JPH10256030A - Superconducting coil device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a highly stable superconducting coil by a method wherein the amount of consumption of liquid helium by the excessive Joule loss on a balance resistor and also by easily equalizing the current distribution on each strand. SOLUTION: In the superconducting coil device provided with a superconducting coil 10 containing a plurality of strands 2a and 2b, which are series connected and wound, and a power source 3 used to feed power to the superconducting coil 10, superconducting switches 5a and 5b, showing to prescribed resistance value in an open circuit state, are series connected to each strand, the superconducting switches 5a and 5b are brought into a closed state after completion of current application, and the resistance value is zeroes.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a superconducting coil device provided with a superconducting coil composed of a plurality of wires (twisted superconducting wires) connected in parallel and wound, and more particularly, to a current between the wires. The present invention relates to a superconducting coil device in which the sharing is uniform and the power consumption is reduced.

[0002]

2. Description of the Related Art Conventionally, a device using a superconducting coil composed of a plurality of wound parallel conductors (element wires) is well known, for example, in Torii et al.
t. al. 1993) "Analysis of Analysis on AC Superconducting Cable (ANALYSIS OF
DEGRADATION IN AC SUPERCO
NDUCTING CABLES) "IEE Transactions on Applied Superconductivity (IEEE TRANSACTIONS)
ON APPLIED SUPERCONDUCTIV
ITY), vol. 3, no.

FIG. 13 is an equivalent circuit diagram showing a configuration example of a conventional superconducting coil device described in the above document. FIG.
In the figure, reference numeral 1 denotes a superconducting coil composed of wound parallel wires 2a and 2b. Here, only two wires 2a and 2b are shown for convenience, but in practice, any number of wires For example, several hundred strands are used.

As is well known, the superconducting coil 1 is installed in a cryostat containing an ultra-low temperature refrigerant such as liquid helium, and each of the wires 2a and 2b is constituted by a superconducting wire having an electric resistance value generally zero at an extremely low temperature. Have been. Reference numeral 3 denotes a power supply connected between both ends of the superconducting coil 1 to supply power to the superconducting coil 1.

Next, the operation of the conventional superconducting coil device shown in FIG. 13 will be described. First, when power is supplied from the power supply 3, a current flows through the superconducting coil 1, and this current is divided into the element wires 2a and 2b.

At this time, it is desirable that the current is equally shunted to each of the wires 2a and 2b. However, in practice, the difference between the wire lengths of the wires 2a and 2b and the average winding Since a difference occurs in the self-inductance value of each of the strands 2a and 2b due to a difference in radius and the like, current does not flow evenly through each of the strands 2a and 2b.

In order to equalize the current flowing through each of the wires 2a and 2b, a superconducting coil device has been proposed in which a balance resistor is connected in series to each of the wires 2a and 2b. FIG. 14 is an equivalent circuit diagram showing another zero of the conventional superconducting coil device described in the above-mentioned document, wherein 1A corresponds to the superconducting coil 1, and 2a, 2b and 3 are equivalent to those described above. .

In FIG. 14, reference numerals 4a and 4b denote balance resistors individually connected in series to the strands 2a and 2b, and constitute means for equalizing the current distribution of the strands 2a and 2b. I have.

In this case, the balance resistors 4a and 4b
Are set so as to cancel out the variation of the mutual inductance value of the strands 2a and 2b to equalize the current distribution. Therefore, even if there is a difference between the mutual inductance values of the wires 2a and 2b, current flows evenly through the wires 2a and 2b.

However, after the current distribution in superconducting coil 1A is equalized, it is not desirable that excess Joule loss continues to be generated in balance resistors 4a and 4b.

This is because such a Joule loss increases wasteful consumption of the refrigerant (for example, liquid helium) in the superconducting coil 1A and decreases the stability of the superconducting coil 1A, thereby causing a quench (when superconductivity is released). (A state in which a resistance value occurs).

[0012]

As described above, in the conventional superconducting coil device, since the balance resistors 4a and 4b are connected in series in order to equalize the current distribution of the wires 2a and 2b, the balance is There is a problem that extra Joule loss occurs in the resistors 4a and 4b, the consumption of liquid helium increases, and the stability of the superconducting coil is reduced, which may lead to quench.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is possible to suppress the consumption of liquid helium due to Joule loss, and to easily equalize the current distribution of each strand to achieve stability. It is an object to obtain a superconducting coil device having a high level.

[0014]

According to a first aspect of the present invention, there is provided a superconducting coil device comprising a superconducting coil including a plurality of wires wound in parallel and wound, and a power supply for supplying power to the superconducting coil. In the superconducting coil device provided with
A superconducting switch showing a predetermined resistance value when opened is connected in series for each element wire.

Further, in the superconducting coil device according to a second aspect of the present invention, in the first aspect, the superconducting switch includes a plurality of superconducting switches connected in series to each other.

In the superconducting coil device according to a third aspect of the present invention, the weights are set so that the resistance values of the plurality of superconducting switches in the superconducting switch are different from each other and can be finely adjusted. It is a thing.

