Superconducting coil

 

(57) Abstract:

Use: equipment heavy duty magnetic fields. The inventive superconducting coil includes a tightly wound coil of superconducting wire, a vessel with a cooling medium and isolating the elements, while the two end surfaces of the winding coils have a higher limit of stability of superconductivity in comparison with the rest of the winding which is placed inside of the vessel with a cooling medium, the insulating elements are placed between the coil and the vessel. Effect: improved stability. 2 S. and 6 C.p. f-crystals, 6 ill.

The invention relates to a superconducting coil, which increased the stability of the tightly wound superconducting coils and increased resistance to suppression of superconductivity.

As a method to prevent the loss of superconductivity coil due to perturbations in the surface part of the wound wire in a tightly wound superconducting coil known method, comprising installing pruginin elements of the superconducting coil and the vessel for the coil (application of Japan JP-A-1-194308) containing a cooling medium to prevent loss surpr vibration. There are also known methods, which consists in the introduction of a material with low coefficient of friction between the superconducting coil and the insulating material placed on the inner surface of the vessel for the coil, to reduce heating due to friction (application of Japan JP-A-57-124406 and JP-A-57-178306); method, which consists in placing at a given distance from each other on the surface of the superconducting coil insulating elements containing insulator with a low friction coefficient and low thermal conductivity, which are attached to the vessel coils, to prevent suppression of superconductivity due to the transfer of heat generated by friction, from the surface coil (application of Japan JP-A-57-638099); the method comprising attaching the superconducting coil to the inner vessel by means of a metal tube through which flows a cryogenic environment, to prevent suppression of superconductivity due to the transfer of heat generated by friction from the surface of the superconducting coil (application of Japan JP-A-57-63809), etc.

Also known superconducting coil containing the winding of the superconducting wire, the channel for the cooling medium, the inner vessel, an insulating partition (abstracts of conference "Transport in magnetic suspensions - 85", S. 185-192, (1985).

The essence of all the above known methods consists in weakening of the perturbation, leading to the suppression of superconductivity coil, or the creation of obstacles to the transfer of heat generated by perturbations to the superconducting coil. However, the real resistance to the suppression of superconductivity tightly wound superconducting coil is almost not increased. Thus, none of the known methods cannot yet be considered as sufficient to prevent the suppression of superconductivity in superconducting coil.

An object of the invention is the creation of a superconducting coil, which increased the stability of the tightly wound superconducting coils and increased resistance to suppression of superconductivity.

The technical solution according to the invention is provided by a superconducting coil, containing a tightly wound coil of superconducting wire in which there is no direct contact of the cooling medium with superconducting wire, a vessel with a cooling medium and isolating the elements, while the two end surfaces of the winding coils have a higher limit of stability of superconductivity in sravnenie between the coil and the vessel.

As a stabilizer for the superconducting wire can be used copper, while the superconducting wire can be covered with aluminum.

The cross-section of the superconducting wire in the two end surfaces of the winding of the coil may be greater than in the rest of the winding.

The coil winding may contain not connected superconductors with different stability limits for the upper part of the winding and for the rest of the winding, respectively.

According to another aspect of the invention the superconducting coil includes a tightly wound coil of superconducting wire in which there is no direct contact of the cooling medium with superconducting wire, a vessel with a cooling medium and isolating the elements, while the surface portion of the coil has a higher limit of stability compared to the rest of the winding which is placed inside of the vessel with a cooling medium, the insulating elements are placed between the coil and the vessel.

As a stabilizer for the superconducting wire in the upper part of the winding coil can be used copper, while the superconducting wire can be covered with aluminum.

In Fig. 1 shows the structure of a superconducting coil corresponding to one variant of the present invention, the cross-section of Fig. 2 - design of the superconducting coil, corresponding to another variant of the present invention, the cross-section of Fig. 3 - design of superconducting coils corresponding to one variant of the present invention, the cross-section of Fig. 4 - design of the superconducting coil corresponding to one variant of the present invention, the cross-section of Fig. 5 is a perspective representation of the General shape of a conventional superconducting coil in the form of a race track; Fig. 6 is a view in transverse section along the line a-a in Fig. 5.

