JP2011222346A - High-temperature superconductor and high-temperature superconducting coil using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high-temperature superconductor featuring an increased freedom of coil design capable of dislocation inside of coil using narrow high-temperature superconducting wire and a high-temperature superconducting coil formed by winding the foregoing around the core.SOLUTION: Tape-like high-temperature superconducting wires 2 comprising a metal substrate layer 4, an electrical insulator interlayer 5, and an oxide superconductive layer 6, those which being laminated in that order, are arranged in parallel to the wide-surface direction with a minute clearance provided in between, and a plurality of the parallelized high-temperature superconducting wires 2 are concatenated in the lengthwise direction at predetermined intervals at connecting sections 10. The parallelized high-temperature superconducting wires 2 have the order in which each layer thereof are laminated is reversed between the two high-temperature superconducting wires 2 and between the corresponding high-temperature superconducting wires 2 adjacent in the lengthwise direction at connecting sections 10. The four high-temperature superconducting wires 2 are electrically connected with each other at connecting sections 10 by two sheets of connecting-use high-temperature superconducting wires 3, the end portions thereof being fixed to the upper and lower surfaces of the high-temperature superconducting wires 2.

Description

  Embodiments described herein relate generally to a high-temperature superconducting conductor and a high-temperature superconducting coil formed by providing an oxide superconducting layer.

  Metal substrate formed of a rare earth element-based oxide superconducting layer, such as Y (yttrium) or Gd (gadolinium), which has excellent critical current characteristics in a high temperature and high magnetic field, formed of Hastelloy (registered trademark) or the like High-temperature superconducting wires called second generation wires formed on an intermediate layer such as cerium oxide laminated thereon have been manufactured. Accordingly, using this high-temperature superconducting wire, for example, a superconducting coil built into superconducting application equipment such as a magnetic resonance diagnostic imaging apparatus (MRI), a superconducting energy storage apparatus (SMES), and a semiconductor manufacturing apparatus is being advanced. It has been.

And when manufacturing a superconducting coil, in order to design so that an energization current value may be increased, it is possible that the high temperature superconducting wire is a wide one manufactured using a wide metal substrate. However, as shown in FIG. 20, in the case where the high temperature superconducting wire 100 is wide, when the variable magnetic field (dB / dt) indicated by the hatched arrow is received due to excitation demagnetization or the like, the variable magnetic field (dB / dt) is changed. As shielded, a magnetizing current (I _M ) is generated in the high-temperature superconducting wire 100 in addition to the transport current (I _T ), and there is a problem of reduction in current carrying capacity due to drift current and generation of AC loss. The width of the high temperature superconducting wire 100 increases as the width increases.

  In order to solve such a problem, a method of superposing a plurality of high-temperature superconducting wires having a narrow width when winding is used. However, when superposed high-temperature superconducting wires are superposed, it is necessary to change the relative position of the superposed high-temperature superconducting wires, that is, dislocation, in order not to generate a drift due to a difference in empirical magnetic fields. . However, it is difficult to change the relative position of the tape-shaped high-temperature superconducting wire inside the coil.

  Therefore, it is known that the superconducting coil has a structure in which a plurality of unit coils are laminated and connected, and the dislocation is performed by changing the relative positional relationship of the high-temperature superconducting wire at the connecting portion.

  For example, the number of turns of the superconducting layer located on the inner circumference side at one end of the superconducting conductor in at least one unit of a double pancake type superconducting coil is larger than the number of turns on the outer circumference side, and the mutual position of both superconducting layers is shifted at the other end. Configure to Alternatively, a high-temperature superconducting coil in which a plurality of coil units each having a plurality of high-temperature superconducting tape materials wound thereon are stacked, and the connection of the high-temperature superconducting tape material between each coil unit is at least two sets of tape materials. A high-temperature superconducting tape material wound nth from the inside of the unit and a high-temperature superconducting tape material mth (n ≠ m) from the inside of the other coil unit are connected to form a high-temperature superconducting tape material. The sum of the magnetic fluxes penetrating the loop is configured to be substantially zero. Alternatively, the superconducting coil is formed in a double pancake shape by a first coil and a second coil wound by bundling two superconducting tape wires, and is located in the innermost layer of the first coil and the second coil. For example, only two superconducting tape wires are replaced at any one location in the circumferential direction.

Japanese Patent Laid-Open No. 10-308306 JP 2002-184618 A JP 2009-246118 A

  However, when a plurality of unit coils are stacked and the high-temperature superconducting wire is transferred at the connection, the number of unit coils having the same empirical magnetic field and the number of superposed high-temperature superconducting wires are the same. This is a severe constraint in designing. For example, in a cylindrical superconducting coil, if a high-temperature superconducting wire is to be displaced only at the connecting portion of the unit coil, the unit coil must be stacked two by two due to the symmetry of the magnetic field distribution, and the high temperature to be superposed The number of superconducting wires needed to be two. For this reason, in such a conventional method, there is a problem that the coil shape and dimensions cannot be freely designed when trying to narrow the width of the high-temperature superconducting wire in order to reduce the current carrying capacity and suppress the occurrence of AC loss.

  The present invention has been made in view of such circumstances, and the purpose of the present invention is to achieve dislocation within the coil in order to ensure the degree of freedom in design of the coil shape and dimensions even when a high-temperature superconducting wire having a narrow width is used. An object of the present invention is to provide a high-temperature superconducting conductor that can be used, and a high-temperature superconducting coil formed by winding the high-temperature superconducting conductor.

  In the embodiment of the high-temperature superconducting conductor, a tape-shaped high-temperature superconducting wire having a predetermined length formed by sequentially laminating a metal substrate layer, an intermediate layer of an electrical insulator and an oxide superconducting layer is provided with a minute gap therebetween. A high-temperature superconducting conductor in which a plurality of the high-temperature superconducting wires arranged in parallel and arranged in parallel so that the wide surfaces form the same surface and connected in parallel at a predetermined interval in the longitudinal direction is the parallelized In the high-temperature superconducting wire, the stacking order of the layers in at least one of the high-temperature superconducting wires out of parallel is opposite to the stacking order of the layers in the other high-temperature superconducting wires, and the connecting portion is connected in parallel The two high-temperature superconducting wires for connection are fixed to the upper and lower surfaces of each end portion adjacent to each other in the connecting direction of the high-temperature superconducting wires so as to be electrically connected to each other.