According to a fourth aspect of the present invention, there is provided a superconducting coil device according to the first or second aspect, wherein each superconducting switch is opened and closed by a thermal method, so that a superconducting member connected in series to the element wire. And a heater disposed close to the superconducting member, wherein the heater generates a temperature exceeding the critical temperature of the superconducting member, thereby opening the superconducting switch.

According to a fifth aspect of the present invention, there is provided a superconducting coil device according to the first or second aspect, wherein each superconducting switch is opened and closed by a magnetic field method so that the superconducting member is connected in series to the element wire. And an exciting coil disposed close to the superconducting member, and the exciting coil generates a magnetic flux exceeding a critical magnetic flux density of the superconducting member, thereby opening the superconducting switch.

Further, in the superconducting coil device according to claim 6 of the present invention, in claim 4 or 5, the superconducting member in each superconducting switch is constituted by a superconducting winding of non-induction winding. .

According to a seventh aspect of the present invention, in the superconducting coil device according to the fourth or fifth aspect, the superconducting member in each superconducting switch is constituted by a superconducting winding of an induction winding.

According to an eighth aspect of the present invention, in the superconducting coil device according to the fourth aspect, the superconducting switch has a single bobbin, and the superconducting member is constituted by a superconducting winding and wound around the bobbin. The heater is attached to the bobbin.

A superconducting coil device according to a ninth aspect of the present invention is the superconducting coil device according to the fifth aspect, wherein the superconducting switch has a single winding frame, and the superconducting member is constituted by a superconducting winding and wound around the winding frame. And the excitation coil is attached to the bobbin.

A superconducting coil device according to a tenth aspect of the present invention is the superconducting coil device according to the first or second aspect, wherein the superconducting coil includes a plurality of element wires connected in series and wound with each other, and , Are installed at one end of a group of strands connected in series.

According to an eleventh aspect of the present invention, there is provided a superconducting coil device according to the first or second aspect, wherein the superconducting coil includes a plurality of wires connected in series and wound with each other, and , Are arranged between a plurality of strands connected in series.

A superconducting coil device according to a twelfth aspect of the present invention is the superconducting coil device according to any one of the first to eleventh aspects, wherein the superconducting switch connected in series to each element wire comprises:
They are configured to work together.

[0026]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an equivalent circuit diagram showing a schematic configuration of the first embodiment. In FIG. 1, reference numeral 10 corresponds to the superconducting coil 1A, and reference numerals 2a, 2b, and 3 are the same as those described above.

5a and 5b are superconducting switches,
Each of the strands 2a and 2b is individually connected in series. R
a and Rb are simulated resistors schematically showing the resistance values when the superconducting switches 5a and 5b are open, and are described above (FIG. 1).
As in the case of the balance resistors 4a and 4b, each of the wires 2a and 2b has a predetermined resistance value for canceling the variation in the mutual inductance value.

Sa and Sb are simulated switches schematically showing the open / close state of the superconducting switches 5a and 5b.
Each of the simulated resistors Ra and Rb is connected in parallel with each other and is configured to operate in conjunction with each other.
a and Rb are short-circuited.

Next, the operation of the first embodiment of the present invention shown in FIG. 1 will be described. First, before power is supplied from the power supply 3 to the superconducting coil 10, the superconducting switches 5a and 5
b is set to the open state (the state shown). That is, the simulated switches Sa and Sb in the superconducting switches 5a and 5b are opened, and the simulated resistors Ra and Rb are made effective.

In this state, the superconducting coil 10
, The distribution of current flowing through each of the strands 2a and 2b is equalized by the same operation and effect as those of the balance resistors 4a and 4b.

Subsequently, after the flow of the equalizing current to the superconducting coil 10 is completed, the superconducting switches 5a and 5b are closed. That is, the superconducting switch 5
The simulated switches Sa and Sb in a and 5b are short-circuited.

As a result, the simulated resistors Ra and Rb become invalid and the resistance values of the superconducting switches 5a and 5b become zero, so that the extra Joule loss due to the simulated resistors Ra and Rb is eliminated.

In the first embodiment, the simulated switches Sa and Sb in the superconducting switches 5a and 5b are constituted by interlocking switches, but they may be constituted so as to operate synchronously using individually operated switches. .

Embodiment 2 Further, in the first embodiment, a single superconducting switch is connected to each of the strands 2a and 2b using a pair of superconducting switches 5a and 5b, but a plurality of superconducting switches are connected to each of the strands 2a and 2b. Superconducting switches may be connected in series.

Hereinafter, a second embodiment of the present invention in which a plurality of superconducting switches are connected in series for each of the strands 2a and 2b will be described with reference to the drawings. FIG. 2 is an equivalent circuit diagram showing a schematic configuration of the second embodiment of the present invention.
Corresponds to the superconducting coil 10, and 2a, 2b and 3 are the same as described above.

