KR101501478B1 - Superconducting coil assembly, manufacturing method thereof, and rotor of superconducting rorating machine having the same - Google Patents

Abstract

There is provided a superconducting coil assembly for improving the winding structure and method of a superconducting coil wound on a bobbin to reduce the peeling phenomenon of the superconducting wire. The superconducting coil assembly includes a bobbin, a superconducting coil formed by winding a superconducting wire around the bobbin, an upper bobbin plate disposed on top of the superconducting coil, a lower bobbin plate disposed below the superconducting coil, And a second adhesive layer provided on the second adhesive layer.

Description

TECHNICAL FIELD [0001] The present invention relates to a superconducting coil assembly, a superconducting coil assembly, a method of manufacturing the superconducting coil assembly, and a rotor of the superconducting rotating machine having the superconducting coil assembly.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a superconducting coil assembly for preventing peeling of a superconducting wire of a superconducting coil, a method of manufacturing the same, and a rotor of a superconducting rotating machine having the same.

The high-temperature superconducting coil is usually manufactured by winding a tape-shaped high-temperature superconducting wire. Generally, the wound superconducting wire is impregnated with a resin such as an epoxy resin in order to maintain the winding shape or improve the thermoelectric effect in vacuum.

Recently, what is called a second generation wire rod has been produced as a high-temperature superconducting wire rod. The second-generation wire can be produced by forming an intermediate layer of cerium oxide or the like on a tape-like metal substrate such as Hastelloy (registered trademark), and forming an oxide such as a titanium oxide Thereby forming a superconducting layer.

However, in the second generation wire, the oxide superconducting layer or the intermediate layer is liable to be peeled off from the surrounding layer, and the superconducting characteristic is deteriorated by this peeling.

Conventionally, a wet-winding method is used as an epoxy impregnation method for superconducting coils. The wet-wire winding method is a method of inserting a thin capstan tape between the wire rod and the wire rod for insulation between the superconducting wire rods, hardening the wire rope and tightening the heat-resistant epoxy to reduce the thermal resistance between the wire rod and the wire rod.

That is, the superconducting coils wound with the epoxy resin interposed between the wound superconducting wires are held.

When the wet-type winding method is used as described above, there is a high possibility that the superconducting coil is peeled off due to the difference in heat shrinkage ratio between the superconducting wire and the epoxy.

Also, when the wet winding method is used, the working time at the time of winding is longer than the available time of the epoxy (the time until the epoxy is exposed to the air and becomes unusable), and the viscosity increases.

The unevenness of the viscosity causes a problem that the thickness of the epoxy resin in the coil is uneven and the critical current characteristic is lowered.

In addition, when the wet-type winding method is used, there is a problem that conduction cooling between the superconducting wire is not performed well.

It is an object of the present invention to provide a superconducting coil assembly for improving the application position of an epoxy resin that holds a coiled superconducting coil to reduce the peeling phenomenon due to a difference in heat shrinkage ratio between the material of the superconducting wire and the epoxy resin, And to provide a rotor of a superconducting rotating machine having the same.

Another object of the present invention is to provide a superconducting coil assembly for improving workability by improving the method of winding superconducting wire, a method for manufacturing the superconducting coil assembly, and a rotor of the superconducting rotating machine having the same.

According to an aspect of the present invention, there is provided a bobbin, a superconducting coil formed by winding a superconducting wire around the bobbin, an upper bobbin plate disposed on the superconducting coil, There is provided a superconducting coil assembly including a lower bobbin plate and a first adhesive layer provided on at least one of upper and lower sides of the superconducting coil.

The first adhesive layer may include an epoxy.

The superconducting coil may further include a reinforcing band provided on an outer periphery of the superconducting coil, and the reinforcing band may include a glass composite.

And a second adhesive layer provided between the reinforcing strip and the superconducting coil.

According to another aspect of the present invention, there is provided a rotor of a superconducting rotating machine having a superconducting coil assembly as described above.

According to another aspect of the present invention, there is provided a method of manufacturing a superconducting coil, comprising the steps of forming a superconducting coil by winding a superconducting wire around a bobbin, applying an adhesive to at least one of an upper portion and a lower portion of the superconducting coil, And coupling the upper bobbin plate and the lower bobbin plate to the upper and lower portions of the superconducting coil at a lower portion thereof.

The adhesive may include an epoxy resin.

