WO2023105974A1 - Appareil à bobine supraconductrice - Google Patents

Appareil à bobine supraconductrice Download PDF

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Publication number
WO2023105974A1
WO2023105974A1 PCT/JP2022/040181 JP2022040181W WO2023105974A1 WO 2023105974 A1 WO2023105974 A1 WO 2023105974A1 JP 2022040181 W JP2022040181 W JP 2022040181W WO 2023105974 A1 WO2023105974 A1 WO 2023105974A1
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WO
WIPO (PCT)
Prior art keywords
superconducting
superconducting coil
pcs
wire
coil
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PCT/JP2022/040181
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English (en)
Japanese (ja)
Inventor
研吾 後藤
晋士 藤田
洋太 一木
学 青木
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株式会社日立製作所
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Publication of WO2023105974A1 publication Critical patent/WO2023105974A1/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
    • H01F6/04—Cooling
    • 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
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N60/00—Superconducting devices
    • H10N60/30—Devices switchable between superconducting and normal states
    • H10N60/35—Cryotrons
    • H10N60/355—Power cryotrons
    • 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 device that is composed of a superconducting wire using a high-temperature superconductor and a persistent current switch and that realizes persistent current mode operation.
  • Superconducting magnets are used in MRI (Magnetic Resonance Imaging) devices and NMR (Nuclear Magnetic Resonance) devices. Since such equipment requires high magnetic field stability, the superconducting magnet is operated in a permanent current mode in which a closed circuit is formed only by a superconductor and current is applied. During operation, both ends of the superconducting coil are short-circuited by a persistent current switch (PCS), separated from the DC power supply, to form a closed loop with substantially zero electrical resistance.
  • PCS persistent current switch
  • Persistent current mode is a state in which current continues to flow in this closed loop for a long period of time without attenuation.
  • This PCS is composed of a superconducting wire in which a superconducting filament is embedded in a high-resistance metal base material wound around. ) and high resistance (off state).
  • magnesium diboride (MgB 2 ) is expected. Due to its high critical temperature, MgB2 can cool the superconducting magnet with a refrigerator instead of cooling with liquid helium. Furthermore, MgB2 has a smaller wire diameter than a wire using an oxide superconductor, so that the circulating current generated inside the wire is small and the magnetic field stability is high.
  • Fig. 11 shows one configuration example of a superconducting magnet.
  • the superconducting magnet has a superconducting coil 2 and a PCS 3 arranged inside a cooling container 1, which are cooled by a refrigerator via a support plate.
  • a current is supplied through the lead wire 19 from a power supply arranged on the room temperature side.
  • the superconducting coil 2 and the PCS 3 are connected by a superconducting joint 5 .
  • 12A to 12C show an example of an electric circuit between the PCS 3 and the superconducting coil 2.
  • the power supply 20 is used to excite the superconducting coil 2 while the PCS 3 is off, that is, the PCS 3 has electrical resistance. It is designed to have an electrical resistance of several ohms to several tens of ohms when the PCS3 is off.
  • the PCS 3 is turned on, that is, the PCS 3 is put into a superconducting state so that both ends of the superconducting coil 2 are short-circuited with zero electrical resistance.
  • Non-Patent Document 1 describes an example of a superconducting coil device composed of a MgB2 wire, which is a high-temperature superconductor, and a persistent current switch.
  • a superconducting coil device composed of a MgB2 wire, which is a high-temperature superconductor, and a persistent current switch.
  • Non-Patent Document 1 is a configuration in which a plurality of superconducting coil devices each including a superconducting coil and a persistent current switch are connected. There is a problem of increasing the size. Moreover, the direction of the magnetic field generated by the superconducting coil does not match the direction of the magnetic field generated by the persistent current switch. The mechanism for correcting the magnetic field can be complicated.
  • Patent Document 1 proposes a superconducting magnet in which the persistent current switch is formed in a coil shape by winding a superconducting conductor around the entire outer circumference of the superconducting coil concentrically with the superconducting coil outside the superconducting coil. It is considered that the problem of Non-Patent Document 1 can be solved by this. However, in order to apply the configuration of Patent Document 1, it is important how to connect and configure a plurality of superconducting wires. there is room for