Reference numerals 5a1 and 5a2 denote superconducting switches connected in series to the element wire 2a, which are connected in series to each other. 5b1 and 5b2 are superconducting switches connected in series to the strand 2b, and are connected in series to each other. Superconducting switches 5a1 and 5b1 are configured to interlock with each other, and superconducting switches 5a2 and 5b2 are configured to interlock with each other.

Sa1 and Sb1 are the superconducting switches 5
Simulated switches within a1 and 5b1, Ra1 and Rb
1 is a simulated resistor in each superconducting switch 5a1 and 5b1, Sa2 and Sb2 are simulated switches in each superconducting switch 5a2 and 5b2, and Ra2 and Rb2 are simulated resistors in each superconducting switch 5a2 and 5b2.

Simulated resistor Ra connected in series to the wire 2a
1 and Ra2 are equal to the simulated resistor R in FIG.
a, and the combined resistance value of the simulated resistors Rb1 and Rb2 connected in series to the strand 2b is set to correspond to the resistance value of the simulated resistor Rb in FIG. ing.

Although the case where two superconducting switches are connected to each of the strands 2a and 2b is shown here for convenience, an arbitrary plurality of superconducting switches are actually connected. Further, in this case, the resistance values of the simulated resistors in each of the superconducting switches connected in series are different from each other, and are weighted so that fine adjustment of equalizing the current distribution is possible.

Next, the operation of the second embodiment of the present invention shown in FIG. 2 will be described. First, as described above, the superconducting switches 5a1, 5b1, 5a2, and 5b2 are opened before power is supplied from the power supply 3 to the superconducting coil 20. That is, the superconducting switches 5a1, 5b1, 5a2
And the simulated switches Sa1, Sb1, Sa2 in 5b2
And Sb2 are opened, and each of the simulated resistors Ra1, Ra
2, Rb1 and Rb2 are valid.

In this state, the superconducting coil 20
, The distribution of current flowing through each of the strands 2a and 2b is equalized by the same operation and effect as those of the balance resistors 4a and 4b.

At this time, the simulated switches Sa1 and S1 are monitored while monitoring the value of the current flowing through each of the strands 2a and 2b.
By appropriately opening and closing b1 or the simulated switches Sa2 and Sb2, the current distribution in the superconducting coil 20 can be more easily and precisely equalized.

Subsequently, after the current supply is completed,
The superconducting switches 5a1, 5a2, 5b1 and 5b2 are all closed. That is, the simulation switch Sa1,
Sa2, Sb1 and Sb2 are all short-circuited.

As a result, the simulated resistors Ra1, Ra2,
Rb1 and Rb2 become invalid and each superconducting switch 5
Since the resistance values of a1, 5a2, 5b1 and 5b2 become zero, the simulated resistors Ra1, Ra2, Rb1 and Rb2
The extra joule loss at the stage is eliminated.

Embodiment 3 In the first embodiment, the specific configuration of the superconducting switches 5a and 5b is not specifically described. However, for example, the superconducting members connected in series to the strands 2a and 2b are heated to form a thermal system. And may be configured to open and close.

FIG. 3 is an equivalent circuit diagram showing a third embodiment of the present invention in which superconducting switches 5a and 5b are formed by a thermal method. In FIG. 3, 10A corresponds to superconducting coil 10 described above (see FIG. 1). 2a, 2b, 3, 5
a and 5b are the same as described above.

Wa and Wb are simulated resistors Ra and R
b (see FIG. 1), and a superconducting winding
And 2b are individually connected in series. Superconducting winding W
As is well known, a and Wb are made of a material that is easily quenched at a low temperature and generates a stable resistance value at the time of quenching.

Here, the simulated resistors Ra and R
In order to secure the function as b, the superconducting windings Wa and Wb are formed in a winding configuration. However, if the wire length is secured and the resistance value can be easily set, the superconducting windings Wa and Wb may be formed into arbitrary shapes. You may comprise a superconducting member. Further, the superconducting windings Wa and Wb have an induction winding configuration, but may have a non-induction winding configuration as described later.

Ha and Hb are superconducting windings Wa and W
b, and constitutes simulated switches Sa and Sb in cooperation with the superconducting windings Wa and Wb. That is, the heaters Ha and Hb generate a temperature exceeding the critical temperature of the superconducting windings Wa and Wb, thereby causing the superconducting windings Wa and Wb to function as resistors and opening the superconducting switches 5a and 5b. ing.

Reference numeral 6A denotes a heater power supply for supplying power to the heaters Ha and Hb in the superconducting switches 5a and 5b. The power supply to the heaters Ha and Hb is selectively performed according to the driving state of the superconducting coil 10A.

Next, the operation of the third embodiment of the present invention shown in FIG. 3 will be described. First, the superconducting coil 10A
Before the current is supplied to the heater H, the heater power supply 6A
a and Hb, the superconducting switch 5
Release a and 5b.

