JP6567451B2 - Superconducting coil and superconducting coil manufacturing method - Google Patents

Description

  The present invention relates to a superconducting coil and a method for manufacturing the superconducting coil.

Conventionally, a so-called double pancake-type superconducting coil (hereinafter referred to as a double pancake coil) is formed by winding a tape-shaped superconducting wire around a cylindrical winding frame so as to have two stages in the central axis direction. Are known.
In such a double pancake coil, both ends of the superconducting wire can be arranged on the outer diameter side of the coil, and a so-called single pancake coil is formed by winding the superconducting wire on the winding frame in one stage. In addition, unlike the case where one end of the superconducting wire is disposed on the inner diameter side of the coil, there is an advantage that the space on the inner diameter side of the coil can be used effectively. Moreover, since the inner diameter side of the coil is often exposed to a strong magnetic field environment, there is a risk of quenching, and installing a current terminal part that generates heat in this part is also from the viewpoint of coil stability. It is not preferable. Therefore, it is an advantage of the double pancake coil that the current terminal can be installed on the outer diameter side of the coil.

  In general, the innermost winding of the double pancake coil (referred to as the first winding portion) takes the form as shown in FIG. 10, and a tape-like superconducting wire is wound around the winding frame in a spiral form, and the first winding The upper and lower two-stage pancake coils (referred to as the second winding portion) are formed by winding the both ends of the portion 101 on the outer sides in the radial direction. At this time, since the first winding portion 101 has a spiral shape, the tape-shaped superconducting wire is wound by applying tension while applying edgewise strain (strain in the tape width direction).

However, the tape-shaped superconducting wire is based on a high-strength metal substrate, and allows bending to some extent in the flatwise direction (direction perpendicular to the tape plane) (minimum bending diameter of about 10 mm), but distortion in the edgewise direction is There is a feature that is almost unacceptable.
The edgewise distortion of the first winding portion releases the residual stress after the winding and causes the winding portion to slip off from the winding frame.
Further, when operated as a superconducting coil, depending on the magnetic field environment of the applied system, an electromagnetic force is applied to the tape-shaped superconducting wire in the direction of the central axis of the winding frame, and the influence of edgewise distortion is further increased.

  For this reason, the structure which suppresses edgewise distortion by forming the groove | channel where the inner bottom part inclined in the winding frame, and winding the 1st winding part around the said groove | channel conventionally is proposed (for example, refer patent document 1). ).

JP 2009-212310 A

However, as in Patent Document 1, when the first winding portion 101 is wound with respect to the winding frame 105 in order to reduce the edgewise distortion applied to the tape-shaped superconducting wire, the second winding portion In order to wind the wire 102 in the direction perpendicular to the winding frame, it is necessary to fill the putty as shown in FIG. 11, and when the application of the putty P is not performed precisely, the space between the winding frame and the second winding portion 102 is required. This causes a problem that the second winding portion 102 slides down.
An object of the present invention is to provide a superconducting coil that can reduce the influence of edgewise strain on the tape-shaped superconducting wire and can be easily manufactured, and a method for manufacturing the same.

The invention according to claim 1 is a superconducting coil,
An inner reel,
An outer reel disposed outside the inner reel;
A tape-shaped superconducting wire, a first winding portion spirally wound around the outer periphery of the inner winding frame so as to shift at least one width of the superconducting wire;
A tape-shaped superconducting wire continuous to one end and the other end of the first winding part, and a two-stage second winding part wound around the outer periphery of the outer winding frame;
The outer winding frame includes an opening for passing a tape-shaped superconducting wire continuous to one end and the other end of the first winding portion through the outer periphery.

The invention according to claim 2 is the superconducting coil according to claim 1,
The positions of the inner reel frame and the outer reel frame are relatively fixed.

The invention according to claim 3 is the superconducting coil according to claim 2,
The positions of the inner reel and the outer reel are fixed by an impregnation material, a fixture, or both.

The invention according to claim 4 is the superconducting coil according to claim 3,
An impregnation material is interposed between the inner winding frame and the first winding portion and between the outer winding frame and the first winding portion.

The invention according to claim 5 is the superconducting coil according to claim 3 or 4,
The impregnating material is curable resin, low melting point metal, paraffin, or grease.

The invention according to claim 6 is the superconducting coil according to any one of claims 3 to 5,
The impregnation material is also interposed between the outer winding frame and the second winding portion.

