JP7452347B2 - cable - Google Patents

Description

TECHNICAL FIELD The present invention relates to cables.

BACKGROUND ART It is known that cables used for transmitting high-frequency power are made by bundling a plurality of insulated conductor wires in order to reduce high-frequency resistance (AC resistance) of the insulated conductor wires. Patent Document 1 (Japanese Unexamined Patent Publication No. 2011-124129) and Patent Document 2 (Japanese Unexamined Patent Publication No. 5-263377) disclose a structure in which the outer periphery of a conductor is covered with an insulating coating such as enamel as a structure for reducing high frequency resistance. A so-called Litz wire is described in which a plurality of insulated conductor wires are bundled and twisted, and the wires are insulated and covered with an outer sheath.

Japanese Patent Application Publication No. 2011-124129 Japanese Patent Application Publication No. 5-263377

For Litz wires, it is desirable to reduce the amount of conductor used in the cable from the viewpoint of reducing the cost and weight of the cable. However, simply reducing the amount of conductor in a cable increases the DC resistance, which is the base of the high-frequency resistance, so it is difficult to sufficiently reduce the high-frequency resistance even if the litz wire suppresses the high-frequency resistance. .

An object of the present invention is to provide a cable that can reduce the electrical resistance at high frequencies and the amount of conductors used.

Other objects and novel features will become apparent from the description herein and the accompanying drawings.

A brief overview of typical embodiments disclosed in this application will be as follows.

The cable according to one embodiment is a cable that is an n-th order aggregate line (n: natural number, n>1), and the n-th order aggregate line is a plurality of n-1 order aggregate lines bundled into one. Each of the plurality of n-1 order aggregated wires includes a plurality of strands bundled into one. Here, among the plurality of strands constituting the n-1st-order strands in the outermost layer of the n-th-order strands, the outermost strands of the n-1st-order strands are coated with a conductor and an insulating coating. the plurality of insulated conductor strands that are located inside the outermost layer of the strands of the n-1st order assembled wire among the plurality of strands constituting the n-1st order assembled wire; A portion of the wire is a dielectric wire.

According to one embodiment disclosed in this application, it is possible to realize a cable that can reduce electrical resistance at high frequencies and that can reduce the amount of conductors used.

FIG. 1 is a cross-sectional view of a cable according to an embodiment. FIG. 7 is a cross-sectional view of a cable that is a first modification of the embodiment. FIG. 7 is a cross-sectional view of a cable that is a second modification of the embodiment. FIG. 7 is a cross-sectional view of a cable that is a third modification of the embodiment. FIG. 7 is a cross-sectional view of a cable that is a fourth modification of the embodiment. It is a sectional view of the cable which is modification 5 of an embodiment. 3 is a cross-sectional view of a cable that is Comparative Example 1. FIG. 3 is a cross-sectional view of a cable that is Comparative Example 2. FIG.

Hereinafter, embodiments will be described in detail based on the drawings. In addition, in all the drawings for explaining the embodiment, members having the same function are given the same reference numerals, and repeated explanation thereof will be omitted. Furthermore, in the following embodiments, descriptions of the same or similar parts will not be repeated in principle unless particularly necessary.

(Embodiment)
<Details of room for improvement>
Cables used for transmitting high-frequency power have a problem in that the higher the frequency of the transmitted power, the more the electrical resistance (high-frequency resistance) of the insulated conductor wire increases due to the skin effect. That is, as the frequency of the alternating current becomes higher, the interaction between the generated alternating magnetic flux and the current makes it easier for the current to flow on the surface side of the wire, and the current density is concentrated on the surface side of the wire. As a result, the high-frequency alternating current flows intensively to a portion of the total cross-sectional area of the electric wire, that is, to the thin wall portion on the front side, and the alternating current resistance value increases due to the decrease in the current-carrying area.