That is, the superconducting switches 5a and 5b
After breaking the superconducting state of the superconducting windings Wa and Wb inside and making the superconducting windings Wa and Wb function as resistors,
A current is supplied from the power supply 3 to the superconducting coil 10A.

Here, the superconducting winding Wa in the quench state
If the resistance values of Wb and Wb are set in the same manner as the above-described balance resistors 4a and 4b (see FIG. 14), when the current is supplied from power supply 3 to superconducting coil 10A, the current distribution is obtained by the same effect as described above. Can be equalized.

After the current is thus supplied,
The thermal type superconducting switches 5a and 5b are closed. That is, the power supply from heater power supply 6A to heaters Ha and Hb is cut off to bring superconducting windings Wa and Wb into a superconducting state.

Thus, superconducting windings Wa and Wb
The extra Joule loss in (balance resistor component) is eliminated. In addition, the superconducting switches 5a and 5b of the thermal type using the critical temperatures of the superconducting windings Wa and Wb have an advantage that they are used in many cases and open / close operations are reliably performed.

Further, since superconducting windings Wa and Wb in superconducting switches 5a and 5b are formed by induction windings, the self-inductance values of superconducting windings Wa and Wb can be set relatively large. . Therefore, the rise of current at the time of power supply to superconducting coil 10A becomes gentle, and the load on power supply 3 can be suppressed.

Embodiment 4 FIG. In the third embodiment, the superconducting switches 5a and 5b are opened and closed by a thermal method. For example, by applying a magnetic field to a superconducting member connected in series to each of the wires 2a and 2b, the superconducting switches 5a and 5b You may comprise so that it may be quenched and open / close operation.

FIG. 4 is an equivalent circuit diagram showing a fourth embodiment of the present invention in which superconducting switches 5a and 5b are formed by a magnetic field method. In FIG. 4, 10B is as described above (see FIG. 3).
, And 2a, 2b,
3, 5a and 5b are the same as described above. In this case, the superconducting windings Wa and Wb are made of a material that easily quench at a low magnetic flux density and generates a stable resistance value at the time of quench.

La and Lb are superconducting windings Wa and W
b, the excitation coil is disposed close to the superconducting winding Wa.
The superconducting switch is opened by generating a magnetic flux exceeding the critical magnetic flux density of Wb and Wb.
6B is an exciting coil L in superconducting switches 5a and 5b.
This is a power supply for excitation for supplying power to a and Lb, and selectively excites according to the driving state of superconducting coil 10A.

In this case, first, the excitation power supply 6B energizes the excitation coils La and Lb to break the superconducting state of the superconducting windings Wa and Wb to form a resistor.
Superconducting switches 5a and 5b in superconducting coil 10B
Open.

In this state, the superconducting coil 10
If a current is supplied to B, the current distribution can be equalized as described above. Subsequently, the power supply from the excitation power supply 6B to the excitation coils La and Lb is interrupted, and the superconducting winding W
The superconducting switches 5a and 5b are closed by setting a and Wb to the superconducting state.

Therefore, as described above, superconducting winding W
Extra Joule losses at a and Wb are eliminated. Also, the magnetic field type superconducting switches 5a and 5b using the critical magnetic flux densities of the superconducting windings Wa and Wb do not take much time when applying a magnetic field. doing.

Embodiment 5 FIG. In the second embodiment, the specific configuration of the superconducting switches 5a1, 5a2 and 5b1 and 5b2 is not particularly described.
For example, a thermal system may be used as in the third embodiment (see FIG. 3).

FIG. 5 shows superconducting switches 5a1, 5a2, 5a.
FIG. 13 is an equivalent circuit diagram showing a fifth embodiment of the present invention in which b1 and 5b2 are configured by a thermal method.
Corresponds to the superconducting coil 20 described above (see FIG. 2), and 2a, 2b and 3 are the same as those described above.

Further, Wa1 and Wa2 correspond to the superconducting winding Wa described above (see FIG. 3), Wb1 and Wb2 correspond to the superconducting winding Wb, Ha1 and Ha2 correspond to the heater Ha, and Hb1 and Hb2 correspond to the heater Ha. 6A1 and 6A2 correspond to the heater power supply 6A.

Superconducting winding Wa connected in series to strand 2a
1 and Wa2 are simulated resistors Ra1 and R2 in FIG.
a2, a superconducting winding W connected in series to the strand 2b
b1 and Wb2 correspond to the simulated resistors Ra2 and Rb2.

Each superconducting switch 5a1, 5a2, 5b1
And heaters Ha1, Ha2, Hb1 and Hb2 in the superconducting windings Wa1, Wa2 and Wb, respectively.
It is arranged close to b1 and Wb2. One heater power supply 6A1 drives the heaters Ha1 and Hb1,
The other heater power supply 6A2 is connected to the heaters Ha2 and Hb.
2 is driven.

Next, the operation of the fifth embodiment of the present invention shown in FIG. 5 will be described. First, when power is supplied from the power supply 3 to the superconducting coil 20A, similarly to the third embodiment, the heater power supplies 6A1 and 6A2
a1, Ha2, Hb1 and Hb2 are energized.

