JP5534712B2 - High temperature superconducting pancake coil and high temperature superconducting coil - Google Patents

Description

  The present invention relates to a high temperature superconducting pancake coil and a high temperature superconducting coil.

  The high temperature superconducting coil is usually produced by winding a tape-shaped high temperature superconducting wire. In general, a wound high-temperature superconducting wire is impregnated with a resin such as an epoxy resin in order to maintain the wound shape or to improve heat transfer in a vacuum.

  In recent years, what is called a second generation wire has been manufactured as a high-temperature superconducting wire. In this second generation wire, for example, an intermediate layer such as cerium oxide is formed on a tape-shaped metal substrate such as Hastelloy (registered trademark), and an yttrium-based oxide having a thickness of about several μm is formed on the intermediate layer. An object superconducting layer is formed.

  However, in this second generation wire, the oxide superconducting layer and the intermediate layer are easily peeled off from the surrounding layers, and the superconducting properties are deteriorated by this peeling. For this reason, when a high-temperature superconducting coil is produced using a high-temperature superconducting wire that is a second generation wire, if the wound high-temperature superconducting wire is impregnated with a resin such as an epoxy resin, the resin is cured by shrinkage or the thermal stress during cooling. Therefore, there is a problem that the oxide superconducting layer and the intermediate layer are easily separated from the surrounding layers.

  On the other hand, for example, in Patent Document 1 (Japanese Patent Laid-Open No. 2008-243588), when a high temperature superconducting wire and a release material tape are wound together, a release force is generated inside the coil. A method is disclosed in which the peeling force acting on the high-temperature superconducting layer is relaxed by peeling at the material tape portion.

JP 2008-243588 A

  However, the method of co-winding the release material tape as in Patent Document 1 cannot completely eliminate the possibility of the peeling force acting on the high-temperature superconducting layer due to curing shrinkage due to resin impregnation and thermal stress during cooling. . For this reason, in the method of Patent Document 1, when the high-temperature superconducting wire is a wire that is very weak against the peeling force, there is a problem that the characteristics of the manufactured coil may be deteriorated.

  The present invention has been made in view of the above circumstances, and a high-temperature superconducting pancake coil that does not deteriorate superconducting characteristics even when manufactured using a high-temperature superconducting wire having a high-temperature superconducting layer that easily peels, and this pancake coil An object is to provide a high-temperature superconducting coil used.

  The present invention relates to a pancake coil formed in a pancake shape by winding a high-temperature superconducting wire, and at least part of the winding side surfaces constituting a pair of end faces in the axial direction is covered with a resin layer. It was completed by finding that a high-temperature superconducting pancake coil whose characteristics do not deteriorate can be obtained.

The high-temperature superconducting pancake coil according to the present invention solves the above-mentioned problems, and uses a tape-shaped high-temperature superconducting wire formed by sequentially forming an intermediate layer and an oxide superconducting layer on the surface of a metal substrate. In the pancake coil formed in a pancake shape having a space that penetrates the center in the axial direction by winding the superconducting wire, the turns of the wound high-temperature superconducting wire are not fixed with a resin layer and at least a portion of the winding side portion constituting the end faces of the pair of axial direction is covered with tree fat layer, further the heat transfer member on the surface of the resin layer is characterized in that it is fixed.

The high-temperature superconducting coil according to the present invention solves the above-mentioned problems, and the high-temperature superconducting pancake coils are stacked, the pancake coils are electrically connected, and the heat transfer member is directly or directly connected. It is characterized in that it is thermally connected to the cooling means via another heat transfer member .

  Even when the high-temperature superconducting pancake coil and the high-temperature superconducting coil according to the present invention are manufactured using a high-temperature superconducting wire having a high-temperature superconducting layer that is easily peeled off, the superconducting characteristics do not deteriorate.

