JP2016139657A - Superconducting coil and superconducting dynamo-electric machine stator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a superconducting coil capable of dislocating a plurality of superconducting wire rods by simple configuration.SOLUTION: In a superconducting coil constituted by winding a plurality of laminated tape-like superconducting wire rods, notches 33c, 34c are formed in at least one of the plurality of superconducting wire rods A, B, in a direction including a direction component perpendicular to the longitudinal direction. When a superconducting wire rod adjacent to the superconducting wire rod having a notch formed therein rides over the notch, the superconducting wire rod having a notch formed therein crosses a superconducting wire rod adjacent thereto at the notch.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a superconducting coil and a superconducting rotating electrical machine stator.

  The superconducting coil is formed by winding a tape-shaped (or strip-shaped) superconducting wire composed of a material containing a superconductor. The tape-shaped superconducting wire can be wound only in a direction perpendicular to the tape surface (main surface), that is, in a direction in which the tape surface is wound, due to its shape restriction. The outer shape of the superconducting coil wound in this manner is generally a ring shape or a racetrack shape.

  There has also been proposed a superconducting coil in which a plurality of superconducting coils are formed by stacking a plurality of superconducting coils along the winding axis direction, and the superconducting coils of each stage are electrically connected to each other. For example, a so-called double pancake type superconducting coil in which two superconducting coil portions are stacked along the winding axis direction and the superconducting coils of the respective stages are electrically connected is widely known.

  Furthermore, in order to increase the amount of current flowing in the superconducting coil, the superconducting coil may be formed by winding a plurality of laminated superconducting wires in the form of tape. In this case, the laminated superconducting wires are connected in parallel.

  The electric resistance of the superconducting wire is zero or very small. However, due to the inductance of the superconducting coil composed of the superconducting wire, reactance as a pseudo electric resistance occurs when an alternating current is passed through the superconducting coil. In general, the reactance of the coil varies depending on the size of the hollow region surrounded by the coil, and the reactance increases as the hollow region increases. Therefore, the reactance on the outer peripheral side of the superconducting coil is larger than the reactance on the inner peripheral side.

  When a superconducting coil is formed by winding a plurality of laminated superconducting wires in the form of a tape, one superconducting wire among the plurality of superconducting wires is always on the inner circumference side or always on the outer circumference side than the other superconducting wires. Will be disposed. For this reason, the reactance of the coil part comprised with a certain superconducting wire differs from the reactance of the coil part comprised with another superconducting wire. Thereby, the magnitude | sizes of the electric current which flow through each superconducting wire differ. That is, the current flowing through the superconducting coil is biased. Such a current bias is called drift. When drift occurs, AC loss increases. Therefore, it is desirable to equalize the current flowing through each superconducting wire so that no drift occurs.

  In order to prevent a drift in the superconducting coil constituted by winding a plurality of laminated tape-like superconducting wires, dislocation of the plurality of superconducting wires constituting the superconducting coil is performed. Dislocation means to change the stacking order of a plurality of stacked superconducting wires. In general, the dislocation is performed at a portion of the double pancake superconducting coil where the superconducting coil at one stage is connected to the superconducting coil at the other stage.

  Patent Document 1 discloses a double pancake type superconducting coil configured by winding a laminate of a plurality of tape-shaped superconducting wires. According to the double pancake type superconducting coil described in Patent Document 1, the inner circumference of the transition between the innermost circumferential turn of the first stage superconducting coil part and the innermost circumferential turn of the second stage superconducting coil part The superconducting wire on the side and the superconducting wire on the outer periphery are dislocated.

  Patent Document 2 has a pair of coil parts in which a plurality of superconducting wires are insulated and bundled together and wound in a pancake shape, and one coil part has an aggregate conductor on the innermost layer side. Disclosed is a double pancake superconducting coil that is displaced and connected to the other coil side. According to the double pancake type superconducting coil described in Patent Document 2, a plurality of superconducting wires are dislocated at different positions in the circumferential direction of the coil portion for each predetermined number.

  In Patent Document 3, a superconducting coil part in which a wire group in which a plurality of superconducting wires are connected in parallel is wound in one direction and a wire group in which a plurality of superconducting wires are connected in parallel are wound in the other direction. A multilayer superconducting coil comprising a superconducting coil portion is disclosed. According to the laminated superconducting coil described in Patent Document 3, one superconducting coil portion and the other superconducting coil portion are laminated along the winding axis direction. Moreover, each of the plurality of superconducting wires arranged from the inner peripheral side to the outer peripheral side of one superconducting coil portion is arranged in the direction from the outer peripheral side to the inner peripheral side of the other superconducting coil portion. By being connected to each of these, dislocation of the superconducting wire is performed.

JP 2008-166669 A JP 2010-238787 A JP 2011-91893 A

(Problems to be solved by the invention)
According to the superconducting coils described in Patent Document 1 and Patent Document 2, in order to displace the superconducting wire, the superconducting wire is bent in a plane parallel to the tape surface. Since the superconducting wire is difficult to bend in the direction parallel to the tape surface, that is, in the in-plane direction, if it is bent in such an in-plane direction that is difficult to bend, distortion occurs in the tape surface of the superconducting wire. Due to the occurrence of such strain, the superconducting characteristics may be deteriorated. In addition, according to Patent Document 1 and Patent Document 2, since a special facility and procedure for transposing a superconducting wire are necessary, the manufacturing cost of such a superconducting coil is high. Further, according to the superconducting coil described in Patent Document 3, the positional relationship between one superconducting coil part and the other superconducting coil part is not symmetrical, and the order of dislocations of each superconducting wire is limited, so that the current equalization The effect of conversion is halved.

  An object of the present invention is to provide a superconducting coil that can displace a plurality of superconducting wires with a simple configuration, and a superconducting rotating electrical machine stator using such a superconducting coil.

(Means for solving the problem)
The present invention is a superconducting coil constituted by winding a plurality of laminated superconducting wires in the form of a tape, and at least one superconducting wire (33, 34) of the plurality of superconducting wires is arranged in the longitudinal direction. Cutout portions (33c, 34c) cut along a direction including a direction component perpendicular to the cutout portion are formed, and the superconducting wire adjacent to the superconducting wire in which the cutout portions are formed in the stacking direction By providing the superconducting coil, the superconducting wire in which the notch is formed and the superconducting wire adjacent to the superconducting wire are crossed at the notch.

  According to the present invention, at least one of the plurality of laminated tape-like superconducting wires constituting the superconducting coil is formed with a notch cut along a direction including a direction component perpendicular to the longitudinal direction. The And the superconducting wire adjacent to the superconducting wire in which the notch is formed in the laminating direction passes over the notch. For this reason, the superconducting wire in which the notch is formed and the superconducting wire adjacent thereto intersect at the notch. By such an intersection, the position (arrangement) in the stacking direction of the superconducting wire in which the notch portion is formed and the superconducting wire adjacent thereto in the stacking direction, that is, the stacking order is switched. In this way, the superconducting wire having the notch and the superconducting wire adjacent thereto are dislocated.

  As described above, according to the present invention, the notch is formed in the superconducting wire, and the superconducting wire in which the notch is formed and the superconducting wire adjacent thereto are crossed at the notch. Thus, the superconducting wire can be dislocated. In addition, the superconducting wire that gets over the notch is slightly bent to get over the notch, but the bending direction does not include the in-plane direction component of the superconducting wire. That is, by bending the superconducting wire in the direction in which the superconducting wire is wound, the superconducting wire can be dislocated at the notch. Therefore, as in the prior art, it is possible to prevent the superconducting wire from being distorted by bending the superconducting wire in the in-plane direction in order to displace the superconducting wire.

  In the present invention, overcoming the notch portion means that a superconducting wire disposed adjacent to one tape surface side of the superconducting wire having the notch portion straddles the notch portion, thereby forming the notch portion. It means that the superconducting wire is arranged adjacent to the other tape surface side. Therefore, the superconducting wire disposed adjacent to the inner peripheral side of the superconducting wire having the cutout portion is disposed adjacent to the outer peripheral side of the superconducting wire having the cutout portion by getting over the notch portion. Further, the superconducting wire arranged adjacent to the outer peripheral side of the superconducting wire formed with the notch is disposed adjacent to the inner peripheral side of the superconducting wire formed with the notch by overcoming the notch.