The invention according to claim 7 is the superconducting coil according to any one of claims 1 to 6,
The opening includes a slit that divides the outer winding frame along the central axis direction.

The invention according to claim 8 is the superconducting coil according to claim 7,
The inner winding frame is characterized in that the outer shape is circular and has a bulging portion that bulges toward the slit side of the outer winding frame.

The invention according to claim 9 is the superconducting coil according to claim 7 or 8,
On the outer peripheral surface of the inner winding frame or the inner peripheral surface of the outer winding frame, a protrusion or ridge that partitions one end portion and the other end portion of the first winding portion is provided at a position facing the slit. It is characterized by that.

The invention according to claim 10 is the superconducting coil according to any one of claims 1 to 6,
The opening is composed of a first opening through which one end of the first winding portion passes and a second opening through which the other end of the first winding portion passes.

The invention according to claim 11 is the superconducting coil according to any one of claims 1 to 10,
The superconducting wire is an oxide superconducting wire.

The invention described in claim 12 is a method of manufacturing a superconducting coil according to claim 1,
After fixing the relative position of the inner winding frame and the outer winding frame, the tape-shaped superconducting wire is spirally wound around the inner winding frame to form the first winding portion,
Further, each tape that passes through one end and the other end of the first winding part through the opening of the outer winding frame and continues to the one end and the other end of the first winding part. A superconducting wire in the form of a coil is wound on the outer periphery of the outer winding frame, and two-stage second winding portions are formed side by side in the central axis direction of the outer winding frame.

Invention of Claim 13 is a manufacturing method of the superconducting coil of Claim 1, Comprising:
The tape-shaped superconducting wire is spirally wound around the inner winding frame to form the first winding part,
Furthermore, the relative position of the inner winding frame and the outer winding frame is fixed after passing one end and the other end of the first winding portion through the opening of the outer winding frame,
Next, each of the tape-shaped superconducting wires continuous to one end and the other end of the first winding portion is wound on the outer periphery of the outer winding frame, and is wound in the direction of the central axis of the outer winding frame. The second winding part of the stage is formed side by side.

The invention described in claim 14 is the method of manufacturing a superconducting coil according to claim 12 or 13,
Before the two-stage second winding part is formed side by side in the central axis direction of the outer winding frame, a curable impregnating material is interposed between the inner winding frame and the outer winding frame and cured. To do.

In the above-mentioned invention, the first winding part wound spirally between the inner winding frame and the outer winding frame is disposed, and the tape-like shape is continuous to one end and the other end of the first winding part. Since the opening for passing the superconducting wire in the outer circumference is provided in the outer winding frame, the influence on the edgewise distortion of the spiral first winding portion due to radial expansion and contraction around each winding frame Therefore, it is possible to reduce the occurrence of deterioration of superconducting characteristics.
In addition, this makes it possible to suppress the influence of heat shrinkage during cooling of the superconducting coil and electromagnetic force at the coil central portion during energization, and to maintain high superconducting characteristics of the first winding portion.
In addition, since the work that requires precision like the conventional putty is not required, the manufacturing can be facilitated.

  In addition, the superconducting coil can be easily manufactured by steps such as fixing the inner and outer winding frames, forming the first winding portion, inserting the opening of the first winding portion, and forming the second winding portion. It is possible to easily provide a superconducting coil.

FIG. 1A is a plan view of a superconducting coil according to the first embodiment, and FIG. 1B is a perspective view. It is a perspective view which shows the structure of the tape-shaped superconducting wire which forms a 1st winding part and a 2nd winding part. 3A is a plan view of the inner reel and the outer reel, and FIG. 3B is a front view. It is a perspective view of a side plate, an inner winding frame, and an outer winding frame. FIG. 5A is a plan view of the inner and outer reels of the second embodiment, and FIG. 5B is a front view. 6A is a plan view of the inner and outer reels of the third embodiment, FIG. 6B is a cross-sectional view taken along line XX of FIG. 6A, and FIG. 6C. These are sectional drawings which show the other sectional structure along the XX line of FIG. 6 (A). FIG. 7A is a plan view of the inner reel and the outer reel of the fourth embodiment, and FIG. 7B is a front view. FIG. 8A is a plan view of an inner reel and an outer reel of the fifth embodiment, FIG. 8B is a front view, and FIG. 8C is a bottom view. FIG. 9A is a plan view of an inner reel and an outer reel of the sixth embodiment, and FIG. 9B is a plan view of an example in which a bulge is further provided. It is a perspective view of the conventional superconducting coil. It is sectional drawing of the winding frame of the conventional superconducting coil.

