JPH08172013A - Superconducting coil, its manufacture, and superconducting wire - Google Patents

Abstract

PURPOSE: To provide a superconducting coil which can suppress the occurrence of quenching and normal conduction transitions. CONSTITUTION: A winding section 4 is formed by winding a superconducting wire 12 coated with an insulator around a bobbin while the wire 13 is tensed and the contact surface pressure between the winding section 4 and bobbin is lowered by making an adhesive resin 14 to permeate the space between the wire 13 and heat-treating the resin 14 so as to sufficiently suppress the occurrence of normal conduction transitions. At the time of forming the winding section 4 by forming an insulated superconducting wire by coating the wire 13 with the insulator and winding the insulated superconducting wire around the bobbin while the insulated superconducting wire is treated with tension the occurrence of delamination is suppressed by increasing the residual compressive stress by providing obtuse voids between the curved surfaces of adjacent wires by making the winding tension applied to outer layer stronger than that applied to inner layers and the occurrence of cracks and frictional heat is prevented by reducing the thermal stress applied to the fused material between the curved surfaces of adjacent wires.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a superconducting coil used in a nuclear fusion apparatus, a magnetic resonance imaging apparatus, a magnetic levitation train, etc., and particularly to a normal conducting state by making it difficult to generate frictional heat when energized. TECHNICAL FIELD The present invention relates to a superconducting coil in which the transition of the above is suppressed and a manufacturing method thereof.

[0002]

2. Description of the Related Art Generally, there is known a superconducting coil in which a winding portion is formed by winding a superconducting wire around the outer circumference of a metal winding frame (Japanese Patent Publication No. 63-62084). The structure of this conventional superconducting coil will be described below with reference to FIG.

FIG. 1 shows a conventional superconducting solenoid coil partially cut away. In FIG. 1, the superconducting coil 1
Has a winding frame 2 around which the superconducting wire 4 is wound. The winding frame 2 is composed of a cylindrical winding frame body 2a and annular winding frame flanges 2b provided at both ends thereof.

The outer circumference of the bobbin 2, that is, the outer peripheral surface of the bobbin trunk 2a and the surfaces of the bobbin flange 2b that face each other are covered with a body ground insulation 3a and a flange ground insulation 3b, respectively. . A winding portion 4 formed of a superconducting wire wound in a plurality of rows and a plurality of layers is formed on the outer periphery of the winding frame 2 with the ground insulating material 3 interposed therebetween.

The reel 2 is made of aluminum or aluminum alloy. A polytetrafluoroethylene film (not shown) having a small friction coefficient may be disposed between the winding frame 2 and the winding portion 4. The winding frame 2 may be made of stainless steel or the like, and the winding portion 4 may be impregnated with epoxy resin to bond the winding.

However, in the above-described conventional superconducting coil, friction may occur between the bobbin and the winding portion during the superconducting state, and the frictional heat may cause a transition to the normal conducting state.

In response to such a situation, there is a conventional superconducting coil in which a frictional heat suppressing material having a small friction coefficient is provided between the winding frame and the winding portion. However, when the contact surface pressure between the winding frame and the winding portion is high, the frictional force becomes large and the transition to the normal conducting state due to frictional heat cannot be sufficiently suppressed.

A so-called fusion-bonded superconducting coil is known as a superconducting coil. This known fusion-bonded superconducting coil will be described with reference to FIGS. 1 to 3.

A partial cross section of a known fusion-bonded superconducting coil is as shown in FIG.

FIG. 2 shows a vertical cross section of a part of the winding portion 4 in FIG. The winding portion 4 is formed by winding the fusion-bonded superconducting wire 6 into a plurality of rows and a plurality of layers while applying a constant tension thereto, and then applying heat treatment. The fusion-bonding superconducting wire 6 itself is composed of the insulating superconducting wire 5 and the fusion-bonding material 6a coated thereon. Further, the adjacent fusion-bonded superconducting wires 6 are adhered to each other by a fusion-bonding material 6a.
The insulated superconducting wire 5 is composed of a rectangular superconducting wire 5a and an insulating material 5b covered with the superconducting wire 5a. The surfaces of the four corners of the cross section of the superconducting wire 5a are formed as curved portions 5c. The space between the adjacent curved surface portions 5c is substantially filled with the fusion material 6a so that no cavity is formed.

FIG. 3 shows a fusion-bonded superconducting wire 6 before heat treatment.
FIG. As shown in the figure, the fusion bonding material 6a covers the entire surface of the insulating superconducting wire 5 before the heat treatment.

[0012]

In the conventional fusion-bonded superconducting coil, there is a tendency that delamination easily occurs between adjacent fusion-bonded superconducting wires due to electromagnetic force or thermal stress. There is a tendency that cracks due to thermal stress are likely to occur, and friction due to electromagnetic force or thermal stress is likely to occur on the contact surface between the winding portion 3 and the body ground insulating material 2a. When such peeling, cracking, or friction occurs, heat is generated in the generation portion thereof, and therefore there is a concern that it may induce a fatal quenching in the superconducting coil.

A first object of the present invention is to provide a method of manufacturing a superconducting coil which can suppress the occurrence of quench by reducing the amount of heat generated by the above-mentioned peeling, cracking and friction.

A second object of the present invention is to provide a superconducting coil in which the contact surface pressure between the winding frame and the winding portion is lowered to sufficiently suppress the transition to the normal conducting state.

[0015]

According to the superconducting coil of the present invention, a material having a longitudinal elastic modulus of 50 (GPa) or more and a thermal shrinkage ratio of 0.35% or more between room temperature and temperature 77 (K). A winding frame made of, a superconducting wire coated with an insulating material, and a winding part formed by winding a superconducting wire coated with an insulating material on the outer periphery of the winding frame while applying tension, A superconducting coil is provided which is characterized in that an adhesive material is impregnated between the superconducting wires and the adhesive material is hardened by heat treatment, and a contact surface pressure between the winding portion and the winding frame is reduced. It

In such a superconducting coil, after the superconducting wire is wound around the winding frame, heat treatment is performed on the winding frame and the winding portion. This superconducting coil has a winding frame with a longitudinal elastic modulus of 50 (GPa).
Above, the heat shrinkage ratio between room temperature and temperature 77 (K) is 0.35%
Since it is made of the above materials, the thermal expansion coefficient and the thermal contraction rate of the winding frame are larger than those of the winding part, and the winding frame spreads the winding part radially outward at the high temperature during the heat treatment, and the heat treatment is completed. When it is cooled down, it shrinks more than the winding part.

Due to the difference between the coefficient of thermal expansion and the coefficient of thermal contraction, the winding portion hardens the adhesive material in a state where it is densely compressed from the inside by the winding frame at a high temperature, and is completely inward in the radial direction when cooled. Does not return. As a result, the contact surface pressure between the winding frame and the winding portion is lower than that when the superconducting wire is wound.

Furthermore, when using this superconducting coil,
Since the temperature of the superconducting coil further decreases to an extremely low temperature, the winding frame shrinks more than the winding portion, the contact surface pressure further decreases, and the generation of frictional heat can be sufficiently suppressed.

According to the superconducting coil of the present invention, the winding portion is formed by winding a plurality of layers of the superconducting wire around the winding frame, and the winding tension of the outer layer portion is made larger than that of the inner layer portion of the winding portion. There is. As a result, the inner portion of the winding portion of the superconducting coil is relatively sparsely wound, and the inner layer portion of the winding is compressed at the high temperature of heat treatment, and the inner portion in contact with the winding frame is easily expanded. The contact surface pressure between the winding frame and the winding portion can be reduced.

