Method for manufacturing spiral coil of magnetic explosion generator

FIELD: explosive pulse engineering.

SUBSTANCE: proposed method for manufacturing spiral coil for magnetic explosion generator producing current pulses of mega-ampere level intended to obtain more densely wound coil of higher inductance and, hence, higher current gain of magnetic explosion generator includes winding of insulated conductors on mandrel, coil potting in compound, curing of the latter, and coil removal from mandrel. Round-section conductor is deformed prior to winding until its sectional area is enclosed by oval, then it is covered with insulation and wound so that small axis of oval is disposed in parallel with spiral coil axis.

EFFECT: improved performance characteristics of coil.

1 cl 2 dwg

 

The invention relates to an explosive pulse technique and is intended for use in the technology of helical explosive magnetic generators (VMG) for receiving current pulses megaampere level.

A known method of manufacturing a spiral coil VMG. For example, in a Multiple generator MK-2" Aiyasi, Rssdi, Ashurites, Gemserv, Neprilysin. Ultrastrong magnetic fields. Physics. Technique. Application. M., Nauka, 1984, s.312-320 is described a method of manufacturing a spiral coil VMG, which consists in winding of insulated conductors of circular cross section, the mandrel parallel to each other.

A disadvantage of the known method of manufacturing a spiral coil VMG is a limit in the step of winding a helical coil associated with the cross-section of conductors. The step of winding conductors cannot be less than the diameter of the conductor, and the conductor size may not be less than the depth of the skin layer of penetration of the magnetic field inside the conductor due to diffusive loss of magnetic flux.

There is also known a method of manufacturing a spiral coil, as described in "Explosive generators of powerful electric shocks to the" Aaacercasi and other proceedings under the editorship of Vladimir Fortov. M., Nauka, 2002 this paper describes a method of manufacturing a spiral coil VMG, which consists in winding the insulation is avannah conductors on the mandrel, the shading coils compound, hardening it and removing the coil from the mandrel.

The disadvantages of this method of manufacturing a spiral coil VMG are limitations associated with the shape of the winding conductors. When reducing the diameter of the wires to increase the inductance of the coil by increasing the number of turns per unit length, increased loss of magnetic flux due to diffusion of the magnetic flux through the winding conductors outside of the outline of VMG.

This invention solved the problem of developing a method of manufacturing a spiral coil VMG, which provide improved performance properties.

When solving this task, the technical result is to obtain in this way a spiral coil with tighter winding and, consequently, increase its inductance and consequently increasing gain current VMG.

This technical result is achieved by the fact that in comparison with the known method of manufacturing a spiral coil, which consists in winding of insulated conductors on the mandrel, the shading coils compound, hardening it and removing the coil from the mandrel before winding the conductor of circular cross-section to deform the cross-section bounded by an oval, covered with insulation, and the winding conductors carried out so that the minor axis of the oval RA is put parallel to the axis of the spiral coil.

To reduce the loss of magnetic flux in the prototype was used spiral coil conical shape. In this case, the circuit of the coils of the spiral walls of the Central tube VMG is at a greater angle than the cylindrical shape of the spiral coil, and the loss on the cut off part of the magnetic flux on the heterogeneity of spiral turns are reduced.

But this method does not allow to increase the number of spiral turns per unit length. The disadvantage of the method of manufacturing a spiral coil VMG prototype is the use of winding conductors of circular cross section. While maintaining the magnetic flux gain current (T) VMG is equal to:

where I0- initial current power supply VMG, L0- the initial inductance of the spiral coil, LK- end inductance, ITo- final current VMG. This shows thatTdepends on the ratio of initial and final inductance of the spiral coil VMG. To increase the efficiency of VMG required per unit length of the spiral coil to wind as many turns of conductors, i.e. to ensure the maximum possible value of the spiral inductance per unit length. Reducing the diameter of the conductors, we can increase the number of spiral turns per unit length, but we can't do di the meter conductors is less than the depth of penetration of the magnetic field in the wire due to the loss of magnetic flux due to the leakage magnetic field through the conductors.

Near point of dynamic contact of the walls of the Central tube with the turns of the spiral during operation VMG magnetic lines of force directed perpendicular to the axis of the spiral coil. To reduce losses of magnetic flux of the winding conductors carried out so that the minor axis of the oval cross section of the conductors is parallel with the axis of the spiral coil (in this case, the leakage magnetic flux through the conductors minimal).

In the proposed method of manufacturing a spiral coil explosive magnetic generator prior to winding on the mandrel conductor of circular cross section to deform the cross-section bounded by an oval, covered with insulation, and the winding of the conductor is carried out so that the minor axis of the oval feature parallel to the axis of the spiral coil. This allows you to increase the number of turns per unit length and the inductance of the coil increases in proportion to the square of the number of turns.

The length of the major axis of the oval (l) cross-section of the conductor must be more depth (δ) penetration of the magnetic field inside the conductor l≥δ.

