KR101538582B1 - Superconducting coil - Google Patents

Superconducting coil Download PDF

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Publication number
KR101538582B1
KR101538582B1 KR1020140044604A KR20140044604A KR101538582B1 KR 101538582 B1 KR101538582 B1 KR 101538582B1 KR 1020140044604 A KR1020140044604 A KR 1020140044604A KR 20140044604 A KR20140044604 A KR 20140044604A KR 101538582 B1 KR101538582 B1 KR 101538582B1
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KR
South Korea
Prior art keywords
terminal
superconducting
wire
superconducting wire
thermally conductive
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Application number
KR1020140044604A
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Korean (ko)
Inventor
주진홍
이재득
김영춘
김석범
Original Assignee
두산중공업 주식회사
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Priority to KR1020140044604A priority Critical patent/KR101538582B1/en
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Publication of KR101538582B1 publication Critical patent/KR101538582B1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/42—Insulated conductors or cables characterised by their form with arrangements for heat dissipation or conduction
    • H01B7/428—Heat conduction
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F5/00—Coils
    • H01F5/02—Coils wound on non-magnetic supports, e.g. formers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F6/00—Superconducting magnets; Superconducting coils
    • H01F6/04—Cooling
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F6/00—Superconducting magnets; Superconducting coils
    • H01F6/06—Coils, e.g. winding, insulating, terminating or casing arrangements therefor
    • H01F6/065—Feed-through bushings, terminals and joints

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Superconductive Dynamoelectric Machines (AREA)

Abstract

The present invention relates to a superconducting coil. A thermally conductive wire material expanding a heat transfer area and an electrical transmission area is wound around the outside of a superconducting wire material and an outer terminal is installed in the wire material while surrounding an entire outer circumference of the thermally conductive wire material. Therefore, the present invention improves an anti-cooling and an anti-heating performance and eliminates a deviation of a finished size and prevents deformation.

Description

{Superconducting coil}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a superconducting coil, and more particularly, to a superconducting coil in which a superconducting wire is wound in a racetrack shape.

Superconducting coils are made of coils that are electrically operated by winding the superconducting wire several times. Because it is made of superconducting wire, there is no electric resistance, so it can flow large current and can make strong magnetic field. Superconducting wire is to be manufactured a superconducting material such as NbTi, Nb 3 Sn, V 3 Ga as a product of the band-shape thin, the outer surface is coated with an insulating material.

The superconducting coil can be used as a rotor coil of a generator and a motor because a superconducting coil can not pass through a large current and can generate a strong magnetic field because there is no electric resistance as described above. A motor and a generator using a superconducting coil are called superconducting motors and superconducting generators , Which is sometimes referred to as a superconducting rotor.

1, a superconducting coil used in a superconducting motor or a superconducting power generator is formed by winding a superconducting wire 2 on the outer circumferential surface of a bell jar 1 in the form of a race track several times and winding the superconducting wire 2 around the inner end And the terminal members 3 and 4 are connected to the outer end portions, respectively. The terminal members (3,4) are linear or plate-shaped and made of copper.

Therefore, current can be applied to the superconducting coil through the inner / outer terminal members 3 and 4.

A plurality of such superconducting coils are laminated to fabricate a rotor coil assembly for use in a superconducting rotor.

As described above, a prior art in which a current introduction terminal is directly connected to a superconducting wire is disclosed in Korean Patent Laid-Open Publication No. 10-2010-0037983.

On the other hand, the superconducting wire must be smoothly cooled to maintain the superconducting phenomenon. However, since the terminal members (3, 4) for introducing current into the superconducting wire are not superconductors and have resistance, heat is generated by resistance when a large current is energized.

As described above, heat generated in the current introduction portion is transmitted to the superconducting wire to break the superconducting state, so that the superconducting coil does not have normal electromagnetic characteristics or local breakage occurs.

Therefore, the superconducting coils are always required to improve the cooling performance and the heat generation suppressing performance of the current introducing portion.

