WO2017018144A1 - Bobine supraconductrice et son procédé de production - Google Patents

Bobine supraconductrice et son procédé de production Download PDF

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Publication number
WO2017018144A1
WO2017018144A1 PCT/JP2016/070031 JP2016070031W WO2017018144A1 WO 2017018144 A1 WO2017018144 A1 WO 2017018144A1 JP 2016070031 W JP2016070031 W JP 2016070031W WO 2017018144 A1 WO2017018144 A1 WO 2017018144A1
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WO
WIPO (PCT)
Prior art keywords
superconducting
winding
wire
superconducting coil
resin
Prior art date
Application number
PCT/JP2016/070031
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English (en)
Japanese (ja)
Inventor
敬子 中野
阿部　洋一
照久 宮副
学 青木
Original Assignee
株式会社日立製作所
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Publication date
Application filed by 株式会社日立製作所 filed Critical 株式会社日立製作所
Priority to JP2017531108A priority Critical patent/JP6445165B2/ja
Publication of WO2017018144A1 publication Critical patent/WO2017018144A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F6/00—Superconducting magnets; Superconducting coils
    • H01F6/06—Coils, e.g. winding, insulating, terminating or casing arrangements therefor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment

Definitions

  • the present invention relates to a superconducting coil used in an MRI apparatus, a magnetic levitation railway, a high magnetic field generator, and the like.
  • quenching In a coil in a superconducting state, a voltage is generated due to heat generation in a minute part and becomes a normal conducting state, and the entire coil is overheated is called quenching.
  • Patent Document 1 discloses a superconducting coil that suppresses the occurrence of quenching.
  • This patent document 1 states that an insulation superconducting wire is coated with a fusion material to form a fusion superconducting wire, the fusion superconducting wire is wound around a winding frame in a plurality of rows and layers, and heat treatment is applied to the fusion material.
  • the superconducting coil formed by melting and then bonding the fusion material and adhering between the adjacent fusion superconducting wires the fusion material and the filamentous insulation are formed in the gaps between the adjacent fusion superconducting wires.
  • a fusion insulator consisting of a material is disposed ”(see summary).
  • Patent Document 2 states that “when a superconducting wire is coated with an insulating material to form an insulating superconducting wire and a winding portion is formed while applying tension to the superconducting wire, the winding tension of the insulating superconducting wire is set at the outer layer compared to the inner layer. Increase the residual compressive stress between the curved surfaces of the superconducting wires to increase the residual compressive stress, making it difficult for delamination, and the thermal stress acting on the fusion material between the curved surfaces of adjacent superconducting wires. It is reduced to prevent the generation of cracks and frictional heat, and suppress the occurrence of quenching "(see summary).
  • Superconducting coils used in MRI equipment, magnetic levitation railways, high magnetic field generators, etc. are made by winding superconducting wires in multiple rows and multiple layers, and are made by integrating resin between the conducting wires and the conducting wire and the insulating plate.
  • a superconducting coil When a superconducting coil is used, a high electromagnetic field is obtained by applying a high current to a conducting wire that has been cooled to a superconducting state. A shear stress is generated between the members due to a difference in coefficient of thermal expansion between the members during cooling and deformation of the coil due to electromagnetic force. This stress causes a crack in the resin constituting the superconducting coil, separation between members, and movement of the coil, and there is a problem that Joule heat and frictional heat accompanying these induce quenching.
  • Patent Document 1 discloses a method for suppressing quenching by increasing the area of adhesion by filling a gap between conductive wires in order to suppress quench induction by strengthening the adhesive force between members.
  • the adhesive strength is strengthened, but on the other hand, the difference in the thermal expansion coefficient between the conductor and the resin increases the strain during cooling, causing quenching by inducing peeling and cracking of this part. May occur.
  • Patent Document 2 a non-acute cavity is provided between the curved surface portions of the superconducting wires to increase the residual compressive stress, thereby preventing the separation, and acting on the fusion material between the curved surface portions of adjacent superconducting wires. It is disclosed that thermal stress is reduced to prevent generation of cracks and frictional heat and to suppress generation of quench. However, due to the presence of the cavity, the area of the interface between the conductive wire and the resin is reduced, the adhesive force is lowered, and quenching may occur.
  • This invention aims at providing the superconducting coil which suppressed generation
  • An example of the superconducting coil of the present invention is a superconducting coil having a winding portion in which a superconducting wire is wound in a plurality of rows and a plurality of layers on a winding frame, and a reinforcing material is provided between the layers of the superconducting wire of the winding portion.