[First embodiment]
Hereinafter, a preferred first embodiment for carrying out the present invention will be described with reference to the drawings. However, the embodiments described below are given various technically preferable limitations for carrying out the present invention, but the scope of the present invention is not limited to the following embodiments and illustrated examples.

[Overview of superconducting coil]
1A is a plan view of the superconducting coil 10, and FIG. 1B is a perspective view.
The superconducting coil 10 includes at least a superconducting wire for an inner winding 20, an outer winding 30 disposed outside the inner winding 20, and a tape-like superconducting wire 100 on the outer periphery of the inner winding 20. The first winding portion 40 wound spirally so as to be shifted by one width of 100, and the tape-shaped superconducting wire 100 continuous to one end and the other end of the first winding portion 40 are outside. This is a so-called double pancake coil provided with a two-stage second winding part 50 wound around the outer periphery of the winding frame 30.

[Superconducting wire]
FIG. 2 is a perspective view showing the structure of the tape-shaped superconducting wire 100 forming the first winding portion 40 and the second winding portion 50.
The superconducting wire 100 covers a laminate in which an intermediate layer 2, a superconducting layer 3, and a protective layer 4 are laminated in this order on one main surface (one surface in the thickness direction) of the substrate 1, and covers the periphery of the laminate. It is a tape-shaped superconducting wire provided with the copper stabilization layer 5 to be used.
As a superconductor constituting the superconducting layer 3, an RE-based superconductor (RE: rare earth element) exhibiting superconductivity at a liquid nitrogen temperature or higher, for example, an yttrium-based superconductor represented by the chemical formula YBa ₂ Cu ₃ O _7-y (hereinafter referred to as “superconductor”). Y-based superconductor) is typical. That is, the tape-shaped superconducting wire 100 is an oxide superconducting wire.
In FIG. 2, the tape-shaped superconducting wire 100 is shown to be thicker than the tape width, but in actuality, the thickness is very thin relative to the tape width.

[Inner reel]
As shown in FIG. 1, the inner reel 20 is cylindrical and has a height that is at least twice the width of the superconducting wire 100 in the central axis direction.
The inner winding frame 20 is formed of an insulating resin (for example, FRP (fiberglass reinforced plastics)) so that no eddy current is generated when the superconducting coil 10 is energized.

[Outside reel]
As shown in FIG. 1, the outer reel 30 is cylindrical and has a height similar to that of the inner reel 20 in the central axis direction.
Further, since the outer winding frame 30 is disposed on the outer periphery of the inner winding frame 20 via the first winding portion 40, the inner radius is obtained by adding the thickness of the superconducting wire 100 to the outer radius of the inner winding frame 20. It is a dimension.

In addition, the outer reel 30 is formed with a slit 31 as an opening over the entire height so as to divide a part of the circumference.
Since a part of the circumference of the outer winding frame 30 is divided by the slit 31, no eddy current is generated when the superconducting coil 10 is energized. Therefore, the outer reel 30 may be formed from an insulator, but other materials having the required strength can be selected. The outer reel 30 is preferably formed from a high thermal conductivity material, for example, a metal such as copper, in order to increase the cooling efficiency of the coil.

[First winding part]
The first winding portion 40 is for electrically connecting the superconducting wires 100 constituting the two second winding portions 50 formed on the outer periphery of the outer winding frame 30 in two upper and lower stages.
As shown in FIG. 3, the first winding portion 40 is composed of a superconducting wire 100 wound around the outer periphery of the inner winding frame 20 by one turn, and at least in the central axis direction with respect to the turn. Are wound spirally so as to be shifted by one width of the superconducting wire 100.
Since the amount of deviation in the central axis direction with respect to one turn of the first winding portion 40 becomes larger, the distortion in the edgewise direction becomes larger. For example, in FIG. 3B, a gap is formed between one end and the other end of the first winding part 40, but it is desirable that this gap is narrow, and the one end and the other end are It may be in contact.

