JPH0869827A - Terminal of AC superconducting equipment - Google Patents

Abstract

(57) [Abstract] [Purpose] To prevent temperature rise due to eddy currents generated at terminals, to reduce the external size and save energy. [Structure] A pair of grooves 3a parallel to one surface of a terminal plate 3 made of an aluminum nitride material is formed. A connection plate 5 having a pair of curved portions 5a protruding therefrom is joined to one surface of the terminal plate 3 by brazing.
The superconducting conductor 2 is provided on the inner side of one side of the curved portion 5a of the connecting plate 5.
a is brazed and the outer conductor 4 is brazed to the other inside of the curved portion 5a. Superconducting conductor 2a and outer conductor 4
The magnetic flux generated by the current flowing through the connection plate 5 between and prevents the eddy current generated in the connection plate 5 by passing through the terminal plate 3 located outside the connection plate 5, and this eddy current Prevents heat generation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal portion of an AC superconducting device housed in a cryogenic container.

[0002]

2. Description of the Related Art As one of the superconducting application techniques, AC superconducting devices such as superconducting fault current limiters and superconducting transformers incorporating a superconducting coil have been developed.

In order to put these AC superconducting devices into practical use, it is important to reduce the loss generated in the cryogenic temperature range. For example, in a superconducting conductor that constitutes a superconducting coil, heat generated by hysteresis loss and coupling loss due to an alternating magnetic field generated at the terminal portion of the superconducting conductor becomes a problem.

That is, in the current lead connecting between the room temperature terminal and the superconducting coil or the introduction terminal portion of the cryogenic container, the loss generated by Joule heat due to the contact resistance of the connection portion or the alternating magnetic field generated by the energizing current is caused. There is eddy current loss.

FIG. 6 is a view showing a terminal portion of a conventional AC superconducting device. Reference numeral 1 is a winding frame, reference numeral 2 is a superconducting conductor as a wire rod of a superconducting coil wound around the winding frame 1, and a reference numeral 3C.
Is a terminal connected to both ends of the superconducting coil, and reference numeral 4 is an external conductor connected to each terminal 3C.

In the superconducting coil constructed as described above, a pair of pan head screws 7 having a copper plate terminal 3C are provided at the beginning and the end of the cylindrical winding frame 1 made of an insulating material such as glass fiber reinforced plastic. It is fixed symmetrically in each. The superconducting conductor 2 is wound around the spirally formed groove on the winding frame 1 with a predetermined tension, and the superconducting conductors 2a at both ends thereof are connected to the terminal 3C by a method such as soldering. .

The function required for this terminal 3C is the first
Second, by maintaining the tension of the superconducting conductor 2 wound around the bobbin 1, secondly, the superconducting conductor 2 connected to the start end and the end is
It is stabilization of the superconducting state of a.

Of these, the first function is to prevent the superconducting conductor from moving due to electromagnetic force or the like, to prevent the occurrence of quenching due to the movement, and to prevent the conduction capacity from being reduced due to frictional heat during the movement. .

That is, when a current flows through the superconducting conductor,
An electromagnetic force (a force that causes the coil to contract in the axial direction) and a circumferential electromagnetic force (a force that causes the diameter to expand) called a hoop force are generated between adjacent conductors in the superconducting conductor. In order to prevent the movement of the superconducting conductor against these electromagnetic forces, the shape of the groove formed on the outer periphery of the winding frame should be optimized, and the friction coefficient between the superconducting conductor and the winding frame and winding It is necessary to increase such tension. Therefore, the tension applied to the winding of the superconducting conductor is usually wound around the winding at a value close to the upper limit of the allowable stress of the superconducting conductor.

Therefore, each terminal 3C is required to have a strength capable of maintaining its position with respect to the tension applied to such a superconducting conductor without causing distortion or deformation.