  • the superconducting wire and the reinforcing material are integrated with resin, and a cavity is provided at a corner of the adjacent superconducting wire.
  • the present invention since the amount of deformation at the time of cooling due to the difference in coefficient of thermal expansion between members can be suppressed by suppressing the amount of resin to be used, it is possible to prevent peeling and cracking of the resin.
  • liquid helium which is a refrigerant, enters the cavity, the cooling effect is enhanced and the temperature margin can be widened. Thereby, generation
  • FIG. It is a figure which shows the structure of a superconducting coil. It is a figure which shows the structure of the coil
  • 2 is a diagram showing a cross section of a superconducting wire of Example 1.
  • FIG. It is a figure which shows the structure of the boundary part of the coil
  • the configuration of the superconducting coil 11 will be described with reference to FIG.
  • the superconducting coil winding portion 15 wound around the winding frame 12 is bonded to the upper and lower insulating layers 13 arranged between the winding portion and the flange portion on the surface in the axial direction. Further, the radially inner peripheral surface of the superconducting coil winding portion 15 is bonded to the inner peripheral insulating layer 14.
  • the winding frame 12, the upper and lower insulating layers 13, and the inner peripheral insulating layer 14 are not fastened. Therefore, when the superconducting coil winding portion 15 is displaced, the upper and lower insulating layers 13 and the inner peripheral insulating layer 14 move integrally with the superconducting coil winding portion 15 and move independently of the winding frame 12.
  • the superconducting coil 11 is installed in a heat insulating container and operates as an electromagnet by supplying a current from a power source while being immersed in a refrigerant such as liquid helium.
  • the axial direction of the superconducting coil winding portion 15 refers to a direction parallel to the central axis when the superconducting wire is wound in an annular shape, and the radial direction is a direction perpendicular to the central axis.
  • the arrangement of radial lines is called a layer, and the arrangement of axial lines is called a column.
  • An inner peripheral insulating layer 14 is disposed on the outer peripheral side of the winding frame 12, and the superconducting wire 5 is wound around the outer peripheral side in a solenoid shape.
  • the layers of the superconducting wire 5 are bonded via the reinforcing material 2 and the resin 3, and the winding portion 15 is integrated.
  • the superconducting wire 5 includes a superconducting wire 16 such as a niobium-based superconducting wire, a magnesium diboride superconducting wire, a bismuth-based copper oxide superconducting wire, a rare earth-based superconducting wire, and a polyimide covering the outer peripheral surface thereof. It is made of an insulating material 17 such as resin or enamel. Although these cross-sectional shapes are not limited, in this embodiment, a square line having an R at the corner is used.
  • the reinforcing material 2 is made of a glass fiber, carbon fiber, heat resistant resin, ceramic filler, or the like formed into a mesh or woven fabric, or a nonwoven fabric or film. If the resin 3 can be held and can be used at an extremely low temperature, the material and shape of the reinforcing material 2 are not limited. However, the sheet form is preferable in terms of the winding method.
  • the resin 3 can be either a thermosetting resin or a thermoplastic resin. As the thermosetting resin, epoxy, acrylic or the like is used, and as the thermoplastic resin, phenoxy, nylon or the like is used. When using a thermosetting resin, you may add a hardening initiator and a hardening accelerator. In this example, a prepreg was inserted between the layers. The prepreg is obtained by holding the resin 3 in advance on the reinforcing material 2.
  • the materials and thicknesses of the upper and lower insulating layers 13 and the inner peripheral insulating layer 14 are selected from heat insulation and insulating performance, and for example, glass fiber reinforced plastic or molded resin containing ceramic filler is used.
  • the inner peripheral insulating layer 14 is wound around a winding frame.
  • a winding frame There are various insertion methods for the upper and lower insulating layers, but any method may be used so that the structure shown in FIG. 1 is finally obtained.
  • the superconducting wire 5 is wound around the outer peripheral side of the inner peripheral insulating layer 14.
  • surface tension is applied in the axial direction by applying tension to the conducting wire, thereby bringing the conducting wires between the layers into close contact with each other.
  • the prepreg is wound around the outer periphery of the conducting wire before winding the next layer, and the conducting wires and the prepreg are wound in a coil shape alternately arranged in the radial direction.
  • FIG. 2 shows an enlarged view of the winding portion of the coil when a glass fiber fabric is used as the reinforcing material 2 between the layers in this embodiment.
  • FIG. 2 there is a resin-free cavity 1 at the corner of the adjacent conductor 5 of the coil winding portion 15 manufactured in this way.