In order to solve this problem, it is possible to use a cable called a Litz wire. FIG. 7 shows a cable 36 made of a Litz wire as Comparative Example 1. The cable 36 includes an insulated conductor wire 1a consisting of a wire with an insulating coating (insulated conductor wire), which is subdivided into wire diameters of about 200μ or less, that is, a conductor whose outer peripheral surface (surface) is covered with an insulating film. For example, it has a structure in which more than 1,000 pieces are bundled together. For example, here, as shown on the left side of FIG. 7, the primary wire assembly 13 is made up of 37 insulated conductor strands 1a bundled together, and as shown in the center of FIG. constitute one secondary set line 24. Furthermore, by bundling seven bundled wires 24, a cable 36, which is one tertiary bundled wire, is configured.

In this application, the assembled line produced in the first assembly process is called a "primary assembly line", and the assembly line produced in the n-th assembly process is called an "n-order assembly line". Here, n is a natural number greater than 0. The n+1st-order set line is produced by bundling the n-th order set lines in the (n+1)th set process.

By bundling a plurality of thin insulated conductor wires 1a in this manner, the surface area of the insulated conductor wires in the entire cable 36 is increased. In the cable 36, it is possible to disperse, divide, and reduce current density concentration due to the skin effect by increasing the number of front and outer peripheral surfaces of the insulated conductor wires and increasing the surface area accordingly.

However, litz wires are expensive due to their complex structure and the large amount of conductor used. Furthermore, the Litz wire has a problem in that it is heavy due to the large amount of conductor used. Therefore, from the perspective of reducing cable cost and weight, it is desirable to reduce the amount of conductor used in cables.

However, simply reducing the amount of conductor in a cable increases the DC resistance, which is the base of the high-frequency resistance, so it is difficult to sufficiently reduce the high-frequency resistance even if the litz wire suppresses the high-frequency resistance. .

Here, as Comparative Example 2, a cable 25 having a structure in which the amount of conductor is reduced compared to the above-mentioned Litz wire is shown in FIG. Six primary bundled wires 13 are twisted around a primary bundled wire 14 formed by bundling, for example, 37 dielectric wires 1f made of a dielectric material, of the cable 25, which is a secondary bundled wire. It is composed by combining.

In this way, by replacing the insulated conductor wire at the center of the cable 25 with a dielectric wire, it is possible to reduce the amount of insulated conductor wire used. However, each of the six primary assembled wires 13 surrounding the primary assembled wire 14 made of dielectric material is entirely composed of the insulated conductor strands 1a. For this reason, in many cases, almost no current flows through the insulated conductor strands 1a at the center of the primary wire assembly 13 due to the skin effect, resulting in wasted conductor usage.

As described above, in cables, there is room for improvement in reducing the amount of conductors used in cables from the viewpoint of reducing manufacturing costs and weight.

<Cable structure>
The cable of this embodiment will be described below with reference to FIG. The cable of this embodiment is used, for example, as a high frequency power transmission cable. FIG. 1 is a sectional view of the cable of this embodiment. In Figure 1, the cubic set line is shown on the right side of the figure, the quadratic set line, which is a component of the cubic set line, is shown in the center of the figure, and the first order set line, which is a component of the quadratic set line, is shown in the diagram. is shown on the left. Further, in FIG. 1, the cross section of the dielectric wire is not hatched to make the diagram easier to read.

As shown in FIG. 1, the cable 30 of this embodiment is a bundled wire made by bundling a plurality of strands. The plurality of wires are an insulated conductor wire (insulated conductor wire) 1a made of a conductor whose outer peripheral surface (surface) is covered with an insulating film, and a dielectric wire (dielectric wire) 1b made of a dielectric material. , 1c and 1d. The insulated conductor strand 1a is composed of an extending conductor and an insulating coating covering the outer periphery of the conductor.

The conductor constituting the insulated conductor strand 1a is, for example, copper (Cu) or aluminum (Al). Further, the material of the insulating film is, for example, enamel. That is, the insulated conductor strand 1a is, for example, an enameled wire. Furthermore, polyurethane or fluororesin (for example, polytetrafluoroethylene (PTFE)) can be used as the material for the insulating coating. The material of the dielectric wires 1b, 1c, and 1d is, for example, rayon fiber (splash wire), polyester fiber, para-amide fiber, polypropylene wire, or fluororesin wire (Teflon (registered trademark) wire). The specific gravity of the material constituting the dielectric strands 1b, 1c, and 1d is smaller than the specific gravity of the material constituting the insulated conductor strand 1a. The above-mentioned materials for the conductor, insulating coating, and dielectric strand can be applied to the respective materials for the conductor, insulating coating, and dielectric strand, which will be explained later in the modified examples.

