JPH06231938A - Lamination coil - Google Patents

Abstract

PURPOSE:To provide a lamination coil having good producibility which does not damage electrical insulation between conductor layers even if burr is generated in an edge face of a material in a lamination coil used for a wide variety of electrical equipment. CONSTITUTION:Metallic foils 3 and 7 slit to a fine width are used for a conductor layer, a plastic film 5 is used for an insulation layer and two or more conductors are wound simultaneously deviated in a width direction of the conductor by 10mum or more and within 50mum. Thereby, a lamination coil can be acquired which does not damage electrical insulation between conductor layers of a coil even if a burr 8 is generated in an edge face of a material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated coil used in electric equipment such as motors and transformers.

[0002]

2. Description of the Related Art In recent years, as a coil of this type, a so-called record winding is used which is formed by laminating a rolled copper foil with a plastic film such as polyimide and then slitting a narrow wire (hereinafter referred to as a ribbon). ing.

A conventional laminated coil will be described below. FIG. 3 (a) is a schematic cross-sectional view showing a cross-sectional structure of a ribbon used in a conventional laminated coil, and FIGS. 3 (b) to 3 (c) are cross-sectional structures of a laminated coil obtained by winding the ribbon. FIG. 3A to 3C, 9 is a metal foil, 10 is an adhesive, and 11
Is a plastic film, and 12 is a burr generated at the time of slitting.

The structure of the laminated coil constructed as described above will be described below. First, FIG. 3 (a)
A ribbon obtained by laminating a plastic film 11 with an adhesive 10 is wound around the metal foil 9 shown in FIG. 3 in a so-called record winding to obtain a laminated coil whose cross section is shown in FIG. The structure of the laminated coil thus obtained has a metal foil 9
Is used as the conductor layer, and the adhesive 10 and the plastic film 11 are used as the insulating layer.

[0005]

However, in the above-mentioned conventional structure, as shown in FIG. 3 (c), the burr 12 generated at the time of slitting and the metal foil 9 come into contact with each other at the coil end surface, and an electrical short circuit occurs between the conductor layers. However, there is a problem that is likely to occur.

The present invention solves the above problems, and provides a laminated coil having excellent productivity without damaging the electrical insulation between the conductor layers of the coil even if burrs are generated on the ribbon end face. The purpose is to do.

[0007]

In order to achieve this object, the laminated coil of the present invention uses a metal foil having narrow slits in the conductor layer, and a plastic film in the insulating layer, and two coils. 10 μm of the above conductor in the width direction of the conductor
As described above, they are wound at the same time while being displaced within 50 μm.

[0008]

With this structure, the position of the burr generated on the ribbon is displaced in the width direction at the coil end face, so that the occurrence of an electrical short circuit between the coil conductor layers caused by the overlapping of the burr is suppressed. be able to.

[0009]

【Example】

(Embodiment 1) An embodiment of the present invention will be described below with reference to the drawings.

1 (a) and 1 (b) are schematic sectional views showing a sectional structure of a ribbon which is a material of a laminated coil using the present invention, and FIGS. 2 (a) and 2 (c) are the above-mentioned. It is a cross-sectional schematic diagram which shows the cross-section of the laminated coil obtained by winding a ribbon. 1 (a) to 2 (c), 1 is a ribbon formed by slitting a metal foil, and 2 is a ribbon formed by slitting a metal foil and then adding an insulating layer. 3 is a metal foil of the ribbon 2, 4 is an adhesive, 5 is a plastic film, and 6 is a burr of the metal foil 3 generated when the ribbon 2 is slit.
Reference numeral 7 is a metal foil of the ribbon 1, and 8 is a burr of the metal foil 7 generated when the ribbon 1 is slit.

The structure of the laminated coil constructed as described above will be described below. As shown in FIG. 1A, the ribbon 1 is a ribbon obtained by slitting a metal foil 7 in a narrow width, and has a burr 8 generated at the time of slitting. Figure 1
As shown in (b), the ribbon 2 is a ribbon which is obtained by laminating a plastic film 5 on a metal foil 3 with an adhesive 4 and then slitting into a narrow width, and having a burr 6 generated at the time of slitting. . In the experiment, a rolled copper foil having a thickness of 18 μm was used for the metal foil 3, and 1.2 was used for the plastic film 5.
A PEN (polyethylene naphthalate) film having a thickness of μm was used. Each was laminated with an adhesive 4 having a thickness of 0.8 μm and then slit into a width of 0.9 mm, which was used as the ribbon 2.

The metal foil 7 has the same thickness 1 as the ribbon 2.
Using a rolled copper foil of 8 μm, the ribbon 1 was slit into a width of 0.9 μm. Of course, vapor deposition for ribbon 2
It is also possible to use a method of forming a metal layer on the plastic film 5 without using an adhesive by either sputtering or plating, or a combination thereof.

When the metal foil 3 or the metal foil 7 was slit, burrs 6 and burrs 8 of about 4 to 5 μm were formed. However, in the laminated coil in which the ribbon 2 is displaced from the ribbon 1 in the width direction of each ribbon by 10 to 50 μm and wound at the same time, as shown in FIG. 2B, the burrs 8 and the plastic film 5 are formed on one end surface of the coil. The insulating layer made of the adhesive 4 bends outside or inside the coil so as not to contact the metal foil 3. In addition, FIG.
As shown in FIG. 5, the burrs 8 formed on the metal foil 3 and the metal foil 7 on the other end face are not in contact with each other because they have a distance of 10 to 50 μm.

[0014]

As described above, in the laminated coil of the present invention, the conductor layer uses the metal foil having a narrow slit, the insulating layer uses the plastic film, and the two or more conductors have a width of 10 μm. Even if burrs are generated on the end face of the ribbon by winding the wire while shifting it by a distance of 50 μm or more,
A laminated coil having excellent productivity can be realized without impairing the electrical insulation between the conductor layers of the coil.

[Brief description of drawings]

FIG. 1A is a schematic sectional view showing the structure of a ribbon of a laminated coil in one embodiment of the present invention. FIG. 1B is a schematic sectional view showing the structure of the ribbon.

FIG. 2 is a schematic sectional view showing the structure of a laminated coil according to an embodiment of the present invention.

FIG. 3A is a schematic sectional view showing the structure of a conventional ribbon. FIG. 3B is a schematic sectional view showing the structure of a conventional laminated coil.

[Explanation of symbols]

 3,7 Metal foil 5 Plastic film

Claims (3)

[Claims] 1. A laminated coil in which a metal foil having a narrow slit is used for a conductor layer and a plastic film is used for an insulating layer, and two or more conductors are wound at the same time. 2. The laminated coil according to claim 1, wherein the simultaneously wound conductors are wound while being displaced in the width direction of the conductors. 3. The laminated coil according to claim 2, wherein the conductors wound at the same time are displaced in the width direction of the conductors by a distance of 10 μm or more and 50 μm or less.