A second function is to prevent the loss of current-carrying capacity due to the temperature rise of the superconducting conductor due to the loss due to the resistance generated at the portion where the current flows from the outer conductor to the superconducting coil and other losses. Is.

That is, the current flowing in and out of the superconducting coil always passes through the normal conducting portion at the terminal portion, but the superconducting wire itself is a stabilizing material called a matrix (for example, a normal conducting layer of copper or copper nickel alloy). It has a structure in which a superconducting filament is embedded inside, and the solder used for joining is transferred from the superconducting conductor to the normal conductor in an extremely weak magnetic field, and electric resistance occurs, so that the superconducting conductor in the superconducting state It is difficult to maintain. The current flowing through the superconducting coil causes a loss due to Joule heat when flowing through the normal conducting layers, and raises the temperature of the solder layer used for the superconducting conductor and the joining.

On the other hand, since the terminal plate 3C is electrically arranged in parallel with the above-mentioned normal conducting layer, it has the effect of reducing the resistance of the electric circuit and the amount of heat generation. Further, the terminal plate 3C has an action of absorbing the generated heat amount and radiating heat from its surface to the surrounding refrigerant. This suppresses the temperature rise of the superconducting conductor and prevents the current carrying capacity of the superconducting conductor from decreasing.

Therefore, the terminal plate 3C is required to have a function of reducing the electric resistance with respect to the applied current, a function of absorbing (accumulating) the amount of heat generated in the normal conducting portion, and a function of radiating heat. Therefore, oxygen-free copper having a small specific resistance and a large thermal conductivity is generally used for the conventional terminal board in order to meet these required functions.

FIG. 7 (a) shows an example of the shape and size of a terminal plate of a conventional kA-class AC superconducting coil, and FIG.
(B) is a CC arrow view of FIG. 7 (a). Figure 7
As shown in (a) and (b), the terminal plate 3C has a width W = 5.
(Cm), length (L) = 10 (cm), thickness (t) = 0.5 (c
m), the superconducting conductor 2a is arranged along the lengthwise direction on the widthwise center of the terminal plate 3C, and the superconducting conductor 2a is joined to the terminal plate 3C together with the outer conductor 4 by soldering. ing.

A flat portion is formed on the reel 1 for mounting the terminal body 3C, and a pair of heliserts 6 are screwed into the flat portion. The terminal body 3C is fixed to the winding frame 1 by a pan head machine screw 7 having a tip screwed to the helisert 6. Also, the length of the terminal board 3C is 10 (c
m) is the dimension required for stable current transfer from the superconducting coil conductor to the outer conductor, and is a value determined based on the experimental results of the kA class superconducting coil.

[0017]

However, in the terminal portion of the conventional AC superconducting device configured as described above,
As described above, the eddy current loss generated by the current flowing through the superconducting conductor becomes a problem.

For example, in the terminal portion as shown in FIG. 7, the current i flows concentratedly in the superconducting conductor 2a having no resistance. The alternating magnetic flux φ generated by the current i penetrates both sides of the terminal plate 3C as shown in the explanatory view of FIG. Then
Since the terminal plate 3C is an oxygen-free copper material as described above, the counter electromotive force Ee is induced so as to cancel the alternating magnetic flux φi, and the eddy current IE flows. As a result, the eddy current loss Pe is generated in the terminal plate 3C due to the eddy current ie and the resistance component of the terminal plate 3C.

FIG. 9 shows an equivalent circuit of the eddy current flowing in the terminal plate 3C and a formula for calculating the back electromotive force, and the reference symbol Ee is
The voltage generated by the counter electromotive force, reference sign Le, is the inductance component, and reference sign Re is the resistance component.

By the eddy current generated in this way,
A loss of several W, that is, heat is generated at the terminal portion of the conventional kA class AC superconducting coil. This heat increases the amount of vaporization of the refrigerant (liquid helium) that cools the superconducting coil, so a refrigerator of several kW scale is incorporated for reliquefaction. Therefore, the loss of the terminal plate in the AC superconducting coil is an indispensable problem to be solved in order to downsize such a superconducting device and save power.

