EP2885792A1 - Superconducting coil device comprising a coil winding - Google Patents
Superconducting coil device comprising a coil windingInfo
- Publication number
- EP2885792A1 EP2885792A1 EP13779543.1A EP13779543A EP2885792A1 EP 2885792 A1 EP2885792 A1 EP 2885792A1 EP 13779543 A EP13779543 A EP 13779543A EP 2885792 A1 EP2885792 A1 EP 2885792A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coil
- segments
- adjacent
- coil device
- winding
- 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
Links
- 238000004804 winding Methods 0.000 title claims abstract description 75
- 239000004020 conductor Substances 0.000 claims abstract description 56
- 239000000758 substrate Substances 0.000 claims abstract description 14
- 239000000463 material Substances 0.000 claims description 24
- 238000004382 potting Methods 0.000 claims description 24
- 150000001875 compounds Chemical class 0.000 claims description 19
- 238000001816 cooling Methods 0.000 claims description 17
- 239000000853 adhesive Substances 0.000 claims description 11
- 230000001070 adhesive effect Effects 0.000 claims description 11
- 239000003795 chemical substances by application Substances 0.000 claims description 11
- 230000007704 transition Effects 0.000 claims description 11
- 239000002887 superconductor Substances 0.000 claims description 8
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 241000954177 Bangana ariza Species 0.000 claims description 3
- 239000010410 layer Substances 0.000 description 41
- 239000012212 insulator Substances 0.000 description 10
- 230000008602 contraction Effects 0.000 description 9
- SZUVGFMDDVSKSI-WIFOCOSTSA-N (1s,2s,3s,5r)-1-(carboxymethyl)-3,5-bis[(4-phenoxyphenyl)methyl-propylcarbamoyl]cyclopentane-1,2-dicarboxylic acid Chemical compound O=C([C@@H]1[C@@H]([C@](CC(O)=O)([C@H](C(=O)N(CCC)CC=2C=CC(OC=3C=CC=CC=3)=CC=2)C1)C(O)=O)C(O)=O)N(CCC)CC(C=C1)=CC=C1OC1=CC=CC=C1 SZUVGFMDDVSKSI-WIFOCOSTSA-N 0.000 description 8
- 229940126543 compound 14 Drugs 0.000 description 8
- 230000015572 biosynthetic process Effects 0.000 description 7
- 239000010949 copper Substances 0.000 description 7
- 239000004810 polytetrafluoroethylene Substances 0.000 description 7
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 7
- 238000005266 casting Methods 0.000 description 4
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 230000032798 delamination Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 229910052761 rare earth metal Inorganic materials 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910001080 W alloy Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000005490 dry winding Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 150000002118 epoxides Chemical class 0.000 description 1
- 125000003700 epoxy group Chemical group 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- -1 for example Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 1
- 229910000856 hastalloy Inorganic materials 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- MOWMLACGTDMJRV-UHFFFAOYSA-N nickel tungsten Chemical compound [Ni].[W] MOWMLACGTDMJRV-UHFFFAOYSA-N 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920003223 poly(pyromellitimide-1,4-diphenyl ether) Polymers 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- 238000004046 wet winding Methods 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
- 239000000080 wetting agent Substances 0.000 description 1
Classifications
-
- 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
- H01F41/048—Superconductive coils
-
- 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
Definitions
- the present invention relates to a coil device comprising a coil winding of a superconducting band conductor.
- HTS high-temperature superconductors or even high-T c superconductors
- These HTS conductors are typically in the form of flat strip conductors which form a band-shaped substrate strip and a superconducting layer disposed on the substrate tape.
- the band conductors often have further layers such as stabilization layers, buffer layers and in some cases also insulation layers.
- HTS conductors of the second generation are compounds of the type RE-Ba 2 Cu 3 O x , where RE stands for a rare-earth element or a mixture of such elements.
- RE stands for a rare-earth element or a mixture of such elements.
