JPS5941157A - Manufacture of coil for small-sized motor - Google Patents

Abstract

PURPOSE:To obtain a product which has high winding density and high reliability with a simple work by partitioning in advance many coil patterns on an insulating sheet, and folding the patterns in each partition in wavy shape. CONSTITUTION:A coil pattern 2 which corresponds to the coil which generates a magnetic field is partitioned and formed on both front and back surfaces of an insulating sheet 1. The pattern 2 is conducted between the front and the back surfaces at the central part of the spiral turn of the coil, and the outer periphery of the pattern 2 is connected by a connecting part at every other partition. The sheet 1 which is thus formed with the pattern 2 is folded in wavy shape at every partition, thereby forming a coil for a small-sized motor.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a coil for a small motor, in particular, by forming a coil pattern in a regulated manner on both the front and back sides of a single insulating sheet, and then applying an insulating layer to the insulating sheet. The present invention relates to a method of manufacturing a coil that is folded and integrated through a coil.

As printed wiring technology improves, it has been proposed to manufacture coils for small motors using this printed wiring technology. That is, a coil for generating a magnetic field is manufactured as a printed pattern, and a large number of these patterns are laminated to form a coil. The idea is to easily mass-produce very small coils with high winding density using printed wiring technology, without requiring the troublesome work of winding metal wire around a core.

As an example of the manufacturing method of such a coil for a small motor, there is a
This was disclosed in the procedural amendment filed on April 14th. In this technology, two insulating thin films are stacked and adhered to each other with an adhesive to form an insulating sheet, and a plurality of first coils of approximately the same shape are arranged in a line on one side of the insulating sheet. A second coil is formed on the other surface of the insulating sheet, facing each of the first coils, having substantially the same shape and facing oppositely to the first coil when viewed from the same direction. The center ends of the second coils facing each other are connected to each other through holes formed in the insulating sheet, and the outer ends of the first coil and the outer end of the adjacent second coil are connected to each other through the hole formed in the insulating sheet. This is a coil for a small motor that is connected sequentially through the coils.

However, according to this conventional technology, a spiral coil pattern is formed only on one side of each of two insulating sheets, and these are overlapped with adhesive to form a coil, and the overlapping operation is not required. It is not possible to perform the coil patterns continuously and smoothly, and it is troublesome to align the coil patterns with each other. Further, since the wiring terminals of each insulating sheet must be connected to each other separately, manufacturing is difficult, especially when the insulating sheet is multilayered to generate a strong magnetic field.

The present invention was made in view of the above-mentioned problems, and provides an advanced method for manufacturing a coil for a small motor.The purpose of the present invention is to manufacture a small morph coil with high winding density through a few simple work steps. Our goal is to manufacture and obtain highly reliable products.

In order to achieve this, the present invention divides coil patterns on both the front and back sides of a single insulating sheet into a plurality of sections having the same width so that the coil patterns have the same winding direction when viewed from each surface and are connected to each other in a series. This insulating sheet is formed in advance and folded into a wave shape with an insulating layer interposed therebetween to integrate the insulating sheet.

Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a plan view for explaining the method of manufacturing a coil for a small motor according to the present invention, and FIG. 2 is a back view of the same.
1) indicates a foldable insulating sheet. Suitable materials for this insulating sheet (1) include polyester resin film, epoxy resin film, polyimide resin film, and the like. Both the front and back sides of such a long insulating sheet (1) are temporarily divided into a plurality of medical books having approximately the same width. The symbols ``■'' to ``■'' in parentheses in FIGS. 1 and 2 indicate the medical book number.

Of course, an appropriate number of such medical books may be used, and needless to say, the arrangement order of the medical book numbers is reversed on both the front and back sides.

A coil pattern (2) corresponding to a winding that generates a magnetic field is formed on both the front and back surfaces of such an insulating sheet (1). The coil pattern (2) can be formed using ordinary printed wiring technology, transfer method, or additive method.
), a fully bent conductor such as copper is wired as a coil pattern (2).

To explain the drawing form of coil pattern (2),
The coil pattern (2) has the same winding direction when viewed from each of the front and back surfaces, and the winding directions of adjacent medical books are opposite3. The front and back surfaces are electrically connected to each other at the center of the spiral. This is achieved, for example, by through-hole plating. In addition, the outer circumferential portion of the coil pattern (2) is connected to each other by the connecting portion (31) every other medical book, and in this way, the coil pattern (2) on both the front and back sides (
2) is made conductive at its center by through-hole plating, etc., and the outer periphery is connected every other section by the connection part (3), so that all the coil patterns (2) on both the front and back sides are connected in series. The terminals (4) at both ends of the long insulating sheet (1) are now electrically conductive.
), all coil patterns (2) are energized.