It is a figure which shows 1st Embodiment of the pancake coil of this invention, (a) is sectional drawing cut | disconnected along the axial direction of a pancake coil, (b) is a principal part expanded sectional view of (a), c) The expanded sectional view of a part of pancake coil shown in (b). The expanded sectional view of the 1st modification of 1st Embodiment of the pancake coil of this invention. The expanded sectional view of the 2nd modification of 1st Embodiment of the pancake coil of this invention. The expanded sectional view of the 3rd modification of 1st Embodiment of the pancake coil of this invention. The expanded sectional view of the 4th modification of 1st Embodiment of the pancake coil of this invention. It is a figure which shows 2nd Embodiment of the pancake coil of this invention, (a) is sectional drawing cut | disconnected along the axial direction of a pancake coil, (b) is a principal part expanded sectional view of (a), c) The expanded sectional view of the other part of the pancake coil shown to (a). It is a figure which shows 3rd Embodiment of the pancake coil of this invention, (a) is the perspective view which cut | disconnected a part of pancake coil along the axial direction, (b) is the pancake coil shown to (a) FIG. Sectional drawing of the high temperature superconducting coil of this invention.

<Pancake coil>
A pancake coil according to the present invention will be described with reference to the drawings.

[First Embodiment]
FIG. 1 is a diagram showing a first embodiment of a pancake coil according to the present invention. Specifically, FIG. 1A is a cross-sectional view taken along the axial direction of a pancake-shaped pancake coil having a cylindrical space at the axial center, and FIG. 1B is a cross-sectional view of FIG. FIG. 1C is an enlarged sectional view of a part of the pancake coil shown in FIG. 1B.

  The pancake coil 1 shown in FIG. 1A has a space 35 penetrating the axial center of the pancake coil 1 by winding a tape-like high-temperature superconducting wire 20 as shown in FIG. It is the coil formed in the shape of a pancake having. The pancake coil 1 is a so-called single pancake coil formed in a single pancake shape. Although FIG. 1 shows a single pancake coil, the present invention may be a so-called double pancake coil formed in the shape of two pancakes.

  The pancake coil 1 includes an inner peripheral surface 15 facing the space 35, an outer peripheral surface 16, and a pair of ring-shaped winding side surfaces 12 </ b> A and 12 </ b> B that constitute a pair of end surfaces in the axial direction. The winding side surfaces 12A and 12B are gathered at both ends in the width direction of the wound high-temperature superconducting wire 20 and the co-winding tape co-wound with the high-temperature superconducting wire 20, and are further covered with a cured resin layer It is formed into a planar shape by, for example.

  The high temperature superconducting wire 20 is usually wound so as to start winding from the inner peripheral surface 15 side and finish winding on the outer peripheral surface 16. Hereinafter, the portion from the first turn to the several turns of the high temperature superconducting wire 20 that starts winding the high temperature superconducting wire 20 is referred to as a winding start portion 17. Further, the portion from the last one turn to several turns before the end of winding of the high temperature superconducting wire 20 is referred to as a winding end portion 18. Further, a portion of the wound high-temperature superconducting wire 20 excluding the winding start portion 17 and the winding end portion 18 is referred to as a winding intermediate portion 19. Further, a portion including the winding start portion 17, the winding intermediate portion 19 and the winding end portion 18 is referred to as a winding portion 11.

  FIG. 1B is an enlarged cross-sectional view of a winding portion 110 that is a part of the winding portion 11. As shown in FIG. 1B, the high-temperature superconducting wire 20 is usually wound together with an insulating tape 51 as a co-winding tape 50 for insulation between adjacent turns. As the insulating tape 51, for example, Kapton is used.

  If the high-temperature superconducting wire 20 is insulated with formal coating or kapton coating, the insulating tape 51 can be deleted, and a metal tape is used as a reinforcing material instead of the insulating tape 51. It is also possible to do.

  As shown in FIGS. 1A and 1B, the high-temperature superconducting wire 20 wound together with the insulating tape 51 is wound with a winding side surface portion 12A composed of one end in the width direction of the high-temperature superconducting wire 20. And the winding side surface part 12B which consists of the other end of the width direction of the high temperature superconducting wire 20 is formed.