Before proceeding to the description of the variants of the present invention, explain the principle.

Superconducting magnetic suspension for a vehicle includes a superconducting coil located on the vehicle, and normally conductive closed-circuited coils laid in the ground, thus lifting the vehicle is due to repulsive forces arising due to electromagnetic induction between sverhromantichno tool is created using linear synchronous motor using the interaction between a normally conductive traction coils, laid separately from each other into the ground, and superconducting coils arranged on the vehicle, making the same coils provide traction by inverting the current flowing through the traction coils.

The superconducting coil is used for the vehicle on the superconducting Maglev, usually has the shape of a race track (see Fig. 5), however, since it is installed on the vehicle, for reasons of economy of its size and weight should be as minimal as possible.

For this purpose, the winding of the superconducting coil should have a more compact form, to increase the current density in the coil. In this regard, applied design with a tightly wound coil in which a cooling medium such as liquid helium, and so on, is in the space 3 limited vessel 1 for the cooling medium and the insulator 2, so that the winding 4 of the superconducting coil there is no direct contact of the cooling medium with the superconductor. It also uses the so-called superconducting wire with a small volume ratio of copper to superconductor makes it possible to reduce the volume of the part not oasa coil for vehicle Maglev should have high reliability and stability as the latter must ensure the safe transportation of passengers. Therefore, the limit of stability of the superconducting coil must be higher than the energy of the perturbations. The stability limit is determined by the lowest energy, which leads to suppression of the superconductivity of the superconducting coil. Unfortunately, tightly wound superconducting coil with a small volume ratio of copper to superconductor has a low limit of resistance and superconductivity can be suppressed small energy perturbations.

Thus, when the vehicle Maglev high-speed superconducting coil is in adverse operating conditions, experiencing shock loads associated with fluctuations due to mechanical vibration, tunnelling, oncoming vehicles, etc. and energy complex perturbations due to wind pressure, vibration, etc. While it is almost impossible to establish which part of the winding coil is suppressed superconductivity, and not developed not only theory, but also any specific measures to ensure the sustainability of tightly wound superconducting coil during movement of the vehicle.

Namely, it was found that the resistance to the suppression of the superconductivity of the superconducting coil can be increased significantly by increasing the limit of stability only in the surface part of the winding, in order to prevent the suppression of superconductivity due to the loss of its surface coil section.

Specifically, you can increase the resistance to the suppression of superconductivity superconducting coil by increasing the limit of stability in the two extreme parts of the winding coil compared to the limit of stability of the rest of the winding coil.

In addition, you can also significantly increase the resistance to the suppression of superconductivity superconducting coil by increasing the limit of stability of the entire surface of winding of the coil to prevent the suppression of superconductivity due to the loss of part of its surface winding.

As a measure to change the limit of stability of the surface and the rest of the winding of the coil there is a way in which the change amount of the stabilizer used in the superconducting wire. This can be achieved is the principal section of the superconducting wire in the remaining part. This can also be achieved by introducing aluminum positively high purity.

On the other hand, as measures to increase the resilience of the upper part of the winding coil is not necessary to use superconducting wire with high tensile resistance for the upper part of the winding, it is possible to increase the tensile resistance of the surface winding through any other measures, if they lead to the same result. This idea is based other aspects of the invention, according to which the stability limit for the upper part of the winding and the other part can be changed by wrapping a normal metal, such as copper, aluminum and so on, around the upper part of the winding of the superconducting coil.

Superconducting coil for vehicle Maglev experiencing fluctuations caused by electromagnetic force or a mechanical vibration when driving at high speed, it is acted shock loads due to tunnelling, oncoming vehicles, etc., and various disturbances due to wind pressure, vibration, etc. of the Internal and superficial parts of the winding coils are considered as designated in the superconducting provideany structure and impregnated with epoxy resin, fluctuations of the superconducting wire due to electromagnetic forces, etc. can be largely suppressed. Therefore, the loss of superconductivity is unlikely to occur due to fluctuations of the superconducting wire. At the same time, the surface of the winding coil can lose superconductivity due to thermal perturbations generated by the friction between the insulator and coil.