Moreover, both the one end part and the other end part of the first winding part 40 extend in the opposite directions from the slit 31 to the outside of the outer winding frame 30, and the one end part and the other end part are respectively It is continuously connected to the superconducting wire 100 that constitutes the second winding portion 50 disposed so as to be superposed vertically.
The slit 31 of the outer reel 30 is formed with a certain width in the circumferential direction. This is to reduce the bending in the flatwise direction that occurs in the superconducting wire 100 on one end side and the superconducting wire 100 on the other end side of the first winding portion 40 that passes through the slit 31.

Moreover, the clearance gap between the inner surface of the 1st winding part 40 and the outer peripheral surface of the inner winding frame 20, and the clearance gap between the outer surface of the first winding part 40 and the inner peripheral surface of the outer winding frame 30, The inner winding frame 20, the first winding portion 40, and the outer winding frame 30 are relatively fixed.
As the impregnating material, a soft material such as paraffin or grease may be used, but a material that can be firmly fixed to each other by a hardened impregnating material such as an epoxy or cyano adhesive is more preferable. Further, a low melting point metal such as solder may be used as the impregnation material.
Moreover, you may fix with an adhesive tape instead of an impregnation material.

[Second winding part]
One second winding portion 50 in which the superconducting wire 100 connected to one end of the first winding portion 40 is wound on the outer peripheral surface of the outer winding frame 30 in a stacked state so as to overlap the tape plane, and the first winding The other second winding part 50 in which the superconducting wire 100 connected to the other end of the part 40 is wound so as to overlap the second winding part 50 in the opposite direction is formed side by side in the central axis direction. .
As described above, one end of the superconducting wire 100 that is the innermost side of the second winding portion 50 and the other second winding portion 50 are connected via the first winding portion 40. Therefore, a connection terminal (not shown) can be provided at the end of the superconducting wire 100 which is the outermost side of each second winding part 50.

Further, the gap between the inner surface of the superconducting wire 100 that is the innermost layer of the second winding portion 50 and the outer peripheral surface of the outer winding frame 30 is filled with an impregnating material and relatively fixed. .
As the impregnating material, the same material as the first winding portion 40 can be used.

[Manufacturing method of superconducting wire]
A method for manufacturing the superconducting coil 10 will be described.
First, as shown in FIG. 3, the superconducting wire 100 constituting the first winding portion 40 is spirally wound around the inner winding frame 20 for one round. Thereby, the 1st coil | winding part 40 is formed (1st coil | winding part formation process).
Further, with respect to the outer winding frame 30 disposed outside the inner winding frame 20, the one end portion and the other end portion of the first winding portion 40 are reversed from the slit 31 of the outer winding frame 30 of the outer winding frame 30. Pass the outside in the direction (opening insertion process).
And the relative position of the inner side winding frame 20 and the outer side winding frame 30 is fixed by the side plate 60 shown in FIG. 4 (winding frame fixing process).
The side plate 60 has grooves 61 and 62 into which one end portion in the central axis direction of the inner reel 20 and one end portion in the central axis direction of the outer reel 30 can be respectively inserted.
The side plates 60 may be provided not only on one end side in the central axis direction of the inner reel 20 and the outer reel 30 but on both ends.
Further, the impregnation material is impregnated with the gap between the first winding portion 40 and the inner winding frame 20 and the gap between the first winding portion 40 and the outer winding frame 30 (impregnation step).
Then, after the impregnated material is cured between the inner winding frame 20 and the outer winding frame 30, the superconducting wire 100 continuous to one end of the first winding portion 40 is formed on the outer peripheral surface of the outer winding frame 30. Winding is performed to form one second winding portion 50. Further, the superconducting wire 100 continuous to the other end of the first winding portion 40 is wound on the outer peripheral surface of the outer winding frame 30 to form one second winding portion 50 (second winding portion). Forming step). When the first winding of each second winding part 50 is started, the impregnating material is interposed between the first superconducting wire 100 and the outer peripheral surface of the outer winding frame 30, and finally cured.
The superconducting coil 10 is manufactured through these steps.

[Technical effects of the first embodiment]
Since the superconducting coil 10 has a structure in which the first winding portion 40 is constrained in the radial inner side and the outer side by the inner winding frame 20 and the outer winding frame 30, the edge of the spiral first winding portion 40 due to the expansion and contraction in the radial direction. The influence on the distortion in the width direction can be reduced, and the occurrence of deterioration in superconducting characteristics can be reduced.
In addition, this makes it possible to suppress the effects of heat shrinkage during cooling of the superconducting coil 10 and electromagnetic force at the center of the coil during energization, and maintain the superconducting characteristics of the first winding portion 40 high.