  A resin layer 30 is formed on the surfaces of the winding side surface portion 12A and the winding side surface portion 12B. The winding side surface portion 12 </ b> A is connected to the heat transfer plate 40 through the resin layer 30 and the insulating plate 45.

  The resin layer 30 is a layer made of a cured resin such as an epoxy resin. The resin layer 30 maintains the shape of the coil around which the high temperature superconducting wire 20 and the insulating tape 51 are wound. The resin layer 30 also acts as a heat transfer path that guides the heat generated in the high-temperature superconducting wire 20 to the heat transfer plate 40. Since the resin layer 30 also acts as a heat transfer path, the pancake coil 1 can be easily cooled even in a vacuum.

  The resin layer 30 is not formed between the high temperature superconducting wire 20 and the insulating tape 51. For this reason, even when a force F that separates the high-temperature superconducting wire 20 and the insulating tape 51 is applied when the pancake coil 1 is cooled or when electromagnetic force is applied, the peeling force is not transmitted to the high-temperature superconducting wire 20. There is substantially no possibility that the inner layers of the high-temperature superconducting wire 20 having the structure are peeled off.

  Here, the high-temperature superconducting wire 20 having a multilayer structure will be described. As shown in FIG. 1C, the high-temperature superconducting wire 20 has a laminated structure in which an intermediate layer 22, an oxide superconducting layer 23, and a protective layer 24 are sequentially formed on the surface of a tape-shaped metal substrate 21, and this laminated It has a multilayer structure in which the entire object is covered with the stabilization layer 25. Although FIG. 1C shows a configuration in which the protective layer 24 and the stabilization layer 25 are provided, the high-temperature superconducting wire 20 used in the present invention has at least one of the protective layer 24 and the stabilization layer 25. It can also be set as the structure which is not formed.

  As the metal substrate 21, for example, a tape made of nickel alloy such as Hastelloy (registered trademark), stainless steel or the like is used.

  The intermediate layer 22 is a layer that promotes the crystal growth of the oxide of the oxide superconducting layer 23 formed on the surface. As the intermediate layer 22, for example, a layer made of cerium oxide, magnesium oxide, yttrium oxide, or the like is used.

  The oxide superconducting layer 23 is a layer that develops superconductivity. As the oxide superconducting layer 23, for example, a layer mainly composed of a rare earth oxide such as yttrium or a high-temperature superconducting material such as Re123 is used.

  The protective layer 24 is a layer that protects the oxide superconducting layer 23. As the protective layer 24, for example, a layer made of silver, gold, or an alloy thereof is used. The high-temperature superconducting material of the oxide superconducting layer 23 is generally an active material that easily reacts with other metals. Therefore, when it is brought into direct contact with a metal other than gold, silver, or an alloy thereof, a reaction occurs and oxidation occurs. There is a possibility that the performance of the superconducting layer 23 may be deteriorated. The protective layer 24 prevents the performance degradation of the oxide superconducting layer 23.

  As the stabilization layer 25, for example, a layer made of copper is used. Although the stabilization layer 25 is shown as an example in which the entire surface is covered, a structure in which the stabilization layer 25 is added only on one side is also possible.

  The resin layer 30 is formed by, for example, applying the resin to desired portions of the winding side surface portion 12A and the winding side surface portion 12B after winding the high temperature superconducting wire 20 and the insulating tape 51 together. be able to.

  The operation of the pancake coil 1 will be described.

  In the pancake coil 1, the resin layer 30 is not formed between the high temperature superconducting wire 20 and the insulating tape 51. For this reason, even when the force F which separates between the high temperature superconducting wire 20 and the insulating tape 51 is applied, there is substantially no possibility that the layers inside the high temperature superconducting wire 20 having a multilayer structure are separated.

  According to the pancake coil 1, the coil shape is maintained, and stress that causes delamination is not generated inside the high-temperature superconducting wire 20, so that the high-temperature superconducting wire 20 is not deteriorated and has good cooling characteristics. 1 is obtained.