According to the superconducting coil of the present invention, the superconducting wire is covered with the enamel and the maximum temperature of the heat treatment is set higher than the glass transition temperature of the enamel, so that the enamel softens at the maximum temperature of the heat treatment. It is compressed so that the layers of the superconducting wire become dense. As a result, the contact surface pressure between the winding frame and the winding portion decreases, and the transition of the superconducting coil to the normal conducting state due to frictional heat can be sufficiently suppressed.

According to the superconducting coil of the present invention, the relationship between the thickness d (mm) of the bobbin body and the winding tension F (N) of the superconducting wire in the inner layer of the winding close to the bobbin body is shown. By setting d> F / 10, the rigidity of the reel frame portion is relatively high. With this, when the superconducting wire is wound, the initial shrinkage of the winding barrel body is small, and the inner portion of the winding portion can be effectively expanded by heat treatment.

According to the superconducting coil of the present invention, the relation between the thickness d (mm) and the length L (mm) of the winding barrel body is expressed as d> L / 2.
By setting to 0, the rigidity of the reel body is high, and the initial shrinkage of the reel body portion during winding of the superconducting wire is small. As a result, the inner portion of the winding portion can be effectively expanded by the winding frame having high rigidity during heat treatment.

According to the superconducting coil of the present invention, the reinforcing member is provided on the reel body, and the reinforcing member is made of the material having the same physical properties as the reel. By providing this reinforcing member, the rigidity of the bobbin trunk becomes high, the initial shrinkage of the bobbin trunk during superconducting wire winding is small, and the inner part of the winding section can be effectively expanded during heat treatment. You can

According to the superconducting coil of the present invention, when the current is increased to the rated value, the strain of the reel body is
The winding frame and the winding portion are configured so as to be 20 × 10 ⁻⁶ or less. In this way, by controlling the strain of the bobbin body at the rated current, the contact surface pressure between the bobbin and the winding part is eventually managed, and the transition to the normal conducting state due to friction heat is highly likely. Can be prevented.

Further, according to the method for manufacturing a superconducting coil of the present invention, the insulated superconducting wire or the fused superconducting wire obtained by coating the insulating superconducting wire with the fusion material is applied to the winding frame in a plurality of rows and a plurality of layers. In the method for manufacturing a superconducting coil in which the winding portion is wound to form a winding portion, the winding tension of the insulated superconducting wire is increased from the intermediate layer to the outer layer, which is farther from the winding frame than the inner layer close to the winding frame.

In this structure, when the superconducting coil is excited, the inner layer of the coil is expanded in the radial direction by the action of the electromagnetic force, and the coil layers are pressed against each other. Therefore, large friction and peeling between the coil layers are unlikely to occur, and quenching can be suppressed.

According to the present invention, when the surfaces of at least the four corners of the fusion superconducting wire are formed as curved surface portions and cavities with non-acute angles are formed between the curved surface portions, the fusion material in contact with the cavities can be easily formed. Since it can be contracted or expanded, it is possible to suppress the occurrence of peeling or cracking of the winding portion due to electromagnetic force when the coil is excited.

According to the present invention, the tightening device is attached to the winding portion, and while the heat treatment is applied to the winding portion, the winding portion is prevented from being deformed inward, and substantially in the winding direction of the fusion superconducting wire. After tightening in the vertical direction and applying heat treatment, the tightening device is removed from the winding part.Since the inner layer of the winding part is solidified in the radial direction, the winding part and the winding barrel When the superconducting coil is cooled to a cryogenic temperature, it is completely floated between the winding part and the bobbin body due to the difference in thermal expansion coefficient. Therefore, the rigidity of the winding portion in the axial direction can be increased, which can contribute to the suppression of quenching.

According to the present invention, a mold releasing material having a low friction coefficient is interposed between the winding portion and the winding frame before winding the fused superconducting wire around the winding frame to form the winding portion. The amount of heat generated due to friction or peeling between the winding portion and the winding frame body portion can be reduced, the occurrence of quenching can be suppressed, and a large current can be stably supplied.

According to the present invention, the insulating superconducting wire is coated with the fusing material to form a fusing superconducting wire, and the fusing material is heat-treated while being wound in a plurality of rows and a plurality of layers on the winding frame. In addition,
The winding part is formed while melting the fusion material, and the fusion material is solidified so as to bond the adjacent fusion superconducting wires to each other, so that the fusion material melts when the superconducting wire is wound. Then, the insulated superconducting wires are directly contacted with each other between the layers of the winding portion. Therefore, the rigidity of the winding portion in the layer direction, that is, the radial direction, can be improved, and the displacement of the winding portion due to the heat treatment can be reduced to contribute to the suppression of the occurrence of quench.

According to the present invention, a superconducting wire having a circular cross section is coated with an insulating material to form an insulating superconducting wire. The insulating superconducting wire is coated with a fusion material, and then a part of the fusion material is removed. ,
Alternatively, a fusion superconducting wire formed by molding a fusion material is provided. This fused superconducting wire is a superconducting wire having a circular cross section coated with an insulating material to form an insulating superconducting wire, and after covering the insulating superconducting wire with a fusing material, a part of the fusing material is removed, or In a method for manufacturing a fusion-bonded superconducting wire for manufacturing a fusion-bonded superconducting wire formed by molding a bonding material, an insulating material and a fusion-bonding material are previously integrated into a fusion-bonded insulation material, and then a fusion-bonded insulation material Even if the superconducting wire is coated with a superconducting wire, a superconducting wire with a rectangular cross section is covered with an insulating material to form an insulating superconducting wire. In the method for manufacturing a fusion-bonded superconducting wire for manufacturing a fusion-bonded superconducting wire, characterized in that the thickness of the fusion-bonded material on the flat surface part is smaller or 0 compared to the thickness of other flat surface parts. The fusion material is integrated in advance to form the insulation material with the fusion material, and then the insulation with the fusion material is removed. Material may be coated on the superconducting line.

According to the present invention, it is possible to provide a fusion-bonded superconducting wire suitable for manufacturing a superconducting coil capable of suppressing the occurrence of quenching due to heat generation due to peeling, cracking, or friction.

[0033]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings. In the following description, the overall structure of the superconducting coil is the same as that of the conventional superconducting coil in FIG. 1, and therefore the same parts are denoted by the same reference numerals as those in FIG. 1 and the description thereof is omitted. (Embodiment 1) FIG. 1 is an enlarged view of a cross section of a superconducting coil according to a first embodiment of the present invention in the vicinity of a winding barrel.

In the superconducting coil 10 of this embodiment, the winding frame 2 is made of aluminum alloy A5056B.
The aluminum alloy A5056B has a longitudinal elastic modulus of 80 (GPa) and a thermal shrinkage ratio between room temperature and temperature of 77 (K) of 0.4%. The outer peripheral surface of the reel body portion 2 a is covered with the ground insulator 3.

On the outside of this ground insulator 3, silicone resin, fluororesin, or paraffin having releasability as a frictional heat suppressing material 11 is applied to a thickness of 10 μm or less.
It is hardened. The frictional heat suppressing material 11 is finished by being strongly rubbed with a spatula or the like or hardened with sandpaper or the like until the surface becomes flat after curing. As another type of frictional heat suppressing material 11, sheet-shaped polytetrafluoroethylene may be adhered to the outside of the ground insulator 3.

A winding portion 4 is formed on the outer side of the frictional heat suppressing material 11. The winding portion 4 is wound around the winding frame 2 in a plurality of rows and a plurality of layers while applying tension to the superconducting wire 13 coated with the enamel 12, and then the superconducting wire 13 is impregnated with vacuum pressure. The adhesive resin 14 is impregnated and cured by the method.