Here, the primary assembled wire 10 is composed of an assembled wire made up of a plurality of dielectric strands 1b, and a plurality of insulated conductor strands 1a arranged so as to cover the surface of the assembled wire. Here, for example, 18 insulated conductor strands 1a are arranged so as to surround the outer periphery of a collective wire made up of 19 dielectric strands 1b. In other words, the outermost layer of the primary assembled wire 10 is composed of the insulated conductor strands 1a, and among the strands of the primary assembled wire 10, the dielectric strands 1b are arranged inside the outermost layer. It is used. Therefore, on the surface of the primary wire assembly 10, only the insulated conductor wires 1a are exposed, and the dielectric wires 1b are not exposed.

The primary assembled wire 10 may be a twisted wire. In this case, due to the twisting, the arrangement (arrangement) of the insulated conductor strands 1a changes in the longitudinal direction of the cable 30. Further, the primary aggregated wire 10 may be simply a bundle of linearly extending strands. Further, the plurality of insulated conductor strands 1a in the outermost layer may form a braid surrounding the outer periphery of a set of 19 dielectric strands 1c.

Further, the secondary assembled line 20 is composed of a primary assembled line 11 made of a plurality of dielectric strands 1c, and a plurality of primary assembled lines 10 arranged so as to cover the surface of the primary assembled line 11. ing. The primary assembled wire 11 has, for example, a structure in which 37 dielectric element wires 1c are bundled into one wire. The primary assembled wire 11 may be a twisted wire, or may be a simple bundle of linearly extending strands. In this way, the primary assembled line 11 on the inner side of the outermost primary assembled line 10 of the secondary assembled line 20 is constituted by a plurality of dielectric strands 1c bundled into one.

Further, here, for example, six primary aggregate lines 10 are arranged so as to surround the outer periphery of one primary aggregate line 11. In other words, among the primary set lines forming the secondary set line 20, the outermost layer is composed of the first set line 10, and the first set line 11 is used inside the outermost layer. Therefore, on the surface of the secondary assembled wire 20, what is exposed is the insulated conductor strand 1a, and the primary assembled wire 11 is not exposed.

The secondary assembled line 20 may be a twisted wire obtained by twisting the primary assembled lines 10 around the primary assembled line 11. In this case, due to the twisting, the arrangement (arrangement) of the primary assembled wires 10 changes in the longitudinal direction of the cable 30. Further, the secondary set line 20 may be simply a bundle of linearly extending linear set lines. Further, the outermost layer primary clump line 10 may constitute a braid surrounding the outer periphery of the primary clump line 11.

Further, the cable (tertiary assembled wire) 30 includes a secondary assembled wire 21 made of a plurality of dielectric wires 1d, and a plurality of secondary assembled wires 20 arranged so as to cover the surface of the secondary assembled wire 21. It is made up of. The secondary wire assembly 21 has, for example, a structure in which 259 dielectric wires 1d are bundled into one wire. The secondary wire assembly 21 may be a twisted wire, or may be a simple bundle of linearly extending wires (multi-wire cable). In this way, the secondary bundled wire 21 on the inside of the outermost secondary bundled wire 20 of the cable 30, which is a tertiary bundled wire, is composed of a plurality of dielectric wires 1d bundled into one. .

Further, here, for example, six secondary aggregate lines 20 are arranged so as to surround the outer periphery of one secondary aggregate line 21 (center bundle line). That is, among the secondary assembled wires constituting the cable 30, the outermost layer is composed of the secondary assembled wires 20, and the secondary assembled wires 21 are used inside the outermost layer. Therefore, on the surface of the cable 30, only the insulated conductor strands 1a are exposed, and the secondary assembled wires 21 are not exposed.