Thus, the superconducting windings Wa1, Wa2,
Since Wb1 and Wb2 are heated above the critical temperature and superconducting switches 5a1, 5a2, 5b1 and 5b2 are opened, the current distribution in superconducting coil 20A is equalized.

Subsequently, after the current distribution in the superconducting coil 20A is equalized, the power supply to the heaters Ha1, Ha2, Hb1 and Hb2 is cut off, and the superconducting switch 5a
1, 5a2, 5b1 and 5b2 are closed. In this case, the current distribution is easily and precisely equalized in the same manner as in the second embodiment, and the opening and closing operation is reliably performed as in the third embodiment.

Embodiment 6 FIG. In the fifth embodiment, the superconducting switches 5a1, 5a2 and 5b1 and 5b2 are formed by a thermal method. However, in the fourth embodiment (FIG.
(See Reference)).

FIG. 6 shows superconducting switches 5a1, 5a2, 5a
FIG. 13 is an equivalent circuit diagram showing a sixth embodiment of the present invention in which b1 and 5b2 are configured by a magnetic field method.
B corresponds to the superconducting coil 20A described above (see FIG. 5), and 2a, 2b, 3, Wa1, Wa2, Wb1, and Wb2 are the same as those described above.

Further, La1 and La2 correspond to the exciting coil La in FIG. 4, Lb1 and Lb2 correspond to the exciting coil Lb, and 6B1 and 6B2 correspond to the exciting power supply 6B.

Each superconducting switch 5a1, 5a2, 5b1
Exciting coils La1, La2, Lb1 and Lb2 in the superconducting windings Wa1 and Wa, respectively, in
2, Wb1 and Wb2. One excitation power supply 6B1 drives the excitation coils La1 and Lb1, and the other excitation power supply 6B2 supplies the excitation coil La2.
And Lb2.

Next, the operation of the sixth embodiment of the present invention shown in FIG. 6 will be described. First, when power is supplied from the power supply 3 to the superconducting coil 20B, the excitation power supplies 6B1 and 6B2 energize the excitation coils La1, La2, Lb1 and Lb2.

Thus, the superconducting windings Wa1, Wa2,
A magnetic flux higher than the critical magnetic flux density is applied to Wb1 and Wb2, and superconducting switches 5a1, 5a2, 5b1 and 5b
2, the current distribution in the superconducting coil 20B is equalized.

Subsequently, after the current distribution in the superconducting coil 20B is equalized, each of the exciting coils La1, La2, Lb
1 and Lb2 are cut off, and the superconducting switch 5
a1, 5a2, 5b1 and 5b2 are closed. In this case, the current distribution is easily and precisely equalized as in the second embodiment, and the opening and closing operation is speeded up as in the fourth embodiment.

Embodiment 7 FIG. In the third embodiment, the case where the superconducting windings Wa and Wb of the induction winding are used as the superconducting members in each of the superconducting switches 5a and 5b has been described. , A non-conducting superconducting winding may be used.

FIG. 7 is an equivalent circuit diagram showing a seventh embodiment of the present invention using a non-inductive winding superconducting winding. In FIG. 7, reference numeral 10C denotes a superconducting coil 10 described above (see FIG. 3).
A, 2a, 2b, 3, 5a, 5b, H
a, Hb and 6A are the same as described above.

WA and WB are superconducting windings of non-induction winding. Unlike the superconducting windings Wa and Wb described above,
It has no inductance component. Therefore, the self-inductance values of superconducting windings WA and WB are set smaller than superconducting windings Wa and Wb of induction winding.

In this case, when the power is supplied to superconducting coil 10C, the current rises sharply, and the current distribution can be equalized at high speed.

Embodiment 8 FIG. In the seventh embodiment, the case where the superconducting switches 5a and 5b are of the thermal type has been described. However, the non-induction winding may be applied to the case of the magnetic field type as in the fourth embodiment (see FIG. 4). Can be.

FIG. 8 is an equivalent circuit diagram showing an eighth embodiment of the present invention in which a non-inductive winding superconducting winding is used in a magnetic field method. In FIG. 8, reference numeral 10D denotes a superconducting coil 10B described above (see FIG. 4). And 2a, 2b, 3,
5a, 5b, La, Lb and 6B are the same as described above.

WA and WB are as described above (see FIG. 7).
This is a superconducting winding of the same non-inductive winding. Again,
The self-inductance values of the superconducting windings WA and WB are
Since it is set smaller than the superconducting windings Wa and Wb of the induction winding, the current distribution of the superconducting coil 10D can be equalized at high speed.

The non-induction winding superconducting windings WA and W
B can be applied to the fifth embodiment (see FIG. 5) and the sixth embodiment (see FIG. 6), and it is needless to say that the same effect as that of the seventh and eighth embodiments is obtained.