- Many superconducting tape conductors with such ceramic superconducting layers are very sensitive to mechanical stresses and therefore must be protected from mechanical stresses such as tensile, compressive or shear stresses during manufacture as well as during operation of the superconducting coils. If electrical coils are produced from superconducting strip conductors, then successive windings of the strip conductors are typically either glued together during winding by an impregnating resin, or wrapped coil is then potted with a casting agent.
- Typical casting agents here are epoxy resins, with which the coil can be cast, for example, with a Vakuumvergussclar.
- the gluing or casting of the coil turns causes the finished coil to be protected from mechanical stresses, for example due to Lorentz forces in strong magnetic fields and / or due to centrifugal forces during fast rotation.
- a problem with the use of superconducting coils is the differential thermal contraction of the various materials in the coils during cooling to operating temperature. When cooling to an operating temperature of, for example, 30 K to 70 K, especially the polymeric constituents of the adhesive and / or the potting compound as well as possibly existing
- Insulator materials of a greater thermal shrinkage than the metallic and ceramic components of the strip conductor are used to form stresses during and after cooling, which can result in damage to the superconducting layer.
- the use of a winding carrier with a greater thermal contraction than that of the strip conductor can cause the formation of radial tensile stresses perpendicular to the plane of the strip conductor and thus a compression of the superconducting layer.
- the radial tensile stresses lead much easier than any radial compressive stresses to damage the superconducting properties to a delamination of the superconducting layer of the substrate of the strip conductor.
- a radial pull causes the inside
- the object of the present invention is to provide a superconducting coil device which avoids the disadvantages mentioned.
- the coil device according to the invention when cooled down to its operating temperature, to have a substantially reduced radial tensile stress of the strip conductor. has.
- the subdivision into segments causes the coil winding according to the invention at its operating temperature to have a substantially reduced tensile stress in the strip conductor, which is advantageously in the range of the tensile stress which the strip conductor of a coil with the number of turns of a single segment would have ,
- the invention is therefore based on the finding that the voltage caused by thermal shrinkage increases with the number of turns, and that this increase can be reduced by dividing into loosely connected segments.
- the operating temperature of the superconductor is for example between 25 K and 77 K.
- the coil device may additionally have the following features:
- the adjacent windings may be connected at least in one subarea with such a weak adhesive that the connection is separated at a tension below 10 MPa.
- the weak connection in the subregion is designed so that a radial tensile stress occurring on cooling of the superconductor to its operating temperature leads to a separation of the compound in this subregion before the tensile stress can cause damage or even delamination of the superconducting layer ,
- the separation of the compound even at 5 MPa, particularly advantageous at 3 MPa.
- 2G-HTS materials can withstand a tensile stress of several MPa.
- At least a portion of the gap between adjacent turns may be free of adhesive bonding or potting compound.
- the coil means may comprise a potting compound that envelops the adjacent turns within the segments.
- This potting compound may advantageously be an epoxide.
- the same potting compound may also be present between the segments in those sections that are outside the subregions with at most weakly connected adjacent turns.
- the coil device at least in a partial region of the intermediate region between two adjacent segments, has a coating with a
- the coating or the inserted tape of a release agent then advantageously prevent wetting with the potting compound or the adhesive in these areas, so that then the potting or bonding is either completely prevented or the bond in comparison to other areas of the winding only extremely weak - is imprinted.
- the release agent may advantageously be PTFE.
- the strip conductor in the intermediate region between two adjacent segments, can be provided with an additional layer at least in a partial region, which is formed from a material with a smaller thermal expansion coefficient than the effective thermal expansion coefficient of the strip conductor. It is advantageous if the thermal shrinkage of the additional layer by cooling to the operating temperature is below 0.3%, particularly advantageously below 0.1%. In this embodiment, there is no void between the adjacent segments in the said subregion because the region between the unconnected or weakly connected regions is formed. Tied tape ladders will now be less strong
- the additional layer can be formed from graphite, which has a very low thermal expansion coefficient.
- the material for the additional layer has a negative coefficient of thermal expansion.