  In the embodiment of the high-temperature superconducting coil, the high-temperature superconducting conductor is wound and coil-molded, and then impregnated with a thermosetting synthetic resin to form a winding portion.

  According to the present invention, when designing a coil, a sufficient degree of freedom in design of the coil shape and dimensions can be ensured, the design becomes easy, and the winding work during coil manufacture can be easily performed. A superconducting conductor can be obtained. Furthermore, when a fluctuating magnetic field (dB / dt) is generated, it is possible to obtain a high-temperature superconducting coil with reduced current carrying capacity and less AC loss.

It is a perspective view which shows the high-temperature superconducting conductor in 1st Embodiment. 2A is a cross-sectional view of the high-temperature superconducting conductor shown in FIG. 1, FIG. 2A is a cross-sectional view in the direction of the arrow in the cross-section U, and FIG. (A) And (b) is a perspective view which shows the path | route of the transport current ( _IT ) in the high temperature superconducting conductor shown in FIG. 1, respectively. It is a perspective view which shows the state of the induction electric field (E) when the fluctuation magnetic field (dB / dt) in the high temperature superconducting conductor shown in FIG. 1 is applied. It is a perspective view which shows the high temperature superconducting coil in 1st Embodiment. It is a fragmentary sectional view of the A section in the high temperature superconducting coil shown in FIG. It is a fragmentary perspective view which shows the 1st modification of the high temperature superconducting conductor in 1st Embodiment. It is a fragmentary perspective view which shows the 2nd modification of the high temperature superconducting conductor in 1st Embodiment. It is a fragmentary perspective view which shows the 3rd modification of the high temperature superconducting conductor in 1st Embodiment. It is a fragmentary perspective view which shows the 4th modification of the high temperature superconducting conductor in 1st Embodiment. It is a fragmentary perspective view which shows the 5th modification of the high temperature superconducting conductor in 1st Embodiment. It is a fragmentary perspective view which shows the 6th modification of the high temperature superconducting conductor in 1st Embodiment. FIG. 13A is a perspective view of a high-temperature superconducting conductor showing a first modification of the high-temperature superconducting coil in the first embodiment, and FIG. 13A is a diagram for explaining a magnetic field (B) and a magnetic flux (φ) in the high-temperature superconducting conductor. FIG. 13B is a diagram showing an induced electric field (E) in the high-temperature superconducting conductor. It is a fragmentary sectional view of the A section in the 2nd modification of the high temperature superconducting coil in a 1st embodiment. It is a perspective view which shows the principal part of the high temperature superconducting conductor in 2nd Embodiment. 15A is a cross-sectional view of the main part of the high-temperature superconducting conductor shown in FIG. 15, FIG. 16A is a cross-sectional view in the direction of the arrow in the cross-section W, and FIG. . It is a perspective view which shows the high-temperature superconducting conductor in 2nd Embodiment. 17A is a cross-sectional view of the high-temperature superconducting conductor shown in FIG. 17, FIG. 18A is a cross-sectional view in the direction of arrow in cross-section Y, and FIG. (A) And (b) is a perspective view which shows the path | route of the transport current ( _IT ) in the high temperature superconducting conductor shown in FIG. 17, respectively. It is a perspective view of the high temperature superconducting wire for demonstrating the prior art.

(First embodiment)
A first embodiment will be described with reference to FIGS. Further, the first modified embodiment of the high-temperature superconducting conductor in the present embodiment is shown in FIG. 7, the second modified embodiment is shown in FIG. 8, the third modified embodiment is shown in FIG. 9, and the fourth modified embodiment is shown in FIG. The fifth modification will be described with reference to FIG. 11, and the sixth modification will be described with reference to FIG. Further, a first modification of the high-temperature superconducting coil in the present embodiment will be described with reference to FIG. 13, and a second modification will be described with reference to FIG.

  First, as shown in FIGS. 1 to 4, the high-temperature superconducting conductor 1 connects two pairs of tape-like high-temperature superconducting wires 2 and a plurality of pairs of high-temperature superconducting wires 2 in the longitudinal direction. The wide flat surface (tape surface) is formed of a rectangular flat plate connecting high temperature superconducting wire 3 having a width approximately twice that of the high temperature superconducting wire 2. As shown in FIG. 2, the high-temperature superconducting wire 2 and the connecting high-temperature superconducting wire 3 include an intermediate layer 5, an oxide superconducting layer 6, and a protective layer 7 formed on the tape-like metal substrate layer 4 at equal widths. It has a multilayer structure in which are stacked in order.

  The metal substrate layer 4 is formed of, for example, a nickel-based alloy Hastelloy (registered trademark), stainless steel, or the like. The intermediate layer 5 laminated on the metal substrate layer 4 is, for example, cerium oxide or It has a single-layer or multi-layer structure of an electrical insulator such as magnesium oxide. In addition, the oxide superconducting layer 6 laminated on the intermediate layer 5 has a thickness of, for example, several μm, such as a Re123 system containing a rare earth (Re) element such as Y (yttrium) or Gd (gadolinium). It is a very thin oxide layer.

  Furthermore, the protective layer 7 laminated on the oxide superconducting layer 6 is made of, for example, Au (gold) or Ag (silver). And all the layers from the laminated metal substrate layer 4 to the protective layer 7 are covered with a stabilizing layer 8 made of, for example, Cu (copper) or the like. The stabilizing layer 8 may be coated by soldering a metal tape, or may not cover all the layers having a multilayer structure and cover only one wide surface.