Consequently, it is possible to significantly increase the resistance to the suppression of superconductivity superconducting coil by hanging the limit of stability of the entire surface of winding of the coil to prevent the suppression of superconductivity due to the loss of its surface part of the winding coil.

The cross-section of the winding of the superconducting coil for vehicles on magnetic suspension generally has a rectangular shape (see Fig. 6). The coil 4 coil can be roughly divided into two extreme parts 7 of the winding coil and the remaining portion 5 of the winding coil. Suppression of superconductivity in superconducting coil of the vehicle Maglev moving at a high speed can be prevented by increasing the limit of stability of the winding coil is ture to change the limit of stability of the surface and the rest of the winding of the coil there is a way consisting in the change of the amount of stabilizer used in the superconducting wire. This can be achieved by increasing the cross section of the superconducting wire in the upper part compared with the cross-section of the superconducting wire in the remaining part. This can also be achieved by introducing aluminum positively high frequency. Because the electrical resistivity of aluminum of high purity approximately 1/10 times lower than the electrical resistivity of copper of high purity with extremely low temperature, and its thermal conductivity is approximately 6.4 times higher than thermal conductivity of copper of high purity, overheating is unlikely to occur. Moreover, aluminum has excellent properties for stabilizer, since it is so light compared to copper due to its low specific weight, etc. So you can locally increase the tensile resistance by coating the surface of the superconducting wire stabilizer, which is copper, the required amount of aluminum of high purity.

When the superconducting coil is operating in continuous mode current, as in the vehicle Maglev, A coil was not connecting parts of the superconducting wire. This can be achieved by covering the surface of the superconducting wire without connecting parts, stabilizer, which is copper, the required amount of aluminum of high purity.

Introducing a rectangular coordinate system with origin at the center of the superconducting coil, the x-axis in the direction of movement of the vehicle, the z-axis in the upward direction, in the vehicle Maglev when it moves at high speed, the superconducting coil, between it and the coil in the ground, force thrust (Fx), the guiding force (Fyand force directed upwards and downwards (Fz). On the other hand, as the moments around the x, y and z has the time of roll (Mxthe pitch moment (My) and yawing moment (Mz) respectively. When analyzing acting on the superconducting coil and the forces and moments generated by the current induced suspended coil when the vehicle Maglev with a constant speed of 500 km/h, were found to have the following average ratios between them: Fx: Fy: Fz=1 : 0,9 : 2,4 Mx: My: Mz= 1: 2,1 : 1,4. As you can see, they are all the same order of magnitude. As a result, swarp tuski relative to the vessel coils, resulting in friction. Thus, it was clear that due to the friction generated by the amount of heat one order of magnitude in all the superficial parts of the winding coil, as described above. Thus, in order to provide a more stable movement of the vehicle Maglev, it is preferable to increase the limit of stability throughout the superficial parts of the winding coil.

In Fig. 1 shows a view in cross section showing the structure of a superconducting coil in the device corresponding to the invention. In Fig. 1, the coil 4 coil consists of the Central part 9 of the winding and the two extreme parts of the winding 8, is attached to the vessel for the cooling medium through the insulating elements 2 and cooled with liquid helium 3, employee of a cooling medium.

Example 1. Were prepared superconducting wire B for the two extreme parts of the winding 8 and the superconducting wire A to the rest of the winding 9 in Fig. 1. Namely, was made one of the superconducting wire A lived from 1748 Nbi each having a diameter of 27 μm, sealed with a step of twisting 21 mm high purity copper in the form of a wire having a rectangular cross-section with an outer size 1,11,9 mm, the surface of the cat is the number of stabilizing copper/number of superconducting substances) was equal to 1.0. Each of the superconducting wires B was manufactured by coating the surface of A superconducting wires described above, a layer of high purity aluminum with a purity of 99,999%, a thickness of 0.3 mm by extrusion so that its outer dimension was 1,72,5 mm, and then isolate it polymide tape with a thickness of 25 μm, wound on its surface, overlapping each turn by 1/2 of its width.