  In the present invention, the superconducting wire means a member that is formed in a tape shape (or strip shape) and is made of a material containing a superconducting material. Therefore, the superconducting wire may be composed only of the superconductor, or may be composed of a portion made of a superconductor and a portion made of a conductive material that is not a superconductor. May be. In this case, the cutout portion may be formed in a portion made of a superconductor, or may be formed in a portion made of a conductive material (for example, copper) that is not a superconductor.

  In the present invention, the notch is formed with a portion cut along a direction including a direction component perpendicular to the longitudinal direction of the superconducting wire, that is, a notch step portion that is not parallel to the longitudinal direction of the superconducting wire. Any shape can be used. For example, a slit extending along a direction including a direction component perpendicular to the longitudinal direction may be formed in the superconducting wire. Moreover, a wide part and a narrow part may be formed in a superconducting wire, and a notch-shaped step part may be formed in the connection part of both parts. In this case, the shape of the notch is a crank shape.

  Further, it is preferable that a notch portion is formed in each of the superconducting wires adjacent to each other in the stacking direction, and the notch portions formed in each of the superconducting wires are fitted to each other. According to this, when the notch parts formed in each of the adjacent superconducting wires are fitted together, one superconducting wire gets over the notch part formed in the other superconducting wire, and the other superconducting wire is Get over the notch formed in one superconducting wire. That is, the adjacent superconducting wire is dislocated at the portion where the notches are fitted together. Further, by fitting the notch portions, an increase in the bulge in the width direction (direction perpendicular to the length direction and the thickness direction) of the superconducting wire at the dislocation can be suppressed.

  In addition, the notch portion connects the facing end portions of the two superconducting wires arranged with a gap along the longitudinal direction with a conductor having a width narrower than the width of the two superconducting wires. By doing so, it may be formed. According to this, a notch part can be easily formed in a superconducting wire.

  In addition, an auxiliary conductor may be connected to a portion of the superconducting wire having the notch formed therein, the width of which is reduced by the formation of the notch. By forming the notch, the width of the portion where the notch is formed is reduced. The magnitude of the current that can be passed through the narrowed part is smaller than the magnitude of the current that can be passed through the part that is not narrowed. On the other hand, according to the present invention, by connecting the auxiliary conductor to the portion whose width is narrowed by the formation of the notch, the magnitude of the current that can be passed through the portion whose width is narrowed is increased. Is done. Therefore, the critical current (Ic) is increased, and a large current can flow through the superconducting coil.

  Moreover, the superconducting coil according to the present invention is composed of a first superconducting coil portion configured by winding a plurality of first superconducting wires composed of a superconducting material in a stacked state, and a superconducting material. A second superconducting coil portion formed by winding a plurality of second superconducting wires in a stacked state, an inner peripheral end portion of each first superconducting wire constituting the first superconducting coil portion, It is preferable to provide a plurality of connecting members that respectively connect the inner peripheral ends of the respective second superconducting wires constituting the two superconducting coil portions. Further, the first superconducting coil part and the second superconducting coil part are arranged so as to be overlapped along the winding axis direction, and the plurality of connecting members are arranged on the inner circumferences of the first superconducting coil part and the second superconducting coil part. It is good that they are stacked. And it is good for the notch part to be formed in at least one of the several connection member arrange | positioned by lamination | stacking.

  According to this, for example, a plurality of superconducting wires (first superconducting wire) constituting the one coil portion (first superconducting coil portion) of the double pancake type superconducting coil and the other coil portion (second superconducting coil portion) are arranged. A plurality of superconducting wires (second superconducting wires) to be configured are connected by a plurality of connecting members that connect their inner peripheral ends. And a notch part is provided in at least one of a some connection member, and a some connection member is made to cross | intersect using the notch part. In this way, the first superconducting wire and the second superconducting wire are dislocated at the connecting portion between the first superconducting coil and the second superconducting coil with a simple configuration and without distorting the superconducting wire. be able to.

  In this case, the shape of the notch formed in the connecting member may be a crank shape. According to this, before the connecting member adjacent to the connecting member in which the crank-shaped notch is formed climbs over the notch, the connecting member in which the notch is formed and the connecting member adjacent to the connecting member are overlapped. There are areas that are not. For this reason, the contact area between the connection members is reduced, and the superconducting coil can be configured compactly.

  Moreover, the connection member may be comprised with the electroconductive metal. According to this, the processing of the connecting member is easy. In this case, it is more preferable that the connecting member is made of copper. According to this, since the elastic deformation of the connecting member is easy, the connecting member in which the notch is formed and the connecting member adjacent to the connecting member can be easily crossed.

  Further, the connecting member may be made of a superconductor. According to this, the connection resistance in the connection member can be further reduced by using a superconductor (in particular, a thin film single crystal type superconductor such as an yttrium-based superconductor or a gadolinium-based superconductor) as the connection member.

  Further, the connecting member may have a portion made of a conductive metal and a portion made of a superconductor. When the connecting member is composed only of metal, there is a problem that the electrical resistance of the connecting member is large. On the other hand, when the connecting member is composed only of the superconductor, the superconducting breakdown (when excessive current flows through the connecting member) Quench) may occur. On the other hand, the above-described drawbacks can be compensated by using a conductive metal such as copper and a superconductor in combination as a material constituting the connection member. That is, the electric resistance of the connecting member can be reduced by the current flowing through the portion formed of the superconductor during normal operation (when an appropriate current is flowing). Further, when an excessive current flows, the excessive current flows through a portion made of metal. For this reason, the superconducting destruction of the part comprised by the superconductor can be prevented.

  In addition, the superconducting coil includes a first arc portion and a first linear portion that connect the first linear portion and the second linear portion that are disposed opposite to each other, one end portion of the first linear portion, and one end portion of the second linear portion. And a second arc portion connecting the other end of the second linear portion and the second arc portion, and the connecting member has a portion where the first superconducting wire is connected to the first straight line. The portion where the second superconducting wire is connected is provided in the second straight portion, and the portion where the notch is formed is provided in the first arc portion. . According to this, since the first superconducting wire and the second superconducting wire are connected to the connecting member at the straight portion of the superconducting coil, the connecting member and the first and second superconducting wires can be easily connected. The connection can be made reliably. Further, by forming the connecting member across the first arc portion, the position of the inner peripheral end portion of the first superconducting coil portion and the position of the inner peripheral end portion of the second superconducting coil portion can be matched. For this reason, the shape of the first superconducting coil portion and the shape of the second superconducting coil portion can be made substantially symmetrical.

  The present invention also provides a superconducting rotating electrical machine stator comprising a stator core having teeth and the superconducting coil having the above-described configuration, wherein the superconducting coil is wound around the teeth. According to this, the superconducting rotary electric machine stator provided with the superconducting coil which has the above-mentioned operation effect can be provided.

It is a front view of a superconducting rotating electrical machine stator. It is a schematic perspective view of the superconducting coil according to the first embodiment. It is the front view which looked at the 1st superconducting coil part and the 2nd superconducting coil part from the same winding direction. It is a schematic perspective view of a 1st connection member and a 2nd connection member. It is a perspective view which shows the state by which the 1st slit formed in the 1st connection member and the 2nd slit formed in the 2nd connection member were fitted. It is VI-VI sectional drawing of FIG. It is a figure which shows typically a mode that two laminated | stacked superconducting wires are dislocated using a 1st connection member and a 2nd connection member. It is the front view which looked at the 1st superconducting coil part and the 2nd superconducting coil which comprise the superconducting coil which concerns on 2nd embodiment from the same winding direction. It is a schematic perspective view of a 1st connection member, an intermediate connection member, and a 2nd connection member. It is sectional drawing which shows the state which the 1st connection member, the intermediate | middle connection member, and the 2nd connection member engaged. It is a figure which shows typically a mode that three laminated | stacked superconducting wires are dislocated using a 1st connection member, an intermediate | middle connection member, and a 2nd connection member. It is a schematic plan view which shows the 1st connection member and 2nd connection member which concern on 3rd embodiment. It is a schematic plan view which shows the 1st connection member which concerns on 4th embodiment, an intermediate connection member, and a 2nd connection member. It is a figure which shows the top view of the 1st connection member which concerns on 5th embodiment, an intermediate | middle connection member, and the 2nd connection member, and the state of the dislocation of these connection members. FIG. 10 is a plan view of a plurality of connection members according to a sixth embodiment, and a diagram showing a dislocation state of these connection members. It is a figure which shows the superconducting coil by which the notch was formed in each superconducting wire in the arbitrary places of a superconducting wire. It is a figure which shows the modification of the slit formed in a superconducting wire.

