JP5434280B2 - Superconducting coil and method of manufacturing superconducting coil - Google Patents

Description

  The present invention relates to a superconducting coil and a method for manufacturing a superconducting coil.

  Conventionally, a superconducting coil including a winding frame, a superconducting wire wound around the winding frame, and an electrode attached to the superconducting wire is known. As such superconducting coils, for example, JP 2009-49036 A (Patent Document 1), JP 2009-16622 A (Patent Document 2), JP 2009-16620 A (Patent Document 3), and JP 7 A 7 A. -142233 gazette (patent document 4), Unexamined-Japanese-Patent No. 2000-114029 (patent document 5), etc. are mentioned.

JP 2009-49036 A JP 2009-16622 A JP 2009-16620 A JP-A-7-142233 JP 2000-114029 A

  The electrodes used for the superconducting coils as in Patent Documents 1 to 5 are generally soldered to a superconducting wire. A large stress may be applied to the electrode during wiring work or the like. When stress is applied to the electrodes of Patent Documents 1 to 3, damage is applied to the superconducting wire connected to the electrodes. For this reason, there existed a problem that the characteristic of a superconducting coil deteriorated.

  In Patent Documents 4 and 5, a resin cover is placed on the inner peripheral surface, outer peripheral surface, upper surface, and lower surface of the superconducting wire. Therefore, there is a problem that the superconducting coil becomes large.

  Therefore, an object of the present invention is to provide a superconducting coil and a method of manufacturing the superconducting coil in which deterioration of characteristics is suppressed and enlargement is suppressed.

The superconducting coil of the present invention includes a winding frame, a superconducting wire, an electrode, a connecting portion, and a fixing portion. The superconducting wire is wound around a winding frame. The electrode is attached to the superconducting wire. The connecting part connects the winding frame and the electrode. The fixing portion fixes the connecting portion and the winding frame, and fixes the connecting portion and the electrode. At this time, a superconducting wire is disposed between the winding frame and the electrode.

The superconducting coil manufacturing method of the present invention includes the following steps. Wrap the superconducting wire around the reel. Attach an electrode to the superconducting wire . The winding frame and the electrode are connected by a connecting portion. The connecting portion and the winding frame are fixed using the fixing portion, and the connecting portion and the electrode are fixed. At this time, a superconducting wire is disposed between the winding frame and the electrode.

  According to the superconducting coil and the manufacturing method thereof of the present invention, the connecting portion, the electrode, and the winding frame are fixed using the fixing portion. For this reason, the stress applied to an electrode can be transmitted to a winding frame via a connection part. Therefore, since the stress applied to the superconducting wire can be reduced, deterioration of the characteristics of the superconducting coil can be suppressed.

  Moreover, the electrode and the winding frame are fixed at the connecting portion using the fixing portion. For this reason, even if it does not arrange | position a connection part in the location where the electrode is not located, it has the effect which can suppress the deterioration of the characteristic of the said superconducting coil. Therefore, an increase in the size of the superconducting coil can be suppressed.

  In the superconducting coil, the material constituting the connecting portion is preferably stainless steel.

  Preferably, in the method for manufacturing a superconducting coil, a connecting portion made of stainless steel is used in the connecting step.

  Stainless steel is a strong and high resistance material. Since the strength is strong, the strength of the connecting portion can be maintained. Since it is possible to suppress the generation of eddy current due to the high resistance, the superconducting coil can be suitably used for AC applications.

  In the superconducting coil, the material constituting the winding frame is preferably stainless steel or an insulating material.

  In the method for manufacturing a superconducting coil, preferably, the winding step uses a winding frame made of stainless steel or an insulating material.

  Thereby, since it can suppress that an eddy current generate | occur | produces, a superconducting coil can be used suitably for an alternating current use.

  As described above, according to the superconducting coil and the method of manufacturing a superconducting coil of the present invention, it is possible to suppress the deterioration of characteristics and suppress the increase in size.