In view of the above problems, the present invention reduces the loss due to the eddy currents generated at the terminals of AC superconducting equipment, and makes it possible to downsize the AC superconducting device and save power. The purpose is to obtain the terminal part of the equipment.

[0022]

According to a first aspect of the present invention, an insulating plate having one end connected to and fixed to an end of a superconducting coil, and at least one surface of the insulating plate fixed to one end of the superconducting coil. Is a terminal portion of an AC superconducting device including a connecting plate and an external conductor that is fixed to the connecting plate in opposition to one end of the conductor of the superconducting coil and is connected to the outside of the superconducting coil.

The invention according to claim 2 is such that an insulating plate having one side connected to and fixed to an end of the superconducting coil, and a conductive coating formed on at least one surface of the insulating plate and having one end of the superconducting coil fixed thereto. And a terminal portion of an AC superconducting device including an external conductor that is fixed to the conductive coating and is connected to one end of the conductor of the superconducting coil and is connected to the outside of the superconducting coil.

The invention according to claim 3 is such that a metal plate having one end connected to and fixed to an end of the superconducting coil, and a superconducting layer fixed to at least one surface of the metal plate and having one end of the superconducting coil fixed thereto. And a terminal portion of an AC superconducting device including an external conductor that is fixed to the superconducting layer and is connected to one end of the conductor of the superconducting coil and is connected to the outside of the superconducting coil.

Further, the invention according to claim 4 is characterized in that, in the terminal portion of the AC superconducting device according to claim 3, the superconducting layer is an oxide superconductor.

[0026]

According to the first aspect of the invention, the magnetic flux generated by the alternating current flowing between the one end of the superconducting coil and the outer conductor is the superconducting coil and the outer conductor which are placed relative to each other via the connecting plate, and these superconducting coils. The alternating current flowing through the connecting plate between the coil and the outer conductor causes it to pass through the outer periphery of the connecting plate.

Further, in the invention described in claim 2,
The magnetic flux generated by the alternating current flowing between one end of the superconducting coil and the outer conductor is generated by the alternating current flowing between the superconducting coil and the outer conductor, which are placed relative to each other through the conductive coating, and the conductive coating between these superconducting coil and the outer conductor. , Will pass the outer periphery of the conductive coating.

Further, in the invention described in claim 3,
The magnetic flux generated by the alternating current flowing between one end of the superconducting coil and the outer conductor is generated by the alternating current flowing through the superconducting coil and the outer conductor, which are placed relative to each other via the superconducting layer, and between these superconducting coils and the outer conductor. , Will pass the outer circumference of the superconducting layer and the metal plate.

Further, in the invention as set forth in claim 4, the magnetic flux generated by the alternating current flowing between one end of the superconducting coil and the outer conductor, is generated by the superconducting coil and the outer conductor which are placed relative to each other via the oxide superconductor. , By the alternating current flowing through the oxide superconductor between these superconducting coils and the outer conductor,
It will pass through the outer periphery of the oxide superconductor and the metal plate.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the terminal portion of an AC superconducting device of the present invention will be described below with reference to the drawings. FIG. 1A is a diagram showing a terminal portion of an AC superconducting device of the invention described in claim 1, and is a diagram corresponding to FIG. 7A shown in the prior art, and FIG.
FIG. 7B is a view taken along the line AA of FIG.
1B corresponds to FIG. 1B, and FIG. 1C corresponds to FIG.
FIG.

In FIG. 1, what is different from FIG. 7 shown in the prior art is the material of the terminal plate 3 and the fixing structure of the superconducting conductor 2a and the outer conductor 4 with respect to this terminal plate 3. It is the same.

