WO2018080081A1

WO2018080081A1 - Double pancake coil including reinforced superconductor

Info

Publication number: WO2018080081A1
Application number: PCT/KR2017/011456
Authority: WO
Inventors: 손명환; 김해종; 성기철; 심기덕; 엄범용
Original assignee: 한국전기연구원
Priority date: 2016-10-24
Filing date: 2017-10-17
Publication date: 2018-05-03
Also published as: KR102516873B1; KR20180044557A

Abstract

The present invention relates to a double pancake coil including reinforced superconductor and comprises, as a technical gist, a bobbin; a first coil formed by a high temperature superconductor wound on the bobbin; a second coil laminated together with the first coil and formed by a high temperature superconductor wound on the bobbin; and a reinforced superconductor interposed between the bobbin and the first and the second coil. Therefore, the reinforced superconductor is interposed between the bobbin and the high temperature superconductor to allow a current flowing from the high temperature superconductor to bypass the coil at the time of quenching of the high temperature superconductor innermostly wound on the bobbin, so as to prevent damage to the coil.

Description

Double Pancake Coil with Reinforced Superconducting Wire

The present invention relates to a double pancake coil including a reinforcement superconducting wire, and more particularly, from a high temperature superconducting wire during quench of a high temperature superconducting wire wound inside the bobbin by interposing the reinforcing superconducting wire between the bobbin and the high temperature superconducting wire. The present invention relates to a double pancake coil including a reinforced superconducting wire that can bypass a current flowing therein and prevent damage to the coil.

Superconducting wire means a material with zero electrical resistance of the object, and the liquid nitrogen temperature is higher than that of liquid helium at low temperature superconductor (LTS) and liquid helium near 4K, the liquid helium temperature. The material exhibiting superconductivity at 77K is referred to as a high temperature superconductor (HTS). Since superconducting wires exhibit high critical temperatures, critical current densities and critical magnetic fields, they are expected to be applied to power devices such as superconducting magnets, superconducting cables, superconducting motors or superconducting generators. Among them, a superconducting magnet using a high temperature superconducting wire is mainly formed in a pancake shape by winding a high temperature superconducting wire in a thin tape shape.

Among the pancake-shaped coils, the double pancake coil has a high-temperature superconducting wire wound around one layer and two layers in a mutually opposite direction, and the one- and two-layer winding bands are formed in the same cylindrical shape or racetrack type as necessary. . In the case of a double pancake coil formed of a plurality of layers as described above, when a problem occurs in which a current of more than a quench or a critical current flows, the high temperature superconducting wire may be damaged. In order to prevent such a problem, the current flowing in the corresponding area must be transferred to another high temperature superconducting wire region to prevent the problem of damage to the high temperature superconducting wire. Therefore, in the case of the double pancake coil according to the prior art, as shown in FIG. 1, a joint is formed to connect the plurality of layers to each other, and when the quench is quenched, a current is transmitted from the corresponding coil to another coil layer through the joint 1. It serves to deliver. In general, the joint 1 has a structure in which an oxygen-free copper block having a small electrical resistance is installed, and a structure existing only at the outermost turn of the superconducting coil.

As described above, in the case of a double pancake coil formed of a plurality of layers, one layer and two layers are wound in opposite directions by using one high temperature superconducting wire. 2, the high temperature superconducting wire 3 is arranged diagonally. The high temperature superconducting wire 3 disposed in such a manner may exist in a region not included in the region in which the coil is wound. If a quench occurs in this region, current may not be transferred to another region, resulting in a problem of damage to the superconducting coil. Can be. In particular, the superconducting coil has the largest bending degree of the innermost high temperature superconducting wire (3), so the quench occurs most frequently in this region, and the solution for this is not clearly known at present.

Accordingly, an object of the present invention is to prevent the damage to the coil by bypassing the current flowing from the high temperature superconducting wire when quenching the high temperature superconducting wire wound on the innermost side of the bobbin by interposing the reinforced superconducting wire between the bobbin and the high temperature superconducting wire. It is to provide a double pancake coil containing a reinforced superconducting wire.

The above object is a bobbin; A first coil formed by winding a high temperature superconducting wire on the bobbin; A second coil laminated with the first coil and formed by winding a high temperature superconducting wire on the bobbin; It is achieved by a double pancake coil containing a reinforcing superconducting wire, characterized in that it comprises a reinforcing superconducting wire interposed between the bobbin and the first coil and the second coil.

Here, the first coil and the second coil, the central region is wound diagonally to the bobbin, the first coil and the second coil is wound separately from one high temperature superconducting wire, the reinforcement superconducting wire is oblique It is preferable to be interposed along the region of the high temperature superconducting wire wound around the bobbin, and the bobbin is preferably formed with a reinforcing groove recessed to arrange the reinforcing superconducting wire.

The reinforcing metal may include a reinforcing metal made of a soft metal material to fill a gap formed between the high temperature superconducting wire and the reinforcing superconducting wire. The reinforcing metal may include indium (In), copper (Cu), and aluminum (Al). , Zinc (Zn), lead (Pb), silver (Ag), tin (Sn), bismuth (Bi), gallium (Ga), thallium (Tl), and mixtures thereof.