  The two tape-shaped high-temperature superconducting wires 2 forming a pair constituting the high-temperature superconducting conductor 1 are provided with a minute gap between them so that the wide surfaces thereof are the front and back surfaces (upper and lower surfaces). The two high-temperature superconducting wires 2 that are arranged in parallel are arranged in parallel, and the stacking order of the layers is reversed upside down. For example, one of the high-temperature superconducting wires 2 is the metal substrate layer 4. Is located on the upper side, and the metal substrate layer 4 is located on the lower side of the other high-temperature superconducting wire 2. Furthermore, in the two pairs of tape-like high temperature superconducting wires 2 that are the next pair that are connected in the longitudinal direction with a predetermined interval to the two high temperature superconducting wires 2 that are the front pair when connected, One high-temperature superconducting wire 2 has the metal substrate layer 4 on the lower side, and the other high-temperature superconducting wire 2 has the metal substrate layer 4 on the upper side. The stacking order of the layers is also reversed between the corresponding high-temperature superconducting wires 2 in the rear pair.

  The connecting high-temperature superconducting wires 3 for connecting the two pairs of high-temperature superconducting wires 2 in the longitudinal direction are the upper and lower surfaces of the ends of the four adjacent high-temperature superconducting wires 2 in the front and rear pairs. Are connected to each other so as to be electrically connected to each other by a solder 9, and a connecting portion 10 in which four high-temperature superconducting wires 2 are sandwiched by two connecting high-temperature superconducting wires 3 is formed. These four high-temperature superconducting wires 2 are connected. The stacking order of the layers of the connecting high-temperature superconducting wire 3 fixed to the lower surfaces of the two pairs of high-temperature superconducting wires 2 is as shown in FIG. Further, the same as the stacking order of the one pair of high-temperature superconducting wires 2 of the front pair, the metal substrate layer 4 is located on the lower side, and the connecting high-temperature superconducting wire 3 fixed to the upper surface It is the same as the stacking order of the high-temperature superconducting wires 2, and the metal substrate layer 4 is located on the upper side.

  Note that the stacking order of each layer of the high-temperature superconducting wire 3 for connection is as shown in FIG. 2 (b) with respect to the two pairs of high-temperature superconducting wires 2 shown in FIG. Contrary to the case of the previous pair, the connecting high-temperature superconducting wire 3 fixed to the lower surface and the other high-temperature superconducting wire 2 are stacked in the same order, and the connecting high-temperature superconducting wire 3 fixed to the upper surface and one of the high-temperature superconducting wires 2 The stacking order of the superconducting wires 2 is the same.

  In the high-temperature superconducting conductor 1 configured as described above, since the intermediate layer 5 is formed of an electrical insulator, the current flowing through the oxide superconducting layer 6 is unlikely to flow out in a direction penetrating the intermediate layer 5. Yes. Therefore, in the connection part 10 where the upper and lower connecting high-temperature superconducting wires 3 are fixed and the two pairs of high-temperature superconducting wires 2 are connected, the current flowing in the oxide superconducting layer 6 flows as follows.

  That is, at the connecting portion between the high-temperature superconducting wire 2 and the connecting high-temperature superconducting wire 3, as shown by a solid line arrow in FIG. Flows in the direction of the connecting high temperature superconducting wire 3 fixed on the upper surface, and from the other high temperature superconducting wire 2 in the direction of the connecting high temperature superconducting wire 3 fixed on the lower surface. Further, in the connection portion between the high-temperature superconducting wire 2 and the high-temperature superconducting wire 3 for connection, as shown by a solid line arrow in FIG. It flows from the high temperature superconducting wire 3 to the other high temperature superconducting wire 2 and from the connecting high temperature superconducting wire 3 fixed to the lower surface to the one high temperature superconducting wire 2.

Thereby, the path of the transport current (I _T ) flowing in the high temperature superconductor 1 is the other of the upstream pair of the high temperature superconductor 2 of the preceding pair as shown by the solid arrow in FIG. The transport current (I _T ) flowing through the high-temperature superconducting wire 2 changes the path that flows to one high-temperature superconducting wire 2 of the front-side high-temperature superconducting wire 2 at the connection portion 10. The path of the connecting portion 10 to the other high-temperature superconducting wire 2 is changed. Similarly, the transport current (I _T ) flowing through one high-temperature superconducting wire 2 upstream of the previous pair of high-temperature superconducting wires 2 is the other current of the front-side high-temperature superconducting wire 2 at the connection 10. The path that flows to the high-temperature superconducting wire 2 is changed, and further, the path that flows to the one high-temperature superconducting wire 2 of the next pair of high-temperature superconducting wires 2 is changed.

As described above, in the high-temperature superconducting conductor 1, the transport current (I _T ) flows while changing the path through the plural pairs of high-temperature superconducting wires 2 connected in the longitudinal direction at the connecting portion 10. As a result, the high-temperature superconducting conductor 1 can obtain the same effects as those obtained when dislocations are made at each connection portion 10. That is, in the high-temperature superconducting conductor 1, since the path through which the transport current ( _IT ) flows is limited, the induced electric field (E) generated when the fluctuating magnetic field (dB / dt) is applied is shown by a solid line in FIG. As indicated by the arrows and dotted arrows, it is canceled and the generation of the magnetizing current (I _M ) is suppressed. In FIG. 4, the high-temperature superconducting wires 2 forming a parallel pair are indicated by a solid line and a dotted line, respectively.

  In addition, since the high temperature superconducting conductors 1 are configured in such a manner that a plurality of high temperature superconducting wires 2 having the opposite laminated structure are arranged in parallel and connected in pairs in the longitudinal direction using the high temperature superconducting wires 3 for connection. The construction is simple and the manufacture is easy. Furthermore, even when winding is performed, the thickness is not increased by a three-dimensional intersection or the like, so that the winding work is facilitated.

As described above, the high-temperature superconducting conductor 1 is restricted in the same manner as when the path through which the transport current ( _IT ) flows is dislocated at the connection portion 10, and thus is generated when a variable magnetic field (dB / dt) is applied. The induced electric field (E) is canceled and the generation of the magnetizing current (I _M ) is suppressed. As a result, the current carrying capacity is reduced and the occurrence of AC loss is small, and the high-temperature superconducting conductor 1 can be easily manufactured. Even when the high-temperature superconducting wire 2 has a narrow width, it is possible to ensure a sufficient degree of freedom in designing the coil shape and dimensions when performing coil design, etc., making the design easy and winding at the time of coil manufacture. Line work is also easy.

