RU2308108C2 - Inductance coil - Google Patents

Abstract

FIELD: radio engineering; power amplifier harmonic filters and antenna-matching short-wave radio transmitters.

SUBSTANCE: proposed inductance coil has single-range chord winding disposed on sectional former built of two parallel side panels joined together by means of rectangular-section connecting strips with slots to receive wire. Coil is wound with round-section uninsulated wire and has N parallel-connected windings; first-winding wire is placed in respective slots of connecting strips to form other-than-round turns; wire of each next winding is placed on top of that of preceding winding in same slots of connecting strips and in same sequence as first-winding wire; each turn of each winding has M edges, where M > 4 is number of connecting strips. Newly introduced is additional panel disposed in parallel with side panels and used to join all connecting strips together in center of their length. This inductance coil has two design alternates of its fastening: (a) by means of two diametrically opposite elongated connecting strips disposed in one plane and provided with holes at ends; (b) by means of side panels provided with fastening holes.

EFFECT: reduced size of coil at sufficient surface area for winding wire.

3 cl, 3 dwg

Description

The invention relates to the field of radio engineering and can be used in harmonic filters of power amplifiers and in antenna matching devices of short-wave transmitters.

In the tuning nodes of high-power short-wave transmitters, single-row winding with a thick copper wire or tape wound around the edge is used [1, p. 70]. Given the “surface effect” at high frequencies [1, p. 33, 35] also use coils of copper tubes [1, p. 70].

These inductors have large overall dimensions. An attempt to reduce the dimensions of the inductor for radio transmitters was made in [2]. The inductor is made in the form of N spiral coils with non-circular coils, wound with an uninsulated wire and placed on a prefabricated frame consisting of two panels connected by combs, in each of the grooves of which coils of one of the spiral coils are fixed, as well as dielectric rods designed to fix step between turns of spiral coils. In addition to the increased complexity of the design and manufacturing process, this inductor has another significant drawback - the possibility of breakdown through the air between the turns of adjacent spirals due to the large voltage difference at these points, since not adjacent turns are located in the immediate vicinity, but they differ significantly in potential winding sections.

In the coils of short-wave transmitters of sufficiently high power (of the order of 1 kW and above) "single-layer cylindrical windings of copper wire, tape or tube" are most used [3, p. 117]. To reduce the overall dimensions of the inductors use a tape wound on a rib [3, p.118]. Moreover, in terms of surface area, the tape with the cross section a × b is equivalent to a wire or tube with a diameter of D = 2 (a + b) / π. For example, a tape 1 mm thick and 8 mm wide replaces a wire or tube with a diameter of about 6 mm. However, when using a tape wound around a rib, only the length of the winding, but not its diameter, can be reduced. It is very difficult technologically, for example, to wind a ribbon 1 mm thick and 8 ... 10 mm wide on the rib and get a coil with a diameter of 40 ... 50 mm.

The design of the inductor with winding in the form of a tape on the rib, described in [3, p.140, Fig.6-18], is selected as a prototype as the closest in technical essence to the claimed one.

The design of the prototype is a prefabricated frame with winding in the form of a tape on the rib. The frame consists of two side panels interconnected by four combs, made in the form of strips of rectangular cross section with grooves for the wire.

This inductor has a large overall dimension due to the increased diameter of the winding tape on the rib. In addition, it can be seen from [3, Fig. 6-18] that the combs are located on top of the winding, which further increases the size of the inductor.

The objective of the invention is to reduce the overall dimensions of the inductor while providing the necessary surface area of the winding wire.

This problem is solved by the fact that in an inductor containing an ordinary cylindrical winding in increments located on a prefabricated frame consisting of two side panels arranged in parallel and connected by combs made in the form of strips of rectangular cross section with grooves for the wire, the winding is made of uninsulated round wire sections in the form of N windings connected in parallel, while the wire of the first winding is laid in the corresponding grooves of the combs with the formation of turns of a non-circular shape, and the wire of each subsequent The total winding is laid in the same grooves of the combs in the same sequence as the wire of the first winding, with each turn of each winding having M faces, where M≥4 is the number of combs, in addition, an additional panel is introduced parallel to the side panels and connecting all combs among themselves in the middle part of their length.

The proposed inductor has two mounting options. In the first embodiment, the inductor is mounted mainly in a horizontal position for two diametrically opposite and located in the same plane combs of increased length, protruding beyond the side panels and provided with holes for mounting. In the second embodiment, the inductor is mounted mainly in the vertical position for the end part, that is, for the side panel provided with holes that may be threaded. In this case, it is also possible to mount the inductor for both side panels at the same time.