  • An object of the present invention is to provide a superconducting coil device capable of appropriately connecting a plurality of superconducting wires.
  • the superconducting coil device of the present invention comprises a superconducting coil formed into a coil shape by winding a superconducting wire, and an excitation power source for the superconducting coil electrically connected in parallel with the superconducting coil. and a thermal persistent current switch, wherein the persistent current switch is concentrically arranged radially outside the superconducting coil, and the persistent current switch non-inductively connects a plurality of superconducting wires. It is characterized by having a superconducting connecting portion in which at least one ends of the plurality of superconducting wires are superconductingly connected to each other. Other aspects of the present invention are described in embodiments below.
  • multiple superconducting wires can be appropriately connected.
  • FIG. 4 is a diagram showing the arrangement of a superconducting coil and a persistent current switch made of a high-temperature superconductor, and showing a configuration in which the superconducting coil and the persistent current switch have different central heights in the height direction; It is the figure which showed a mode that the PCS wire is wound around the PCS coil bobbin.
  • FIG. 4 is a side view of the PCS showing the configuration after winding the PCS wire on the PCS coil bobbin.
  • 1 is a schematic diagram showing one aspect of PCS before heat treatment; FIG. FIG.
  • FIG. 3 is a plan view showing the structure of a superconducting connection container used for the folded portion of the PCS, which is the superconducting connection.
  • FIG. 5B is a cross-sectional view taken along line AA of FIG. 5A;
  • FIG. 5B is a cross-sectional view taken along line BB of FIG. 5A;
  • FIG. 10 is a cross-sectional view of a superconducting connection container in which a PCS wire having a MgB2 filament exposed by cutting a part of the metal sheath is inserted into the superconducting connection container for forming the folded portion of the PCS.
  • FIG. 5B is a cross-sectional view taken along line AA of FIG. 5A
  • FIG. 5B is a cross-sectional view taken along line BB of FIG. 5A
  • FIG. 10 is a cross-sectional view of a superconducting connection container in which a PCS wire having a MgB2 filament exposed by cutting a part of the metal
  • FIG. 3 is a cross-sectional view of a superconducting connection container for forming a folded portion of a PCS when filled with MgB 2 powder.
  • FIG. 4 is a cross-sectional view of the superconducting connection container for forming the return portion of the PCS when the MgB 2 powder of the superconducting connection container is pressurized using a pressurizing jig.
  • FIG. 10 is a diagram showing a superconducting coil and a persistent current switch made of a high-temperature superconductor according to a second embodiment, and a cooling structure thereof; It is a figure which shows the structure which arranged in multiple numbers the superconducting coil apparatus which consists of the superconducting coil which consists of a high temperature superconductor, and a permanent current switch which concerns on 3rd Embodiment.
  • 1 is a diagram showing an example of conventional superconducting coils and persistent current switches;
  • FIG. FIG. 2 is a diagram showing an example of an electric circuit diagram of a conventional superconducting coil and a persistent current switch, when the superconducting coil is excited.
  • FIG. 2 is a diagram showing an example of an electric circuit diagram of a conventional superconducting coil and a persistent current switch, during persistent current operation.
  • FIG. 4 is a diagram showing an example of an electric circuit diagram of a conventional superconducting coil and a persistent current switch, in the case of demagnetizing the superconducting coil.
  • FIG. 1 is a diagram showing the arrangement of a superconducting coil 2 made of a high-temperature superconductor and a persistent current switch (PCS 3) according to the first embodiment.
  • a superconducting coil device 10 comprises a superconducting coil 2 , a PCS 3 and a heater 4 in a cooling container 1 , and a magnetic field is generated by the superconducting coil 2 .
  • the superconducting coil device 10 has a configuration in which the PCS 3 is arranged outside the superconducting coil 2 . Furthermore, since the superconducting coil 2 and the PCS 3 are arranged concentrically, the magnetic field generated by each part is in the same direction, which is suitable for NMR systems and MRI systems that require high magnetic field stability. The mechanism for ensuring can be simplified.
  • the PCS 3 has a plurality of superconducting wires (PCS wires 22 (see FIG. 3)) wound non-inductively, and at least one end of the plurality of superconducting wires (PCS wires 22) is superconductingly connected to each other. It has a superconducting connection 5A.
  • the connection between the superconducting coil 2 and the PCS 3 has two superconducting joints 5B.
  • the structure of the heater wire need not be limited to a wire, as long as the heater wire is a heating element such as a sheet-like one that can input a desired amount of heat.