  Hereinafter, embodiments of the present invention will be described. FIG. 1 is a front view of a superconducting rotating electrical machine stator according to the present embodiment. As shown in FIG. 1, a superconducting rotating electrical machine stator 1 according to this embodiment includes a stator core 2 and a plurality of superconducting coils 3.

  The stator core 2 includes a cylindrical back yoke 2a and a plurality of teeth 2b protruding from the inner peripheral surface of the back yoke 2a toward the centripetal direction. The plurality of teeth 2b are provided at equal intervals along the circumferential direction of the back yoke 2a. A slot 2c is formed between adjacent teeth 2b. The slots 2c are also provided at equal intervals along the circumferential direction of the back yoke 2a.

  A superconducting coil 3 is attached to each tooth 2b. Superconducting coil 3 is formed by winding a superconducting wire around teeth 2b.

(First embodiment)
FIG. 2 is a schematic perspective view of the superconducting coil 3 according to the first embodiment. As shown in FIG. 2, the superconducting coil 3 includes a first straight portion 3a and a second straight portion 3b that are arranged to face each other, one end of the first straight portion 3a and one end of the second straight portion 3b. A first arc portion 3c that connects the end portions, and a second arc portion 3d that is formed in an arc shape and connects the other end portion of the first straight portion 3a and the other end portion of the second straight portion 3b, It is configured to have a racetrack shape when viewed from the winding axis direction.

  The superconducting coil 3 includes a racetrack-shaped first superconducting coil portion 31 and a second superconducting coil portion 32 as viewed from the winding direction, and these coil portions 31 and 32 are arranged in the winding direction (in FIG. 2). It is configured by superimposing along the vertical direction. That is, the superconducting coil 3 is a racetrack-shaped double pancake type superconducting coil.

  FIG. 3 is a front view of the first superconducting coil portion 31 and the second superconducting coil portion 32 as viewed from the same winding direction. As shown in FIG. 3, the first superconducting coil portion 31 and the second superconducting coil portion 32 have substantially symmetric shapes with respect to a plane perpendicular to the winding axis direction. The first superconducting coil portion 31 is formed by winding two laminated tape-shaped Bi-based superconducting wires (width 4.6 mm). Similarly, the 2nd superconducting coil part 32 is comprised by winding two laminated tape-shaped Bi type | system | group superconducting wires (4.6 mm in width). A tape surface (main surface) T is formed on the superconducting wire constituting each superconducting coil portion. Then, two superconducting wires are laminated along the direction perpendicular to the tape surface T.

  One of the two superconducting wires (first superconducting wire) constituting the first superconducting coil portion 31 is always arranged on the outer peripheral side of the other, and the other is always arranged on the inner peripheral side of the one. Similarly, one of the two superconducting wires (second superconducting wire) constituting the second superconducting coil portion 32 is always arranged on the outer peripheral side of the other, and the other is always arranged on the inner peripheral side of the one. . The superconducting wire arranged on the outer peripheral side of the first superconducting wire constituting the first superconducting coil part 31 is called a first outer superconducting wire 31out, and the superconducting wire arranged on the inner peripheral side is the first inner superconducting wire. It is called 31in. Of the second superconducting wires constituting the second superconducting coil section 32, the superconducting wire disposed on the outer peripheral side is called a second outer peripheral superconducting wire 32out, and the superconducting wire disposed on the inner peripheral side is the second inner peripheral superconducting wire 32in. Call it. Also, the first outer peripheral superconductor wire 31out and the first inner superconductor wire 31in in the laminated state are referred to as a first superconducting wire group 31T, and the second outer superconductor wire 32out and the second inner superconductor wire in the laminated state are called. 32 in is called the second superconducting wire group 32T. Accordingly, the first superconducting coil portion 31 is configured by winding the first superconducting wire group 31T, and the second superconducting coil portion 32 is configured by winding the second superconducting wire group 32T. .

  One end portion (outer peripheral end portion) of the first superconducting wire group 31T extends from the outermost periphery of the first superconducting coil portion 31, and one coil end of the superconducting coil 3 is formed by the extended portion P1. Configure. One end portion (outer peripheral end portion) of the second superconducting wire group 32T extends from the outermost periphery of the second superconducting coil portion 32, and the other coil end of the superconducting coil 3 is formed by the extended portion P2. Configure. The other end portion (inner peripheral end portion) Q1 of the first superconducting wire group 31T is located at the innermost periphery of the first superconducting coil portion 31, and the other end portion (inner peripheral end) of the second superconducting wire group 32T. Part) Q2 is located on the innermost periphery of the second superconducting coil part 32.

  As can be seen from FIG. 3, when the first superconducting coil portion 31 and the second superconducting coil portion 32 are viewed from the same winding axis direction, the winding direction of the first superconducting wire group 31T is the second superconducting wire group 32T. This is the direction opposite to the winding direction. Specifically, in the case shown in FIG. 3, the first superconducting wire group 31T is wound in the counterclockwise direction from the inner peripheral end portion toward the outer peripheral end portion, and the second superconducting wire group 32T It is wound clockwise from the peripheral end toward the outer peripheral end.

  The inner peripheral end of the first superconducting wire group 31T is constituted by the inner peripheral end of the first outer peripheral superconducting wire 31out and the inner peripheral end of the first inner superconducting wire 31in. Among these, the inner peripheral end of the first outer peripheral superconducting wire 31out is connected to the first connection member 33, and the inner peripheral end of the first inner peripheral superconducting wire 31in is connected to the second connecting member 34. Further, the inner peripheral end of the second superconducting wire group 32T is constituted by the inner peripheral end of the second outer peripheral superconducting wire 32out and the inner peripheral end of the second inner superconducting wire 32in. Among these, the inner peripheral end portion of the second outer peripheral side superconducting wire 32out is connected to the second connecting member 34, and the inner peripheral end portion of the second inner peripheral side superconducting wire 32in is connected to the first connecting member 33. In FIG. 3, the first connection member 33 and the second connection member 34 are indicated by broken lines.

  FIG. 4 is a schematic perspective view of the developed first connecting member 33 and second connecting member 34. As shown in FIG. 4, the first connecting member 33 is formed in a long flat plate shape having an outer surface 33a and an inner surface 33b opposite to the outer surface 33a. Moreover, the 2nd connection member 34 is formed in the elongate flat plate shape which has the inner surface 34b on the opposite side to the outer surface 34a and the outer surface 34a. The 1st connection member 33 and the 2nd connection member 34 are comprised with the gadolinium (Gd) type superconducting wire, The width | variety is 10 mm.

  The inner peripheral end of the first outer peripheral superconducting wire 31out is connected to the outer surface 33a on one end side in the longitudinal direction of the first connection member 33 by soldering, and the other end in the longitudinal direction of the first connection member 33 The inner peripheral end of the second inner peripheral superconducting wire 32in is connected to the outer surface 33a on the side by soldering. Further, the first inner peripheral superconducting wire 31in is connected to the outer surface 34a on one end side in the longitudinal direction of the second connection member 34 by soldering, and the other end side in the longitudinal direction of the second connection member 34 is connected. An inner peripheral end portion of the second outer peripheral superconducting wire 32out is connected to the outer surface 34a by soldering.

  A first slit (notched portion) 33 c is formed at a substantially intermediate portion in the longitudinal direction of the first connecting member 33. The first slit 33c opens on one side of the first connection member 33, and extends from the opening portion in a direction perpendicular to the longitudinal direction. A second slit (notch) 34 c is formed at a substantially intermediate portion in the longitudinal direction of the second connecting member 34. The second slit 34c opens on one side of the second connecting member 34, and extends from the opening portion in a direction perpendicular to the longitudinal direction. The length of the first slit 33c and the second slit 34c (the length in the width direction of the connection members 33, 34) is 5.5 mm, and the width (the length of the connection members 33, 34 in the longitudinal direction) is 1 mm. . The length (5.5 mm) of the slits 33 c and 34 c is at least half the width (10 mm) of the connection members 33 and 34.