Embodiment 9 In the third embodiment, the heaters Ha and Hb are individually provided for the superconducting windings Wa and Wb. However, a single heater is shared for each superconducting winding Wa and Wb, The switch may be integrated.

FIG. 9 is an equivalent circuit diagram showing a ninth embodiment of the present invention in which a superconducting switch is integrated, and FIG.
10E is the superconducting coil 1 described above (see FIG. 3).
0A, and 2a, 2b, 3, Wa, Wb and 6A are the same as described above.

5 is an integrated superconducting switch,
It corresponds to each of the above-described superconducting switches 5a and 5b, and has a single heater H that is commonly and closely disposed near each of the superconducting windings Wa and Wb. Superconducting switch 5 has a single winding frame (not shown), and superconducting winding W
a and Wb are wound around a single bobbin, and the heater H is attached to the single bobbin.

In this case, superconducting windings Wa and Wb are wound around a single winding frame of superconducting switch 5, and
Since the heater H is attached, the superconducting switch 5 can be downsized, and the entire superconducting coil device can be downsized.

Embodiment 10 FIG. The ninth embodiment
In the above, the case where the superconducting switch 5 is of the thermal type has been described. However, even in the case of the magnetic field type as in Embodiment 4 (see FIG. 4), the superconducting switch of the integrated configuration can be applied.

FIG. 10 is an equivalent circuit diagram showing a tenth embodiment of the present invention in which a superconducting switch is integrally formed in a magnetic field system. In FIG. 10, 10D corresponds to the superconducting coil 10B described above (see FIG. 4). 2a, 2a
b, 3, 5, Wa, Wb and 6B are the same as described above.

The integrated superconducting switch 5 has a single excitation coil L which is commonly and closely disposed near each superconducting winding Wa and Wb. As described above, superconducting windings Wa and Wb are wound around a single bobbin of superconducting switch 5, and exciting coil L is mounted on a single bobbin.

Also in this case, since the superconducting windings Wa and Wb are wound around the single winding of the superconducting switch 5 and the exciting coil L is attached, the superconducting switch 5 and the entire superconducting coil device are reduced in size. Can be

Embodiment 11 FIG. In each of the first to eleventh embodiments, the case has been described in which the element wires 2a and 2b that are connected in parallel to form the superconducting coil are each composed of a single element wire. It can be applied when it consists of lines.

In this case, superconducting switches 5a and 5b, which are relatively easy to connect to power supply 3, may be provided at one end of each of the series-connected strand groups. FIG. 11 is an equivalent circuit diagram schematically showing an eleventh embodiment in which a superconducting switch is installed at an end of a group of serial strands.

In FIG. 11, 10G corresponds to the superconducting coil 10 described above (see FIG. 1), and 2a1 and 2a2
Corresponds to the strand 2a, 2b1 and 2b2 correspond to the strand 2b, and 3, 5a, 5b, Sa, Sb, Ra and Rb are the same as those described above.

Here, two wires 2a1 and 2a2 are connected in series in relation to superconducting switch 5a, and two wires 2b1 and 2b2 are connected in relation to superconducting switch 5b.
Although the case where b2 is connected in series is shown, in practice, a plurality of arbitrary strands are connected in series.

In this case, the superconducting switch 5a is connected to the ends of the series-connected wires 2a1 and 2a2 (in FIG. 11,
Superconducting switch 5b installed at one end of the strand 2a1)
Are installed at the ends of the wires 2b1 and 2b2 connected in series (in FIG. 11, one end of the wires 2b1).

Generally, a current supply lead (not shown) is interposed between the two ends of the superconducting coil 10G in the cryostat and the power supply 3 in the normal temperature environment. The connection between 5b and the current supply lead has a relatively high resistance value when the superconducting switches 5a and 5b are opened, so that the variation in the connection resistance value is easily suppressed, and a normal conductor connection or the like is used.

However, the connection between the wires 2a1, 2a2, 2b1 and 2b2 in which the superconducting state is ensured and the current supply lead is extremely low because the wires 2a1, 2a2, 2b1 and 2b2 have extremely low resistance. In spite of the difficulty in suppressing the variation in the value, it is strictly required to suppress the connection resistance value.

Therefore, superconducting switches 5a and 5a
b is connected to one end of the strand group 2a1 and 2a2, respectively.
If it is installed at one end of the wire groups 2b1 and 2b2, at least at one end of the superconducting coil 10G, the connection between the superconducting coil 10G and the current supply lead is facilitated. Can be easier.

Embodiment 12 FIG. In the first embodiment,
In FIG. 1, for the purpose of facilitating the connection operation between the superconducting coil 10G and the power supply 3, the superconducting switches 5a and 5b are connected to the element groups 2a1 and 2a2 connected in series.
And 2b1 and 2b2 are installed at one end of each, but for the purpose of equalizing the current distribution in the superconducting coil,
The superconducting switches 5a and 5b may be provided between the wire groups 2a1 and 2a2 and between the wire groups 2b1 and 2b2.

