EP0472197B1 - High-temperature superconductive conductor winding - Google Patents

High-temperature superconductive conductor winding Download PDF

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Publication number
EP0472197B1
EP0472197B1 EP19910114090 EP91114090A EP0472197B1 EP 0472197 B1 EP0472197 B1 EP 0472197B1 EP 19910114090 EP19910114090 EP 19910114090 EP 91114090 A EP91114090 A EP 91114090A EP 0472197 B1 EP0472197 B1 EP 0472197B1
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EP
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Prior art keywords
temperature ceramic
superconductive conductor
conductor winding
superconducting wire
temperature
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Expired - Lifetime
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EP19910114090
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German (de)
French (fr)
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EP0472197A1 (en
Inventor
Kenichi C/O Osaka Works Sato
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Sumitomo Electric Industries Ltd
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Sumitomo Electric Industries Ltd
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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

Definitions

  • the present invention relates to a high-temperature superconductive conductor winding, and more specifically, it relates to improvement of properties, particularly the critical current property, of such a high-temperature superconductive conductor winding.
  • a high-temperature superconductive material which is known as a ceramic superconductor, is coated with a metal and strongly worked into a thin tape by deformation processing. It has been recognized possible to attain a high critical current density by combining such deformation processing with heat treatment.
  • a single high-temperature wire is adapted to form two coil portions. Therefore, a throughout portion (crossover portion) extending from one coil portion to the other coil portion is required.
  • the critical current density is reduced due to shearing stress which is applied to the "throughout portion", since the wire is necessarily twisted at the "throughout portion".
  • an object of the present invention is to provide a high-temperature superconductive conductor winding obtained by winding a tape-type high-temperature superconducting wire into the form of a double pancake coil, which can suppress generation of shearing stress in a crossover portion, thereby preventing reduction of the critical current density.
  • the present invention is directed to a high-temperature ceramic superconductive conductor winding obtained by winding a tape-type high-temperature ceramic superconducting wire, which is combined with a metal, into the form of a double pancake coil. According to the present invention, it is noted that the length of a crossover portion is deeply concerned with the aforementioned shearing stress, as well as the critical current density.
  • the length of a crossover portion which is provided between pancakes is selected to be at least four times the width of the tape-type high-temperature superconducting wire, in order to solve the aforementioned technical problem.
  • the high-temperature superconducting wire may be covered with an insulating material of an inorganic substance such as mica, glass fiber or quartz fiber, or an organic substance such as tetrafluoroethylene, polyimde resin or formal resin.
  • the inventive high-temperature superconductive conductor winding is preferably impregnated with epoxy resin. More preferably, the epoxy resin contains fiber and/or powder.
  • a high-temperature superconductor contained in the high-temperature superconducting wire may be divided in a multicore state.
  • the length of the crossover portion is selected to be at least four times the width of the tape-type high-temperature superconducting wire, whereby it is possible to suppress generation of shearing stress at the crossover portion, thereby preventing reduction of the critical current density caused by such shearing stress.
  • the high-temperature superconducting wire is preferably provided with an insulating coat, so that the same can be directly wound into a coil with no specific insulating material.
  • the high-temperature superconductive conductor winding according to the present invention is preferably impregnated with epoxy resin, so that the winding is resistant against stress which may be applied thereto in preparation of such a winding or during excitation.
  • the epoxy resin contains fiber and/or powder, so that the winding is further resistant against the aforementioned stress.
  • the high-temperature superconductor which is contained in the high-temperature superconducting wire is preferably divided in a multicore state, so that the high-temperature superconductor is improved in strain resistance and can be wound with no problem after sintering.
  • Figs. 1 and 2 illustrate a high-temperature superconductive conductor winding 1 according to an embodiment of the present invention.
  • Fig. 1 is a front elevational view
  • Fig. 2 is a top plan view.
  • This high-temperature superconductive conductor winding 1 is formed by winding a tape-type high-temperature superconducting wire 2, which is combined with a metal, on a cylindrical spool 3 into the form of a double pancake coil.
  • the single tape-type high-temperature superconducting wire 2 is wound on the spool 3 from its inner peripheral side to form an upper pancake, i.e., a first coil portion 4.
  • a crossover portion 5, which is connected with the beginning end of the first coil portion 4, is guided to obliquely downwardly extend on the spool 3.
  • the high-temperature superconducting wire 2 is then wound on the outer peripheral surface of the spool 3 from the inner peripheral side inversely to the first coil portion 4, thereby forming a lower pancake, i.e., a second coil portion 6.
  • clearances are defined along the first and second coil portions 4 and 6 due to formation of the crossover portion 5, while spacers 7 and 8 are inserted to absorb such clearances.
  • flanges are generally formed on both end portions thereof.
  • the term "length of the crossover portion” indicates the length of the center line of the crossover portion 5, shown in Fig. 1, in a part exposed from the first and second coil portions 4 and 6.
  • Oxides or carbonates containing Bi, Pb, Sr, Ca and Cu were so mixed that these elements were in composition ratios of 1.82:0.43:2.01:2.22:3.03, and this mixture was heat treated to prepare powder having a 2212 phase being composed of Bi, Pb, Sr, Ca and Cu substantially in the ratios of 2:2:1:2, and non-superconducting phases.
  • This powder was degassed under a decompressed atmosphere of 2 Torr at 700°C for 3 hours.
  • the as-formed powder was filled into silver pipes. 1296 such silver pipes were charged into a large silver pipe of 12 mm in outer diameter and 10 mm in inner diameter, which in turn was drawn into an outer diameter of 1 mm and then rolled into a thickness of 0.18 mm.
  • the as-formed tape-type wire was heat treated at 840°C for 50 hours, and then rolled into a tape-type wire of 4 mm in width and 0.15 mm in thickness. This tape-type wire was then heat treated at 840°C for 50 hours.
  • This tape-type wire was coated with a formal resin film of 0.1 mm in thickness and wound on a bobbin of 15 mm in outer diameter, to prepare a double pancake coil so that each pancake had ten turns.
  • Some samples of such double pancake coils were prepared with crossover portions of various lengths, to measure J C,coil /J CO (critical current density in the coil form/critical current density of the wire itself).
  • a tape-type wire of 4.3 mm in width and 0.14 mm in thickness was prepared in a similar manner to Example 1, and coated with a polyimide resin film in place of the formal resin film, to prepare a double pancake coil which was similar to Example 1. According to Example 2, the coil was impregnated with epoxy resin containing glass fiber.
  • Table 2 shows results of evaluation of the as-formed samples.
  • a single-core wire was prepared through steps similar to those of Example 1. This wire was rolled into a thickness of 0.18 mm, coated with quartz fiber, and worked into a double pancake coil, which was heat treated at 840°C for 50 hours.
  • the coil exhibited an excellent critical current density exceeding 90 % of that of the wire itself when the length of the crossover portion was set to be at least four times the width of the wire.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)