The first coil and the second coil include an insulated wire wound along with the high temperature superconducting wire to be disposed between the turn-turns of the high temperature superconducting wire, wherein the insulated wire is fixed to the bobbin at an end thereof. Preferably, the winding is performed, and the reinforced superconducting wire is preferably interposed in a bobbin region in which the insulated wire is not wound.

In addition, the insulated wire is electrically conductive, but has a higher resistance or lower electrical conductivity than the surface material of the high temperature superconducting wire, stainless steel, brass, hastelloy, and a mixture thereof. It is preferably selected from.

According to the configuration of the present invention described above it is possible to bypass the current flowing from the high temperature superconducting wire when quenching the high temperature superconducting wire wound on the innermost side of the bobbin by interposing the reinforced superconducting wire between the bobbin and the high temperature superconducting wire to damage the coil. You can prevent it.

1 and 2 are perspective views of a high temperature superconducting wire wound on a bobbin according to the prior art,

3 to 5 is a perspective view of a double pancake coil according to an embodiment of the present invention,

6 is an explanatory view showing the arrangement of the high temperature superconducting wire and the reinforced superconducting wire;

7 is a perspective view of a bobbin including a reinforcement groove,

8 is a perspective view of a double pancake coil wound together with an insulated wire.

Hereinafter, a double pancake coil including a reinforced superconducting wire material according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIGS. 3 to 5, the double pancake coil 10 includes a bobbin 100, a first coil 310, a second coil 330, and a reinforced superconducting wire 500. The bobbin 100 serves as a pillar in which the high temperature superconducting wire 300 is wound, and the high temperature superconducting wire 300 is wound in two layers to form the first coil 310 and the second coil 330. It is preferable that the height of the high temperature superconducting wire 300 is made 2 times or more.

The double pancake coil 10 of the present invention is not limited in shape, such as a circular coil, a square coil, a racetrack coil, and the like, and can be applied wherever the double pancake coil is formed.

The bobbin 100 is provided with a first coil 310 and a second coil 330 formed by winding the high temperature superconducting wire 300. The first coil 310 and the second coil 330 are formed by winding the high temperature superconducting wire 300 on the bobbin 100 so as to be stacked on each other. In this case, the first coil 310 and the second coil 330 may form the first coil 310 and the second coil 330 stacked in two layers from one high temperature superconducting wire 300. That is, one high-temperature superconducting wire 300 has a central region wound in oblique lines on the bobbin 100 so that one end of the region wound in diagonal lines is wound on the upper region of the bobbin 100 to form a first coil 310. The other end of the region wound in a diagonal line may be wound around the lower region of the bobbin 100 so as to form a second coil 330 so as to be distinguished from each other. In this case, the winding directions of the first coil 310 and the second coil 330 are opposite to each other.

As such, in order to form two

coils

310 and 330 from one high temperature superconducting wire 300, there is an area in which the high temperature superconducting wire 300 is diagonally wound, and this area is the first coil 310. When the second coil 330 is spaced apart from each other, the center region is not wound with the other high temperature superconducting wire 300 along the winding direction, so that the contact between the turn-turns is not made. Therefore, if quench occurs in the region of the high temperature superconducting wire 300 that is not made contact between the turns, the current cannot be transmitted to the region of the other high temperature superconducting wire 300 or the metal wire, so that the region of the high temperature superconducting wire 300 This damaging problem can occur. In particular, since the strength of the magnetic field experienced by the high temperature superconducting wire 300 wound on the innermost side of the bobbin 100 is large, the quench is most generated in this region. Therefore, as shown in Figure 6 includes a reinforced superconducting wire 500 to deliver a current during the quench of the high-temperature superconducting wire 300 wound diagonally.

The reinforcement superconducting wire 500 is interposed between the bobbin 100 and the first coil 310 and the second coil 330 to bypass the current at the time of quenching the high temperature superconducting wire 300 to receive and flow the high temperature superconducting wire. The problem that the 300 is damaged can be prevented. At this time, the reinforcement superconducting wire 500 is preferably interposed along the region of the high temperature superconducting wire 300 wound diagonally. As such, the reinforcement superconducting wires 500 interposed between the bobbin 100 and the high temperature superconducting wires 300 may be formed by a section overlapping with the high temperature superconducting wires 300. May occur to induce quench of the high temperature superconducting wire (300). Therefore, to prevent this, a reinforcing metal is included to fill a gap formed between the high temperature superconducting wire 300 and the reinforcing superconducting wire 500. Here, the reinforcing metal is preferably made of a soft metal material to fill the gap. The reinforcing metal made of the soft metal material is indium (In), copper (Cu), aluminum (Al), zinc (Zn), and lead (Pb). ), Silver (Ag), tin (Sn), bismuth (Bi), gallium (Ga), thallium (Tl) and mixtures thereof.