The enamel-coated superconducting wire of this embodiment is
It has a flat square cross section. The type of enamel 12 is polyvinyl formal having a glass transition temperature of 110 ° C to 120 ° C. The adhesive resin 14 is a thermosetting epoxy resin.

After winding the superconducting wire 13, heat treatment is applied to the superconducting coil 10. This heat treatment hardens the adhesive resin 14, and also causes the winding barrel body 2a and the winding portion 4 to be cured.
It is performed for the purpose of reducing the contact surface pressure between. In the present embodiment, the superconducting coil 10 is entirely heat-treated at 80 ° C. for 15 hours and then at 130 ° C. for 10 hours.

Further, the winding frame 2 of the superconducting coil 10 of the present embodiment has a relatively high rigidity relative to the winding tension of the conducting wire so that the initial shrinkage becomes small when the superconducting wire 13 is wound. Is configured.

FIG. 2 shows a superconducting coil 10 of this embodiment.
Only the reel 2 is shown. The winding frame 2 has a cylindrical winding frame body 2a, and a brim-shaped winding frame brim 2b at both ends thereof.
have. In order to increase the rigidity, the reel body 2a of the main reel 2 has a relationship between the thickness d and the length L of d> L / 20.
I have to. Specifically, in the present embodiment, the thickness d of the winding barrel body 2a is 10 mm and the length L is 120 mm.

In order to increase the rigidity of the bobbin 2 against the winding tension of the superconducting wire 13, the thickness d (m
m) to the winding tension F (N) of the superconducting wire 13,
The inner layer portion of the winding is set to d> F / 10. Specifically, the enamel superconducting wires 12, 13 of the present embodiment
The winding tension of is set to 60 (N) for the inner layer portion of the winding which occupies approximately 1/3 of the thickness of the winding portion 4 near the winding body portion 2a. The outer layer portion of the winding, which occupies 2/3 of the thickness of the remaining winding portion 4, is 90 (N).

Next, the operation of superconducting coil 10 of the present embodiment having the above structure will be described below with reference to FIG. The change of the superconducting coil 10 before the heat treatment (left side) and after the heat treatment (right side) is shown by a part of the superconducting coil 10 (one side with respect to the center line). In this superconducting coil 10, the winding frame 2 is made of a material having a longitudinal elastic modulus of 50 (GPa) or more, and the thickness d of the winding frame body 2a is d> F with respect to the winding tension F of the winding inner layer. / 10 and reel body 2
For the thickness d of a, the length L of the reel body 2a is d> L
By shortening to / 20, the relative rigidity of the winding frame 2 with respect to the winding tension F of the superconducting wire 13 is increased. For this reason, when the superconducting wire 13 is wound, the winding frame body portion 2a does not significantly contract inward in the radial direction.

Since the winding frame 2 is made of a material having a heat shrinkage ratio of 0.35% or more between the room temperature and the temperature of 77 (K), the winding frame 2 is more The coefficient of thermal expansion and the coefficient of thermal contraction are large. Therefore, during the heat treatment at a temperature of 80 ° C., the contracted winding barrel body 2 a pushes the winding portion 4 outward in the radial direction via the ground insulating material 3.
Further, since the winding tension F of the superconducting wire 13 in the winding inner layer portion of the winding portion 4 is made small, the loosely wound winding inner layer portion is densely packed from the inside by the winding frame body portion 2a before the heat treatment. Compressed,
The central part is expanded. During this time, adhesive resin 1
The curing reaction of No. 4 proceeds.

Next, during the heat treatment at a temperature of 130 ° C., the reel body 2a further pushes the winding portion 4 outward in the radial direction. At this time, the heat treatment temperature (130 ° C.) is the glass transition temperature (110 ° C. to 120 ° C.) of the enamel 12.
, The enamel 12 softens and the superconducting wire 1
It is deformed by the winding tension F of 3 and becomes a dense state in which the layers of the winding part 4 are clogged. Meanwhile, the curing reaction of the adhesive resin 14 is completed.

When the superconducting coil 10 is returned to room temperature after the heat treatment is finished, the inner layer portion of the winding portion 4 is not fully returned inward in the radial direction while being densely compressed. For this reason,
As shown on the left side of FIG. 3, the contact surface pressure σr between the winding frame body 2a and the winding portion 4, which was large before the heat treatment, decreases as shown on the right side of FIG.

Furthermore, when the temperature of the superconducting coil 1 is lowered to an extremely low temperature during use, the winding frame 2 shrinks more than the winding portion 4, and the space between the winding portion 4 and the winding barrel portion 2a is reduced. As a result, the contact surface pressure σr becomes almost zero. As a result, it is possible to prevent the generation of frictional heat between the winding portion 4 and the winding barrel body 2a, and to suppress the transition to the normal conducting state.

FIG. 4 shows a comparison of training characteristics between the superconducting coil 10 and the conventional superconducting solenoid coil. As is clear from FIG. 4, the quenching current of the superconducting coil of the present invention is high and stable as compared with the conventional superconducting solenoid coil. (Embodiment 2) FIG. 5 shows a winding frame of a superconducting coil according to a second embodiment of the present invention with a part thereof cut away. The winding frame 15 is composed of a cylindrical winding frame body portion 15a and brim-shaped winding frame collar portions 15b at both ends thereof, and a brim-shaped reinforcing member 16 is provided at a central portion of the winding frame body portion 15a. The bobbin collar portion 15b and the reinforcing member 16 are welded or integrally formed with the bobbin barrel portion 15a. The reel body 15a of the present embodiment is made of aluminum alloy A5056B (JIS), and the reel flange portion 15b and the reinforcing member 16 are made of aluminum alloy A5052 (JIS).

According to the reel 15 of this embodiment, the rigidity of the reel barrel 15a can be improved by providing the reinforcing member 16 at the center of the reel barrel 15a.
Further, since the reinforcing member 16 is formed of a material substantially similar to that of the winding frame barrel portion 15a having a larger coefficient of thermal expansion and thermal contraction than that of the winding portion 4 (not shown), the temperature is increased / decreased during heating. The reinforcing member 16 expands and contracts greatly with the reel body portion 15a, and the contact surface pressure σ between the reel body portion 15a and the winding portion 4 is increased.
It is possible to reduce r. As a result, the superconducting coil of the present embodiment has a higher quench current and is more stable than the conventional superconducting solenoid coil.

As described above, the main part of the present invention is to reduce the contact surface pressure between the reel body and the winding portion, but the strain of the reel body at the rated current is controlled. This makes it possible to indirectly reduce the contact surface pressure.

FIG. 6 is a graph comparing the superconducting coil of the present invention with the conventional superconducting coil as seen from the distortion of the bobbin barrel portion at this rated current. In the graph of FIG. 6, the horizontal axis represents the current I, and the vertical axis represents the strain εθ of the reel body. The strain εθ of the reel body is measured by applying strain gauges to the inner surface of the reel body at a plurality of points on the inner surface of the reel body, and the strain in the circumferential direction (θ direction) is maximized when the current I rises. Let the value be that value.

Reducing the contact surface pressure σr between the winding portion and the bobbin trunk means reducing the compression of the bobbin trunk inward in the radial direction. The winding barrel body strain εθ when the current I is increased is reduced.
In other words, suppressing the strain εθ of the winding barrel body at the rated current to a predetermined value or less is the same value as reducing the contact surface pressure σr between the winding portion and the winding barrel body portion.