In particular, in the superconducting coil 10, since the positions of the inner winding frame 20 and the outer winding frame 30 are relatively fixed by the side plates 60 on one side or both sides, the distortion in the edgewise direction of the first winding portion 40 is caused. It is possible to further effectively reduce the influence of.
Further, since a curable impregnating material is interposed between the inner winding frame 20 and the first winding portion 40 and between the outer winding frame 30 and the first winding portion 40, the edge of the first winding portion 40 It is possible to more effectively reduce the influence on the distortion in the width direction.
Further, by fixing the inner winding frame 20, the first winding portion 40, and the outer winding frame 30 with an impregnation material, fixing the outer winding frame 30 and the second winding portion 50 with an impregnation material, and the like, It is possible to more effectively prevent the winding portions 40 and 50 from slipping from the winding frame 20 or the outer winding frame 30.

Further, in the superconducting coil 10, the slit 31 is formed in the outer winding frame 30, and one end and the other end of the first winding part 40 are passed through to the outside. It is possible to realize a structure that restrains from inside and outside.
Moreover, since this slit 31 can pass both the one end part and the other end part of the 1st coil | winding part 40, it is not necessary to provide an opening separately and can be formed easily.

  Moreover, in the manufacturing method of the superconducting coil 10, since the impregnating material between the inner winding frame 20 and the outer winding frame 30 is cured, the second winding portion 50 is formed. The generation of tensile stress on the first winding portion 40 due to the winding operation of the winding portion 50 is suppressed, the influence on the distortion in the edgewise direction of the first winding portion 40 is reduced, and the first winding portion 40 is also reduced. It is possible to maintain high superconducting characteristics.

[Another example of manufacturing method of superconducting wire]
In addition, as a manufacturing method of a superconducting wire, it is possible to partially change the order of various processes.
For example, in the above-described example, a winding frame fixing step of relatively fixing the inner winding frame 20 and the outer winding frame 30 is performed after the first winding portion forming step and the opening insertion step. After performing the frame fixing step, other steps may be performed.
Specifically, after the inner winding frame 20 and the outer winding frame 30 are relatively fixed in advance by the side plate 60 of FIG. 4, the first winding portion forming step, the opening insertion step, the impregnation step, You may perform a two winding part formation process.
The superconducting coil 10 can also be manufactured by this method.

[Second Embodiment]
As a second embodiment, another example of the outer reel of the inner reel will be described.
The inner winding frame 20A shown in FIG. 5 has a circular outer shape and a bulging portion 21A that bulges toward the slit 31A side of the outer winding frame 30A. The outer winding frame 30A has a larger opening width in the circumferential direction of the slit 31A than the slit 31 of the outer winding frame 30 described above, corresponding to the bulging portion 21A of the inner winding frame 20A.

The bulging portion 21A has an elliptical arc shape when viewed from the center axis direction, and the outer shape smoothly and continuously continues to a circular portion other than the bulging portion 21A of the inner winding frame 20A. .
By providing the bulging portion 21A, the one end and the other end of the first winding portion 40 are in close contact with the outer peripheral surface of the bulging portion 21A before and after passing through the slit 31A. The bending in the flatwise direction is reduced, and the superconducting wire 100 can be protected.
Since the allowable minimum bending radius in the flatwise direction of the superconducting wire 100 used for the superconducting coil is generally about 10 [mm], the bulging portion 21A has a larger curvature radius than the minimum bending radius as a whole. Just do it.
In the case of the inner winding frame 20A and the outer winding frame 30A, the relative positions are fixed by the side plates formed with grooves according to the shape viewed from the central axis direction.