  The first connecting member 33 and the second connecting member 34 are laminated adjacent to each other along the thickness direction at the inner peripheral wall portion of the superconducting coil 3. At this time, the first connection member 33 and the second connection member 34 are laminated so that the outer surface 33a of the first connection member 33 and the outer surface 34a of the second connection member 34 face the same direction. Moreover, the 1st connection member 33 and the 2nd connection member 34 are mutually engaged by the fitting of the slit formed in each. That is, the first slit 33c formed in the first connection member 33 and the second slit 34c formed in the second connection member 34 are fitted together, that is, the bottom wall of the first slit 33c and the second slit 34c. The first connection member 33 and the second connection member 34 are engaged with each other so that the bottom walls of the slits 34c are brought together.

  FIG. 5 is a perspective view showing a state in which the first slit 33 c formed in the first connection member 33 and the second slit 34 c formed in the second connection member 34 are fitted together. 6 is a cross-sectional view taken along line VI-VI in FIG. As shown in FIGS. 5 and 6, the first connection member 33 and the second connection member 34 are engaged by fitting the slits 33 c and 34 c together. Moreover, the 1st connection member 33 and the 2nd connection member 34 are laminated | stacked and arrange | positioned adjacently along those thickness directions. At this time, the first outer peripheral superconducting wire 31out connected to one end of the first connecting member 33 and the first inner superconducting wire 31in connected to one end of the second connecting member 34 are And laminating along the thickness direction. Further, the second inner peripheral side superconducting wire 32in connected to the other end of the first connecting member 33 and the second outer peripheral side superconducting wire 32out connected to the other end of the second connecting member 34, They are laminated along their thickness direction. Further, as can be seen from FIG. 5, the longitudinal axis of the first outer peripheral superconductor wire 31out and the first inner superconductor wire 31in stacked, the second outer superconductor wire 32out and the second inner superconductor wire 31in stacked. The longitudinal-direction axes of the circumferential superconducting wire 32in are parallel, but are shifted (offset) in the width direction (the direction perpendicular to the length direction and the thickness direction) of these superconducting wires.

  In addition, when the 1st connection member 33 and the 2nd connection member 34 are laminated | stacked adjacently, in order to avoid conduction | electrical_connection between both, on the surface of each connection member 33 and 34, an insulating polyimide film is provided. Is covered. The outer peripheral surfaces of the first outer peripheral superconducting wire 31out, the first inner peripheral superconducting wire 31in, the second outer peripheral superconducting wire 32out, and the second inner peripheral superconducting wire 32in are also covered with insulation.

  When the first connection member 33 and the second connection member 34 are engaged, the second connection member 34 is connected to the first connection member 33 at a portion where the first slit 33c and the second slit 34c are fitted to each other. It passes through the formed first slit 33c. At this time, the 2nd connection member 34 gets over the notch level | step difference which forms the 1st slit 33c. Further, when the first connection member 33 and the second connection member 34 are engaged, the first connection member 33 is connected to the second connection member 34 at a portion where the first slit 33 c and the second slit 34 c are fitted to each other. It passes through the formed second slit 34c. At this time, the 1st connection member 33 gets over the notch level | step difference which forms the 2nd slit 34c.

  Thereby, the 1st connection member 33 and the 2nd connection member 34 cross in the plane containing those longitudinal directions and a lamination direction. The position (arrangement) in the stacking direction of the first connecting member 33 and the second connecting member 34 is reversed with such an intersection as a boundary. That is, the stacking order of the first connection member 33 and the second connection member 34 is switched. More specifically, in FIG. 6, the upper direction in the vertical direction (stacking direction) is defined as the outer peripheral side, the lower direction is defined as the inner peripheral side, and the left side in the left and right direction (longitudinal direction) is defined as one end side. If one side is defined as the other end side, the first connecting member 33 is arranged on the outer peripheral side of the second connecting member 34 on one end side of the portion X where the first slit 33c and the second slit 34c are fitted to each other. The first connection member 33 is arranged on the inner peripheral side of the second connection member 34 on the other end side of the portion X.

  As described above, in the present embodiment, the first connecting member 33 and the second connecting member 34 that are adjacently stacked are formed on the mating connecting member at the fitting position of the slits 33c and 34c. Crosses by overcoming the notch steps that make up the slit. By such an intersection, the first outer peripheral superconductor wire 31out disposed on the outer peripheral side in the first superconducting coil portion 31 and the second outer conductor disposed on the inner peripheral side in the second superconducting coil portion 32. The inner peripheral superconducting wire 32in can be connected by the first connecting member 33, and the first inner peripheral superconducting wire 31in disposed on the inner peripheral side in the first superconducting coil portion 31 and the second superconducting wire. The second outer peripheral side superconducting wire 32out disposed on the outer peripheral side in the coil portion 32 can be connected by the second connecting member 34. That is, the superconducting wire connected via the first connecting member 33 and the superconducting wire adjacent to the superconducting wire in the stacking direction and connected via the second connecting member 34 are connected to both connecting members 33, 34. Via the dislocation.

  FIG. 7 schematically shows how two superconducting wires (superconducting wire A and superconducting wire B) stacked adjacent to each other are dislocated using the first connecting member 33 and the second connecting member 34. FIG. Here, of the two superconducting wires stacked, the superconducting wire A includes a first outer superconducting wire 31out provided in the first superconducting coil portion 31 and a second inner periphery provided in the second superconducting coil portion 32. The side superconducting wire 32in, the 1st outer peripheral side superconducting wire 31out, and the 1st connection member 33 which connects the 2nd inner peripheral side superconducting wire 32in are provided. The superconducting wire B includes a first inner peripheral superconducting wire 31in provided in the first superconducting coil portion 31, a second outer superconducting wire 32out provided in the second superconducting coil portion 32, and a first inner peripheral superconducting wire. A second connecting member 34 is provided to connect the wire 31in and the second outer peripheral superconducting wire 32out.

  As shown in FIG. 7, the superconducting wire A and the superconducting wire B are wound in a state of being stacked adjacent to each other. Further, the superconducting wire A disposed on the outer peripheral side in the first superconducting coil portion 31 is dislocated (AB dislocation) at the intersection of the first connecting member 33 and the second connecting member 34. Thus, the second superconducting coil portion 32 is disposed on the inner peripheral side. Further, the superconducting wire B disposed on the inner peripheral side in the first superconducting coil portion 31 is dislocated (AB dislocation) at the intersection of the first connecting member 33 and the second connecting member 34. Thus, the second superconducting coil portion 32 is disposed on the outer peripheral side.

  As described above, according to this embodiment, the slits 33c and 34c (notches) are formed in the superconducting wires (superconducting wires A and B) stacked adjacent to each other, and the slits 33c and 34c are formed in the slits 33c and 34c. Thus, the superconducting wires arranged adjacent to each other in the stacking direction can be transposed by a simple configuration in which both the superconducting wires cross each other. When crossing both superconducting wires, one superconducting wire crosses the notch that forms the slit of the other superconducting wire. At this time, the superconducting wire is bent slightly to get over the notch. It is done. However, the bending direction is a direction perpendicular to the tape surface T of the superconducting wire, and the in-plane direction component of the superconducting wire is not included in the bending direction. Therefore, as in the prior art, it is possible to prevent the superconducting wire from being distorted by bending the superconducting wire in the in-plane direction in order to displace the superconducting wire.

  According to the present embodiment, the first connection member 33 and the second connection member 34 are Gd-based superconducting wires. Since the Gd-based superconducting wire has a current capacity (critical current value) more than double that of the Bi-based superconducting wire, even when slits are formed in the connecting members 33 and 34 made of such a material, the Bi-based superconducting material It is possible to secure a current capacity comparable to the current capacity in the portion (the superconducting wire constituting the first superconducting coil part 31 and the superconducting wire constituting the second superconducting coil part 32).

  As shown in FIG. 6, when the first connection member 33 and the second connection member 34 are overlapped, on one end side in the longitudinal direction from the portion X, on the outer surface 34 a of the second connection member 34, The first connection member 33 is stacked. In addition, an end portion of the first inner peripheral superconducting wire 31in is connected to the outer surface 34a on the one end side of the second connection member 34. In the present embodiment, a predetermined gap G1 is formed between the first connecting member 33 on the outer surface 34a on the one end side of the second connecting member 34 and the first inner peripheral superconducting wire 31in. By forming such a gap G1, interference in the longitudinal direction between the first inner peripheral superconducting wire 31in and the first connecting member 33 on the outer surface 34a on the one end side of the second connecting member 34 is prevented. By preventing interference in this way, an increase in thickness in the stacking direction can be suppressed.