Superconducting coil F was made by winding mentioned superconducting wire and A superconducting wires B in the construction shown in Fig.1, to connect them by soldering so that each of the two extreme parts was the outer layer 4 to obtain a tightly wound circular superconducting coil with an inner diameter of about 100 mm, an outer diameter of about 210 mm, length 90 mm, number of layers 36, the total number of turns 1170 and inductance of about 0,165 G, followed by impregnating it with epoxy resin under vacuum. Cross-section of the thus obtained superconducting coil was made such that its size and cooling conditions were approximately what is required for a superconducting coil for vehicle Maglev. Further, in two of crinale on the length of 1 cm in the longitudinal direction of the wire manganin with silk insulation.

In order to experimentally test the stability of the superconducting coil corresponding to the present invention, was prepared separately tightly wound superconducting coil Q with an inner diameter of 100 mm, an outer diameter of 192 mm, a length of 68 mm, number of layers 36, the total number of turns 1170 and inductance 0,163 G, which was made using only A superconducting wires described above, with the volume ratio of copper to superconductor 1,0, wound and impregnated with epoxy resin so as to obtain the characteristics, as it is possible more close to the above-described superconducting coil F. this superconducting coil Q were fixed heaters, similarly to the above-described superconducting coil F.

These superconducting coils F and Q were immersed in liquid helium and excited with direct current. It was possible to excite both coils up to 100% of the magnetic field - critical characteristics of the current of the superconducting wires. Next, to compare the stability of the superconducting wires to the perturbations caused by friction, etc. on the surface of the windings of the coils, the limit of stability was measured when applying for the above heaters superconducting coils F and Q IMCI on the coil 70% for the superconducting coil F was 22 m/cm, and for the superconducting coil Q - 3.0 m/see Thus, it was found that the superconducting coil F, corresponding to the invention has a stability limit is about 7 times higher in comparison with the superconducting coil, the corresponding prototype.

Example 2. Were prepared superconducting wires A and B described in example 1 and in the construction shown in Fig. 2 were wound above the superconducting wire B so that the surface part 10 winding was 4 layer from the surface coil. At the same time, to form part 11, which differs from the surface part 10 winding in Fig. 2, was wrapped and soldered superconducting wire A, and thus was obtained a superconducting coil R which is almost identical to the superconducting coil F in example 1, which was treated similarly to the last. In the surface portion of the winding were also mounted heaters, similar to that described in example 1. The same method that was used in example 1 were carried out measurement of the limit of stability, and was received limit of stability, almost equal to the limit of stability of the superconducting coil F described in example 1.

Example 3. Veins 652 NbTi, each having a diameter of 45 μm were sealed with a step size 1,922,8 mm and the surface isolated by polyvinylformal thickness of 40 μm. The way was prepared separately superconducting wire C to volume ratio of copper to superconductor 3,9.

Through the use of superconducting wires A, described in example 1 for the Central part 11 of Fig. 2 and the superconducting wires described above, for the surface part 10 winding was made of the superconducting coil R' with almost the same characteristics as the coil described in example 1. In this superconducting coil R' were also built into the heaters are the same as in example 1.

In the same way as in example 1, for the above coil R' was measured by the ratio of the current load on the coil 70% of the limit of stability, which amounted to about 7.8 m/see Thus, it was found that this coil has a limit of stability of approximately 2.4 times higher in comparison with the superconducting coil Q, performed with the use of superconducting wire And with volume ratio of copper to superconductor 1.0 and described in example 1.