Description

    BACKGROUND OF THE INVENTION Field of the Invention
  • The present invention relates to a high-temperature superconductive conductor winding, and more specifically, it relates to improvement of properties, particularly the critical current property, of such a high-temperature superconductive conductor winding.
    • Description of the Background Art
  • A high-temperature superconductive material, which is known as a ceramic superconductor, is coated with a metal and strongly worked into a thin tape by deformation processing. It has been recognized possible to attain a high critical current density by combining such deformation processing with heat treatment.
  • In order to apply such a tape-type high-temperature superconducting wire to a coil, for example, it is necessary to wind the wire. In particular, such a tape-type high-temperature superconducting wire is properly wound into the form of a double pancake coil.
  • In such a double pancake coil, a single high-temperature wire is adapted to form two coil portions. Therefore, a throughout portion (crossover portion) extending from one coil portion to the other coil portion is required. In relation to employment of the tape-type high-temperature superconducting wire, however, it has been recognized that the critical current density is reduced due to shearing stress which is applied to the "throughout portion", since the wire is necessarily twisted at the "throughout portion".
    • SUMMARY OF THE INVENTION
  • Accordingly, an object of the present invention is to provide a high-temperature superconductive conductor winding obtained by winding a tape-type high-temperature superconducting wire into the form of a double pancake coil, which can suppress generation of shearing stress in a crossover portion, thereby preventing reduction of the critical current density.
  • The present invention is directed to a high-temperature ceramic superconductive conductor winding obtained by winding a tape-type high-temperature ceramic superconducting wire, which is combined with a metal, into the form of a double pancake coil. According to the present invention, it is noted that the length of a crossover portion is deeply concerned with the aforementioned shearing stress, as well as the critical current density.
  • In the present invention the length of a crossover portion which is provided between pancakes is selected to be at least four times the width of the tape-type high-temperature superconducting wire, in order to solve the aforementioned technical problem.
  • In the high-temperature superconductive conductor winding according to the present invention, the high-temperature superconducting wire may be covered with an insulating material of an inorganic substance such as mica, glass fiber or quartz fiber, or an organic substance such as tetrafluoroethylene, polyimde resin or formal resin.
  • The inventive high-temperature superconductive conductor winding is preferably impregnated with epoxy resin. More preferably, the epoxy resin contains fiber and/or powder.
  • A high-temperature superconductor contained in the high-temperature superconducting wire may be divided in a multicore state.
  • According to the present invention, the length of the crossover portion is selected to be at least four times the width of the tape-type high-temperature superconducting wire, whereby it is possible to suppress generation of shearing stress at the crossover portion, thereby preventing reduction of the critical current density caused by such shearing stress.
  • According to the present invention, the high-temperature superconducting wire is preferably provided with an insulating coat, so that the same can be directly wound into a coil with no specific insulating material.
  • Further, the high-temperature superconductive conductor winding according to the present invention is preferably impregnated with epoxy resin, so that the winding is resistant against stress which may be applied thereto in preparation of such a winding or during excitation. More preferably, the epoxy resin contains fiber and/or powder, so that the winding is further resistant against the aforementioned stress.
  • The high-temperature superconductor which is contained in the high-temperature superconducting wire is preferably divided in a multicore state, so that the high-temperature superconductor is improved in strain resistance and can be wound with no problem after sintering.
  • The foregoing and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings.
    • BRIEF DESCRIPTION OF THE DRAWINGS
    • Fig. 1 is a front elevational view showing a high-temperature superconductive conductor winding 1 according to an embodiment of the present invention; and
    • Fig. 2 is a top plan view of the high-temperature superconductive conductor winding 1 shown in Fig. 1.
    DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • Figs. 1 and 2 illustrate a high-temperature superconductive conductor winding 1 according to an embodiment of the present invention. Fig. 1 is a front elevational view, and Fig. 2 is a top plan view.
  • This high-temperature superconductive conductor winding 1 is formed by winding a tape-type high-temperature superconducting wire 2, which is combined with a metal, on a cylindrical spool 3 into the form of a double pancake coil.
  • In more concrete terms, the single tape-type high-temperature superconducting wire 2 is wound on the spool 3 from its inner peripheral side to form an upper pancake, i.e., a first coil portion 4. A crossover portion 5, which is connected with the beginning end of the first coil portion 4, is guided to obliquely downwardly extend on the spool 3. The high-temperature superconducting wire 2 is then wound on the outer peripheral surface of the spool 3 from the inner peripheral side inversely to the first coil portion 4, thereby forming a lower pancake, i.e., a second coil portion 6.
  • In the aforementioned wound state of the tape-type high-temperature superconducting wire 2, clearances are defined along the first and second coil portions 4 and 6 due to formation of the crossover portion 5, while spacers 7 and 8 are inserted to absorb such clearances.
  • Current-carrying terminals 9 and 10 are mounted on both end portions of the wound high-temperature superconducting wire 2.
  • While the spool 3 is simply illustrated in a cylindrical configuration, flanges (not shown) are generally formed on both end portions thereof.
  • In this specification, the term "length of the crossover portion" indicates the length of the center line of the crossover portion 5, shown in Fig. 1, in a part exposed from the first and second coil portions 4 and 6.
  • Examples which were made to confirm the effect of the present invention are now described in detail.
    • Example 1
  • Oxides or carbonates containing Bi, Pb, Sr, Ca and Cu were so mixed that these elements were in composition ratios of 1.82:0.43:2.01:2.22:3.03, and this mixture was heat treated to prepare powder having a 2212 phase being composed of Bi, Pb, Sr, Ca and Cu substantially in the ratios of 2:2:1:2, and non-superconducting phases. This powder was degassed under a decompressed atmosphere of 2 Torr at 700°C for 3 hours.
  • The as-formed powder was filled into silver pipes. 1296 such silver pipes were charged into a large silver pipe of 12 mm in outer diameter and 10 mm in inner diameter, which in turn was drawn into an outer diameter of 1 mm and then rolled into a thickness of 0.18 mm.
  • The as-formed tape-type wire was heat treated at 840°C for 50 hours, and then rolled into a tape-type wire of 4 mm in width and 0.15 mm in thickness. This tape-type wire was then heat treated at 840°C for 50 hours.
  • This tape-type wire was coated with a formal resin film of 0.1 mm in thickness and wound on a bobbin of 15 mm in outer diameter, to prepare a double pancake coil so that each pancake had ten turns. Some samples of such double pancake coils were prepared with crossover portions of various lengths, to measure JC,coil/JCO (critical current density in the coil form/critical current density of the wire itself).
  • Table 1 shows the results.
    Figure imgb0001
  • It is clearly understood from Table 1 that the property of the winding was remarkably improved when the length of the crossover portion was at least four times the width of the tape-type wire.
    • Example 2
  • A tape-type wire of 4.3 mm in width and 0.14 mm in thickness was prepared in a similar manner to Example 1, and coated with a polyimide resin film in place of the formal resin film, to prepare a double pancake coil which was similar to Example 1. According to Example 2, the coil was impregnated with epoxy resin containing glass fiber.
  • Table 2 shows results of evaluation of the as-formed samples.
    Figure imgb0002
  • It is understood from Table 2 that the effect of the present invention was further improved when the winding was impregnated with epoxy resin.
    • Example 3
  • A single-core wire was prepared through steps similar to those of Example 1. This wire was rolled into a thickness of 0.18 mm, coated with quartz fiber, and worked into a double pancake coil, which was heat treated at 840°C for 50 hours.
  • Also in this case, the coil exhibited an excellent critical current density exceeding 90 % of that of the wire itself when the length of the crossover portion was set to be at least four times the width of the wire.
  • Although the present invention has been described and illustrated in detail, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, the scope of the present invention being limited only by the terms of the appended claims.

