JPH06119818A - Terminal looseness preventing litz wire - Google Patents

Abstract

PURPOSE:To prevent looseness of a terminal so as to facilitate a terminal treatment by twisting a plurality of enamel element wires, and sticking an adhesive tape around the enamel element wires along the longitudinal direction. CONSTITUTION:Twisted enamel element wires 3 are covered with an adhesive tape 4 having a predetermined width with the adhesive surface 4a thereof contacted with the enamel element wires 3, thus constituting a terminal looseness preventing litz wire 5. The adhesive tape 4 is stuck along the longitudinal direction around the twisted enamel element wires 3. The appearance of the adhesive tape 4 accords with that of the terminal looseness preventing litz wire 5 in the longitudinal direction. The adhesive tape 4 are crossed across the enamel element wires 3 in sequence according to the twisting of the enamel element wires 3. In this case, the twisting pitch of the enamel element wire 3 is not limited, and the entirety of the enamel element wires 3 exposed outside is brought into contact with the adhesive tape within 1 pitch from the cross section despite of any twisting pitch.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a litz wire formed by twisting a plurality of enameled wire strands, and more particularly to a litz wire for preventing terminal dislocation which prevents terminal dislocation and facilitates terminal processing. Is.

[0002]

2. Description of the Related Art A litz wire formed by twisting enamel wire strands has been used for a long time in high frequency communication equipment and the like. This is because when a single conductor is used, the AC resistance increases and the loss increases due to the skin effect as the frequency of the applied current increases. It is made with the idea of avoiding the skin effect by covering with. That is, relatively thin strands are used for the enamel strands that form the individual conductors, an enamel insulating coating is applied around the strands, and the desired number of enamel strands are collected to obtain the required disconnection. The area is secured, and these enamel wire strands are twisted and integrated.

In recent years, along with miniaturization and high performance of electric and electronic equipment and energy saving, for example, high frequency of inverter control, high frequency of FBT drive frequency of deflection yoke of television, and the like have been achieved. Therefore, the demand for litz wire is increasing.

The structure of a conventional litz wire is shown in FIG. In this example, seven enamel wire strands are used, and six enamel wire strands are twisted around one wire as a center. In addition to this, there are various structures, and methods of twisting such as concentric twist and collective twist are known.

[0005]

By the way, when the litz wire is cut, the strain stress at the end of twisting at the time of twisting is released at one time, and the individual wires tend to be separated. Due to such terminal variation, there is a problem that the terminal processing at the time of coil winding becomes very troublesome. That is, after winding the coil, when the litz wire is cut, the twist is returned and the ends are separated, which makes it difficult to process the ends thereafter.

When the twisting method is the compound twisting, the variation of the terminals is less than that of the concentric twisting and the collective twisting. However, in the case of the composite twist, the diameter of the strand becomes smaller than that in the case of the concentric twist having the same cross-sectional area and the collective twist, and the number of the strands increases significantly. As a result, there is another problem that the price increases.

Further, even in the case of concentric twisting or collective twisting, there is a tendency that if the twisting pitch is made smaller, the terminals are less likely to vary. However, there is a problem in that it is not possible to eliminate terminal variations by reducing the twisting pitch, and when the twisting pitch is reduced, the twisting speed decreases and productivity deteriorates.

As a method of preventing the unevenness, a method of coating the outer periphery of the twisted wires and then applying an insulating material has been proposed (Japanese Patent Publication No. 34-280 / 56-18308).
issue). In these methods, after twisting, all the enameled wires are integrally fixed with a paint. It is possible to prevent disparity by fixing the wires to each other by painting. However, when the insulating material is applied, the coating of the insulating material must be peeled off when connecting the terminal to the terminal after the coil winding. It is difficult to remove this coating. In addition, since the flexibility is remarkably reduced, the coil winding and wiring are troublesome, which is an obstacle to miniaturization and high performance. Further, there is a problem that the manufacturing cost becomes considerably higher than that of the litz wire just twisted.

In the situation where the mass production of the litz wire is advancing along with the expansion of the use of the litz wire as in recent years, it is necessary to improve the workability of such terminal treatment while suppressing the manufacturing cost of the litz wire itself.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to solve the above problems and provide a litz wire for preventing terminal unevenness which prevents terminal unevenness and facilitates terminal processing.

[0011]

In order to achieve the above object, the present invention comprises a plurality of enamel wire strands twisted together, and an adhesive tape is attached to the outside thereof along the longitudinal direction.

Alternatively, a plurality of enameled wire strands may be twisted together, and the outer circumference thereof may be vertically attached and covered with a polyester film having an adhesive inner surface.

[0013]

With the above structure, since the adhesive tape is attached along the longitudinal direction of the litz wire, each twisted enamel wire strand must be in contact with the adhesive tape at any end or somewhere near the end. Will be. Therefore, the adhesive tape restrains the enameled wire elements adjacent to each other. Since all enameled wires are connected by adhesive tape, they never separate from the litz wire. Therefore, when the litz wire is cut and the terminal treatment is performed, variations do not occur, and the terminal treatment becomes easy.

Even when the outer surface of the litz wire is vertically attached and covered with a polyester film having an adhesive surface, the individual enameled wires are connected to each other as in the case where the above-mentioned adhesive tape is attached, and thus there is a dispersion. Prevention is achieved.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

The first embodiment of the present invention has a cross section shown in FIG.
As shown in FIG. 2, the enamel insulating coating 2 is applied to the conductor 1 having a predetermined relatively small diameter to form the enamel wire strands 3, and the enamel wire strands 3 are twisted together (7 in this case). ing. An adhesive tape 4 having a predetermined width is attached to the outer periphery of the enamel wire strands 3 with the adhesive surface 4a being in contact with the enamel wire strand 3 to form a litz wire 5 for preventing terminal dislocation.

