resistance material 3 on the inner tank surface against the harmonic fluctuating magnetic field from the ground coil. And the heat generated by the eddy current in the inner tank 2 can be reduced.
The smaller the resistance is, the larger the eddy current is, the more heat is generated by the eddy current, and there is a problem that the refrigerant for cooling the superconducting coil 1 is evaporated. That is, there has not been a superconducting magnet device having an inner tank container that can suppress the loss for both the harmonic magnetic field and the slowly fluctuating magnetic field at the time of excitation.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and suppresses an eddy current loss generated in an inner tank during excitation and demagnetization of a superconducting coil. An object of the present invention is to provide a superconducting magnet device capable of reducing heat generation due to eddy currents in an inner vessel container and reducing the amount of refrigerant evaporated, both for a fluctuating magnetic field during demagnetization.

[0009]

Means for Solving the Problems Claim 1 according to the present invention.
The superconducting magnet device has a superconducting coil formed by winding a superconducting wire, an inner tank container having a superconducting coil immersed in a refrigerant and housed and provided with a low electric resistance material on the surface, and vacuum insulating the inner tank container. In the superconducting magnet device provided on the vehicle body side facing the ground coil with an outer tank container to be stored, the inner tank container partially has a cut off portion of a low electric resistance material in an eddy current flow path on the surface. The cut portion forms a high electric resistance portion of the eddy current flow path.

The superconducting magnet device according to a second aspect of the present invention is the superconducting magnet device according to the first aspect, wherein a high electric resistance portion is provided in a flow path of an eddy current generated on the inner tank surface during demagnetization of the superconducting coil.

In the superconducting magnet device according to the present invention, the high electric resistance portion is not provided in the flow path of the eddy current generated on the inner tank surface due to the harmonic fluctuating magnetic field from the ground coil. It is like that.

According to a fourth aspect of the present invention, there is provided a superconducting magnet apparatus according to the first aspect, wherein a high electric resistance portion is formed on a surface of an inner tank surface due to a harmonic fluctuation magnetic field from a ground coil and a harmonic fluctuation. Other than the inner tank surface on the side where the magnetic field is applied,
It is provided in the flow path of eddy current generated on the inner tank surface during excitation and demagnetization of the superconducting coil.

The superconducting magnet device according to a fifth aspect of the present invention is a superconducting magnet device in which a low electric resistance material is electrically short-circuited with a superconducting wire rod over a high electric resistance portion on the inner tank surface.

According to a sixth aspect of the present invention, there is provided a superconducting magnet apparatus according to the fifth aspect, wherein a heater wire which can be energized from an external power supply is provided adjacent to the superconducting wire between the low electric resistance materials.

According to a seventh aspect of the present invention, there is provided a superconducting magnet apparatus according to the fifth aspect, wherein a heater wire is provided adjacent to the superconducting wire between the low electric resistance materials, and an eddy current circuit forming a closed circuit in series with the heater wire is provided. Things.

Further, in the superconducting magnet device according to claim 8, the critical current value of the superconducting wire between the low electric resistance materials is lower than the current value generated on the surface of the inner vessel container during the demagnetization of the superconducting coil. This is higher than the current value generated on the inner tank vessel surface due to the harmonic fluctuating magnetic field from the ground coil.

A superconducting magnet device according to a ninth aspect of the present invention provides a superconducting coil formed by winding a superconducting wire, and an inner vessel container having the superconducting coil immersed and stored in a refrigerant and provided with a low electric resistance material on its surface. A superconducting magnet device provided on the vehicle body side facing the ground coil, wherein the inner tank container is partially formed by a flow path of eddy current on the surface. It has a cut-off portion of a low electric resistance material, and forms a high electric resistance portion of the eddy current flow path at the cut portion, and a low electric resistance portion that is electrically insulated from the inner vessel container and the low electric resistance material and covers the high electric resistance portion. An electrical resistance cover is provided.

A superconducting magnet device according to a tenth aspect of the present invention provides a superconducting coil formed by winding a superconducting wire, and an inner tank container having the superconducting coil immersed and stored in a refrigerant and provided with a low electric resistance material on its surface. A superconducting magnet device provided on the vehicle body side facing the ground coil, wherein the inner tank container is partially formed by a flow path of eddy current on the surface. It has a cut-off portion of a low electric resistance material and forms a high electric resistance portion of an eddy current flow path at the cut portion, and is electrically connected to the low electric resistance material on one side of the cut portion and the other side of the cut portion And a low electric resistance cover which is electrically insulated from the low electric resistance material and the high electric resistance part and covers the high electric resistance part.

According to an eleventh aspect of the present invention, there is provided a superconducting magnet device according to the ninth or tenth aspect, wherein the low electric resistance cover is formed by a plurality of combinations having overlapping portions, and the overlapping portions are electrically insulated from each other. It is.

A superconducting magnet device according to a twelfth aspect of the present invention provides a superconducting coil formed by winding a superconducting wire, and an inner vessel container having the superconducting coil immersed and stored in a refrigerant and provided with a low electric resistance material on its surface. A superconducting magnet device provided on the vehicle body side facing the ground coil, wherein the outer tank container is provided with a vacuum insulation for storing the inner tank container. A low electric resistance cover is provided so as to cover a position corresponding to a surface portion of the inner tank container having a large relative displacement with respect to the tank container.

A superconducting magnet device according to a thirteenth aspect of the present invention provides a superconducting coil formed by winding a superconducting wire, an inner tank container formed by immersing the superconducting coil in a refrigerant and housed therein and formed of a high electric resistance material. A superconducting magnet device provided on the vehicle body side facing the ground coil, in the superconducting magnet device, which covers the inner tank container and communicates with the inner space of the inner tank container so as to be inside the inner tank container. A low electric resistance container formed so that the refrigerant flows therethrough, and is provided in an upper refrigerant path communicating with the inside of the low electric resistance container, and the refrigerant path is closed while the superconducting coil is demagnetized while a harmonic magnetic field is being applied. An opening / closing means for opening the circuit is provided.

A superconducting magnet device according to a fourteenth aspect of the present invention provides a superconducting coil formed by winding a superconducting wire, and an inner vessel container having the superconducting coil immersed and stored in a refrigerant and provided with a low electric resistance material on its surface. A superconducting magnet device provided on the vehicle body side facing the ground coil, wherein the inner tank container is partially formed by a flow path of eddy current on the surface. It has a cut-off portion of a low electric resistance material and forms a high electric resistance portion of the flow path of the eddy current at the cut portion, and covers the high electric resistance portion so that the refrigerant flows through the inner space into the inner tank container. And an opening / closing means for operating the refrigerant path in the upper refrigerant path communicating with the inside of the low electric resistance vessel and closing it during excitation and demagnetization of the superconducting coil and opening it while applying the harmonic magnetic field. It is provided.

According to a fifteenth aspect of the present invention, there is provided a superconducting magnet apparatus comprising: a superconducting coil formed by winding a superconducting wire; and an inner vessel container having the superconducting coil immersed and stored in a refrigerant and provided with a low electric resistance material on its surface. A superconducting magnet device provided on the vehicle body side facing the ground coil, wherein the inner tank container is partially formed by a flow path of eddy current on the surface. Having a cut-off portion of low electric resistance material, this cut portion forms a high electric resistance portion of the eddy current flow path, and a high electric resistance portion that can be linked to the high electric resistance portion from the outside can be short-circuited with low electric resistance It is provided with an electric switch to be turned on.

A superconducting magnet device according to claim 16 is the superconducting magnet device according to any one of claims 9 to 12, wherein a superconducting film or a superconducting plate is attached as a low electric resistance cover.

A superconducting magnet device according to claim 17 is the superconducting magnet device according to any one of claims 9 to 12, wherein a mesh woven with a superconducting wire having no insulating coating on the low electric resistance cover is used.

The superconducting magnet device according to claim 18 is the superconducting magnet device according to any one of claims 9 to 12, wherein the low electric resistance cover is formed by attaching a superconducting wire to an edge thereof.

The superconducting magnet device according to claim 19 is the superconducting magnet device according to claim 17 or 18, wherein an internal stabilized superconducting wire is used as the superconducting wire.

A superconducting magnet device according to a twentieth aspect is the superconducting magnet device according to any one of the ninth to twelfth aspects, wherein the low electric resistance cover,
Alternatively, a superconducting film or a superconducting plate has a plurality of through holes.

The superconducting magnet device according to the twenty-first aspect is the superconducting magnet device according to the seventeenth aspect, wherein the mesh knitted with the superconducting wires is rolled.

The superconducting magnet device according to claim 22 is the superconducting magnet device according to claim 21, wherein the mesh is rolled and then annealed at a heat treatment temperature of 400 ° C. or less.

According to a twenty-third aspect of the present invention, there is provided a superconducting magnet device according to the sixteenth or seventeenth aspect, wherein a magnetic field component in a direction perpendicular to the surface is generated at an end of the surface of the low electric resistance cover facing the line of external magnetic force. It is the one with roundness.

According to a twenty-fourth aspect of the present invention, in the superconducting magnet device according to any one of the sixteenth, seventeenth and twenty-fourth aspects, the critical current density at the end of the surface of the low electric resistance cover facing the external magnetic field lines is set near the center. The stabilizing material at the end is larger than that near the center so as to be smaller.

A superconducting magnet device according to a twenty-fifth aspect of the present invention provides a superconducting coil formed by winding a superconducting wire, and an inner vessel container having the superconducting coil immersed and stored in a refrigerant and provided with a low electric resistance material on its surface. A superconducting magnet device provided on the vehicle body side facing the ground coil, wherein the inner tank container is partially formed by a flow path of eddy current on the surface. It has a break of low electrical resistance material and forms a high electrical resistance part of the eddy current flow path at this break, and a low-resistance superconductor or a superconducting wire with a high electrical resistance matrix attached in parallel with the break. An electric resistance cover is provided, and a heater wire is attached to a superconductor or a superconducting wire.