Claims (5)

  1. A superconducting double pancake coil
    comprising
    a high-temperature ceramic superconductive conductor winding (1) which comprises a tape-type high-temperature ceramic superconducting wire (2) being combined with a metal and wound into the form of a double pancake coil, wherein
    the length of a crossover portion (5) provided between pancakes (4, 6) is at least four times the width of said tape-type high-temperature ceramic superconducting wire (2).
  2. A high-temperature ceramic superconductive conductor winding (1) in accordance with claim 1, wherein
    said high-temperature ceramic superconducting wire (2) is provided with an insulating coat.
  3. A high-temperature ceramic superconductive conductor winding (1) in accordance with claim 1, wherein
    said winding is impregnated with epoxy resin.
  4. A high-temperature ceramic superconductive conductor winding (1) in accordance with claim 3, wherein
    said epoxy resin contains fiber and/or powder.
  5. A high-temperature ceramic superconductive conductor winding (1) in accordance with claim 1, wherein
    a high-temperature ceramic superconductor contained in said high-temperature ceramic superconducting wire (2) is divided in a multicore state.
EP19910114090 1990-08-24 1991-08-22 High-temperature superconductive conductor winding Expired - Lifetime EP0472197B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP223481/91 1990-08-24
JP22348190A JP3309390B2 (en) 1990-08-24 1990-08-24 High-temperature superconducting conductor winding

