EP2987173B1 - Supraleitende spuleneinrichtung mit spulenwicklung und herstellungsverfahren - Google Patents

Supraleitende spuleneinrichtung mit spulenwicklung und herstellungsverfahren Download PDF

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Publication number
EP2987173B1
EP2987173B1 EP14729237.9A EP14729237A EP2987173B1 EP 2987173 B1 EP2987173 B1 EP 2987173B1 EP 14729237 A EP14729237 A EP 14729237A EP 2987173 B1 EP2987173 B1 EP 2987173B1
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EP
European Patent Office
Prior art keywords
winding
strip conductor
contact
conductor
coil
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EP14729237.9A
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German (de)
English (en)
French (fr)
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EP2987173A1 (de
Inventor
Otto Batz
Werner Herkert
Anne KUHNERT
Peter Kummeth
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Siemens AG
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Siemens AG
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F6/00—Superconducting magnets; Superconducting coils
    • H01F6/06—Coils, e.g. winding, insulating, terminating or casing arrangements therefor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
    • H01F41/048—Superconductive coils
    • 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
    • H01F41/06—Coil winding
    • H01F41/064—Winding non-flat conductive wires, e.g. rods, cables or cords
    • H01F41/069—Winding two or more wires, e.g. bifilar winding
    • H01F41/07—Twisting

Definitions

  • the present invention relates to a superconductive coil device having at least one multi-turn coil winding of a superconducting tape conductor. Furthermore, the invention relates to a manufacturing method for such a superconducting coil device.
  • HTS high-temperature superconductors or even high-T c superconductors
  • band conductors often have further layers such as stabilization layers, contact layers, buffer layers and in some cases also insulation layers.
  • the most important material class of the so-called second-generation HTS conductors (2G-HTS) are compounds of the type REBa 2 Cu 3 O x , where RE stands for a rare-earth element or a mixture of such elements.
  • the substrate tape is typically either steel or alloy Hastelloy.
  • the electrical contact to an external circuit is usually made via a contact layer of copper, wherein this contact layer is either applied on one side over the superconducting layer or can surround the entire band conductor as an enveloping layer. In both versions, it is better to contact on the Side of the substrate strip, which carries the superconducting layer. This page of the strip conductor is referred to below as the contact page.
  • a filler such as Teflon must be used first to keep the point to be contacted of adhesive free. After removal of the filler can be made for contacting this point, for example, a solder joint to a contact piece of copper. But since this contact is within the winding, the contact area must be subsequently fixed with bandages of glass fiber reinforced plastic and epoxy adhesive to produce the necessary mechanical stability.
  • a superconducting coil winding is provided with at least two strip conductors, each having a contact side exhibit.
  • the first and the second band conductors are electrically connected via an inner contact between their contact sides.
  • the first and the second band conductors differ in their orientation with respect to the center of the coil, so that the orientation of the contact side is turned through this inner contact. This allows a freely accessible contacting the contact side both on the inside and on the outside of the coil winding.
  • the disadvantage of the coil winding specified there, however, is that the additional inner contact creates a further normally conducting connection within the coil, so that the superconducting properties of the coil are interrupted in its interior, and there electrical losses associated with higher heat generation occur.
  • Object of the present invention is to provide a coil device which avoids the disadvantages mentioned. Another object is to provide a method for producing such a coil device.
  • the coil device comprises at least one coil winding with at least one winding of at least one superconducting strip conductor.
  • the strip conductor has a first conductor surface, which is designed as a contact side and is provided with a contact layer.
  • the tape conductor is twisted about a longitudinal axis of the tape conductor by at least one turn in a torsion region about 180 degrees, and the contact side of the tape conductor faces an inner side of the winding toward a center of the winding and faces away from the center of the winding on an outer side of the winding.
  • the torsion of the strip conductor about its longitudinal axis within the coil winding is achieved that in a simple winding of typically a plurality of surface superimposed windings both on the inside of the winding and on the outside of the winding, the side of the strip conductor with the low-resistance contact with the superconducting Layer comes to lie outside.
  • unnecessary additional torsion within the winding of a superconducting tape conductor is rather avoided, since such a torsion can lead to internal stresses of the layer materials up to the delamination and the loss of the superconducting properties.
  • the superconducting coil means may comprise HTS materials of the second generation, in particular the above-mentioned compounds of the type REBa 2 Cu 3 O x .
