JPH0660732A - Manufacture of litz wire and manufacturing device thereof - Google Patents

Abstract

PURPOSE:To provide a litz wire having an excellent characteristic by evenly dividing segments formed out of respective strand bundles radially from the center into six sections in the sectional shape of the litz wire collectively twisted with six strand bundles together, preventing a cavity from occurring in the central part between each segment, and heightening peripheral cicrularity of the sectional shape of the litz wire. CONSTITUTION:A bar 20 penetrates a through hole 17 in the center of a rotary disk 16 for stranding. Respective strand bundles 7 are fed out from six feeding- out bobbins 18 located on the rotary disk 16 for twisting to the periphery of the bar 20. The rotary disk 16 for twisting and the bar 20 are synchronously rotated so as to twist the strand bundles 7 having the bar 20 as the center. Directly after passing the bar 20 and in a state where a group of the twisted strand bundles 7 is in the shape of a coaxial straight line with the bar 20, sheath winding is performed on the periphery thereof. Produced litz wire 6 is continuously taken up on a take-up bobbin 31.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for manufacturing a litz wire in which a plurality of strands of strands or braided wires used for propagation of high frequency current are twisted together.

[0002]

2. Description of the Related Art Generally, transformers used in electronic equipment have low conversion efficiency because the frequency of commercial power source is as low as 50-60 Hz. On the other hand, in order to reduce the size and weight of a transformer used in an electronic device, it is necessary to increase the conversion efficiency of the transformer. To increase the conversion efficiency,
In many cases, high frequency conversion is performed on the input side for use as a transformer input. When a high-frequency current is passed in this way, the amount of current flowing through a wire having the same thickness in a single wire decreases due to the skin effect of the high-frequency current as compared with a low frequency. In order to reduce such a skin effect, it is widely used to increase the surface area of the wire and reduce the high frequency resistance by using a litz wire formed by twisting many individually insulated thin wires. Such litz wire is mainly used in devices such as switching transformers used in high-frequency electronic devices, deflection yokes for displays, coils for electromagnetic cookers, and the like.

The litz wire used for these is, for example,
Three to several thousand multi-purpose general-purpose polyurethane copper wires with a diameter of 0.03 to 0.3 mm are twisted together. The rope may be used as it is, but in order to prevent loosening, it is possible to wind the tetron thread, silk thread, etc. horizontally, or to apply a thermoplastic resin paint typified by polyamide to the wire beforehand. , It is also fused by heat when twisting. In addition, when the number of twists is several tens or more, it is common to divide the twisting process into two or more times, pre-twist or braid a plurality of strands, and further twist a plurality of strands. Has been done.

Originally, it is desirable that the litz wire satisfies the following conditions in order to efficiently pass the current flow under the skin effect. First, it is necessary to twist each wire so that, in the final twisted shape, the central portion where current hardly flows and the outer peripheral portion where current easily flows are crossed evenly. Second, it is necessary that the length of each of the twisted wires is the same, and the resistance per length of each wire is also equal.
Thirdly, it is desirable that the cross-sectional shape of the final twisted shape is also a perfect circle. Fourthly, in the cross section of the final twisted shape, the areas of the segments divided for each wire bundle also need to be equal. In order to realize these conditions, it is ideal to arrange all the strands that compose the entire twisted wire to the working length and to collectively twist the strands at one time. However, in reality, several hundred to several tens
Even if a large number of 00 wires are cut and held to the same length and they are twisted together at the same time, it is probabilistic that each wire will evenly intersect the outer circumference and the center of the entire stranded wire. It is low, and the stability of the properties is rather poor.