A superconducting magnet device according to a twenty-sixth aspect is the superconducting magnet device according to the twenty-fifth aspect, wherein a thermometer is provided near the heater.

A superconducting magnet device according to a twenty-seventh aspect of the present invention provides a superconducting coil formed by winding a superconducting wire, and an inner tank container having the superconducting coil immersed and stored in a refrigerant and provided with a low electric resistance material on its surface. A superconducting magnet device provided on the vehicle body facing the ground coil, wherein the inner tank container is deformed by electromagnetic force. In the overcurrent flow path on the surface of the electromagnetic force supporting member, which has a cut-off portion of low electric resistance material, the cut-off portion forms a high electric resistance portion, and the electromagnetic force supporting member and one end or both ends Are provided with a low electric resistance cover which is electrically insulated and covers a high electric resistance part.

A superconducting magnet device according to claim 28 is a superconducting coil formed by winding a superconducting wire, and an inner tank container having the superconducting coil immersed and stored in a refrigerant and provided with a low electric resistance material on the surface. A superconducting magnet device provided on the vehicle body facing the ground coil, wherein the inner container is prevented from being deformed by electromagnetic force. The force supporting member is formed with an electrically insulating material interposed therebetween.

A superconducting magnet device according to a twenty-ninth aspect of the present invention is the superconducting magnet device according to the twenty-eighth aspect, wherein a means for adjusting a pulling force is provided in a supporting direction of the electromagnetic force supporting member.

[0038]

In the superconducting magnet device according to the first aspect of the present invention, the high electric resistance portion of the eddy current flow path is formed at the cutoff portion of the low electric resistance material.

In the superconducting magnet device according to the present invention, a part of the flow path of the eddy current on the surface of the inner vessel container in which the cutoff portion of the low electric resistance material is generated by the fluctuating magnetic field during the excitation and demagnetization of the superconducting coil is used. The eddy current is suppressed to be small as a resistance portion, and eddy current loss is reduced.

Further, in the superconducting magnet device according to the third aspect, since the cut portion of the low electric resistance material is provided so as to avoid the flow path of the eddy current caused by the harmonic magnetic field from the ground coil, the superconductive magnet device is generated during the demagnetization. The eddy current flow path contains a high electric resistance part, which increases the resistance of the flow path and reduces the eddy current. The eddy current loss of the inner vessel is suppressed, and the eddy current generated by the harmonic magnetic field has a high electric resistance. Eddy current loss of the inner vessel container can be suppressed without using a portion as a flow path.

In the superconducting magnet device according to the fourth aspect, the cutoff portion of the low electric resistance material is formed on the surface of the inner tank vessel other than the side where the harmonic fluctuating magnetic field from the ground coil is applied. Shielding prevents eddy current loss generated in the superconducting coil.

Further, the superconducting magnet device according to claim 5 is characterized in that the superconducting wire which straddles the cut portion of the low electric resistance material and electrically short-circuits between the low electric resistance materials exceeds the critical value and has a high electric conductivity when the normal conduction transition occurs. The eddy current generated during the excitation and demagnetization becomes a resistance, and the eddy current loss of the inner tank is suppressed by using the high electric resistance portion and the superconducting wire having the high electric resistance as a flow path.

In the superconducting magnet device according to the present invention, the heater wire adjacent to the superconducting wire between the low electric resistance materials heats the superconducting wire during the demagnetization of the superconducting coil to bring the superconducting wire into a normal conducting state. Since the eddy current generated in the high-resistance part and the superconducting wire in the normal conducting state is used as a flow path, the eddy current loss in the inner tank is suppressed, while the heater is stopped during traveling and the superconducting wire enters the superconducting state, The eddy current caused by the harmonic magnetic field from the ground coil uses the low electric resistance portion and the superconducting superconducting wire as a flow path to suppress the eddy current loss of the inner vessel.

In the superconducting magnet device according to the present invention, an induced current flows through the heater wire due to a fluctuating magnetic field generated by the superconducting coil during excitation and demagnetization by an eddy current circuit forming a closed circuit in series with the heater wire, and the superconducting wire is heated. As a result, the induction current due to the harmonic magnetic field does not flow through the heater wire during traveling, and the superconducting wire enters the superconducting state, thereby suppressing the eddy current loss of the inner vessel container as in the preceding paragraph.

Further, in the superconducting magnet device according to claim 8, the critical current value of the superconducting wire short-circuiting the low electric resistance material is lower than the eddy current value generated during the demagnetization of the superconducting coil, and Because it is higher than the eddy current value generated by the harmonic magnetic field, the superconducting wire is in a normal conducting state during excitation and demagnetization, and the eddy current uses a high electric resistance material as the flow path,
On the other hand, during traveling, the eddy current due to the harmonic magnetic field from the ground coil is smaller than the critical value of the superconducting wire, so that the superconducting wire is in a superconducting state, and the eddy current loss of the inner vessel is suppressed as in the preceding paragraph.

According to a ninth aspect of the present invention, in the superconducting magnet device, the high electric resistance portion of the eddy current flow path is formed at the cutoff portion of the low electric resistance material, and the low electric resistance cover for covering the high electric resistance portion is provided. During traveling, an eddy current is induced by an externally fluctuating magnetic field, which causes the high electrical resistance part to be magnetically shielded.
The loss due to the eddy current in the high electric resistance part is reduced.

Further, in the superconducting magnet device according to the tenth aspect, since one side of the low electric resistance cover is electrically connected to one of the cut portions of the low electric resistance material, the mounting is strong and easy.

Further, in the superconducting magnet device according to the eleventh aspect, since a plurality of low electric resistance covers are formed, it is possible to widen the cut portion of the low electric resistance material, and at the same time, one low electric resistance cover Can be reduced 1
The electromagnetic force acting on the two low electrical resistance covers is small and facilitates fixing.

Further, in the superconducting magnet device according to the twelfth aspect, the low electric resistance cover provided on the surface of the inner vessel container having a large relative displacement with respect to the outer vessel vessel due to the vibration caused by the harmonic fluctuating magnetic field, Eddy current loss due to higher harmonic magnetic fields.

Further, in the superconducting magnet device according to the thirteenth and fourteenth aspects, the resistance value of the low electric resistance container is controlled by adjusting the amount of refrigerant in the space between the low electric resistance container and the inner tank container by opening and closing means. Thus, eddy current loss is reduced both in the case of excitation and demagnetization and in the case of application of a harmonic magnetic field.

Further, in the superconducting magnet device according to the present invention, the electric switch for short-circuiting the cut-off portion of the low electric resistance material with the low electric resistance is configured to short-circuit the low electric resistance material when a harmonic magnetic field is applied. Eliminate breaks and create breaks by separating low-resistance materials during excitation and demagnetization.

In the superconducting magnet device according to the present invention, the superconducting film or the superconducting plate material forming the low electric resistance cover can have a lower electric resistance than the normal electric low resistance material, and the magnetism of the cut off portion can be reduced. Eddy current loss is reduced because the shield is ensured and the break is not exposed to the harmonic magnetic field.

Further, in the superconducting magnet device according to claim 17, the mesh woven by superconductivity forming the low electric resistance cover reduces eddy current loss for the same reason as the above-mentioned operation. In addition, mounting is easy because of its flexibility.

In the superconducting magnet device according to the eighteenth aspect, the superconducting wire attached to the edge of the low electric resistance cover reduces eddy current loss for the same reason as the above-mentioned operation.
In addition, a relatively small amount of superconductor can be used.

Further, in the superconducting magnet device according to claim 19, since the superconducting wire at the edge of the low electric resistance cover is an internally stabilized superconducting wire, the connection resistance between the superconducting wires is reduced by the low electric resistivity of the stabilizing matrix. Then, the electric resistance of the low electric resistance cover is further reduced.

Further, in the superconducting magnet device according to the twentieth aspect, when a plurality of through holes of the superconducting film or the superconducting plate material forming the low electric resistance cover are fixed to the surface of the inner vessel container, the superconducting magnet becomes an overflow port of the excess adhesive and has an adhesive property and Improve workability.

In the superconducting magnet device according to the present invention, the superconducting mesh forming the low electric resistance cover is rolled, so that the contact resistance between the superconducting wires is reduced. Become

Further, in the superconducting magnet device according to claim 22, since the rolled superconducting mesh is annealed, the electric resistance of the stabilization matrix having a high resistivity by rolling is reduced.

Further, in the superconducting magnet device according to claim 23, the roundness formed at the end of the low electric resistance cover to which the superconductor is applied reduces the loss (hysteresis loss) due to the history of the magnetic field penetrating into the superconductor. And improve the stability of the superconducting state of the low electric resistance cover.

According to a twenty-fourth aspect of the present invention, there is provided a superconducting magnet apparatus comprising a low electric resistance cover to which a superconductor is applied, a small amount of superconducting material at an end portion and a large amount of stabilizing material. When concentrated on the superconducting member at the edge of the resistance cover, the shielding current flows stably to the critical current density because the stability of the superconducting state is high.

Further, in the superconducting magnet device according to the twenty-fifth aspect, the superconductor or the superconducting wire attached in parallel with the cut-off portion of the low electric resistance material is thermally superconducted by the heater, the normal conducting state, that is, the low electric resistance. High electric resistance can be controlled, eddy current loss is reduced by increasing the resistance when the superconducting coil is demagnetized, and the superconducting state is set when a harmonic magnetic field is applied from the outside, and the high electric resistance portion is bypassed with low electric resistance. This enables loss reduction due to eddy current. Furthermore, the superconducting state is stably maintained because the harmonic magnetic field is not directly applied to the superconductor or the superconducting wire by the low electric resistance cover.

Further, in the superconducting magnet device according to the twenty-sixth aspect, the thermometer in the vicinity of the heater controls the temperature appropriately, avoids danger such as burning of the heater, and reduces the temperature to the minimum temperature at which the superconducting wire becomes normal conducting. Thus, it is possible to set the amount of heat applied by the heater.