  Next, a high temperature superconducting coil using the above-described high temperature superconducting conductor 1 will be described. 5 and 6, reference numeral 31 denotes a high-temperature superconducting coil, and the winding portion 32 of the high-temperature superconducting coil 31 covers the entire periphery of the high-temperature superconducting conductor 1 to which dislocation has been applied, and then turns-insulating material 33 Further, for example, the high-temperature superconducting conductor 1 is concentrically wound, wound into a so-called single pancake-shaped predetermined shape, coil-formed, and further impregnated with, for example, a thermosetting synthetic resin epoxy resin or the like The material 34 is formed by impregnation.

  When a current is passed through the high temperature superconducting coil 31, a magnetic field (B) is generated in the winding part 32 as indicated by the solid line arrow in FIG. The generated magnetic field (B) has such a distribution that the direction is indicated by the arrow and the strength is indicated by the thickness of the solid line. Note that the high-temperature superconducting coil 31 is provided with a terminal (not shown) or the like in the winding portion 32, and is attached via the terminal or the like, for example, a magnetic resonance imaging diagnosis apparatus (MRI) or a superconducting energy storage device. (SMES), used for superconducting applications such as single crystal pulling equipment.

  As described above, since the high-temperature superconducting coil 31 is formed by winding the high-temperature superconducting conductor 1 subjected to the primary dislocation described above, even when a fluctuating magnetic field is generated in the high-temperature superconducting coil 31, the conduction capacity is reduced. And less AC loss. That is, the high-temperature superconducting coil 31 of the present embodiment is manufactured using the high-temperature superconducting conductor 1 with reduced current carrying capacity and less AC loss when a varying magnetic field (dB / dt) is applied. When a magnetic field (dB / dt) is generated, the high-temperature superconducting coil 31 can be reduced in current carrying capacity and AC loss.

  In the high-temperature superconducting conductor 1 of the present embodiment, the high-temperature superconducting wire 3 for connection of the high-temperature superconducting conductor 1 has a rectangular flat plate shape and is fixed so as to sandwich the upper and lower surfaces of the high-temperature superconducting wire 2 at the same position. You may make it like the 1st thru | or 3rd modification of the high temperature superconducting conductor shown in FIG. 7 thru | or FIG.

  That is, in the high-temperature superconducting conductor 1a of the first modification shown in FIG. 7, the connecting high-temperature superconducting wire 15 is a hexagonal flat plate having the same width as the paired parallel high-temperature superconducting wires 2, and the high-temperature superconducting conductor 1 The left and right sides of the vertices facing each other in the longitudinal direction are symmetrical with respect to the longitudinal direction having a predetermined angle θ of less than 90 degrees with respect to the longitudinal direction. In general, as the thickness of the tape wire increases, the force required to bend increases, it becomes difficult to bend when winding a coil or the like, and the boundary other than the connection portion 10 and the connection portion 10 where the thickness changes rapidly. There is a risk that stress concentrates on the part when winding or the like, and mechanically damages the oxide superconducting layer 6 to deteriorate the superconducting characteristics.

  However, the high-temperature superconducting wire 15 for connection is bent by changing the width dimension gradually in the longitudinal direction in the longitudinal direction, such as a hexagonal shape or a polygonal shape or an elliptical shape that is not symmetrical to the longitudinal direction. The difficulty does not change abruptly, making it difficult for stress to concentrate at the boundary.

  The high-temperature superconducting conductor 1b of the second modification shown in FIG. 8 has a structure in which a step eliminating member 16 is provided at the longitudinal direction end of the rectangular connecting high-temperature superconducting wire 3 of the connecting portion 10. The step eliminating member 16 is, for example, a rectangular thin plate made of metal such as copper or stainless steel, polyimide resin Kapton (registered trademark), or meta-aramid resin Nomex (registered trademark). It is formed so as to gradually decrease from the same thickness as the high-temperature superconducting wire 3 for connection in the longitudinal direction. Since it has such a shape, similarly to the first modification, bending difficulty does not change abruptly at the boundary portion other than the connection portion 10 and the connection portion 10, and stress does not easily concentrate on the boundary portion. Note that the thickness change of the step eliminating member 16 may be changed stepwise, or may be an isosceles triangle shape without being limited to a square shape.

  Further, the high-temperature superconducting conductor 1c of the third modification shown in FIG. 9 is a rectangular flat plate-shaped high-temperature superconducting wire 3, and the upper and lower sides are not sandwiched between the upper and lower surfaces of the high-temperature superconducting wire 2 at the same position. The end positions are shifted in the longitudinal direction so as to be different. Thereby, similarly to the first modification, the bending difficulty does not change abruptly at the boundary portion other than the connection portion 10 and the connection portion 10, and the stress is less likely to concentrate on the boundary portion. Although not shown, the length in the longitudinal direction of the connecting high-temperature superconducting wire provided on the upper surface side and the lower surface side may be different.

  In the high-temperature superconducting conductor 1 of the present embodiment, the two high-temperature superconducting wires 2 forming a pair of the high-temperature superconducting conductors 1 have a configuration in which the connecting high-temperature superconducting wires 3 are fixed to each other in parallel. However, for example, the fourth to sixth modifications of the high-temperature superconducting conductor shown in FIGS. 10 to 12 may be used.

  That is, in the high-temperature superconducting conductor 1d of the fourth modification shown in FIG. 10, the two high-temperature superconducting wires 2 are arranged in parallel so that a minute gap is provided between them and the respective wide surfaces are the front and back surfaces. In this state, for example, the tape wire 17 of a flexible metal shape maintaining member such as copper or stainless steel is fixed to the upper and lower surfaces by soldering or the like, or although not shown, the tape wires 17 are arranged in parallel. The two high-temperature superconducting wires 2 are integrated by being wound around them.

