Classifications

• • H—ELECTRICITY
  • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
  • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
  • H10N60/00—Superconducting devices
  • H10N60/20—Permanent superconducting devices
  • H10N60/203—Permanent superconducting devices comprising high-Tc ceramic materials
• • H—ELECTRICITY
  • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
  • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
  • H10N60/00—Superconducting devices
  • H10N60/20—Permanent superconducting devices
• • H—ELECTRICITY
  • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
  • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
  • H10N60/00—Superconducting devices
  • H10N60/01—Manufacture or treatment
• • H—ELECTRICITY
  • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
  • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
  • H10N60/00—Superconducting devices
  • H10N60/80—Constructional details
  • H10N60/85—Superconducting active materials
  • H10N60/855—Ceramic superconductors
  • H10N60/857—Ceramic superconductors comprising copper oxide

Definitions

• the invention relates to a superconducting device for operation in an external alternating magnetic field, comprising two superconducting contact elements and a connecting them in one of the current flow direction of a contact element to the other contact element corresponding longitudinal direction
• alternating magnetic fields alternating magnetic fields
• superconductors have also been proposed in alternating magnetic fields (alternating magnetic fields), for example in superconducting electrical machines.
• alternating field losses occur, which can be divided into various components ent ⁇ speaking the physical causes.
• superconductors there are over normal conductors additional effects / components, another problem is that these alternating field losses can be for use particularly troublesome under duty characteristics ⁇ gen in the cold and prohibitive, as a multiple of the alternating field losses is then required at room temperature, which the Reduced efficiency.
• superconductors which are usually made of billets or bolts, for example NbTi, Nb3Sn, MgB2 or Bi 2223, the use of superconducting filaments is known. Filaments in superconductors not only have a posi ⁇ tive increase the stability of superconductivity result, but also the alternating field losses can be reduced.
• the invention is therefore based on the object to provide a possible ⁇ ness to reduce the coupling losses at in individual filaments to be divided superconductor layers.
• a superconductor device of the type ge ⁇ called is characterized in that two adjacent ones of the filaments are conductively connected in a fabric ⁇ th on the substrate the crossing area, are conductively connected to the four current paths by omitting the recess at least, with respect to itself the crossing opposite, offset in the longitudinal direction and a direction perpendicular to the longitudinal direction transverse direction of the layer plane, at the intersection meeting current paths of the adjacent filaments at least one, in particular in each case one ohmic resistance barrier is provided. In this case, the use of a respective resistance barrier is preferred.
• the provision of the crossing regions and the resistance barriers results in the generation of two current paths crossing in the crossing region, along which the electric fields (and thus also the induced voltages) cancel each other out in a symmetrical configuration, ie four geometrically at least similar current paths.
• the effect is in this case at least in the range up to the critical current of a filament is the same, which also would result if an isolated by the at ⁇ whose current path bridge to the other filament would see pre ⁇ .
• the present invention allows a two-dimensional realization, lying in the layer plane, of a "rotation" of current paths against one another. Accordingly, the effect also arises in the present invention, at least in part, of viewing along a current path at least for the most part, with corresponding symmetry, cancel out the electric fields.
• a layered superconductor according to the invention does not simply have straight-line filaments / striations which completely define the current paths, but rather countries, the current paths intersect each other in the layer plane in a defined way such that the induced electrical ⁇ rule fields along the current paths cancel each other at least partially.
• the resistance barriers which are local regions of defined resistance, thus lead to the decoupling of the current paths.
• junction in particular an odd number of crossing areas are connected. With a very high number of crossing regions over the length of the conductor, however, the even or odd number of crossing regions is negligible.
• Has a current-carrying section therefore, in ⁇ way of example six filaments, to form three groups of adjacent filaments, each having at least an intersection area, and consequently two in the eins- form at least one junction intersecting current paths.
• An odd number of crossing areas means that an even number of conductor loops is formed, so that alternately the by Kir- netfeld induced electric field encounters the current in opposite ⁇ translated directions, so that it in a symmetrical configuration, ideally, to a lifting of the effects comes.
• the resistance barriers at several intersection areas are to be arranged in such a way that there is always a current path which does not lead across any of the resistance barriers. Overall, in this embodiment, only care must be taken that always between the two filaments of a
• the electrical connection is made and preferably the corresponding offset resistance barriers are provided.
• the resistance values of the at least one resistance barrier are respectively selected so that an ohmic power loss is smaller in absolute value than a Redu ⁇ cation of the power loss due to coupling be ⁇ nachbarter filaments.
• the resistance values may, for example, be in a range of less than 0.5 ⁇ , in particular less than 0.1 ⁇ sondere ⁇ . With externally produced contacts on high-temperature superconductors easy to get into the range of about 6 ⁇ , so that the said low ⁇ ren values for the individual resistance barrier appear slightly he ⁇ reichbar.
• Resistance values for the individual resistance barriers can also be roughly estimated by making a comparison with a conventional striated conductor with non-intersecting filaments, for example, assuming six filaments of 0.1 m in length, a substrate width of 0.012 m , ei ⁇ ner filament separation (width of the recess) of 10 ym and a thickness of the superconducting layer on the substrate of 3 ym, it follows from the law of induction and, assuming a total current of 120 A, finally a power dissipation density of 10 7 W / m 3 .