  • the area of the interface between the conductor and the resin is reduced, and the adhesive force is reduced.
  • the adhesive strength is enhanced by the reinforcing material in the present invention, and a sufficiently strong adhesive strength can be obtained against shearing stress due to cooling or electromagnetic force.
  • One is the adhesion between layers. Between the layers, the area of the interface between the reinforcing material and the resin is large, and the adhesive force is reinforced by the anchor effect. The other is to strengthen the adhesion between the rows.
  • the conductive wires between the rows are not actively adhered, and there are portions that are not bonded. However, the positions of the conductive wires adjacent to each other in the row are fixed by the reinforcing members on both sides, and are integrated sufficiently firmly.
  • the present embodiment since there is a resin-free cavity at the corner of the adjacent conductor of the coil winding, deformation during cooling is smaller than when the resin is filled, and distortion and shearing are reduced. Stress is reduced and peeling and cracking are less likely to occur.
  • a refrigerant such as liquid helium enters the cavity, the cooling effect is enhanced, and the temperature margin is increased. Therefore, the occurrence of quenching can be suppressed.
  • the reinforcing material is disposed between the conductors having the cavities, the adhesive force between the wires can be enhanced, and a sufficient adhesive force can be obtained even if the cavities exist.
  • FIG. 4 shows the configuration of the inner peripheral insulating layer and the coil of the winding portion in Example 2.
  • Resin is disposed on the outer peripheral side of the inner peripheral insulating layer 14.
  • the amount of resin is increased as compared to between the conductors, and a structure is provided in which no cavity is provided between the inner peripheral insulating layer and the innermost (first layer) conductor 5.
  • As the method it is conceivable to use, as the inner peripheral insulating layer 14, a resin layer that has been cured / semi-cured in advance on the outer peripheral side of the insulating layer, or to apply a resin solution to the inner peripheral insulating layer 14.
  • the resin used for these may be a thermosetting resin or a thermoplastic resin. Moreover, you may use the reinforcing material 2 together.
  • prepregs which are reinforcing materials containing a resin
  • the resin layer formed on the insulating layer or the resin used for the solution to be applied and the resin contained in the prepreg may be the same or different.
  • FIG. 5 shows the configuration of the upper and lower insulating layers and the coil of the winding portion.
  • the reinforcing material 2 may be used in combination.
  • a gap of the same degree as one side of the conductive wire is generated when the conductive wire moves between the layers. At this time, if the gap is filled only with resin, the strain at the time of cooling becomes large.
  • a spacer 4 having a thermal expansion coefficient equivalent to that of the insulating layer or the conductive wire it is preferable to insert a spacer 4 having a thermal expansion coefficient equivalent to that of the insulating layer or the conductive wire. Even when a spacer is used, since the bonding area is insufficient, the amount of resin is calculated by adding the amount that fills the gap between the upper and lower insulating layers and the conductor.
  • the space between the line directly in contact with the inner peripheral insulating layer 14 and the upper and lower insulating layers 13 and the line is filled with resin, so that the outer peripheral side from one layer from the inner peripheral insulating layer 14 and the first line from the upper and lower insulating layers 13 Inside, there is a cavity.
  • Example 3 uses a superconducting wire with a fused wire in which a coating film of a thermoplastic resin or a thermosetting resin is previously formed.
  • the final coil shape is the same as that shown in FIGS.
  • the difference from Example 1 is the difference in the manufacturing method when manufacturing the coil.
  • the conducting wire is composed of a superconducting wire 16, an insulating material 17 covering the outer peripheral surface thereof, and a thermoplastic resin or thermosetting resin 3 covering the outer peripheral surface.
  • Thermoplastic resins such as phenoxy and nylon are used, and thermosetting resins such as epoxy and acrylic are used.
  • Thermosetting resins are viscous before curing, and it is difficult to apply tension during winding. Therefore, considering the ease of production, thermoplastic resins are preferred.
  • the resin is covered with the conductive wire among the members constituting the interlayer, only the reinforcing material containing no resin is used in addition to the prepreg described in Example 1 as the reinforcing material. be able to.
  • the coating resin of the fusion wire melts and flows, and the adhesive force can be secured by filling the glass cloth.
  • the resin contained in the prepreg and the resin of the fusion wire may be the same or different.
  • the method for securing the adhesive force between the inner peripheral insulating layer 14 and the upper and lower insulating plates 13 and the winding portion 15 is the same as the method described in the second embodiment, and is omitted here, but here also the reinforcing material is used. As in the above-mentioned interlayer, it is also possible to use only a reinforcing material that does not contain a resin.
