JP2017063083A - High temperature superconducting coil not having insulation for each turn and manufacturing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high temperature superconducting coil not having insulation for each turn by a coil manufacturing method using thermoplastic resin, in which a cooling side plate and a coil winding can be fixed strongly without changing the characteristics as a non-insulated coil, and to provide a manufacturing method therefor.SOLUTION: In a manufacturing method for a high temperature superconducting coil 3 where rare-earth high temperature superconducting wires 2 of a high temperature superconducting coil are not bonded, and an insulation for each turn fixing the end face of the wound rare-earth high temperature superconducting wire 2 to a cooling side plate 5 is not provided, the high temperature superconducting coil 3 consisting of the rare-earth high temperature superconducting wire 2 and not having an insulation for each turn is wound around a reel 1 made of glass fiber-reinforced plastic, a thermoplastic resin film 4 is applied to the cooling side plate 5, the cooling side plate 5 and the high temperature superconducting coil 3 are assembled, and then the assembled high temperature superconducting coil 3 is heated and cooled, thus affixing the high temperature superconducting coil 3 and the cooling side plate 5 by means of the thermoplastic resin film 4.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a high-temperature superconducting coil having no insulation for each turn and a method for producing the high-temperature superconducting coil.

  For high-temperature superconducting coils, research on non-insulation coils is being promoted from the viewpoint of coil protection during thermal runaway.

  In addition, although the rare earth-based high-temperature superconducting wire has a high tensile strength, it has a characteristic that the strength is low in the superconducting layer lamination direction (peeling direction). For this reason, when impregnation is performed with a resin typified by epoxy, peeling of the wire material occurs due to thermal stress at the time of cooling, causing a problem in that the performance of the superconducting coil is reduced.

Japanese Patent Laying-Open No. 2015-103587

Seungyong Hahn et al, “HTS Pancake Coils Without-Turn-Turn Insulation”, IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, VOL. 21, NO. 3, JUNE 2011

  Therefore, the inventors of the present application have proposed using polytetrafluoroethylene (PTFE), which is non-adhesive with epoxy, for interlayer insulation as a technique for preventing the above-described performance degradation (see Patent Document 1). .

  4 is a sectional view of a conventional high-temperature superconducting coil, and FIG. 5 is a drawing-substituting photograph showing the conventional high-temperature superconducting coil.

  In FIG. 4, 101 is a winding frame, 102 is a rare earth-based high-temperature superconducting wire, 103 is a PTFE film, 104 is a PTFE film-coiled superconducting coil, 105 is a cooling side plate, and 106 is an epoxy resin. As described above, the PTFE film co-wound superconducting coil 104 is formed using the tape-like PTFE film 103 as an insulating material between the rare earth-based high-temperature superconducting wires 102, and the PTFE film co-wound superconducting coil 104 is impregnated with the epoxy resin 106. Then, the cooling side plate 105 and the PTFE film co-winding superconducting coil 104 are fixed. In this way, the rare-earth high-temperature superconducting wires of the superconducting coil are separated from each other, and the end surface of the superconducting coil is fixed to the side plate for cooling.

  However, this method cannot be used in non-insulated coils because there is no insulation between turns. In addition to this, if the resin impregnation is performed with other than the epoxy resin, the contact resistance between the wires changes due to the resin permeated between the coil turns, and the characteristics of the non-insulated coil may change.

  On the other hand, if no treatment such as impregnation is performed, it is difficult to keep the coil shape and prevent deformation, and thermal bonding between the coil and the cooling plate cannot be performed.

  In view of the above situation, the present invention provides a coil manufacturing method using a thermoplastic resin that does not have insulation for each turn and can firmly fix a cooling plate and a coil winding without changing the characteristics as a non-insulated coil. It is an object of the present invention to provide a high-temperature superconducting coil that does not have an insulation for each turn due to, and a method for manufacturing the high-temperature superconducting coil.

In order to achieve the above object, the present invention provides
[1] Method for producing a high-temperature superconducting coil having no insulation for each turn, in which the rare-earth high-temperature superconducting wire of the high-temperature superconducting coil is not bonded and the end face of the wound rare-earth high-temperature superconducting wire is fixed to the cooling side plate The high-temperature superconducting coil (3) having no insulation for each turn made of a rare earth-based high-temperature superconducting wire (2) is wound around the glass fiber reinforced plastic winding frame (1), and the thermoplastic resin film (4) is cooled on the cooling side plate. (5, 11), assemble the cooling side plate (5, 11) and the high temperature superconducting coil (3), heat the assembled high temperature superconducting coil (3) above the melting point of the thermoplastic resin, and cool to room temperature. Thus, the high-temperature superconducting coil (3) and the cooling side plate (5, 11) are fixed by the thermoplastic resin film (4).

  [2] In the method for producing a high-temperature superconducting coil having no turn-by-turn insulation as described in [1] above, the thermoplastic resin film is mainly composed of a copolymer of ethylene and methacrylic acid.