According to a twenty-seventh aspect of the present invention, in the superconducting magnet device, the cut-off portion of the low-resistance material of the electromagnetic force supporting member and the low electric resistance cover covering the cut-off portion are formed by an eddy current loss for the same reason as in the ninth aspect. To reduce.

In the superconducting magnet device according to claim 28, no eddy current is generated across the insulating portion by the electrically insulating material of the electromagnetic force supporting member, and no heat is generated by the eddy current.

In the superconducting magnet device according to the present invention, the inner container is extended in the expansion direction by exciting the superconducting coil by means of adjusting the tensile force in the supporting direction applied to the electrically insulating material sandwiched between the electromagnetic force supporting members. An initial tensile stress is applied to prevent deformation.

[0066]

【Example】

Embodiment 1 FIG. Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a partial cross section of a superconducting coil housed in an inner vessel container in the superconducting magnet apparatus according to the first embodiment of the present invention, and FIG. It is a perspective view which shows an external appearance. In the figure, 1 to 3 are the same as those in the conventional art, and the description thereof is omitted.
Numeral 11 denotes a high electric resistance portion which forms a cut-off portion of the low electric resistance material 3 in the inner tank 2 and is provided in the eddy current flow path shown in FIG.

Next, the operation will be described. The eddy current generated on the surface of the inner vessel 2 during excitation and demagnetization of the superconducting coil 1 of the superconducting magnet device flows as shown by the arrow in FIG. 44- (B), but the low electric resistance material 3 is not provided in this flow path. In the high electric resistance part 11, the eddy current flows through the inner vessel 2 itself, that is, the high resistance stainless steel, and the resistance of the flow path becomes high electric resistance, so that the eddy current induced in the inner vessel 2 is reduced. Eddy current loss of the holding inner tank container 2 is reduced. Thereby, the evaporation of the refrigerant for cooling the superconducting coil 1 is reduced.

Embodiment 2 FIG. In the first embodiment, the high electrical resistance portion 11 is provided in the flow path of the eddy current generated on the surface of the inner vessel 2 during the excitation and demagnetization of the superconducting coil shown in FIG. FIG. 44- (A) as shown in FIG.
If the high electric resistance portion 11 is arranged so as to avoid the flow path of the eddy current caused by the harmonic magnetic field from the running ground coil described in the above section, the flow path of the eddy current generated during the excitation demagnetization becomes high. The resistance of the flow path is increased due to the inclusion of the resistance part, the eddy current is small and the eddy current loss of the inner vessel is suppressed, and the eddy current generated by the harmonic magnetic field does not flow through the high electric resistance part. Since the magnitude of the eddy current is determined by the inductance of the flow path, the eddy current loss of the inner vessel 2 is suppressed.

Embodiment 3 FIG. The third embodiment is different from the first embodiment.
And the high electric resistance portion described in 2 is located on the side other than the inner tank 2 on the side to which the harmonic fluctuating magnetic field from the ground coil is applied, as shown in FIG. In addition to the above, it is possible to magnetically shield the harmonic magnetic field and suppress the eddy current loss generated in the superconducting coil 1.

Embodiment 4 FIG. Further, in each of the above embodiments, the high electric resistance portion 11 is formed on the surface of the inner tank container 2 without the low electric resistance material 3, but as shown in FIG.
When the superconducting wire 12 is in the superconducting state, that is, when the superconducting wire 12 is running, that is, when the superconducting wire 12 is running, the eddy current of the inner tank 2 is low electric current. The resistance material and the superconducting wire 12 are used as a flow path, and eddy current loss of the inner vessel container due to a harmonic magnetic field is suppressed. Also, when the superconducting wire 12 is in a normal conducting state, that is, during the excitation and demagnetization of the superconducting coil, the eddy current of the inner vessel is caused to flow through the high electric resistance portion. Is suppressed.

Embodiment 5 FIG. Further, in the superconducting wire 12 for short-circuiting the low electrical resistance material 2 in the fourth embodiment, the stabilizing material covering the superconducting wire 12 (normal-conducting metal, not shown) is 10 ^-5 to when the temperature exhibiting a superconducting state 10 ^-4 Ωc
m, so that the metal has a high electrical resistivity,
When the superconducting wire 12 exceeds the critical value and undergoes normal conduction transition, high electric resistance occurs, and the eddy current generated during excitation and demagnetization uses the high electric resistance portion and the superconducting wire having high electric resistance as a flow path, and the eddy Current loss is suppressed.

Embodiment 6 FIG. Further, as shown in FIG. 6, a heater wire 13 is adjacent to the superconducting wire 12
4 and a superconducting coil 1
During the demagnetization, the superconducting wire 12 is heated by the heater wire 13 by the external power source 14 to be in a normal conducting state, and an eddy current generated in the inner vessel container flows through the high electric resistance portion and the superconducting wire 12 in the normal conducting state. As a result, the eddy current loss of the inner tank is suppressed. On the other hand, the superconducting wire 1
2 is in a superconducting state, and the eddy current due to the harmonic magnetic field from the ground coil is made to flow through the low electric resistance part 3 and the superconducting superconducting wire, thereby suppressing the eddy current loss of the inner vessel.

Embodiment 7 FIG. Further, as shown in FIG. 7, the heater wire 13 is adjacent to the superconducting wire 12 of the fourth embodiment, and the closed circuits 15a and 15b of the heater wire 13 in which the fluctuating magnetic field during the demagnetization of the superconducting coil 1 is linked. During the excitation and demagnetization, a fluctuating magnetic field generated by the superconducting coil 1 causes an induced current to flow through the heater wire 13 to heat the superconducting wire 12 to a normal conducting state. As a result, the superconducting wire 12 is in a superconducting state, and the same operation and effect as those of the sixth embodiment are obtained.

Embodiment 8 FIG. In Example 8 shown in FIG. 8, the critical current value of the superconducting wire 16 short-circuiting the low electric resistance material 3 is lower than the eddy current value generated during the demagnetization of the superconducting coil 1, and the harmonic current from the ground coil is reduced. Since the eddy current is higher than the eddy current value generated by the wave magnetic field, the superconducting wire 16 becomes a normal conducting state due to an excessive eddy current flowing on the inner vessel surface and the superconducting wire 16 during the demagnetization, and the eddy current becomes a high electric resistance material. On the other hand, during traveling, the eddy current due to the harmonic magnetic field from the ground coil is minute, so that the superconducting wire 16 remains in a superconducting state, and the eddy current flows through the low electric resistance material and the superconducting wire. Thus, the same operation and effect as those of the sixth embodiment are obtained.

Embodiment 9 FIG. In Embodiment 8, the single superconducting wire 16 short-circuiting the low-resistance material 3 is shown as a single superconducting wire. However, as shown in FIG. The critical current value and the number of components so as to be lower than the current value generated on the surface of the inner vessel 2 and higher than the current value generated on the surface of the inner vessel 2 due to the harmonic fluctuating magnetic field from the ground coil May be selected.

Embodiment 10 FIG. Hereinafter, Example 10 of the present invention
Will be described with reference to FIG. FIG. 10 shows Embodiment 10 of the present invention.
FIG. 2 is a perspective view illustrating a configuration of a superconducting magnet device in FIG. In the figure, 2, 3, and 11 are the same as those in FIG. 1 of the first embodiment, and the description thereof is omitted. Reference numeral 17 denotes a low electric resistance cover made of, for example, aluminum, which covers the high electric resistance portion 11;
Is an insulating material interposed between the low electric resistance cover 17 and the low electric resistance material 3.

Next, the operation will be described. The electric time constant of the circuit of the eddy current generated on the surface of the inner vessel container 2 at the time of excitation and demagnetization is represented by τ.
In this case, the presence of the high electric resistance portion 11 in a part of the inner tank vessel 2 causes a large electric resistance, and the condition of ω << 1 / τ is satisfied with respect to the fluctuating magnetic field frequency ω at the time of demagnetization. Reduction is possible. However, ω >> 1 / τ from the ground coil to the harmonic fluctuating magnetic field, and a loss proportional to the resistance of the eddy current circuit occurs. In the present embodiment, in order to shield the high electric resistance portion 11 from being exposed to the harmonic magnetic field, a low electric resistance cover 17 that covers the high electric resistance portion 11 and is electrically insulated from the inner vessel 2 is provided. It has a configuration. Since the high electric resistance portion 11 is magnetically shielded by the eddy current induced in the low electric resistance cover 17 by the external fluctuating magnetic field, the loss due to the eddy current in the high electric resistance portion 11 can be reduced. Alternatively, the low electric resistance cover 17 and the low electric resistance material 3 are overlapped with each other via the insulating material 18. The larger the overlapping area, the more the loss at the time of applying the externally variable magnetic field can be reduced. Needless to say.

Embodiment 11 FIG. In the tenth embodiment, the low electric resistance cover 17 is mounted on both ends with the insulating material 18 interposed therebetween. However, as the eleventh embodiment, as shown in FIG. For example, a solder connection 19 may be used.

With this configuration, the same effects as in the tenth embodiment can be obtained. In the production, one side of the low electric resistance cover 17 is made of the low electric resistance material 3 on the surface of the inner tank 2.
In addition, it is possible to firmly attach it by a technique such as soldering. For example, if the low electric resistance material is copper, the low electric resistance material 3 and the low electric resistance cover 1 are plated with copper.
7 can be connected with the same material. The more the low electric resistance cover 17 having such a configuration overlaps with the low electric material 3 via the insulating material 18, the more the high electric resistance portion 1
The eddy currents flowing through 1 are reduced and losses are reduced.