  • thermosetting resin contains a solvent or decreases in volume when cured, the pressure between the wires decreases during heating, and the adhesive force between the inner peripheral insulating layer 13 and the winding portion 15 is reduced. May not be sufficiently obtained. For this reason, a combination of only the fusion line coated with the thermoplastic resin and the reinforcing material 2 is preferable.
  • the superconducting coil can be easily manufactured.
  • Example 4 uses a round wire for the superconducting wire.
  • the reinforcing material is formed with irregularities with a pitch that matches the diameter of the round wire in advance so that the lead wire and the reinforcing material can adhere to each other to ensure a bonding area. It is good to keep.
  • FIG. 7 shows one of the present examples.
  • the structure which provided the convex part with the pitch corresponding to the diameter of conducting wire in the inner peripheral side of the reinforcing material 2 was shown.
  • the pitch is an integral multiple of the pitch of the diameter of the round wire.
  • a modification example is possible in which the wire is deformed by the winding pressure and conforms to the shape of a round wire.
  • the conductive wire and the reinforcing material can be brought into close contact with each other to ensure a bonding area.
  • one reinforcing material is inserted in the drawing, but a plurality of reinforcing materials may be inserted between the layers or between the insulating layer and the conductive wire.
  • the upper and lower insulating layers may be different from the lines.
  • the reinforcing material may be divided, but in order to obtain the effect of strengthening the adhesive strength, the size needs to span at least two lines in the column direction.
  • Example 5 is an apparatus for generating a high magnetic field using the superconducting coil of the present invention.
  • FIG. 8 is an example of a configuration diagram of the high magnetic field generation apparatus 100 of the present embodiment.
  • the main structure of the high magnetic field generator 100 of a present Example is demonstrated.
  • the high magnetic field generator 100 includes a heat insulating container 20, a superconducting coil 11 installed in the heat insulating container 20, and a refrigerant 30 in which the superconducting coil 11 is immersed.
  • the superconducting coil 11 is connected to a permanent current switch 22, a coil protection circuit 23, and an excitation power source 24 via a wiring 21.
  • a current exceeding the superconducting critical current density flows during energization of the superconducting coil 11, it is connected in parallel with the permanent current switch 22 and the excitation power supply 24 so that the coil protection circuit 23 operates.
  • liquid helium, liquid hydrogen, liquid neon, liquid nitrogen and the like, gas helium, solid nitrogen, and the like can be used.
  • a cooling means instead of the refrigerant 30, for example, a GW (Gifford McMahon) refrigerator, a GM-JT (Gifford McMahon-Jul Thomson) refrigerator, a Stirling refrigerator, a pulse tube refrigerator It is possible to use a known refrigerator such as a superconducting coil from the refrigerator via a heat transfer member.
  • the heat transfer member is, for example, an aluminum plate having a thermal conductivity of 100 W / Km or more at a temperature of 4 K to 77 K, or a metal plate such as a copper plate, or a flexible conductor thereof, or a sapphire plate or a silicon carbide plate.
  • An electrical insulating plate can be used.
  • the reel 12 may have a configuration that also has a heat transfer member.
  • the coil protection circuit 23 is described in the heat insulating container in FIG. 8, the installation place may be outside the heat insulating container.
  • the coil protection circuit 23 is composed of a resistor or a diode, for example.
  • Example 6 the superconducting coil of the present invention is used in a medical examination apparatus such as an MRI apparatus.
  • FIG. 9 is a schematic configuration diagram of the MRI apparatus of the present embodiment.
  • the figure shows a perspective view of an open type MRI apparatus.
  • reference numeral 41 denotes an electromagnet for generating a static magnetic field
  • B 0 is a static magnetic field generated by the electromagnet.
  • the superconducting coil of the present invention is used for the electromagnet.
  • a gradient magnetic field generating coil, a transmission coil, and a reception coil (not shown) are also provided.
  • MRI imaging is performed by moving the subject 42 on the bed 43 and applying a static magnetic field, a gradient magnetic field, and a high-frequency magnetic field.
  • Example 7 uses the superconducting coil of the present invention for the coil of a superconducting motor.
  • the type of superconducting motor may be a linear motor or a rotary motor. If it is a linear motor, it can be applied to a magnetic levitation railway, and if it is a rotary motor, various applications such as an electric vehicle are possible.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)
  • Superconductive Dynamoelectric Machines (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)
  • Containers, Films, And Cooling For Superconductive Devices (AREA)