  • Second generation HTS materials are also advantageous because they have higher tensile strength and higher critical current density than first generation HTS materials.
  • a significant advantage compared to the solution disclosed in 102012223366.0 is that no additional normal conducting soldering must be introduced into the winding.
  • the entire coil winding may be formed with either one or more parallel superconducting conductive tracks which may extend over the entire radial area of the coil winding.
  • the individual strip conductors of the stack can either be twisted one at a time sequentially or they can be twisted as a whole in the form of the entire stack.
  • the coil device according to the invention comprises a coil winding with a plurality of turns, but also applications are possible in which the advantage according to the invention of the torsion of the strip conductor already comes into play in a single turn.
  • a superconducting strip conductor is wound in several turns on a winding support.
  • the strip conductor has a first conductor surface, which is designed as a contact side and is provided with a contact layer.
  • the contact side of the strip conductor is at the beginning of the winding to the winding support and thus facing a center of the winding.
  • the strip conductor is twisted about a longitudinal axis of the strip conductor by at least one of the turns in a torsion region about 180 degrees, and the contact side of the strip conductor faces away from the center of the winding on an outside of the winding.
  • the advantages of the manufacturing process are partly analogous to the advantages of the superconducting coil device according to the invention. Further advantages are in the simplified manufacturing process compared to the production of a coil device with an additional inner contact for changing the orientation of the strip conductor. In a twist of the strip conductor by torsion, on the one hand, the additional process step for producing the inner contact connection is avoided.
  • the winding can be done with a higher winding tension, if not mechanically sensitive internal soldering contact is present.
  • the winding process can also be carried out more easily and faster if only a single strip conductor or a package of parallel strip conductors has to be wound without additional internal soldering contact. Above all, the winding process is easier because no additional preparatory process steps are necessary without an internal soldering contact. In particular, no additional Umspulariae to provide the wound strip conductor or the package to be wrapped several band conductor on a supply reel necessary.
  • the coil device may additionally comprise the following features:
  • the superconductive coil device may comprise a first contact between the contact side of the strip conductor and an inner contact piece on an inner side of the coil winding and a second contact between the contact side of the strip conductor and an outer contact piece on an outer side of the coil winding for connecting the coil device to an outer circuit.
  • the inside of the coil winding faces a center of the coil winding, and the outside of the coil winding is remote from the center of the coil winding.
  • the first and second contacts with the inner and outer contacts serve to connect the coil means to an external circuit.
  • these contacts are executed as low as possible, and the contacts suitably comprise conductive materials as possible with a high geometric cross-section for power transport.
  • the inner and outer contacts may comprise copper.
  • the advantage of this embodiment is that in this way the contacts to the two contact pieces can be created on freely accessible sides of the coil winding.
  • no temporary filler pieces have to be inserted into the winding during the production of the coil winding, which subsequently have to be removed again, to make room for a to be introduced in a gap of the winding contact piece.
  • the high space requirement for such a placeholder is eliminated as well as the space required for a contact within the winding. This results in a higher effective current density within the winding.
  • Another advantage of the freely accessible contact points to create the contacts to the contact pieces is that under less confined spaces easier enough a low-resistance and reliable solder joint between the contact piece and contact side of the strip conductor can be created.
  • a further power supply from an external circuit to the contact pieces is simplified because the contact pieces can be easily connected to an external power connection even on the freely accessible sides of the coil winding.
  • the strip conductor may have two conductor surfaces, and the coil device may comprise at least two patches which are respectively adjacent to one of the conductor surfaces of the strip conductor in the torsion region of the at least one twisted turn such that the patches largely fill spaces due to the torsion between adjacent turns.
  • the advantage of this embodiment is that the mechanical stability of the resulting coil winding is increased because the band conductor is held firmly by the at least two filler pieces. The mechanical stability is increased on the one hand during winding of the coil, so that during production, a larger winding tension can be used without the band conductor in the region of the torsion zone to harm. On the other hand, the mechanical stability during operation of the superconducting coil is also improved by the filler pieces.