  By doing so, the shape of the paralleled high-temperature superconducting wires 2 can be maintained, handling during winding work is facilitated, and two high-temperature superconducting wires generated when handling when not integrated. The stress is concentrated on the boundary portion of the connecting portion 10 integrated using the high-temperature superconducting wire 3 for connection due to the separation of the distance 2 and the like, causing mechanical damage to the oxide superconducting layer 6 and degrading the superconducting characteristics. This can be prevented by integrating the two high-temperature superconducting wires 2 other than the connecting portion 10, and there is no possibility of deterioration of superconducting characteristics. The shape maintaining member tape wire 17 is made of an insulating material such as polyimide resin Kapton (registered trademark) or meta-aramid resin Nomex (registered trademark), for example, to form two high-temperature superconducting wires 2. If the coil is wound around and integrated with each other, insulation between turns can be achieved while maintaining the shape and manufacturing the coil.

  Further, in the high temperature superconducting conductor 1e of the fifth modification shown in FIG. 11, the entire circumference of the two high temperature superconducting wires 2 arranged in parallel, including the space between both wires provided with a minute gap, is, for example, a polyimide resin. It is integrated by covering with a covering material 18 of a flexible shape maintaining member formed of an insulating material such as Kapton (registered trademark) or formal resin. By doing so, the shape of the paralleled high-temperature superconducting wires 2 can be maintained, handling during winding work and the like can be facilitated, and there is no possibility of deteriorating superconducting characteristics. And the coating | covering material 18 can be used as the insulation between turns at the time of coil manufacture.

  Further, the high-temperature superconducting conductor 1f of the sixth modification shown in FIG. 12 does not have the stabilizing layers 8 arranged in parallel, and the other laminated structure is the same as the high-temperature superconducting wire 2 described above. The stabilization layer 8a is integrally formed by covering the entire periphery of the high-temperature superconducting wire 2a with a stabilization layer 8a so as to serve also as a shape maintaining member, for example, so as to cover copper plating or the like. Yes. By doing so, the shape of the paralleled high-temperature superconducting wires 2a can be maintained, handling during winding work and the like is facilitated, and there is no possibility of deteriorating superconducting characteristics.

  Furthermore, the high-temperature superconducting conductor 1 of the high-temperature superconducting coil 31 in the present embodiment may be configured as, for example, a first modification of the high-temperature superconducting coil shown in FIG.

  As shown in FIG. 5, since the strength and direction of the magnetic field (B) generated by the high temperature superconducting coil 31 is distributed inside the coil, the magnetic field (B) applied to the high temperature superconducting conductor 1 is also the high temperature superconducting conductor 1. Will be distributed in the longitudinal direction. From this, in FIG. 13, the high-temperature superconducting conductor 1g used in the high-temperature superconducting coil of this modification has a distribution of the applied magnetic field (B) so that the magnetic flux (φ) integrated by the dislocation interval is equal. At the same time, the position of dislocation, that is, the position (interval of the connecting portion 10) at which a plurality of pairs of high-temperature superconducting wires 2b connected in the longitudinal direction are connected by the connecting high-temperature superconducting wire 3 is determined. The high temperature superconducting wire 2b has the same layered structure as the high temperature superconducting wire 2 described above.

  Since the high-temperature superconducting conductor 1g of the high-temperature superconducting coil is formed as described above, the induction electric field (E) can be canceled appropriately, and a variable magnetic field (dB / dt) is generated in the high-temperature superconducting coil. However, the current carrying capacity is reduced and the occurrence of AC loss is reduced. That is, according to this modification, a high-temperature superconducting coil is manufactured using the high-temperature superconducting conductor 1g in which the position of the dislocation is determined so that the induction electric field (E) is appropriately canceled as described above. When (dB / dt) is generated, a high-temperature superconducting coil with reduced current carrying capacity and less AC loss can be obtained. In FIG. 13, the high-temperature superconducting wires 2 forming a parallel pair of the high-temperature superconducting conductors 1g are shown by solid lines and dotted lines, respectively, and only one of them indicated by the solid lines is shown, but the other shown by the dotted lines is the same.

  Furthermore, the high-temperature superconducting coil 31 in the present embodiment may be a second modification of the high-temperature superconducting coil shown in FIG. 14, for example.

  That is, in FIG. 14, the winding portion 32 a of the high-temperature superconducting coil 31 a includes a release material 35 in which the high-temperature superconducting conductor 1 covering the inter-turn insulating material 33 is formed on the outer surface of one wide surface with a uniform width. It is formed by being wound so as to be provided and released, coiled into a predetermined shape, and then impregnated with an impregnating material 34. The release material 35 is made of, for example, fluorine resin, paraffin, various greases, silicone oil, or the like.

  Thereby, when cooling the high temperature superconducting coil 31a, the force acting on the high temperature superconducting wire 2 of the high temperature superconducting conductor 1 is relaxed, and deterioration of superconducting characteristics can be suppressed. That is, the high-temperature superconducting wire 2 used for the high-temperature superconducting conductor 1 is mechanically damaged even by a very weak tensile force in the thickness (tape thickness) direction, and the superconducting characteristics deteriorate. On the other hand, since the impregnating material 34 used in coil manufacture, for example, epoxy resin, has a higher thermal shrinkage rate than the material of other members used in the high-temperature superconducting coil 31a, the high-temperature superconducting material is particularly effective when cooling the high-temperature superconducting coil 31a. A tensile force is generated in the direction of the thickness of the wire 2 (tape thickness). For this reason, by performing a mold release treatment in which the mold release material 35 is interposed between one outer surface of the wide surface which is the surface in the thickness direction of the high temperature superconducting wire 2 of the high temperature superconducting conductor 1 and the impregnating material 34, The acting tensile force is relaxed, and the deterioration of the superconducting characteristics is suppressed. As a result, it is possible to reduce the risk of deterioration of superconducting characteristics in the high-temperature superconducting conductor 1 that occurs when the high-temperature superconducting coil 31a is cooled.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIGS. In the present embodiment, since the high-temperature superconducting conductor 1 of the first embodiment is used as a primary dislocation conductor, a high-temperature superconducting conductor that is a higher-order (secondary) dislocation conductor is configured. The same reference numerals are given to the same parts and the description thereof is omitted, and the configuration of the embodiment of the present invention different from the first embodiment will be described.