It is a perspective view which shows roughly the superconducting coil in embodiment of this invention. It is an enlarged view in the area | region II in FIG. FIG. 3 is a schematic sectional view taken along line III-III in FIG. 2. FIG. 4 is a schematic cross-sectional view taken along line IV-IV in FIG. 2. It is sectional drawing which shows roughly the superconducting wire in embodiment of this invention. It is sectional drawing which shows roughly the superconducting wire in embodiment of this invention. 6 is a cross-sectional view schematically showing a superconducting coil in Comparative Example 1. FIG. It is sectional drawing which shows schematically the superconducting coil in the comparative example 2.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following drawings, the same or corresponding parts are denoted by the same reference numerals, and description thereof will not be repeated.

  A superconducting coil 10 according to an embodiment of the present invention will be described with reference to FIGS. As shown in FIGS. 1 to 4, the superconducting coil 10 in the present embodiment includes a winding frame 11, a superconducting wire 12, an electrode 13, a connecting portion 14, and fixing portions 15 a and 15 b. Superconducting wire 12 is wound around winding frame 11. The electrode 13 is attached to the superconducting wire 12. The connecting portion 14 connects the winding frame 11 and the electrode 13. The fixing parts 15a and 15b fix the connecting part 14 and the reel 11 and fix the connecting part 14 and the electrode 13, respectively.

  As shown in FIG. 1, the inside of the winding frame 11 is opened, and a superconducting wire 12 is wound around the outer periphery of the winding frame 11. Although the material which comprises the reel 11 is not specifically limited, It is preferable that they are stainless steel (SUS) or an insulating material. As the insulating material, for example, FRP (Fiber Reinforced Plastics) can be used.

  Superconducting wire 12 is wound around winding frame 11 to form a coil. In this embodiment, as shown in FIG. 1, it is a double pancake type coil, but the winding type is not particularly limited, and a double pancake type coil, a single pancake type coil, a superconducting wire is wound in a spiral shape. A coil or the like can be used.

  The superconducting wire 12 has a tape shape, and a bismuth (Bi) -based superconducting wire may be used as shown in FIG. 5, or a thin film superconducting wire may be used as shown in FIG.

  As shown in FIG. 5, the bismuth-based superconducting wire has a plurality of superconductors 12a extending in the longitudinal direction and a sheath portion 12b covering the entire circumference of the plurality of superconductors 12a. The sheath portion 12b is in contact with the superconductor 12a. Each of the plurality of superconductors 12a is preferably a bismuth-based superconductor having a composition of, for example, Bi—Pb—Sr—Ca—Cu—O, and in particular, an atomic ratio of (bismuth and lead): strontium: calcium: copper. Is optimally a material containing a Bi2223 phase represented by an approximate ratio of 2: 2: 2: 3. The material of the sheath portion 12b is made of, for example, silver or a silver alloy. A single superconductor 12a may be provided.

  As shown in FIG. 6, the thin film superconducting wire is formed on the substrate 12c, the intermediate layer 12d provided in contact with the substrate 12c, the superconducting layer 12e provided in contact with the intermediate layer 12d, and the superconducting layer 12e. And a stabilizing layer 12f provided in contact therewith.

  The substrate 12c is made of metal such as stainless steel, nickel alloy (for example, Hastelloy), or silver alloy. The intermediate layer 12d is made of, for example, yttria-stabilized zirconia, cerium oxide, magnesium oxide, or strontium titanate. The intermediate layer 12d may be omitted.