The cable 30 may be a stranded wire in which the secondary assembled wires 20 are twisted around the secondary assembled wire 21. In this case, due to the twisting, the arrangement (arrangement) of the secondary strands 20 changes in the longitudinal direction of the cable 30. Further, the cable 30 may be simply a bundle of linearly extending secondary collection lines. Further, the outermost layer of secondary clumps 20 may constitute a braid surrounding the outer periphery of the secondary clumps 21.

As described above, the cable 30 is a tertiary assembled line, and is configured by arranging a plurality of secondary assembled lines 20 so as to surround the secondary assembled line 21. Further, the secondary set line 20 is configured by arranging a plurality of primary set lines 10 so as to surround the primary set line 11. Further, the primary wire assembly 10 is configured by arranging a plurality of insulated conductor wires 1a so as to surround a plurality of dielectric wires 1b bundled into one. In other words, the cable 30 is made by assembling the insulated conductor wire 1a and the dielectric wires 1b, 1c, and 1d through three assembly steps. Although not shown here, the cable 30 may include an insulating layer covering the outer periphery.

Among the wires that are the basic components of the cable 30, the diameter of the insulated conductor wire 1a is smaller than the skin thickness (skin depth) at the operating frequency of the cable 30. The skin thickness is the distance at which an electromagnetic field incident on a certain material is attenuated to 1/e (≈1/2.718). The frequency at which the cable 30 is used is, for example, 10 kHz to 10 MHz. In this embodiment, the frequency at which the cable 30 is used is 85 kHz. If the frequency at which cable 30 is used is 85 kHz, the copper skin thickness is 0.227 mm. Further, the diameter of the conductor in the insulated wire 1a was 0.1 mm, the thickness of the insulating coating was 0.017 mm, and the diameter of the insulated wire 1a was 0.134 mm. The diameter of the primary clump line 10 (the diameter of the enveloping circle when drawn so as to be tangent to the outer periphery of the primary clump line 10) is 0.938 mm, and the diameter of the secondary clump line 20 (the diameter of the The diameter of the envelope circle when drawn so as to touch the outer circumference of the cable 30 is 2.814 mm, and the diameter of the cable 30 (the diameter of the envelope circle when the envelope circle is drawn so as to touch the outer circumference of the cable 30) is 2.814 mm. It was set to 8.174 mm. Further, the diameter of the insulated wire 1a is 1/90 or more of the diameter of the cable 30, that is, 0.091 mm or more. Therefore, the conductor of the insulated wire 1a has a diameter smaller than the skin thickness, and the diameter of the insulated wire 1a is 1/90 or more of the diameter of the cable 30. Further, the diameter of the dielectric wire was 0.134 mm.

The cable 30 may be used, for example, as a coil winding or a power supply cable. The power output using the cable 30 may be, for example, 11 kW or 100 kW.

Further, here, the cross-sectional shape of each of the primary set line, the secondary set line, and the tertiary set line is hexagonal. Thereby, it is possible to reduce the gap between the elements (strands or assembled lines) constituting each set of wires. That is, the diameter of the cable 30 can be reduced.

Furthermore, the bundle of dielectric strands 1b, the primary assembled wire 11 made of dielectric, and the secondary assembled wire 21 do not have a hexagonal cross-sectional shape, but are compressed toward their respective central axes. It's okay. In this manner, the diameter of the cable 30 can be reduced by compressing the bundle each of dielectric wires 1b, 1c, or 1d.

As mentioned above, the cable of this embodiment is an n-th order aggregate wire (n: natural number, n>1), and includes a plurality of n-1 order aggregate wires bundled into one, and a plurality of Each of the n-1st order set wires includes a plurality of wires bundled into one. Furthermore, among the plurality of wires constituting the n-1st order assembled wire in the outermost layer of the n-order assembled wire, the outermost layer of the n-1st order assembled wire is an insulated conductor element provided with a conductor and an insulating coating. Among the plurality of wires constituting the n-1st order assembled line, some of the plurality of wires located inside the outermost layer of the n-1st order assembled line are dielectric element wires. It is.