Example 4. Superconducting wire D which is not connected in the longitudinal direction and covered with a layer of aluminum of high-frequency thickness of 0.3 mm was pre-wound in the of avemus in example 1, to obtain the same characteristics as a superconducting coil F. he was Then impregnated with epoxy resin under vacuum. Thus was obtained a superconducting coil's almost the same characteristics as the superconducting coil F in example 1. Measurements were carried out of the limit of stability with the use of heaters, similar to the characteristics of the heaters in example 1 and was obtained the limit of stability, almost equal to the limit of stability of the superconducting coil F in example 1.

Then the superconducting coil S and separately made the switch continuous current were connected through the connection superconductivity-superconductivity for the formation of a closed loop and worked in continuous mode current when the current value is 500 And for about 200 h of the Coil worked steadily, without suppression of superconductivity. Was also measured time constant of decay of current during operation, which amounted to about 51011C.

Example 5. Was pre-cooked superconducting wire As described in example 1, and the superconducting wire E which is not connected in the longitudinal direction and covered with a layer of aluminum with high pureness is cnom terms of design, described in example 2, in a manner analogous to that used in example 1. This superconducting wire E was wound to obtain the cross-section design of the coil shown in Fig. 2 in example 2. He was then impregnated with epoxy resin under vacuum to obtain a superconducting coil U with almost the same characteristics as that of the superconducting coil F in example 1. Measurements were carried out of the limit of stability with the use of heaters, similar to the characteristics of the heaters in example 1 and was obtained the limit of stability, almost equal to the limit of stability of the superconducting coil S in example 4. Then the superconducting coil U and separately made the switch continuous current were connected through the connection superconductivity-superconductivity for the formation of a closed loop and worked in continuous mode current when the current value is 500 And for about 200 h of the Coil worked steadily, without suppression of superconductivity. Was also measured time constant of decay of current during operation, and was obtained the same result as in the previous example.

Example 6. Superconducting wire and A superconducting wire B was wrapped connection with the tion coil, as the coil R in example 2, using the same superconducting wires A and B, as in the superconducting coil F described in example 1. They were then subjected to treatment by impregnation to obtain a superconducting coil Y with almost the same characteristics as that of the superconducting coil as described in example 2. Then in this superconducting coil Y were mounted heaters in the same places as in the superconducting coil F. The same way as in example 1, was measured by the tensile resistance of the superconducting coil Y, and was found almost the same magnitude as for the superconducting coil F. the time Constant of decay of the current measured for the superconducting coil Y in the manner described in example 4 was approximately the same as in example 4.

Example 7. Superconducting wire and A superconducting wire B was wrapped with a connection through the connection superconductivity-superconductivity for the same cross-sectional view of the design of the coil as the coil R in example 2, using the same superconducting wires A and B, as in the superconducting coil F described in example 1. They were then subjected to treatment by impregnation to obtain a superconducting coil W will scent the coil W were mounted heaters in the same places, as in the superconducting coil R, The same way as in example 1, was measured by the tensile resistance of the superconducting coil W, and was found almost the same magnitude as for the superconducting coil R. the time Constant of decay of the current measured for this superconducting coil in the manner described in example 4 was approximately the same as obtained for the superconducting coil V in example 4.

Example 8. Was pre-fabricated insulated copper wire with the same outer shape and the same size as the superconducting wire A, is described in detail in example 1. By this winding copper wire in two layers were prepared two identical parts of the winding (13 in Fig. 3) impregnated with epoxy resin. On the other hand, from A superconducting wires described in example 1, was prepared by the coil (12 in Fig. 3) so that it had almost the same characteristics as that of the superconducting coil Q. Coil was mounted together with a copper coil sections described above, so as to form the device shown in Fig. 3. Then by impregnating it with epoxy resin in vacuum was made of the superconducting coil X. Heaters, described in detail in example 1 were similarly VD coil 70%, similarly to the previously described example 1. Described superconducting coil worked steadily, without suppression of superconductivity.

