EP0472197A1 - High-temperature superconductive conductor winding - Google Patents

High-temperature superconductive conductor winding Download PDF

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Publication number
EP0472197A1
EP0472197A1 EP91114090A EP91114090A EP0472197A1 EP 0472197 A1 EP0472197 A1 EP 0472197A1 EP 91114090 A EP91114090 A EP 91114090A EP 91114090 A EP91114090 A EP 91114090A EP 0472197 A1 EP0472197 A1 EP 0472197A1
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EP
European Patent Office
Prior art keywords
temperature
superconducting wire
tape
conductor winding
superconductive conductor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP91114090A
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German (de)
French (fr)
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EP0472197B1 (en
Inventor
Kenichi C/O Osaka Works Sato
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Electric Industries Ltd
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Sumitomo Electric Industries Ltd
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Publication date
Application filed by Sumitomo Electric Industries Ltd filed Critical Sumitomo Electric Industries Ltd
Publication of EP0472197A1 publication Critical patent/EP0472197A1/en
Application granted granted Critical
Publication of EP0472197B1 publication Critical patent/EP0472197B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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 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 throughout portion, thereby preventing reduction of the critical current density.
  • the present invention is directed to a high-temperature superconductive conductor winding obtained by winding a tape-type high-temperature 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 throughout portion is deeply concerned with the aforementioned shearing stress, as well as the critical current density.
  • the present invention is characterized in that the length of a throughout 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 throughout 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 throughout 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 throughout 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 throughout portion 5, while spacers 7 and 8 are inserted to absorb such clearances.
  • flanges are generally formed on both end portions thereof.
  • length of the throughout portion indicates the length of the center line of the throughout 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 throughout 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).
  • Table 1 shows the results. Table 1 Length of Throughout J C,coil /J CO 2.7 x width 0.57 3.5 x width 0.74 4.3 x width 0.93 6.1 x width 0.95
  • 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. Table 2 Length of Throughout J C,coil /J CO 2.6 x width 0.59 3.4 x width 0.77 4.5 x width 0.97 6.0 x width 0.98
  • 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 throughout 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)

Abstract

In a high-temperature superconductive conductor winding (1) comprising a tape-type high-temperature superconducting wire (2) which is combined with a metal and wound into the form of a double pancake coil, the length of a throughout portion (5) provided between pancakes (4, 6) is at least four times the width of the tape-type high-temperature superconducting wire. Thus, it is possible to suppress generation of shearing stress at the throughout portion (5), thereby preventing reduction of the critical current density caused by such shearing stress.

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 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 throughout portion, thereby preventing reduction of the critical current density.
  • The present invention is directed to a high-temperature superconductive conductor winding obtained by winding a tape-type high-temperature 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 throughout portion is deeply concerned with the aforementioned shearing stress, as well as the critical current density.
  • The present invention is characterized in that the length of a throughout 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 throughout 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 throughout 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 throughout 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 throughout 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 throughout portion" indicates the length of the center line of the throughout 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 throughout 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. Table 1
    Length of Throughout JC,coil/JCO
    2.7 x width 0.57
    3.5 x width 0.74
    4.3 x width 0.93
    6.1 x width 0.95
  • It is clearly understood from Table 1 that the property of the winding was remarkably improved when the length of the throughout 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. Table 2
    Length of Throughout JC,coil/JCO
    2.6 x width 0.59
    3.4 x width 0.77
    4.5 x width 0.97
    6.0 x width 0.98
  • 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 throughout 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 high-temperature superconductive conductor winding comprising a tape-type high-temperature superconducting wire being combined with a metal and wound into the form of a double pancake coil, wherein
       the length of a throughout portion provided between pancakes is at least four times the width of said tape-type high-temperature superconducting wire.
  2. A high-temperature superconductive conductor winding in accordance with claim 1, wherein said high-temperature superconducting wire is provided with an insulating coat.
  3. A high-temperature superconductive conductor winding in accordance with claim 1, wherein said winding is impregnated with epoxy resin.
  4. A high-temperature superconductive conductor winding in accordance with claim 3, wherein said epoxy resin contains fiber and/or powder.
  5. A high-temperature superconductive conductor winding in accordance with claim 1, wherein a high-temperature superconductor contained in said high-temperature superconducting wire 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)