[Third embodiment]
As a third embodiment, another example of the outer reel of the inner reel will be described.
The inner reel 20B and the outer reel 30B shown in FIG. 6A have the same shape as viewed from the central axis direction as the inner reel 20 and the outer reel 30 in FIG. 3, but as shown in FIG. 6B. Moreover, the cross-sectional shape along the XX line in the inner winding frame 20B is different.
That is, the protrusion 22B that partitions the one end portion and the other end portion of the first winding portion 40 is formed on the outer peripheral surface of the inner winding frame 20B and facing the slit 31B of the outer winding frame 30B. The protrusions 22 </ b> B are set so that the protrusion height is higher than at least the thickness of the superconducting wire 100.
The protrusions 22B are provided on both sides of the slit 31B.
By this protrusion 22B, at the same position, it is possible to protect against pressure on one end and the other end of the first winding portion 40 by the edge portion of the slit 31B of the outer winding frame 30B. Accordingly, it is possible to effectively reduce the occurrence of deterioration of superconducting characteristics due to destruction or damage of the superconducting wire 100.

In addition, you may form the protruding item | line along the circumferential direction instead of the protrusion 32B.
Further, as shown in FIG. 6C, a protrusion 32B (or protrusion) may be provided not on the inner winding frame 20B side but on the inner peripheral surface side of the outer winding frame 30B and facing the slit 31B. Good.
In the third embodiment, the projection 22B is provided on the inner winding frame 20B having the bulging portion 21B in the same manner as the inner winding frame 20A. However, the present invention is not limited to this. You may provide a processus | protrusion or a protruding item | line in the position desired in the slit 31 of the inner side winding frame 20 (refer FIG. 1) which is not carried out.

[Fourth embodiment]
As a fourth embodiment, another example of the outer reel will be described.
The inner reel 20 shown in FIG. 7 is the same as the inner reel 20 shown in FIGS. 1 and 3 described above.
On the other hand, the outer winding frame 30D has a thickness more than twice the allowable minimum bending radius (for example, 10 [mm]) in the flatwise direction of the superconducting wire 100, and the end on the slit 31D side is semicircular. The superconducting wire 100 of the first winding portion 40 passed through the slit 31D is prevented from being bent with a curvature smaller than the minimum bending radius allowed.
Thereby, the superconducting wire 100 is protected.
In the case of these outer reels 30D as well, the relative positions are fixed by the side plates on which grooves corresponding to the shape viewed from the central axis direction are formed.

  In the case of the inner reel 20 and the outer reel 30D, the relative positions are fixed by the side plates on which grooves corresponding to the shape seen from the central axis direction are formed.

[Fifth embodiment]
As the fifth embodiment, another example of the outer reel will be described.
The inner reel 20 shown in FIG. 8 is the same as the inner reel 20 shown in FIGS. 1 and 3 described above.
On the other hand, the outer winding frame 30E replaces the slit 31 with a first opening 311E that passes through one end of the first winding part 40 and a second opening 312E that passes through the other end of the first winding part 40. This is different from the outer reel 30 described above.
That is, as shown in FIG. 8B, the first opening 311E and the second opening 312E are arranged on the outer circumferential surface of the outer reel 30 so as to be shifted in the central axis direction and the circumferential direction. .
Although the first opening 311E and the second opening 312E are connected on the inner peripheral surface side of the outer reel 30, the inner peripheral surface side also has the first opening 311E and the second opening. 312E may be separated.

Thus, the one end part and the other end part of the first winding part 40 do not need to pass through one common opening part, and are individually passed through the first opening part 311E and the second opening part 312E. Also good.
Then, by dividing the opening into the first opening 311E and the second opening 312E in this way, one end and the other end of the first winding portion 40 that are passed in opposite directions to each other, The first opening 311E and the second opening 312E can be formed in a direction suitable for each direction, so that bending of the superconducting wire 100 can be reduced and the superconducting wire 100 can be protected. It becomes.

  In the case of the inner reel 20 and the outer reel 30E, the relative positions are fixed by the side plates in which grooves corresponding to the shape seen from the central axis direction are formed.

[Sixth embodiment]
As a sixth embodiment, another example of the inner reel and the outer reel will be described.
As shown in FIG. 9A, the shape of the inner winding frame 20F and the outer winding frame 30F viewed from the central axis direction is not limited to a circle, and may be, for example, an oval shape (race track coil shape). Furthermore, it is good also as an ellipse shape which curved the elliptical center parallel part.
Thus, the shape seen from the central axis direction of the inner winding frame 20F and the outer winding frame 30F is not limited to a circle, and a shape in which bending does not occur with a curvature smaller than the minimum bending radius allowed when the superconducting wire 100 is wound. If it is, it can be set as other various shapes.