Example 9. Was prepared wire of aluminum of high purity, having the same size as the copper wire used in example 8, and the purity of 99,999%, the surface of which was covered with a polyimide tape with a thickness of 25 μm, wrapped around him, overlapping each turn by 1/2 the width of the tape for insulation of the wire. By using it instead of copper wire of example 8 was manufactured by the superconducting coil V. wire of aluminium of high purity was built heaters, similar that used in example 8. Like in example 1, the heater was supplied energy up to 40 J/cm when the ratio of the current load on the coil 70%. Described superconducting coil worked steadily, without suppression of superconductivity.

Example 10. Was made of copper wire with the same outer shape and the same size as the superconducting wire A, is described in detail in example 1. This copper wire was wound on the armature winding of the coil in two layers (14 in Fig. 4). Then was wound superconducting wire A, is described in detail in example 1, to obtain almost the same character two layers of copper wire (15 in Fig. 4). There were prepared two windings, which was then wrapped in two layers of the above-described copper wire, and which have been impregnated with epoxy resin (13 in Fig. 4). Was made of the superconducting coil by placing them so as to form the device shown in the drawing, and infiltrating it with epoxy resin under vacuum. Heaters, described in detail in example 1 were similarly embedded in a copper coil section. The heater was supplied energy up to 30 J/cm when the ratio of the current load on the coil 70%, similar to the previously described example 1. Described superconducting coil worked steadily, without suppression of superconductivity.

Example 11. Was prepared wire of aluminum of high purity, having the same size as the copper wire used in example 8, and the purity of 99,999%, the surface of which was covered with a polyimide tape with a thickness of 25 μm, wrapped around him, overlapping each turn by 1/2 the width of the tape for insulation of the wire. By using it instead of copper wire in example 10 was fabricated superconducting coil Z'. In the wire of aluminium of high purity were mounted heaters, similar that used in example 8. Like in example 1, in nagri coil worked steadily, no suppression of superconductivity.

Although in examples 8-11 were described variants of the invention, which used copper or aluminum wire, from the normal metal can be replaced by a plate with through holes, made of normal metal, such as copper, aluminum, etc.

As described above, since the present invention allows to realize a compact superconducting coil having a high stability, high reliability and high current density, and vehicle Maglev with its application, the invention provides a significant economic and social effect.

1. Superconducting coil containing a tightly wound coil of superconducting wire in which there is no direct contact of the cooling medium with superconducting wire, a vessel with a cooling medium and isolating elements, characterized in that the two end faces of the winding coils have a higher limit of stability of superconductivity in comparison with the rest of the winding which is placed inside of the vessel with a cooling medium, the insulating elements are placed between the coil and the vessel.

2. Sverchkova on two end surfaces of the winding coil, which used copper and superconducting wire, located on the end surfaces of the winding coil, coated aluminum.

3. Superconducting coil under item 1, characterized in that the cross section of the superconducting wire in the two end surfaces of the winding is greater than in the rest of the winding.

4. Superconducting coil under item 1 or 2, characterized in that it is wound from a continuous superconductor.

5. Superconducting coil containing a tightly wound coil of superconducting wire in which there is no direct contact of the cooling medium with superconducting wire, a vessel with a cooling medium and isolating elements, characterized in that the surface portion of the coil has a higher limit of stability compared to the rest of the winding which is placed inside of the vessel with a cooling medium, the insulating elements are placed between the coil and the vessel.

6. A superconducting coil on p. 5, characterized in that it has a stabilizer stability of superconductivity for superconducting wires placed on the surface of the winding, which used copper, and the superconducting Pro p. 5, characterized in that the cross section of the superconducting wire in the upper part of the winding is greater than in the rest part of the winding.

8. A superconducting coil on p. 5, characterized in that the surface portion of the winding coil made of copper and aluminum.

 

Same patents:

The invention relates to the field of cryogenic electrical engineering, in particular to the design of superconducting coils for electromagnetic devices

FIELD: applied superconductivity.