The width of the adhesive tape 4 is, as shown in the figure, centered on one enameled wire 3a and on both sides of the enameled wire 3.
It reaches b, 3f. This width is not limited to this, and may be one that fits within the width of a single enameled wire or may cover three or more enameled wires.

The adhesive tape 4 is attached along the longitudinal direction of the outer circumference of the enamel wire strands 3 twisted together,
As shown in FIG. 2, the appearance is such that the longitudinal direction of the terminal dislocation preventing litz wire 5 and the longitudinal direction of the adhesive tape 4 are the same, and the adhesive tape 4 is twisted by twisting the enamel wire strands 3 to form each enamel wire. The strands 3 are sequentially crossed. At this time, the twisting pitch of the enamel wire strands 3 is not limited, and regardless of the twisting pitch, all of the enamel wire strands 3 appearing on the outer peripheral side within 1 pitch from the cross section,
It is in contact with the adhesive tape 4.

Next, the operation of the embodiment will be described.

When the litz wire 5 for preventing terminal dislocation is cut as shown in FIG. 2, in its cross section, as shown in FIG. Exist and these 3 enameled wires 3
Never leave each other. The other enameled wire 3 which is not in contact with the other adhesive tape 4 is free in this section,
At the position in the longitudinal direction, the adhesive tape 4 is always contacted within one pitch. Since the adhesive tape 4 is regulated at a position in contact with the adhesive tape 4, the enameled wire element 3 is hardly separated even in the cross section. Therefore, the litz wire 5 for preventing terminal unevenness does not cause unevenness wherever it is cut.

When performing terminal treatment such as soldering, each enameled wire element 3 can be separated as necessary by cutting the adhesive tape 4 to a desired length from the cross section.

Since it is not necessary to cover the entire circumference of the litz wire 5 for preventing terminal dislocations with the adhesive tape 4, it is sufficient to have the adhesive tape 4 having a predetermined width. Therefore, compared to the case of covering the entire circumference or applying the paint. Therefore, the flexibility is not impaired and the increase in volume is small. If a coil is wound by using the litz wire 5 for preventing terminal dislocation, it can be wound compactly and densely with a large curvature, and the space factor can be small.

The adhesive tape 4 is not particularly limited in its material for both the base material and the adhesive material, and a known material may be used.

A second embodiment of the present invention is shown in FIG. In this example, the enamel wire strand 3 is a copper wire having a polyurethane coating 6 as the enamel insulating coating 2. Seven enamel wires 3 are twisted together. A polyester film 8 having a relatively thin thickness is vertically provided on the outer periphery formed by twisting the enamel wires 3. The width of the polyester film 8 is slightly larger than the outer circumference formed by twisting the seven enamel wire strands 3, so that the entire enamel wire strand 3 is covered and the end portions 8a can be overlapped. The polyester film 8 may be attached by utilizing the adhesiveness of the polyester film 8 itself in the contact between the polyester films 8 at the ends 8 and the contact with each enameled wire element 3, or the inner surface. You may utilize the polyester film which added the adhesive material to.

Also in this structure, the movement of each enameled wire 3 is restricted as in the first embodiment, and there is no variation at the terminal. Moreover, when soldering, the terminals can be directly soldered after being immersed in the flux. That is, since the removal of the polyester film 8 and the polyurethane film 6 does not require a physical operation, the terminal treatment becomes easier.

The step of covering the polyester film 8 can be accomplished by vertically attaching the polyester film 8 while twisting the enamel wire strands 3. Since the polyester film 8 has adhesiveness, the adhesion is easy. Therefore, the manufacturing cost of the litz wire 5 for preventing terminal dislocation prevention is suppressed to an increase in material cost of the polyester film 8 as compared with the case where only the enamel wire 3 is twisted. Therefore, there is an advantage that the terminal variation can be prevented while suppressing the price.

In the first and second embodiments, seven enamel wires 3 are twisted together, but the number is not limited, and concentric twisting, collective twisting, and composite twisting are possible. Of course, it can be applied regardless of.

[0028]

The present invention exhibits the following excellent effects.

(1) Since there is no variation at the terminal, terminal processing becomes easy and productivity is improved.

(2) Since it suffices to attach a narrow adhesive tape or cover a thin polyester film, the increase in volume is small, and if the coil is wound by using this terminal dislocation preventing litz wire, the space factor is reduced. Can be small.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a terminal loosening prevention litz wire showing a first embodiment of the present invention.

FIG. 2 is a perspective view of a litz wire for preventing terminal unevenness in FIG.

FIG. 3 is a perspective explanatory view of a terminal dislocation preventing litz wire showing a second embodiment of the present invention.

[Explanation of symbols]

 1 conductor 2 enamel insulation film 3 enamel wire element wire 4 adhesive tape 8 polyester film

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akihiro Okabe 4-10-1 Kawajiri-cho, Hitachi-shi, Ibaraki Hitachi Cable Ltd. Toyoura factory

Claims (2)

[Claims] 1. A plurality of enamel wire strands are twisted together,
A litz wire for preventing terminal dislocation that is characterized in that an adhesive tape is attached to the outside along the longitudinal direction. 2. A plurality of enamel wire strands are twisted together,
A litz wire for preventing terminal dislocation, characterized in that the outer periphery thereof is vertically attached with a polyester film having an adhesive surface to cover it.