  Similarly, as shown in FIG. 6, when the first connection member 33 and the second connection member 34 are overlapped with each other, on the outer surface 33 a of the first connection member 33 on the other end side in the longitudinal direction from the portion X. The second connection member 34 is laminated. In addition, an end portion of the second inner peripheral superconducting wire 32in is connected to the outer surface 33a on the other end side of the first connection member 33. In the present embodiment, a predetermined gap G2 is formed between the second connecting member 34 on the outer surface 33a on the other end side of the first connecting member 33 and the second inner peripheral superconducting wire 32in. By forming such a gap G2, interference in the longitudinal direction between the second inner peripheral superconducting wire 32in and the second connecting member 34 is prevented. By preventing interference in this way, an increase in thickness in the stacking direction can be suppressed.

  Further, according to the present embodiment, slits 33c and 33d (notches) are formed in each of the two superconducting wires A and B adjacent in the stacking direction, and the two superconducting wires A and B are formed. The slits 33c and 34c formed in each are fitted. By fitting the slits 33c and 34c formed with each other, the two superconducting wires A and B cross each other and are stacked along the stacking direction. Thereby, the increase in the length of the width direction (direction perpendicular to the length direction and the thickness direction) at the intersecting portion of the two superconducting wires A and B stacked can be suppressed.

  Further, according to the present embodiment, as shown in FIG. 3, the connecting members (33, 34) are connected to the first straight portion 3 a of the superconducting coil 3 at the portion where the first superconducting wire (31 out, 31 in) is connected. The portion where the second superconducting wire (32out, 32in) is connected is provided in the second linear portion 3b, and the portion where the slit (33c, 34c) is formed is provided in the first arc portion 3c. It is configured. Since the first superconducting wire (31out, 31in) and the second superconducting wire (32out, 32in) are connected to the connecting member (33, 34) at the straight portion of the superconducting coil 3, the connecting member and the first and second The connection with the superconducting wire can be easily performed, and the connection can be reliably performed. In addition, by forming the connecting member across one arc portion, the position of the inner peripheral end portion of the first superconducting coil portion 31 and the position of the inner peripheral end portion of the second superconducting coil portion 32 can be matched. it can. For this reason, the shape of the 1st superconducting coil part 31 and the shape of the 2nd superconducting coil part 32 can be made into a substantially symmetrical shape.

(Second embodiment)
Next, a second embodiment of the present invention will be described. In said 1st embodiment, the example in which the 1st superconducting coil part 31 and the 2nd superconducting coil part 32 were each comprised by the two superconducting wire laminated | stacked in the thickness direction was shown. In the present embodiment, an example in which the first superconducting coil portion 31 and the second superconducting coil portion 32 are each constituted by three superconducting wires stacked in the thickness direction will be described. Since other configurations are the same as those described in the first embodiment, description of the same parts is omitted.

  FIG. 8 is a front view of the first superconducting coil portion 31 and the second superconducting coil portion 32 constituting the superconducting coil 3 according to the present embodiment as viewed from the same winding direction. As shown in FIG. 8, the first superconducting coil portion 31 and the second superconducting coil portion 32 have substantially symmetric shapes with respect to a plane perpendicular to the winding axis direction. The first superconducting coil portion 31 is configured by winding three laminated tape-shaped Bi-based superconducting wires (width 4.6 mm). Similarly, the second superconducting coil portion 32 is configured by winding three laminated tape-shaped Bi-based superconducting wires (width 4.6 mm). A tape surface (main surface) T is formed on the superconducting wire constituting each superconducting coil portion. Then, three superconducting wires are laminated along the direction perpendicular to the tape surface T.

  One of the three superconducting wires (first superconducting wire) constituting the first superconducting coil portion 31 is always arranged on the outer peripheral side of the other two superconducting wires, and the other Any one superconducting wire is always arranged on the inner peripheral side of the other two superconducting wires, and the remaining one superconducting wire is always arranged between the other two superconducting wires. Similarly, any one of the three superconducting wires (second superconducting wire) constituting the second superconducting coil portion 32 is always arranged on the outer peripheral side of the other two superconducting wires, Any one other superconducting wire is always arranged on the inner peripheral side of the other two superconducting wires, and the remaining one superconducting wire is always arranged between the other two superconducting wires.

  Hereinafter, the superconducting wire disposed on the outermost peripheral side of the first superconducting wire constituting the first superconducting coil portion 31 is referred to as a first outer peripheral superconducting wire 31out, and the superconducting wire disposed on the innermost peripheral side is the first. A superconducting wire disposed between the first outer peripheral superconducting wire 31out and the first inner superconducting wire 31in is referred to as a first intermediate superconducting wire 31mid. Further, the superconducting wire disposed on the outermost peripheral side among the second superconducting wires constituting the second superconducting coil portion 32 is referred to as a second outer peripheral superconducting wire 32out, and the superconducting wire disposed on the most inner peripheral side is referred to as the second inner peripheral side. The superconducting wire disposed between the second outer peripheral superconducting wire 32out and the second inner superconducting wire 32in is referred to as a second intermediate superconducting wire 32mid. Further, the laminated first outer superconducting wire 31out, the first intermediate superconducting wire 31mid, and the first inner superconducting wire 31in are referred to as a first superconducting wire group 31T, and the laminated second outer superconducting wire 32out. The second intermediate superconducting wire 32mid and the second inner peripheral superconducting wire 32in are referred to as a second superconducting wire group 32T. Accordingly, the first superconducting coil portion 31 is configured by winding the first superconducting wire group 31T, and the second superconducting coil portion 32 is configured by winding the second superconducting wire group 32T. .

  The inner peripheral end of the first superconducting wire group 31T constituting the first superconducting coil portion 31 is the inner peripheral end of the first outer peripheral superconducting wire 31out, the inner peripheral end of the first intermediate superconducting wire 31mid, and the first It is comprised by the inner peripheral end part of the inner peripheral side superconducting wire 31in. Among these, the inner peripheral end of the first outer superconducting wire 31out is connected to the first connecting member 35, the inner peripheral end of the first intermediate superconducting wire 31mid is connected to the intermediate connecting member 36, and the first inner peripheral side The inner peripheral end of the superconducting wire 31in is connected to the second connecting member 37. Further, the inner peripheral end of the second superconducting wire group 32T constituting the second superconducting coil portion 32 is an inner peripheral end of the second outer peripheral superconducting wire 32out, an inner peripheral end of the second intermediate superconducting wire 32mid, and It is comprised by the inner peripheral end part of the 2nd inner peripheral side superconducting wire 32in. Among these, the inner peripheral end of the second outer superconducting wire 32out is connected to the second connecting member 37, the inner peripheral end of the second intermediate superconducting wire 32mid is connected to the intermediate connecting member 36, and the second inner peripheral side. The superconducting wire 32in is connected to the first connecting member 35.

  FIG. 9 is a schematic perspective view of the developed first connection member 35, intermediate connection member 36, and second connection member 37. As shown in FIG. 9, the first connecting member 35 is formed in a long flat plate shape having an outer surface 35a and an inner surface 35b opposite to the outer surface 35a. The intermediate connecting member 36 is formed in a long flat plate shape having an outer surface 36a and an inner surface 36b opposite to the outer surface 36a. The second connection member 37 is formed in a long flat plate shape having an outer surface 37a and an inner surface 37b opposite to the outer surface 37a.

  The inner peripheral end portion of the first outer peripheral superconducting wire 31out is connected to the outer surface 35a on one end portion side in the longitudinal direction of the first connection member 35 by soldering, and the other end portion in the longitudinal direction of the first connection member 35 is connected. The inner peripheral end of the second inner peripheral superconducting wire 32in is connected to the outer surface 35a. The first intermediate superconducting wire 31mid is connected to the outer surface 36a at one end in the longitudinal direction of the intermediate connecting member 36, and the second intermediate superconducting wire 32mid is connected to the outer surface 36a at the other end in the longitudinal direction of the intermediate connecting member 36. Are connected to the inner peripheral end. The inner peripheral end of the first inner peripheral superconducting wire 31in is connected to the outer surface 37a of one end in the longitudinal direction of the second connecting member 37, and the other end in the longitudinal direction of the second connecting member 37 is connected. An inner peripheral end portion of the second outer peripheral superconducting wire 32out is connected to the outer surface 37a.