FIG. 12 is an equivalent circuit diagram showing a twelfth embodiment of the present invention in which a superconducting switch is provided between strands connected in series. In FIG. 12, reference numeral 10H denotes a superconducting circuit as described above (see FIG. 11). 2a corresponding to coil 10G
1, 2a2, 2b1 and 2b2, 3, 5a, 5b, S
a, Sb, Ra and Rb are the same as described above.

In this case, superconducting switch 5a is installed between serially connected strands 2a1 and 2a2, and superconducting switch 5b is connected between serially connected strands 2b1 and 2b2.
Since it is provided between b2, the current distribution of each series circuit in superconducting coil 10H can be more easily and precisely equalized.

In the eleventh and twelfth embodiments, taking the case where the present invention is applied to superconducting coil device 10 of FIG. 1 as an example, each of wire groups 2a1 and 2a2 and 2b1
And 2b2, one superconducting switch 5a and 5b is installed. However, the present invention is applied to the superconducting coil device 20 of FIG. 2 and a plurality of superconducting switches 5a1, 5a2, 5b1 are provided.
And 5b2 may be installed.

In this case, for example, superconducting switch 5a
1 and 5a2 are installed at both ends of the wires 2a1 and 2a2, and the conductive switches 5b1 and 5b2 are installed at both ends of the wires 2b1 and 2b2, so that the connection between the wire of the superconducting coil and the current supply lead is unnecessary. Therefore, the connection work with the power supply 3 can be further facilitated.

The superconducting switches 5a1 and 5a
2 are equally disposed between the wires 2a1 and 2a2, and the superconducting switches 5b1 and 5b2 are connected to the wires 2b
If they are arranged evenly between 1 and 2b2, the distribution of current flowing in the superconducting coil can be further equalized.

[0108]

As described above, according to the first aspect of the present invention, a superconducting coil including a plurality of wires connected in parallel and wound, and a power supply for supplying power to the superconducting coil are provided. In the superconducting coil device, a superconducting switch showing a predetermined resistance value when opened is connected in series for each element wire, and after the current has been supplied, the superconducting switch is closed to make the resistance value zero, so that the balance is made. In addition to suppressing the consumption of liquid helium due to excess Joule loss in the resistor portion, the current distribution of each strand can be easily equalized, and a highly stable superconducting coil device can be obtained.

According to a second aspect of the present invention, in the first aspect, the superconducting switch includes a plurality of superconducting switches connected in series with each other, so that the current value of each strand is suppressed. There is an effect that a superconducting coil device that can easily make the current distribution uniform can be obtained.

According to a third aspect of the present invention, in the second aspect, the weights are set so that the resistance values of the plurality of superconducting switches in the superconducting switch are different from each other and can be finely adjusted. In addition, there is an effect that a superconducting coil device that can make the current distribution uniform with higher accuracy can be obtained.

According to a fourth aspect of the present invention, in each of the first and second aspects, each of the superconducting switches is opened and closed by a thermal method. A superconducting coil capable of reliably operating the superconducting switch because the heater generates a temperature exceeding the critical temperature of the superconducting member to open the superconducting switch. There is an effect that the device can be obtained.

According to a fifth aspect of the present invention, in each of the first and second aspects, each of the superconducting switches is opened and closed by a magnetic field method. An exciting coil disposed close to the member, and the exciting coil generates a magnetic flux exceeding a critical magnetic flux density of the superconducting member, thereby opening the superconducting switch, so that the superconducting switch can be operated at high speed. There is an effect that a superconducting coil device can be obtained.

According to the sixth aspect of the present invention, in the fourth or fifth aspect, the superconducting member in each superconducting switch is constituted by a non-inductive winding superconducting winding, so that the current can be increased at a high speed. There is an effect that a superconducting coil device capable of equalizing the distribution can be obtained.

Further, in the superconducting coil device according to claim 7 of the present invention, since the superconducting member in each superconducting switch is constituted by a superconducting winding of induction winding in claim 4 or 5, This makes it possible to obtain a superconducting coil device capable of suppressing the load on the power supply.

Further, in the superconducting coil device according to claim 8 of the present invention, in claim 4, the superconducting switch has a single winding frame, and the superconducting member is constituted by a superconducting winding and wound around the winding frame. In addition, since the heater is attached to the bobbin, there is an effect that a superconducting coil device in which the superconducting switch unit is integrated and which is reduced in size is obtained.

According to a ninth aspect of the present invention, in the superconducting coil device according to the fifth aspect, the superconducting switch has a single bobbin, and the superconducting member is formed of a superconducting winding and wound around the bobbin. In addition, since the exciting coil is mounted on the bobbin, there is an effect that a superconducting coil device in which the superconducting switch unit is integrated and which is reduced in size is obtained.

A superconducting coil device according to a tenth aspect of the present invention is the superconducting coil device according to the first or second aspect, wherein the superconducting coil includes a plurality of windings connected in series and wound with each other, and Since it is installed at one end of the group of strands connected in series, there is an effect that a superconducting coil device that facilitates the work of connecting to a power supply can be obtained.