- the band conductor in the intermediate region between two adjacent segments, can be provided, at least in one subregion, with an additional layer which is formed from a flexible material with a tensile strength of less than 10 MPa.
- the tensions between the segments may be obtained by yielding the flexible material of the additional ones
- the adjacent strip conductors are still weakly connected in this area, then the weak connection can advantageously remain even after cooling.
- the coil winding is mechanically more stable than in the complete absence of connection and in the formation of cavities.
- the coil winding may be formed as a racing track coil or as a rectangular coil.
- the winding can shrink relatively stress-relieved. This is comparable to the thermal shrinkage of a flat stack of tape conductors in which differences in the thermal expansion coefficients of the different materials can be compensated for by varying degrees of contraction in the tape conductor plane and perpendicular to the tape conductor plane.
- the sub-regions with at most weak connection of the adjacent turns of adjacent segments may be within the regions comprising the curved regions of the coil winding and transition regions bordering on both sides.
- straight transition areas are provided in which there is at most a weak connection between the segments.
- the coil winding may be formed as an approximately cylindrical winding, and the segments may be formed as radial segments.
- the coil device is designed as a cylindrical winding with radial segments, then the subregions can extend with at most weak connection of the adjacent turns over at least one full turn of 360 degrees.
- This embodiment has the advantage that a radial tensile stress that arises between the segments as a result of cooling is compensated as far as possible.
- the effective strain relief due to the weak connection between the segments is particularly effective wherever the coil winding is curved, ie in the case of a cylindrical coil over the entire circumference of the coil.
- High-temperature superconductors of the second generation include.
- FIG. 2 shows a detail of a coil winding according to a th embodiment
- FIG. 3 shows a coil winding according to a second embodiment, for example in a schematic plan view.
- the strip conductor comprises a substrate strip 2, which here is a 100 ⁇ m thick substrate made from a nickel-tungsten alloy. Alternatively, steel bands or bands of an alloy such as Hastelloy can be used.
- a 0.5 ⁇ thick buffer layer 4 is arranged, which contains the oxidic materials Ce0 2 and Y 2 0 3 here .
- the actual superconducting layer 6, here a 1 ⁇ thick layer of YBa 2 Cu 3 0 x which in turn is covered with a 50 ⁇ thick cover layer 8 of copper.
- the strip conductor 1 can also be used on both outer surfaces Insulator layers include, or it may also be the side regions of the superconducting strip conductor 1 protected by insulating layers. It is furthermore possible to wrap an insulator tape in the coil device as a separate strip only during the production of the coil winding. This is particularly advantageous when several strip conductors are wound in parallel, which need not be isolated from each other. Then, for example, a packet of 2 to 6 superimposed strip conductors without their own insulator layer can be wound together with an additionally inserted insulator strip in common turns.
- the substrate tape 2, the buffer layer 4, the superconducting layer 6 and the cover layers 8 in their entirety undergo a thermal contraction of about 0.3% when cooling from about 300 K to about 30 K.
- the thermal contraction is much higher, at about 1.2%.
- these differences can be compensated for by varying in-plane shrinkage and perpendicular to the plane of the strip conductor. In the curved areas, however, they lead to the formation of radial tensile stresses. In the following two embodiments it is shown how the radial tensile stresses can be reduced by the division into segments.
- each segment includes even more than the three turns exemplified.
- each segment may comprise between 10 and 200 turns, more preferably between 50 and 100 turns.
- Impregnating resin or an adhesive can be introduced (so-called wet winding), wherein the band conductor is typically wetted on both sides with the impregnating resin or adhesive before winding.
- wet winding the adjacent turns Wi-i, Wi are shed in several subsections in this embodiment.
- the four straight sections 28 of the rectangular coil two are shown schematically in Fig. 2. Within these sections 28 all turns Wi of the entire coil with the potting compound 14 are firmly connected to each other, even in the intermediate region 20 between two adjacent segments S ⁇ , S ⁇ +1 .
- the adjacent turns Wi_i, Wi of different segments S ⁇ , S ⁇ +1 are not connected to one another by potting compound 14.