SUBSTANCE: proposed method that can be used for manufacturing mechanically loaded superconductor windings designed for sustaining conductor stress higher than 100 MPa as well as superconductor windings and devices designed for operation under variable conditions, such as superconducting magnets for charged particle accelerators and superconductor inductive energy storages involves use of liquid epoxy resin as filler doped with finely dispersed powder of rare-earth intermetallide, for instance HoCu2 (holmium-copper) or CeCu2 (cerium-copper). Filler concentration is chosen between 20 and 50% of liquid epoxy resin volume.

EFFECT: enhanced performance characteristics of superconductor windings under variable conditions.

4 cl, 2 dwg

FIELD: high-voltage charged particles accelerators.

SUBSTANCE: device has high-voltage rectifier transformer, including high-voltage transformer, consisting of magnetic duct, rods with primary winding of which are encased in electrostatic screens, sectioned secondary winding, rectifier elements, inserted between sections of secondary winding, accelerator pipe with charged particles source, safety screen, inside safety screen compensation coil is mounted with possible presence of axial component of magnetic field in counter-phase to field vector, moving charged particles beam from accelerator pipe axis. Correction method includes forming by high-voltage rectifier transformer of high-voltage accelerator potential, initiation of charged particles flow in charged particles source, acceleration of charged particles flow in sectioned accelerator pipe, forming of beam of charged particles, while additional magnetic field is formed using compensating coils, mounted on external surface of safety screen.

EFFECT: broader functional capabilities, higher reliability, simplified construction, higher efficiency.

2 cl, 8 dwg

FIELD: applied superconductivity.

SUBSTANCE: proposed composite superconductor that can be used to manufacture superconductors for superconducting windings suffering heavy mechanical loads (at operating pressure across conductor higher than 100 MPa) as well as for superconducting windings and devices operating under variable conditions, such as superconducting inductive energy storage devices, dipole and quadrupole magnets for charged particle accelerators, has superconducting material fibers, matrix of high-conductivity metal, such as copper and rare-earth intermetallide possessing high thermal capacity at low temperatures. Composite superconductor is provided with metal sheath accommodating rare-earth intermetallide; mentioned wires and conductor are welded together. Metal sheath can be made in the form of hollow cylindrical conductor or flat strip with hollow interlayer, their hollow spaces being designed to dispose rare-earth intermetallide. Composite superconductor is made in the form of a few multiple-fiber composite superconducting wires twisted around hollow cylindrical conductor accommodating rare-earth intermetallide. Composite superconductor can be made in the form of flattened single-lay strand of several multiple-fiber composite superconducting wires and several hollow cylindrical conductors of same diameter accommodating intermetallide which alternately vary within strand. Rectangular-section conductor is made of high-conductivity metal and has longitudinal groove.

EFFECT: enlarged functional capabilities.

7 cl, 8 dwg

FIELD: electrical engineering, superconducting electromagnets for their change-over to sustained current operation with the use of detachable current conductor.

SUBSTANCE: the device has a superconducting coil cooled in a vacuum container. The first current conductor is fixed inside the vacuum container. Its one end is connected to the superconducting coil, and the other has a contact section of the wire. The second current conductor passes through a through hole provided in the vacuum container with keeping of leak-proofness. Its one end is connected to the wire line leading to the outer source of exciting current, and its other end has a section of disconnection/connection, it is installed on the contact section of the wire for detachment. The device is made for change over to sustained current operation by means of the current fed from the outer source of exciting current, when the mentioned section of connection/disconnection is in contact with the wire contact section, and can maintain the sustained current operation after its disconnection from the wire contact section.

EFFECT: provided effective, precise and safe connection of the current conductor of the superconducting magnet.

14 cl, 8 dwg

FIELD: electric engineering.

SUBSTANCE: in accordance to method for changing amount of energy in magnetic system, current is measured in at least one pair of windings of magnetic coil, while changed in one coil is electric current of one direction of current density vector, and in another winding electric current of opposite direction of current density vector is measured. Device contains magnetic coil containing at least one magnet with winding. Magnetic system contains at least one more winding, while at least two windings are made with possible connection as one pair of windings and are made with possibility of joint powering by currents of opposite directions, while it is possible to inject energy into at least one pair of windings and to eject energy from at least one pair of windings.