• the at least one lovedsbarrie ⁇ re by laser treatment and / or mechanical treatment of the layer and / or a localized Dotie ⁇ tion / depletion of the layer and / or by using a local coating and / or weakening the superconducting structure in Substrate be realized.
• the Supraleittechnologie basically be ⁇ knew ways to generate targeted and locally resistance barriers low resistance in filaments.
• a use of a laser once it is known for example to produce the Aussparun ⁇ gen between the individual filaments as well by a laser and the barrier as well as a (less intensive) use of the laser in the resistance for the barrier provided spatial resistance range on the remaining filament can be made.
• the at least one resistance barrier is arranged directly adjacent to the respective crossing region, since then a particularly clear definition of the current paths is made possible.
• the invention can be realized in a particularly simple manner by virtue of the fact that a recess or furrow is not continuously formed over the entire length of the current-carrying section by the superconductor layer which separates the filaments, but has interruptions at the intended crossing regions, so that the crossing areas entspre ⁇ accordingly arise.
• a corresponding lateral constriction of the intersection region the ⁇ still will be intended and contemplated. ⁇ is deviated as little as possible Draw from the straight course of the individual filaments, this results in the most compact realization of the present invention.
• Fig. 3 shows a second embodiment of a erfindungsge ⁇ MAESSEN superconducting device, and Fig. 4 a plurality of crossing areas in a filament group.
• Fig. 1 shows an extremely simple, for illustration geeigne ⁇ tes embodiment of a superconducting device according to the invention la, in which two filaments 3 connecting two contact elements 2 are provided, which are separated by Ausspa ⁇ ments 4.
• the plane of the drawing of FIG. 1 is the layer plane of the superconductor layer.
• the Strom Resultssab ⁇ section 5 is as known between the contact elements. 2
• the filaments are not separated 3 over the entire current-carrying section 5, but centrally in a Kreu ⁇ -cutting section 6 and a total of a symmetrical design ⁇ from forming an electrically conductive manner.
• This sym- metry is broken, however, immediacy ⁇ adjacent bar through the crossing portion 6 at opposite with respect to the intersection region 6, transversely and longitudinally offset, locally provided in resistance areas resistance barriers. 7
• the resistance barriers 7 have an extremely low ohmic resistance value, in this case in the range of less than 0.1 ⁇ , and were produced by laser treatment, although other possibilities for generation are also conceivable.
• YBCO is used herein.
• An external alternating magnetic field runs perpendicular to the layer plane according to the arrows 9 and can thus induce an electric field indicated by the arrows 10, that is to say due to the change over time.
• the provision of the resistance barriers 7 now accelerated initially the use of a first, ge ⁇ marked by solid arrows 11 the current path, which consequently changes in the crossing area 6 from the left filament 3 to the right filament 3, wherein in the present case illustrates a situation in which the transport stream from bottom to top in Fig. 1 runs.
• the second current path which leads across the resistance barriers 7 and is identified by dashed arrows 12, is also used.
• the first and the second current paths thus intersect in the crossing region 6, so that overlapping current paths in the layer plane of the superconductor layer can be created by the resistance barriers 7 and the crossing region 6.
• the curve 13 corresponds to the total current, whose maximum in magnitude ideally corresponds to substantially twice the critical current of a filament 3.
• the curve ⁇ ve 14 shows the course of the partial flow for the first current path (arrows 11 in Fig. 1), the curve 15 the course for the second current path (arrows 12 in Fig. 1). Until the critical current I c in the first current path is reached, only current flows in the first current path, after which the second current path takes over the excess current; in the case of the falling total current edge, the opposite occurs accordingly.
• the second current path fulfills the task of compensating for the induced electric field, so that at least partially the vorteilhaf ⁇ te reduction of coupling losses occurring.
• the current paths or filaments need not necessarily diverge as pronounced pronounced, as shown in the illustrative first embodiment of FIG. Si It only needs to be ensured that the resistance barriers 7 force the illustrated current flow.
• FIG. 3 shows a second exemplary embodiment of a superconducting device 1b according to the invention, wherein for the sake of simplicity the reference symbols of FIG. 1 have been retained for corresponding components.
• six filaments 4 are vorgese ⁇ hen here, which are divided into three groups of filaments 16 of each two neighboring filaments 3.
• Filament groups 16, the recess 4 is continuous, while within the filament groups 16, the recess 4 is interrupted to form the crossing regions 6, wherein a possible course of the resistance barriers 7 is interpreted accordingly. Accordingly, the current flow is also ge ⁇ according to the first current path, see. here the arrow 17, and in the second current path, cf. here the arrow 18, again dashed, forced.
• the crossing regions 6 are each located in the middle of the current-carrying section 5, so that in each case opposite electric fields occur along the current paths at equal lengths.
• the number of crossing regions 6 does not necessarily have to be limited to one, as shown schematically by the filament pair 16 of FIG. 4. There, three crossing regions 6 are realized, which are equidistant over the length of the

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• Superconductors And Manufacturing Methods Therefor (AREA)
• Superconductor Devices And Manufacturing Methods Thereof (AREA)

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• 2016
  • 2016-03-24 DE DE102016204991.7A patent/DE102016204991A1/de not_active Withdrawn
• 2017
  • 2017-03-22 RU RU2018133602A patent/RU2697426C1/ru not_active IP Right Cessation
  • 2017-03-22 KR KR1020187030623A patent/KR102147325B1/ko active IP Right Grant
  • 2017-03-22 EP EP17715063.8A patent/EP3433882A1/de not_active Withdrawn
  • 2017-03-22 US US16/086,893 patent/US20190103543A1/en not_active Abandoned
  • 2017-03-22 JP JP2018549329A patent/JP6735842B2/ja not_active Expired - Fee Related
  • 2017-03-22 WO PCT/EP2017/056770 patent/WO2017162714A1/de active Application Filing
  • 2017-03-22 CN CN201780019708.3A patent/CN108886087A/zh active Pending

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