Superconducting layer 12e is made of, for example, an RE123-based superconductor. The RE123-based superconductor, the _{RE x Ba y Cu z O 7} -d, is 0.7 ≦ x ≦ 1.3,1.7 ≦ y ≦ 2.3,2.7 ≦ z ≦ 3.3 Means that. The RE of the RE123-based superconductor means a material containing at least one of a rare earth element and an yttrium element. Examples of rare earth elements include neodymium (Nd), gadolinium (Gd), holmium (Ho), and samarium (Sm). The RE123-based superconducting wire has the advantage that the critical current density at the liquid nitrogen temperature (77.3 K) is higher than that of the bismuth-based superconducting wire. Moreover, it has the advantage that the critical current value is high under low temperature and constant magnetic field. On the other hand, since the RE123-based superconductor cannot be covered with the sheath portion unlike the bismuth-based superconductor, the superconductor (superconducting thin film material) is formed on the oriented metal substrate only by the vapor phase method or the liquid phase method. It is manufactured by the method.

  The stabilizing layer 12f is a layer provided for protecting the surface of the superconducting layer 12e, and is made of, for example, silver or copper. The stabilization layer 12f may be omitted.

  As shown in FIG. 3, the electrode 13 is formed at the end of the superconducting wire 12 located on the outermost periphery. In the present embodiment, since the superconducting coil is of a double pancake type, electrodes 13 are formed at two positions located at the end of the superconducting wire 12 as shown in FIG. The electrode 13 is provided for connecting a lead wire. For example, a copper (Cu) terminal can be used as the electrode 13.

  The electrode 13 has an arc-shaped portion to be attached to the superconducting wire 12, and is soldered to the superconducting wire 12 at the arc-shaped portion. The electrode 13 is provided with a through hole 13a for inserting a bolt, and a terminal of a lead wire terminal is connected to the through hole 13a by bolting. The number of through holes 13a can be arbitrarily selected depending on the current capacity.

  The connecting portion 14 covers from the inner peripheral side to the outer peripheral side of the superconducting coil 10 in the region where the electrode 13 is located. In other words, the connecting portion 14 is formed on the winding frame 11, the superconducting wire 12, and the electrode 13. In other words, as shown in FIG. 4, the connecting portion 14 is not formed in a region where the electrode 13 is not formed.

  Although the material which comprises the connection part 14 is not specifically limited, It is preferable that it is stainless steel (SUS) or an insulating material, and it is more preferable that it is stainless steel.

  The shape of the connecting portion 14 is not particularly limited, but is preferably high in strength from the viewpoint of protecting the superconducting wire 12 and is preferably a reinforcing plate having higher mechanical strength than the electrode 13. Moreover, as shown in FIG. 3, when the connection part 14 is plate shape, the superconducting coil 10 can be laminated | stacked.

  Moreover, it is preferable that the connection part 14 is a material close | similar to the thermal contraction rate of the winding frame 11 and the electrode 13. FIG. As such a material, for example, when the reel 11 is FRP and the electrode 13 is Cu, the connecting portion 14 is preferably SUS or FRP.

  As shown in FIG. 2, the width W14 of the connecting portion 14 is preferably short. When the width W14 is short, eddy current can be reduced. The width W14 is, for example, winding width + 10 mm to winding width + 100 mm.

  As shown in FIGS. 2 and 3, the fixing portion 15 a fixes the connecting portion 14 and the reel 11. The fixing part 15b fixes the connecting part 14 and the electrode 13. The fixing portions 15a and 15b are, for example, screws. The fixing portions 15a and 15b may be the same or different. Further, the fixing portions 15a and 15b may be separated (a plurality) or may be integrated (one). In the case where the fixing portion is integral, for example, an adhesive or the like can be used.

  The superconducting coil 10 preferably further includes an insulating material such as FRP formed between the electrode 13 and the connecting portion 14. In this case, the electrode 13 and the connecting portion 14 are insulated.

  Then, the manufacturing method of the superconducting coil 10 in this Embodiment is demonstrated. First, as shown in FIGS. 1 to 4, the superconducting wire 12 is wound around the winding frame 11. The winding method is not particularly limited, and the superconducting wire 12 is wound around the winding frame 11 like a double pancake type, a single pancake type, or a spiral shape.