That is, details are shown in the central portion of one surface of the terminal plate 3 made of the aluminum nitride material shown in FIG.
A pair of arc-shaped grooves 3a shown in (c) are preliminarily formed laterally in parallel. The distance between the pair of grooves 3a influences the joining force of the superconducting conductor 2a on the other side when joining or removing one of the superconducting conductor 2a and the outer conductor 4 which will be described later that are soldered to the grooves 3a. It is set not to.

On one side of the terminal plate 3, there is a connecting plate 5 made of an oxygen-free copper plate having a thickness of 1 mm in which arcuate curved portions 5a shown in FIG. The curved part 5a is fitted into the groove 3a of the terminal plate 3 and is attached, and has a melting point of 800 ° C.
It is soldered to the terminal board 3 with silver solder.

Among them, in FIG. 1, in the groove portion of the curved portion 5a formed at the rear of the connection plate 5, the connection portion of the superconducting conductor 2 having a diameter of 2 mm and made of the Nb-Ti system wound around the winding frame 1 is formed. A superconducting conductor 2a made of the same material as that of the superconducting conductor 2 is inserted and soldered with silver solder having a melting point of 200 ° C.

Similarly, in FIG. 1, the outer conductor 4, which is the same as the outer conductor 4 shown in FIGS. 6 and 7, is inserted into the groove of the curved portion 5a formed in front of the connecting plate 5 and has a melting point of 2
Soldered with 00 ° C silver solder.

FIG. 2A is a diagram showing magnetic flux generated when an AC current flows through the terminal portion of the AC superconducting device shown in FIG. 1A, and the current direction is from the winding frame 1 side. Outer conductor 4
It is explanatory drawing which shows the case where it flows in the direction. Also, FIG.
FIG. 2B is a right side view of FIG.

In FIGS. 2A and 2B, the superconducting conductor 2
The current it flowing from a through the outer conductor 4 to the outside is from the superconducting conductor 2a to the connecting plate 5 shown in FIG.
In the direction substantially orthogonal to the above, the current flows in all facing portions on an average basis.

Therefore, the magnetic flux generated by the current it does not interlink with the connecting plate 5. The superconducting conductor 2a and the outer conductor 4 are close to each other and provided in parallel. Among these, the superconducting conductor 2a to the outer conductor 4
The current it flowing to the superconducting conductor 2a is as described above.
2A and 2B, the magnetic flux φi generated by the current i flowing from the superconducting conductor 2a to the outside via the outer conductor 4 is almost equal to that in the facing portion of the outer conductor 4 and the outer conductor 4.
As shown in, the terminal plate 3 outside the connection plate 5 is penetrated.

Then, since the terminal plate 3 is made of aluminum nitride, which is almost an insulating material, no eddy current flows. Therefore, loss due to this eddy current, that is, heat is not generated.

The connecting plate 3 is made of oxygen-free copper,
Since a material having a plate thickness of 1 mm is used, there is no fear of an increase in the actual resistance due to the skin effect of the electric current described later.

Further, a small amount of heat generated in the outer conductor 4 which is a normal conducting wire and the solder film is transferred to the connecting plate 5,
Since heat is dissipated into the refrigerant from this connection plate 5 having a large surface area, there is no possibility of heat conduction to the superconducting conductor 2a and the superconducting conductor 2.

Table 1 shows the conventional oxygen-free copper material terminal body 3C shown in FIGS. 6 and 7, the oxygen-free copper material connection board 5 and the aluminum nitride material terminal board 3 shown in FIGS. This is a comparison between the outer shape of the and the characteristics at cryogenic temperature (4.2k). As for the characteristic value, the energizing current was AC1000Arms50Hz, and the cryogenic environment was in liquid helium.

[0043]

[Table 1]

As shown in Table 1, the loss generated in the terminal plate 3C used for the conventional terminal portion was 1.5 W in the measured value, whereas the loss of the connection plate 5 used for the terminal portion of the present invention was Loss is
The calculated value is 0.01W, which is 1/150 of the conventional value.

