JP2016076316A - Insulated rectangular conductor wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an insulated rectangular conductor wire which suppresses film destruction and winkles (film floating) of an insulated film in a folded portion irrespective of the kind of a rectangular conductor wire, and has an insulated film excellent in insulation characteristics.SOLUTION: An insulated rectangular conductor wire includes: a rectangular conductor wire 10; and an insulated film coating the rectangular conductor wire 10. In the insulated rectangular conductor wire 1 where a predetermined bending working is scheduled, the insulated film includes: a first insulated film 11 coating the outer region where the bending working is scheduled in the outer periphery of the rectangular conductor wire 10; and a second insulated film 12 coating the inner region where the bending working is scheduled in the outer periphery of the rectangular conductor wire 10. The adhesiveness satisfies a relationship of first insulated film 11<second insulated film 12. The elongation satisfies a relationship of first insulated film 11>second insulated film 12.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an insulated flat wire suitable for applications such as coils.

  2. Description of the Related Art In recent years, in response to increasing demands for motor efficiency and miniaturization and weight reduction, a technique for increasing the space factor of a conductor in a motor coil is required. As a method of increasing the space factor of the conductor, there is a method of forming a coil by subjecting a rectangular conductor having a rectangular cross section to edgewise bending.

  However, there is a problem in that the insulation coating layer is broken and the insulation characteristics are deteriorated in the bent portion when the edgewise bending is performed, and the withstand voltage characteristic is likely to be lowered. In order to solve this problem, Patent Document 1 discloses an insulated rectangular copper including a rectangular copper wire formed of oxygen-free copper having a 0.2% proof stress of 150 MPa or less and an insulating coating layer covering the rectangular copper wire. Proposing a line.

JP 2013-004444 A

  In the above-mentioned Patent Document 1, by using a soft flat copper wire, an elongation strain is uniformly generated along the bent portion at the time of edgewise bending. Therefore, an excessive elongation strain that causes destruction in the insulating coating layer. It is described that generation | occurrence | production of can be suppressed. However, since the stress relaxation of the insulating coating layer in the bent portion is adjusted by using a soft flat copper wire, there is a problem that the strength of the entire coil is weak and impact resistance is weak.

  The present invention has been made in view of the above-mentioned background, and the object thereof is to suppress the film breakage and wrinkles (coating float) of the insulating film in the bent portion without depending on the type of the flat wire. An object of the present invention is to provide an insulated rectangular conducting wire having an insulating film having excellent insulating properties.

The insulated rectangular conducting wire according to the present invention comprises a rectangular conducting wire and an insulating coating that covers the rectangular conducting wire, and in an insulated rectangular conducting wire that has a predetermined bending plan,
The insulating coating is
A first insulating film covering an outer region of the outer periphery of the rectangular conducting wire to be bent;
A second insulating coating that covers an inner region of the rectangular conductive wire that is scheduled to be bent;
Adhesiveness satisfies the relationship of the first insulating coating <the second insulating coating,
The elongation satisfies the relationship of the first insulating film> the second insulating film.

  Since the insulating coating covering the inner side of the outer peripheral portion scheduled to be bent of the flat wire is shrunk, the insulating coating is likely to be wrinkled, and a space is easily formed between the insulating coating. For this reason, the insulation performance is likely to deteriorate. On the other hand, the insulating coating covering the outer portion of the outer peripheral portion scheduled to be bent of the flat conducting wire is likely to be broken due to elongation. According to the present invention, both the wrinkles and the dielectric breakdown can be effectively prevented by using two types of insulating coatings having the above-mentioned relationship between elongation and adhesion as the insulating coating. By using the first insulating film and the second insulating film as the insulating film, the insulating flat having an insulating film with excellent insulating characteristics can be prevented without depending on the material of the flat wire, and the film breakage and wrinkles of the insulating coating layer can be suppressed. Can provide conducting wire.

  According to the present invention, it is possible to provide an insulating rectangular conductor having an insulating film excellent in insulating characteristics by suppressing the coating damage and wrinkles (coating float) of the insulating coating at the bent portion without depending on the type of the rectangular conductor. Excellent effect.