On the other hand, since the superconducting coil is manufactured by winding the superconducting wire many times, there is a problem that the finished dimension deviates due to the difference in the thickness tolerance of the superconducting wire and the force for winding the superconducting wire.

In addition, the superconducting coil of the above-described shape has a problem in that the superconducting coil is deformed in the outward direction when it is energized.

Such dimensional variations and deformations of the superconducting coils adversely affect performance and mechanical stability during assembly and use of a rotating machine to which a superconducting coil is applied.

Accordingly, the present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to improve the cooling and heating prevention performance of the current introduction part, And it is an object of the present invention to provide a superconducting coil which can always maintain stable superconducting performance.

In order to accomplish the above object, the present invention provides a bobbin, a superconducting wire wound around an outer periphery of a bobbin, and a thermally conductive wire wound around an outer periphery of the superconducting wire wound around the outer end of the superconducting wire.

The inner terminal is joined to the inner end of the superconducting wire.

An outer terminal is provided in the form of wrapping the entire outer periphery of the thermally conductive wire and the outer terminal pressurizes the superconducting wire and the thermally conductive wire to limit the finished dimension of the superconducting wire.

Wherein the thermally conductive wire is a conductor which is not entirely covered with an insulating coating.

The superconducting wire and the thermally conductive wire are joined by soldering.

A terminal mounting portion is formed on the bobbin, an inner terminal is inserted into the terminal mounting portion, and is fixed with a bolt.

The inner terminal and the superconducting wire are joined by soldering.

The outer terminal is composed of a plurality of copper frame members.

The frame member has a flange formed on the upper surface thereof, and the flanges of adjacent frame members can be butted and bolted together.

The frame member is formed with an overlap portion of a half thickness of the frame member in the longitudinal direction of the frame member in the cross section, and the overlap portions of the adjacent frame members are overlapped and bolted together.

As described above, according to the present invention, the copper wire rod is wound on the outer side of the superconducting wire rod, and the entire outer side of the copper wire rod is enclosed by the outer terminal, so that the entire copper wire rod and the outer terminal function as a current lead-in portion.

Accordingly, not only heat generation is suppressed by reducing the resistance of the current introduction portion upon application of current, but also the heat generated at the outer terminal and the copper wire contact portion is rapidly transferred to the refrigerant inside the bobbin through the copper wire and superconducting wire, .

As described above, the superconducting wire can be stably maintained in the superconducting state by improving the cooling and heating suppression performance of the superconducting coil, so that the superconducting coil can always exhibit the electrically stable performance, and the superconducting coil . Further, breakage of the superconducting wire due to local heat generation can be prevented.

On the other hand, since the entire superconducting wire and the copper wire are surrounded by the outer terminal, the completed dimensions of the superconducting coil are always the same, and the corresponding stiffness against the bending stress generated during use is improved. Thus, the superconducting coil is not deformed, The assembling of the rotating machine is facilitated and the structural stability during operation is improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a conventional superconducting coil.
2 is a plan view of a bobbin which is an embodiment of the present invention.
Fig. 3 is a state in which the bobbin is separated from the inner terminal (superconducting wire connecting state).
4 is a view showing a state where a superconducting wire is wound on a bobbin and a copper wire is connected to the superconducting wire.
5 is a view showing a state in which a copper wire is wound around an outer side of a superconducting wire.
6 is a view showing a state where an outer terminal is mounted outside of a copper wire rod;
7 is a view for explaining a coupling structure of an outer terminal;
8 is a view for explaining another embodiment of the outer terminal coupling structure;

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. The thicknesses of the lines and the sizes of the components shown in the accompanying drawings may be exaggerated for clarity and convenience of explanation.

In addition, the terms described below are defined in consideration of the functions of the present invention, and these may vary depending on the intention of the user, the operator, or the precedent. Therefore, definitions of these terms should be made based on the contents throughout this specification.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

The present invention includes a bobbin (10), an inner terminal (20), a superconducting wire (30), a thermally conductive wire (50), and an outer terminal (60).

