JP2015043364A - Superconducting coil and superconducting coil device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide superconducting coil capable of reducing distortion of superconducting wire, and to provide a superconducting coil device having the superconducting coil.SOLUTION: Superconducting coil 1 comprise: a coil part 11 wound with superconducting wire; an electrode 12; and a leader line 21. The leader line 21 connects the electrode 12 with the superconducting wire of the coil part 11. The leader line 21 comprises: a reinforcement part formed with conductive material; and the superconducting wire.

Description

  The present invention relates to a superconducting coil and a superconducting coil device.

  Japanese Patent Laying-Open No. 2010-98267 (Patent Document 1) discloses an electrode connected to a superconducting coil. The electrode includes a first electrode connected to the superconducting wire of the superconducting coil and a second electrode integrated with the first electrode. Specifically, the first electrode and the second electrode are formed of a copper plate. The first electrode is fixed to the flange at one end side in the circumferential direction of the arc-shaped contact portion extending in the circumferential direction along the terminal portion of the superconducting wire of the superconducting coil and protruded from the flange. And a fixed portion. The second electrode protrudes outward from the flange and has a shape having a connection portion with the power supply cable. The arc-shaped contact portion of the first electrode is soldered to the end portion of the superconducting wire.

JP 2010-98267 A

  For example, when manufacturing a superconducting coil in which an electrode is disposed on the outer peripheral side of the coil, when an external force is applied to the electrode when the coil is not integrated by resin impregnation or the like, the superconducting wire of the coil body (especially the coil body Damage may occur near the connection between the superconducting wire and the electrode. Alternatively, when manufacturing a superconducting coil in which electrodes are arranged on the inner peripheral side of the coil, if loosening occurs when the superconducting wire of the coil body is wound, the superconducting wire of the coil body (particularly the superconducting wire of the coil body) Damage may occur near the connection between the electrode and the electrode.

  Japanese Unexamined Patent Publication No. 2010-98267 discloses a manufacturing method in which a first electrode is connected to a superconducting wire of a superconducting coil, and then the first electrode is fixed to a flange of a bobbin. However, until the electrode is fixed to the flange of the bobbin, it is necessary to handle the superconducting coil so that stress due to its own weight is not applied to the superconducting wire. Therefore, it is difficult to handle the superconducting coil with the structure disclosed in Japanese Patent Application Laid-Open No. 2010-98267.

  As another method, it is conceivable to fix the electrode on the reel and then connect a superconducting wire to the electrode. However, tension may be applied to the superconducting wire in order to connect the superconducting wire to the fixed electrode. Alternatively, it may be necessary to wind a superconducting wire around a fixed electrode. For this reason, in a superconducting wire, distortion may occur in a connection portion with an electrode.

  The objective of this invention is providing the superconducting coil which can reduce the distortion in a superconducting wire, and a superconducting coil apparatus provided with the same.

  A superconducting coil according to an aspect of the present invention includes a coil portion having a wound superconducting wire, an electrode, and a lead wire. The lead wire connects the electrode and the superconducting wire of the coil portion. The lead wire includes a reinforcing portion formed of a conductive material and a superconducting wire.

  A superconducting coil device according to another aspect of the present invention is a superconducting coil device including the above superconducting coil.

  ADVANTAGE OF THE INVENTION According to this invention, the superconducting coil which can reduce the distortion in a superconducting wire, and a superconducting coil apparatus provided with the same can be provided.

1 is a schematic plan view of a superconducting coil 1 according to a first embodiment of the present invention. FIG. 3 is a perspective view for explaining a configuration of a coil unit 11. 3 is a partially enlarged view of a coil unit 11. FIG. FIG. 3 is a diagram schematically showing a cross section of a superconducting wire 14 constituting a coil section 11. 3 is a schematic cross-sectional view showing an example of the configuration of a leader line 21. FIG. It is the schematic explaining the connection between the leader wire 21 and the superconducting wire 14 which comprises the coil part 11 in the superconducting coil 1 which concerns on the 1st Embodiment of this invention. It is a schematic top view of the superconducting coil 2 which concerns on the 2nd Embodiment of this invention. It is the schematic explaining the connection between the lead wire 21 and the superconducting wire 14 which comprises the coil part 11 in the superconducting coil 2 which concerns on the 2nd Embodiment of this invention. It is the figure which showed the structure of the superconducting coil apparatus 101 which concerns on the 3rd Embodiment of this invention.