Therefore, in practice, various twisting methods as shown in FIGS. 4 to 9 are adopted. First, in order to ensure the roundness of the cross-sectional shape of the entire twisted wire in mass production, a collective twist of three wire bundles 1 each having a circular cross section as shown in FIG. 4 or 7 wires as shown in FIG. The concentric twist of the wire bundle 1 is relatively good. That is, according to these twisting methods, a twisted wire having a relatively stable shape can be obtained. On the other hand, the roundness of the cross-sectional shape of the twisted wire is likely to be broken by other twisting numbers and twisting methods as shown in FIGS. 6 and 7. 4 to 8, (a) shows a state in which the stranded wire has just been twisted, and (b) shows a state in which the stranded wire is tightened by a sheath winding process or the like. By the way, when the number of strands 1 to be twisted is three, collective twisting as described above is possible, and the roundness of the cross-sectional shape is easily obtained.
As described in Japanese Patent No. 726, the total twist number is 3 n.
It is necessary to repeat twisting only n times as a power, and workability is poor. Further, when the number of the strands 1 of the strands to be twisted is 7, the strands are concentric, and one strand of the strand 1 does not cross-seed with other strands of the strand 1 as a twist center, so that the high frequency propagation property is deteriorated.

On the other hand, as shown in FIG. 8, instead of the conductive wire, one of the cores of the concentric twist of the seven wire bundles 1 is replaced with another insulating material, for example, a bundle 2 of synthetic resin threads. This is effective for high frequency propagation and is widely used as described in Japanese Patent Publication No. 4-25644.
However, in this case, the cross-sectional area of the litz wire increases by the thickness of the yarn bundle 2 arranged at the center, and the size of equipment such as a transformer that uses this litz wire becomes large. Further, as shown in FIG. 9, a method of concentrating 7 strands of wire 1 concentrically as in the conventional method, and after pulling out the center one after cutting to a fixed length, realizes a collective twist of 6 strands of wire 1. Is also taken.
In addition, in FIG. 9, (a) is a state in which seven strands of wire 1 are twisted, (b) is a state in which the central one is pulled out, (c),
(D) shows a state in which the stranded wire is then tightened. However, with this method, although the number of twists of the six wire bundles 1 can be secured, the cross section of the whole twisted wire by each wire bundle 1 is evenly divided, the mutual holding property of the twisted wire bundles 1 and the cross section of the whole twisted wire. There is a problem in the roundness of the shape, and since it requires constant length cutting, it is not possible to obtain a continuous long Litz wire.

[0007]

As described above, in the conventional litz wire, which is based on collective twisting of three wire bundles, when the number of twists is increased, the workability of twisting deteriorates. Also, a concentric twist of seven wire bundles has a problem of poor high frequency propagation. Further, in order to improve these drawbacks, one in which one of the cores of concentric twist of seven strands of wire is replaced with a bundle of synthetic resin yarns instead of the conductive wire rods is a bundle of yarns not involved in conduction. This increases the cross-sectional area of the litz wire and causes the size of equipment that uses this litz wire to increase. Also, after cutting a standard length, the method of pulling out one of the concentric twist centers of the seven wire bundles is In addition to the problems of reliability and stability of characteristics, there was a problem that a continuous long Litz wire could not be obtained because a standard length cutting was required.

The present invention is intended to solve such a problem, and can realize continuous collective twisting of, for example, six strands of wire without twisting another insulating material in the center of the twisted wire. Moreover, it is an object of the present invention to obtain a litz wire excellent in reliability and stability of shape and characteristics.

[0009]

The present invention is intended to achieve the above object, and the invention of claim 1 is a method for producing a litz wire in which a plurality of strands of strands or braids are twisted together. In the above, a plurality of wire bundles are fed around a linear support member, and are twisted while being arranged around this support member and along the axial direction thereof, and immediately after passing through the support member, the twisted elements are twisted together. In the state where the wire bundle group is in a straight line coaxial with the support member, the sheath wire is wound around the outer circumference of the wire bundle group, and the wire bundle group is wound.

Further, the invention of claim 2 is, in a litz wire manufacturing apparatus for twisting a plurality of strands of strands or braided wires, in a linear support member and a plurality of radial members with respect to the support member. And a twisting mechanism section for feeding the wire bundle from each of the wire bundle supply sections to the outer periphery of the support member and rotating the wire bundle for twisting the wire bundle, and is disposed near the tip of the support member. A sheath winding mechanism portion that rotates around an axis of rotation that is coaxial with the support member and is wound around the outer circumference of the wire bundle group that is twisted and twisted, and the sheath is wound in a linear state that is coaxial with the support member. And a winding unit for winding the group of wire bundles.