The bobbin 10 provides a place where the inner terminal 20 is to be mounted and a place where the superconducting wire 30 is to be wound and has an outer circumferential surface in the form of a racetrack as shown in Figure 2, And is formed to have a thickness enough to wind the superconducting wire 30.

A terminal mounting portion 11 is formed at one side of the bobbin 10 at a long side of the bobbin 10 and a terminal mounting portion 11 is formed at a side of the bobbin 10 on which the inner terminal 20 is inserted. And a bolt hole 12 is formed through the through hole.

The inner terminal 20 is a rectangular plate made of copper and has a height protruding upward from the upper surface of the bobbin 10 so as to be connected to another current introducing member.

The thickness of the inner terminal 20 is equal to the depth of the terminal mounting portion 11 formed on the bobbin 10 so that when the inner terminal 20 is inserted into the terminal mounting portion 11, Upward direction).

On the opposite surface of the inner terminal 20 on the side of the terminal mounting portion 11, there are formed bolt holes 21 (not exactly penetrating holes) at positions corresponding to the bolt holes 12. When the inner terminal 20 is inserted into the terminal mounting portion 11, the bolt holes 12 and 21 coincide with each other.

The superconducting wire 30 is connected to one side (outer side surface in the mounted state) of the inner terminal 20 before the inner terminal 20 is inserted into the terminal mounting portion 11.

The portion of the superconducting wire 30 connected to the inner terminal 20 is removed from the insulating covering material and the portion from which the insulating covering material is removed is joined to the inner terminal 20 by soldering.

After the inner terminal 20 in the state where the superconducting wire 30 is bonded as described above is inserted into the terminal mounting portion 11 of the bobbin 10 and then inserted into the inner space of the bobbin 10 from the inner space of the bobbin 10 Is inserted into the bolt hole (12, 21), the inner terminal (20) is mounted on the terminal mounting portion (11). The inner terminal 20 does not protrude to the outer side of the bobbin 10, that is, to the outside of the terminal mount 11 (upward in the figure) as described above, and then the windings of the superconducting wire 30 It can be done smoothly without ruggedness.

The bolt 40 is a dish head bolt and the bolt hole 12 is formed in the same shape so that the head of the bolt 40 in the fastened state does not protrude inward of the bobbin 10.

After the inner terminal 20 is mounted as described above, the superconducting wire 30 is wound on the outer circumferential surface of the bobbin 10 repeatedly a number of times according to the design specification (the separate annular wire rod is wound in the outer direction of the bobbin 10 Layered superconducting wire is repeatedly wound in one piece, which is actually the same for the thermally conductive wire 50 to be described later.

A thermally conductive wire 50 is bonded to an outer end of the superconducting wire 30 wound on the outer side of the bobbin 10. The thermally conductive wire 50 is a tape-shaped conductor which is entirely free of an insulating coating, and can be made of a material having excellent electrical and thermal conductivity such as copper and silver. Particularly when copper is used, it is preferable to use high-purity oxygen-free copper that does not contain oxygen atoms.

The superconducting wire 30 and the thermally conductive wire 50 are bonded together by soldering. It goes without saying that the insulation coating is removed from the portion of the superconducting wire 30 which is joined to the heat conductive wire 50. After the superconducting wire 30 and the thermally conductive wire 50 are bonded to each other, as shown in Fig. 5, the thermally conductive wire 50 is wrapped around the outer periphery of the superconducting wire 30 a plurality of times according to design specifications.

After the winding of the thermally conductive wire 50 is completed, the outer terminal 60 is mounted to the outside of the wound thermally conductive wire 50 as shown in Fig.

The outer terminal 60 is made of the same copper material as that of the inner terminal 20 and is composed of a frame member 61 in which the entirety of the race track is divided into a plurality of portions. 6 shows a case where the J-shaped frame member 61 divided into four parts of the entire outer terminal 60 is used. However, the present invention is not limited to this, and the winding state of the superconducting wire 30 and the thermally conductive wire 50 can be stably So that the fastening state can be maintained stably with mutual cooperation. For example, it is possible to manufacture the frame member in the form of dividing the race track shape into two horizontally or vertically. Considering the convenience of assembly, it is not desirable to divide into too many parts.