Embodiment 12 FIG. In the tenth embodiment, a single low electric resistance cover 17 covers the high electric resistance portion 11 with one sheet. However, as a twelfth embodiment, as shown in FIGS. Alternatively, it may be mounted so as to overlap with the inner tank 2 while being electrically insulated 18. By attaching a plurality of low electric resistance covers 17a, it is possible to make the high electric resistance portion 11 wide, and at the same time, it is possible to make one low electric resistance cover 17a small, and to attach one low electric resistance cover 17a. Fixing is easy because the working electromagnetic force can be reduced.

Embodiment 13 FIG. Further, in the twelfth embodiment, the plurality of low electric resistance covers 17a are electrically insulated by the low electric resistance material 3 or the high electric resistance part 11 and the insulating material 18, but as shown in FIG. If one end of the low electric resistance cover 17a is electrically and mechanically connected to the inner vessel container 2 by welding, brazing, soldering, or the like, the low electric resistance cover can be obtained in addition to the effects of the twelfth embodiment. 17a can be firmly fixed.

Embodiment 14 FIG. Hereinafter, Example 14 of the present invention
Will be described with reference to FIG. FIG. 15 shows Embodiment 14 of the present invention.
FIG. 2 is a perspective view showing a partially cross-sectional configuration of the superconducting magnet device in FIG. In the figure, 2 is an inner tank container, 5 is an inner tank container 2
Is a low electric resistance cover attached to a predetermined surface of the inner tank container 2.

Generally, when the outer vessel 5 is made of aluminum, when the inner vessel 2 causes relative vibration with respect to the outer vessel 5, the magnetic field of the superconducting coil 1 housed in the inner vessel 2 causes the outer vessel 5 to be vibrated. An eddy current is generated in the inner tank 5 and when a harmonic magnetic field generated by the eddy current is applied to the inner vessel 2, the eddy current may be lost. Since the vibration of the inner tank 2 has a unique vibration mode, the location where the eddy current is generated by the relative vibration is limited. By intensively attaching the low electric resistance cover 20 to such a portion, eddy current loss due to a harmonic magnetic field caused by relative vibration can be reduced. FIG. 15 shows a low electric resistance cover 20 that is effective when bending resonance occurs. Since eddy currents 21 are generated at both ends of the inner tank with respect to bending, the low electric resistance cover 20 is attached to this location. The white arrow 22 in the figure indicates the vibration direction.

When the low electric resistance covers described in the above Examples 10 to 14 are manufactured, annealing is performed after processing a low resistance plate material (eg, a pure aluminum plate or a copper plate). This eliminates the increase in electrical resistivity that occurs during processing. Further, since the low electric resistance cover is smaller in size than the inner tank container, it can be easily annealed.

Embodiment 15 FIG. Hereinafter, a fifteenth embodiment of the present invention will be described.
Will be described with reference to FIG. FIG. 16 shows Embodiment 15 of the present invention.
1 is a perspective view showing a configuration of a main part of a superconducting magnet device in FIG.
FIG. 7 is a sectional view taken along the line XVII-XVII in FIG. In the figure, 1 is a superconducting coil, 23 is an inner vessel container formed of a high electric resistance material, and 24 is an inner vessel vessel 23
A container made of a low electric resistance material having a surface and a predetermined space 24a and entirely covering the container, and having a valve 25 of an opening / closing means operable at room temperature at an upper portion thereof. Reference numeral 26 denotes a spacing piece made of a material having a low thermal conductivity, for example, GFRP, fixed so as to obtain a space between the inner tank container 23 and the container 24, and 23a is provided below the inner tank container 23 and communicates with a predetermined space 24a. It is a hole.

The principle of operation of this superconducting magnet device is as follows. First, the upper valve 25 is closed during demagnetization. Here, when the surface of the low electric resistance container 24 is heated by the generation of the eddy current, helium gas is accumulated in the space between the inner tank container 23 and the low electric resistance container 24, and the low electric resistance container 24 is not cooled by the liquid helium. . As a result, the temperature of the low electric resistance container 24 further increases, the resistivity of the low electric resistance container 24 increases, and the eddy current is reduced, so that the amount of evaporation decreases. On the other hand, when a harmonic magnetic field is being applied, the upper valve 25 is opened. At this time, since the space is filled with liquid helium, the low electric resistance container 24 is always cooled, and since the resistance is small, the eddy current loss is small and the amount of evaporation is reduced.

Embodiment 16 FIG. In Example 15, the operation valve 25 was provided in the communication path of the space 24a of the refrigerant reservoir formed by covering the entire inner tank container 23 formed of the high electric resistance material with the container 24 formed of the low electric resistance material. As shown in FIGS. 18 and 19, only the cut-off portion 11 (high electric resistance portion) of the low electric resistance material 3 in the inner tank 2 having the surface provided with the low electric resistance material 3 as shown in FIGS. May be covered with a container 27 formed of a low electric resistance material so as to cover the surface of the inner tank container 2 and the predetermined space 27a, and a valve 25 operable at room temperature may be provided on each upper side. In the figure, reference numeral 28 denotes a hole which communicates with a predetermined space 27a provided below the inner tank container in a portion covered by the container.

The principle of operation is the same as that shown in the sixteenth embodiment. However, by partially using the above mechanism, it is relatively easy to attach it to the inner tank 2 having a complicated shape. Become.

Embodiment 17 FIG. Hereinafter, Example 17 of the present invention
Will be described with reference to FIG. FIG. 20 shows Embodiment 17 of the present invention.
2A shows a configuration of the superconducting magnet device, and FIG. 2A is a perspective view thereof, and FIG. 2B is a partial cross-sectional view taken along line BB in FIG. In the drawing, reference numeral 2 denotes an inner vessel container, 3 denotes a low electric resistance material, 11 denotes a high electric resistance portion which is a cut off portion of the low electric resistance material, and 29 denotes a switch formed of a low electric resistance material and operable from a room temperature part. It is attached to the high electric resistance part 11. Reference numeral 30 denotes an operation rod having an opening / closing mechanism 30a for driving (opening / closing) the switch 29, which is made of an electrically insulating material having a low thermal conductivity.

The operation principle in this embodiment will be described. At the time of excitation / demagnetization, the rod 30 is pulled from the room temperature portion and the switch 29 is opened. At this time, the eddy current flows through the high electric resistance portion 11, and when the magnetic field fluctuation is slow and the resistance of the current path is large, that is, since the condition of ω << 1 / τ is satisfied, the loss decreases. When a harmonic magnetic field is applied,
The switch 29 is closed. At this time, when the electric resistance of the surface is small and the magnetic field fluctuates quickly, that is, the condition of ω >> 1 / τ is satisfied. Therefore, the lower the electrical resistivity, the lower the loss,
The amount of evaporation decreases.

Embodiment 18 FIG. Hereinafter, an embodiment 18 of the invention will be described.
Will be described with reference to FIG. FIG. 21 shows Embodiment 18 of the present invention.
2A shows a configuration of the superconducting magnet device, and FIG. 2A is a perspective view thereof, and FIG. 2B is a detailed cross-sectional view taken along the arrow B in FIG. In the figure, 2, 3, 11, and 18 represent the first embodiment.
0 and the description is omitted. Reference numeral 31 denotes a low electric resistance cover made of a superconducting film or a superconducting plate.

The same effect can be obtained by applying any of the methods shown in Examples 10 to 13 as a method of attaching the low electric resistance cover made of a superconducting film or a superconducting plate. Since the superconducting film or the superconducting plate has zero electric resistance, the high electric resistance portion 11 is completely magnetically shielded at any frequency, so that heat generation due to eddy current is reduced. As shown in FIG. 21- (B), a low electric resistance cover 31 made of a superconducting film or a superconducting plate is used.
As a superconducting portion 31a and a stabilizing matrix 31b,
For example, use of a multilayer structure such as copper or aluminum improves the stabilization of the superconducting state with respect to a fluctuating magnetic field.

Embodiment 19 FIG. In Example 18, a superconducting film or a superconducting plate 31 was used as the low electric resistance cover, but as Example 19, a superconducting mesh formed by knitting a superconducting wire 32a from which an insulating coating was removed as shown in FIG. 32 may be used as a low electric resistance cover. Regarding the method of attaching the superconducting mesh 32, the same effect can be obtained by performing any of the methods shown in Examples 10 to 13. Since the superconducting mesh 32 has a low electric resistance, the high electric resistance portion 11 is efficiently magnetically shielded, so that heat generation due to eddy current is reduced. In addition,
By impregnating the superconducting mesh 32 with a low-resistance metal having a low electric resistance, such as solder, a low-electric-resistance cover having high mechanical strength and low electric resistance can be obtained.

Embodiment 20 FIG. Example 19 shows the case where the superconducting mesh 32 is used as the low electric resistance cover.
As a twentieth embodiment, as shown in FIG. 23, the superconducting wire 33 is attached to the edge of the low electric resistance cover 17 shown in the tenth embodiment using a low melting point metal such as solder 34 so as to have a low connection resistance. The low electric resistance cover 35 may be used. The same effect can be obtained by mounting the low electric resistance cover 35 having the superconducting wire 33 at the edge by any of the methods shown in Embodiments 10 to 13. Since the low electric resistance cover 35 has the superconducting wire 33 at the edge thereof, the electric resistance becomes equivalently low, and the high electric resistance portion 11 is efficiently magnetically shielded, so that heat generation due to eddy current is reduced.

When the superconducting wire attached to the edge is made of a superconducting tape, the thickness of the low electric resistance cover 35 can be reduced. In addition, the magnetic field shielding performance of the low electric resistance cover 35 is improved by using an oxide superconductor tape or the like.

Embodiment 21 FIG. FIG. 24 shows a main part of a twenty-first embodiment of the present invention.
The internal stabilizing superconducting wire 36 is used as the superconducting wire described in FIG. Since the thickness of the stabilization matrix 36b outside the superconductor portion 36a is small, the connection resistance between the superconducting wires of the internally stabilized superconducting wire 36 can be reduced.