[0011]

In the method for manufacturing a litz wire according to the first aspect of the present invention, a plurality of wire bundles are fed around the supporting member and are twisted while being arranged around the supporting member and along the axial direction thereof. For example, collective twisting of six wire bundles is possible. Then, the twisted wire bundle group passes through the support member, and immediately after this passing, the sheath wire is wound around the outer circumference of the wire bundle group and tightened to form a litz wire having no cavity in the center part inside. Along with this, the outer circumference of the cross-sectional shape of the litz wire becomes close to a perfect circle by continuously performing from the beginning of twisting to the completion of sheath winding on a straight line, and each wire bundle is from the center in the cross section of the litz wire. The segments are evenly divided radially.

The litz wire manufacturing apparatus of the invention of claim 2 is
It is for carrying out such a method for manufacturing a litz wire, in which the strand wire bundles are respectively fed from the respective strand wire bundle supply portions of the twisting mechanism portion to the outer periphery of the supporting member, and the twisting mechanism portion is rotated integrally with the supporting member. Then, the wire bundle is twisted while being arranged with the support member as the center and along the axial direction thereof. Then, at the tip of the support member, the sheath winding mechanism that rotates about a rotation axis coaxial with the support member performs sheath winding processing on the outer circumference of the twisted wire bundle group immediately after passing through the support member. In this way, the wire bundle group wound with the sheath in a straight line coaxial with the support member is
It is wound up by the winding section.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. The manufactured litz wire 6 is obtained by collectively twisting six strands of wire 7 made of twisted wires, and tetron yarn 8 as a sheath material is wound around the outer circumference of the twisted strands of wire bundles 7 (strands). It will be.

FIG. 1 shows an apparatus for manufacturing the litz wire 6. This manufacturing apparatus includes a twisting mechanism section 11 for twisting six wire bundles 7, a sheath winding mechanism section 12 for applying a sheath winding process to the outer circumference of a group of twisted wire bundles 7, and a Ritz device for sheath winding processing. And a winding unit 13 for winding the wire 6. The twisting mechanism section 11, the sheath winding mechanism section 12, and the winding section 13 are located in a straight line. As shown in FIG. 2, the twisting mechanism section 11 has a twisting rotating disk 16 that rotates in the direction indicated by arrow A.
A disk-shaped through hole 17 is formed in the central portion of 16.
Further, on the back surface of the twisting rotary disk 16, six feeding bobbins 18 as wire bundle supplying portions are rotatably arranged side by side at equal intervals on a circumference centered on the center of the twisting rotary disk 16. . Each of these feeding bobbins 18 has a single wire bundle 7 wound thereon.
It is a thing to pay for. Further, a bar member 20 as an elongated columnar support member is fixed to the twisting rotary disk 16 via a frame 19. This bar 20
It is positioned coaxially with the center axis of the twisting rotary disk 16, that is, the rotation axis, and penetrates the through hole 17 coaxially. It is desirable that the rod member 20 has a diameter corresponding to the diameter of the wire bundle 7 and the tip portion 21 is thin like a spindle. In addition,
The diameter of the through hole 17 is 1.5 to 2 times the final twisted diameter of the six wire bundles 7 including the rod 20. Further, the sheath winding mechanism section 12 has a sheath rotary disc 26 that is positioned in front of the twist rotary disc 16 in parallel. The sheath rotary disc 26 has the same rotational axis as the twist rotary disc 16 in the direction indicated by arrow B, that is, the twist rotary disc 16
And is to rotate in the opposite direction. The back surface of the rotating disk for sheath 26 is located slightly forward of the tip of the rod 20. Further, a through hole 27 is formed in the central portion of the rotary disc for sheath 26. And rotating disk for sheath
On the back surface of 26, a pair of feeding bobbins 28 are provided rotatably at symmetrical positions with the center of the rotary disk 26 for the sheath interposed therebetween.
Each of these feeding bobbins 28 has one tetron yarn 8 wound thereon, and the tetron yarn 8 is fed toward the through hole 27. Further, the winding unit 13 is
It has a winding bobbin 31. The take-up bobbin 31 rotates in a direction indicated by an arrow C, and its rotation axis has a directionality substantially orthogonal to the rotation axes of the both rotary disks 16 and 26.