  • Superconducting coils can be exposed during their operation strong centrifugal forces, for example by rotation in generators or machines. Alternatively or additionally, they may also be exposed to high Lorentz forces when generating strong magnetic fields. To protect against damage to the strip conductor under such loads, it is expedient to hold the strip conductor on both sides even in the torsion region of the winding and to protect against unnecessary tensile or shear forces and vibrations. The use of two separate patches is therefore expedient because the twisted band conductor itself divides the cavity formed by the torsion in the coil winding into two approximately equal and non-contiguous parts.
  • Each of the two aforementioned filling pieces may comprise an inner and an outer portion, wherein the respective inner portion is arranged on a locally centered side of the twisted band conductor and the respective outer portion is arranged on a side facing away from the center of the twisted band conductor locally.
  • Such a division of the filler into at least two sections is advantageous because the two conductor surfaces of the strip conductor change by the torsion each from the inside to the outside or vice versa. Since it is difficult to position an elongated filler simultaneously above and below the turn of a ribbon conductor in the manufacture of the coil, the division of each filler into at least two segments facilitates insertion into the coil to be produced.
  • the torsion range of the winding can be at least three times as large along the longitudinal direction of the strip conductor as the width of the strip conductor. Particularly advantageously, the torsion range in this direction at least five times and at most ten times as large as the width of the strip conductor.
  • the torsion of the strip conductor is narrower, and the individual layers of the strip conductor are subjected to greater mechanical stress by the torsion.
  • the advantage of a rather small aspect ratio lies in the fact that the compactness and possibly existing symmetry of the entire coil device is disturbed only in a small partial area. It is therefore advantageous to choose the torsion zone as small as it is possible in the mechanical strength of the strip conductor used.
  • the aspect ratio of the dimensions of the filler in the longitudinal direction of the strip conductor and in the direction of the conductor width is then about the same or almost as large as the abovementioned aspect ratio of the torsion region itself.
  • the coil winding may comprise at least five turns, and the at least one twisted winding may be in the region of the 20% of the turns facing away from the center.
  • the number of turns is advantageously much higher, for example in the range of 10 to 1000 turns.
  • the torsion region of the twisted turn may be approximately diametrically opposite the region of the first contact. This is advantageous to those passing through the first contact and the torsion zone Evenly distributed asymmetry of the coil winding to distribute evenly over the winding.
  • the coil winding may be formed as a flat rectangular coil with four straight sections and four rounded corners.
  • a rectangular coil or racetrack coil called coil form is often used in the field of rotors of generators or synchronous machines.
  • other coil shapes are possible, such as oval or cylindrical flat coils or saddle-shaped coils.
  • the torsion region can be arranged centrally on one of the straight sections of the rectangular coil.
  • This arrangement has the advantage that the band conductor in the torsion region is then twisted only along the longitudinal axis and at this point is not simultaneously bent within the winding plane. If there is a torsion at the same point and at the same time bending around another axis, the band conductor is subjected to more stress than a simple torsion on a straight section of the winding.
  • An advantage of the uniform distribution of the torsional stress is an arrangement of the torsion region in the middle of one of the straight sections of the rectangular coil.
  • the torsion region is particularly advantageously arranged on or near the intended axis of rotation of the coil.
  • Such an embodiment has the advantage that only slight centrifugal forces occur in the region of the torsion zone due to the positioning on or near the axis of rotation, and thus that the mechanically somewhat more vulnerable twisted region of the strip conductor is protected against additional mechanical loads.
  • the turns of the coil winding may be mechanically fixed with a potting compound and / or an adhesive.
  • the resulting benefits are analogous to the advantages of using patches to fill in the cavities created by the torsion.
  • the coil winding is damaged by mechanical force protected.
  • Particularly advantageous is the use of filler pieces in combination with a casting of the coil winding, wherein the inserted filler is cast together with the adjacent strip conductor turns.
  • a first contact between the contact side of the strip conductor and an inner contact piece can be formed only after the winding of the strip conductor, and a second contact between the contact side of the strip conductor and an outer contact piece can be formed.
  • This embodiment is advantageous if the coil is to be released from the winding carrier before being put into operation and is either used as a freely supporting component without a carrier or is transferred to a separate coil carrier for operation.
  • At least two filler pieces can be arranged adjacent to one of two conductor surfaces of the strip conductor in such a way that they cause interspaces due to the torsion between adjacent turns fill.
  • Each of the two filler pieces may comprise an inner and an outer portion, wherein the respective inner portion is disposed on a locally centered side of the twisted strip conductor and the respective outer portion is arranged on a side facing away from the center of the twisted band conductor locally.