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

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JP (1) JP3309390B2 (en)
DE (1) DE69106080T2 (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0724273A2 (en) * 1995-01-27 1996-07-31 Siemens Aktiengesellschaft Magnet device with superconducting winding to be cooled by enforced cooling
US5581220A (en) * 1994-10-13 1996-12-03 American Superconductor Corporation Variable profile superconducting magnetic coil
US5604473A (en) * 1994-10-13 1997-02-18 American Superconductor Corporation Shaped superconducting magnetic coil
EP0786141A1 (en) † 1994-10-13 1997-07-30 American Superconductor Corporation Variable profile superconducting magnetic coil
WO2000052781A1 (en) * 1999-02-26 2000-09-08 Sumitomo Electric Industries, Ltd. Oxide superconducting wire having insulating coat and production method thereof
WO2001057888A1 (en) * 1998-07-23 2001-08-09 Iwate Tokyo Wire Works, Ltd. Covered superconductive wire
WO2005087532A1 (en) * 2004-03-09 2005-09-22 Thyssenkrupp Transrapid Gmbh Magnetic pole for magnetic levitation vehicles
FR2895802A1 (en) * 2005-12-30 2007-07-06 Commissariat Energie Atomique Homogenous magnetic field generating device for e.g. magnetic resonance imaging installation, has plane single pancake coils with ends, and transition section providing shift equal to transverse dimension of conductor along horizontal axis
EP1829062B1 (en) * 2005-11-02 2011-02-09 Zenergy Power GmbH Coil for producing a magnetic field
WO2012031790A1 (en) * 2010-09-06 2012-03-15 Siemens Aktiengesellschaft High-temperature superconductor (hts) coil

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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
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

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
EP0045604A2 (en) * 1980-08-05 1982-02-10 Mitsubishi Denki Kabushiki Kaisha Method for producing a 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

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
EP0045604A2 (en) * 1980-08-05 1982-02-10 Mitsubishi Denki Kabushiki Kaisha Method for producing a 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

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0786141B2 (en) † 1994-10-13 2013-10-23 American Superconductor Corporation Variable profile superconducting magnetic coil
US5581220A (en) * 1994-10-13 1996-12-03 American Superconductor Corporation Variable profile superconducting magnetic coil
US5604473A (en) * 1994-10-13 1997-02-18 American Superconductor Corporation Shaped superconducting magnetic coil
EP0786141A1 (en) † 1994-10-13 1997-07-30 American Superconductor Corporation Variable profile superconducting magnetic coil
EP0724273A3 (en) * 1995-01-27 1996-10-16 Siemens Ag Magnet device with superconducting winding to be cooled by enforced cooling
EP0724273A2 (en) * 1995-01-27 1996-07-31 Siemens Aktiengesellschaft Magnet device with superconducting winding to be cooled by enforced cooling
WO2001057888A1 (en) * 1998-07-23 2001-08-09 Iwate Tokyo Wire Works, Ltd. Covered superconductive wire
WO2000052781A1 (en) * 1999-02-26 2000-09-08 Sumitomo Electric Industries, Ltd. Oxide superconducting wire having insulating coat and production method thereof
EP1096580A1 (en) * 1999-02-26 2001-05-02 Sumitomo Electric Industries, Ltd. Oxide superconducting wire having insulating coat and production method thereof
EP1096580A4 (en) * 1999-02-26 2006-04-05 Sumitomo Electric Industries Oxide superconducting wire having insulating coat and production method thereof
WO2005087532A1 (en) * 2004-03-09 2005-09-22 Thyssenkrupp Transrapid Gmbh Magnetic pole for magnetic levitation vehicles
US7855628B2 (en) 2004-03-09 2010-12-21 Thyssenkrupp Transrapid Gmbh Magnet pole for magnetic levitation vehicles
EP1829062B1 (en) * 2005-11-02 2011-02-09 Zenergy Power GmbH Coil for producing a magnetic field
WO2007077383A1 (en) * 2005-12-30 2007-07-12 Commissariat A L'energie Atomique Method and device for generating a homogeneous magnetic field in an area of interest, especially for nmr imaging
US7952454B2 (en) 2005-12-30 2011-05-31 Commissariat A L'energie Atomique Et Aux Energies Alternatives Method and device for generating a homogeneous magnetic field in an area of interest, especially for NMR imaging
FR2895802A1 (en) * 2005-12-30 2007-07-06 Commissariat Energie Atomique Homogenous magnetic field generating device for e.g. magnetic resonance imaging installation, has plane single pancake coils with ends, and transition section providing shift equal to transverse dimension of conductor along horizontal axis
WO2012031790A1 (en) * 2010-09-06 2012-03-15 Siemens Aktiengesellschaft High-temperature superconductor (hts) coil
US20130172196A1 (en) * 2010-09-06 2013-07-04 Wolfgang Nick High-temperature superconductor (hts) coil
US9048015B2 (en) * 2010-09-06 2015-06-02 Siemens Aktiengesellschaft High-temperature superconductor (HTS) coil

Also Published As

Publication number Publication date
JP3309390B2 (en) 2002-07-29
JPH04106906A (en) 1992-04-08
EP0472197B1 (en) 1994-12-21
DE69106080D1 (en) 1995-02-02
DE69106080T2 (en) 1995-05-18

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