The frame member 61 can be fastened in the following manner. A flange 61a protruding upward from the upper surface of the frame member 61 is formed at an end of the frame member 61 and a bolt hole is formed at the center of the flange 61a. Therefore, the flanges 61a on both sides of the frame members 61 adjacent to each other are brought into contact with each other and the both flanges 61a are fastened with the bolts 63 and the nuts 64. When the frame members 61 are all bonded to the outer circumferential portion of the thermally conductive wire 50 in this manner, the inner circumferential surface of the frame member 61 and the outer circumferential surface of the thermally conductive wire member 50 are strongly tightly contacted by the binding force of the frame members 61 The state of winding of the superconducting wire 30 and the thermally conductive wire 50 is stably maintained and the thermally conductive wire 50 and the frame member 61 are electrically connected.

The entirety of the frame members 61 bound as described above acts as the outer terminal 60. As will be described later, the entire outer terminal 60 and the thermally conductive wire 50 act as a current introduction portion of the superconducting wire 30.

Meanwhile, the frame members 61 may be bound together in the same manner as in FIG. As shown in Fig. 8, overlapping portions 61b and 61c corresponding to half the thickness of the frame member 61 are formed at the end of the frame member 61 in parallel with the longitudinal direction of the frame member 61. As shown in Fig. The overlapping portions 61b and 61c of the frame members 61 to be coupled to each other are formed opposite to each other in the thickness of the frame member 61 and the frame member 61 is formed when the two overlapping portions 61b and 61c are overlapped with each other, Of the body portion. A bolt hole 62 penetrating the bolt hole 62 is formed in the overlapping portions 61b and 61c and a nut 66 is fastened to the bolt 65 inserted in the bolt hole 62, So that the frame members 61 are firmly connected to each other.

The pressing force is applied to the thermally conductive wire 50 by the size of the inner periphery of the outer terminal 60 in a state in which the binding of the frame members 61 is completed so that the superconducting wire 30 and the thermally conductive wire 50, And the electrically connected state of the outer terminal 60 and the thermally conductive wire 50 is stably maintained.

Hereinafter, the operation and effect of the present invention will be described.

In the superconducting coil, current is applied to the inner terminal 20 and the outer terminal 60, so that the superconducting wire 30 is energized through the thermally conductive wire 50. At this time, a portion of interest for suppressing cooling and heat generation is an outer end portion of the superconducting wire 30 remote from the inside of the bobbin 10.

The superconducting wire 30 is cooled to a temperature lower than a critical temperature at which the superconducting wire 30 is caused by the cryogenic coolant acting inside the bobbin 10 before the energization state and the resistance of the superconducting wire 30 is zero And the superconducting coil can form a strong magnetic field as desired.

The superconducting wire of the present invention has the effect of increasing the heat transfer area and the energizing area by winding the thermally conductive wire 50 between the superconducting wire 30 and the outer terminal 60 a plurality of times.

The heat transfer area is increased by the thermally conductive wire 50 so that the electrical resistance heat generated in the entire outer terminal 60 and the thermally conductive wire 50 is quickly transferred to the cryogenic part inside the bobbin 10, The connection of the wire member 50 is smoothly cooled. Further, the heat conduction performance of the superconducting coil is improved by the heat conduction wire 50 and the outer terminal 60, which also facilitates the cooling of the junction between the superconducting wire 30 and the heat conduction wire 50.

The temperature of the superconducting wire 30 is locally increased due to smooth cooling of the connection portion between the superconducting wire 30 and the superconducting wire 50. As a result, The superconducting coils can be normally operated. In addition, since the local temperature rise of the superconducting wire 30 does not occur, breakage of the superconducting wire 30 is prevented.