Based on this, the superconducting coil of this embodiment has a strain ε when the current I is increased to the rated value.
The material or rigidity of the bobbin, the winding tension of the superconducting wire, the heat treatment method, etc. were adjusted so that θ was 20 × 10 ⁻⁶ or less. The superconducting coil in which the winding barrel distortion εθ at the rated current according to the present embodiment is suppressed to a predetermined value or less,
It can be seen that the quench current is high and stable.

The present invention is not limited to the embodiments described above without departing from the gist of the present invention. That is, the bobbin trunk and the bobbin collar need not be cylindrical or annular, but may be racetrack or D-shaped, for example. Further, instead of the enamel-coated superconducting wire, a self-fusing enamel superconducting wire can be used, and the use of an adhesive resin can be omitted. Further, a polyimide adhesive tape or a prepreg glass tape can be used instead of the enamel, and the use of an adhesive resin can be omitted. Further, the outer peripheral surface of the ground insulating material is polished in advance, and the polished smooth surface can be regarded as the frictional heat suppressing material.

As is clear from the above description, according to the superconducting coil of the present invention, the longitudinal elastic modulus is 50 (GPa) or more, and the thermal shrinkage ratio between room temperature and temperature 77 (K) is 0.35% or more. Since the winding frame is made of a material, the thermal expansion coefficient and the thermal contraction rate of the winding frame are larger than that of the winding portion, and the winding barrel body can expand the inside of the winding portion through heat treatment.

Further, when the superconducting coil is used, the temperature drops to an extremely low temperature, so that the winding barrel body shrinks and the contact surface pressure with the winding portion can be further reduced.

As a result, when the superconducting coil is used, the contact surface pressure between the winding portion and the winding barrel can be made almost zero, and the transition of the superconducting coil to the normal conducting state due to frictional heat can be effectively prevented. It is possible to provide a superconducting coil. (Embodiment 3) A third embodiment of the present invention will be described with reference to FIGS. FIG. 7 shows a partial cross section of a winding portion 7 constructed according to the third embodiment. The winding portion 20 is configured by winding the fusion superconducting wire 23 in a plurality of rows and a plurality of layers, performing heat treatment in a tightened state as described later, and then returning to room temperature. The lower side of the figure is the reel body 2a not shown here.
It is an inner layer close to (see FIG. 1), and the upper side is an outer layer distant from the reel body 2a. The vertical direction in FIG. 7 is the layer direction, and the horizontal direction is the column direction. In FIG. 7, an interlayer gap 24 and a row gap 25 are shown. The fusion superconducting wire 23 is composed of an insulating superconducting wire 21 and a fusion material 22.

The insulated superconducting wire 21 is composed of a superconducting wire 21a having a rectangular cross section and an insulating material 21b covering the superconducting wire 21a having a substantially uniform thickness. The insulating material 21b is made of, for example, formal resin or polyimide tape. The fusing material 22 is made of, for example, a phenoxy resin, a semi-cured epoxy resin, or a hot melt adhesive. The fusion material 22 is coated on the insulated superconducting wire 21 as described later. The fusing material 22 is in a solidified state by returning to room temperature after being melted by a heat treatment after winding or by a hardening action during the heat treatment. Therefore, the space between the adjacent fusion-bonded superconducting wires 23 is the fusion-bonding material 22.
It is glued in.

The surfaces of the four corners of the cross section of the superconducting wire 21a are formed as curved surface portions 21c with roundness, and the other surfaces are the flat surface portion 21d on the side of the interlayer gap 24 and the space between rows 2.
It is configured as a flat portion 21e on the fifth side. Curved surface 21
The surfaces of the c, the flat surface portion 21d, and the flat surface portion 21e are roughly formed. With such a rough surface, the adhesiveness between the superconducting wire 21a and the insulating material 21b is improved as compared with the case where the surface is smooth. Due to the presence of the curved surface portion 21c, voids are formed between the corner portions of the adjacent insulating superconducting wires 21. However, these voids are not completely filled with the fusion material 22 and some remain as cavities 26. Insulated superconducting wire 2
1. Adjust the initial thickness of the fusing material 22 that coats 1 (FIG. 8).
reference). The presence of the cavity 26 allows the fusing material 22 in contact therewith to easily contract or expand. The thickness between the flat portions 21d on the side of the interlayer gap 24 is 10
It is filled with the fusion material 22 of 0 μm or less. Fusing material 22
Is preformed as described later, and the winding portion 20 is tightened as described later, so that the fusion material 22 does not intervene between the flat surface portions 25e on the inter-row gap 25 side.

When winding the fusion superconducting wire 23, the winding tension is 1.
Increase the size from 1 to 1.5 times and wind. Therefore, the fusion superconducting wire 23 is wound in the inner layer with a relatively smaller winding tension as compared with the outer layer, so that it is easy to spread in the radial direction. Moreover, since the winding portion 20 is solidified in the axial direction (row direction) while being tightened as described later, the fusion superconducting wire 23
The inner layer of is spread in the radial direction.

FIG. 8 shows an enlarged cross section of the cavity 26 and its vicinity in FIG. The heat treatment temperature is the fusion material 2
The viscosity of No. ² when melted is set to about 0.5 to 5 Nsm ^-2 . Therefore, the fusing material 22 gathers in the narrow space between the curved surface portions 5c by the capillary phenomenon and then hardens. Along with this, the corner portion 26a of the cavity 26 is rounded. The stress is lower in the round corner portion 26a than in the sharp corner portion.

FIG. 9 shows a cross section of the fusion superconducting wire 23a after molding and before heat treatment. The outer peripheral portion of the fusion superconducting wire 23a is finished with a dimensional accuracy of ± 10 μm by molding the fusion material 22 described later. A fusion material 22a is coated on the insulating material 21b located on the curved surface portion 21c and the flat surface portion 21d of the insulated superconducting wire 21.
On the other hand, the fusion material 22 is thinly coated or not coated on the insulating material 21b located on the flat surface portion 21e.

FIG. 10 shows a fusion-bonded superconducting wire 23b before molding.
2 shows a cross-sectional structure of FIG. Insulation material 2 at this stage
The fusion material 22b is coated on the 1b so as to have a substantially uniform thickness.

FIG. 11 is a partial perspective view of a fusion superconducting wire and its forming apparatus. This molding apparatus includes a plurality of pairs of heating rollers 30 that rotate in the direction of arrow P. The forming portion 30a of the heating roller 30 is matched with the shapes of the curved surface portion 21c and the flat surface portion 21e of the fusion superconducting wire 23a shown in FIG.
Further, the molding portion 30a is heated to a temperature at which the fusion material 22b in FIG. 10 softens, and presses the curved surface portion 21c and the flat surface portion 21e via the fusion material 22b. The heating roller 30 causes the fusion superconducting wire 23 to run in the direction of the arrow Q in the figure by the rotation thereof, and forms the fusion superconducting wire 23b in the state of FIG. 10 into the fusion superconducting wire 23a in the state of FIG.

FIG. 12 shows a tightening device 40 used for tightening and heat treating the fusion superconducting coil. The fusion superconducting coil is loaded into the heating furnace (not shown) in a state of being attached to the tightening device before the heat treatment. The internal temperature of the heating furnace, that is, the heat treatment temperature is 100 to
The temperature is set to 250 ° C., and the heat treatment is applied to the winding portion 20 of the fusion superconducting coil at this temperature. The upper bobbin flange 2b, the bobbin barrel 2a, and the lower bobbin flange 2b of the fusion superconducting coil are configured to be separable, and the upper bobbin flange 2 is formed.
b can move downward coaxially with respect to the reel body 2a and the lower reel 2b. The tightening device is mainly composed of a pedestal portion 41, a winding frame reinforcing portion 15 located in the center hole of the winding drum body 2a and acting as a reinforcing member for the winding frame when tightening the winding portion 20, and an upper winding frame collar. The winding portion 20 is constituted by a pressing portion 43 for axially pressing the winding portion 20 via the portion 2b as shown by an arrow R.