More specifically, in this embodiment, n>2, and in this case, among the plurality of n−1-order set lines forming the n-th order set line, the outermost layer of the n-th order set line The n-1st order set line includes a plurality of n-2nd order set lines bundled into one. Among the plurality of wires constituting the n-2nd order grouped wire in the outermost layer of the n-1st order grouped wire, the strands in the outermost layer of the n-2nd order grouped wire are the insulated conductor strands. Among the plurality of wires constituting the n-2nd order assembled line, some of the plurality of wires located inside the outermost layer of the n-2nd order assembled line are It is a dielectric wire.

<Effects of the embodiment>
If the diameter of the insulated conductor strands, which are the basic components of the cable, is larger than the skin thickness at the frequency at which the cable is used, the insulated conductor strands other than the insulated conductor strands in the outermost layer of the cable will be locally damaged due to the skin effect. It is in a state of high resistance. Therefore, even if the arrangement of the insulated conductor strands is changed in the longitudinal direction of the cable by twisting them multiple times, as in the case of the Litz wire shown in Figure 7 as Comparative Example 1, the insulation does not come out even once in the outermost layer. Almost no current flows through the conductor wire.

In other words, the Litz wire has unnecessary insulated conductor wires as a transmission cable, and the amount of conductor is wasted. Therefore, as described above, there is room for improvement in reducing the amount of conductors used in cables from the viewpoint of reducing manufacturing costs and weight. Furthermore, as shown in FIG. 8 as Comparative Example 2, even if the central bundle line in the secondary set line is replaced with the primary set line 14 made of the dielectric element wire 1f, there is no external part inside the primary set line 13. There are many strands 1a that are not exposed to the light, and there is still room for the above-mentioned improvement.

Therefore, the present inventor has discovered that the increase in high frequency resistance can be minimized by using a dielectric wire as a wire that never appears in the outermost layer.

In this embodiment, the diameter of the conductor of the insulated conductor strand 1a, which is a basic component of the cable 30, is smaller than the skin thickness at the operating frequency of the cable 30. Thereby, in each insulated conductor strand 1a located in the outermost layer of the cable 30, it is possible to prevent the internal electrical resistance (high frequency resistance) from increasing due to the skin effect. Further, the diameter of the insulated wire 1a is 1/90 or more of the diameter of the cable 30. This prevents the diameter of the insulated wire 1a from becoming excessively small and the number of the insulated wires 1a from increasing too much, thereby suppressing an increase in the manufacturing cost of the cable 30.

Further, in this embodiment, the insulated conductor strands 1a are assembled through n assembly steps. Specifically, here, the cable 30 is constructed by assembling the insulated conductor wire 1a and other dielectric wires through three assembly steps. Here, in at least two or more assembling steps, the assembling lines to be used are selected based on the following first and second criteria.

As a first criterion, the n-1st order assembled line created in the (n-1)th assembly process is used for the assembly line exposed on the outermost layer when the nth assembly process is completed. In other words, the n-th order set line is formed by bundling (n-1) order set lines.

As a second criterion, dielectric wires are used for at least some of the components that are not exposed to the outermost layer when the n-th assembly process is completed. In other words, dielectric wires are used for some of the components that are not exposed to the outermost layer among the elements that constitute the n-th order aggregated wire.

In this way, in this embodiment, by using a dielectric element wire for the element wire that never goes out to the outermost layer, it is possible to reduce the electrical resistance at high frequencies and to reduce the amount of conductor used. It is possible to create a cable that can do this. Further, by using a dielectric wire made of a dielectric material that is lighter than the conductor constituting the insulated conductor wire, the weight of the cable can be reduced. In this way, the above-mentioned points can eliminate the room for improvement.

For example, if the insulated conductor strand ratio of the Litz wire shown in FIG. 7 is 100%, the insulated conductor strand ratio of the cable 30 of the present embodiment shown in FIG. This greatly reduces the amount of conductor used. Here, the amount of conductor used can be suppressed to 1/2 or less of that of Comparative Example 1.

Note that when the diameters of the wires constituting the cables of Comparative Example 1 and this embodiment are approximately the same, the high frequency resistance of this embodiment may be slightly larger than that of Comparative Example 1. However, by increasing the outer diameter of the cable 30 and increasing the amount of conductors used to about twice or less, it is possible to realize a cable 30 that has lower high frequency resistance and uses a smaller amount of conductors than Comparative Example 1.