  First, a description will be given with reference to FIGS. Reference numeral 21 denotes a primary dislocation conductor, and the primary dislocation conductor 21 is configured similarly to the high-temperature superconducting conductor 1 of the first embodiment. Further, the longitudinal end of the primary dislocation conductor 21, that is, the longitudinal end of the two high-temperature superconducting wires 2 forming a pair with a predetermined length is provided on the upper surface of the end of the single high-temperature superconducting wire 2. An end high-temperature superconducting wire 22 is fixed by solder 9. The end high-temperature superconducting wire 22 is bent into a substantially Z shape in which a step having the same dimension as the thickness of the high-temperature superconducting wire 2 is formed. The high-temperature superconducting wire 22 is formed in the same width as the high-temperature superconducting wire 2. 2, a multilayer structure in which an intermediate layer 5, an oxide superconducting layer 6, and a protective layer 7 are sequentially laminated on the metal substrate layer 4, and the stabilization layer 8 is formed so as to cover all the laminated layers. It is covered. In addition, the connection between the high-temperature superconducting wires 2 of the front and rear pairs in the longitudinal direction is made by a connecting high-temperature superconducting wire 3.

  Further, the two high-temperature superconducting wires 2 forming a pair of primary dislocation conductors 21 are arranged in parallel so that a minute gap is provided between them and the wide surface is the front and back surfaces. As shown in FIG. 16 (a), which is a cross-sectional view in the direction of the arrow in the cross section W of FIG. 15, the two high-temperature superconducting wires 2 arranged in parallel have their layers stacked upside down. In one high temperature superconducting wire 2, the metal substrate layer 4 is positioned on the upper side, and in the other high temperature superconducting wire 2, the metal substrate layer 4 is positioned on the lower side. Further, the stacking order of the layers of the end high-temperature superconducting wire 22 fixed to the upper surface of the other end of the high-temperature superconducting wire 2 is such that the metal substrate layer 4 is positioned on the upper side. Further, as shown in FIG. 16 (b), which is a cross-sectional view in the direction of the arrow in cross section X of FIG. 15, one high-temperature superconducting wire 2 and end high-temperature superconducting wire 22 are laminated in the most advanced portion. The order is the same and they are in parallel.

  Next, a description will be given with reference to FIGS. Reference numeral 23 denotes a high-temperature superconducting conductor, and this high-temperature superconducting conductor 23 is formed so as to perform secondary dislocations using the primary dislocation conductor 21 configured as described above. In this high-temperature superconducting conductor 23, the primary dislocation conductor 21 can be considered as corresponding to the high-temperature superconducting wire 2 in the high-temperature superconducting conductor 1 of the first embodiment described above. Connections are made as expected.

  The high-temperature superconducting conductor 23 is composed of two primary dislocation conductors 21 formed by combining two high-temperature superconducting wires 2 forming a pair, and a plurality of the combined primary dislocation conductors 21 in the longitudinal direction. A rectangular flat plate-shaped high-temperature superconducting wire 24 having a wide surface (tape surface) connected to the primary dislocation conductor 21 and having a width approximately twice that of the primary dislocation conductor 21 (approximately four times the width of the high-temperature superconducting wire 2); It is constituted by. As shown in FIG. 16, the connecting high-temperature superconducting wire 24 is an intermediate layer 5 formed on the tape-like metal substrate layer 4 with a uniform width, like the high-temperature superconducting wire 2 and the end high-temperature superconducting wire 22. The oxide superconducting layer 6 and the protective layer 7 are laminated in order.

  The two primary dislocation conductors 21 that constitute the high-temperature superconducting conductor 23 are arranged in parallel so that a minute gap is provided between them and the wide surfaces thereof are the front and back surfaces (upper and lower surfaces). The two primary dislocation conductors 21 that have been parallelized and paralleled have the stacking order of the layers at the end to which the high-temperature superconducting wire 22 for the end is fixed in the upside down direction. The primary dislocation conductor 21 on one side in the previous set, which is the previous set, has the metal substrate layer 4 on the lower side, and the primary dislocation conductor 21 on the other side has the metal substrate layer 4 on the upper side. Further, in the two primary dislocation conductors 21 in the rear group, which is the next group (later group) connected in the longitudinal direction with a predetermined interval to the primary dislocation conductor 21 in the previous group, the primary primary conductor on one side The dislocation conductor 21 has the metal substrate layer 4 on the upper side, and the other primary dislocation conductor 21 has the metal substrate layer 4 on the lower side.

  Furthermore, the upper and lower surfaces of the ends of the primary dislocation conductors 21 that are paired in the longitudinal direction and adjacent to each other, that is, the high-temperature superconducting wire 2 forming the ends and the high-temperature superconducting wires for the ends. The high-temperature superconducting wires 24 for connection are fixed to the upper and lower surfaces 22 by solder 9 so as to be electrically connected to each other, so that a connection portion 25 is formed, and two sets of primary dislocation conductors 21 are connected. Then, the stacking order of each layer of the high temperature superconducting wire 24 for connection fixed to the lower surface of the two sets of primary dislocation conductors 21 is shown in FIG. Thus, in the same order as the stacking order of the primary dislocation conductors 21 on one side of the previous set, the high-temperature superconducting wire 24 for connection with the metal substrate layer 4 positioned on the lower side and fixed on the upper surface is, conversely, The same as the stacking order of the primary dislocation conductors 21 on the other side, the metal substrate layer 4 is located on the upper side.