  In the winding step, the above-described reel 11 can be used, and it is preferable to use the reel 11 made of stainless steel or an insulating material. As the superconducting wire 12, a superconducting wire 12 as shown in FIGS. 5 and 6 can be used.

  Next, the electrode 13 is attached to the superconducting wire 12. As the superconducting wire 12 and the electrode 13, those described above can be used. The method for attaching the electrode 13 is not particularly limited, but the superconducting wire 12 and the electrode 13 are connected by, for example, soldering.

  Next, the winding frame 11 and the electrode 13 are connected by the connecting portion 14. In the connecting step, the connecting portion 14 as described above can be used, and it is preferable to use the connecting portion 14 made of stainless steel. Further, in this connecting step, for example, the connecting portion 14 is disposed on the winding frame 11, the superconducting wire 12 and the electrode 13.

  Next, using the fixing portions 15a and 15b, the connecting portion 14 and the reel 11 are fixed, and the connecting portion 14 and the electrode 13 are fixed. In the connecting step, the fixing portion as described above can be used. For example, in a state where the connecting portion 14 is disposed on the winding frame 11, the superconducting wire 12 and the electrode 13, the winding frame 11 and the connecting portion 14 are connected by the fixing portion 15a, and the electrode 13 and the connecting portion 14 are connected by the fixing portion 15b. Connect with

  By performing the above steps, the superconducting coil 10 shown in FIGS. 1 to 4 can be manufactured.

  Next, the effect of the superconducting coil 10 in the present embodiment will be described in comparison with the superconducting coils 100 and 200 of Comparative Example 1 and Comparative Example 2 shown in FIGS. 7 and 8. 7 and 8 show a cross section in the major axis direction at a position including an electrode in a single pancake type superconducting coil.

  As shown in FIG. 7, the superconducting coil 100 of Comparative Example 1 includes a winding frame 11, a superconducting wire 12, an electrode 13, and a resin 101. The winding frame 11, the superconducting wire 12 and the electrode 13 of Comparative Example 1 are the same as the superconducting coil 10 of the present embodiment. Resin 101 covers the outer periphery of winding frame 11, superconducting wire 12, and electrode 13. The manufacturing method of the superconducting coil 100 of Comparative Example 1 is integrated by impregnating the winding frame 11, the superconducting wire 12, and the electrode 13 with the resin 101. The superconducting coil 100 of Comparative Example 1 is similar to Patent Documents 1 to 3 described above.

  In the superconducting coil 100 of Comparative Example 1, when a large stress is applied to the electrode 13 during wiring work or the like, the superconducting wire 12 connected to the electrode 13 is damaged. For this reason, there exists a problem that the characteristic of the superconducting coil 100 deteriorates.

  Further, when a lead wire terminal is connected to the electrode 13, this terminal is bent when a large stress is applied to the electrode 13. For this reason, there exists a problem that the characteristic of the characteristic of the superconducting coil 100 deteriorates.

  In general, the energization current may be small, and the shape of the electrode 13 is as small as, for example, a width of 10 m, a height of 0.5 mm, and a length of 10 mm. However, if a large electrode that allows a large current to flow is used as the electrode 13, the electrode 13 itself becomes heavy. For this reason, there exists a problem that the electrode 13 cannot be fixed to the superconducting wire 12 stably.

  Next, as shown in FIG. 8, the superconducting coil 200 of Comparative Example 2 includes a winding frame 11, a superconducting wire 12, an electrode 13, a fixing portion 115, and a flange 201. The winding frame 11, the superconducting wire 12 and the electrode 13 of Comparative Example 2 are the same as the superconducting coil 10 of the present embodiment. The flange 201 is formed so as to cover all the upper and lower surfaces of the winding frame 11, the superconducting wire 12, and the electrode 13. The fixing portion 115 connects the flange 201 and the electrode 13. The superconducting coil 200 of Comparative Example 2 is similar to Patent Documents 4 and 5 above.

