JPS5846790B2 - How to make a flat coil - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a flat coil formed by winding a conducting wire in a planar shape.

To drive the magnetic bubble element, a rotating magnetic field that is parallel to the surface of the magnetic thin film for magnetic bubbles is applied, and the method for creating this rotating magnetic field is to use flat coils arranged in an intersecting manner.
The applicant has proposed a system in which the coil generates oscillating magnetic fields in the X and Y directions, and a rotating magnetic field is obtained by combining them.

There are two ways to arrange these flat coils: one is to stack each pair of X-direction coils and Y-direction coils on top of the other with a space between them, and the other is to arrange them horizontally on the same plane.In this latter method, adjacent coils It is desirable that the periphery of the coil be linear and that the linear range be long so that the coils are in close contact with each other and the area is wide so that a large space for arranging the magnetic bubble element can be secured.

However, in the conventional coil manufacturing method, the periphery of the coil is rounded, and it is difficult to form a long straight portion even if the coil is formed by pressing or the like.

The present invention proposes a coil manufacturing method that improves the problem of curling and allows the straight portion to be made longer.

The present invention relates to a method for creating a flat coil which is formed by winding a conducting wire in a flat shape and is arranged in parallel with a mating coil on the same plane with the side edges still in contact with each other. The method is characterized in that a jig is used as a winding core, and the conductor wire is wound around the core while being pressed on both sides by presser plates.
Next, this will be explained in detail with reference to the drawings.

Figure 1 shows the outline of the magnetic bubble device drive section, la, 1
For example, b is a pair of flat coils for generating a magnetic field in the X direction, which are arranged on the same plane and in close contact with each other on the outer periphery.
For example, a current of 11°12 is passed in the direction shown to generate an X-direction magnetic field.

lc. 1d is a flat coil arranged in the same way,
Coil pairs 1a and ib are arranged in parallel with a space between them,
Current i3. i4 is energized to generate a Y-direction magnetic field.

The magnetic bubble elements ■ to ■ are arranged between these coil pairs 1a, 1b and 1c, 1d, and the magnetic field strength is a predetermined value (
For example, it is arranged in an area where the distribution is uniform and the number is 300e) or more.

In such a type of magnetic bubble device, the driving magnetic field must have a uniform strength, for example, 3% or less during fluctuations, so the coil pairs 1a and 1b, and 1c and 1d must be closely juxtaposed. In order to achieve this, it is desirable that the contact surface, that is, the outer circumference of the coil, be linear and as long as possible.

However, conventional flat coils have rounded outer circumferences, making it difficult to obtain long straight distances.

In other words, Fig. 2 is a diagram explaining the conventional coil manufacturing method, and as shown in this figure, conventionally the long side length IL was 25 m.
A flat coil 1 was manufactured by using a spacer jig 2 with a long and thin rectangular cross section in which the short side length 1 □ is 2 studs, and an insulated conductor 3 with a diameter of about 0.35 mm is wound around it. .

However, with this method, the entire shape becomes an ellipse, and the periphery 1f becomes rounded.

Needless to say, such an elliptical flat coil has poor adhesion, and the resulting magnetic field has an uneven intensity distribution.

FIG. 3 shows the method of the invention.

As shown in this figure, in the present invention, both corners of the spacer jig 4 serving as the winding core are cut off to form a trapezoid with a low height.

To give an example of dimensions, the length of the lower base 4a is 25 mm, the length of the upper base 4b is 15 mm, and the height 4c is 2 mm.

An insulated conductive wire 3 is wound around a round core 4 to form a flat coil with a width 5a of about 8 mm.

In order to hold down both sides of the coil, a pair of parallel holding plates 6a and 6b are provided on the left and right sides of the winding core 4, as shown in FIG.
A winding frame consisting of these members 4°6a, 6b is set in a winding machine, and the winding frame is rotated around the center line of the winding core 4,
The conducting wire 3 is wound around the winding core 4 and between the holding plates 6a and sb.

As the insulated conductive wire 3, a solid wire or a twisted wire is used.

According to such a winding method, the obtained flat coil 5
has the shape shown in FIG. 3, and the peripheral straight portion 5b is longer.

This is thought to be due to the fact that the conducting wire 3 is bent sharply at the acute angle portions 4e and 4f of the winding core 4.

Moreover, since the winding core 4 has a shape in which both corners of the winding core 20 in FIG. 2 are cut off, the relationship between one side of the triangle and the phases on the other two sides holds true, and the winding length is shorter than in the case of FIG. 2.

After winding is completed, at least one of the holding plates 6a and 6b is removed, the winding core 4 is pulled out, and the coil 5 is taken out.

The material of the winding core 4 is preferably phosphor bronze, and in order to achieve dimensional accuracy, the winding core 4 is not wrapped with insulating paper or the like, but the conducting wire 3 is directly wound thereon.

FIG. 5 shows an outline of a driving section of a magnetic bubble device using a flat coil manufactured according to the present invention.

Since each of these flat coils 5a to 5d is shaped like a disk divided into two, the space factor when they are butted together is good.

As described in detail above, according to the present invention, a long flat coil with a good peripheral linearity ratio can be obtained, and when configuring a coil for generating a magnetic field for driving a magnetic bubble, it is possible to control dimensions and improve magnetic field quality. A wide range of improvements can be made.

Furthermore, since the winding length can be shortened, it is also possible to reduce DC resistance and inductance.

Of course, the flat coil manufactured according to the present invention can be used not only for driving magnetic bubbles, but also for driving other suitable devices.

[Brief explanation of the drawing]

Figures 1 and 2 are a schematic perspective view of the drive section of a magnetic bubble device using a conventional flat coil, and a plan view illustrating the coil winding method, and Figures 3, 4, and 5 are A plan view and a perspective view of a winding frame portion for explaining the method of creating a coil according to the invention,
FIG. 3 is a schematic perspective view of the drive section of the magnetic bubble device. In the drawing, 3 is a conductor, 4 is a spacer jig, and 5a. Reference numeral 6b indicates a holding plate, ① to ① magnetic bubble elements, and 5 a flat coil.

Claims (1)

[Claims] 1. A method for producing a flat coil, which is formed by winding a conducting wire in a flat shape and is arranged in parallel with the other coil on the same plane with the side edges in contact with each other, the cross section being low in height. A method for making a flat coil, characterized in that a trapezoidal spacer jig is used as a winding core, and a conducting wire is wound around the winding core while holding both sides with presser plates. 2. Claims characterized in that the flat coil is a coil for driving a magnetic bubble element, and the winding core is a trapezoidal phosphor bronze piece with a ratio of 15 on the upper base, 25 on the lower base, and 3 in height. The method for producing a flat coil as described in item 1.