  • the superconducting coil 2 is made of a low-temperature superconductor such as NbTi, the heat from the heater is transferred to the superconducting coil, which increases the possibility of quenching the superconducting coil. needs to be increased, and the size of the superconducting coil device is increased.
  • the superconducting coil 2 is preferably a high temperature superconductor such as MgB2 wire.
  • MgB2 wire As the superconducting wire described above, a MgB2 wire will be described as an example, but a superconducting wire made of other superconducting materials such as yttrium-based or bismuth-based materials may also be used.
  • the superconducting coil 2 has a configuration called "wind and react,” in which a wire rod is wound before heat treatment to be superconductingly connected to the PCS 3. This facilitates superconducting connection with the PCS for superconducting coils wound after conventional heat treatment.
  • the size of the superconducting coil device having the persistent current operation function can be reduced. Furthermore, since the superconducting coil 2 and the PCS 3 are arranged concentrically, the magnetic field generated by each part is in the same direction, which is suitable for NMR systems and MRI systems that require high magnetic field stability. The mechanism for securing can be simplified.
  • the central portion of the superconducting coil 2 and the PCS 3 are at the same height in the height direction, but as shown in FIG. 12 and the superconducting coil center position 11 do not have the same height, a similar effect can be obtained.
  • the superconducting connection portions include the superconducting connection portion 5A and the superconducting connection portion 5B shown in FIG.
  • the superconducting connection portion 5A will be described as an example.
  • FIG. 3 shows how the PCS coil bobbin 24 is wound with a superconducting wire (hereinafter referred to as the PCS wire 22) that constitutes the PCS.
  • the arrow near the PCS wire drum 23 indicates the feeding direction of the PCS wire 22
  • the arrow near the PCS coil bobbin 24 indicates the winding direction of the PCS wire 22.
  • the PCS wire 22 is simultaneously supplied from two PCS wire drums 23 and wound around the PCS coil bobbin 24 .
  • the heater wire is wound so that the heater wire is inserted in each layer so that the PCS wire 22 and the heater wire are arranged in each layer.
  • FIG. 4A is a side view of the PCS 3 showing the configuration after winding the PCS wire 22 on the PCS coil bobbin 24.
  • FIG. 4A Since two PCS wires 22 are wound around the PCS coil bobbin 24, two PCS wire ends 25 are formed.
  • non-inductive winding is realized by superconducting connection of one of the PCS wire ends 25 .
  • FIG. 4B is a schematic diagram showing one aspect of PCS3 before heat treatment.
  • FIG. 4B is a schematic diagram showing one aspect of the PCS 3 according to the first embodiment before heat treatment, that is, before completion.
  • the PCS 3 before the heat treatment can be handled without fixing the superconducting connection portion 5A to the flange (flange portion), but the PCS 3 after the heat treatment has the superconducting connection portion 5A fixed to the flange portion. be done.
  • the superconducting connection portion 5A is fixed to the collar portion, and the heat treatment is performed to complete the PCS3.
  • FIG. 5A shows the structure of the connection container 30 used for the superconducting connection 5A.
  • FIG. 5B is a cross-sectional view taken along line AA' of FIG. 5A.
  • FIG. 5C is a cross-sectional view taken along line BB' of FIG. 5A.
  • the connecting container 30 is composed of a MgB 2 powder-filled container 31 and a pressurizing jig 32 .
  • the MgB2 powder-filled container 31 has a wire insertion part 34 for introducing the PCS wire 22 (see FIG. 4A) into the MgB2 powder-filled container 31, and the connecting container 30 to the PCS coil bobbin 24 (see FIG. 4A).
  • a connection container fixing portion 35 for fixing and a MgB 2 powder filling portion 33 for filling MgB 2 powder are provided.
  • FIG. 6 is a cross-sectional view of a superconducting connection container in which a part of the metal sheath is cut to expose the MgB2 filament and a PCS wire is inserted into the superconducting connection container for forming the folded portion of the PCS.
  • the metal sheath 27 on the surface of the PCS wire 22 including the MgB 2 superconducting filaments 36 is cut to expose the MgB 2 superconducting filaments 36 .
  • the PCS wire 22 with the MgB2 filament 26 exposed is inserted from the wire insertion part 34 provided in the MgB2 powder filling container 31, and the exposed part of the MgB2 superconducting filament 36 is positioned in the MgB2 powder filling part 33. placed like this.
  • FIG. 7 is a cross-sectional view of the superconducting connection container for forming the folded portion of the PCS when the superconducting connection container is filled with MgB 2 powder.