The pressing portion 43 is pressed downward by a pressing device (not shown). Here, by pressing the winding portion 20 in the axial direction, a tightening force acts in a direction substantially perpendicular to the winding direction of the fusion superconducting wire 23. Reinforcing frame 4
2 is pressed against the inside of the bobbin trunk 2a before winding the fusion superconducting wire 23, and acts so that the bobbin trunk 2a and the winding part 20 are not deformed inward. Further, the winding frame reinforcing portion 42 is made of a material having a larger coefficient of thermal expansion than the winding portion 7, for example, the winding frame 2
It is composed of the same material as aluminum alloy. Therefore, the winding frame reinforcing portion 42 and the winding frame body portion 2a act to spread the inner layer of the winding portion 20 in the radial direction when pressed by the pressing portion 43. The lower reel part 2b is fixed to the pedestal part 41. The terminal 44 of the winding portion 20 is led out from the lower winding frame collar portion 2b, and the terminal 44 is inserted into the hole 45 formed in the pedestal portion 41.

After the winding portion 20 is heated in the tightened state as described above and the fusion material is softened and then returned to room temperature, the tightening device is removed from the winding portion 20. Then, the inner layer of the winding portion 20 is solidified in a state of spreading in the radial direction.
The space between 0 and the bobbin trunk 2a is almost floating. When cooled to a very low temperature to function as a superconducting coil,
The winding portion 20 and the winding frame body portion 2a are completely floated due to the difference in thermal expansion coefficient between them. Moreover, the fusing material 22
Is not covered by the flat surface portion 21e on the side of the row-to-row gap 25 (see FIG. 12), and the winding portion 20 is solidified in the axially pressed state, so that the winding portion 20 is fixed in the axial direction (row direction). The rigidity of

FIG. 13 shows the results of measuring the quench current Iq in the fusion superconducting coil according to the present invention shown in FIG. 7 and the fusion superconducting coil according to the prior art shown in FIG. It can be seen that the fusion superconducting coil according to the present invention has a larger quench current Iq than the prior art. (Embodiment 4) FIG. 14 illustrates a method of treating a fusion superconducting wire 27 according to a fourth embodiment of the present invention. In this embodiment, initially, as shown in the figure, the entire outer peripheral surface of the insulated superconducting wire 21 is coated with the fusion material 22. As shown by the arrow S, the sand 28 is first sprayed from one direction to the flat surface portions 21e and the curved surface portions 21c in the column direction, thereby removing the fusion material 22 of the curved surface portions 21c and the flat surface portions 21e on the one surface side. After this, sand 28 from the side opposite to the arrow S
To remove the fusion material 22 on the curved surface portion 21c and the flat surface portion 21e on the opposite side. The fusion-bonding superconducting wire 27 in which the fusion-bonding material 22 is removed from both surfaces of the flat surface portion 21e is used instead of the fusion-bonding superconducting wire 23a in FIG. The subsequent processing is performed according to the case of the third embodiment. The same operation and effect as in the case of the third embodiment can be obtained also by the fourth embodiment. (Embodiment 5) FIG. 15 shows a fusion superconducting wire 31 according to Embodiment 5. The band-shaped fusing material 32 is pressure-bonded by the heating roller from the curved surface portion 21c to the flat surface portion 21d of the insulated superconducting wire 21. In this way, the fusing material 32
The fusion-bonded superconducting wire 21 of FIG.
By using it instead of a, the same operation and effect as those of the third or fourth embodiment can be obtained. (Sixth Embodiment) FIGS. 16 and 17 show a fusion-bonded superconducting wire according to a sixth embodiment. 16 shows a cross-sectional structure of the fused superconducting wire 33a after molding, and FIG. 17 shows the fused superconducting wire 33b before molding. In FIG. 16, the outer periphery of the curved surface portion 21c of the fusion superconducting wire 33a is finished by the molded fusion material 34a with a dimensional accuracy of ± 10 μm. The fusion material 34a is formed only on the curved surface portion 21c of the insulated superconducting wire 21, and the flat surface portions 21d and 2
It is not formed in 1e.

FIG. 17 shows the fused superconducting wire 33b before being molded.
Is shown. A string-shaped fusion material 34b is pressure-bonded to the curved surface portion 21c of the insulated superconducting wire 21 by a heating roller. The fusing material 34b is obtained by impregnating a glass fiber or aramid fiber thread with an epoxy resin and hardening the epoxy resin in a semi-cured state. Alternatively, a melted phenoxy resin, a hot melt adhesive, or the like may be extruded from the nozzle to the curved surface portion 21c and solidified. When the fusion material 34b is molded with a heating roller, the fusion superconducting wire 33b becomes the fusion superconducting wire 33a. Even if the fusion superconducting wire 33a is used instead of the fusion superconducting wire 23a of FIG. 9, the same operation and effect as those of the first embodiment can be obtained. Moreover, since the fusing material 34a is not formed on the flat surface portion 21e or the flat surface portion 21d, the rigidity of the solidified winding portion is increased in the layer direction as well as in the column direction. (Embodiment 7) FIGS. 18 and 19 show a fused superconducting wire according to Embodiment 5 of the present invention. FIG.
Shows the cross-sectional structure of the winding portion 50, and FIG. 19 shows the cross-sectional structure of the fusion superconducting wire 51a before heat treatment. The winding part 50 of FIG. 18 has a plurality of rows of fusion superconducting wires 51.
After being wound into a plurality of layers, heat-treated in a tightened state, and then returned to room temperature. The lower side of the figure is an inner layer near the unillustrated bobbin trunk 2a, and the upper side is an outer layer distant from the bobbin trunk 2a. The vertical direction in the figure is the layer direction, and the horizontal direction is the column direction. Interlayer gaps 54 and column gaps 55 are also shown in the figure. The fusion superconducting wire 51 is composed of an insulating superconducting wire 52 and a fusion material 53. Adjacent fusion superconducting wires 51 are bonded to each other with a fusion material 53.
The insulated superconducting wire 52 includes a superconducting wire 52a and an insulating material 52b.
The superconducting wire 52a is covered with an insulating material 52b with a uniform thickness.

The cross section of the superconducting wire 52a is circular, and the surface of the superconducting wire 52a is a curved surface portion 52c. The thickness of the fusing material 53 is adjusted so that the curved surface portions 52c are not completely filled with the fusing material 53, and even after the heat treatment of the fusing material 53, cavities 56 are formed between the insulating superconducting wires 52. Are formed. By doing so, the fusing material 53 in contact with the cavity 56 can easily contract and expand. Fusing material 53
Are collected in a narrow space between the curved surface portions 52c by the capillary phenomenon and then hardened. Accordingly, the corners of the cavity 56 are rounded. The rounded corners have lower stress than the sharp corners.