  • the coil winding can be glued after winding and / or during winding with a potting compound and / or with an adhesive.
  • the advantages of these embodiments are analogous to the advantages of claim 9.
  • Fig. 1 shows a cross section of a superconducting strip conductor 1, in which the layer structure is shown schematically.
  • the strip conductor in this example comprises a substrate strip 2, here is a 100 micron thick substrate strip of a nickel-tungsten alloy. Alternatively, steel bands or bands of an alloy such as Hastelloy can be used.
  • a 0.5 ⁇ m thick buffer layer 4 is arranged, which here contains the oxidic materials CeO 2 and Y 2 O 3 .
  • the actual superconducting layer 6, here a 1 ⁇ m thick layer of YBa 2 Cu 3 O x which in turn is covered with a 50 ⁇ m thick contact layer 8 made of copper.
  • the superconducting layer and the copper may additionally be a silver topcoat.
  • YBa 2 Cu 3 O x As an alternative to the material YBa 2 Cu 3 O x , it is also possible to use the corresponding compounds REBa 2 Cu 3 O "of other rare earths RE
  • another 50 ⁇ m thick cover layer 10 made of copper is arranged here, followed by one Insulator 12, which in this example is formed as a Kapton tape 25 microns thick, but the insulator 12 can also be made of other insulating materials such as other plastics.
  • the width of the insulator 12 is slightly larger than the width of the remaining layers
  • a contacting of the strip conductor 1 is advantageously possible via the contact layer 8.
  • the overhead side of the strip conductor 1 is therefore also referred to as the contact side 13.
  • a preferred contact side 13 is given, which is typically the side of the substrate 2, on which the superconducting layer 6 is arranged.
  • FIG. 3 shows a schematic cross-section of a rectangular coil winding 15 according to the preferred embodiment of the invention. Shown is an early stage during the manufacture of the coil winding 15, in which the strip conductor 1 is wound from a supply reel 19 onto a winding support 17. In this case, both the supply reel 19 and the winding support 17 within the winding plane, which here is the cutting plane, with the in Fig. 1 marked directions of rotation turned 18 and 20.
  • a first contact 23 was formed between the contact side 13 of the strip conductor and a first contact piece (not shown here for the sake of clarity).
  • the first contact piece for example, consists essentially of copper and may be fixedly connected to the winding support 17 and / or integrated into it.
  • the winding support 17 is in this example a cylindrical body with a rectangular cross section with rounded corners.
  • the strip conductor 1 is then wound flat with the inner contact side 13 on the winding support 17.
  • some turns can be formed with an initially internal contact side 13.
  • Fig. 2 is shown schematically only half a turn with internal contact side 13, but this is only to be understood as an example.
  • Coil windings 15 are advantageously produced with a plurality of turns, in which the contact side 13 lies on an inner side 29 of the coil winding 15. Then within a turn W t , which in Fig.
  • the tape conductor 1 twisted about its local longitudinal axis 24 by about 180 degrees, so that after the torsion, the contact side 13 of the strip conductor 1 on a Outside 31 of the coil winding 15 comes to rest.
  • the torsion portion 25 is arranged in this embodiment so that it comes to lie completely on one of the straight portions of the rectangular coil.
  • the length 26 of the torsion zone 25 is in this example at a five times the width 30 of the strip conductor 1, so that the rotation of the strip conductor 1 does not lead to excessive mechanical stress of the layer system, the torsion region 25, however, is not extended larger than necessary.
  • the axis of rotation 28 is also marked, around which the finished coil winding 15 will rotate in a later application, for example in the rotor of a synchronous machine.
  • the torsion region 25 is arranged in this example symmetrically about this axis of rotation 28, so that a load on this sensitive area is largely minimized by centrifugal forces.
  • two filler pieces each having two sections 33 are introduced into the resulting cavities, which mechanically support the twisted strip conductor.
  • the total of four sections 33 are shaped to fill the spaces between the twisted turn W t and adjacent turns.
  • the four sections 33 may fill an approximately equal volume and be configured such that each filler comprises a lower and an upper section. Of these, a respective bottom and an overhead section 33 of the contact side 13 of the twisted winding W t is adjacent, the other two sections 33 are arranged adjacent to the back of the twisted strip conductor 1 adjacent.