Embodiment 22 FIG. When manufacturing the inner tank container having the configuration of Examples 10 to 13 or Examples 18 to 20,
A method for attaching the low electric resistance cover will be described as a twenty-second embodiment with reference to FIGS. In FIG. 25, for example, a low electric resistance cover can be firmly attached to the inner vessel container by fixing with an electric insulating bolt 37 using an insulating bolt 37 made of, for example, ceramic. In FIG. 26, the low electric resistance cover is attached with an electrically insulating adhesive 38, and this method is easy to manufacture.

Embodiment 23 FIG. One example of the shape of the low electric resistance cover in the inner tank container having the configuration of Examples 10 to 13 or Examples 18 and 19 will be described with reference to FIG. As shown in the figure, the low electric resistance plate material 39 divided into several parts
2 shows a state having a low electric resistance cover integrally formed by applying a plating process after bonding.
Here, since the low electric resistance plate material 39 is electrically coupled by the plating 40, it is easy to manufacture a low electric resistance cover having a complicated shape. Naturally, the same effect can be obtained by bonding with a low melting point metal.

Embodiment 24 FIG. FIG. 28 is a perspective view showing a main part of Embodiment 24 of the present invention. The superconducting film or the superconducting plate 31 described in Examples 10 to 13 or the low electric resistance cover 17 or Example 18 has a plurality of through holes 41. Reference numeral 38 denotes an electrically insulating adhesive. By using a superconducting film or plate 31 having a through hole 41, when the superconducting film or plate 31 is fixed to the surface of the inner vessel container 2 by bonding, an excess adhesive 38 overflows from the through hole 41, so that the adhesive 38 The workability is improved at the same time as the thickness of the layer is easily controlled. Further, when the adhesive 38 overflowing from the through hole 41 is hardened,
The shear strength between the surface of the inner tank 2 and the low electric resistance cover 17 is improved.

Embodiment 25 FIG. FIG. 29 is a perspective view showing a main part of Embodiment 25 of the present invention. The superconducting magnet device described in Example 19 has a low electric resistance cover manufactured by rolling a superconducting mesh 32 knitted with a superconducting wire 32a. It is considered that the rolling reduces the contact resistance between the superconducting wires 32a. Further, since the thickness is reduced and the space factor of the superconducting material is improved, the superconducting magnet device can be downsized.

In the superconducting magnet device shown in Embodiment 25, the superconducting mesh 32 knitted with the superconducting wire 32a is used.
If the low electric resistance cover is formed by annealing at a heat treatment temperature of 400 ° C. or less after rolling, the superconducting wire 32a after the rolling process has a high resistivity of the stabilization matrix, and is converted into a required shape. Annealing after processing the low electric resistance cover can reduce electric resistance. At an annealing temperature of 400 ° C. or less, there is no deterioration of the superconductor.

Embodiment 26 FIG. FIG. 30 is a perspective view showing a main part of Embodiment 26 of the present invention. In the superconducting magnet devices described in the above Examples 18 and 19, the end portions of the superconducting film or the superconducting plate 31 or the superconducting mesh 32 are rounded so as to reduce the concentration of magnetic flux in the direction perpendicular to the end surface. Is attached. In the figure, reference numeral 42 denotes lines of magnetic force. Therefore, the loss (hysteresis loss) due to the history of the magnetic field penetrating into the superconductor can be reduced, and the stability of the superconducting state is improved in the low electric resistance cover using the superconducting material.

Embodiment 27 FIG. FIG. 31 is a perspective view showing a main part of Embodiment 27 of the present invention. In the superconducting magnet devices described in Examples 18 and 19, the critical current density at the end of the superconducting film, the superconducting plate 31, or the superconducting mesh 32 is smaller than that near the center. In the figure, 43 is a superconducting portion, 44 is a stabilizing material, and 45 is a line of magnetic force. Here, by increasing the amount of the stabilizing material 44 made of a low electric resistance metal at the end portion of the superconducting film or the superconducting plate, the low electric resistance cover having such a configuration completely shields the external magnetic field. At the end, the shielding current can stably flow to the critical current in the superconducting portion 43.

Embodiment 28 FIG. FIG. 32 is a perspective view showing a main part of Embodiment 28 of the present invention. In the superconducting magnet device according to Examples 10 to 13 or 18 to 20,
A low electrical resistance cover is mounted on a superconductor mounted in parallel with the high electrical resistance portion 11 or a superconducting wire having a high electrical resistance matrix. Further, a heater wire 47 is attached near the superconductor or the superconducting wire 46. By using the heater wire 47, the superconductor or the superconducting wire 46 can be controlled to a superconducting state / normal conducting state, in other words, a low electric resistance and a high electric resistance. The eddy current loss is reduced by this, and when a harmonic magnetic field is applied from the outside, a superconducting state is set, and the high electrical resistance portion slit portion is bypassed with a low electrical resistance to flow over the high electrical resistance portion 11. The loss due to the eddy current can be reduced even for a large eddy current path. Further, since the harmonic magnetic field is not directly applied to the superconductor or the superconducting wire 46, the superconducting state is kept stable.

Embodiment 29 FIG. FIG. 33 is a perspective view showing a main part of Embodiment 29 of the present invention. In Example 28 above,
Using the heater wire 47, the superconductor 4 of the high electrical resistance portion 11
6 is turned on and off to reduce eddy current loss during excitation and when a harmonic magnetic field is applied. In addition, the temperature near the superconductor 46 is monitored using a thermometer 48, and the The amount of heat to be applied by the heater wire 47 is determined so as to be the lowest temperature at which the conductive state occurs. Generally, since the surface of the inner vessel container is in a vacuum state, when heat is applied by the heater wire 47, the temperature of the heater wire 47 becomes unexpectedly high, and the heater wire 47 may be burned. By providing a thermometer near the heater wire portion 47, such a danger can be avoided. Further, since the amount of heat applied by the heater wire 47 can be set so that the superconductor 46 has the lowest temperature at which the superconductor 46 becomes a normal conductor, the evaporation amount of liquid helium can be reduced.

Embodiment 30 FIG. FIG. 34 is a perspective view showing a main part of Embodiment 30 of the present invention. A low electric resistance material 3 is provided on the surface of an electromagnetic force support member 49 made of a high electric resistance material for preventing the inner tank container 2 containing the superconducting coil 1 from being deformed by an electromagnetic force. And has a low electric resistance cover 50 that forms the high electric resistance portion 11 and has a low electric resistance cover 50 that is electrically insulated from the electromagnetic force supporting member 49 that covers the high electric resistance portion 6. When exciting the superconducting coil 1, the eddy current path passing through the electromagnetic force supporting portion 49 has high electric resistance, so that eddy current loss at the time of excitation is reduced. Further, when the harmonic fluctuating magnetic field is applied from the outside, the eddy current loss in the high electric resistance portion 11 is small because the low electric resistance cover 50 exists. Here, the same effect can be obtained by applying any one of the embodiments 10 to 13 as the method of arranging the low electric resistance cover.

Embodiment 31 FIG. FIG. 35 is a perspective view showing a main part of Embodiment 31 of the present invention. The electromagnetic force supporting member 49 for preventing the inner vessel 2 from being deformed by the electromagnetic force is made of an insulating material 5.
1, the eddy current does not flow through the electromagnetic force supporting member 49 during the excitation of the superconducting coil 1, so that eddy current heat generation is reduced.

Embodiment 32 FIG. Embodiment 32 of the present invention is shown in FIG.
No. 6 will be described. In the electromagnetic force supporting member 49 sandwiching the insulating material 51 described in the embodiment 31, the attachment portion between the insulating material 51a and the metal portion 49a is tapered.
Since the electromagnetic force at the time of excitation of the superconducting coil 1 is applied only in the expansion direction, the strength is high with respect to the electromagnetic force if it is tapered in the direction shown in the sectional view 37 along the line XXXVII-XXXVII in FIG.

By providing a cylindrical or ring-shaped high-strength member 52 on the outer periphery of the insulating material 51a as shown in FIG. 38, the strength of the connection between the insulating material 51a and the metal portion 49a can be improved.

Embodiment 33 FIG. FIG. 39 is a sectional view showing a main part of a thirty-third embodiment of the present invention. Regarding the electromagnetic force supporting member 49 described in Embodiment 32, a pulling mechanism, for example, a metal portion 49 having screw holes on both ends and screwed by rotation.
Since the structure has the tension adjusting means 53 that pulls the a from each other, it is possible to apply an initial tensile stress so that the inner vessel 2 is not deformed in the expansion direction by the excitation of the superconducting coil 1. Further, if a means for preventing loosening, for example, welding, is applied after setting the initial tensile force, the strength is further increased.

[0111]

As described above, according to the first aspect of the present invention, a superconducting coil formed by winding a superconducting wire, a superconducting coil immersed in a refrigerant and stored, and a low electric resistance material provided on the surface. In a superconducting magnet device provided with an inner tank container and an outer tank container that accommodates the inner tank container in a vacuum insulated manner and facing the ground coil, the inner tank container has a flow path of eddy current on the surface. In part, there is a cut-off portion of a low electric resistance material so that the cut-off portion forms a high electric resistance portion of an eddy current flow path,
According to the second aspect, the high electric resistance portion is provided in the flow path of the eddy current generated on the inner tank surface during the excitation and demagnetization of the superconducting coil. Therefore, the high electric resistance portion is generated by the fluctuating magnetic field during the excitation and demagnetization of the superconducting coil. There is an effect that a superconducting magnet device is obtained in which the eddy current on the surface of the inner vessel container is reduced, the eddy current loss is reduced, and the evaporation of the refrigerant for cooling the superconducting coil is reduced.

According to a third aspect of the present invention, in the first aspect, the high electric resistance portion is not provided in a flow path of an eddy current generated on the inner tank surface due to a harmonic fluctuating magnetic field from the ground coil. According to the fourth aspect, in the first aspect, the high electric resistance portion is formed on the flow path of the eddy current generated on the inner tank surface due to the harmonic fluctuating magnetic field from the ground coil and on the side to which the harmonic fluctuating magnetic field is applied. The surface of the inner tank vessel to which a harmonic magnetic field from the ground coil is applied in addition to the effect of claim 1, since the eddy current is generated in the flow path of the eddy current generated on the inner tank surface during excitation and demagnetization of the superconducting coil other than the tank surface The eddy current flow path has low electric resistance, and the eddy current loss of the inner tank can be further reduced.