FIG. 19 shows the fused superconducting wire 51a before heat treatment. The fusion superconducting wire 51a is formed by covering the insulation material 52b with the fusion material 53 in a uniform thickness as shown in the figure. Thus, since the insulated superconducting wires 52 are in contact with each other at the inter-column gap 55, the rigidity of the winding portion 50 in the column direction is higher than that in the case where they are not in contact. Even if the cross-sectional shape of the superconducting wire 52a is circular, the corners of the cavity 56 are round. (Embodiment 8) Embodiments other than the above-described embodiment will be described with reference to the drawings already referred to. Even if the fusing material 22 of FIG. 7 is integrated in advance, it is possible to obtain the same operation and effect as those of the third embodiment. For example, a tape in which a phenoxy resin is impregnated into a tape-shaped base material made by weaving glass fibers is manufactured, and this tape is used as the superconducting wire 21.
The fused superconducting wire can be formed by coating a. Alternatively, it is possible to manufacture a tape in which a phenoxy resin is applied to both surfaces of a polyimide tape, and coat the superconducting wire 21a with this tape to form a fused superconducting wire. Superconducting wire 21a
Is a forced cooling conductor, the same operation as in the first embodiment
The effect can be obtained. If a release material having a low coefficient of friction is interposed between the winding portion 7 and the winding frame body portion 1a, the winding portion 2
It is possible to reduce the amount of heat generated due to friction or separation between 0 and the reel body 2a. (Ninth Embodiment) Up to the seventh embodiment, the fusion superconducting wire is wound in a plurality of rows and a plurality of layers and then subjected to heat treatment, but here, as a ninth embodiment, heat treatment is performed while winding. The superconducting coil to be added will be described. By applying heat treatment while winding, the fusion material does not melt at the time of winding, so that the insulating superconducting wires directly contact each other between the layers of the winding portion. Therefore, the rigidity of the winding portion in the layer direction is higher than that in the case where they are not in contact with each other. Further, the displacement of the winding portion due to the heat treatment can be reduced. (Embodiment 10) The fusion superconducting coil has been described up to the seventh embodiment, but here, a superconducting coil using no fusion material will be described. The winding tension of the insulated superconducting wire is increased from the intermediate layer to the outer layer, which is separated from the winding frame, as compared with the inner layer close to the winding frame. By doing so, when the superconducting coil is excited, the electromagnetic force spreads the inner layers in the radial direction and presses the layers. For this reason, it is possible to prevent the occurrence of large friction and peeling between layers.

As described above, in the fusion superconducting coil of the present invention, since the fusion superconducting wire of the inner layer is expanded in the radial direction, compressive stress acts between the layers. Since this compressive stress remains even when thermal stress or electromagnetic force acts between layers, the layers do not largely separate. Since the curved surface portions of the fusion superconducting wire are cavities and the corner portions of the cavities are rounded, the thermal stress acting on the fusion material is reduced, and large cracks do not occur. Since the winding portion and the winding frame body portion are solidified so as to be in a floating state, the frictional heat becomes smaller than that in the case where the winding portion and the winding frame body portion are solidified so as to keep a strong contact. Also, since the winding part is tightened and hardened so that the rigidity is high,
It is not greatly deformed by electromagnetic force, and there is no large friction between the winding part and the body ground insulator. As described above, since it is prevented from being largely generated due to peeling, cracking or friction and the quench current of the fusion superconducting coil is increased, a large current can be stably supplied. Further, since the tightening device is removed after the winding portion is hardened, the fusion superconducting coil can be downsized and the tightening device can be repeatedly used.

[0072]

According to the superconducting coil of the present invention,
After winding the superconducting wire around the winding frame, the winding frame and the winding portion are heat treated. This superconducting coil is made of a material with a longitudinal elastic modulus of 50 (GPa) or more and a thermal shrinkage of 0.35% or more between room temperature and temperature of 77 (K). And the heat shrinkage ratio is larger than those of the winding portion, and the winding frame spreads the winding portion radially outward at a high temperature during the heat treatment,
When it is cooled after finishing the heat treatment, it shrinks more than the winding part.
The contact surface pressure between the winding frame and the winding part is set by hardening the adhesive material in a state of being densely compressed from the inside by the winding frame at a high temperature and not completely returning inward in the radial direction when cooling. Compared with the time of winding the superconducting wire, it becomes possible to prevent the generation of frictional heat, suppress the occurrence of quenching, and sufficiently suppress the transition to the normal conducting state.

A plurality of layers of superconducting wire are wound around the winding frame to form a winding portion, and the winding tension of the outer layer portion is made larger than that of the inner layer portion of the winding portion. As a result, the inner portion of the winding portion of the superconducting coil is relatively sparsely wound, and the inner layer portion of the winding is compressed at the high temperature of heat treatment, and the inner portion in contact with the winding frame is easily expanded. The contact surface pressure between the winding frame and the winding portion can be reduced.

According to the superconducting coil of the present invention, the superconducting wire is covered with the enamel and the maximum temperature of the heat treatment is set higher than the glass transition temperature of the enamel, so that the enamel softens at the maximum temperature of the heat treatment. It is compressed so that the layers of the superconducting wire become dense. As a result, the contact surface pressure between the winding frame and the winding portion decreases, and the transition of the superconducting coil to the normal conducting state due to frictional heat can be sufficiently suppressed.

According to the superconducting coil of the present invention, the relationship between the thickness d (mm) of the bobbin trunk and the winding tension F (N) of the superconducting wire in the inner layer of the winding near the bobbin trunk is shown. By setting d> F / 10, the rigidity of the reel frame portion is relatively high. With this, when the superconducting wire is wound, the initial shrinkage of the winding barrel body is small, and the inner portion of the winding portion can be effectively expanded by heat treatment.

According to the superconducting coil of the present invention, the relationship between the thickness d (mm) and the length L (mm) of the reel body is d> L / 2.
By setting to 0, the rigidity of the reel body is high, and the initial shrinkage of the reel body portion during winding of the superconducting wire is small. As a result, the inner portion of the winding portion can be effectively expanded by the winding frame having high rigidity during heat treatment.

According to the superconducting coil of the present invention, the reinforcing member is provided on the reel body, and the reinforcing member is made of the material having the same physical properties as the reel. By providing this reinforcing member, the rigidity of the bobbin trunk becomes high, the initial shrinkage of the bobbin trunk during superconducting wire winding is small, and the inner part of the winding section can be effectively expanded during heat treatment. You can

According to the superconducting coil of the present invention, when the current is increased to the rated value, the strain of the reel body is
The winding frame and the winding portion are configured so as to be 20 × 10 ⁻⁶ or less. In this way, by controlling the strain of the bobbin body at the rated current, the contact surface pressure between the bobbin and the winding part is eventually managed, and the transition to the normal conducting state due to friction heat is highly likely. Can be prevented.

Further, according to the method of manufacturing a superconducting coil of the present invention, the insulating superconducting wire or the fused superconducting wire obtained by coating the insulating superconducting wire with the fusion material is applied to the winding frame in a plurality of rows and a plurality of layers. In the method of manufacturing a superconducting coil in which the winding portion is wound to form a winding portion, the winding tension of the insulating superconducting wire is increased from the intermediate layer to the outer layer farther from the winding frame than in the inner layer close to the winding frame. When excited,
The inner layer of the coil is expanded in the radial direction by the action of the electromagnetic force, and the coil layers are pressed against each other. Therefore, large friction and peeling between the coil layers are unlikely to occur, and quenching can be suppressed.

Further, since the surfaces of at least the four corners of the fusion superconducting wire are formed as curved surface portions and cavities having non-acute angles are formed between the curved surface portions, the fusion material in contact with the cavities easily contracts. Since it can be expanded or expanded, it is possible to suppress the peeling or cracking of the winding portion due to the electromagnetic force when the coil is excited.

According to the present invention, the tightening device is attached to the winding portion, and while the heat treatment is applied to the winding portion, the winding portion is prevented from being deformed inward, and is substantially aligned with the winding direction of the fusion superconducting wire. After tightening in the vertical direction and applying heat treatment, the tightening device is removed from the winding part.Since the inner layer of the winding part is solidified in the radial direction, the winding part and the winding barrel When the superconducting coil is cooled to a cryogenic temperature, it is completely floated between the winding part and the bobbin body due to the difference in thermal expansion coefficient. Therefore, the rigidity of the winding portion in the axial direction can be increased, which can contribute to the suppression of quenching.

