Superconducting coil

 

(57) Abstract:

The invention relates to the field of cryogenic electrical engineering, in particular to the design of the superconducting winding of the electromagnetic device. The inventive superconducting coil includes primary and secondary multi-layer winding of the superconducting wire, the turns of which are spaced from each other at a distance of t=dowhere dabout- the diameter of the superconductor, with the first three layers of the winding are located from each other at distances equal respectively to two or three diameters of the superconducting conductor, and subsequent layers are located at a distance equal to the distance between the coils. 1 Il., table 1.

The invention relates to the field of cryogenic electrical engineering, can be used in superconducting transformers, cryotron etc.

Known superconducting multilayer winding of the power transformer containing cylindrical, concentrically arranged primary and secondary windings with a scattering channel between them and the ferromagnetic core rod type, located in the warm zone, at room temperature (Wilkinson K. J. R. "Superconductive Windings in power transformers". Proc. Jngt. Electrical Eng. 1963, v.110, N12, p. 2271 2279). Winding defects, because the scattering channel between the windings of the induction magnetic field scattering is generated total IMPELLITTERI primary and secondary windings and get high. Is also a strong edge effect, resulting in a strong distortion of the leakage field and the excessive increase in the current density at the edges of the cylindrical windings. All this leads to increased losses in the windings, reducing the current-carrying capacity and decrease the efficiency of the transformer.

Also known construction of the superconducting winding of the power transformer. C. the USSR N1228708, BI N16, 1986), containing the primary and secondary coil windings are placed around the perimeter along the surface of the two coaxially arranged tubular insulating bobbins and wound spirally at a constant angle of inclination for forming the annular surface of each tubular insulating frame with one full rotation around its axis and spaced from each other along the perimeter surface of the frame by a distance t, which is determined from the relation t=dowhere d0the diameter of the superconducting conductor. This construction of the winding is single layer. Application in superconducting winding of the principle of the arrangement of coils of notary in it and thereby significantly increase the current carrying capacity and efficiency of the power transformer.

However, this superconducting transformer has a limited capacity due to the fact that winding it made a single layer. The use of multilayer windings on the above principle would lead to increase in mass and size parameters of the transformer and cristaliana. Increase the cost of the refrigerant liquid nitrogen and liquid helium and energy associated with the process of liquefaction. These circumstances lead to the reduction of the overall efficiency of the system transformer system for cryogenic support.

The proposed technical solution implementation superconducting multilayer winding reduces the distance between the layers of coils of superconducting windings, which leads to an increase in overall efficiency, reduces weight and dimensions of the windings of the cryostat, liquid helium and nitrogen and the energy is converted and functioning. At the same time this design can also increase the individual capacity of the superconducting winding due to the increased number of turns and the associated voltage.

These technical results are achieved due to the fact that the superconducting winding of the electromagnetic device containing a primary and secondary winding and the diameter of the superconducting conductor, executed multi-layered, with the first three layers spaced from each other at distances equal respectively to two or three diameters of the superconducting conductor, and subsequent layers are located at a distance equal to the distance between the coils.

The drawing shows a schematic cross section of a superconducting coil that implements the above-mentioned advantages.

Superconducting coil 1, comprising primary and secondary windings of the superconducting conductor 2, contains three layers.

By placing a superconducting current-carrying elements at a certain distance from each other equal to doas in known winding structure, minimizes the influence of magnetic fields of the conductors to each other and thereby significantly reduce the losses in the superconductor. But when running winding multilayer using this ratio between the two layers increases its size. The placement of the first three winding layers at distances equal respectively to two or three diameters of the superconductor, eliminates these disadvantages due to the fact that each turn of winding layers is a field of its own power, provided that:

< / BR>
Hthe size of the magnetic field of one coil, created by the current of this round.

The magnetic field of the winding is equal to:

,

where I is the current flowing through the coil;

Wtotalthe total number of coils in a superconducting winding;

b the length of the superconducting winding.

The magnetic field of one coil is equal to:

< / BR>
The total number of coils in a superconducting winding is:

< / BR>
where W1the number of turns in each layer;

the number of layers in the winding.

The number of turns in each layer is:

< / BR>
t the distance between the centers of the cross-section of the coil conductor in each layer and is equal to t=do.

Substituting the value of t, we get:

The number of layers in the winding is determined from the relation:

< / BR>
a width of the winding section;

tathe distance between the layers, the layer step ta=Kad0,

where Kacoefficient taking into account the distance between the layers.

Substituting the value of W1in equation (3), we get:

< / BR>
where

< / BR>
Substituting the values from equations (5) and (2) in our condition (1), we get:

,

where

The ratio of the number of layers of the superconducting winding (Waprovided that the layers are adjacent, i.e., between them there is no distance (except for the e value of Kadefined desired distance taKad0.

The result is the distance values of tabetween the different layers, which are entered in the table.

From the tables we see that when the number of layers of superconducting winding not exceeding the number "3" has the effect of placing layers at a distance equal respectively to two or three diameters of the superconducting conductor turns of the windings. Beginning with the fourth layer, this advantage is lost because the value of Kabecomes greater and therefore, it is advisable with this layer apply layout layers on the principle of "p."

The use of the above arrangement of layers in a multilayer superconducting coil will expand the possibility of using superconducting electromagnetic devices and systems.

The superconducting winding of the electromagnetic device containing the primary and secondary windings of superconducting wire coils which are located apart from each other at a distance of t = dowhere d0the diameter of the superconducting conductor, characterized in that the windings are made of layered, with the first three layers spaced from each other on restiani at a distance, equal to the distance between the coils.

 

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