According to a fifth aspect of the present invention, the low electrical resistance material is electrically short-circuited by a superconducting wire between the low electrical resistance materials across the high electrical resistance portion of the inner tank surface according to the first aspect. A heater wire which can be energized from an external power supply is provided adjacent to the superconducting wire between them, and according to claim 7, the heater wire is adjacent to the superconducting wire between low electric resistance materials and closed in series with the heater wire. Provide an eddy current circuit that constitutes the circuit,
According to claim 8, the critical current value of the superconducting wire between the low electric resistance materials is lower than the current value generated on the surface of the inner vessel container during the demagnetization of the superconducting coil, and the harmonic fluctuation magnetic field from the ground coil The superconducting wire that short-circuited the cutoff portion of the low-resistance material has a higher eddy current in the inner vessel when it is in a normal conducting state, that is, during excitation and demagnetization. The eddy current of the inner vessel is kept small because the high electric resistance part is used as a flow path, and the eddy current of the inner vessel is harmonically controlled by the low electric resistance material and the superconducting wire when the superconducting state, that is, when operating with the ground coil. This has the effect of reducing the eddy current loss of the inner vessel container due to the wave magnetic field and reducing the evaporation of the refrigerant that cools the superconducting coil.

According to a ninth aspect of the present invention, a superconducting coil formed by winding a superconducting wire, an inner tank container having the superconducting coil immersed and stored in a refrigerant and having a low electric resistance material provided on the surface thereof, An outer tank container that houses the tank container in a vacuum insulated manner is provided. In the superconducting magnet device provided on the vehicle body side facing the ground coil, the inner tank container partially has a low electric resistance in a flow path of eddy current on the surface. The material has a cut-off portion, and the cut-off portion forms a high electric resistance portion of the eddy current flow path, and is electrically insulated from the inner vessel container and the low electric resistance material and has a low electric resistance covering the high electric resistance portion. Since the cover is provided, the eddy current is induced by the external fluctuating magnetic field during traveling and the high electric resistance portion is magnetically shielded during traveling, so that the loss due to the eddy current in the high electric resistance portion is reduced. Evaporation of the refrigerant that cools the superconducting coil It can be small.

Further, according to the tenth aspect, a superconducting coil formed by winding a superconducting wire, an inner tank container having the superconducting coil immersed and stored in a refrigerant and having a low electric resistance material provided on the surface thereof, An outer tank container that houses the tank container in a vacuum insulated manner is provided. In the superconducting magnet device provided on the vehicle body side facing the ground coil, the inner tank container partially has a low electric resistance in a flow path of eddy current on the surface. The cutoff portion has a high electrical resistance portion of the flow path of the eddy current, and is electrically connected to the low electrical resistance material on one side of the cutoff portion to form a low electrical resistance portion on the other side of the cutoff portion. Since the low electric resistance cover which is electrically insulated from the electric resistance material and the high electric resistance part and covers the high electric resistance part is provided, in addition to the effect of the ninth aspect, the mounting of the low electric resistance cover can be made strong and easy.

According to the eleventh aspect, in the ninth or tenth aspect, the low electric resistance cover is formed by a plurality of combinations having overlapping portions, and the overlapping portions are formed so as to be electrically insulated from each other. At the same time, it is possible to widen the cutoff portion of the electric resistance material, and at the same time, it is possible to make one low electric resistance cover small, so that the electromagnetic force acting on one low electric resistance cover is small, and fixing is easy.

Further, according to the twelfth aspect, a superconducting coil formed by winding a superconducting wire, an inner tank container provided with the superconducting coil immersed in a refrigerant and provided with a low electric resistance material on its surface, A superconducting magnet device provided on the vehicle body facing the ground coil, wherein the outer tank container is vibrated by a harmonic fluctuating magnetic field from the ground coil. A low electric resistance cover is provided to cover the corresponding position on the surface of the inner tank vessel, which has a large relative displacement with respect to the eddy current, so that eddy current loss due to harmonic magnetic fields due to relative vibration can be reduced, and evaporation of refrigerant that cools the superconducting coil Can be reduced.

According to a thirteenth aspect, a superconducting coil formed by winding a superconducting wire, an inner tank container formed by immersing the superconducting coil in a refrigerant and housed and formed of a high electric resistance material, and an inner tank container An outer vessel container for vacuum-insulating and storing the inside, and in the superconducting magnet device provided on the vehicle body side facing the ground coil, the refrigerant flows through the inner vessel vessel through the inner space by covering the inner vessel vessel A low electric resistance container formed so as to be provided in the lower electric resistance container and an upper refrigerant passage communicating with the inside of the low electric resistance container, and the refrigerant passage is operated to be closed during excitation and demagnetization of the superconducting coil and to be opened during application of a harmonic magnetic field. 2. An opening / closing means for opening and closing, wherein
According to 4, the inner vessel has a cut-off portion of a low electric resistance material in a part of the eddy current flow path on the surface, and the cut part forms a high electric resistance part of the eddy current flow path and a high electric resistance part. A low electric resistance container formed so as to cover the respective parts and allow the refrigerant to flow through the inner space into the inner tank container, and a superconducting coil for demagnetizing the refrigerant path in the upper refrigerant path communicating with the low electric resistance container. The opening and closing means for operating the open circuit during the application of the harmonic magnetic field to the closed circuit is provided in the middle, so that the amount of refrigerant in the space between the low electric resistance container and the inner vessel container is adjusted by the opening and closing means so that the low electric resistance container is opened. By controlling the resistance value, the eddy current loss can be reduced in both the case of excitation and demagnetization and the case of application of a harmonic magnetic field, and the evaporation of the refrigerant for cooling the superconducting coil can be reduced.

According to a fifteenth aspect, a superconducting coil formed by winding a superconducting wire, an inner tank container having the superconducting coil immersed and stored in a refrigerant and provided with a low electric resistance material on its surface, An outer tank container for housing the inner tank container in a vacuum-insulated state is provided. In the superconducting magnet device provided on the vehicle body opposite to the ground coil, the inner tank container partially has low electric power in a flow path of eddy current on the surface. An electrical part that has a cut-off portion of a resistance material, forms a high electrical resistance portion of an eddy current flow path at the cut-off portion, and short-circuits the high electrical resistance portion that can be externally operated to the high electrical resistance portion with low electrical resistance. Since the switch is provided, when the electric switch is applied with a harmonic magnetic field, the low electric resistance material is short-circuited to eliminate the disconnection, and during the excitation and demagnetization, the low electric resistance material can be separated to form the disconnection, Both when demagnetizing and applying a harmonic magnetic field Reduction of eddy current loss for can effectively.

Further, according to claim 16, claims 9 to 1
In either of the above two cases, a superconducting film or a superconducting plate is attached as a low electric resistance cover, so that the electric resistance can be made lower than the normal electric low electric resistance, and the magnetic shielding of the cut part can be ensured. Is no longer exposed to the harmonic magnetic field, so that eddy current loss can be reduced.

Further, according to claim 17, claims 9 to 1
In any of 2 above, since the mesh woven with the superconducting wire without the insulating coating is used for the low electric resistance cover, the superconducting mesh ensures the magnetic shielding for the same reason as the operation of the preceding paragraph, and the eddy current loss is reduced. Can be reduced.

Further, according to claim 18, claims 9 to 1
(2) In any one of (2) and (3), since the low electric resistance cover is formed by attaching a superconducting wire to the edge thereof, the superconducting wire attached to the edge reduces eddy current loss for the same reason as in the preceding paragraph, and is structurally Provides a relatively small amount of superconductor.

Further, according to claim 19, since the internally stabilized superconducting wire is used as the superconducting wire in claim 17 or 18, the connection resistance between the superconducting wires decreases due to the low electric resistivity of the stabilizing matrix. The electric resistance of the low electric resistance cover can be further reduced.

According to claim 20, claims 9 to 1 are provided.
2. In any one of the above, since the low electric resistance cover, the superconducting film, or the superconducting plate has a plurality of through holes, the plurality of through holes serve as overflow holes for the excess adhesive when fixed to the inner tank container surface. Improves adhesion and workability.

According to the twenty-first aspect, in the seventeenth aspect, the mesh knitted with the superconducting wires is rolled, so that the contact resistance between the superconducting wires is reduced. Can be

According to claim 22, in claim 21, since the mesh is annealed at a heat treatment temperature of 400 ° C. or less after rolling, the mesh having the increased resistivity of the stabilization matrix by rolling is used. The electric resistance can be reduced.

According to the twenty-third aspect, in the sixteenth or seventeenth aspect, the surface of the low electric resistance cover facing the external line of magnetic force is formed so that a magnetic field component perpendicular to the surface is not generated at the end. As a result, the loss (hysteresis loss) due to the history of the magnetic field penetrating into the superconductivity is reduced, and the stability of the superconducting state of the low electric resistance cover is improved.

According to claim 24, according to claim 16,
In any of 17 and 24, the stabilizing material at the end was increased from the vicinity of the center so that the critical current density at the end of the surface of the low electric resistance cover facing the line of external magnetic force was smaller than that near the center. When the shielding current concentrates on the superconducting portion at the edge of the low electric resistance cover, the shielding current flows stably to the critical current density because the stability of the superconducting state is high.