The method may further include joining a reinforcing band around the superconducting coil, wherein the reinforcing band may include a glass composite.

The reinforcing strip may be bonded to the periphery of the superconducting coil by an adhesive, and the adhesive may include an epoxy resin.

According to the present invention, there is an advantage that the conduction cooling method can be used without decreasing the critical current by reducing the peeling phenomenon between the superconducting wires constituting the superconducting coil by applying epoxy to the top and / or bottom of the superconducting coil.

According to the present invention, since the upper and / or lower portions of the wound superconducting coil are coated with epoxy to maintain the shape of the wound superconducting coil, there is an advantage of improving the workability of the winding.

According to the present invention, it is possible to prevent the non-uniformity of the epoxy thickness by reducing the change in viscosity by reducing the available time of the epoxy by applying the epoxy on the upper and / or lower portions of the wound superconducting coil.

1 is a diagram showing a configuration of a superconducting rotating device according to an embodiment of the present invention.
2 is a perspective view illustrating a configuration of a rotor coil assembly according to an embodiment of the present invention.
3 is an exploded perspective view of a rotor coil assembly in accordance with one embodiment of the present invention.
4 is a cross-sectional view taken along the line IV-IV in FIG.
5 is a flowchart illustrating a method of manufacturing a superconducting coil assembly according to an embodiment of the present invention.
6 is a graph showing current-voltage characteristics of a superconducting coil according to the related art.
7 is a graph showing current-voltage characteristics of a superconducting coil according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It will be apparent to those skilled in the art that the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, It is provided to let you know.

1 is a diagram showing a configuration of a superconducting rotating device according to an embodiment of the present invention.

1, the superconducting rotating device 1 includes an outer housing 3, a stator coil 5 installed in the outer housing 3, and a rotor 6 located inside the outer housing 3 and surrounded by a stator coil 5 Electron < / RTI >

The rotor 10 has a vacuum housing 11 and a superconducting coil assembly 100 rotatably supported by an outer housing 3 about a rotating shaft A by a bearing 7, And a coil supporting portion 15 which is supported, for example, by a hollow cylindrical torque transmission support member 13 therein.

The coil support portion 15 includes a central cavity 17 disposed concentrically with the rotation center axis A and extending along the rotation center axis A direction. The cavity 17 may have a cylindrical shape. The cavity (17) is held in a vacuum state by the coil support (15). One side of the rotor (10) is supported on the outer housing (3) by a rotary shaft (19).

The cavity 17 communicates with a cooling device (not shown) through the cooling line 18 so that the condensed refrigerant condensed by using the cryogenic temperature of the cooling device is supplied into the cavity 17 and the condensed refrigerant supplied into the cavity 17 Evaporated and recycled back to the chiller and re-condensed.

The superconducting coil assembly 100 includes a superconducting coil 130 formed by winding a superconducting wire around a bobbin 110. The superconducting coil 130 having such a configuration is installed in the coil support portion 15 of the rotor 10 to be rotated. Therefore, the superconducting coil 130 is required to have sufficient mechanical rigidity to withstand the rotating operation of the rotor 10.

In addition, it is required to maintain the superconducting state of the superconducting coil 130 stably and to improve the cryogenic cooling performance in order to solve the failure characteristics such as the quench.

 Hereinafter, the technical structure for improving the mechanical stiffness and conduction cooling of the superconducting coil will be described in detail by improving the winding method of the superconducting wire.

FIG. 2 is a perspective view illustrating a configuration of a rotor coil assembly according to one embodiment of the present invention, and FIG. 3 is an exploded perspective view of a rotor coil assembly according to an embodiment of the present invention.

2 and 3, the superconducting coil assembly 100 includes a bobbin 110, a superconducting coil 130 formed by winding a superconducting wire 131 around the bobbin 110, And an upper bobbin plate 150 and a lower bobbin plate 170 provided at a lower portion thereof.

The superconducting wire 131 has a rectangular cross section.

The bobbin 110 has a shape such as a field track having a straight section and a curved section such that the superconducting wire 131 does not excessively bend when it is wound.

The superconducting wire 130 is wound around the bobbin 110 so that the superconducting coil 130 has the same track shape as the outer shape of the bobbin 110. [

The upper bobbin plate 150 and the lower bobbin plate 170 may be made of a metal having high thermal conductivity, such as copper or aluminum.