  [3] In the method for producing a high-temperature superconducting coil having no insulation for each turn as described in [1], the cooling side plate is made of glass fiber reinforced plastic. Manufacturing method.

  [4] In the method for manufacturing a high-temperature superconducting coil having no turn-by-turn insulation as described in [1] above, the cooling side plate is made of a highly heat-conductive metal material. Manufacturing method.

  [5] In the high-temperature superconducting coil that does not bond between the rare-earth high-temperature superconducting wires of the high-temperature superconducting coil and does not have insulation for each turn that fixes the end face of the wound rare-earth high-temperature superconducting wire to the cooling side plate. The cooling side plates (5, 11) and the rare earth-based high-temperature superconducting wire (2) are fixed by heating / cooling the thermoplastic resin film (4) to form an integral structure.

  [6] The high-temperature superconducting coil having no turn-by-turn insulation as described in [5] above, wherein the thermoplastic resin film is mainly composed of a copolymer of ethylene and methacrylic acid.

  [7] The high-temperature superconducting coil having no turn-by-turn insulation as described in [5], wherein the cooling side plate is a glass fiber reinforced plastic.

  [8] The high-temperature superconducting coil having no turn-by-turn insulation as described in [5] above, wherein the cooling side plate is a high heat conductive metal material.

  According to the present invention, the cooling side plate and the coil winding can be firmly fixed without changing the characteristics of the non-insulated coil.

It is sectional drawing of the high temperature superconducting coil which does not have the insulation for every turn which shows the Example of this invention. It is sectional drawing of the high temperature superconducting coil which does not have the insulation for every turn which shows the other Example of this invention. It is sectional drawing of the high temperature superconducting coil which does not have the insulation for every turn which shows the further another Example of this invention. It is sectional drawing of the conventional high temperature superconducting coil. It is a drawing substitute photograph which shows the conventional high temperature superconducting coil.

  The method for producing a high-temperature superconducting coil having no insulation for each turn according to the present invention is such that the rare-earth high-temperature superconducting wire of the high-temperature superconducting coil is not bonded, and the end face of the wound rare-earth high-temperature superconducting wire is a cooling side plate. In a method for producing a high-temperature superconducting coil that does not have insulation for each turn to be fixed, a high-temperature superconducting coil that does not have insulation for each turn made of a rare earth-based high-temperature superconducting wire is wound around a glass fiber reinforced plastic winding frame, and a thermoplastic resin film Is constructed on the cooling side plate, the cooling side plate and the high-temperature superconducting coil are assembled, the assembled high-temperature superconducting coil is heated to the melting point of the thermoplastic resin or more, and cooled to room temperature, thereby bringing the high-temperature superconducting coil and the cooling side plate into the thermoplastic resin. Stick with film.

  Hereinafter, embodiments of the present invention will be described in detail.

  FIG. 1 is a cross-sectional view of a high temperature superconducting coil having no turn-by-turn insulation according to an embodiment of the present invention.

  In this figure, 1 is a glass fiber reinforced plastic winding frame, 3 is a high-temperature superconducting coil made of rare earth-based high-temperature superconducting wire 2 and does not have insulation per turn, and 4 is a thermoplastic resin film (for example, a copolymer of ethylene and methacrylic acid). Polymer) 5 is a cooling side plate made of glass fiber reinforced plastic.

  FIG. 2 is a cross-sectional view of a high temperature superconducting coil having no turn-by-turn insulation according to another embodiment of the present invention.

  In this figure, 1 is a glass fiber reinforced plastic winding frame, 3 is a high-temperature superconducting coil made of rare earth-based high-temperature superconducting wire 2 and does not have insulation per turn, and 4 is a thermoplastic resin film (for example, a copolymer of ethylene and methacrylic acid). (Polymer) 11 is a cooling side plate made of a highly heat conductive metal material.

  A method for manufacturing a high-temperature superconducting coil having no insulation for each turn according to the present invention is as follows, for example.

  (1) A high-temperature superconducting coil 3 made of a rare earth-based high-temperature superconducting wire 2 and having no insulation for each turn is wound around a glass fiber reinforced plastic winding frame 1.

  (2) A thermoplastic resin film 4 (a thermoplastic film laminated on both sides of a polyimide film) is applied to the cooling side plates 5 and 11.

  (3) Assemble the cooling side plates 5 and 11 and the high temperature superconducting coil 3.

  (4) The assembled high temperature superconducting coil 3 is heated to a temperature higher than the melting point of the thermoplastic resin (100 ° C. or higher, about 30 minutes) and cooled to room temperature, whereby the high temperature superconducting coil 3 and the cooling side plates 5 and 11 are thermoplastic. It is fixed by the resin film 4.