  In the pancake coil 1 shown in FIG. 1, the resin layer 30 is formed on the entire winding side surface portion 12A and the winding side surface portion 12B, but the resin layer 30 is composed of the winding side surface portion 12A and the winding side surface portion. It is good also as a structure which coat | covers at least one part of the part 12B. With such a configuration, the amount of resin used for the resin layer 30 can be reduced, and the manufacturing cost of the pancake coil can be reduced.

[First Modification of First Embodiment]
FIG. 2 is an enlarged cross-sectional view of a first modification of the first embodiment of the pancake coil of the present invention. Since the external appearance of the pancake coil 1A shown as the first modification of the first embodiment is the same as the pancake coil 1 shown as the first embodiment, the external appearance is shown in FIG.

  Compared to the pancake coil 1 shown as the first embodiment in FIG. 1, the pancake coil 1A is different in the co-winding structure of the high-temperature superconducting wire 20 and the insulating tape 51, and the other points are the same. For this reason, the same code | symbol is attached | subjected to the same structure by 1 A of pancake coils, and the pancake coil 1, and description about an effect | action is abbreviate | omitted or simplified.

  The co-winding structure of the high-temperature superconducting wire 20 and the insulating tape 51 of the pancake coil 1A is shown in FIG. The winding portion 110A shown in FIG. 2 corresponds to the winding portion 110 shown in FIG.

  As shown in FIG. 2, in the winding portion 110A, the high-temperature superconducting wire 20 is wound so as to be shifted in the width direction of the high-temperature superconducting wire 20, that is, in the vertical direction in the drawing. In addition, in the winding portion 110A, the insulating tape 51 is also wound so as to shift in the width direction of the high-temperature superconducting wire 20 every turn.

  Thus, when the high temperature superconducting wire 20 is wound so as to be shifted in the width direction of the high temperature superconducting wire 20 every turn, the high temperature superconducting wire is compared with the pancake coil 1 shown as the first embodiment in FIG. The fixing area between 20 and the resin layer 30 increases.

  According to the pancake coil 1 </ b> A, the coil shape can be maintained and the heat transfer characteristics can be further improved as compared with the pancake coil 1.

[Second Modification of First Embodiment]
FIG. 3 is an enlarged cross-sectional view of a second modification of the first embodiment of the pancake coil of the present invention. Since the external appearance of the pancake coil 1B shown as the second modification of the first embodiment is the same as that of the pancake coil 1 shown as the first embodiment, the external appearance is shown in FIG.

  Compared to the pancake coil 1 shown as the first embodiment in FIG. 1, the pancake coil 1 </ b> B is a co-winding of the high-temperature superconducting wire 20 and the co-winding tape 50 that is insulated by using an insulating material on the surface. The other structures are the same. For this reason, the same code | symbol is attached | subjected to the same structure by the pancake coil 1B and the pancake coil 1, and description about an effect | action is abbreviate | omitted or simplified.

  The co-winding structure of the high-temperature superconducting wire 20 and the co-winding tape 50 of the pancake coil 1B is shown in FIG. The winding portion 110B shown in FIG. 3 corresponds to the winding portion 110 shown in FIG.

  As shown in FIG. 3, in the winding portion 110 </ b> B, the co-winding tape 50 is narrower than the high-temperature superconducting wire 20.

  If the co-winding tape 50 is narrower than the high-temperature superconducting wire 20 as described above, the high-temperature superconducting wire 20 and the resin layer 30 are fixed as compared with the pancake coil 1 shown as the first embodiment in FIG. Increases area.

  According to the pancake coil 1 </ b> B, the coil shape can be maintained and the heat transfer characteristics can be further improved as compared with the pancake coil 1.

  In the winding portion 110B shown in FIG. 3, the co-winding tape 50 is used. However, a metal tape intended for reinforcement may be used instead of or in addition to the co-winding tape 50. Good. When a metal tape is used, the strength of the pancake coil 1B increases. As the metal tape for the purpose of reinforcement, a metal tape made of nickel-based alloy or copper is used.

[Third Modification of First Embodiment]
FIG. 4 is an enlarged cross-sectional view of a third modification of the first embodiment of the pancake coil of the present invention. Since the external appearance of the pancake coil 1C shown as the third modification of the first embodiment is the same as the pancake coil 1 shown as the first embodiment, the external appearance is shown in FIG.