Next, a method of manufacturing the litz wire 6 using this apparatus will be described. By the tension applied from the rotating winding bobbin 31, the wire bundles 7 are continuously fed out at a constant speed from the respective six feeding bobbins 18 in the twisting rotary disk 16. These wire bundles 7 are radially gathered toward the center of the twisting rotary disk 16 and the through holes are formed.
Along the outer circumference of the bar 20 through 17 and the tip 21 of this bar 20
Is pulled out to. And the twisting rotary disc 16 and the bar
The 20 and the unit are synchronously rotating, but this rotation causes
As shown in FIG. 3A, the six wire bundles 7 are densely arranged and twisted around the outer periphery of the rod 20 with the dummy rod 20 as an axis. In this way, the six wire bundles 7 are twisted while arranging them around the rod 20 and along the axial direction thereof, but the group of twisted wire bundles 7 has passed through the tip 21 of the rod 20. At this point in time, as shown in FIG. 3 (b), the cross-sectional shape becomes a stranded wire composed of segments that are radially and evenly divided into 6 parts from the center of the group 7 of wire bundles. However, a hollow portion is left in the central portion between the segments, although the diameter is smaller than that of the rod 20. Then, immediately after passing through the tip portion 21 of the rod 20, the tetron yarn 8 is wound around the outer circumference of the group of strands 7 (twisted wire) in the sheath winding mechanism portion 12 in a horizontal direction. That is, as the sheath rotary disc 26 rotates, the Tetoron yarn 8 is delivered from the pair of delivery bobbins 28 in the sheath rotary disc 26 and wound around the group of wire bundles 7 at a fine pitch. In this sheath winding process, the wire bundle 7 group is made of the bar material 20.
It is done in a straight line coaxial with. And
With such sheath winding, the group of wire bundles 7 is bundled in a circular cross section and uniformly by the Teflon yarn 8, and
The litz wire 6 does not have a cavity at the center between the segments made of the individual wires 7. After that, the litz wire 6 is wound on a bobbin.
It is wound up in 31. When the litz wire 6 having a predetermined length is wound around the winding bobbin 31, the winding bobbin 31 around which the litz wire 6 is wound is taken out from the device. In this way, a series of processes from the beginning of twisting to the sheath winding process is performed linearly and continuously.

According to the configuration of the above embodiment, collective twisting of the six wire bundles 7 can be realized. Then, as shown in FIG. 3 (c), the litz wire 6 is at an arbitrary position in the axial direction,
The cross-sectional shape of the outer shape is close to a perfect circle. At the same time, in the cross-sectional shape, the segments composed of the individual wire bundles 7 are individually and radially 6 from the center of the group of wire bundles 7.
It is divided and has no cavity in the center between the segments. Further, such shape stability is maintained even after manufacturing. In this way, it is possible to provide a highly reliable litz wire 6 having stable high-frequency propagation characteristics. In order to obtain the Litz wire 6 having such an excellent shape and characteristics, the twisting mechanism portion 11 having the rod member 20 for twisting the wire bundles 7 and the sheath winding mechanism portion 12 for the sheath winding process have the same straightness. Must be done continuously on the line. For example, if a twisted wire finished only with a twisting mechanism is once wound on a bobbin, and then sheath winding is applied to the twisted wire in a separate process, the shape of the twisted wire segment collapses,
Wires that make up each segment easily invade adjacent segments, and the cross-sectional shape of the stranded wire is not circular,
It tends to have an irregular shape such as an ellipse. Further, the method of the above-mentioned embodiment also has an advantage of high production efficiency. Further, as compared with the method of concentrically twisting the seven strands of wire and then pulling out the central one, it is possible to obtain a continuous long Litz wire 6 without the need for regular length cutting. Further, since no other insulating material is twisted in the center of the stranded wire, the cross-sectional area of the litz wire 6 can be reduced, and thus the equipment using the litz wire 6 can be downsized.