A comparative analysis of the proposed inductance coil and prototype shows that the inventive device is characterized by smaller overall dimensions while providing the necessary surface area of the winding wire. With a thin, non-insulated wire (for example, 1 mm in diameter), it is possible to wind a coil of much smaller diameter than tape onto a rib, and by repeating N times winding with the same wire, it is possible to provide the necessary total surface area of the winding, that is, to ensure the permissible density of high-frequency electric current.

The claimed inductor, in comparison with the prototype, has a smaller diameter, therefore, allows a closer arrangement of screens, which provides a significant reduction in overall dimensions and mass of the device in which these inductors are used.

There is another gain in size (and weight). The above example of equivalence of a tape with a cross section of 1 × 8 mm and a wire or tube with a diameter of 6 mm can be continued in the case of the proposed inductance coil. It is easy to determine that a total of only six wires with a diameter of 1 mm will provide this surface area of the winding wire.

In addition, the manufacturing process of the proposed inductor is much simpler than that of the prototype, and does not require complicated special equipment. Like the prototype, the claimed device provides the possibility of effective forced cooling of the structure (its sufficient "purge"), which is very important in the case of using an inductor in the output circuits of high-power short-wave transmitters.

Figure 1 shows the proposed inductor for the first mounting option with the number of turns multiple of an integer. In this case, the beginning and end of the winding are located and fixed on one comb. Obviously, the number of turns can be a multiple of 0.5 or even 1 / M, where M is the number of winding faces equal to the number of combs. Figure 2 presents the inventive inductor for the second mounting option. Figure 3 shows the prefabricated frame of the claimed inductor.

The inductor contains an ordinary cylindrical winding 1 in increments, located on a prefabricated frame consisting of two side panels 2 connected by combs 3 made in the form of strips of rectangular cross section with grooves 4 for the wire. The winding 1 is made of non-insulated wire of circular cross section in the form of N windings 5 connected in parallel (here N = 6). The wire of each subsequent winding is laid over the wire of the previous winding in the same grooves 4 of the combs 3 in the same sequence with the formation of non-circular turns, with each full turn of each winding having M faces. In the designs shown in FIGS. 1 and 2, M = 6. All windings 5 at the beginning and at the end are connected in parallel using clamps 6, covering the wires of all windings, and then comb, in order to secure the wires of the windings. The wires and clamp are fastened together by soldering.

In figure 1, two diametrically opposite and located in the same plane of the comb 7 have an increased length and holes 8 for mounting. Figure 2 presents the second mounting option of the claimed inductor, in which the side panels 2 are provided with holes 9 for mounting, which can be threaded. The number of holes is from two to four. In FIG. 3 shows a prefabricated frame of the claimed inductor. To eliminate the bending of the dies during winding of a large number of turns, an additional panel 10 has been introduced, located parallel to the side panels 2 and connecting all the dies 3 to each other in the middle part of their length. The additional panel 10 is in the form of a disk with M radial shallow grooves around the perimeter of the disk to accommodate combs. With a small number of turns, that is, with a small length of the combs, an additional panel 10 may be absent.

Information sources

1. Reference book on radio engineering. Under the total. ed. Ing. B.A.Smirenin. M. - L .: Gosenergoizdat, 1950

2. Patent RU 2120148, cl. H01F 17/02, H01F 41/08, H01F 41/06. Inductor, method of its manufacture and adaptation for its implementation / E.S. Bobkov, V.A. Sorokin. - Stated March 11, 1997; published on 10/10/98.

3. Finkelstein L.A., Hirschman G.Kh. Antenna circuits of wide-range short-wave transmitters. M. - L .: Gosenergoizdat, 1960.

Claims (3)

1. The inductor containing an ordinary cylindrical winding in increments, located on a prefabricated frame, consisting of two side panels arranged in parallel and connected by combs made in the form of strips of rectangular cross section with grooves for the wire, characterized in that the winding is made of an insulated circular drive in the form of N windings connected in parallel, while the wire of the first winding is laid in the corresponding grooves of the combs with the formation of turns of non-circular shape, and the wire of each subsequent winding is laid on top of the wire of the previous winding in the same grooves of the combs in the same sequence as the wire of the first winding, with each turn of each winding having M faces, where M> 4 is the number of combs, in addition, an additional panel is introduced parallel to the side panels and connecting all combs to each other in the middle part of their length. 2. The inductor according to claim 1, characterized in that the two diametrically opposite and located in the same plane of the combs have an increased length, protrude beyond the side panels and are provided with holes for fastening. 3. The inductor according to claim 1, characterized in that the side panels have holes for mounting.

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