The reinforcement superconducting wire 500 may be interposed to surround the entire circumference of the bobbin 100, and may be interposed to surround only a portion of the bobbin 100 as necessary. When the reinforcement superconducting wire 500 surrounds the entire bobbin, there is no particular problem, but when the reinforcing superconducting wire 500 surrounds only a part of the bobbin 100, the intervening area and the intervening reinforcing superconducting wire 500 are interposed. A jaw may occur between areas that are not. In this case, there may be a mechanical problem, and for this purpose, as shown in FIG. 7, the reinforcement groove 110 recessed so that the reinforcement superconducting wire 500 may be disposed may be formed in the bobbin 100. The reinforcement groove 110 may be formed to have the same or similar width as that of the reinforcement superconducting wire 500 so that the reinforcement superconducting wire 500 may be stably seated in the reinforcing groove. Such a reinforcement groove 110 does not generate a separate jaw, and can stably contact the high temperature superconducting wire 500 to bypass current.

In the case of the double pancake coil 10, the coil 10 may be formed using only the high temperature superconducting wire 300, but as shown in FIG. 8, the insulating wire 700 may be wound together. That is, the first coil 310 and the second coil 330 include an insulated wire 700 wound together with the high temperature superconducting wire 300 so as to be disposed between the turn-turns of the high temperature superconducting wire 300. 700 is wound in the state that the end is fixed to the bobbin 100. The insulated wire 700 is wound around the bobbin 100 while the end is fixed to the bobbin 100 and is wound together with the high temperature superconducting wire 300 to be insulated between the turn-turns of the high temperature superconducting wire 300. 700 is disposed in a structure. The insulated wire 700 fixed to the bobbin 100 is wound from the innermost side of the bobbin, whereby the reinforcement superconducting wire 500 should be interposed in the bobbin 100 area where the insulated wire 700 is not wound. . That is, when the insulating wire 700 starts to be wound together with the high temperature superconducting wire 300, since the high temperature superconducting wire 300 is wound inside the bobbin than the insulating wire 700, the high temperature superconducting wire is not wound. It is preferable to wind the reinforcement superconducting wire 500 in the region in which the wire 300 is wound. Here, the insulated wire 700 may be electrically conductive, but may be made of stainless steel, brass, hastelloy, and a mixture thereof having higher resistance or lower electrical conductivity than the surface material of the high temperature superconducting wire 300. It is most preferred to use a metal insulated wire material selected from the group consisting of, but is not limited thereto.

Conventionally, when a double pancake coil is manufactured, a joint for current bypass exists only at the outermost side of the coil, and a structure capable of bypassing current when quenching the high temperature superconducting wire diagonally disposed at the innermost side of the bobbin does not exist. Did. Therefore, in the present invention, the superheated superconducting wire 300 at the time of quenching the superheated superconducting wire 300 wound inside the bobbin 100 by interposing the reinforced superconducting wire 500 between the bobbin 100 and the high temperature superconducting wire 300. By passing the current flowing from the () can be bypassed to prevent damage to the coil (10).

Claims

Bobbin;

A first coil formed by winding a high temperature superconducting wire on the bobbin;

A second coil laminated with the first coil and formed by winding a high temperature superconducting wire on the bobbin;

And a reinforcement superconducting wire material interposed between the bobbin and the first coil and the second coil.
The method of claim 1,

The first coil and the second coil,

A central area is wound diagonally on the bobbin so that the first coil and the second coil are wound separately from one high temperature superconducting wire,

The reinforcement superconducting wire is a double pancake coil including a reinforcing superconducting wire, characterized in that interposed along the high-temperature superconducting wire region wound in a diagonal line.
The method of claim 1,

The bobbin is a double pancake coil containing a reinforcement superconducting wire, characterized in that the reinforcement groove is formed so that the reinforcement superconducting wire is disposed.
The method of claim 1,

Reinforced superconducting wire comprising a double pancake coil, characterized in that it comprises a reinforcing metal made of a soft metal material for filling the gap formed between the high temperature superconducting wire and the reinforcing superconducting wire.
The method of claim 4, wherein

The reinforcing metal is,

Indium (In), copper (Cu), aluminum (Al), zinc (Zn), lead (Pb), silver (Ag), tin (Sn), bismuth (Bi), gallium (Ga), thallium (Tl) and Double pancake coil with reinforcing superconducting wire, characterized in that selected from the group consisting of a mixture thereof.
The method of claim 1,

The first coil and the second coil,

It includes an insulated wire wound with the high temperature superconducting wire to be disposed between the turn-turn of the high temperature superconducting wire,

The insulated wire is a double pancake coil containing a reinforcement superconducting wire, characterized in that the end is fixed to the bobbin is fixed.
The method of claim 6,

The reinforcement superconducting wire is a double pancake coil including a reinforcing superconducting wire, characterized in that interposed in the bobbin region in which the insulated wire is not wound.
The method of claim 6,

The insulated wire is electrically conductive but selected from the group consisting of stainless steel, brass, hastelloy, and mixtures thereof, which have higher resistance or lower electrical conductivity than the surface material of the high temperature superconducting wire. Double pancake coil with reinforced superconducting wire, characterized in that the.