Here, the reason why the thickness of the connecting plate 5 is set to 1 mm so as to avoid the influence of the skin effect of the current as described above will be described below. That is, the penetration depth δ of the current flowing on the surface of the conductor due to the skin effect depends on the conductivity κ of the substance,
It is calculated from the following equation (1).

Δ = 1 / (ω · μ · κ) ^0.5 (m) ... (1) where ω: angular frequency of current (rad / sec) ω = 2 · π · f f: current Frequency (Hz) μ: Permeability (H / m) μ = μ _o · μ _s μ _o : Vacuum permeability 4π × 10 ^-7 (H / m) μ _s : Relative permeability κ: Conductivity (S) κ = 1 / ρ ρ: Resistivity (Ωm)

The skin effect of copper (current penetration depth δ) when an alternating current of 50 Hz was applied at extremely low temperature (4.2 K) was calculated from the values shown in Table 1 and the equation (1), δ = _4.2k = 0.0005
(M) = 0.5 (mm). That is, if the thickness of the connecting plate is about 1 mm or more, the resistance of the conductor, that is, the Joule heat may be calculated without considering the skin effect.

From the above results, the effective resistance Rc of the connecting plate 5 is
Rc = ρ · L / S = 1 × 10 ^-10 × 0.01 / 0.0001 = 1 × 10 ^-8 (Ω) where ρ: resistivity of the connecting plate 1 × 10 ^-10 (Ω
m) L: Distance between conductors 0.01 (m) S: Current cross section of connecting plate 0.0001 (m ² )

Therefore, the loss generated in the connecting plate 5 is
It is calculated by multiplying the effective resistance of the connecting plate 5 of 1 × 10 ⁻⁸ (Ω) obtained by the equation (2) by the square of the energizing current 1 × 10 ⁶ (1000 A 2). It becomes 0.01 (W).

Next, FIG. 3 is a view showing an embodiment of the terminal portion of the AC superconducting device according to claim 2 and is a view corresponding to FIG. 1. In FIGS. 1 (a), (b), and (c), since the current-carrying capacity is as large as several kA, an example in which a connection plate made of an oxygen-free copper material is joined to one surface of an insulating terminal plate has been described. When the current-carrying capacity is small, the terminal portion as shown in FIG. 3 may be used.

3 is different from FIG. 1 in that instead of the connection plate 5 shown in FIG. 1, the terminal plate 3 shown in FIG.
The vapor deposition coating layer 8 made of copper is formed on the central portion of one side of the terminal plate 3A made of aluminum nitride, which has almost the same shape as that of FIG. Is. In this case, since it is difficult to form the thick vapor-deposited coating layer 8, it cannot be applied to a connection portion having a large current-carrying capacity, but there is an advantage that a connection plate is not necessary and a soldering step is also unnecessary.

FIG. 4 is a view showing a terminal portion of the AC superconducting device according to claims 3 and 4, and FIG.
(A) and the figure corresponding to FIG. 3, and (b) is FIG.
It is a BB arrow line view of (a), and is a figure similarly corresponding to FIG.1 (b). In this case, the superconducting layer 4 is formed on the surface of the terminal plate made of the aluminum nitride material shown in FIGS.

In FIGS. 4A and 4B, a conductive plate made of an oxide superconducting material is provided on both sides of the terminal plate 3B which is slightly thinner than the terminal plates 3 and 3A shown in FIGS. 9 is brazed.

FIG. 5 is an explanatory view showing the distribution of magnetic flux generated by the current supplied to the terminal portion of the AC superconducting device shown in FIG. In FIG. 5, a part of the current flowing from the superconducting conductor 2a to the external device via the outer conductor 4 is also branched to the conductor 9 in the process of flowing from the superconducting conductor 2a to the outer conductor 4. Therefore, the magnetic flux φi of the terminal portion is outside the conductor 9 as shown in FIG. 5 and does not penetrate the conductor 9.
Therefore, eddy current is not generated even in the terminal portion of the AC superconducting device configured as described above, so that generation of heat due to this eddy current can be prevented.