  The pancake coil 1C is different from the pancake coil 1 shown as the first embodiment in FIG. 1 in that the pancake coil 1C is further wound together by adding a metal tape 52, and the other points are the same. For this reason, the same code | symbol is attached | subjected to the same structure with 1 C of pancake coils and the pancake coil 1, and description about an effect | action is abbreviate | omitted or simplified.

  The co-winding structure of the high-temperature superconducting wire 20 of the pancake coil 1C, the insulating tape 51, and the metal tape 52 is shown in FIG. A winding portion 110C shown in FIG. 4 corresponds to the winding portion 110 shown in FIG.

  As shown in FIG. 4, in the winding portion 110C, the insulating tape 51 and the metal tape 52 are disposed between the adjacent high-temperature superconducting wires 20, 20, and the high-temperature superconducting wire 20, the insulating tape 51, and the metal tape 52 are shared. It is wound. The insulating tape 51 and the metal tape 52 are wider than the high temperature superconducting wire 20. As the metal tape 52, a material having a thermal conductivity higher than that of the nickel-based alloy, for example, a metal tape made of copper or the like is used.

  Since the pancake coil 1C is thus wound together with the high-temperature superconducting wire 20, the insulating tape 51, and the metal tape 52, compared to the pancake coil 1 shown as the first embodiment in FIG. The high-temperature superconducting wire 20 can be efficiently cooled through the inside, and the maintenance of the coil shape can be strengthened.

  According to the pancake coil 1 </ b> C, compared to the pancake coil 1, the cooling efficiency of the high-temperature superconducting wire 20 is good and the coil shape is well maintained.

  In addition, when the pancake coil 1C is attached to the high-temperature superconducting wire 20 by soldering or the like before the winding, the heat transfer between the metal tape 52 and the high-temperature superconducting wire 20 is improved, and the pancake coil 1C is cooled. The characteristics can be further improved.

[Fourth Modification of First Embodiment]
FIG. 5 is an enlarged cross-sectional view of a fourth modification of the first embodiment of the pancake coil of the present invention. Since the external appearance of the pancake coil 1D shown as the fourth modified example of the first embodiment is the same as the pancake coil 1 shown as the first embodiment, the external appearance is shown in FIG.

  The pancake coil 1D is different from the pancake coil 1B shown in FIG. 3 as the second modified example of the first embodiment in that the insulating tape 51 is replaced with the co-winding tape 53, and the other points are the same. It is. For this reason, the same code | symbol is attached | subjected to the same structure with pancake coil 1D and pancake coil 1B, and description about an effect | action is abbreviate | omitted or simplified.

  The co-winding structure of the high-temperature superconducting wire 20 of the pancake coil 1D and the co-winding tape 53 is shown in FIG. Winding portion 110D shown in FIG. 5 corresponds to winding portion 110 shown in FIG.

  As shown in FIG. 5, in the winding portion 110 </ b> D, the co-winding tape 53 is narrower than the high-temperature superconducting wire 20.

  The co-wrapped tape 53 has a heat shrinkage rate of 1% or less in the thickness direction even when cooled from 20 ° C. at room temperature to 4K at a very low temperature, and deforms the thickness by 1% or more by applying a force P in the thickness direction. However, it is made of a material having a restoring force. As the co-winding tape 53, the same tape as the metal tape 52 used for the pancake coil 1C shown as the third modified example of the first embodiment is used.

  When the pre-compression force P is applied when the co-winding tape 53 is wound, the obtained pancake coil 1D has a coil shape maintenance and heat transfer characteristics as compared with the pancake coil 1 shown as the first embodiment in FIG. Is even better.

  According to the pancake coil 1D, even when cooled from room temperature to the cryogenic temperature that is the operating temperature of the superconducting coil, there is no gap between the high-temperature superconducting wire 20 and the coiled tape 53, and the coil shape is maintained. The heat transfer characteristics can be further improved.