In this embodiment, when manufacturing an assembled wire by a twisting, multiplication, or braiding process, a practical assembled wire can be obtained by following the above criteria. Here, if the primary bundled wire 10, the secondary bundled wire 20, or the cable (tertiary bundled wire) 30 is a twisted wire, the arrangement (arrangement) of the insulated conductor strands 1a is adjusted along the length of the cable 30 by twisting. change in direction. Therefore, even if the insulated conductor strand 1a is not exposed to the outside in a cross section at a predetermined location, it is located in the outermost layer of the cable 30 in a cross section at other locations. That is, in all of the insulated conductor strands 1a used in the cable 30, high frequency resistance can be reduced and current can flow.

Further, the cross-sectional shape of each of the primary assembled lines 10 and 11, the secondary assembled lines 20 and 21, and the cable 30 is approximately hexagonal. Since the cross-sectional shape is hexagonal, the component wires or assembled wires can be bundled without gaps, and the diameter of the cable can be reduced.

<Modification 1>
FIG. 2 shows a cross-sectional view of the cable 31 of this modification. The configuration of the cable 31 of this modification is the same as the configuration of the cable 30 shown in FIG. It is. However, the cable 31 is similar to FIG. It is different from the cable 30 shown. In other words, the secondary set line 22 is composed only of the plurality of primary set lines 10.

That is, the cable 31 is a tertiary assembled wire, and a plurality of secondary assembled wires 22 are arranged so as to surround a secondary assembled wire 21 consisting of a plurality of dielectric wires 1d bundled into one. It consists of: Further, the secondary set line 22 is configured by arranging a plurality of primary set lines 10 so as to surround the periphery of the first set line 10. Further, the primary wire assembly 10 is configured by arranging a plurality of insulated conductor wires 1a so as to surround a plurality of dielectric wires 1b bundled into one.

In this way, even though the central bundle of secondary bundled wires 22 in the outermost layer of the cable 31 has the insulated conductor strands 1a in the outermost layer, the high frequency resistance is lower than that of Comparative Example 1, and the amount of conductor used is lower. It is possible to realize a cable with a small size. Since the amount of conductor in the secondary assembled wire 22 is larger than that of the secondary collected wire 20 shown in FIG. 1, when the cable 30 and the cable 31 shown in FIG. Can reduce resistance.

If the insulated conductor strand ratio of the litz wire shown in FIG. 7 is 100%, the insulated conductor strand ratio of the cable 31 shown in FIG. 2 is 42%. In other words, compared to Comparative Example 1, the amount of conductor used can be reduced to 1/2 or less.

<Modification 2>
FIG. 3 shows a cross-sectional view of the cable 32 of this modification. The configuration of the cable 32 of this modification is the same as the configuration of the cable 30 shown in FIG. 1, except that it has the secondary bundle line 20 as the central bundle line. In other words, the cable 32 is composed only of the secondary assembled wires 20.

That is, the cable 32 is a tertiary assembled line, and is configured by arranging a plurality of secondary assembled lines 20 so as to surround the secondary assembled line 20. Further, the secondary assembled wire 20 is constructed by arranging a plurality of primary assembled wires 10 so as to surround the primary assembled wire 11 made up of a plurality of dielectric wires 1c bundled into one. ing. Moreover, the primary wire assembly 10 is configured by arranging a plurality of insulated conductor strands 1a so as to surround a plurality of dielectric strands 1b bundled into one.

In this way, even though the central bundle of the cable 32 has the primary bundled wire 10 including the insulated conductor strands 1a in the outermost layer, the high frequency resistance is lower than that of Comparative Examples 1 and 2, and the amount of conductor used is lower than that of Comparative Examples 1 and 2. It is possible to realize a cable with a small size. Since the amount of conductor of the secondary assembled line 20, which is the center bundle line of the cable 32, is larger than the secondary assembled line 21 shown in FIG. 1, when the external shapes of the cable 30 and the cable 32 shown in FIG. Cable 32 can reduce high frequency resistance more than cable 30.