Further, in the superconducting coil device according to claim 11 of the present invention, the superconducting coil according to claim 1 or 2 includes a plurality of element wires connected in series with each other and wound, and the superconducting switch is Since a plurality of wires connected in series are provided between the wires, a superconducting coil device capable of more easily and precisely equalizing the current distribution can be obtained.

A superconducting coil device according to a twelfth aspect of the present invention is the superconducting coil device according to any one of the first to eleventh aspects, wherein the superconducting switch connected in series to each element wire is:
Since they are configured to work together, there is an effect that a superconducting coil device that facilitates equalization of current distribution and suppression of current value after energization is easily obtained.

[Brief description of the drawings]

FIG. 1 is an equivalent circuit diagram showing a first embodiment of the present invention.

FIG. 2 is an equivalent circuit diagram showing a second embodiment of the present invention.

FIG. 3 is an equivalent circuit diagram showing a third embodiment of the present invention.

FIG. 4 is an equivalent circuit diagram showing a fourth embodiment of the present invention.

FIG. 5 is an equivalent circuit diagram showing a fifth embodiment of the present invention.

FIG. 6 is an equivalent circuit diagram showing a sixth embodiment of the present invention.

FIG. 7 is an equivalent circuit diagram showing a seventh embodiment of the present invention.

FIG. 8 is an equivalent circuit diagram showing an eighth embodiment of the present invention.

FIG. 9 is an equivalent circuit diagram showing a ninth embodiment of the present invention.

FIG. 10 is an equivalent circuit diagram showing a tenth embodiment of the present invention.

FIG. 11 is an equivalent circuit diagram showing an eleventh embodiment of the present invention.

FIG. 12 is an equivalent circuit diagram showing a twelfth embodiment of the present invention.

FIG. 13 is an equivalent circuit diagram showing a conventional superconducting coil device.

FIG. 14 is an equivalent circuit diagram showing another example of a conventional superconducting coil device.

[Explanation of symbols]

2a, 2b, 2a1, 2a2, 2b1, 2b2 strand,
3 power supply, 5, 5a, 5b, 5a1, 5a2, 5b1,
5b2 superconducting switch, 6A, 6A1, 6A2 heater power supply, 6B, 6B1, 6B2 excitation power supply, 10,
10A to 10H, 20, 20A, 20B Superconducting coil, H, Ha, Hb, Ha1, Ha2, Hb1, Hb2
Heaters, L, La, Lb, La1, La2, Lb1,
Lb2 Excitation coil, Wa, Wb, Wa2, Wb2 Superconducting winding.

Claims (12)

[Claims] 1. A superconducting coil device comprising: a superconducting coil including a plurality of wires wound in parallel and wound; and a power supply for supplying power to the superconducting coil. A superconducting coil device, wherein a superconducting switch sometimes showing a predetermined resistance value is connected in series. 2. The superconducting coil device according to claim 1, wherein the superconducting switch includes a plurality of superconducting switches connected in series to each other. 3. A superconducting switch in the superconducting switch, wherein the resistance values of the superconducting switches are different from each other and are weighted so as to be finely adjustable.
3. The superconducting coil device according to claim 1. 4. Each of the superconducting switches includes a superconducting member connected in series to the strand and a heater disposed in close proximity to the superconducting member so as to open and close in a thermal manner. 3. The superconducting coil device according to claim 1, wherein the superconducting switch is opened by generating a temperature exceeding a critical temperature of the superconducting member. 5. Each of the superconducting switches includes a superconducting member connected in series to the element wire and an exciting coil disposed close to the superconducting member so as to open and close by a magnetic field method. 3. The superconducting coil device according to claim 1, wherein the superconducting switch is opened by generating a magnetic flux exceeding a critical magnetic flux density of the superconducting member. 6. The superconducting coil device according to claim 4, wherein the superconducting member is constituted by a non-conducting superconducting winding. 7. The superconducting coil device according to claim 4, wherein the superconducting member is constituted by an induction-conducting superconducting winding. 8. The superconducting switch has a single bobbin, the superconducting member is constituted by a superconducting winding and wound around the bobbin, and the heater is attached to the bobbin. The superconducting coil device according to claim 4, wherein: 9. The superconducting switch has a single bobbin, the superconducting member is constituted by a superconducting winding and wound around the bobbin, and the exciting coil is attached to the bobbin. The superconducting coil device according to claim 5, wherein 10. The superconducting coil includes a plurality of strands connected and wound in series with each other, and the superconducting switch is installed at one end of the strands connected in series. The superconducting coil device according to claim 1 or 2, wherein: 11. The superconducting coil includes a plurality of wires connected and wound in series with each other, and the superconducting switch is installed between the plurality of wires connected in series. The superconducting coil device according to claim 1 or 2, wherein 12. The superconducting coil device according to claim 1, wherein the superconducting switches connected in series to the respective wires are configured to work together.