The typical sectional view of the insulated rectangular conducting wire concerning an embodiment. The typical perspective view showing an example of the coil concerning an embodiment. FIG. 3 is a schematic top view taken along a dotted line III in FIG. 2. The figure which compared the elongation of the 1st insulating film and 2nd insulating film which concern on embodiment. The figure which compared the adhesiveness of the 1st insulating film and 2nd insulating film which concern on embodiment. Manufacturing process explanatory drawing of the insulation flat conducting wire which concerns on embodiment.

  Hereinafter, an example of an embodiment to which the present invention is applied will be described. Needless to say, other embodiments are also included in the scope of the present invention as long as they meet the spirit of the present invention.

  In FIG. 1, the typical perspective view of the insulated flat conducting wire which concerns on embodiment is shown. The insulated rectangular conducting wire 1 includes a rectangular conducting wire 10, a first insulating coating 11, and a second insulating coating 12.

  The flat conducting wire 10 is a conducting wire whose cut surface perpendicular to the longitudinal direction is rectangular. Here, “flat angle” is a general term for a flat shape in which the width w of the rectangular cross section is larger than the thickness t, and is not limited to a horizontally long rectangular shape having a right corner. For example, those having a rounded corner and those having a convex center at the side are included.

  The material of the flat conducting wire 10 is not particularly limited, and can be selected according to the application. For example, tough pitch copper and oxygen-free copper can be exemplified. The flat conductor 10 may be a single conductor or a collective conductor.

  The insulated flat conducting wire 1 is bent into a desired shape. Here, the bending process is a bending process for forming a product such as a coil from a rectangular conductive wire. Although the bending method is not particularly limited, an example of edgewise bending will be described here. FIG. 2 shows an example of a coil formed by subjecting the insulated flat wire 1 to edgewise processing.

  FIG. 3 shows a schematic top view of the encircled dotted line III in FIG. The first insulating coating 11 covers an outer region of the outer periphery of the flat conducting wire 10 that is scheduled to be bent, and the second insulating coating 11 covers an inner region of the outer periphery of the flat conducting wire 10 that is scheduled to be bent.

As the first insulating film 11 and the second insulating film 12, those satisfying the following conditions are used. That is, a material having adhesion satisfying the following condition (I) and elongation satisfying the following condition (II) is used.
Condition (I) First Insulating Film <Second Insulating Film Condition (II) First Insulating Film> Second Insulating Film

  FIG. 4 shows a graph comparing the elongation in the first insulating coating 11 and the second insulating coating 12, and FIG. 5 shows a graph comparing the adhesion (peel strength). The second insulating film 12 is made of a material having higher adhesion than the first insulating film 11. The difference in adhesion (peel strength) may vary depending on the type and shape of the rectangular conducting wire used, the bending angle, and the application, but the adhesion strength of the second insulating coating 12 compared to the first insulating coating 11 is 1.5. It is preferably about 5 times higher. Similarly, the elongation may vary depending on the intended use, but the first insulating film is preferably about 1.5 to 5 times higher than the second insulating film 12.

  The material of the insulating coating is not particularly limited as long as the above conditions are satisfied, but a material having a low dielectric constant and a thin film thickness is preferable. Preferable examples include fluororesin and polyphenylene sulfide (PPS) resin.

  Examples of the first insulating coating include a fluororesin, and examples of the second insulating coating 12 include a fluororesin in which an additive that increases adhesion strength to the fluororesin is mixed in an amount of, for example, about 1 to 10%. The first insulating film and the second insulating film may use the same type of resin to add an additive to bring out a desired characteristic, or use a different resin, or further add an additive to obtain a desired characteristic. You may make it pull out.

  In FIG. 5, an example of the manufacturing method of the insulated flat conducting wire of this invention is shown. The extrusion molding apparatus 3 includes a first extrusion molding machine 21, a second extrusion molding machine 22, a first screw 23, a second screw 24, a first supply port 25, a second supply port 26, a die body 27, a nipple 28, and a die. 29 etc.