The conductor 9 may be brazed only on one side, and instead of brazing the conductor 9, powder of the oxide superconducting material may be vapor-deposited on one or both sides of the terminal plate 3B.

In this case, the loss due to the surface shielding current of the superconducting layer is almost negligible because the resistance value of the superconducting layer is zero. With such a configuration, the same effect as that of the previous embodiment can be obtained, and at the same time, since the superconducting conductor 2 and the outer conductor 4 are connected by the superconducting layer with a resistance value of zero, that portion of The effect of making the loss almost zero is also obtained.

Therefore, the loss of the terminal portion of the superconducting coil cooled by using the low temperature refrigerant can be reduced to about 1/150 of the terminal portion of the conventional AC superconducting equipment, and the capacity of the refrigerator or compressor can be reduced. The number can be reduced, and the outer shape can be made smaller.

[0058]

As described above, according to the invention of claim 1,
An insulating plate having one end connected to and fixed to the end of the superconducting coil, a connecting plate fixed to at least one surface of the insulating plate and having one end of the superconducting coil fixed, and a connecting plate facing one end of the conductor of the superconducting coil. By equipping the terminal part of the AC superconducting device with an external conductor that is fixed to the outside and is connected to the outside of the superconducting coil, the magnetic flux generated by the alternating current flowing between one end of the superconducting coil and the external conductor is placed via the connection plate. Since the outer circumference of the superconducting coil and the outer conductor and the connecting plate between these superconducting coil and the outer conductor was passed through the outer periphery of the connecting plate, the loss due to the eddy current generated at the terminal portion was reduced, and the AC superconducting device It is possible to obtain a terminal portion of an AC superconducting device that can achieve downsizing and power saving.

According to the second aspect of the present invention, an insulating plate having one side connected and fixed to the end of the superconducting coil, and one end of the superconducting coil formed on at least one surface of the insulating plate are fixed. By providing an electrically conductive coating and an external conductor that is fixed to the electrically conductive coating opposite one end of the conductor of the superconducting coil and is connected to the outside of the superconducting coil in the terminal portion of the AC superconducting device, the one end of the superconducting coil and the outer conductor Since the magnetic flux generated by the alternating current flowing between the superconducting coil and the outer conductor, which are placed relative to each other via the conductive coating, and the alternating current flowing through the conductive coating between these superconducting coil and the outer conductor, passed through the outer periphery of the conductive coating. It is possible to obtain a terminal portion of an AC superconducting device which can reduce the loss due to the eddy current generated at the terminal portion and can achieve downsizing of the AC superconducting device and power saving. Further, according to the invention as set forth in claim 3, a metal plate, one side of which is connected and fixed to an end of the superconducting coil,
The superconducting layer fixed to at least one surface of the metal plate and having one end of the superconducting coil fixed thereto, and the external conductor fixed to the superconducting layer facing the one end of the conductor of the superconducting coil and connected to the outside of the superconducting coil The magnetic field generated by the alternating current flowing between the one end of the superconducting coil and the outer conductor is placed on the superconducting coil and the outer conductor by way of the superconducting layer, and between the superconducting coil and the outer conductor. Since the alternating current that flows through the superconducting layer of this type passed through the outer periphery of the superconducting layer and the metal plate, the loss due to the eddy current generated at the terminal part can be reduced, and the AC superconducting device can be downsized and save power. The terminal part of the device can be obtained.