In addition, since the thermally conductive wire 50 and the outer terminal 60 surrounding the thermally conductive wire 50 function as a current-introducing portion, the electrical resistance of the current-introducing portion is greatly reduced, and the amount of heat generated by the electrical resistance is reduced. This also helps to prevent the temperature of the connecting portion between the superconducting wire 30 and the thermally conductive wire 50 from rising locally, thereby maintaining the superconducting state of the superconducting wire 30 stably, do.

Meanwhile, in the superconducting coil according to the present invention, the completed dimensions are determined by the binding of the frame members 61 surrounding the thermally conductive wire 50. The dimensions of the outer terminals 60 formed by mutually coupling the frame members 61 are always the same, so that the finished dimensions of the superconducting coils are always the same. That is, the deviation of the dimension that can be generated by winding the superconducting wire 30 and the heat conductive wire 50 in multiple layers is limited to a certain value by the outer terminal 60 so that the finished dimension of the superconducting coil does not vary do.

As described above, since the dimension of the superconducting coil is always constant, it is easy to assemble the superconducting rotor using the superconducting coil, and the assembled superconducting rotor is structurally stable, thereby ensuring the stability of operation.

In addition, since the superconducting wire 30 and the thermally conductive wire 50 are kept tightly held by the outer terminal 60, the thermal conductivity and the conductivity of the wires can be improved and the bending deformation of the superconducting coil can be suppressed .

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It is understandable. Accordingly, the true scope of the present invention should be determined by the following claims.

10: Bobbin 11: Terminal mounting part
12: bolt hole 20: inner terminal
21: Bolt hole 30: Superconducting wire
40: bolt 50: thermoconductive wire
60: outer terminal 61: frame member
61a: flange 61b, 61c:

Claims (10)

A bobbin having a terminal mounting portion formed to be inserted into one long side;
A superconducting wire wound around an outer periphery of the bobbin;
An inner terminal inserted into the terminal mounting portion and installed to be connected to an inner end of the superconducting wire; And
And a heat conductive wire connected to an outer end of the superconducting wire and wound around the outer circumference of the superconducting wire,
Wherein a thickness of the inner terminal is equal to a depth of the terminal mounting portion. The method according to claim 1,
Wherein the bobbin includes a plurality of bolt holes formed at predetermined intervals along the terminal mounting portion,
Wherein the inner terminal includes a plurality of bolt holes formed to correspond to the number and position of the plurality of bolt holes on the side surface facing the terminal mounting portion,
And the inner terminal is fixed to the terminal mounting portion of the bobbin by a bolt. 3. The method of claim 2,
An outer terminal is provided in a form to surround the entire outer circumference of the thermally conductive wire,
Wherein the outer terminal presses the superconducting wire and the thermally conductive wire to limit the finished dimension of the superconducting coil. The method of claim 3,
Wherein the thermally conductive wire is a conductor that is not entirely insulated. The method of claim 3,
Wherein the superconducting wire and the thermally conductive wire are joined by soldering. The method of claim 3,
Wherein the inner terminal and the superconducting wire are joined by soldering. The method of claim 3,
Wherein the outer terminal comprises a plurality of copper frame members. 8. The method of claim 7,
Wherein the frame member has a flange formed on an upper surface thereof, and flanges of adjacent frame members are butted and bolted together. 8. The method of claim 7,
Wherein the frame member is formed with an overlap portion of a half thickness of the frame member in the longitudinal direction of the frame member in a cross section and the overlap portions of the adjacent frame members are overlapped and then bolted together.

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KR1020140044604A 2014-04-15 2014-04-15 Superconducting coil KR101538582B1 (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002170709A (en) * 2000-11-30 2002-06-14 Showa Electric Wire & Cable Co Ltd Leadless coil
JP2009049033A (en) * 2007-08-13 2009-03-05 Sumitomo Electric Ind Ltd Race-track type superconducting coil

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002170709A (en) * 2000-11-30 2002-06-14 Showa Electric Wire & Cable Co Ltd Leadless coil
JP2009049033A (en) * 2007-08-13 2009-03-05 Sumitomo Electric Ind Ltd Race-track type superconducting coil

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