  The superconducting coil 200 of Comparative Example 2 covers the entire winding frame 11, superconducting wire 12, and electrode 13 with a flange 201. For this reason, the stress applied to the electrode 13 can be reduced. However, there is a problem that the superconducting coil 200 becomes large due to the flanges 201 provided above and below the superconducting coil 200.

  On the other hand, the superconducting coil 10 according to the present embodiment fixes the connecting portion 14 and the electrode 13 and fixes the connecting portion 14 and the winding frame 11 using the fixing portions 15a and 15b. For this reason, the stress applied to the electrode 13 can be transmitted to the winding frame 11 through the connecting portion 14. That is, the stress applied to the electrode 13 can be received by the reel 11. Therefore, since the stress applied to the superconducting wire 12 can be reduced, the deterioration of the characteristics of the superconducting coil 10 can be suppressed.

  In addition, when a lead wire terminal is connected to the electrode 13, even if a large stress is applied to the electrode 13, the stress can be transmitted to the winding frame 11 through the connecting portion 14, so that this terminal is bent. Can be suppressed. Therefore, the characteristic of the superconducting coil 10 can suppress deterioration.

  Further, when a large electrode that allows a large current to flow is used as the electrode 13, the weight of the electrode 13 can also be borne by the winding frame 11 via the connecting portion 14 even if the electrode 13 itself becomes heavy. . For this reason, the electrode 13 can be stably fixed to the superconducting wire 12.

  Furthermore, the electrode 13 and the reel 11 are fixed by the connecting portion 14 using the fixing portions 15a and 15b. For this reason, there exists an effect which can suppress the deterioration of the characteristic of the said superconducting coil 10 by arrange | positioning the connection part 14 only in the location in which the electrode 13 is located. In other words, it is possible to suppress the deterioration of the characteristics of the superconducting coil 10 even if the connecting portion 14 is not disposed at a position where the electrode 13 is not located. Therefore, the enlargement of the superconducting coil 10 can be suppressed.

  As described above, according to the superconducting coil 10 and the manufacturing method thereof in the present embodiment, it is possible to suppress the deterioration of characteristics and suppress the increase in size. Furthermore, according to superconducting coil 10 and the manufacturing method thereof in the present embodiment, electrode 13 can be stably fixed to superconducting wire 12.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above-described embodiment but by the scope of claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

  10 superconducting coil, 11 winding frame, 12 superconducting wire, 12a superconductor, 12b sheath part, 12c substrate, 12d intermediate layer, 12e superconducting layer, 12f stabilization layer, 13 electrodes, 13a through hole, 14 connecting parts, 15a, 15b Fixed part, W14 width.

Claims (6)

A reel,
A superconducting wire wound around the winding frame;
An electrode attached to the superconducting wire;
A connecting portion connecting the before and Kimakiwaku electrode,
A fixing portion for fixing the connecting portion and the winding frame, and fixing the connecting portion and the electrode;
A superconducting coil in which the superconducting wire is disposed between the winding frame and the electrode .   The superconducting coil according to claim 1, wherein a material constituting the connecting portion is stainless steel. The superconducting coil according to claim 1 or 2, wherein the material constituting the winding frame is stainless steel or an insulating material. Winding a superconducting wire around a winding frame;
Attaching an electrode to the superconducting wire;
A step of connecting a connecting portion between the before and Kimakiwaku electrode,
Using a fixing part, fixing the connecting part and the reel, and fixing the connecting part and the electrode,
A method for manufacturing a superconducting coil , wherein the superconducting wire is disposed between the winding frame and the electrode .   The method of manufacturing a superconducting coil according to claim 4, wherein in the connecting step, the connecting portion made of stainless steel is used. The method for manufacturing a superconducting coil according to claim 4 or 5, wherein the winding frame made of stainless steel or an insulating material is used in the winding step.

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