Further, according to the invention of claim 4,
In the terminal portion of the AC superconducting device according to claim 3, the superconducting layer is made of an oxide superconductor, so that the magnetic flux generated by an alternating current flowing between one end of the superconducting coil and the outer conductor is made to be an oxide superconductor. The superconducting coil and the outer conductor that are placed relative to each other and the alternating current flowing through the oxide superconductor between the superconducting coil and the outer conductor caused the oxide superconductor and the outer circumference of the metal plate to pass, so that it occurred at the terminal part. It is possible to obtain a terminal portion of an AC superconducting device capable of reducing the loss due to the eddy current that occurs and reducing the size and power consumption of the AC superconducting device.

[Brief description of drawings]

FIG. 1A is a diagram showing an embodiment of a terminal portion of an AC superconducting device according to the invention as set forth in claim 1, and FIG.
-A arrow view, (c) is a partially enlarged detailed view of (b).

FIG. 2 (a) is a front view showing the operation of the terminal portion of the AC superconducting device of the invention according to claim 1, and FIG. 2 (b) is a right side view of FIG.

FIG. 3 is a diagram showing an embodiment of a terminal portion of the AC superconducting device according to the invention described in claim 2.

FIG. 4A is a front view showing an embodiment of the terminal portion of the AC superconducting device according to the invention of claim 2.

FIG. 5 is a right side view showing the operation of the terminal portion of the AC superconducting device according to the third aspect of the invention.

FIG. 6 is a diagram showing an example of a terminal portion of a conventional AC superconducting device.

7 (a) is a partially enlarged detailed view of FIG. 6, and FIG. 7 (b) is
(A) CC arrow line view.

FIG. 8 is an explanatory diagram showing an operation of a terminal portion of a conventional AC superconducting device.

FIG. 9 is a connection diagram showing an operation of a terminal portion of a conventional AC superconducting device.

[Explanation of Codes] 1 ... Reel, 2, 2a ... Superconducting conductor, 3, A, 3B ... Terminal plate, 3a ... Groove, 4 ... External conductor, 5 ... Connection plate, 5a ... Curved portion, 6 ... Helisert, 7 ... pan head machine screw, 8 ... vapor deposition coating layer, 9 ... conducting plate.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuyuki Tsurunaga No. 1 Toshiba-cho, Fuchu-shi, Tokyo Inside the Fuchu factory, Toshiba Corp. (72) Inventor Takashi Yazawa Komukai-shi Toshiba-cho, Kawasaki-shi, Kanagawa No. 1 Stock ceremony Company Toshiba Research & Development Center (72) Inventor Takamitsu Tada 1-1-1, Shibaura, Minato-ku, Tokyo Inside Toshiba Head Office Co., Ltd. (72) Inventor Jun Matsuzaki 1 Fuchu-cho, Fuchu-shi, Tokyo Toshiba Fuchu Factory Co., Ltd. Within

Claims (4)

[Claims] 1. An insulating plate having one end connected to and fixed to an end of the superconducting coil, a connecting plate fixed to at least one surface of the insulating plate and having one end of the superconducting coil fixed, and a conductor of the superconducting coil. A terminal portion of an AC superconducting device, comprising an outer conductor fixed to the connection plate opposite to one end and connected to the outside of the superconducting coil. 2. An insulating plate having one end connected to and fixed to an end of the superconducting coil, and a conductive coating formed on at least one surface of the insulating plate and having one end of the superconducting coil fixed thereto.
A terminal portion of an AC superconducting device, comprising an outer conductor that is fixed to the conductive coating and is connected to one end of a conductor of the superconducting coil and is connected to the outside of the superconducting coil. 3. A metal plate having one end connected to and fixed to an end of the superconducting coil, and a superconducting layer fixed to at least one surface of the metal plate and having one end of the superconducting coil fixed thereto.
A terminal portion of an AC superconducting device, comprising an outer conductor, which is fixed to the superconducting layer in opposition to one end of a conductor of the superconducting coil and is connected to the outside of the superconducting coil. 4. The terminal portion of an AC superconducting device according to claim 3, wherein the superconducting layer is an oxide superconductor.