The depth of penetration of the magnetic field inside the conductor (the thickness of the skin layer) is determined by the ratiowhere χ0is the diffusion coefficient of a magnetic field to the conductor material, τ - the nature of the th rise time of the current in the spiral coil. When deformation of the conductor must be the following value:where d is the diameter of the conductor.

The inductance of the spiral coil is determined by the ratio

,

where KL- correction factor inductance that depends on the ratio of the length to the diameter of the spiral coil, N is the number of turns of the coil, coil length, S is the cross-sectional area of the coil, μ - magnetic permeability. This shows that the inductance of the spiral coil quadratically dependent on the number of turns. For example, if due to the deformation of the winding of the conductor we will double the number of turns per unit length of the coil compared to a coil wound around a conductor with a circular cross section, thereby fourfold increase the initial inductance of the spiral coil and in the same time to increase the gain current (assuming losses of magnetic flux at the same level).

1 shows a device for implementing the method of manufacturing a spiral coil explosive magnetic generator.

Figure 2 shows explosive magnetic generator with a spiral coil made of the proposed method.

The device of figure 1 and 2 contain:

1 - winding spiral conductor coil VMG;

2 insulated conductor;

3 - a mandrel for winding a helical coil;

4 - compound;

5 - insert;

6, 7 - flanges spiral coil and VMG;

8 - load VMG;

9 - charge of the Central pipe VMG;

10 - the Central pipe VMG;

11 - the detonator;

12 - the source of primary power supply VMG.

Refer to figure 1:

h - step winding spiral;

a - minor axis of the oval cross-section of winding wires;

l - major axis of the oval in cross section winding wire.

A method of manufacturing a spiral coil VMG is winding at least one insulated conductor (POS.1, 2) on the mandrel (3), the shading coil with a compound (4), hardening it and removing the coil from the mandrel (3). Before winding the coil conductor of circular cross section of diameter d to deform the cross-section bounded by an oval with the minor axis and the major axis (l), cover winding conductor (1) insulation (2). The winding of the conductor is carried out so that the minor axis of the oval (a) have a parallel to the axis of the coil. The mandrel (3) are made of polyethylene in the form of a thin-walled cylinder, which from the outside perform special grooves, along which the place of winding wire. Inserting (5) are made of metal, which serves to stiffen the mandrel (3).

Figure 2 schematically VMG using spiral coil made by TRAI is the PTO method. In the example implementation of the proposed method before winding cylindrical conductor with a diameter of 0.5 mm was passed through rolls and deformed so that its cross section has an oval shape with a minor axis of 0.25 mm and the major axis of 0.75 mm After deformation of the conductor was covered with insulation made of Mylar and Teflon films with a total thickness of 0.2...0.3 mm, and placed in the grooves of the mandrel (3). The ends of the conductors were connected to the flanges (6, 7). After winding the conductors were coated with compound. After hardening compound coil was removed from the mandrel and placed in the design VMG shown in figure 2. If the spiral coil was wound conductor having a cross section of circle with a diameter of 0.5 mm, length 10 cm number of turns does not exceed 12,5 (step winding - 0.8 mm). Spiral coil wound deformed conductor, in cross section having the form of an oval with the minor axis of 0.25 mm and the major axis of 0.75 mm, has a number of turns 18 (step winding - 0.55 mm). The initial inductance of the spiral coil, is wound by the present method, has doubled, i.e. without loss of magnetic flux magnification power can be increased in two times when the effective rise time of the current in the spiral coil 15 ISS. The conductor is made of copper, the thickness of the skin layer of penetration of the magnetic field is 0.45 mm

If the would have wound coil conductor, having in cross section a circle with a diameter of 0.25 mm, the thickness of the wire would be certainly less than the thickness of the skin layer, and would be large losses of magnetic flux due to diffusion through the conductor (>50%).

The opening angle of the walls of the Central pipe (α) VMG, the step of winding of the helix h and the magnitude of heterogeneity spiral winding Δx are related by the following ratio:Under heterogeneity of winding turns of the spiral coil here refers to fluctuations in the location of the conductor on the mandrel in a vertical plane relative to the average position.

Estimates show that in the spiral coil with a diameter of 80 mm and a length of 100 mm, manufactured by the present method (winding round conductor diameter 0.5 mm is deformed into a conductor having a cross-section of oval shape with the minor axis of 0.25 mm and the major axis of 0.75 mm, covered with insulation placed over the mandrel so that the minor axis of the oval is parallel to the axis of the coil), the primary inductance can be increased from 14 Áh to 28 Áh. Due to this, increases the zoom factor of the current, and taking into account losses of magnetic flux final current VMG increases by more than 50% and reaches values of more than 1 MA.

A method of manufacturing a spiral coil explosive magnetic generator, which consists in winding insulated conductor on the mandrel, over which ivce coils compound, solidification and removal of the coil from the mandrel, characterized in that before the winding conductor of circular cross section to deform the cross-section bounded by an oval, covered with insulation, and the winding of the conductor is carried out so that the minor axis of the oval feature parallel to the axis of the spiral coil.



 

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