JPS63195913A - Magnet wire and manufacture thereof - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a ribbon-shaped magnet wire used for small-sized high-frequency coils, etc., and a method for manufacturing the same.

[Background technology]

Conventionally, ribbon wires having an enamel coating are generally used in small high-frequency coils and the like for the purpose of increasing the space factor. When using an open magnetic path type core with a flange made of a magnetic material, there is a gap between the flange and the edge of the ribbon wire! @ Edge is bobbin! This is done with a white edge film or coating on the flange.

However, the ratio of thickness to width of the ribbon wire is limited to about 1:5, and if the ribbon wire is made flatter than this, the surface area of the enamel coating increases, and the space factor of the conductor decreases.

There are also ribbon wires made by pressing enamelled wires with a circular cross section, but in this case too, only the same level of flatness can be obtained.If the flatness is increased, there will be significant pin holes in the enamel coating at the edges of the ribbon wires. Crazing or peeling may occur.

In particular, in the case of small, thin coils with a coil winding width of several inches or less, there is a problem in that an effective winding width cannot be obtained due to the thickness of the bobbin and coating, and the inductance is limited to small coils. .

[Purpose of the invention]

An object of the present invention is to provide a magnet wire with excellent electrical properties and insulation properties, and a simple manufacturing method thereof.

[Disclosure of the invention]

The magnet wire of invention No. 9 includes a ribbon-shaped conductor;
An enamel coating that covers the entire circumference of the conductor, and a resin coating that is provided on the outer surface of the enamel coating with coating parts at both ends of the conductor in the width direction thicker than other coating parts, or only at both ends in the width direction. It is equipped with the following.

Each manufacturing method of the present invention is a method of manufacturing the magnet wire.

The invention of the first manufacturing method is a method of forming a ribbon-shaped magnet wire by pressing a magnet wire material having a circular cross section and having an enamel coating around the entire circumference of the conductor.

A second manufacturing method invention is a method in which an enameled wire and a resin film are stacked and pressed, thereby flattening the enameled wire into a ribbon shape and embedding it in the resin film to obtain a ribbon-shaped magnet wire. It is.

The invention of the third manufacturing method is such that resin wires are arranged along both sides of the enameled wire, and the enameled wire and the resin wire are simultaneously pressed in a side-by-side state with respect to the pressing direction. In this method, the magnet wires are flattened and integrated into ribbon-shaped magnet wires.

According to the structure of the magnet wire of the present invention, both ends in the width direction of the conductor are covered with an enamel coating and a resin coating, so that the insulation properties at both ends in the width direction are excellent. Therefore, for example, even if the flange part is wound around a core made of magnetic material, there is no need to apply a bobbin or coating to the core.In addition, the resin coating is made thicker at both ends in the width direction than the other coating parts. Alternatively, since the resin coating is provided only at both ends, the proportion of the conductor in the coil winding does not become too small due to the resin coating.Therefore, it is possible to obtain a small and high impedance coil.

According to each manufacturing method of the present invention, the magnet wire having the above structure can be manufactured easily and efficiently.

Example Embodiments of the invention will be described based on the drawings.

FIG. 1(A) shows a magnet wire 1 obtained by the invention of the first manufacturing method. 3, and a resin coating 4 provided on the outer surface of the enamel coating 3 so that the coating portions 4a at both widthwise ends of the conductor 2 are more closely spaced than the other coating portions 4b.

This magnet wire 1 is made of a magnet wire material 1' having a circular cross section, which has an enamel coating 3' and a resin coating 4' around the entire circumference of a conductor 2' shown in FIG. 1(B). It is obtained by pressing continuously between

By this pressing, the resin coating 4 is coated at both ends of the coating portions 4a.
is thicker than the other covered portions 4b.

The magnet wire material 1' is obtained by forming a resin coating 4' on the enameled wire 5 by extrusion molding or the like and photocuring the resin coating 4'. The thickness of the resin coating 4' is preferably sufficiently larger than the thickness of the enamel coating 3'.
As the material, flexible resin such as polyethylene is used. When magnetic powder such as ferrite powder is mixed into the resin coating 4', the Q value of the coil is improved.