  In the winding portion 110D shown in FIG. 5, the co-winding tape 53 having a small thermal contraction rate is used as the co-winding tape 50. The same effect can be obtained even when a material having a small thermal shrinkage rate from 0 ° C. to 4K of extremely low temperature is used. An example of such a material is a glass fiber reinforced resin tape.

[Second Embodiment]
FIG. 6 is a view showing a second embodiment of the pancake coil of the present invention. Specifically, FIG. 6A is a cross-sectional view taken along the axial direction of a pancake-like pancake coil having a cylindrical space at the axial center, and FIG. 6B is a cross-sectional view of FIG. 6 is an enlarged cross-sectional view of a part of the pancake coil shown in FIG. 6, and FIG. 6C is an enlarged cross-sectional view of another part of the pancake coil shown in FIG.

  The pancake coil 1E shown as the second embodiment is the same in appearance as the pancake coil 1 shown as the first embodiment.

  Compared to the pancake coil 1 shown as the first embodiment in FIG. 1, the pancake coil 1 </ b> E has a structure in which the high-temperature superconducting wire 20 and the insulating tape 51 are wound together at the winding start portion 17 and the winding end portion 18. The other points are the same. For this reason, the same code | symbol is attached | subjected to the same structure by the pancake coil 1E and the pancake coil 1, and description about an effect | action is abbreviate | omitted or simplified.

  FIG. 6B is an enlarged cross-sectional view of the winding portion 110E of the winding start portion 17 of the pancake coil 1E. FIG.6 (c) is an expanded sectional view of the coil part 110E of the winding middle part 19 of the pancake coil 1E. Although not shown, the winding portion of the winding end portion 18 of the pancake coil 1E has the same structure as the winding portion of the winding start portion 17.

  As shown in FIG. 6C, the co-winding structure of the high temperature superconducting wire 20 and the insulating tape 51 in the winding portion 190E of the winding middle portion 19 of the pancake coil 1E is the pancake shown in FIG. The structure is the same as that of the winding portion 110 of the coil 1.

  However, as shown in FIG. 6B, in the winding portion 170E of the winding start portion 17 of the pancake coil 1E, the co-winding structure of the high temperature superconducting wire 20 and the insulating tape 51 is the structure of 190E. Different.

  That is, in the winding portion 170E of the winding start portion 17, in addition to the resin layer 30 on the surfaces of the winding side surface portion 12A and the winding side surface portion 12B, between the co-wound high temperature superconducting wire 20 and the insulating tape 51. In addition, an inter-tape resin layer 31 made of a cured resin is formed. Further, the winding portion of the winding end portion 18 has the same structure as the winding portion 170E of the winding start portion 17. As resin used for formation of resin layer 31 between tapes, the same thing as resin used for formation of resin layer 30 is mentioned, for example.

  Examples of a method for forming the inter-tape resin layer 31 include a method of applying a resin when the high-temperature superconducting wire 20 and the insulating tape 51 are wound together and wound.

  When the inter-tape resin layer 31 is formed in this manner, the high temperature superconducting wire 20 and the insulating tape 51 are less likely to be unwound at the winding end portion 18 and the winding start portion 17. In addition, since the winding end part 18 and the winding start part 17 are a boundary with the circumference | surroundings, restraining force becomes weak. For this reason, even if the inter-tape resin layer 31 is formed between the high-temperature superconducting wire 20 and the insulating tape 51, the thermal stress for separating the high-temperature superconducting wire 20 and the insulating tape 51 can be small.

  According to the pancake coil 1E, the coil shape maintenance characteristic can be further improved as compared with the pancake coil 1 shown as the first embodiment in FIG.

  6 shows an example in which the inter-tape resin layer 31 is formed on the winding end portion 18 and the winding start portion 17, but the inter-tape resin layer 31 is formed only on either the winding end portion 18 or the winding start portion 17. It can also be set as the structure in which is formed. If the inter-tape resin layer 31 is formed only in either the winding end portion 18 or the winding start portion 17, the manufacturing cost can be reduced.