  • Fig. 3 shows a schematic detail view of the torsion 25 of the coil winding 15.
  • the upper area of the Fig. 3 is the inner side 29 of the coil winding 15 faces, and the lower portion of the outer side 31 of the coil winding 15 faces.
  • the contact side 13 of the strip conductor 1 faces the center 27 of the coil.
  • the contact side 13 of the strip conductor is remote from the center 27 of the coil.
  • the strip conductor 1 On a portion of the length 26 of the winding W t , the strip conductor 1 is twisted about its longitudinal axis 24 by about 180 degrees. As a result, the thickness of this turn W t locally increases to a value corresponding to the width 30 of the strip conductor.
  • the above and below the twisted strip conductor 1 inserted patches are sake of clarity in Fig. 3 not shown, since they would otherwise obscure the conductor surface 36 of the twisted strip conductor 1.
  • the illustrated conductor surface 36 may be, for example, the contact side 13.
  • Fig. 4 shows a schematic perspective view of one of the four sections 33 of the filler.
  • the length of this section corresponds approximately to half the torsion length 26a.
  • the illustrated section 33 includes five boundary surfaces 33a to 33e, two of which are curved surfaces 33b, 33c and three planar surfaces 33a, 33d, 33e. In this example, it is a bottom section 33 which is inserted between the twisted turn W t and the next inward turn W t-1 .
  • the second associated section which is adjacent to the same conductor surface 36 of the twisted strip conductor 1, is accordingly an overhead section which is inserted between the twisted turn W t and the torsion adjacent outboard turn W t + 1 .
  • the straight boundary surface 33a connects these two associated sections.
  • the twisted limiting surface 33b is adjacent in the ready-wound coil conductors of the twisted surface 36 of the turn W t.
  • the also curved Interface 33c is applied to the band conductor 1 of the subsequent turn W t + 1 , which is formed slightly curved by the higher space requirement in the torsion 25.
  • the lower surface 33d is formed straight and adjacent to the next inner winding W t-1 .
  • the interface 33e is also straight and limits the section laterally, in a direction perpendicular to the winding plane.
  • the filler pieces are made in the preferred embodiment of glass fiber reinforced plastic. However, they may alternatively or additionally include other materials. Particularly suitable are those materials whose thermal shrinkage is similar to the thermal shrinkage of the remaining coil winding 15 when the coil winding 15 cools from room temperature to an operating temperature of 77 K or 25-30 K, for example.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)
EP14729237.9A 2013-05-28 2014-05-20 Supraleitende spuleneinrichtung mit spulenwicklung und herstellungsverfahren Active EP2987173B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013209967.3A DE102013209967A1 (de) 2013-05-28 2013-05-28 Supraleitende Spuleneinrichtung mit Spulenwicklung und Herstellungsverfahren
PCT/EP2014/060284 WO2014191252A1 (de) 2013-05-28 2014-05-20 Supraleitende spuleneinrichtung mit spulenwicklung und herstellungsverfahren

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EP2987173A1 EP2987173A1 (de) 2016-02-24
EP2987173B1 true EP2987173B1 (de) 2018-12-26

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US (1) US10032549B2 (ja)
EP (1) EP2987173B1 (ja)
JP (1) JP6320518B2 (ja)
KR (1) KR101786024B1 (ja)
CN (1) CN105283933B (ja)
AU (1) AU2014273339A1 (ja)
DE (1) DE102013209967A1 (ja)
WO (1) WO2014191252A1 (ja)

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DE102014211316A1 (de) * 2014-06-13 2015-12-17 Siemens Aktiengesellschaft Elektrische Spuleneinrichtung mit wenigstens zwei Teilspulen und Herstellungsverfahren dazu
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AU2014273339A1 (en) 2015-11-19
US20160118172A1 (en) 2016-04-28
DE102013209967A1 (de) 2014-12-18
JP2016524815A (ja) 2016-08-18
CN105283933A (zh) 2016-01-27
CN105283933B (zh) 2018-04-27
KR101786024B1 (ko) 2017-10-18
JP6320518B2 (ja) 2018-05-09
WO2014191252A1 (de) 2014-12-04
EP2987173A1 (de) 2016-02-24
US10032549B2 (en) 2018-07-24
KR20160013168A (ko) 2016-02-03

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