[Description of Embodiment of Present Invention]
First, embodiments of the present invention will be listed and described.

  (1) The superconducting coil which concerns on embodiment of this invention is provided with the coil part which has the wound superconducting wire, the electrode, and the lead wire which connects the electrode and the superconducting wire of a coil part. The lead wire includes a reinforcing portion formed of a conductive material and a superconducting wire.

  According to the above configuration, the electrode is connected to the lead wire. Since the electrode is not directly connected to the superconducting wire of the coil part, the stress applied to the superconducting wire of the coil part can be reduced by the weight of the electrode. Thereby, the distortion which arises in the superconducting wire of a coil part can be decreased. Furthermore, since the lead wire includes the reinforcing portion, it has a strength higher than the strength of the superconducting wire of the coil portion. Thereby, for example, during the manufacture of the superconducting coil, it is possible to further reduce the possibility of damage near the connecting portion between the electrode and the superconducting wire of the coil portion. Therefore, a superconducting coil excellent in handling can be realized. Moreover, since the reinforcement part is formed with the electroconductive material, the electrical connection between an electrode and the superconducting wire of a coil part is securable.

  (2) It is preferable that the said leader line is arrange | positioned along the outer periphery or inner periphery of the said coil part.

  According to the said structure, the stress applied to the superconducting wire of a coil part can be made small, without enlarging the dimension (for example, outer diameter dimension) of the said coil part significantly.

  (3) It is preferable that the electrode is disposed outside the coil portion, and the lead wire is disposed along the outer periphery of the coil portion over a length of not less than one half and not more than one turn of the coil portion. .

  According to the above configuration, the stress applied to the superconducting wire of the coil portion can be reduced without significantly increasing the size of the coil portion (for example, the outer diameter).

  (4) The electrode is disposed on the inner peripheral side of the coil part, and the lead wire is disposed along the inner periphery of the coil part over a length of not less than a half circumference and not more than one circumference of the coil part. It is preferable.

  According to the above configuration, the stress applied to the superconducting wire of the coil portion can be reduced without significantly increasing the size of the coil portion (for example, the outer diameter).

  (5) It is preferable that the said lead wire is connected to the said edge part from the outer peripheral side of the said coil part with respect to the edge part of the said superconducting wire located in the inner peripheral side of the said coil part.

  According to the said structure, the repulsive force of the bent leader line is made small by enlarging the curvature of a leader line. Thereby, in the superconducting wire of a coil part, the stress added to the part connected with a leader line can be made small.

  (6) It is preferable that the said reinforcement part is a tape which consists of stainless steel, copper, or a copper alloy.

  According to the said structure, the intensity | strength of a leader line can be raised, without increasing the thickness of a leader line significantly. Therefore, it is possible to prevent the dimension (for example, the outer diameter dimension) of the coil portion from significantly increasing.

(7) The thickness of the tape is preferably 10 μm or more and 100 μm or less.
According to the said structure, the intensity | strength of a leader line can be raised, without increasing the thickness of a leader line significantly. Therefore, it is possible to prevent the dimension (for example, the outer diameter dimension) of the coil portion from significantly increasing.

(8) It is preferable that the superconducting wire of the coil portion includes an oxide superconductor.
When the superconducting wire includes an oxide superconductor, the superconducting wire is vulnerable to distortion. When distortion is applied to the oxide superconductor, the oxide superconductor may be damaged. According to the said structure, possibility that a superconducting wire will be damaged can be made small in the edge part of the coil part formed with the superconducting wire comprised with an oxide superconductor.