[Third Embodiment]
FIG. 7 is a view showing a third embodiment of the pancake coil of the present invention. Specifically, FIG. 7A is a perspective view in which a part of a pancake-like pancake coil having a cylindrical space at the center in the axial direction is cut along the axial direction, and FIG. It is a partial expanded sectional view of the pancake coil shown to a).

  Compared to the pancake coil 1 shown as the first embodiment in FIG. 1, the pancake coil 1 </ b> F shown as the third embodiment has the winding start frame 61 and the winding end portion 18 on the inner periphery of the winding start portion 17. The difference is that a winding end frame 62 is provided on the outer periphery, and a pair of insulating plates 45, 45 covering the axial direction of the winding portion 11F is provided, and the other points are the same. For this reason, the same code | symbol is attached | subjected to the same structure with the pancake coil 1F and the pancake coil 1, and description about an effect | action is abbreviate | omitted or simplified.

  FIG.7 (b) is an expanded sectional view of the coil part 170F of the winding start part 17 of the pancake coil 1F.

  As shown in FIG. 7A, the winding start frame 61 includes an insulator part 63 formed in a substantially ring shape and an electrode part 64 provided in a part of the insulator part 63.

  As shown in FIG. 7B, the winding start frame 61 is provided adjacent to the innermost turn of the high temperature superconducting wire 20 of the winding start portion 17.

  The insulator portion 63 of the winding start frame 61 protects the winding start portion 17 of the high temperature superconducting wire 20 and electrically insulates the high temperature superconducting wire 20. As a material of the insulator 63, for example, FRP or the like is used.

  The electrode part 64 of the winding start frame 61 is a member that conducts with the high temperature superconducting wire 20 of the winding start part 17. As a material of the electrode part 64, for example, copper is used.

  In addition, a pair of insulating plates 45, 45 are provided on a pair of surfaces in the axial direction of the winding portion 11F.

  Further, although not shown, the pancake coil 1 </ b> F is provided on the winding end frame 62 on the insulator part formed in a substantially ring shape having the same shape and function as the winding start frame 61 and a part of this insulator part. An electrode portion.

  When the winding start frame 61 and the winding end frame 62 are provided in this manner, the winding start portion 17 and the winding start portion 17 and the winding can be performed without forming the inter-tape resin layer 31 as in the pancake coil 1E shown as the second embodiment in FIG. The winding shape of the high-temperature superconducting wire 20 at the end portion 18 can be strongly retained.

  According to the pancake coil 1F, the coil shape can be maintained better than the pancake coil 1 shown as the first embodiment in FIG.

  7 shows an example in which the winding start frame 61 and the winding end frame 62 are provided. However, only one of the winding start frame 61 and the winding end frame 62 may be provided. If only one of the winding start frame 61 and the winding end frame 62 is provided, the manufacturing cost can be reduced.

<High temperature superconducting coil>
FIG. 8 is a cross-sectional view of the high temperature superconducting coil of the present invention.

  The high temperature superconducting coil 2 is obtained by stacking the pancake coils 1 shown as the first embodiment in FIG. 1 and electrically connecting the pancake coils 1 and 1.

  As shown in FIG. 8, the pancake coils 1, 1 adjacent to each other in the stacking direction are connected to the high temperature superconducting wire 20 drawn from the winding start portion 17 or the high temperature superconducting wire 20 drawn from the winding end portion 18. Connected with. Thereby, the several pancake coil 1 is electrically connected in series. The heat transfer plate 40 attached to each pancake coil 1 extends outside the pancake coil 1. Since the heat transfer plate 40 extends outside the pancake coil 1, the high-temperature superconducting coil 2 can be efficiently cooled.

  According to the high-temperature superconducting coil 2, the coil shape is maintained, no stress that causes delamination is generated inside the high-temperature superconducting wire 20, and the cooling characteristics are good.

  In addition, although the example which laminated | stacked the pancake coil 1 was shown in FIG. 8, it replaces with the pancake coil 1 and the high temperature superconducting coil of this invention is good also as a structure using the pancake coils 1A-1F. The obtained high-temperature superconducting coil has the features of a laminated pancake coil.