  The extrusion molding apparatus 3 is an apparatus capable of simultaneously molding two kinds of materials with an extrusion molding machine having two screws. The resin 31 and the color material 33 are supplied from the first supply port 25, melted in the first extrusion molding machine 21, and further stirred by the rotation of the first screw 23 provided in the first extrusion molding machine 21. It is supplied to the die 29 via the pipeline. Similarly, the resin 32 is supplied from the second supply port 26, melted in the second extrusion molding machine 22, and further stirred by the rotation of the second screw 24 provided in the second extrusion molding machine 22. It is supplied to the die 29 via the pipeline.

  The flat conducting wire 10 is inserted into the die body 27 and conveyed at a predetermined speed from left to right in the drawing so as to pass through the nipple 28 and the die 29. The flat conductor 10 in FIG. 6 has a width w direction drawn on the upper surface of the paper, and the direction perpendicular to the paper and the direction of the thickness t of the flat conductor 10 match. The flat conductor 10 that has passed through the nipple 28 is covered with a die 29 with the molten material of the first insulating coating 11 and the molten material of the second insulating coating 12.

  The flat conducting wire 10 covered with the first insulating coating 11 and the second insulating coating 12 passes through the die 29 and is cooled and solidified in, for example, air or water. Through these steps, the insulating rectangular conductor 1 in which the rectangular conductor 10 is covered with the first insulating coating 11 and the second insulating coating 12 is formed.

  In the insulated rectangular conducting wire 1, it is preferable to mark the first insulating coating 11 and the second insulating coating 12 so that they can be easily distinguished from the appearance. For example, the color can be changed between the first insulating film 11 and the second insulating film 12, or one of the marks can be marked after the insulating film. Thereby, when bending, it can manage so that the inside and outside of a bending may not be mistaken by visual observation or image determination. In addition, according to such a method, there is an advantage that the thickness of the coating film can be reduced as compared with the case where coloring is applied after molding.

  According to the insulated rectangular conducting wire which concerns on this embodiment, a high space factor can be ensured by using the rectangular conducting wire whose cross section of a conducting wire is a rectangle. In addition, since the second insulating coating 12 having high adhesion strength is used on the inner side of the outer peripheral portion scheduled to be bent, the insulating coating is wrinkled (coating floating), and partial discharge occurs to prevent insulation. Can be effectively prevented. Further, since the first insulating coating 11 having excellent elongation is used for the outer portion of the outer peripheral portion scheduled to be bent, the coating tends to be stretched during bending, and pinholes and the like are hardly formed. As a result, it is possible to effectively prevent dielectric breakdown and deterioration of the withstand voltage characteristics. That is, it is possible to provide an insulating flat conductor having an insulating coating excellent in insulating characteristics by suppressing the coating damage and wrinkles of the insulating coating layer regardless of the material of the flat conducting wire 10.

  In addition, although the example using two types of insulating coatings was demonstrated, using three or more types of insulating coatings is not excluded. For example, in a wide insulated flat wire, a first insulating film is used in the outer region of the outer peripheral portion, a second insulating film is used in the inner region of the outer peripheral portion, and a third insulating film made of another material is used in the outer peripheral central region. It is also possible to use it. Moreover, in the above, although the example which shape | molds two types of resin materials simultaneously was described, you may perform each shaping | molding separately.

  The insulated rectangular conducting wire of the present invention is suitable for forming a coil such as a motor, but can also be suitably applied to other uses other than the coil.

DESCRIPTION OF SYMBOLS 1 Insulated flat conducting wire 2 Coil 3 Extrusion apparatus 10 Flat conducting wire 11 1st insulating coating 12 2nd insulating coating 21 1st extrusion molding machine 22 2nd extrusion molding machine 23 1st screw 24 2nd screw 25 1st supply port 26 1st 2 Supply port 27 Die body 28 Nipple 29 Die 31 Resin 32 Resin 33 Color material

Claims (1)

Insulating rectangular conducting wire comprising a flat conducting wire and an insulating coating covering the rectangular conducting wire, and having a predetermined bending plan,
The insulating coating is
A first insulating film covering an outer region of the outer periphery of the rectangular conducting wire to be bent;
A second insulating coating that covers an inner region of the rectangular conductive wire that is scheduled to be bent;
Adhesiveness satisfies the relationship of the first insulating coating <the second insulating coating,
Insulated rectangular conductor wire whose elongation satisfies the relationship of the first insulating film> the second insulating film.

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