The present invention is not limited to the above embodiment, and various modifications can be made. For example,
The rotating bodies of the twisting mechanism section and the sheath winding mechanism section are not limited to the disks 16 and 26 as in the above-described embodiment. Further, in the sheath winding mechanism portion of the above-mentioned embodiment, in order to wind the two Tetron threads 8, a pair of feeding bobbins 28 are provided on one sheath rotary disk 26 to perform the sheath winding in one step. However, the sheath winding may be performed in two steps. Furthermore, although the wire bundle 7 is a stranded wire in the above-described embodiment, the wire bundle may be any wire bundle whose cross-sectional shape is easily deformable, and may be, for example, a braided wire in which a large number of wire materials are braided. . The sheath material is not limited to the Tetoron yarn. Furthermore, in the above-mentioned embodiment, the six wire bundles 7 are twisted, but the number of wire bundles to be twisted is not limited to six, and may be eight or nine.

[0018]

According to the first aspect of the present invention, a plurality of wire bundles are fed around the support member and are twisted while being arranged around the support member and along the axial direction thereof. It is possible to realize collective twisting of six wire bundles. Then, the twisted element wire bundle group passes through the support member, and immediately after this passage, the twisted element wire bundle group is in a straight line coaxial with the support member, and the sheath is attached to the outer circumference of the wire element bundle group. Since it is wound, the outer circumference of the cross-sectional shape is close to a perfect circle, and the segment consisting of each wire bundle is evenly divided radially from the center in the cross section, and there is no cavity in the center between the segments. ,
It is possible to provide a highly reliable litz wire having stable high-frequency propagation characteristics. Further, compared to a method of concentrically twisting a bundle of seven strands and then pulling out the central one, it is possible to obtain a continuous long litz wire without the need of cutting to a constant length. Furthermore, since no other insulating material is twisted in the center of the stranded wire,
The cross-sectional area of the litz wire can be reduced, and thus the equipment using this litz wire can be miniaturized.

In such a method for manufacturing a litz wire, the twisting mechanism portion having the supporting member, the sheath winding mechanism portion coaxially arranged near the tip of the supporting member, and the winding are provided. It can be reliably performed by a manufacturing apparatus having a take-up section.

[Brief description of drawings]

FIG. 1 is a schematic explanatory perspective view of an entire litz wire manufacturing apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic explanatory cross-sectional view of a twisting mechanism section and a sheath winding mechanism section of the same.

FIG. 3 is a cross-sectional view of a stranded wire portion in each step of the same as above.

FIG. 4 is a sectional view showing a first example of a conventional Litz wire.

FIG. 5 is a sectional view showing a second example of a conventional litz wire.

FIG. 6 is a sectional view showing a third example of a conventional litz wire.

FIG. 7 is a sectional view showing a fourth example of a conventional litz wire.

FIG. 8 is a sectional view showing a fifth example of a conventional litz wire.

FIG. 9 is a sectional view showing a sixth example of a conventional litz wire.

[Explanation of symbols]

 6 Litz wire 7 Element wire bundle 11 Twisting mechanism section 12 Sheath winding mechanism section 13 Winding section 18 Feeding bobbin (element wire bundle supply section) 20 Bar material (support member)

Claims (2)

[Claims] 1. A method for producing a litz wire in which a plurality of strands of strands or braids are twisted together, and a plurality of strands of wire are fed around a linear support member, and the support member is used as a center. And, while being twisted while arranging along the axial direction, and immediately after passing through the supporting member, the twisted element wire bundle group is in a state of being in a straight line coaxial with the supporting member, and a sheath is provided on the outer periphery of the element wire bundle group. A method for producing a litz wire, characterized in that the wire bundle is wound and the wire bundle group is wound. 2. A litz wire manufacturing apparatus for twisting a plurality of strand bundles of twisted wires or braided wires, comprising a linear support member and a plurality of strand bundle supply units radially arranged with respect to the support member. Then, a twisting mechanism part for feeding and twisting the wire bundle from each of the wire bundle supply parts to the outer periphery of the support member, and a twisting mechanism part arranged near the tip of the support member and coaxial with the support member. A sheath winding mechanism that rotates around an axis of rotation about the outer circumference of a wire bundle group that is twisted and twisted, and winds the sheath-wound wire bundle group in a linear shape coaxial with the support member. A litz wire manufacturing apparatus comprising a winding section.