  In the first to third embodiments, a normal pancake coil is shown as an example, but the present invention can be similarly applied to a racetrack-shaped pancake coil.

1, 1A, 1B, 1C, 1D, 1E, 1F Pancake coil 2 High-temperature superconducting coil 11, 11F Winding portion 110, 110A, 110B, 110C, 110D, 170F Winding portion 12A, 12B Inside winding side portion 15 Peripheral surface 16 Outer peripheral surface 17 Winding start portion 170E Winding start portion 18 Winding end portion 19 Winding middle portion 190E Winding middle portion 20 High-temperature superconducting wire 21 Metal substrate 22 Intermediate layer 23 Superconducting layer 24 Protective layer 25 Stabilizing layer 30 Resin layer 31 Inter-tape resin layer 35 Space 40 Heat transfer plate 45 Insulating plate 50 Co-winding tape 51 Insulating tape 52 Metal tape 53 Co-winding tape P Precompression force 61 Winding start frame 62 Winding end frame 63 Insulator part 64 Electrode part 70 Connection

Claims (14)

Using a tape-shaped high-temperature superconducting wire formed by sequentially forming an intermediate layer and an oxide superconducting layer on the surface of a metal substrate, this high-temperature superconducting wire is wound to have a pancake shape having a space penetrating the axial center In the pancake coil formed in
Between turns of the wound the high-temperature superconducting wire is not fixed in the resin layer, and at least a portion of the winding side portion constituting the end faces of the pair of axial direction is covered with tree fat layer, further wherein A high-temperature superconducting pancake coil , wherein a heat transfer member is fixed to the surface of a resin layer . The high-temperature superconducting pancake coil according to claim 1 , wherein the heat transfer member has a thin plate shape and is thermally connected to the cooling means directly or via another heat transfer member . 2. The high-temperature superconducting pancake coil according to claim 1, wherein the high-temperature superconducting wire is wound so as to shift in the width direction of the high-temperature superconducting wire every turn. 2. The high-temperature superconducting pancake coil according to claim 1, wherein the high-temperature superconducting wire is wound together with a co-winding tape. 5. The high-temperature superconducting pancake coil according to claim 4, wherein the co-winding tape is made of a material having a restoring force even when deformed by 1% or more in the thickness direction. 5. The high-temperature superconducting pancake coil according to claim 4, wherein the co-winding tape is made of a material having a thermal contraction rate smaller than that of the resin layer. The high temperature superconducting pancake coil according to any one of claims 4 to 6, wherein the co-winding tape has a narrower width than the high temperature superconducting wire. The high temperature superconducting pancake coil according to any one of claims 4 to 6, wherein the co-winding tape is a metal tape having a width wider than that of the high temperature superconducting wire. The high temperature superconducting pancake coil according to any one of claims 4 to 6, wherein the co-winding tape includes an insulating tape and a metal tape having a width wider than that of the high temperature superconducting wire. The high temperature superconducting pancake coil according to claim 8 or 9, wherein the high temperature superconducting wire and the metal tape are wound after being electrically connected. The turn of the high-temperature superconducting wire at least one of the winding start portion near the inner peripheral surface facing the cylindrical space and the winding end portion near the outer peripheral surface is impregnated with resin between the turns of the adjacent high-temperature superconducting wire. The high-temperature superconducting pancake coil according to claim 1, wherein A frame for fixing the winding start portion or the winding end portion is attached to at least one of the winding start portion near the inner peripheral surface and the winding end portion near the outer peripheral surface facing the cylindrical space. The high-temperature superconducting pancake coil according to claim 1. The said frame body has a substantially ring-shaped insulator part, and the electrode formed in a part of this insulator part, and electrically connected with the said high temperature superconducting wire, It is characterized by the above-mentioned. High temperature superconducting pancake coil. The high-temperature superconducting pancake coil according to any one of claims 1 to 13 is laminated, the pancake coils are electrically connected, and the heat transfer member is cooled directly or via another heat transfer member. A high-temperature superconducting coil characterized by being thermally connected to the means .

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