  • FIG. 8 is a cross-sectional view of the superconducting connecting container for forming the return part of the PCS when the MgB 2 powder of the superconducting connecting container is pressurized using a pressurizing jig.
  • the MgB2 powder 38 is filled into the MgB2 powder filling portion 33 of the MgB2 powder filling container 31 .
  • the MgB2 powder 38 is compacted by applying pressure using a pressing machine (not shown) or the like using a pressing jig 32.
  • One PCS wire end of the PCS wire 22 wound around the PCS coil bobbin 24 is provided with the superconducting connection portion 5A of the folded portion.
  • a MgB2 sintered body is formed around the two PCS wires 22, and the MgB2 superconducting filament 36 in the PCS wire 22 is connected by the MgB2 sintered body.
  • the PCS 3 described in this embodiment realizes non-inductive winding at the superconducting connection portion 5A in which a plurality of superconducting wires are superconductingly connected.
  • the folding portion of the superconducting wire is formed in this way, so there is no need to once rewound the superconducting wire on the PCS wire drum.
  • workability is improved.
  • it is not necessary to bend the superconducting wire at the folded portion of the non-inductive winding the superconducting properties of the superconducting wire are not degraded by the bending radius.
  • the superconducting connection portion 5A has been described above, it can also be applied to the superconducting connection portion 5B (see FIGS. 5A to 5C and FIGS. 6 to 8).
  • FIG. 9 is a diagram showing a superconducting coil 2 and a persistent current switch (PCS3) made of a high-temperature superconductor according to the second embodiment, and a cooling structure thereof.
  • PCS3 persistent current switch
  • a heat insulator 9 is arranged in comparison with FIG.
  • a metal 7 as a heat conductor is arranged so as to be in contact with the PCS 3 , and the heat conductor is in contact with the cooling plate 8 .
  • the metal 7 is used to prevent the heat generated by the heater 4 from flowing to the superconducting coil 2.
  • the heat is radiated to the cooling plate 8 by conduction cooling, and the heat insulating material 9 is used to suppress the temperature rise of the superconducting coil.
  • the heat insulating material 9 is, for example, styrene foam, but any material having a heat insulating function can provide the same effect.
  • copper which is a good thermal conductor, can be mentioned as a candidate, but the same effect can be obtained as long as the material has high thermal conductivity.
  • FIG. 9 does not show the superconducting joint 5B (see FIG. 1) between the superconducting coil 2 and the PCS 3, the superconducting coil 2 and the PCS 3 are connected by the superconducting joint 5B.
  • FIG. 10 is a diagram showing a configuration in which a plurality of superconducting coil devices 10 each including a superconducting coil 2 made of a high-temperature superconductor and a persistent current switch (PCS3) according to the third embodiment are arranged.
  • the third embodiment shown in FIG. 10 shows a configuration in which a plurality of superconducting coil devices 10 are combined with the central axes 15 of the superconducting coils 2 aligned.
  • a plurality of superconducting coil devices 10 are connected by solder joints 13 and arranged in cooling container 1 .
  • the superconducting coil device shown in the third embodiment is a combination of a plurality of superconducting coil devices 10, the superconducting coil devices 10 may be combined with different specifications. Moreover, although it is composed of two superconducting coil devices 10, a plurality of superconducting coil devices 10 may be combined. This combination is determined by the specifications of the superconducting magnet, and the combination and number are determined according to the specifications. Since conventional superconducting magnets have different magnetic fields depending on the product specifications, the structure of the superconducting magnet and the support structure of the superconducting magnet change. As a result, it is necessary to design each product, which may lead to a longer manufacturing period and higher costs. However, as shown in this embodiment, by combining superconducting magnets with various specifications with superconducting coil devices with different magnetic field specifications, the period required for manufacturing and development can be shortened.
  • cooling vessel 1 cooling vessel 2 superconducting coil 3 PCS (persistent current switch) 4 heater 5, 5A, 5B superconducting joint 6 support plate 7 metal (thermal conductor) 8 cooling plate 9 heat insulator 10 superconducting coil device 11 superconducting coil center position 12 persistent current switch center position 13 solder joint 14 superconducting coil device complex 19 lead wire 20 power source 21 protective resistor 22 PCS wire (superconducting wire) 23 PCS wire drum 24 PCS coil bobbin 25 PCS wire end 30 Connection container 31 MgB 2 powder filling container 32 Pressurizing jig 33 MgB 2 powder filling unit 34 Wire insertion unit 35 Connection container fixing unit 36 MgB 2 superconducting filament 38 MgB 2 powder 39 sealing material