According to the present invention, a mold release material having a low friction coefficient is interposed between the winding portion and the winding frame before the fusion superconducting wire is wound around the winding frame to form the winding portion. The amount of heat generated due to friction or peeling between the winding portion and the winding frame body portion can be reduced, the occurrence of quenching can be suppressed, and a large current can be stably supplied.

According to the present invention, the insulating superconducting wire is coated with the fusion material to form the fusion superconducting wire, and the fusion material is heat-treated while being wound in a plurality of rows and a plurality of layers on the winding frame. In addition,
The winding part is formed while melting the fusion material, and the fusion material is solidified so as to bond the adjacent fusion superconducting wires to each other, so that the fusion material melts when the superconducting wire is wound. Then, the insulated superconducting wires are directly contacted with each other between the layers of the winding portion. Therefore, the rigidity of the winding portion in the layer direction, that is, the radial direction, can be improved, and the displacement of the winding portion due to the heat treatment can be reduced to contribute to the suppression of the occurrence of quench.

According to the present invention, a superconducting wire having a circular cross section is coated with an insulating material to form an insulating superconducting wire. The insulating superconducting wire is coated with a fusion material, and then a part of the fusion material is removed. ,
Alternatively, a fusion superconducting wire formed by molding a fusion material is provided. This fused superconducting wire is a superconducting wire having a circular cross section coated with an insulating material to form an insulating superconducting wire, and after covering the insulating superconducting wire with a fusing material, a part of the fusing material is removed, or A superconducting material with a rectangular cross section, whether it is a molded adhesive material, an insulating material with a fusion material is integrated in advance to form an insulation material with a fusion material, and then the insulation material with a fusion material is covered with a superconducting wire. Even if a wire is coated with an insulating material to form an insulating superconducting wire and the insulating superconducting wire is coated with a fusion material, the thickness of the fusion material of a part of the plane surface of the insulating superconducting wire is not It may be smaller than the above or may be zero, which is suitable for manufacturing a superconducting coil capable of suppressing the occurrence of quenching due to heat generation due to peeling, cracking, or friction.

[Brief description of drawings]

FIG. 1 is an enlarged sectional view showing a contact portion between a winding barrel and a winding portion of a superconducting coil according to a first embodiment of the present invention.

FIG. 2 is a diagram in which only the bobbin of the superconducting coil of the present invention is partially cut and shown.

FIG. 3 is a diagram illustrating a change in contact surface pressure between a winding portion and a winding barrel body before and after heat treatment.

FIG. 4 is a graph showing training characteristics of a superconducting coil of the present invention and a conventional superconducting solenoid coil for comparison.

FIG. 5 is a diagram in which a winding frame of a superconducting coil according to a second embodiment of the present invention provided with a reinforcing member is partially cut and shown.

FIG. 6 is a graph showing a comparison between the superconducting coil of the present invention in which the strain of the winding frame at the rated current is equal to or less than a predetermined value and the strain of the winding frame when the conventional superconducting solenoid coil is energized.

FIG. 7 is a partial sectional view of a winding portion according to a third embodiment of the present invention.

8 is a sectional view of the cavity in FIG. 7 and its vicinity.

9 is a cross-sectional view showing a state after forming the fusion-bonded superconducting wire shown in FIG. 7 and before applying heat treatment.

10 is a cross-sectional view showing a state before forming the fusion-bonded superconducting wire shown in FIG.

FIG. 11 is a partial perspective view of the fusion superconducting wire shown in FIG. 7 and its forming apparatus.

FIG. 12 is a cross-sectional view of the fusion superconducting coil and its tightening device during heat treatment.

13 is an embodiment of the present invention shown in FIG. 7 and FIG.
6 is a graph showing the measurement results of the quench current in the double fusion superconducting coil according to the conventional technique shown in FIG.

FIG. 14 is a sectional view of a fusion superconducting wire according to a fourth embodiment.

FIG. 15 is a sectional view of a fusion superconducting wire according to a fifth embodiment.

FIG. 16 is a sectional view of a fusion superconducting wire according to a sixth embodiment.

FIG. 17 is a cross-sectional view showing a state of the fusion superconducting wire of FIG. 7 before being molded.

FIG. 18 is a partial cross-sectional view of a winding portion according to the seventh embodiment.

FIG. 19 is a cross-sectional view of the fusion-bonded superconducting wire before heat treatment in the winding portion of FIG.

FIG. 20 is a perspective view showing a conventional superconducting coil with a part thereof cut away.

21 is a partial cross-sectional view of the winding portion in FIG.

FIG. 22 is a cross-sectional view of a fusion superconducting wire before heat treatment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 superconducting coil 2 reel 2a reel body 2b reel flange 3a body insulation 3b flange insulation 4 winding 5 insulation superconducting wire 6 fusion welding superconducting wire 11 friction suppressing material 12, 13 superconducting wire 14 Adhesive Resin 15 Winding Frame 16 Reinforcement Member 20 Winding Part 21 Insulating Superconducting Wire 22 Fusing Material 23 Fusion Fusing Superconducting Wire 24 Interlayer Gap 25 Row Gap 26 Cavity 27 Fusing Superconducting Wire 28 Sand 30 Heating Roller 31 Fusing Superconducting Wire 32 Fusing material 33 Fusing superconducting wire 34 Fusing material 40 Tightening device 50 Winding part 51 Superconducting wire 52 Insulating superconducting wire 53 Fusing material 54 Interlayer gap 55 Row gap

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Takahiro Dobashi, Hiroshi Dobashi, 2-4 Suehiro-cho, Tsurumi-ku, Yokohama-shi, Kanagawa Toshiba Keihin Plant, Inc. (72) Akira Tanaka, Suehiro, Tsurumi-ku, Yokohama-shi, Kanagawa 2-4 Machi, Toshiba Keihin Works (72) Inventor Takayuki Kobayashi 2-4 Suehiro-cho, Tsurumi-ku, Yokohama-shi, Kanagawa Toshiba Keihama Works (72) Inventor Mura Iri Yokohama, Kanagawa 2-4 Suehiro-cho, Tsurumi-ku, Toshiba Keihin Plant (72) Inventor Yuki Sekiya 1st, Toshiba-cho, Fuchu-shi, Tokyo Inside the Fuchu factory, Toshiba (72) Inventor, Tamiko Ebisu-cho, Tsurumi, Yokohama, Kanagawa 2-4 Suehiro-cho, ward Inside Keihin Office, Toshiba Corporation (72) Inventor Hisan Mitsui 2-4 Suehiro-cho, Tsurumi-ku, Yokohama-shi, Kanagawa Ground Toshiba Corporation Keihin workplace

Claims (23)