If the insulated conductor strand ratio of the litz wire shown in FIG. 7 is 100%, the insulated conductor strand ratio of the cable 32 shown in FIG. 3 is 42%. In other words, compared to Comparative Example 1, the amount of conductor used can be reduced to 1/2 or less.

<Modification 3>
FIG. 4 shows a cross-sectional view of the cable 33 of this modification. The cable 33 of this modification has a structure in which a plurality of secondary bundled wires 22 made up of only a plurality of primary bundled wires 10 are bundled.

That is, the cable 33 is a tertiary assembled line, and is configured by arranging a plurality of secondary assembled lines 22 so as to surround the secondary assembled line 22. Further, the secondary set line 22 is configured by arranging a plurality of primary set lines 10 so as to surround the periphery of the first set line 10. Moreover, the primary wire assembly 10 is configured by arranging a plurality of insulated conductor strands 1a so as to surround a plurality of dielectric strands 1b bundled into one.

In this way, all the primary assembled wires are composed of a plurality of dielectric strands 1b bundled into one and a plurality of insulated conductor strands 1a surrounding the outer periphery of the plurality of dielectric strands 1b. Even if the cables have a lower high-frequency resistance than Comparative Examples 1 and 2 and use a smaller amount of conductor, it is possible to realize a cable. Since the cable 33 does not have a primary assembled wire made of only dielectric wires and a secondary collected wire made only of dielectric wires, the external shapes of the cable 30 and the cable 33 shown in FIG. If they are the same, cable 33 can reduce high frequency resistance more than cable 30.

If the insulated conductor strand ratio of the litz wire shown in FIG. 7 is 100%, the insulated conductor strand ratio of the cable 33 shown in FIG. 4 is 49%. In other words, compared to Comparative Example 1, the amount of conductor used can be reduced to 1/2 or less.

<Modification 4>
FIG. 5 shows a cross-sectional view of the cable 34 of this modification. The cable 34 of this modification is a secondary assembled line, and its configuration is the same as the configuration of the secondary assembled line 20 shown in FIG.

That is, the cable 34 is constructed by arranging a plurality of primary assembled wires 10 so as to surround a primary assembled wire 11 made up of a plurality of dielectric wires 1c bundled together. Moreover, the primary wire assembly 10 is configured by arranging a plurality of insulated conductor strands 1a so as to surround a plurality of dielectric strands 1b bundled into one.

In this way, even if the cable 34 is a secondary bundled wire, it is possible to realize a cable that has lower high frequency resistance than Comparative Examples 1 and 2 and uses a smaller amount of conductor.

If the insulated conductor strand ratio of the litz wire shown in FIG. 7 is 100%, the insulated conductor strand ratio of the cable 25 shown in FIG. 8 is 86%, and the insulated conductor strand ratio of the cable 34 shown in FIG. 5 is 49%. %. That is, compared to Comparative Example 1, the amount of conductor used can be suppressed to 1/2 or less, and even compared to Comparative Example 2, the amount of conductor used can be reduced.

<Modification 5>
FIG. 6 shows a cross-sectional view of the cable 35 of this modification. The configuration of the cable 35 of this modification is the same as the configuration of the cable 30 shown in FIG. 1 in that it has the secondary bundled wire 21 made of dielectric material as the central bundled wire. However, in the primary bundled wire 12 constituting the outermost layer of the secondary bundled wires 23 in the outermost layer of the cable 35, the outermost layer and the layer one layer inside thereof are composed of a plurality of insulated conductor strands 1a.

That is, the cable 35 is a tertiary assembled wire, and a plurality of secondary assembled wires 23 are arranged so as to surround a secondary assembled wire 21 consisting of a plurality of dielectric wires 1d bundled into one. It consists of: Further, the secondary assembled wire 23 is constructed by arranging a plurality of primary assembled wires 12 so as to surround the primary assembled wire 11 made up of a plurality of dielectric wires 1c bundled into one. ing. Moreover, the primary assembled wire 12 is configured by arranging a plurality of insulated conductor wires 1a in two layers so as to surround a plurality of dielectric wires 1b bundled into one. That is, among the plurality of strands constituting the primary strands 12 in the outermost layer of the secondary strands 23, the strands in the outermost layer of the primary strands 12 and the strands in the outermost layer of the primary strands 12 The wire in the layer one layer inside is the insulated conductor wire 1a.