  Note that the stacking order of each layer of the high-temperature superconducting wire 24 for connection is as shown in FIG. 18 (b) with respect to the two primary dislocation conductors 21 in the rear group, as shown in the cross-sectional view in the direction of the arrow Z in FIG. Contrary to the case of the previous set, the connection high-temperature superconducting wire 24 fixed to the lower surface and the primary dislocation conductor 21 on the other side have the same stacking order, and the connecting high-temperature superconducting wire 24 fixed to the upper surface is The stacking order of the primary dislocation conductors 21 on the one side is the same.

  In the high-temperature superconducting conductor 23 configured as described above, the intermediate layer 5 is formed of an electrical insulator, as in the first embodiment, so that the current flowing through the oxide superconducting layer 6 is the intermediate layer. It is difficult to flow out in the direction penetrating 5. Therefore, the current flowing in the oxide superconducting layer 6 flows as follows in the connection portion 25 in which the upper and lower connecting high-temperature superconducting wires 24 are fixed and the two pairs of primary dislocation conductors 21 in the front and rear are connected.

  That is, at the connecting portion between the primary dislocation conductor 21 and the connecting high-temperature superconducting wire 24 in the previous group, as shown by the solid line arrow in FIG. From 21, it flows in the direction of the connecting high temperature superconducting wire 24 fixed on the upper surface, and from the primary dislocation conductor 21 on the other side in the direction of the connecting high temperature superconducting wire 24 fixed on the lower surface. Further, at the connection portion of the rear primary dislocation conductor 21 and the connecting high-temperature superconducting wire 24, as shown by the solid line arrow in FIG. It flows in the direction from the high-temperature superconducting wire 24 to the primary dislocation conductor 21 on the other side, and from the connecting high-temperature superconducting wire 24 fixed to the lower surface to the primary dislocation conductor 21 on the one side.

Thereby, the path of the transport current (I _T ) flowing through the primary dislocation conductor 21 is the two primary dislocation conductors of the previous set as shown by solid arrows in FIG. 19 where the high temperature superconducting wires 3 and 24 for connection are omitted. The transport current (I _T ) that has flowed through the primary dislocation conductor 21 on one side in 21 changes the path that flows to the primary dislocation conductor 21 on the other side in the rear group at the connection portion 25. Similarly, the transport current (I _T ) that flows through the primary dislocation conductor 21 on the other side in the previous group changes the path that flows to the primary dislocation conductor 21 on the one side in the rear group at the connection portion 25. In each group of primary dislocation conductors 21, as in the first embodiment, between the two high-temperature superconducting conductors 1 forming a pair, one is connected to the other by the connecting portion 10, or Conversely, the transport current (I _T ) flows from one side to the other while changing the path.

As described above, in the high-temperature superconducting conductor 23, the transport current (I _T ) flows while changing the path through the plural sets of primary dislocation conductors 21 connected in the longitudinal direction. As a result, the high-temperature superconducting conductor 23 can obtain the same effects as those obtained when dislocations are made at the connection portions 10 and 25. That is, as in the first embodiment described above, the high-temperature superconducting conductor 23 has a primary dislocation conductor when the path through which the transport current ( _IT ) flows is limited and a variable magnetic field (dB / dt) is applied. The induced electric field (E) generated in the current path 21 is canceled, and the generation of the magnetizing current (I _M ) is suppressed.

  Further, a plurality of pairs of high-temperature superconducting wires 2 having a reverse laminated structure are connected in parallel in the longitudinal direction, and the paired high-temperature superconducting wires 2 are used as primary dislocation conductors 21. Since the high-temperature superconducting conductor 23 is constituted by connecting a plurality of sets of reverse primary dislocation conductors 21 in parallel to each other in the longitudinal direction, the connecting portions 10 and 25 have a simple configuration and are manufactured. Becomes easy. Furthermore, even when winding is performed, the thickness is not increased by a three-dimensional intersection or the like, so that the winding work is facilitated.

As described above, the high-temperature superconducting conductor 23 is restricted in the same manner as when the path through which the transport current (I _T ) flows is transferred at the connection portions 10 and 25, and therefore, when a variable magnetic field (dB / dt) is applied. The induced electric field (E) generated in is canceled and the generation of the magnetizing current (I _M ) is suppressed. As a result, the current carrying capacity is reduced and the occurrence of AC loss is small, and the high-temperature superconducting conductor 23 can be easily manufactured. Even when the high-temperature superconducting wire 2 has a narrow width, it is possible to ensure a sufficient degree of freedom in designing the coil shape and dimensions when performing coil design, etc., making the design easy and winding at the time of coil manufacture. Line work is also easy.

  The case where a dislocation is obtained as a secondary dislocation conductor has been described above. However, when a dislocation is obtained as a tertiary dislocation conductor, a secondary dislocation conductor is used, and this is replaced with the primary dislocation conductor 21 described above. What is necessary is just to comprise by the same method, and when making it higher order (multiple order) which increased dislocation, it can obtain by repeating the same method.

  That is, the high-temperature superconducting conductor 1 of the first embodiment is used as the primary dislocation conductor 21, and the (p + 1) th order (higher order) dislocation with higher dislocations than the pth order (lower order) dislocation conductor (p ≧ 1). When obtaining a high-temperature superconducting conductor, a p-order (low-order) low-order dislocation conductor has the same stacking direction of each layer of the high-temperature superconducting wire 2 at the end, and the end is the same plane. Electrically connect high-temperature superconducting wires. Then, the low-order dislocation conductors in which the layers of the high-temperature superconducting wires 2 are laminated in the same direction are parallelized by making the layering directions of the layers of the high-temperature superconducting wires 2 at the ends reverse. A low-order dislocation conductor is obtained.

  Further, the paralleled low-order dislocation conductor is connected to another parallel-ordered low-order dislocation conductor that is connected at the connecting portion, and the high-temperature superconducting wire 2 at the end portion is connected between the low-order dislocation conductors adjacent in the longitudinal direction. The layers are arranged so that the stacking direction is reversed, and a predetermined interval in the longitudinal direction is provided between the end portions. Four low-order dislocation conductors arranged in parallel before and after the arranged low-order dislocation conductors are electrically connected by a high-temperature superconducting wire for connection, and connected at the connection portion, and (p + 1) order (high Next, a high-temperature superconducting conductor is obtained. By repeating this, it is possible to obtain a higher-order multiple-order high-temperature superconducting conductor.