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Containers, Films, And Cooling For Superconductive Devices (AREA)

Abstract

L'invention concerne un appareil à bobine supraconductrice (10) comprenant une bobine supraconductrice (2) formée en forme de bobine par enroulement d'un fil supraconducteur, et un commutateur de courant persistant de type thermique (PCS (3) connecté à une alimentation électrique d'excitation pour la bobine supraconductrice en parallèle avec la bobine supraconductrice. Le commutateur de courant persistant est disposé de manière concentrique à l'extérieur de la bobine supraconductrice (2). Le commutateur de courant persistant comprend une partie de connexion supraconductrice (5A) dans lequel une pluralité de fils supraconducteurs sont enroulés de manière non inductive, au moins une extrémité de la pluralité de fils supraconducteurs étant connectée ensemble de manière supraconductrice.
PCT/JP2022/040181 2021-12-10 2022-10-27 Appareil à bobine supraconductrice WO2023105974A1 (fr)

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JP2021200527A JP2023086180A (ja) 2021-12-10 2021-12-10 超電導コイル装置
JP2021-200527 2021-12-10

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS615587A (ja) * 1984-06-20 1986-01-11 Toshiba Corp 超電導スイツチ
JP2004039591A (ja) * 2002-07-08 2004-02-05 Fujikura Ltd 無誘導巻線及び永久電流スイッチ
JP4562947B2 (ja) * 2001-05-15 2010-10-13 富士電機ホールディングス株式会社 超電導磁石
JP2013225598A (ja) * 2012-04-23 2013-10-31 Hitachi Ltd ＭｇＢ２超電導マグネット
JP2019096648A (ja) * 2017-11-17 2019-06-20 株式会社東芝 超電導磁石装置の運転方法および超電導磁石装置
JP2020136637A (ja) * 2019-02-26 2020-08-31 株式会社東芝 高温超電導磁石装置
JP2021106079A (ja) * 2019-12-26 2021-07-26 株式会社日立製作所 超伝導線材、超伝導線材の製造方法およびｍｒｉ装置

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS615587A (ja) * 1984-06-20 1986-01-11 Toshiba Corp 超電導スイツチ
JP4562947B2 (ja) * 2001-05-15 2010-10-13 富士電機ホールディングス株式会社 超電導磁石
JP2004039591A (ja) * 2002-07-08 2004-02-05 Fujikura Ltd 無誘導巻線及び永久電流スイッチ
JP2013225598A (ja) * 2012-04-23 2013-10-31 Hitachi Ltd ＭｇＢ２超電導マグネット
JP2019096648A (ja) * 2017-11-17 2019-06-20 株式会社東芝 超電導磁石装置の運転方法および超電導磁石装置
JP2020136637A (ja) * 2019-02-26 2020-08-31 株式会社東芝 高温超電導磁石装置
JP2021106079A (ja) * 2019-12-26 2021-07-26 株式会社日立製作所 超伝導線材、超伝導線材の製造方法およびｍｒｉ装置

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