In this way, even if the outermost layer of the primary wire assembly 12 and the layer one layer inside from the outermost layer are composed of a plurality of insulated conductor strands 1a, the high frequency resistance is lower than that of Comparative Example 1, and the conductor It is possible to realize a cable that uses a small amount. Since the amount of conductor of the primary assembled wire 12 is larger than that of the primary assembled wire 10 shown in FIG. 1, when the external shapes of the cable 30 and the cable 35 shown in FIG. Can reduce resistance.

If the insulated conductor strand ratio of the litz wire shown in FIG. 7 is 100%, the insulated conductor strand ratio of the cable 34 shown in FIG. 6 is 69%. In other words, compared to Comparative Example 1, the amount of conductor used can be reduced.

Although the invention made by the present inventor has been specifically explained based on the embodiments above, the present invention is not limited to the embodiments described above, and various changes can be made without departing from the gist thereof. Needless to say.

1a Insulated conductor strands 1b, 1c, 1d, 1f Dielectric strands 10 to 12 Primary bundled wires 20 to 23 Secondary bundled wires 30 to 36 Cable

Claims (9)

A cable that is an n-th order set line (n: natural number, n>1),
The nth-order set line includes a plurality of n-1st-order set lines bundled into one,
Each of the plurality of n-1 order aggregated wires includes a plurality of strands bundled into one,
Among the plurality of strands constituting the n-1st-order strands in the outermost layer of the n-th-order strands, the outermost strands of the n-1st-order strands are insulated with a conductor and an insulating coating. It is a conductor wire,
Among the plurality of strands constituting the n-1st order assembled line, some of the plurality of strands located inside the outermost layer of the strands of the n-1st order assembly line are made of a dielectric element. is a line,
The n-1st-order collected wire in the outermost layer of the n-th-order collected wire includes a plurality of the dielectric wires bundled into one, and a plurality of the insulated conductor wires surrounding the plurality of dielectric wires. A cable made up of wires and . The cable according to claim 1,
The cable, wherein the diameter of the conductor of the insulated conductor strand is smaller than the skin thickness at the operating frequency of the cable. The cable according to claim 1 or 2,
If n>2,
Among the plurality of n-1-order set lines constituting the n-th order set line, the n-1-order set line in the outermost layer of the n-th order set line is a plurality of n-2 order set lines bundled into one. Equipped with a collection line,
Among the plurality of wires constituting the n-2nd order grouped wire in the outermost layer of the n-1st order grouped wire, the strands in the outermost layer of the n-2nd order grouped wire are the insulated conductor strands. can be,
Among the plurality of wires constituting the n-secondary assembled line, some of the plurality of wires located inside the outermost layer of the n-secondary assembled line are connected to the dielectric material. A cable that is a bare wire. The cable according to claim 3,
The cable, wherein the n-1st-order assembled wires inside the n-1st-order collected wires in the outermost layer of the n-order collected wires are constituted by a plurality of the dielectric wires bundled into one. The cable according to claim 3,
The n-2nd order grouped line inside the n-2nd order grouped line in the outermost layer of the n-1st order grouped line is constituted by a plurality of the dielectric strands bundled into one. cable. The cable according to claim 1 or 2,
The cable, wherein the n-1st-order assembled wires inside the n-1st-order collected wires in the outermost layer of the n-order collected wires are constituted by a plurality of the dielectric wires bundled into one. The cable according to any one of claims 1 to 6,
Of the plurality of strands constituting the n-1st-order set line in the outermost layer of the n-1st-order set line, the outermost layer of the n-1st-order set line and the n-1st-order set line. The wire in the layer one layer inside the wire in the outermost layer is the insulated conductor wire. The cable according to any one of claims 1 to 7,
The cable, wherein the arrangement of the plurality of insulated conductor strands changes in the extending direction of the cable. The cable according to any one of claims 1 to 8,
The cable has a working frequency of 10 kHz to 1 MHz.

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