EFFECT: increased efficiency of parameter changes in magnetic system.

2 cl, 14 dwg

FIELD: electricity.

SUBSTANCE: thermo stabilised superconductors are implemented in the shape of matrix from metal or alloy, containing fibers of superconducting material and combination of rare-earth metals with extremely high heat capacity at low temperatures. At that superconductor contains at least two metallic tubes of unconditioned cross-section filled by combination of rare-earth metals and distance between tubes is not less then two tube linear dimensions. Superconductor has external envelope made from metal with high conducting properties. Tubes with combination of rare-earth metals can be distributed either by section of conductor as in matrix or by envelope.

EFFECT: extension of superconductor capabilities by means of increasing of its heat-absorbing abilities.

4 dwg

FIELD: physics.

SUBSTANCE: proposed saddle shaped coil winding (3) is made from a flat shape of a race track type coil on a pipe-like lateral surface (Mf) such that, it contains winding sections (3a) axially passing on the lateral side and winding sections (3b, 3c), passing between them on frontal sides, which form end windings. Separate turns (Wi) of the coil winding must be made from at least one tape of a superconductor (5), particularly with superconducting material with high critical temperature Tc, whose narrow side (5a) faces the pipe-like lateral surface (Mf). To prevent inadmissible mechanical loads on the conductor when forming the winding, turns (Wi) in the saddle shape must have perimetre (U) respectively, which remains virtually unchanged compared to that in a flat coil.

EFFECT: efficient use of superconducting material from ready tape-like conductors with compact arrangement of windings; small diametre can be achieved of the area forming the pipe-like lateral surface.

23 cl, 10 dwg

FIELD: electricity.

SUBSTANCE: invention relates to electrical engineering, specifically to thermo-stabilised superconductors based on the Nb3Sn compound and methods of making the said superconductors. The thermo-stabilied superconductor based on the Nb3Sn compound is made in form of a matrix from a metal or alloy, containing superconducting material fibre, metal tubes filled with a rare-earth metal compound with extremely high heat capacity at low temperatures, an outer hollow copper cylinder and a thin cylindrical shell made from titanium and/or niobium placed coaxially between the matrix and the outer hollow copper cylinder. The metal tubes are tightly pressed to each other in the gap between the cylinder and the shell in the first version, or in a gap made in the radial direction in the wall of the cylinder in the second version. The method of making such thermo-stabilised superconductors is described.

EFFECT: wider functional capabilities of a thermally insulated superconductor due to presence in the superconductor of a rare-earth intermetallic compound with extremely high heat capacity at helium temperatures, which increases mean heat capacity of the superconductor by 5-6 times.

12 cl, 11 dwg

FIELD: electricity.

SUBSTANCE: electrotechnical current limitation device includes primary winding, secondary winding containing suppressed superconductor which is characterised by transition from condition with low resistance to condition with high resistance when electric current exceeds critical value. Secondary winding is connected to primary winding with common part of magnetic flow. In addition, secondary winding includes metal element (6) creating closed circuit, and cryostat (5) providing cooling of secondary winding. Besides it includes at least one element (3) arranged on considerable part of non-suppressed conductor characterised with minimum dependence of its resistance on current and magnetic field, and some part of suppressed superconductor. At least one loop of non-suppressed superconductor (3) and suppressed superconductor (2) are electrically connected in series, thus forming closed circuit.

EFFECT: reducing response time and providing the possibility of controlling it.

17 cl, 8 dwg

FIELD: electricity.

SUBSTANCE: device with superconducting coil includes the following: cylindrical container for coil, which has inner circumferential surface and outer circumferential surface. Superconducting coil is stored in cooled container for the coil so that superconducting element is wound on circumferential surface. Columnar magnetic body is attached to inner circumferential surface of container for coil.

EFFECT: sizes are decreased.

4 cl, 11 dwg

Up!