Publications (2)

Publication Number Publication Date
EP0472197A1 EP0472197A1 (en) 1992-02-26
EP0472197B1 true EP0472197B1 (en) 1994-12-21

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DE (1) DE69106080T2 (en)

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US5581220A (en) * 1994-10-13 1996-12-03 American Superconductor Corporation Variable profile superconducting magnetic coil
DE69531693T3 (en) † 1994-10-13 2014-04-10 American Superconductor Corporation SUPERCONDUCTIVE MAGNETIC COIL WITH VARIABLE PROFILE
US5604473A (en) * 1994-10-13 1997-02-18 American Superconductor Corporation Shaped superconducting magnetic coil
DE19502549A1 (en) * 1995-01-27 1996-08-01 Siemens Ag Magnet device with forced superconducting winding to be cooled
JP4622020B2 (en) * 1999-02-26 2011-02-02 住友電気工業株式会社 Oxide superconducting wire having insulating coating and method for producing the same
ATE373310T1 (en) * 2000-02-04 2007-09-15 Iwate Tokyo Wire Works Ltd COVERED SUPERCONDUCTING WIRE
DE102004011940A1 (en) * 2004-03-09 2005-09-29 Thyssenkrupp Transrapid Gmbh Magnetic pole for magnetic levitation vehicle
DE102005052602B3 (en) * 2005-11-02 2007-03-08 Trithor Gmbh Coil for producing magnetic field, e.g. for motor or generator, has reinforcement insert enclosing superconducting winding and enclosed in plastics
FR2895802B1 (en) 2005-12-30 2008-11-07 Commissariat Energie Atomique METHOD AND DEVICE FOR CREATING A HOMOGENEOUS MAGNETIC FIELD IN A ZONE OF INTEREST, IN PARTICULAR FOR NMR IMAGING
JP2008026234A (en) * 2006-07-24 2008-02-07 Sumitomo Electric Ind Ltd Method and detector for detecting defective insulation
JP2008130785A (en) * 2006-11-21 2008-06-05 Sumitomo Electric Ind Ltd Superconducting coil and superconducting apparatus equipped with the same
JP4893301B2 (en) * 2006-12-28 2012-03-07 住友電気工業株式会社 Superconducting coil manufacturing method
JP2010093036A (en) * 2008-10-08 2010-04-22 Sumitomo Electric Ind Ltd Superconducting coil, superconducting magnet, epoxy resin varnish and method for manufacturing them
DE102010040272B4 (en) * 2010-09-06 2018-04-19 Siemens Aktiengesellschaft High temperature superconductor (HTS) coil
DE102011079323B3 (en) * 2011-07-18 2013-01-03 Siemens Aktiengesellschaft Superconducting coil assembly used in superconductive electric machine e.g. high-temperature superconductor (HTS) motor, has impermeable belt provided in the separation layer, which is wound around the HTS material in coil winding
JP6539024B2 (en) * 2014-08-08 2019-07-03 住友電気工業株式会社 Coil and coil component
JP2020047739A (en) * 2018-09-18 2020-03-26 株式会社東芝 Superconducting coil and superconducting device

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US3281737A (en) * 1963-09-26 1966-10-25 Gen Electric Superconductive solenoid
US3813764A (en) * 1969-06-09 1974-06-04 Res Inst Iron Steel Method of producing laminated pancake type superconductive magnets
JPS5732607A (en) * 1980-08-05 1982-02-22 Japan Atom Energy Res Inst Superconductive coil
US4499443A (en) * 1984-01-31 1985-02-12 The United States Of America As Represented By The United States Department Of Energy High-field double-pancake superconducting coils and a method of winding

Also Published As

Publication number Publication date
EP0472197A1 (en) 1992-02-26
JP3309390B2 (en) 2002-07-29
JPH04106906A (en) 1992-04-08
DE69106080D1 (en) 1995-02-02
DE69106080T2 (en) 1995-05-18

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