  Slits 35c (notches) and slits 35d (notches) are formed at two different positions in the longitudinal direction of the first connecting member 35. The slit 35c and the slit 35d open on one side of the first connecting member 35, and extend from the opening portion in a direction perpendicular to the longitudinal direction. In addition, slits 36 c (notches) and slits 36 d (notches) are formed at two different positions in the longitudinal direction of the intermediate connecting member 36. The slit 36c opens on one side of the intermediate connection member 36, and extends from the opening portion in a direction perpendicular to the longitudinal direction. The slit 36d opens on the other side of the intermediate connecting member 36, and extends from the opening portion in a direction perpendicular to the longitudinal direction. In addition, slits 37c (notches) and slits 37d (notches) are formed at two different positions in the longitudinal direction of the second connecting member 37. The slit 37c and the slit 37d open on one side of the second connecting member 37, and extend from the opening portion in a direction perpendicular to the longitudinal direction.

  The first connecting member 35, the intermediate connecting member 36, and the second connecting member 37 are laminated adjacently along the thickness direction at the inner peripheral wall portion of the superconducting coil 3 as shown in FIG. At this time, these connection members are laminated so that the outer surface 35a of the first connection member 35, the outer surface 36a of the intermediate connection member 36, and the outer surface 37a of the second connection member 37 face the same direction.

  Moreover, the 1st connection member 35, the intermediate | middle connection member 36, and the 2nd connection member 37 are engaged so that it may become intertwined by the fitting of the slit formed in each in the laminated state. Specifically, the slit 35 c formed in the first connection member 35 and the slit 37 d formed in the second connection member 37 are fitted to each other, and the slit 35 d formed in the first connection member 35 and the intermediate connection member 36 are formed. The connecting members 35, 36, and 37 are engaged with each other so that the slit 36 d thus fitted fits, and the slit 36 c formed on the intermediate connecting member 36 and the slit 37 c formed on the second connecting member 37 fit. In other words, a slit that opens at a predetermined position on the side of each connection member 35, 36, 37 is formed so that the above-described fitting of the slits is realized. When the connection members 35, 36, and 37 are engaged with each other by fitting the slits, the connection members 35, 36, and 37 are stacked along the thickness direction.

  Moreover, when each connection member 35,36,37 is engaged as mentioned above, each superconducting wire (first outer peripheral side superconducting wire rod) connected to one end of each connection member 35,36,37, respectively. 31out, first intermediate superconducting wire 31mid, first inner peripheral superconducting wire 31in) are laminated in the thickness direction. Similarly, when each connection member 35, 36, 37 is engaged, each superconducting wire connected to the other end of each connection member 35, 36, 37 (second outer peripheral superconducting wire 32out, second The second intermediate superconducting wire 32mid and the second inner peripheral superconducting wire 32in) are laminated in the thickness direction.

  FIG. 10 is a cross-sectional view showing a state in which the first connection member 35, the intermediate connection member 36, and the second connection member 37 are engaged from the direction perpendicular to the stacking direction and the longitudinal direction. As shown in FIG. 10, the connection members 35, 36, and 37 engage with each other so as to be intertwined with each other and are stacked along the thickness direction. Further, the slit 36c formed in the intermediate connecting member 36 and the slit 37c formed in the second connecting member 37 are fitted in the part H1 in FIG. 10, and the first connecting member 35 is formed in the part H2. The slit 37c and the slit 37d formed in the second connecting member 37 are fitted, and the slit 35d formed in the first connecting member 35 and the slit 36d formed in the intermediate connecting member 36 are fitted in the portion H3.

  10, the upper side is defined as the outer peripheral side and the lower side is defined as the inner peripheral side, and the left side of the left and right direction (that is, the longitudinal direction of each connecting member) is defined as one side. When the end side and the right side are defined as the other end side, among the portions H1, H2, and H3, the portion H1 is on the side (one end side) to which the first superconducting wire group 31T is connected in the longitudinal direction. It is provided at the closest position, that is, the leftmost side in FIG. Further, the portion H3 is provided at a position closest to the side (the other end side casting) to which the second superconducting wire group 32T is connected in the longitudinal direction, that is, the rightmost side in FIG. The part H2 is provided between the part H1 and the part H3 in the longitudinal direction.

  Further, in the portion closer to one end side than the part H1, the stacking order of the connection members 35, 36, and 37 is the first connection member 35, the intermediate connection member 36, the first connection order from the outer peripheral side toward the inner peripheral side. The two connecting members 37 are arranged in this order.

  In addition, when the slit 36c and the slit 37c are fitted in the part H1, the intermediate connection member 36 and the second connection member 37 intersect each other. Thereby, the stacking order of the intermediate connection member 36 and the second connection member 37 is switched. Therefore, the stacking order of the connection members 35, 36, and 37 in the portion between the portion H1 and the portion H2 is the first connection member 35, the second connection member 37, and the intermediate connection member 36 from the outer peripheral side toward the inner peripheral side. In the order.

  Further, the first connecting member 35 and the second connecting member 37 intersect each other by fitting the slit 35c and the slit 37d at the portion H2. Thereby, the stacking order of the first connection member 35 and the second connection member 37 is switched. Therefore, the stacking order of the connection members 35, 36, and 37 in the portion between the portion H2 and the portion H3 is the second connection member 37, the first connection member 35, and the intermediate connection member 36 from the outer peripheral side toward the inner peripheral side. In the order.

  Then, the first connecting member 35 and the intermediate connecting member 36 intersect each other by fitting the slit 35d and the slit 36d at the portion H3. Thereby, the stacking order of the first connection member 35 and the intermediate connection member 36 is switched. Therefore, in the portion closer to the other end side than the part H3, the stacking order of the connection members 35, 36, 37 is the second connection member 37, the intermediate connection member 36, the first connection order from the outer peripheral side toward the inner peripheral side. One connecting member 35 is arranged in this order.

  Thus, the 1st connection member 35, the intermediate | middle connection member 36, and the 2nd connection member 37 cross | intersect by the fitting of the slit currently formed in each, One end side of each connection member 35,36,37 The stacking order of the connection members 35, 36, and 37 and the stacking order of the connection members 35, 36, and 37 on the other end side of the connection members 35, 36, and 37 change. For this reason, the superconducting wire disposed on the inner peripheral side in the first superconducting coil portion 31 (first inner peripheral superconducting wire 31in) is disposed on the outer peripheral side in the second superconducting coil portion 32. Can be connected to the superconducting wire (the second outer peripheral superconducting wire 32out), and the superconducting wire (the first outer superconducting wire 31out) disposed on the outer peripheral side in the first superconducting coil portion 31. Can be connected to the superconducting wire disposed on the inner peripheral side in the second superconducting coil portion 32 (second inner peripheral superconducting wire 32in). That is, the superconducting wire constituting the superconducting coil 3 is dislocated through the connection members 35, 36, and 37.

  FIG. 11 is a schematic view of the dislocation of three stacked superconducting wires (superconducting wires A, B, and C) using the first connecting member 35, the intermediate connecting member 36, and the second connecting member 37. FIG. Here, among the three superconducting wires stacked, the superconducting wire A is a first outer superconducting wire 31out provided in the first superconducting coil portion 31 and a second inner periphery provided in the second superconducting coil portion 32. The side superconducting wire 32in, the 1st outer peripheral side superconducting wire 31out, and the 1st connection member 35 which connects the 2nd inner peripheral side superconducting wire 32in are provided. The superconducting wire B includes a first intermediate superconducting wire 31mid provided in the first superconducting coil part 31, a second intermediate superconducting wire 32mid provided in the second superconducting coil part 32, a first intermediate superconducting wire 31mid and a second. And an intermediate connection member 36 for connecting the intermediate superconducting wire 32mid. The superconducting wire C includes a first inner superconducting wire 31in provided in the first superconducting coil portion 31, a second outer superconducting wire 32out provided in the second superconducting coil portion 32, and a first inner superconducting wire. A second connecting member 37 is provided to connect the wire 31in and the second outer peripheral superconducting wire 32out.