[Claims] 1. A winding frame made of a material having a longitudinal elastic modulus of 50 (GPa) or more and a thermal contraction rate of 0.35% or more between room temperature and a temperature of 77 (K), and a superconducting wire coated with an insulating material. And a winding portion formed by winding a superconducting wire covered with an insulating material while applying tension to the outer periphery of the winding frame, and impregnating an adhesive material between the superconducting wires, A superconducting coil, characterized in that the contact surface pressure between the winding part and the winding frame is reduced while the adhesive material is cured. 2. The winding portion is formed by winding the superconducting wire so as to form a plurality of layers on the outer periphery of the winding frame, and winding of the superconducting wire in an outer layer portion of the winding portion remote from the winding frame. The superconducting coil according to claim 1, wherein the winding tension is set higher than the winding tension of the superconducting wire in the inner layer portion of the winding portion near the winding frame. 3. The superconducting coil according to claim 1, wherein the superconducting wire is covered with enamel, and the maximum temperature of the heat treatment is set higher than the glass transition temperature of the enamel. 4. The bobbin comprises a body and a brim, and the thickness d (mm) of the body of the bobbin and the winding tension F () of the superconducting wire in the inner layer of the winding near the body of the bobbin. The relationship of N) is d> F / 10
The superconducting coil according to claim 1, wherein 5. The bobbin comprises a body and a brim, and the relationship between the thickness d (mm) and the length L (mm) of the bobbin body is expressed as d> L.
The superconducting coil according to claim 1, wherein the superconducting coil is / 20. 6. The bobbin comprises a barrel and a brim, and a reinforcing member is provided on the reel body. The reinforcing member has a longitudinal elastic modulus of 50 (GPa) or more, room temperature and temperature of 77 (K). The superconducting coil according to claim 1, wherein the superconducting coil is formed of a material having a heat shrinkage ratio of 0.35% or more. 7. The winding frame and the winding portion are configured such that the strain of the winding barrel body when the current is increased to a rated value is 20 × 10 ⁻⁶ or less. 1. The superconducting coil according to 1. 8. A method for manufacturing a superconducting coil, wherein an insulating superconducting wire is wound in a plurality of rows and a plurality of layers on a winding frame while applying a tension to the winding to form a winding portion, which is farther from the winding frame than an inner layer close to the winding frame. A method for manufacturing a superconducting coil, characterized in that the winding tension of the insulated superconducting wire is increased from the intermediate layer to the outer layer. 9. An insulating superconducting wire is coated with a fusion material to obtain a fusion superconducting wire, and the fusion superconducting wire is wound in a plurality of rows and a plurality of layers on a winding frame while applying tension thereto to form a winding portion. 9. The method for manufacturing a superconducting coil according to claim 8, wherein the fusion material is subjected to heat treatment to be melted, and then the fusion material is hardened to bond adjacent fusion superconducting wires to each other. 10. The method for producing a superconducting coil according to claim 9, wherein the surfaces of at least the four corners of the fusion-bonded superconducting wire are formed as curved portions, and cavities having non-acute angles are formed between the curved portions. . 11. A tightening device is attached to the winding portion, and while heat treatment is applied to the winding portion, the winding portion is prevented from being deformed inward, and is in a direction substantially perpendicular to the winding direction of the fusion superconducting wire. Tightening,
The method for manufacturing a superconducting coil according to claim 9, wherein the tightening device is removed from the winding portion after the heat treatment is applied. 12. A mold release material having a low coefficient of friction is interposed between the winding part and the winding frame prior to forming the winding part by winding the fusion superconducting wire on the winding frame. Item 10. A method for manufacturing the fusion superconducting coil according to Item 9. 13. A superconducting wire having a circular cross section is coated with an insulating material to form an insulating superconducting wire, and the insulating superconducting wire is coated with a fusing material, and then a part of the fusing material is removed or a fusing material is used. Is formed into a fusion-bonded superconducting wire, and the fusion-bonded superconducting wire is wound in a plurality of rows and a plurality of layers on a winding frame while applying tension to the winding to form a winding portion, and the fusion material is melted by heat treatment. 9. The method for producing a superconducting coil according to claim 8, further comprising hardening a fusion material and adhering the adjacent fusion superconducting wires to each other. 14. A fused superconducting wire in which an insulating material is coated on a superconducting wire having a rectangular cross section to form an insulating superconducting wire, and the insulating superconducting wire is coated with a fusion material. A fusion-bonding superconducting wire characterized in that the thickness of the fusion-bonding material is made smaller or 0 compared to the thickness of other flat portions, and the fusion-bonding superconducting wire is applied to the winding frame in a plurality of rows while applying tension thereto.
A winding part is formed by winding in a plurality of layers, heat treatment is applied to the fusing material to melt it, and then the fusing material is solidified to bond adjacent fusion superconducting wires to each other. 8. The method for manufacturing a superconducting coil according to item 8. 15. A fused superconducting wire in which a superconducting wire having a rectangular cross section is covered with an insulating material to form an insulating superconducting wire, and a band-shaped or string-like fusion material is pressure-bonded to a part of the surface of the insulating superconducting wire. While applying tension to this fusion superconducting wire, it is wound in multiple rows and multiple layers on the winding frame to form a winding portion, and the fusion material is heat-treated and melted, and then the fusion material is solidified and adjacent. 9. The fusion-bonded superconducting wires are bonded to each other.
A method for manufacturing the superconducting coil according to 1. 16. An insulating superconducting wire is coated with a fusing material to obtain a fusing superconducting wire, and the fusing material is subjected to heat treatment by winding the fusing superconducting wire in a plurality of rows and a plurality of layers on a winding frame. A method of manufacturing a superconducting coil, wherein a winding portion is formed while melting a material, the fusion material is hardened, and adjacent fusion superconducting wires are bonded to each other. 17. A release material having a low coefficient of friction is interposed between the winding portion and the winding frame before winding the fused superconducting wire around the winding frame to form the winding portion. Item 17. A method for manufacturing the fusion superconducting coil according to Item 16. 18. A superconducting wire having a circular cross section is coated with an insulating material to form an insulating superconducting wire, and the insulating superconducting wire is covered with a fusion material, and then a part of the fusion material is removed or the fusion material is fused. A fused superconducting wire formed by molding. 19. A superconducting wire having a circular cross section is coated with an insulating material to form an insulating superconducting wire. The insulating superconducting wire is coated with a fusion material, and then a part of the fusion material is removed, or the fusion material is fused. In a method for manufacturing a fusion-bonded superconducting wire for manufacturing a fusion-bonded superconducting wire formed by molding, an insulating material and a fusion-bonding material are previously integrated into a fusion-bonded insulation material, and then the fusion-bonded insulation material is superconductive A method of manufacturing a fusion-bonded superconducting wire, which comprises covering the wire to obtain a fusion-bonded superconducting wire. 20. A fusion-bonded superconducting wire in which a superconducting wire having a rectangular cross section is coated with an insulating material to form an insulating superconducting wire, and the insulating superconducting wire is coated with a fusion material. A fused superconducting wire, characterized in that the thickness of the fused material is made smaller or 0 compared to the thickness of other plane portions. 21. A fused superconducting wire in which a superconducting wire having a rectangular cross section is coated with an insulating material to form an insulating superconducting wire, and the insulating superconducting wire is coated with a fusion material. In the method for manufacturing a fusion superconducting wire for manufacturing a fusion superconducting wire, the insulating material and the fusion material are A method for manufacturing a fusion-bonded superconducting wire, which comprises integrating the fusion-bonded insulating material with a superconducting wire after preliminarily integrating them into a fusion-bonded insulating material. 22. A fused superconducting wire in which a superconducting wire having a rectangular cross section is coated with an insulating material to form an insulating superconducting wire, and a band-shaped or string-shaped fusing material is pressure-bonded to a part of the surface of the insulating superconducting wire. 23. A fused superconducting wire in which a superconducting wire having a rectangular cross section is covered with an insulating material to form an insulating superconducting wire, and a band-shaped or string-shaped fusion material is pressure-bonded to a part of the surface of the insulating superconducting wire. In the method for manufacturing the fusion superconducting wire to be manufactured, after the insulation material and the fusion material are integrated in advance to be the insulation material with the fusion material,
A method for manufacturing a fusion-bonded superconducting wire, which comprises coating an insulating material with a fusion-bonding material on a superconducting wire to obtain a fusion-bonded superconducting wire.