The manufacturing of such a coil pattern (2) is done by printing or transferring a conductive metal onto an insulating sheet, as described above, but the number of turns of the coil can be changed as desired. Moreover, the line width can be made thinner and the line density can be increased.

Furthermore, in the illustrated example, only a single coil pattern (2) is drawn on the same medical book, but a plurality of coil patterns (2) are drawn at opposing positions on both the front and back sides of the same medical book.
2) in a ring (for example, four patterns are arranged in a ring).

) or in parallel is also possible, in which case a plurality of coils would be manufactured in one piece as will be described later.

What should be noted in this regard is that the coil pattern (2), which can be freely designed into almost any shape, can be produced very easily by a known printing method.
And a large number of coil make (2), terminal part (4
) is required only at both ends of the insulating sheet (1).

The insulating sheet (1) on which the coil pattern (2) is formed is placed in a
Fold it into the wave shape shown in the diagram.

Of course, simply folding the coil pattern (2
) will be short-circuited, so while the insulating sheet (1) is flat, insulate N(
5) is formed on the coil pattern f2+. Formation of such an insulating layer (5) can be realized using substantially the same process and simplicity as a printing method or the like. Of course, if the insulating layer (5) is present in front of the folded portion, it will not be possible to fold it, so the insulating layer (5) is not provided in this portion.

Then, as shown in the perspective view of FIG. 4 and the cross-sectional view of FIG. Combine and integrate. Of course, as a method of integration, the insulating sheet (1) folded into a wave shape may be resin molded with the insulating layer (5) interposed therebetween, so that only the terminal portion (4) is exposed. As a result, the coil shown in FIG. 4 is formed.

When folding the insulating sheet (1) into a wave shape, there is a connecting part (31) between adjacent medical books, so there are two ways to make this connecting part (3) a folding peak and a valley. When folding, physical force is applied to the pattern, which is a metal conductor, so in order to deal with this, as shown in Fig. In preparation for disconnection of the wire, it is recommended to apply a conductive resin (7) to this rounded part.By doing this, due to the presence of the insulating layer (5), the connection part Coupled with the fact that (3) is folded into a round shape, electrical continuity at the folded 0 portion is ensured.

According to the manufacturing method of the present invention, a large number of coil patterns (2) are formed in advance on an insulating sheet as a medical book, and these are folded into a wave shape for each medical book. The folding operation when completing the coil shown in the figure can be performed continuously and smoothly, and the mutual center positioning of the coil patterns (2) for each section can be performed extremely easily. Further, since the coil patterns (2) of each medical book are connected to each other by the wiring patterns themselves, the terminal portions of the coils are prepared on the upper and lower surfaces of the coils without the need for any post-processing. Therefore, it is easy to strengthen the magnetic field by forming the coil pattern (2) into multiple layers.

[Brief explanation of the drawing]

FIG. 1 is a plan view for explaining the manufacturing method of a coil for a small motor according to the present invention, FIG. 2 is a rear view of the same, FIG. The figure is a perspective view when completed, and FIG. 5 is a sectional view of the same. 1... Insulating sheet 2... - Coil pattern 3... Connection part 4... 0 Terminal part 5... Insulating layer 6... Adhesive layer 7... Conductive resin layer 1 Figure 2 jl! Figure 3 Figure 4 Figure 5

Claims (1)

[Scope of Claims] Coil patterns with the same winding direction as viewed from each surface are placed on both sides of a long insulating sheet having a plurality of medical sheets having approximately the same width of 1°. The coil patterns on both the front and back sides of the same section are electrically connected at the center of the coil pattern, and the coil patterns of adjacent medical books are connected every other section at the outer periphery. Connect them so that all the coil patterns on both sides are connected in series.
A method of manufacturing a coil for a small motor by folding each medical book into a wave shape with an insulating layer interposed and integrating the folded sheets. 2. The coil 3 for a small motor according to claim 1, characterized in that the connecting portion with the coil pattern of the adjacent medical book is a folded pile, and the connection with the adjacent coil pattern of the Ku Feng. A method for manufacturing a coil for a small motor according to item 1 of the scope of special WFM requirements, characterized in that the portion is a folded valley. 4. A method for manufacturing a coil for a small motor as set forth in claim 1, characterized in that a plurality of coil patterns are formed at opposing positions on both the front and back surfaces of the insulating sheet within the same division.