The material for the enamel coating 3' is oil-based enamel or polymer. Polyurethane, polyurethane nylon, polyesterimide, polyamideimide.

Polyimide etc. can be used. It may also be fusible.

In the above-mentioned press, pinholes occur in the enamel coating 3 when the width to thickness ratio is 3:1 or more in the cold state;
1 causes crazing or cranking. 5 when pressed
When heated to 0 to 100° C., the generation of pinholes is halved.6 When the ratio of width B to thickness C is B/C>2, almost no pinholes occur on the B side of the enamel coating 3.

FIG. 2 shows an example of a high-frequency coil using this magnet wire 1. The core 6 is a main leg 6a with magnetic flanges 6b integrally formed at both ends, and an insulating film 7 wrapped around the core 6. Wrap the magnet wire l around it. The gap L between the flanges 6b is 10w or less.

According to the magnet wire with this configuration, both ends of the conductor 2 in the width direction are covered with an enamel coating 3 and a resin coating 4 for 2! Since it is covered with , it has excellent insulation at both ends in the width direction. Therefore, even when the flange portion 6b is wound around the core 6 made of a magnetic material as shown in FIG. Therefore, it is only necessary to insulate the beginning and end of the winding, which is particularly effective when the winding slit (gap) is narrow and deep in the core 6. In the case of direct winding without using a wire or the like, it is desirable that the thickness A of the covering portion 4a be 3 mm or more.

In addition, since the resin coating 4 has the other coating parts 4b thinner than the coating parts 4a at both ends in the width direction, the resin coating 4 prevents the proportion of the conductor 2 in the coil winding from becoming too small. Therefore, a small and high impedance coil can be obtained.

When the magnet wire 1 of this example was manufactured under the following conditions, no abnormality was found after a proof stress test at 1500 VAC for 1 minute. For the enamel 1I15 of the magnet wire material 1', a 2UEW (2nd class polyurethane wire according to JIS standard C3053) with a diameter of 0.6 is used, and polyethylene resin is extruded onto this to form a resin coating 4' with a thickness of 0.5 m. get.

This magnet wire material 1' was heated and pressed into a ribbon shape with a width of 2.3 mm and a thickness of 0.2 fi. Conductor 2
The thickness of the enamel covering 1113 in the thickness direction is 3 Llml
-i The thickness of the resin coating 4 is Sum, and the thickness A of the resin coating 4 in the width direction is 0.7.

FIG. 3(A) shows the magnet wire 11 obtained by the invention of the second manufacturing method.
), by stacking the enameled wire 5 and the resin film 14' and pressing them with a press roll, the enameled wire 5 is flattened into a ribbon shape, and the resin film 1
4'. In this case, the conductor 2 is
Both ends in the width direction and one side in the thickness direction are covered with covering portions 14a and 14b of a resin coating 14 made of a resin film 14'. The magnet wire 11 of this example obtained under the following conditions also passed the same voltage resistance test as described above. That is, the same 0.6φ2t JEW (second class polyurethane wire) as above was used for the enameled wire 5, and the wire width was 180u.
*Layered with a 14″ thick polyester resin film and roll pressed.

The thickness of the covering portion 14b of the pressing part was 10 u-, and the pinholes formed in the enamel covering 1113 were covered with the resin coating 14. Overall width is 2.6mm, thickness is 0.2w
It is a.

FIG. 4(A) shows a magnet wire 21 obtained by the method of the first embodiment in the invention of the third manufacturing method. Resin wires 24' are arranged along both sides of the enameled wire 5 and the resin wires 24' are simultaneously pressed so as to be side by side with respect to the pressing direction (direction of arrow P).

As a result, the enameled wire 5 and the resin wire 24' are flattened and integrated into a ribbon shape. The resin wire 24' becomes a resin coating 24 formed only on both ends of the conductor 2. For example, the enameled wire 5 is 0.6φ2
Using UBW (second class polyurethane wire), resin wire 2
4' is made of polyamide with a diameter of 0.4. These are fused and integrated using a hot press. The enameled wire 5 may be a so-called self-fusing wire in which the enameled coating 11913' is a fusing layer. Examples of the fusing component include polyvinyl butyral, epoxy, and polyester.