The bobbin 110, the upper bobbin plate 150 and the lower bobbin plate 170 may be formed so that the central portion of the bobbin 110, the lower bobbin plate 150, and the lower bobbin plate 170 penetrate therethrough for engagement with the coil support portion 15 of the rotor 10.

A first adhesive layer 180 may be further provided between the upper bobbin plate 150 and the upper portion of the superconducting coil 130 and / or the lower portion of the lower bobbin plate 170 and the lower portion of the superconducting coil 130. The first adhesive layer 180 may include an epoxy which is a heat-crystallizable adhesive.

The bobbin 110 may be configured to have a width slightly larger than the width of the superconducting wire 131 in consideration of the coating thickness of the first adhesive layer 180.

A reinforcing band 160 may be additionally provided around the wound superconducting coil 130. The reinforcing strip 160 may be composed of, for example, a G10 glass composite excellent in mechanical strength and insulation.

The reinforcing band 160 is coupled to the superconducting coil 130 by the second adhesive layer 190 applied between the superconducting coil 130 and the reinforcing band 160 to electrically insulate the superconducting coil 130, 130 are reinforced so that they are not damaged by the rotational force.

The reinforcing band 160 may be provided on both sides of the linear section of the superconducting coil 130 in consideration of workability and generation of a magnetic field at both sides of the superconducting coil 130.

The through holes 111, 151 and 171 may be formed in the center of the bobbin 110 and the upper and lower bobbin plates 150 and 170 so as to be inserted into the protrusions of the coil support 150 of the rotor 10.

4 is a cross-sectional view taken along the line IV-IV in FIG.

Referring to FIG. 4, a first adhesive layer 180 including epoxy is applied to the top and / or bottom of the superconducting coil 130 to maintain the winding shape of the superconducting coil 130. The first adhesive layer 180 may be applied to both the upper and lower sides of the superconducting coil 130 as shown in FIG.

Alternatively, the superconducting coil 130 can be applied only to either the upper side or the lower side of the superconducting coil 130.

As described above, the epoxy bonding layer 180 is formed on the upper portion and / or the lower portion of the superconducting coil 130 without interposing the epoxy between the superconducting wires 131, thereby reducing the peeling phenomenon between the superconducting wires 131. As a result, the conduction cooling method can be used without decreasing the critical current.

5 is a flowchart illustrating a method of manufacturing a superconducting coil assembly according to an embodiment of the present invention.

4 and 5, a method of manufacturing a superconducting coil assembly includes a superconducting wire winding step S10, an adhesive applying step S30, and an upper and lower bobbin plate coupling step S50.

In the superconducting wire winding step S10, the superconducting wire 130 having a rectangular cross-sectional shape is wound around the bobbin 110 having the same shape as a track of a track having a straight section and a curved section to complete the superconducting coil 130 .

At this time, it is preferable that the width of the superconducting wire 131 is smaller than the width of the bobbin 110.

In the adhesive application step (S10), the first adhesive layer 180 is formed by applying an adhesive to at least one of the upper and lower sides of the superconducting coil 130, or both the upper and lower sides of the superconducting coil 130.

The first adhesive layer 180 may comprise a thermosetting epoxy.

The thickness of the first adhesive layer 180 and the width of the superconducting wire 131 are made to be the width of the bobbin 110.

The upper and lower bobbin plates 150 and 170 are pressed onto the upper and / or lower portions of the superconducting coil 130 coated with the first adhesive layer 180 and heat-treated in a high temperature atmosphere The first adhesive layer 180 is thermally cured to join the upper and lower bobbin plates 150 and 170 to the upper and lower portions of the superconducting coil 130.

As described above, since the epoxy is applied to the upper and / or lower portions of the superconducting coil 130 to maintain the superconducting coil 130 in the winding state, the epoxy available time is reduced to reduce the change in viscosity, Can be reduced.

Further, the winding operation of the superconducting wire 131 can be facilitated, and the preparation of the superconducting coil 130 is improved.

The method of manufacturing a superconducting coil assembly according to the present invention further includes a step of joining a reinforcing strip (S40) for further joining the reinforcing strip (160) around the superconducting coil (130) wound before the upper and lower bobbin plate joining step (S50) As shown in FIG.

The reinforcing strip 160 is composed of a G10 glass composite excellent in mechanical strength and electrical insulation, and can be attached to the periphery of the superconducting coil 130 through an adhesive. The adhesive may comprise, for example, an epoxy.