- a PTFE tape 16 is inserted in this entire sub-region 22 between the segments S ⁇ , S ⁇ +1 , which prevents filling of this sub-region 22 with potting compound 14 during the casting of the wound coil.
- FIG. 3 shows a second coil winding 30 according to a second exemplary embodiment in a schematic plan view.
- This second coil winding 30 is formed as an approximately cylindrical winding, in which example the cylindrical shape is composed only approximately of straight portions 32 and curved portions 24.
- the coil winding comprises in each case eight straight regions 22 and eight curved regions 24, although the number of individual regions can also be significantly greater.
- the coil winding comprises only two segments Si and Si + 1.
- the number of segments can also be significantly greater, for example, it can be between 2 and 50 and more preferably between 5 and 10.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Superconductors And Manufacturing Methods Therefor (AREA)
- Coils Or Transformers For Communication (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102012219899.7A DE102012219899A1 (en) | 2012-10-31 | 2012-10-31 | Superconductive coil device with coil winding |
PCT/EP2013/071152 WO2014067759A1 (en) | 2012-10-31 | 2013-10-10 | Superconducting coil device comprising a coil winding |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2885792A1 true EP2885792A1 (en) | 2015-06-24 |
EP2885792B1 EP2885792B1 (en) | 2019-09-04 |
Family
ID=49447530
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP13779543.1A Active EP2885792B1 (en) | 2012-10-31 | 2013-10-10 | Superconducting coil device comprising a coil winding |
Country Status (5)
Country | Link |
---|---|
US (1) | US9721707B2 (en) |
EP (1) | EP2885792B1 (en) |
KR (1) | KR102050345B1 (en) |
DE (1) | DE102012219899A1 (en) |
WO (1) | WO2014067759A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102015001746A1 (en) * | 2015-02-11 | 2016-08-11 | Karlsruher Institut für Technologie | Rail-bound maglev train |
EP3747033B1 (en) * | 2018-02-01 | 2022-03-02 | Tokamak Energy Ltd | Partially-insulated hts coils |
DE102019202053A1 (en) * | 2019-02-15 | 2020-08-20 | Siemens Aktiengesellschaft | Coil element and electric machine |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2434451C2 (en) * | 1974-07-17 | 1982-11-25 | Siemens AG, 1000 Berlin und 8000 München | Internal contact between two coils in adjacent winding layers of a superconducting magnet winding |
JP4752744B2 (en) * | 2006-11-30 | 2011-08-17 | 住友電気工業株式会社 | Superconducting coil |
JP4864785B2 (en) * | 2007-03-27 | 2012-02-01 | 株式会社東芝 | High-temperature superconducting wire, high-temperature superconducting coil and manufacturing method thereof |
JP5259487B2 (en) * | 2009-05-15 | 2013-08-07 | 株式会社東芝 | Superconducting coil |
JP5823116B2 (en) * | 2010-11-15 | 2015-11-25 | 株式会社東芝 | Superconducting coil |
DE102011077457B4 (en) | 2011-06-14 | 2017-09-28 | Siemens Ag | Method for producing a coil with coil winding |
-
2012
- 2012-10-31 DE DE102012219899.7A patent/DE102012219899A1/en not_active Withdrawn
-
2013
- 2013-10-10 KR KR1020157013742A patent/KR102050345B1/en active IP Right Grant
- 2013-10-10 WO PCT/EP2013/071152 patent/WO2014067759A1/en active Application Filing
- 2013-10-10 US US14/439,617 patent/US9721707B2/en active Active
- 2013-10-10 EP EP13779543.1A patent/EP2885792B1/en active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2014067759A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP2885792B1 (en) | 2019-09-04 |
US20150279533A1 (en) | 2015-10-01 |
KR102050345B1 (en) | 2019-11-29 |
DE102012219899A1 (en) | 2014-04-30 |
US9721707B2 (en) | 2017-08-01 |
KR20150079814A (en) | 2015-07-08 |
WO2014067759A1 (en) | 2014-05-08 |
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