  As shown in FIG. 11, the superconducting wire C arranged on the inner peripheral side in the first superconducting coil portion 31 is dislocated (BC dislocation) with the superconducting wire B at the portion H1, thereby superconducting. It is disposed between the wire A and the superconducting wire B, and is further disposed on the outer peripheral side by being dislocated (AC dislocation) with the superconducting wire A at the portion H2. Accordingly, the superconducting wire C is disposed on the outer peripheral side in the second superconducting coil portion 32. Further, the superconducting wire A disposed on the outer peripheral side in the first superconducting coil portion 31 is dislocated (AC dislocation) with the superconducting wire C at the portion H2, thereby superconducting wire B and superconducting wire C. Furthermore, it is arranged on the inner peripheral side by dislocation (AB dislocation) with the superconducting wire B at the portion H3. Therefore, the superconducting wire A is disposed on the inner peripheral side in the second superconducting coil portion 32. In addition, the superconducting wire B disposed between the superconducting wire A and the superconducting wire C in the first superconducting coil portion 31 is dislocated (BC dislocation) with the superconducting wire C at the portion H1. Further, it is disposed between the superconducting wire A and the superconducting wire C again by dislocation (AB dislocation) with the superconducting wire A at the portion H3. Therefore, the superconducting wire B is disposed between the superconducting wire A and the superconducting wire C even in the second superconducting coil portion 32.

  Thus, in this embodiment, each superconducting wire can be dislocated with a simple configuration even in a superconducting coil manufactured using three superconducting wires.

(Third embodiment)
In the first embodiment, an example in which slits (33c, 34d) as notches are formed in the first connection member 33 and the second connection member 34 has been described. An example in which a crank-shaped notch is formed in the second connecting member 34 will be described. FIG. 12 is a schematic plan view showing the first connection member 33 and the second connection member 34 according to the third embodiment. As shown in FIG. 12, notch step portions 33e and 34e are formed at substantially the center portions of the first connection member 33 and the second connection member 34 according to the present embodiment, respectively. The notch step portions 33e and 34e extend along a direction perpendicular to the longitudinal direction of the connection members 33 and 34, respectively. The first connecting member 33 is formed with a narrow portion and a wide portion along the longitudinal direction with the notch step portion 33e as a boundary. Similarly, the second connecting member 34 is formed with a narrow portion and a wide portion along the longitudinal direction with the notch step portion 34e as a boundary. That is, the first connecting member 33 and the second connecting member 34 are formed with crank-shaped notches. Moreover, in this embodiment, the 1st connection member 33 and the 2nd connection member 34 are comprised with copper. Moreover, the thickness of both the 1st connection member 33 and the 2nd connection member 34 is 1 mm, and can be bent easily. Since the other configuration is the same as that of the first embodiment, description thereof is omitted.

  Further, as can be seen from FIG. 12, both connecting members 33, 33 are formed so that the notch step portion 33e formed in the first connection member 33 and the notch step portion 34e formed in the second connection member 34 face each other. 34 are superimposed. And the 1st connection member 33 and the 2nd connection member 34 are engaged by fitting the notch level | step-difference part 33e, 34e of a crank shape. At this time, the first connection member 33 gets over the notch step portion 34e of the second connection member 34, and the second connection member 34 gets over the notch step portion 33e of the first connection member 33. 33 and 34 intersect. By such an intersection, the superconducting wire including the first connecting member 33 and the superconducting wire including the second connecting member 34 are dislocated.

  As described above, the superconducting wire can be easily displaced by providing the connecting member with the crank-shaped notch.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described. In the present embodiment, modified examples of slits formed in the first connection member 35 and the second connection member 37 shown in the second embodiment will be described. FIG. 13 is a schematic plan view showing the first connection member 35, the intermediate connection member 36, and the second connection member 37 according to the fourth embodiment. As shown in FIG. 13, the first connection member 35 is formed with one wide slit 35 e, and the second connection member 37 is also formed with one wide slit 37 e. The slit 35e has one notch step 35f and the other notch step 35g, and the slit 37e has one notch step 35f and the other notch step 37g. Further, in the intermediate connection member 36, two slits 36c and 36d are formed as in the second embodiment. One notch step 35f of the slit 35e serves as the slit 35c in the second embodiment, and the other notch step 35g serves as the slit 35d in the second embodiment. One notch step 37f of the slit 37e serves as the slit 37c in the second embodiment, and the other notch step 37g serves as the slit 37d in the second embodiment.

  The wide slit 35e formed in the first connection member 35 is fitted into the wide slit 37e formed in the second connection member 37 at one notch step portion 35f, and the other notch step is formed. The portion 35g is fitted into a slit 36d formed in the intermediate connection member 36. The wide slit 37e formed in the second connection member 37 is fitted into the slit 36c formed in the intermediate connection member 36 at one notch step portion 37f, and the other notch step portion. At 37 g, the first connecting member 35 is fitted into a wide slit 35e.

  In this way, a wide slit is formed in the connecting member, and by fitting separate connecting members into one notch stepped portion and the other notched stepped portion constituting the slit, the slit forming portion is formed. Can be reduced.

(Fifth embodiment)
FIG. 14 is a plan view of the first connection member 35, the intermediate connection member 36, and the second connection member 37 according to the fifth embodiment, and a diagram showing a dislocation state of these connection members. As shown in FIG. 14, in the present embodiment, the first connecting member 35 is formed with a slit 35 c and a slit 35 d as in the second embodiment. On the other hand, one slit 36 h is formed in the intermediate connection member 36, and one slit 37 h is formed in the second connection member 37. The slit 36 h of the intermediate connection member 36 is fitted into the slit 35 c of the first connection member 35. Thereby, the superconducting wire A including the first connecting member 35 and the superconducting wire B including the intermediate connecting member 36 are dislocated (AB dislocation). Further, the slit 37 h of the second connection member 37 is fitted into the slit 35 d of the first connection member 35. Thereby, the superconducting wire A including the first connecting member 35 and the superconducting wire C including the second connecting member 37 are dislocated (AC dislocation).

  Therefore, as shown in FIG. 14, when the stacking order of the superconducting wires A, B, C is purely A, B, C from the outer peripheral side in the first superconducting coil portion 31, the AB dislocation described above. And in the 2nd superconducting coil part 32, a lamination order can also be made into B, C, A in order from an outer peripheral side by AC dislocation.

(Sixth embodiment)
FIG. 15 is a plan view of a plurality of connecting members according to the sixth embodiment, and a diagram showing a dislocation state of these connecting members. As shown in FIG. 15, in this embodiment, four laminated superconducting wires A, B, C, and D are dislocated. The superconducting wire A has a first superconducting wire A1, a second superconducting wire A2, and a first connecting member A3 that connects the first superconducting wire A1 and the second superconducting wire A2. The superconducting wire B has a first superconducting wire B1, a second superconducting wire B2, and a second connecting member B3 that connects the first superconducting wire B1 and the second superconducting wire B2. The superconducting wire C includes a first superconducting wire C1, a second superconducting wire C2, and a third connecting member C3 that connects the first superconducting wire C1 and the second superconducting wire C2. The superconducting wire D includes a first superconducting wire D1, a second superconducting wire D2, and a fourth connecting member D3 that connects the first superconducting wire D1 and the second superconducting wire D2.

  Each of the first superconducting wires A1, B1, C1, and D1 and each of the second superconducting wires A2, B2, C2, and D2 is made of an yttrium-based superconducting material and has a width of 5 mm. Moreover, each connection member A3, B3, C3, D3 is comprised with the yttrium-type superconducting material, and the width | variety is 12 mm.

  By winding the first superconducting wires A1, B1, C1, and D1 in a stacked state, the first superconducting coil portion CO1 is configured. Further, the second superconducting coil portion CO2 is configured by winding the second superconducting wires A2, B2, C2, and D2 in a stacked state. Then, the first superconducting coil part CO1 and the second superconducting coil part CO2 are arranged along the winding axis direction to form a double pancake type superconducting coil.

  The connecting member A3 has two slits A4 and A5 formed at different positions in the longitudinal direction, and the connecting member B3 has two slits B4 and B5 formed at different positions in the longitudinal direction, The connecting member C3 has two slits C4 and C5 formed at different positions in the longitudinal direction, and the connecting member D3 has two slits D4 and D5 formed at different positions in the longitudinal direction.

Each superconducting wire is dislocated by fitting the slits formed in each connecting member to the slits formed in the other connecting members at four positions. In the example shown in FIG. 15, the slit B4 formed in the connection member B3 is fitted into the slit C4 formed in the connection member C3, and the slit A4 formed in the connection member A3 is inserted into the slit C5 formed in the connection member C3. The slits B5 formed in the connecting member B3 are fitted in the slits D4 formed in the connecting member D3, and the slits A5 formed in the connecting member A3 are fitted in the slits D5 formed in the connecting member D3.