The reinforcing band 160 may be provided on both sides of the superconducting coil 130 corresponding to the linear section of the bobbin 110 in consideration of workability and generation of magnetic fields on both sides of the superconducting coil 130.

FIG. 6 is a graph showing the current-voltage characteristics of the superconducting coil according to the prior art, and FIG. 7 is a graph showing current-voltage characteristics of the superconducting coil according to an embodiment of the present invention.

6 is a graph showing current-voltage characteristics of six superconducting coils (Coil 01 to Coil 06) manufactured by winding six superconducting wires having different characteristics by a wet-type winding method according to the related art .

In FIG. 6, the horizontal axis represents the critical current value, and the vertical axis represents the voltage value that is a criterion for measuring the critical current value according to each coil.

In the graph, the coefficient Ic is the critical current value of the superconducting wire, JR (Joint Resistance) is the junction resistance, and n is the current-voltage characteristic in the superconducting state expressed by V (voltage) αI Lt; / RTI >

FIG. 7 is a graph showing the relationship between the currents for six superconducting coils (Coil # 1-01 to Coil # 1-06) fabricated by winding the same type of superconducting wire applied to FIG. 6 by a winding method according to an embodiment of the present invention. - A graph that analyzes the voltage characteristics.

6 and FIG. 7, it can be seen that the critical current characteristic of the superconducting coil according to an embodiment of the present invention is increased by at least 12A.

Although the present invention has been described with reference to the accompanying drawings and the preferred embodiments described above, the present invention is not limited thereto but is limited by the following claims. Accordingly, those skilled in the art will appreciate that various modifications and changes may be made thereto without departing from the spirit of the following claims.

1: superconducting rotating machine 10: rotor
100: superconducting coil assembly 110: bobbin
130: superconducting coil 131: superconducting wire
150, 170: upper and lower bobbin plates 160: reinforcing strips
180: first adhesive layer 190: second adhesive layer

Claims (17)

Bobbin;
A superconducting coil formed by winding a superconducting wire around the bobbin;
An upper bobbin plate disposed on the superconducting coil;
A lower bobbin plate disposed below the superconducting coil; And
And a first adhesive layer applied to either the upper or lower portion of the superconducting coil to bond the superconducting coil with at least one of the upper and lower bobbin plates. The method according to claim 1,
Wherein the first adhesive layer comprises an epoxy. The method according to claim 1,
And a reinforcing strip provided on the outer periphery of the superconducting coil. The method of claim 3,
Wherein the reinforcing strip comprises a glass composite. The method of claim 3,
And a second adhesive layer disposed between the reinforcing strip and the superconducting coil. Bobbin;
A superconducting coil formed by winding a superconducting wire around the bobbin;
An upper bobbin plate disposed on the superconducting coil;
A lower bobbin plate disposed below the superconducting coil; And
And a first adhesive layer applied to both the upper and lower sides of the superconducting coil to bond the upper and lower bobbin plates and the superconducting coil. The method according to claim 6,
Wherein the first adhesive layer comprises an epoxy. The method according to claim 6,
And a reinforcing strip provided around an outer surface of the superconducting coil. 9. The method of claim 8,
Wherein the reinforcing strip comprises a glass composite. 9. The method of claim 8,
And a second adhesive layer disposed between the reinforcing strip and the superconducting coil. A rotor of a superconducting rotating machine having a superconducting coil assembly according to any one of claims 1 to 10. Winding a superconducting wire around the bobbin to form a superconducting coil;
Applying an adhesive to at least one of an upper portion and a lower portion of the superconducting coil; And
Coupling the upper bobbin plate and the lower bobbin plate to the upper and lower portions of the superconducting coil through the applied adhesive at the upper and lower portions of the superconducting coil;
Wherein the superconducting coil assembly comprises: 13. The method of claim 12,
Wherein the adhesive comprises an epoxy resin. 13. The method of claim 12,
Further comprising joining a reinforcing band around the superconducting coil. 15. The method of claim 14,
Wherein the reinforcing strip comprises a glass composite. 15. The method of claim 14,
Wherein the reinforcing strip is bonded to the periphery of the superconducting coil by an adhesive. 15. The method of claim 14,
Wherein the adhesive applied between the reinforcing strip and the superconducting coil comprises an epoxy resin.

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