  As described above, according to the present invention, the high-temperature superconducting coil 3 made of rare earth-based high-temperature superconducting wire and not having insulation per turn is fixed between the cooling side plates by the thermoplastic resin film 4 according to the present invention. To do. The cooling side plates 5 and 11 are made of glass fiber reinforced plastic or a highly heat conductive metal material.

  FIG. 3 is a cross-sectional view of a high temperature superconducting coil having no turn-by-turn insulation according to still another embodiment of the present invention.

  In this figure, 1 is a glass fiber reinforced plastic winding frame, 21 is a high-temperature superconducting coil in which a rare earth-based high-temperature superconducting wire 22 and a high-purity aluminum tape 23 are wound together, and 4 is a thermoplastic resin film (for example, ethylene and methacrylic acid). , 24 is a cooling side plate made of glass fiber reinforced plastic or an insulating high heat conductive metal material.

  According to the high temperature superconducting coil having no turn-by-turn insulation and the method for producing the high temperature superconducting coil of the present invention, the high temperature superconducting coil has three important parameter performances: total current density, thermal stability, mechanical Conservation can be enhanced.

  Therefore, according to the present invention, since the high temperature superconducting coil without insulation for each turn using the thermoplastic resin is manufactured, the resin does not penetrate between the coil turns. Therefore, the cooling side plate and the coil winding can be firmly fixed without changing the characteristics as a non-insulated coil. Moreover, the shape as a coil is also ensured by the cooling side plate.

  In addition, this invention is not limited to the said Example, Based on the meaning of this invention, a various deformation | transformation is possible and these are not excluded from the scope of the present invention.

  The high-temperature superconducting coil having no turn-by-turn insulation and the method for producing the high-temperature superconducting coil of the present invention are capable of firmly fixing the cooling side plate and the coil winding without changing the characteristics as a non-insulating coil. The present invention can be used as a high-temperature superconducting coil having no insulation for each turn by a coil manufacturing method using resin and a method for producing the high-temperature superconducting coil.

DESCRIPTION OF SYMBOLS 1 Glass fiber reinforced plastic winding frame 2 Rare earth system high temperature superconducting wire 3 High temperature superconducting coil which does not have insulation for every turn which consists of rare earth system high temperature superconducting wire 4 Thermoplastic resin film 5 Cooling side board which consists of glass fiber reinforced plastic 11 Insulation process Cooling side plate made of high heat conductive metal material 21 High temperature superconducting coil 22 Rare earth high temperature superconducting wire 23 High purity aluminum tape 24 Cooling side plate made of glass fiber reinforced plastic or high heat conductive metal material

Claims (8)

In the method for producing a high-temperature superconducting coil without bonding between the rare earth-based high-temperature superconducting wires of the high-temperature superconducting coil and having no insulation for each turn for fixing the end face of the wound rare-earth high-temperature superconducting wire to the cooling side plate,
(A) winding a high-temperature superconducting coil having no insulation for each turn made of a rare earth-based high-temperature superconducting wire around a glass fiber reinforced plastic winding frame;
(B) applying a thermoplastic resin film to the cooling side plate;
(C) Assembling the cooling side plate and the high-temperature superconducting coil,
(D) The assembled high-temperature superconducting coil is heated to a temperature higher than the melting point of the thermoplastic resin, and cooled to room temperature, thereby fixing the high-temperature superconducting coil and the cooling side plate with a thermoplastic resin film. For producing a high-temperature superconducting coil having no magnetic field.   The method for producing a high temperature superconducting coil having no insulation for each turn according to claim 1, wherein the thermoplastic resin film is mainly composed of a copolymer of ethylene and methacrylic acid. A method for producing a high-temperature superconducting coil that does not have.   2. The method for producing a high-temperature superconducting coil having no insulation for each turn according to claim 1, wherein the cooling side plate is made of glass fiber reinforced plastic.   2. The method of manufacturing a high-temperature superconducting coil having no insulation for each turn according to claim 1, wherein the cooling side plate is made of a highly heat conductive metal material.   In the high-temperature superconducting coil that does not adhere between the rare earth-based high-temperature superconducting wires of the high-temperature superconducting coil and does not have insulation for each turn for fixing the end face of the wound rare-earth high-temperature superconducting wire to the cooling side plate, A high-temperature superconducting coil having no insulation for each turn, wherein the rare-earth high-temperature superconducting wire is fixed by heating / cooling a thermoplastic resin film and integrally formed.   6. The high-temperature superconducting coil having no turn-by-turn insulation according to claim 5, wherein the thermoplastic resin film is mainly composed of a copolymer of ethylene and methacrylic acid, and does not have turn-by-turn insulation. Superconducting coil.   6. The high-temperature superconducting coil having no insulation for each turn according to claim 5, wherein the cooling side plate is made of glass fiber reinforced plastic.   6. The high temperature superconducting coil having no turn-by-turn insulation according to claim 5, wherein the cooling side plate is made of a highly heat conductive metal material.

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