  By fitting the slits in this way, the four superconducting wires A, B, C, D are dislocated. In the present embodiment, the stacking order of the superconducting wires in the first superconducting coil portion 31 is the order of the superconducting wires A, B, C, D from the outer peripheral side to the inner peripheral side, but the second superconducting coil portion 32. The superconducting wires are stacked in the order of superconducting wires C, D, A, B from the outer peripheral side to the inner peripheral side. Thus, even in a superconducting coil in which four or more superconducting wires are laminated, a plurality of superconducting wires can be easily dislocated.

  As mentioned above, although embodiment of this invention was described, this invention should not be limited to the said embodiment.

  For example, in the first embodiment and the third embodiment, a connection member is provided at a connection portion between the first superconducting coil portion 31 and the second superconducting coil portion 32, and each superconducting coil portion 31 is used by using this connection member. , 32 is shown as an example of dislocation of the superconducting wire. However, such a dislocation of the superconducting wire is not limited to the connection portion of the two superconducting coil portions, and can be performed at an arbitrary position. For example, as shown in FIG. 16, in a superconducting coil CO formed by winding a plurality of laminated superconducting wires (two in FIG. 16), any of a plurality of superconducting wires wound in a laminated state A notch (for example, a slit) is formed in each superconducting wire at the location (location Z in FIG. 16), and a plurality of superconducting wires are formed inside the superconducting coil CO by fitting the formed notches into each other. It can also be rearranged.

  Moreover, in the said embodiment, although the example which transposed | superposed the superconducting wire connected to those connection members by fitting the slits each formed in the some connection member was shown, Of the superconducting wires which were laminated | stacked, It suffices that at least one of them has a notch such as a slit.

  In the above-described embodiment, an example in which the connection member is formed of a superconducting material or copper is shown. However, the connection member may be made of a conductive metal material. Further, the connecting member may be configured using both a superconductor and a conductive material. When the connecting member is composed only of metal, there is a problem that the electrical resistance of the connecting member is large. On the other hand, when the connecting member is composed only of the superconductor, the superconducting breakdown (when excessive current flows through the connecting member) Quench) may occur. On the other hand, the above-described drawbacks can be compensated by using a conductive metal such as copper and a superconductor in combination as a material constituting the connection member. That is, the electric resistance of the connecting member can be reduced by the current flowing through the portion formed of the superconductor during normal operation (when an appropriate current is flowing). Further, when an excessive current flows, the excessive current flows through a portion made of metal. For this reason, the superconducting destruction of the part comprised by the superconductor can be prevented.

  In addition, as shown in FIG. 17, two superconducting wires E1, each having a notch (for example, a slit) formed in the superconducting wire (or connecting member) with a gap in the longitudinal direction. Each facing end portion of E2 may be formed by connecting with a conductor F having a width narrower than the widths of the two superconducting wires E1 and E2. According to this, a notch part can be easily formed in a superconducting wire (connecting member).

  Moreover, you may connect an auxiliary conductor to the part in which the notch part (for example, slit etc.) is formed among superconducting wires (or connection member). According to this, it is possible to prevent a decrease in the amount of current due to a decrease in the flow path cross-sectional area of the current in the portion where the notch is formed. Thus, the present invention can be modified without departing from the gist thereof.

DESCRIPTION OF SYMBOLS 1 ... Superconducting rotary electric machine stator, 2 ... Stator core, 2a ... Back yoke, 2b ... Teeth, 2c ... Slot, 3 ... Superconducting coil, 3a ... First straight part, 3b ... Second straight part, 3c ... First arc part, 3d ... 2nd circular arc part, 31 ... 1st superconducting coil part, 31T ... 1st superconducting wire group, 31in ... 1st inner periphery side superconducting wire, 31mid ... 1st intermediate superconducting wire, 31out ... 1st outer periphery superconducting wire, 32 ... 2nd superconducting coil part, 32T ... 2nd superconducting wire group, 32in ... 2nd inner periphery side superconducting wire, 32mid ... 2nd intermediate superconducting wire, 32out ... 2nd outer periphery side superconducting wire, 33 ... 1st connection member, 33a ... outer surface, 33b ... inner surface, 33c ... first slit (notch), 33e ... stepped portion (notch), 34 ... second connecting member, 34a ... outer surface, 34b ... inner surface, 34c ... second slit (cut) ), 34e: stepped portion (notched portion), 35: first connecting member, 35a: outer surface, 35b ... inner surface, 35c: slit (notched portion), 35d: slit (notched portion), 35e: slit (Notch part), 35f, 35g ... step part (notch part), 36 ... intermediate connection member, 36a ... outer surface, 36b ... inner surface, 36c ... slit (notch part), 36d ... slit (notch part), 36h ... slit (notch), 37 ... second connecting member, 37a ... outer surface, 37b ... inner surface, 37c ... slit (notch), 37d ... slit (notch), 37e ... slit (notch) , 37f, 37g ... step (notch), 37h ... slit (notch), A, B, C, D ... superconducting wire, A1, B1, C1, D1 ... first superconducting wire, A2, B2, C2, D2 ... Second superconducting wire, A3 First connection member, A4, A5 ... slit (notch), B3 ... second connection member, B4, B5 ... slit (notch), C3 ... third connection member, C4, C5 ... slit (notch) ), D3 ... fourth connection member, D4, D5 ... slit (notch), G1 ... gap, G2 ... gap, T ... tape surface

Claims (11)

A superconducting coil configured by winding a plurality of laminated superconducting wire rods,
At least one superconducting wire of the plurality of superconducting wires is formed with a notch cut along a direction including a direction component perpendicular to the longitudinal direction,
When the superconducting wire adjacent to the superconducting wire in which the notch is formed extends in the stacking direction, the superconducting wire in which the notch is formed at the notch and the superconducting wire. A superconducting coil in which superconducting wires adjacent to each other are crossed. The superconducting coil according to claim 1,
The superconducting coil in which the notch is formed in each of the superconducting wires adjacent in the stacking direction, and the notch formed in each of the superconducting wires is fitted to each other. The superconducting coil according to claim 1 or 2,
The notch portion connects the facing ends of the two superconducting wires arranged with a gap along the longitudinal direction with a conductor having a width narrower than the width of the two superconducting wires. A superconducting coil that is formed by The superconducting coil according to any one of claims 1 to 3,
A superconducting coil in which an auxiliary conductor is connected to a portion of the superconducting wire having the notch formed therein, the width of which is narrowed by the formation of the notch. The superconducting coil according to any one of claims 1 to 4,
A first superconducting coil portion formed by winding a plurality of first superconducting wires made of a superconducting material in a stacked state;
A second superconducting coil portion formed by winding a plurality of second superconducting wires made of a superconducting material in a stacked state; and
An inner peripheral end portion of each of the first superconducting wires constituting the first superconducting coil portion is connected to an inner peripheral end portion of each of the second superconducting wire constituting the second superconducting coil portion. A plurality of connecting members,
The first superconducting coil part and the second superconducting coil part are arranged so as to be stacked along the winding axis direction,
The plurality of connection members are arranged in layers on the inner circumference of the first superconducting coil part and the second superconducting coil part,
A superconducting coil in which the notch is formed in at least one of the plurality of connection members arranged in a stacked manner. The superconducting coil according to claim 5, wherein
A superconducting coil in which the shape of the notch is a crank shape. The superconducting coil according to claim 5 or 6,
A superconducting coil in which the connecting member is made of a conductive metal. The superconducting coil according to claim 5 or 6,
A superconducting coil in which the connecting member is composed of a superconductor. The superconducting coil according to claim 5 or 6,
A superconducting coil in which the connecting member has a portion made of a conductive metal and a portion made of a superconductor. The superconducting coil according to any one of claims 5 to 9,
The superconducting coil includes a first linear portion and a second linear portion that are arranged to face each other, a first arc portion that connects one end of the first linear portion and one end of the second linear portion, A racetrack shape having a second arc portion connecting the other end portion of the straight portion and the other end portion of the second straight portion;
The connecting member includes a portion where the first superconducting wire is connected to the first straight portion, a portion where the second superconducting wire is connected to the second straight portion, and the cutout portion. Is formed so that the portion where the is formed is provided in the first arc portion. Superconducting coil. A stator core having teeth;
A superconducting coil according to claim 1,
A superconducting rotating electrical machine stator, wherein the superconducting coil is wound around the teeth.

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