(9) A superconducting coil device according to an embodiment of the present invention includes the superconducting coil.
According to this configuration, a superconducting coil device including a superconducting coil with little distortion in the superconducting wire can be realized.

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

<Embodiment 1>
FIG. 1 is a schematic plan view of a superconducting coil 1 according to a first embodiment of the present invention. Referring to FIG. 1, superconducting coil 1 has a coil portion 11, an electrode 12, and a lead wire 21.

  The coil portion 11 has a superconducting wire wound in an annular shape along the winding frame 5. The coil unit 11 is a pancake coil such as a single pancake coil or a double pancake coil. The coil contained in the coil part 11 is not limited so that it may be a pancake coil. For example, the coil included in the coil unit 11 may be a racetrack type coil. Alternatively, the coil included in the coil unit 11 may be a solenoid coil in which a superconducting wire is spirally wound.

  The electrode 12 is formed of a copper plate, for example. The shape of the electrode 12 shown in FIG. 1 is a rectangle. However, the shape of the electrode 12 is not particularly limited.

  The lead wire 21 is connected to the electrode 12 and the superconducting wire of the coil portion 11. Leader line 21 includes a superconducting wire. The strength of the lead wire 21 is higher than the strength of the superconducting wire of the coil portion 11. Here, “high strength” means that the rigidity is high (large).

  “Rigidity” can be expressed as a force (load / deformation amount) required to cause unit deformation. “High rigidity (large)” means that the deformation is small relative to the force, and “low rigidity (small)” means that the deformation is large relative to the force.

  Depending on the strength of the lead wire 21, the lead wire 21 can support the electrode 12. By connecting the electrode 12 to the lead wire 21, the distortion in the superconducting wire of the coil part 11 can be reduced.

  FIG. 2 is a perspective view for explaining the configuration of the coil portion 11. FIG. 3 is a partially enlarged view of the coil portion 11. Referring to FIGS. 2 and 3, coil portion 11 is formed by winding oxide-based superconducting wire 14 in an annular shape. The shape of the superconducting wire 14 is a tape shape, in other words, a belt shape.

  FIG. 4 is a diagram schematically showing a cross section of the superconducting wire 14 constituting the coil portion 11. Referring to FIG. 4, superconducting wire 14 has a plurality of superconductors 32a extending in the longitudinal direction, and a sheath portion 32b covering the entire circumference of the plurality of superconductors 32a. The sheath portion 32b is in contact with the superconductor 32a. The material of the sheath portion 32b is, for example, silver or a silver alloy, but is not limited thereto.

  FIG. 5 is a schematic cross-sectional view showing one configuration example of the leader line 21. Referring to FIG. 5, the lead wire 21 includes a plurality of superconductors 32a extending in the longitudinal direction, a sheath portion 32b covering the entire circumference of the plurality of superconductors 32a, and a sheath member 33a covering the sheath portion 32b.

  The material of the sheath member 33a is, for example, stainless steel or copper alloy. Further, the side surface of the sheath portion 32b may be covered with solder 33b or the like as necessary. The lead wire 21 can have higher strength than the superconducting wire 14 by including the sheath member 33a. Further, the sheath member 33a is formed of a conductive material such as stainless steel or copper alloy. Therefore, electrical connection between the electrode 12 and the superconducting wire 14 of the coil portion 11 can be ensured.

  The lead wire 21 shown in FIG. 5 has a configuration in which a sheath member 33a (and solder 33b if necessary) is added to the superconducting wire 14 shown in FIG. That is, in the lead wire 21, the plurality of superconductors 32a and the sheath part 32b correspond to superconducting wires. The sheath member 33a corresponds to a reinforcing portion for reinforcing the superconducting wire.

  The thickness of the sheath member 33a is determined from the viewpoint of the strength of the lead wire 21 and the outer diameter of the coil portion 11. If the sheath member 33a is too thin, it is difficult to sufficiently exhibit the effect of increasing the strength of the lead wire 21 (reinforcing the superconducting wire).