Further, according to the twenty-fifth aspect, a superconducting coil formed by winding a superconducting wire, an inner tank container having the superconducting coil immersed and stored in a refrigerant and provided with a low electric resistance material on its surface, An outer tank container that houses the tank container in a vacuum insulated manner is provided. In the superconducting magnet device provided on the vehicle body side facing the ground coil, the inner tank container partially has a low electric resistance in a flow path of eddy current on the surface. It has a break in the material, which forms the high electrical resistance portion of the eddy current flow path, and a low electrical resistance in the superconductor or the superconducting wire with a high electrical resistance matrix attached in parallel with the break. A cover is provided,
In addition, since a heater wire is attached to the superconductor or the superconducting wire, the heater can be thermally controlled to a superconducting state or a normal conducting state, that is, a low electric resistance or a high electric resistance, and the resistance is increased when the superconducting coil is demagnetized. To reduce the eddy current loss, and when a harmonic magnetic field is applied from the outside, a superconducting state is established to bypass the high electric resistance portion with low electric resistance. This enables loss reduction due to eddy current. Furthermore, the superconducting state is stably maintained because the harmonic magnetic field is not directly applied to the superconductor or the superconducting wire by the low electric resistance cover.

According to the twenty-sixth aspect, the thermometer is provided in the vicinity of the heater in the twenty-fifth aspect, so that the temperature can be properly controlled, the danger such as burnout of the heater can be avoided, and the superconducting wire can be connected to the normal conductivity. The amount of heat applied by the heater can be set such that the temperature becomes the lowest.

According to a twenty-seventh aspect, a superconducting coil formed by winding a superconducting wire, an inner tank container having the superconducting coil immersed and stored in a refrigerant and provided with a low electric resistance material on its surface, An outer tank container that houses the inner tank container in a vacuum insulated condition. The superconducting magnet device installed on the vehicle body facing the ground coil prevents the inner tank container from being deformed by electromagnetic force. In the overcurrent flow path on the surface of the electromagnetic force supporting member to have a cut-off portion of a low electric resistance material, a high electric resistance portion is formed at the cut-off portion, and is electrically insulated from the electromagnetic force supporting member. Since the low electric resistance cover that covers the high electric resistance part is provided, the high electric resistance part is magnetically shielded, so that the loss due to the eddy current in the high electric resistance part can be reduced, and the evaporation of the refrigerant for cooling the superconducting coil can be reduced.

According to a twenty-eighth aspect, a superconducting coil formed by winding a superconducting wire, an inner tank container having the superconducting coil immersed and stored in a refrigerant and provided with a low electric resistance material on its surface, An outer tank container for vacuum-insulating the inner tank container, and an electromagnetic force support for preventing the inner tank container from being deformed by electromagnetic force in a superconducting magnet device provided on the vehicle body facing the ground coil. Since the member is formed with an electrically insulating material interposed therebetween, no eddy current is generated across the insulating portion, and no heat is generated by the eddy current.

According to claim 29, in claim 28, since the means for adjusting the pulling force in the supporting direction of the electromagnetic force supporting member is provided, the inner tank container is prevented from being deformed in the expanding direction by the excitation of the superconducting coil. An initial tensile stress can be given, and the inner vessel container can be strengthened.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a partial cross section of a superconducting coil housed in an inner vessel container in a superconducting magnet device according to Embodiment 1 of the present invention.

FIG. 2 is a perspective view showing an outer appearance of an inner vessel container in the superconducting magnet device according to the first embodiment of the present invention.

FIG. 3 is a perspective view showing an external appearance of an inner tank container in the superconducting magnet device according to the second embodiment of the present invention.

FIG. 4 is a perspective view showing an external appearance of an inner tank container in a superconducting magnet device according to Embodiment 3 of the present invention.

FIG. 5 is a perspective view showing an outer appearance of an inner vessel container in a superconducting magnet device according to Embodiment 4 of the present invention.

FIG. 6 is a perspective view showing a partial cross section of a superconducting coil housed in an inner vessel container in a superconducting magnet device according to Embodiment 6 of the present invention.

FIG. 7 is a perspective view showing an appearance of an inner vessel container in a superconducting magnet device according to Embodiment 7 of the present invention.

FIG. 8 is a perspective view showing an external appearance of an inner vessel container in a superconducting magnet device according to Embodiment 8 of the present invention.

FIG. 9 is a perspective view showing an appearance of an inner tank container in a superconducting magnet device according to Embodiment 9 of the present invention.

FIG. 10 is a perspective view showing an outer appearance of an inner vessel container in a superconducting magnet device according to Embodiment 10 of the present invention.

FIG. 11 is a perspective view showing an appearance of an inner tank container in a superconducting magnet device according to Embodiment 11 of the present invention.

FIG. 12 is a perspective view showing an appearance of an inner vessel container in a superconducting magnet device according to Embodiment 12 of the present invention.

FIG. 13 is a partial sectional view showing a main part of an inner tank container according to a twelfth embodiment of the present invention.

FIG. 14 is a partial cross-sectional view illustrating a main part of an inner tank container according to Embodiment 13 of the present invention.

FIG. 15 is a perspective view showing an appearance of an inner tank container in a superconducting magnet device according to Embodiment 14 of the present invention.

FIG. 16 is a perspective view showing the appearance of an inner tank container in the superconducting magnet device according to Embodiment 15 of the present invention.

FIG. 17 is a sectional view taken along lines XVII-XVII in FIG. 16;

FIG. 18 is a perspective view showing a partial cross section of a superconducting coil housed in an inner vessel container in a superconducting magnet device according to Embodiment 16 of the present invention.

FIG. 19 is a sectional view taken along the line XIX-XIX in FIG. 18;

20A and 20B show a superconducting magnet device according to a seventeenth embodiment of the present invention, showing a configuration of an inner tank container, in which FIG. 20A is an external perspective view and FIG. 20B is a cross-section taken along line BB in FIG. FIG.

21A and 21B show a configuration of an inner vessel container in a superconducting magnet device according to Embodiment 18 of the present invention, wherein FIG. 21A is an external perspective view thereof, and FIG. 21B is a detailed sectional view taken in the direction of arrow B in FIG. It is shown.

FIG. 22 is a perspective view showing an appearance of an inner vessel container in a superconducting magnet device according to Embodiment 19 of the present invention.

FIG. 23 is a perspective view showing an appearance of an inner vessel container in a superconducting magnet device according to Embodiment 20 of the present invention.

FIG. 24 is a perspective view illustrating a configuration of a main part according to a twenty-first embodiment of the present invention.

FIG. 25 is a perspective view showing a configuration of a main part according to a twenty-second embodiment of the present invention.

FIG. 26 is a perspective view showing another configuration of the main part in Embodiment 22 of the present invention.

FIG. 27 is a perspective view showing an appearance of an inner vessel container in a superconducting magnet device according to Embodiment 23 of the present invention.

FIG. 28 is a perspective view showing an appearance of an inner vessel container in a superconducting magnet device according to Embodiment 24 of the present invention.

FIG. 29 is a perspective view showing a configuration of a main part according to a twenty-fifth embodiment of the present invention.

FIG. 30 is a perspective view showing a configuration of a main part in Embodiment 26 of the present invention.

FIG. 31 is a perspective view showing a configuration of a main part in Embodiment 27 of the present invention.

FIG. 32 is a perspective view showing a configuration of a main part in Embodiment 28 of the present invention.

FIG. 33 is a perspective view showing a configuration of a main part according to a twenty-ninth embodiment of the present invention.

FIG. 34 is a perspective view showing an appearance of an inner vessel container in a superconducting magnet device according to Embodiment 30 of the present invention.

FIG. 35 is a perspective view showing an appearance of an inner vessel container in a superconducting magnet device according to Embodiment 31 of the present invention.

FIG. 36 is a perspective view showing an appearance of an inner vessel container in a superconducting magnet device according to Embodiment 32 of the present invention.

FIG. 37. Line XXXVII-XXXV in FIG.
It is sectional drawing which followed II.

FIG. 38 is a cross-sectional view showing another configuration equivalent to that of FIG. 37;

FIG. 39 is a perspective view showing a configuration of a main part in Embodiment 33 of the present invention.

FIG. 40 is a perspective view showing a partial cross section of a superconducting coil housed in an inner vessel container in a conventional superconducting magnet device.

FIG. 41 is a perspective view showing an appearance of the inner tank container in FIG. 40.

FIG. 42 is a partially sectional perspective view showing a schematic configuration of the entire superconducting magnet device.

FIG. 43 is a cross-sectional view illustrating a schematic configuration of a superconducting magnetic levitation vehicle on which a superconducting magnet device is mounted and a track thereof.

FIG. 44 is an explanatory view of a flow path of an eddy current generated on the surface of the inner vessel container. FIG. 44 (A) shows a case caused by a harmonic magnetic field from a ground coil, and FIG. This is a case where the above is caused.