FIG. 5(A) shows a magnet wire 31 obtained by the method of the second embodiment in the invention of the third manufacturing method. In this case, two enameled wires 5 are arranged side by side between the resin wires 24', For example, enameled wire 5 is 0.4φ2
tJEW is used, and the width after pressurization is 2.5 m and the thickness is 25 mm.

In the example of FIG. 4, the ratio of the width and thickness of the enamel 11121 after pressurization is about 10 times, and pinholes, cranks, etc. are likely to occur in the enamel M'f43.However, in the example of FIG. The ratio is lowered by 2 to 5 times. Therefore,
The number of pinholes generated can be approximately A in the example of FIG.

〔Effect of the invention〕

According to the magnet wire of the present invention, since both ends of the conductor in the width direction are covered with an enamel coating and a resin coating, the insulation properties at both ends of the conductor in the width direction are excellent. Therefore, for example, even if the flange part is wound around a core made of magnetic material, there is no need to apply a bobbin or coating to the core.In addition, the resin coating is made thicker at both ends in the width direction than the other coating parts. Alternatively, since the resin coating is provided only at both ends, the proportion of the conductor in the coil winding does not become too small due to the resin coating.Therefore, it is possible to obtain a small and high impedance coil.

Further, according to the manufacturing method of the present invention, there is an effect that the magnet wire can be easily and favorably manufactured.

[Brief explanation of the drawing]

Figures 1 (A) and (B) are the first images of this invention.
Figure 2 is a partial cross-sectional view of a coil using the magnet wire, Figure 3 (A), (
B) is a cross-sectional view of the magnet wire obtained by the invention of the second manufacturing method and its manufacturing process, and FIG. 4 (A>, (
B) is a cross-sectional view of the magnet wire obtained by the invention of the third manufacturing method and its manufacturing process, and FIG. 5 is (A),
(B) is a cross-sectional view of the magnet wire obtained in the second embodiment of the invention of the third manufacturing method and the manufacturing process thereof. DESCRIPTION OF SYMBOLS 1... Magnet wire, 1'... Magnet wire material, 2... Conductor, 3... Enamel coating, 4...
... Resin coating, 4a, 4b... Covered part, 5 Enameled wire, 11.21.31... Magnet wire (A>
(B) Figure 4 (A) (B) Figure 5 %5rPIN-1 Procedural Amendment (filed on November 26, 1988, 1988 Patent Application No. 026588 2, Title of Invention Magnet Wire and Manufacturing method 3, relationship with the person making the amendment, Hanyu Applicant 4, agent 5, date of amendment order Voluntary amendment (1) In the 6th true line 20 of the specification, "Horimar" was replaced with "Formal". (2) On page 8, line 4 of the specification, the phrase "beginning of volume" is corrected to "beginning of volume."

Claims (5)

[Claims] (1) A ribbon-shaped conductor, an enamel coating that covers the entire circumference of the conductor, and a coated portion at both ends of the conductor in the width direction on the outer surface of the enamel coating is made thicker or wider than other coated portions. Magnet wire with resin coating provided only on both ends. (2) A method for manufacturing a magnet wire, in which a ribbon-shaped magnet wire is obtained by pressing a magnet wire material with a circular cross section that has an enamel coating and a resin coating around the entire circumference of the conductor. (3) A method for producing a magnet wire by stacking and pressing an enameled wire and a resin film to flatten the enameled wire into a ribbon shape and embedding it in the resin film to obtain a ribbon-like magnet wire. (4) Place resin wires along both sides of the enameled wire,
A method for manufacturing a magnet wire, in which the enameled wire and the resin wire are simultaneously pressed side by side in a pressing direction to flatten and integrate the enameled wire and the resin wire into a ribbon-shaped magnet wire. (5) The method for manufacturing a magnet wire according to claim (4), wherein a plurality of the enameled wires are arranged between both the resin wires.