  On the other hand, when the sheath member 33a is thickened, the strength of the lead wire 21 can be increased, but the outer diameter of the coil portion 11 with respect to a predetermined number of turns of the superconducting wire 14 is increased. Conversely, when the outer diameter of the coil part 11 is determined in advance, the number of turns of the coil part 11 is reduced. If the current flowing through the superconducting wire 14 is constant, the electromagnetic force generated by the coil portion 11 decreases as the number of turns of the coil portion 11 decreases. Therefore, in order to obtain an electromagnetic force having a predetermined magnitude, it is necessary to pass a larger amount of current through the superconducting wire 14.

  For this reason, the thickness of the sheath member 33a is determined so as to ensure the necessary strength of the lead wire 21 without significantly increasing the outer diameter of the coil portion 11. In one embodiment, the thickness of the sheath member 33a is in the range of 10 μm or more and 100 μm or less.

  In addition, the lead wire 21 should just have high intensity | strength compared with the superconducting wire 14 which comprises the coil part 11. FIG. Therefore, the configuration of the leader line 21 is not limited as shown in FIG.

  FIG. 6 is a schematic diagram illustrating the connection between the lead wire 21 and the superconducting wire 14 constituting the coil portion 11 in the superconducting coil 1 according to the first embodiment of the present invention. With reference to FIG. 6, the electrode 12 is disposed outside the coil portion 11. The end of the lead wire 21 is connected at the end 30 of the superconducting wire 14 located on the outer peripheral side of the coil portion 11. The lead wire 21 is disposed along the outer periphery of the coil portion 11 over a length of not less than a half circumference and not more than one circumference of the coil portion 11. Note that the reel 5 is omitted in FIG. 6 for easy understanding.

  A lead wire 21 having a strength higher than that of the superconducting wire 14 of the coil part 11 is wound along the outer periphery of the coil part 11 over the half periphery of the coil part 11. Since the leader line 21 has a curvature, the edgewise deformation of the leader line 21 is suppressed. As a result, even if an electrode is attached to the outer peripheral portion of the coil, it is possible to prevent the superconducting wire 14 of the coil portion 11 from being distorted by its own weight.

  In this embodiment, the superconducting wire 14 of the coil part 11 is composed of an oxide superconductor. Superconducting wires composed of oxide superconductors tend to be susceptible to strain. When the superconducting wire is damaged due to distortion, the electric resistance of the superconducting wire increases. Therefore, it is preferable to reduce the stress applied to the superconducting wire 14 as much as possible from the viewpoint of preventing the superconducting wire 14 from being damaged.

  As shown in FIG. 1, the connection point between the lead wire 21 and the superconducting wire 14 of the coil portion 11 is on the line connecting the connection point between the electrode 12 and the lead wire 21 and the center point of the coil portion 11 (FIG. 1). On axis X). Thereby, the stress applied to the superconducting wire 14 at the connection point between the lead wire 21 and the superconducting wire 14 of the coil portion 11 can be reduced.

  Since the lead wire 21 is formed along the outer periphery of the coil portion 11 to be longer than the half circumference of the coil portion 11, the lead wire 21 is connected to the superconducting wire 14 at the connection point between the lead wire 21 and the superconducting wire 14 of the coil portion 11. The applied stress can be reduced.

  On the other hand, the lead wire 21 has a reinforcing portion for increasing the strength of the superconducting wire. When the entire coil part 11 is formed of a reinforced superconducting wire, the dimension (outer diameter dimension) of the coil part 11 increases depending on the thickness of the reinforcing part. Alternatively, in order to regulate the outer diameter of the coil part 11 to a certain size, it is necessary to reduce the number of turns of the coil part 11.

  In this embodiment, the lead wire 21 is disposed along the outer periphery of the coil portion 11 with a length of not less than a half circumference and not more than one circumference of the coil portion 11. Thereby, the stress applied to the superconducting wire 14 can be reduced without significantly increasing the outer diameter of the coil part 11 (or significantly reducing the number of turns of the coil part 11).