[Explanation of symbols]

1 superconducting coil, 2 inner vessel container, 3 low electric resistance material,
5 Outer tank container, 6,7 Ground coil, 11 High electric resistance part (cut part of low electric resistance material), 12 Superconducting wire (for short circuit), 13 Heater wire, 14 External electric wire, 15
a, 15b Closed circuit, 17 Low electric resistance cover, 17a
Low electric resistance cover (plural), 18 insulating member, 19
Solder connection, 20 Low electric resistance cover, 21 Eddy current, 2
2 Vibration direction, 23 Inner vessel container, 23a Communication hole, 24
Low electric resistance container, 24a predetermined space, 25 upper valve (opening / closing means), 27 low electric resistance container, 27a predetermined space, 28 communication hole, 29 switch, 30 operating rod,
30a opening / closing mechanism, 31 low electric resistance cover, 31a
Superconducting part, 31b stabilizing matrix, 32 superconducting mesh, 32a superconducting wire, 33 superconducting wire, 34
Solder, 35 Low electric resistance cover, 36 Internal stabilizing superconducting wire, 36a Superconducting portion, 36b Stabilizing matrix, 41 Through hole, 42 Magnetic force line, 43 Superconducting portion, 44 Stabilizing material, 45 Magnetic force line, 46 Superconducting wire, 47 Heater Wire, 48 thermometer, 49 electromagnetic force support member, 49a metal part, 50 low electric resistance cover, 5
1 Insulating material, 53 Tension adjusting means.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masao Morita 8-1-1 Tsukaguchi Honcho, Amagasaki City Mitsubishi Electric Corporation Central Research Laboratory (58) Field surveyed (Int.Cl. ⁷ , DB name) H01F 6 / 00 ZAA

Claims (29)

(57) [Claims] 1. A superconducting coil formed by winding a superconducting wire, a superconducting coil immersed in a refrigerant and housed therein, and an inner tank container provided with a low electric resistance material on its surface, and a vacuum insulation of the inner tank container. A superconducting magnet device provided on the vehicle body side facing the ground coil, wherein the inner tank container is partially cut off by the flow path of the eddy current on the surface of the low electric resistance material. A superconducting magnet device characterized in that a high electric resistance portion of the flow path of the eddy current is formed at the cutoff portion. 2. The superconducting magnet device according to claim 1, wherein the high electric resistance portion is provided in a flow path of an eddy current generated on a surface of the inner vessel container during demagnetization of the superconducting coil. 3. The method according to claim 1, wherein the high electric resistance portion is not provided in a flow path of an eddy current generated on a surface of the inner vessel container due to a harmonic fluctuating magnetic field from the ground coil. Superconducting magnet device. 4. The high electric resistance portion is located at a portion other than the flow path of the eddy current generated on the inner tank surface due to the harmonic fluctuating magnetic field from the ground coil and the inner tank surface on the side to which the harmonic fluctuating magnetic field is applied. The superconducting magnet device according to claim 1, wherein the superconducting magnet device is provided in a flow path of an eddy current generated on the surface of the inner tank during excitation and demagnetization of the superconducting coil. 5. The superconducting magnet device according to claim 1, wherein the superconducting wire is used to electrically short-circuit the low electric resistance material across the high electric resistance portion on the inner tank surface. 6. The superconducting magnet device according to claim 5, wherein a heater wire energized from an external power source is provided adjacent to the superconducting wire between the low electric resistance materials. 7. The superconducting magnet according to claim 5, wherein a heater wire is provided adjacent to the superconducting wire between the low electric resistance materials, and an eddy current circuit forming a closed circuit in series with the heater wire is provided. apparatus. 8. The critical current value of the superconducting wire between the low electric resistance materials is lower than the current value generated on the inner tank surface during the demagnetization of the superconducting coil, and is caused by the harmonic fluctuating magnetic field from the ground coil. The superconducting magnet device according to claim 5, wherein the current value is higher than a current value generated on the inner tank surface. 9. A superconducting coil formed by winding a superconducting wire, a superconducting coil immersed in a refrigerant and housed therein, and a low electric resistance material provided on a surface thereof; A superconducting magnet device provided on the vehicle body side facing the ground coil, wherein the inner tank container is partially cut off by the flow path of the eddy current on the surface of the low electric resistance material. A low electric resistance cover that forms a high electric resistance portion of the eddy current flow path at the cutoff portion and is electrically insulated from the inner tank container and the low electric resistance material and covers the high electric resistance portion A superconducting magnet device comprising: 10. A superconducting coil formed by winding a superconducting wire, an inner tank container having the superconducting coil immersed and stored in a refrigerant and provided with a low electric resistance material on its surface, and a vacuum insulation of the inner tank container. A superconducting magnet device provided on the vehicle body side facing the ground coil, wherein the inner tank container is partially cut off by the flow path of the eddy current on the surface of the low electric resistance material. Forming a high electric resistance portion of the flow path of the eddy current at the disconnection portion, and electrically connecting with the low electric resistance material on one side of the disconnection portion, and connecting the low resistance material on the other side of the disconnection portion. A superconducting magnet device comprising: an electric resistance material; and a low electric resistance cover electrically insulated from the high electric resistance part and covering the high electric resistance part. 11. The superconducting magnet device according to claim 9, wherein the low electric resistance cover is formed by a plurality of combinations having an overlapping portion, and the overlapping portion is formed so as to be electrically insulated. 12. A superconducting coil formed by winding a superconducting wire, a superconducting coil immersed in a refrigerant and stored therein, and a low electric resistance material provided on a surface of the superconducting coil. A superconducting magnet device provided on the vehicle body side facing the ground coil, wherein the relative displacement with the outer tank container is large due to the vibration caused by the harmonic fluctuating magnetic field from the ground coil. A superconducting magnet device, wherein a low electric resistance cover is provided so as to cover a position corresponding to the surface portion of the inner tank container. 13. A superconducting coil formed by winding a superconducting wire, an inner vessel container formed by immersing the superconducting coil in a refrigerant and housed and made of a high electric resistance material, and housing the inner vessel vessel by vacuum insulation. In the superconducting magnet device provided on the vehicle body side facing the ground coil, such that the refrigerant flows through the inner tank container through the inner space and covers the inner tank container. The formed low electric resistance container is provided in an upper refrigerant passage communicating with the inside of the low electric resistance container, and the refrigerant passage is operated to be closed during excitation and demagnetization of the superconducting coil and to be opened during application of a harmonic magnetic field. A superconducting magnet device comprising an opening and closing means. 14. A superconducting coil formed by winding a superconducting wire, an inner tank container having the superconducting coil immersed and stored in a refrigerant and provided with a low electric resistance material on its surface, and vacuum insulating the inner tank container. A superconducting magnet device provided on the vehicle body side facing the ground coil, wherein the inner tank container is partially cut off by the flow path of the eddy current on the surface of the low electric resistance material. And forming the high electric resistance portion of the flow path of the eddy current at the disconnection portion, and forming the high electric resistance portion so as to cover the high electric resistance portion and to allow the refrigerant to flow through the inner space into the inner tank container. A low electric resistance container is provided, and an opening / closing means for operating the refrigerant path in the upper refrigerant path communicating with the inside of the low electric resistance container is closed during excitation and demagnetization of the superconducting coil and is open during application of a harmonic magnetic field. Superconducting magnet characterized by having Stone equipment. 15. A superconducting coil formed by winding a superconducting wire, an inner tank container having the superconducting coil immersed and stored in a refrigerant and provided with a low electric resistance material on its surface, and vacuum insulating the inner tank container. A superconducting magnet device provided on the vehicle body side facing the ground coil, wherein the inner tank container is partially cut off by the flow path of the eddy current on the surface of the low electric resistance material. An electric switch for forming a high electric resistance portion of the flow path of the eddy current at the disconnection portion and short-circuiting the high electric resistance portion operable from the outside to the high electric resistance portion with low electric resistance. A superconducting magnet device, comprising: 16. The superconducting magnet device according to claim 9, wherein a superconducting film or a superconducting plate is attached as a low electric resistance cover. 17. The superconducting magnet device according to claim 9, wherein a mesh woven with a superconducting wire having no insulating coating is used for the low electric resistance cover. 18. The low electric resistance cover is formed by attaching a superconducting wire to an edge thereof.
13. The superconducting magnet device according to any one of claims to 12. 19. The superconducting magnet device according to claim 17, wherein an internally stabilized superconducting wire is used as the superconducting wire. 20. The superconducting magnet device according to claim 9, wherein the superconducting film or the superconducting plate has a plurality of through holes as the low electric resistance cover. 21. The superconducting magnet device according to claim 17, wherein the mesh knitted with the superconducting wires is rolled. 22. The superconducting magnet device according to claim 21, wherein the mesh is annealed at a heat treatment temperature of 400 ° C. or less after rolling. 23. A surface of the low electric resistance cover facing the line of external magnetic force, the end of which is rounded so that a magnetic field component in a direction perpendicular to the surface is not generated. 3. The superconducting magnet device according to 1. 24. The stabilizing material at the end portion of the surface of the low electric resistance cover facing the external magnetic line of force is increased so that the critical current density at the end portion is smaller than that near the center. The superconducting magnet device according to any one of claims 16, 17, and 24. 25. A superconducting coil formed by winding a superconducting wire, an inner tank container having the superconducting coil immersed and stored in a refrigerant and provided with a low electric resistance material on its surface, and vacuum insulating the inner tank container. A superconducting magnet device provided on the vehicle body side facing the ground coil, wherein the inner tank container is partially cut off by the flow path of the eddy current on the surface of the low electric resistance material. A high electric resistance portion of the flow path of the eddy current is formed at the cutoff portion, and a superconducting wire or a superconducting wire having a high electric resistance matrix attached in parallel with the cutout portion has a low electric resistance cover. And a heater wire attached to the superconductor or the superconducting wire. 26. The superconducting magnet device according to claim 25, further comprising a thermometer near the heater wire. 27. A superconducting coil formed by winding a superconducting wire, an inner tank container having the superconducting coil immersed and stored in a refrigerant and having a low electric resistance material provided on a surface thereof, and a vacuum insulation of the inner tank container. A superconducting magnet device provided on the vehicle body facing the ground coil, wherein the inner tank container is an electromagnetic force supporting member for preventing the inner tank container from being deformed by electromagnetic force. A part of the overcurrent flow path on the surface has a cut-off portion of the low electric resistance material, which forms a high electric resistance portion, and one or both ends are electrically insulated from the electromagnetic force support member. And a low electrical resistance cover for covering the high electrical resistance portion. 28. A superconducting coil formed by winding a superconducting wire, an inner tank container having the superconducting coil immersed and stored in a refrigerant and provided with a low electric resistance material on its surface, and a vacuum insulation of the inner tank container. A superconducting magnet device provided on the vehicle body side facing the ground coil, wherein an electromagnetic force supporting member for preventing the inner tank container from being deformed by an electromagnetic force is an electrically insulating material. A superconducting magnet device characterized in that the superconducting magnet device is formed so as to be sandwiched in the middle. 29. The apparatus according to claim 28, further comprising means for adjusting a pulling force in a supporting direction of the electromagnetic force supporting member.
3. The superconducting magnet device according to 1.