Abstract

L'invention concerne une bobine supraconductrice dans laquelle le phénomène d'extinction est supprimé par la réduction de la contrainte de cisaillement pendant le refroidissement. La bobine supraconductrice comporte une partie de câble enroulé dans laquelle un câble supraconducteur est enroulé autour d'une armature d'enroulement au-dessus d'une pluralité de colonnes et d'une pluralité de couches. Un matériau de renfort est disposé entre les couches du câble supraconducteur dans la partie de câble enroulé. Le câble supraconducteur et le matériau de renfort sont intégrés par une résine. Des parties de cavité sont disposées dans des parties de coins adjacentes du câble supraconducteur.
PCT/JP2016/070031 2015-07-30 2016-07-06 Bobine supraconductrice et son procédé de production WO2017018144A1 (fr)

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JP2017531108A JP6445165B2 (ja) 2015-07-30 2016-07-06 超電導コイルおよびその製造方法

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JP2015-150708 2015-07-30
JP2015150708 2015-07-30

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111060749A (zh) * 2019-11-25 2020-04-24 北京东方计量测试研究所 一种低场量子电阻测量仪
JP2021048154A (ja) * 2019-09-17 2021-03-25 株式会社日立製作所 伝導冷却型超伝導コイル
JP2022041937A (ja) * 2020-08-31 2022-03-11 ブルーカー スウィッツァーランド アー・ゲー 超伝導電磁コイルの補強
WO2024075827A1 (fr) * 2022-10-06 2024-04-11 古河電気工業株式会社 Matériau de fil supraconducteur pour bobine supraconductrice, et bobine supraconductrice

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7402620B2 (ja) * 2019-06-03 2023-12-21 株式会社日立製作所 超電導マグネット

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JPH07192912A (ja) * 1993-12-27 1995-07-28 Toshiba Corp 超電導コイルおよびその安定性診断方法
JP2014165383A (ja) * 2013-02-26 2014-09-08 Chubu Electric Power Co Inc 超電導コイル及びその製造方法

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JPH08172013A (ja) * 1994-10-04 1996-07-02 Toshiba Corp 超電導コイルおよびその製造方法並びに超電導ワイヤ
JPH08316023A (ja) * 1995-05-18 1996-11-29 Toshiba Corp 超電導コイルおよびその製造方法
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JPS63229703A (ja) * 1987-03-19 1988-09-26 Toshiba Corp 超電導コイルの製造方法
JPH04142707A (ja) * 1990-10-04 1992-05-15 Toshiba Corp 超電導コイル
JPH07161521A (ja) * 1993-12-09 1995-06-23 Toshiba Corp 超電導電磁石及びそれに用いる自己融着超電導線の巻線機
JPH07192912A (ja) * 1993-12-27 1995-07-28 Toshiba Corp 超電導コイルおよびその安定性診断方法
JP2014165383A (ja) * 2013-02-26 2014-09-08 Chubu Electric Power Co Inc 超電導コイル及びその製造方法

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021048154A (ja) * 2019-09-17 2021-03-25 株式会社日立製作所 伝導冷却型超伝導コイル
JP7343859B2 (ja) 2019-09-17 2023-09-13 株式会社日立製作所 伝導冷却型超伝導コイル
CN111060749A (zh) * 2019-11-25 2020-04-24 北京东方计量测试研究所 一种低场量子电阻测量仪
JP2022041937A (ja) * 2020-08-31 2022-03-11 ブルーカー スウィッツァーランド アー・ゲー 超伝導電磁コイルの補強
US11506736B2 (en) 2020-08-31 2022-11-22 Bruker Switzerland Ag Reinforcement of a superconducting magnet coil
JP7189290B2 (ja) 2020-08-31 2022-12-13 ブルーカー スウィッツァーランド アー・ゲー 超伝導電磁コイルの補強
WO2024075827A1 (fr) * 2022-10-06 2024-04-11 古河電気工業株式会社 Matériau de fil supraconducteur pour bobine supraconductrice, et bobine supraconductrice

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