  As described above, according to the first embodiment of the present invention, the electrode 12 and the superconducting wire 14 of the coil portion 11 are connected by the reinforced superconducting wire (leader wire 21). Thereby, it can prevent that the stress by the dead weight of the electrode 12 generate | occur | produces in the superconducting wire 14 which comprises the coil part 11. FIG. Therefore, according to the first embodiment, a superconducting coil excellent in handling can be realized.

  In addition, according to 1st Embodiment, the coil part 11 is a circular coil. Therefore, the leader line 21 is formed in an arc shape over its entire length, and the leader line 21 has a predetermined curvature. However, the coil unit 11 is not limited to a circular coil, and may be a racetrack type coil, for example. When the coil part 11 is a racetrack type coil, the leader line 21 should just be curving at least one place. Thereby, since the leader line 21 has a curvature, the edgewise deformation of the leader line 21 is suppressed. As a result, even if an electrode is attached to the outer peripheral portion of the coil, it is possible to suppress the distortion of the superconducting wire of the coil portion 11 due to the weight of the electrode. That is, the leader line 21 does not need to be curved over its entire length. In other words, the leader line 21 should just be curving at least one place.

<Embodiment 2>
FIG. 7 is a schematic plan view of the superconducting coil 2 according to the second embodiment of the present invention. With reference to FIGS. 1 and 7, superconducting coil 2 has a coil portion 11, an electrode 12, and a lead wire 21. The superconducting coil 2 according to the second embodiment differs from the superconducting coil 1 according to the first embodiment in that the electrode 12 and the lead wire 21 are arranged on the inner peripheral portion of the coil portion 11. In addition, as a structure of the leader line 21, the structure shown in FIG. 4 or FIG. 5 is employable. Accordingly, detailed description of the structure of the leader line 21 will not be repeated.

  FIG. 8 is a schematic diagram illustrating the connection between the lead wire 21 and the superconducting wire 14 constituting the coil portion 11 in the superconducting coil 2 according to the second embodiment of the present invention. With reference to FIG. 8, the lead wire 21 is disposed along the inner circumference of the coil portion 11 over a length of not less than a half circumference and not more than one circumference of the coil portion 11. For ease of understanding, the reel 5 is omitted in FIG.

  As in the first embodiment, the connection point between the lead wire 21 and the superconducting wire 14 of the coil portion 11 is a line connecting the connection point between the electrode 12 and the lead wire 21 and the center point of the coil portion 11 ( On axis X in FIG. Thereby, the stress applied to the superconducting wire 14 at the connection point between the lead wire 21 and the superconducting wire 14 of the coil portion 11 can be reduced.

  Leader wire 21 is connected to end portion 30 from the outer peripheral side of coil portion 11 with respect to end portion 30 of superconducting wire 14 located on the inner peripheral side of coil portion 11. Therefore, the lead wire 21 having a higher strength than the superconducting wire 14 of the coil part 11 is wound over a half circumference of the coil 11 part.

  When the end portion of the lead wire 21 is connected to the superconducting wire 14 on the inner peripheral side of the coil portion 11 relative to the end portion 30 on the inner peripheral side of the superconducting wire 14 of the coil portion 11, due to the elasticity of the lead wire 21. When the lead wire 21 is bent, a repulsive force to return to the original shape is generated in the lead wire 21 toward the outer periphery of the coil portion 11. Due to the repulsive force of the lead wire 21, a strong stress may be applied to the connecting portion between the superconducting wire 14 and the lead wire 21.

  Therefore, in this embodiment, the superconducting wire 14 is connected to the outer peripheral side of the coil portion 11 rather than the end portion 30 on the inner peripheral side of the superconducting wire 14 of the coil portion 11. The repulsive force of the leader line 21 is reduced by increasing the curvature of the leader line 21. Thereby, in the superconducting wire 14, the stress added to the part connected with the leader line 21 can be made small.

  As in the first embodiment, the lead wire 21 is arranged along the inner circumference of the coil portion 11 over a half circumference or more and one circumference or less of the coil portion 11. FIG. 7 shows a form in which the lead wire 21 is arranged along the inner circumference of the coil portion 11 over the half circumference of the coil portion 11.