  Further, as shown in FIG. 9B, the width of the slit 31G is set wide even when the shapes of the inner reel 20G and the outer reel 30G viewed from the central axis direction are other than circular. The bulging portion 21G may be formed on the inner winding frame 20G side.

  In the case of the inner reels 20F and 20G and the outer reels 30F and 30G, the relative positions are fixed by the side plates formed with grooves according to the shape seen from the central axis direction.

[Others]
In each of the above-described embodiments, the superconducting coil is fixed to the inner winding frame and the outer winding frame by the side plate and the curable impregnating material, but only one of the side plate and the curable impregnating material is used. It is good also as composition to do.

10 Superconducting coils 20, 20A, 20B, 20F, 20G Inner winding frames 21A, 21B, 21G Swelling portion 22B Protrusions 30, 30A, 30B, 30D, 30E, 30F, 30G Outer winding frames 31, 31A, 31B, 31D Slit 32B Protrusion 40 First winding portion 50 Second winding portion 60 Side plate 100 Superconducting wire 311E First opening 312E Second opening

Claims (14)

An inner reel,
An outer reel disposed outside the inner reel;
A tape-shaped superconducting wire, a first winding portion spirally wound around the outer periphery of the inner winding frame so as to shift at least one width of the superconducting wire;
A tape-shaped superconducting wire continuous to one end and the other end of the first winding part, and a two-stage second winding part wound around the outer periphery of the outer winding frame;
The outer winding frame includes an opening for passing a tape-shaped superconducting wire continuous to one end and the other end of the first winding part to the outer periphery.   The superconducting coil according to claim 1, wherein positions of the inner winding frame and the outer winding frame are relatively fixed.   The superconducting coil according to claim 2, wherein the positions of the inner winding frame and the outer winding frame are fixed by either an impregnation material, a fixture, or both.   4. The superconducting coil according to claim 3, wherein an impregnation material is interposed between the inner winding frame and the first winding portion and between the outer winding frame and the first winding portion.   The superconducting coil according to claim 3 or 4, wherein the impregnating material is a curable resin, a low melting point metal, paraffin, or grease.   The superconducting coil according to any one of claims 3 to 5, wherein the impregnation material is also interposed between the outer winding frame and the second winding portion.   The superconducting coil according to claim 1, wherein the opening includes a slit that divides the outer winding frame along a central axis direction thereof.   The superconducting coil according to claim 7, wherein the inner winding frame has a circular outer shape and a bulging portion that bulges toward the slit side of the outer winding frame.   Protrusions or ridges are provided on the outer circumferential surface of the inner winding frame or the inner circumferential surface of the outer winding frame, and partitioning one end and the other end of the first winding portion at a position facing the opening. The superconducting coil according to claim 7 or 8, wherein   The said opening part consists of a 1st opening part which lets one end part of the said 1st winding part pass, and a 2nd opening part which lets the other end part of the said 1st winding part pass. The superconducting coil according to any one of items 1 to 6.   The superconducting coil according to any one of claims 1 to 10, wherein the superconducting wire is an oxide superconducting wire. A method of manufacturing a superconducting coil according to claim 1,
After fixing the relative position of the inner winding frame and the outer winding frame, the tape-shaped superconducting wire is spirally wound around the inner winding frame to form the first winding portion,
Further, each tape that passes through one end and the other end of the first winding part through the opening of the outer winding frame and continues to the one end and the other end of the first winding part. A method of manufacturing a superconducting coil, wherein a superconducting wire in the form of a coil is wound on the outer periphery of the outer winding frame so as to form a two-stage second winding portion in the central axis direction of the outer winding frame. A method of manufacturing a superconducting coil according to claim 1,
The tape-shaped superconducting wire is spirally wound around the inner winding frame to form the first winding part,
Furthermore, the relative position of the inner winding frame and the outer winding frame is fixed after passing one end and the other end of the first winding portion through the opening of the outer winding frame,
Next, each of the tape-shaped superconducting wires continuous to one end and the other end of the first winding portion is wound on the outer periphery of the outer winding frame, and is wound in the direction of the central axis of the outer winding frame. A method of manufacturing a superconducting coil, comprising forming a second winding portion of a step. Before forming the two-stage second winding portion in the central axis direction of the outer winding frame,
The method of manufacturing a superconducting coil according to claim 12 or 13, wherein a curable impregnating material is interposed between the inner winding frame and the outer winding frame to be cured.

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