  In addition, the high-temperature superconducting conductor 23 of the present embodiment is also configured with the connecting portion 25 or the parallel primary dislocation conductor 21 connected to the tape wire 17 in the same manner as each modification of the first embodiment. Or may be integrated by a covering material 18 or the like.

  A high-temperature superconducting coil (not shown) formed by rolling the high-temperature superconducting conductor 23 reduces the current carrying capacity when a varying magnetic field (dB / dt) is applied, as in the first embodiment. And a high-temperature superconducting coil 23 that generates less AC loss, and therefore, when a fluctuating magnetic field (dB / dt) is generated, a high-temperature superconducting coil that reduces current carrying capacity and generates less AC loss. be able to.

  According to the above embodiment, in the high-temperature superconducting conductor, when forming the coil, dislocation within the coil using a narrow high-temperature superconducting wire is possible, and sufficient design freedom of the coil shape and dimensions is ensured. In addition, in the high-temperature superconducting coil, the coil design is easy, and the winding work at the time of coil manufacture can be facilitated.

1, 1a, 1b, 1c, 1d, 1e, 1f, 1g, 23 ... high temperature superconducting conductor, 2, 2a, 2b ... high temperature superconducting wire, 3, 15, 24 ... high temperature superconducting wire for connection, 4 ... metal substrate layer, DESCRIPTION OF SYMBOLS 5 ... Intermediate | middle layer, 6 ... Oxide superconducting layer, 7 ... Protective layer, 8, 8a ... Stabilizing layer, 9 ... Solder 10, 25 ... Connection part, 16 ... Level | step difference elimination member, 17 ... Tape wire, 18 ... Covering 21 ... primary dislocation conductor, 22 ... high temperature superconducting wire for end, 31, 31a ... high temperature superconducting coil, 32, 32a ... winding part, 33 ... inter-turn insulating material, 34 ... impregnating material, 35 ... release material

Claims (12)

A tape-shaped high-temperature superconducting wire having a predetermined length, which is formed by sequentially laminating a metal substrate layer, an intermediate layer of an electrical insulator, and an oxide superconducting layer in order, has a small gap between each other and forms a wide surface on the same surface. A high-temperature superconducting conductor in which a plurality of the high-temperature superconducting wires arranged side by side in parallel and connected in parallel in the longitudinal direction with a predetermined interval are connected,
In the paralleled high-temperature superconducting wire, the stacking order of each layer in at least one of the paralleled high-temperature superconducting wires is opposite to the stacking order of each layer in the other high-temperature superconducting wire, and the connection portion is The two high-temperature superconducting wires for connection are fixed to the upper and lower surfaces of each end of the parallel-connected high-temperature superconducting wires adjacent to each other so as to be electrically connected to each other. A high-temperature superconducting conductor characterized in that   The paralleled high-temperature superconducting wires are the two high-temperature superconducting wires, and the two paralleled high-temperature superconducting wires adjacent to each other at a predetermined interval in the connecting portion are adjacent to each other in the longitudinal direction. The stacking order of each layer is reversed between the high-temperature superconducting wires and the electrical connection of the four high-temperature superconducting wires of the two paralleled high-temperature superconducting wires at the connection portion is the connection. 2. The high-temperature superconducting conductor according to claim 1, wherein the high-temperature superconducting conductor is made of a high-temperature superconducting wire. A high-temperature superconducting conductor of a high-order dislocation conductor in which the high-temperature superconducting conductor according to claim 2 is a primary dislocation conductor, and the dislocations are multi-ordered using a low-order dislocation conductor,
The high-temperature superconducting wires for ends are electrically connected so that the lamination directions of the layers of the high-temperature superconducting wires are the same at the ends of the low-order dislocation conductors, and the lamination directions of the layers of the high-temperature superconducting wires are The low-order dislocation conductors aligned in the same direction are paralleled so that the stacking direction of each layer of the high-temperature superconducting wire at the end is reversed, and connected to the paralleled low-order dislocation conductors Lamination of the respective layers of the high-temperature superconducting wires at the ends of the four low-order unit conductors adjacent to each other in the longitudinal direction of the low-order dislocation conductors that are connected in parallel at a predetermined interval in the longitudinal direction. A high-temperature superconducting conductor characterized by being electrically connected so that the directions are reversed.   The shape of the end portion in the longitudinal direction of the high-temperature superconducting wire for connection is one in which the width dimension is gradually decreased in the distal direction with respect to the longitudinal direction. The high-temperature superconducting conductor according to item.   4. The high-temperature superconducting conductor according to claim 1, wherein a step eliminating member is disposed at an end portion in a longitudinal direction of the high-temperature superconducting wire for connection. 5.   4. The high temperature superconducting conductor according to claim 1, wherein the position of the end portion in the longitudinal direction of the connecting high temperature superconducting wire is different on both sides of the upper and lower surfaces of the high temperature superconducting conductor. 5. .   The high-temperature superconducting conductor according to any one of claims 1 to 6, wherein a flexible tape wire is fixed or wound.   The high-temperature superconducting conductor according to any one of claims 1 to 6, wherein the high-temperature superconducting conductor is coated with a flexible covering material.   The high-temperature superconducting conductor according to any one of claims 1 to 6, wherein the paralleled high-temperature superconducting wires are integrated by a metal protective layer.   A high-temperature superconductivity characterized in that the high-temperature superconducting conductor according to any one of claims 1 to 9 is wound, coil-molded, and then impregnated with a thermosetting synthetic resin to form a winding portion. coil.   The position of the longitudinal direction of the connection part which connects a high temperature superconducting wire with the high temperature superconducting wire for connection is determined so that the magnetic flux which the said high temperature superconducting conductor may experience inside a coil may be canceled. High temperature superconducting coil.   The high temperature superconducting coil according to claim 10, wherein at least part of the surface of the high temperature superconducting conductor is subjected to a release treatment.

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