  As described above, according to the second embodiment, similarly to the first embodiment, according to the first embodiment of the present invention, the electrode 12 and the superconducting wire 14 of the coil portion 11 are reinforced superconducting. They are connected by a line (leader line 21). Thereby, it can prevent that the stress by the dead weight of the electrode 12 generate | occur | produces in the superconducting wire 14 which comprises the coil part 11. FIG. Therefore, according to the second embodiment, a superconducting coil excellent in handling can be realized.

<Embodiment 3>
In the third embodiment, a superconducting coil device including the superconducting coil according to the first or second embodiment is disclosed.

  FIG. 10 is a diagram showing a configuration of a superconducting coil device 101 according to the third embodiment of the present invention. Referring to FIG. 10, superconducting coil device 101 has superconducting coil 1 and bobbin 102 for attaching superconducting coil 1. Superconducting coil 1 has a coil portion 11 and electrodes 12a and 12b. The coil unit 11 includes coils 11a to 11h. The axis Ax corresponds to the stacking direction of the coils 11a to 11h.

  The bobbin 102 includes a trunk portion 103 disposed inside the stacked coils 11 a to 11 h, a flange 104 a provided at the upper end of the trunk portion 103, and a flange 104 b provided at the lower end of the trunk portion 103. A cylindrical space (bore) 105 is formed in the body portion 103. As a direct current flows through the superconducting coil device 101, a static magnetic field is generated in the bore 105. When an alternating current flows through the superconducting coil device 101, a dynamic magnetic field is generated in the bore 105.

  The coils 11a to 11h are pancake type coils. An electrode 12a is connected to the uppermost coil 11a. On the other hand, the electrode 12b is connected to the lowermost coil 11h. The electrodes 12a and 12b are drawn from the same side of the coil part 11 (left side of the paper surface in FIG. 9).

  Since the detailed configuration of superconducting coil 1 is the same as the configuration of superconducting coil 1 according to Embodiment 1, the following detailed description will not be repeated. In superconducting coil device 101 shown in FIG. 10, superconducting coil 1 may be replaced with superconducting coil 2 according to the first embodiment.

  The embodiment disclosed this time must be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  1, 2 superconducting coil, 5 reel, 11 coil part, 11a to 11h coil, 12, 12a, 12b electrode, 14 superconducting wire, 21 lead wire, 30 end part, 32a superconductor, 32b sheath part, 33a sheath member, 33b Solder, 101 superconducting coil device, 102 bobbin, 103 trunk, 104a, 104b flange, 105 bore, Ax, X axis.

Claims (9)

A coil portion having a wound superconducting wire;
Electrodes,
A lead wire connecting the electrode and the superconducting wire of the coil portion;
The leader line is
A reinforcing portion formed of a conductive material;
A superconducting coil including a superconducting wire.   The superconducting coil according to claim 1, wherein the lead wire is disposed along an outer periphery or an inner periphery of the coil portion. The electrode is disposed outside the coil portion,
The superconducting coil according to claim 2, wherein the lead wire is disposed along a circumference of the coil portion over a length of not less than a half circumference and not more than one circumference of the coil portion. The electrode is disposed on the inner peripheral side of the coil portion,
3. The superconducting coil according to claim 2, wherein the lead wire is disposed over a length of not less than a half circumference and not more than one circumference of the coil portion along an inner circumference of the coil portion.   The superconducting coil according to claim 4, wherein the lead wire is connected to the end portion from the outer peripheral side of the coil portion with respect to the end portion of the superconducting wire located on the inner peripheral side of the coil portion.   The superconducting coil according to any one of claims 1 to 5, wherein the reinforcing portion is a tape made of stainless steel, copper, or a copper alloy.   The thickness of the said tape is a superconducting coil of Claim 6 which is 10 micrometers or more and 100 micrometers or less.   The superconducting coil according to any one of claims 1 to 7, wherein the superconducting wire of the coil part includes an oxide superconductor.   A superconducting coil device comprising the superconducting coil according to claim 1.

Images