JPS6037754Y2 - magnetic bubble drive coil - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic pap drive coil that generates a rotating magnetic field for driving a valve.

As is known, magnetic valves are generally driven by rotating magnetic fields created by X and Y coils.For this purpose, a bubble chip is inserted into the X and Y coils arranged orthogonally, and a 90' Alternating current with different phases is passed, but in this case there are problems such as the law.

In other words, the strength of the magnetic field H generated by a coil is generally not uniform in the axial direction of the coil, and as shown in FIG.
It is strongest at the center 1a of the coil and weakest at both ends 1b and lc of the coil.

It is preferable that the rotating magnetic field acting on the magnetic baffle chip be as uniform as possible, for example within a range of about ±3%. If the strength of the coil changes in the axial direction of the coil, the usable range is extremely small, and the coil inevitably becomes larger.

On the other hand, in a magnetic bubble device such as a bubble memory, the coil excitation current is set to a high frequency in order to increase the bubble transfer rate and increase the write/read speed. This has the disadvantage that the voltage becomes considerably high.

Therefore, it is necessary to make the coil as small as possible to a sufficient extent to accommodate the bubble chip, and to suppress an increase in inductance.

The present invention was made in view of the above points, and aims to provide a magnetic bubble drive coil that can generate a magnetic field of uniform strength S over the entire length of the coil, and can therefore be manufactured in a small size. It is something to do.

This will be explained in detail below with reference to Examples.

FIG. 2a shows an outline of the magnetic bubble drive coil according to the present invention.

This coil 2 is bubble-wound (multilayer segmental winding), and 2a, 2b, . . . , 21 are blocks thereof.

In other words, in block 2a, after winding the lowest layer winding 2a1, the next middle layer winding 2a2 is wound, and then the top layer winding 2a2 is wound.
Winding a3, then lowermost winding 2 of the next block 2b.
b, then the upper layer winding 2b2, and then the lower layer winding 2C□ of the next block 2c.

The same applies below. The central coil block 2e is a single layer winding of only the lower layer winding, and the coil blocks 2a, 2 at both ends are
i is a three-layer winding consisting of lower, middle, and upper layer windings, and the rest are two-layer windings consisting of lower and upper layer windings.

In this way, the magnetic field at the center of the coil is weakened, and conversely, the magnetic field is strengthened at both ends of the coil, as shown in Figure 2. A magnetic field H that is considerably flattened compared to that obtained is obtained.

In such a magnetic field, the entire length of S can be used, so the coil can be kept to a size larger than that of a bubble chip, and the coil can be shortened and the inductance can be reduced.

Since the 81% bubble drive coil does not have a bobbin to reduce inductance, pitch winding cannot be performed with such a coil, but by combining it with bank winding, pitch winding becomes possible and the high quality magnetic field shown in the figure can be obtained. It will be done.

Bank winding is also effective in reducing the distributed capacity (for example, the distributed capacity is about one order of magnitude smaller than in the case of loose winding).
, which is advantageous for high frequency driving.

The method of winding is to use heat-sealed wire (cement wire) as the winding wire, and while passing the winding wire through alcohol or trichlorene, the winding distribution as shown in FIG. Wind it up as you like.

As the windings are wound, they are fused together, thus providing a bobbinless solenoid coil with a rectangular cross section.

FIG. 3 shows a specific example, and FIG. 4 shows its characteristics.

As shown in FIG. 3, this coil 3 is composed of first to twelfth blocks 3a, 3b, . . . 31, and each block is composed of the following windings.

3a...1~113e...40~503180~9
03b...12~213f...51~593j...
・91~1003c...22~313g...60~
703k...101~1103d...32~393
h...71 to 7931...111 to 120 The block at the end of the coil consists of two layers of winding, and the first, that is, the lower layer winding advances toward the right in the drawing, and after a predetermined number of turns, the upper layer winding advances. Move and wind to the left of the drawing.

The upper layer winding is wound between the lower layer windings.

In this way, compared to the method of simply winding the first lower layer from one end of the coil to the other end, folding it back at the other end, and winding the second upper layer from the other end to one end, the gap between the upper and lower windings is The potential difference becomes smaller, the distributed capacitance becomes smaller, and the high frequency loss becomes smaller.

When the winding of one block is completed, the process advances to the next block. At this time, the windings are wound diagonally as shown in 4a, 4b, etc., but in the case of bank winding, the windings are wound diagonally on the upper and lower surfaces of the rectangular cross-section solenoid coil. (The bubble chip is placed parallel to this plane)
Since each winding must be perpendicular to the coil axis (direction perpendicular to the plane of the paper in FIG. 3), the diagonal windings are placed on the sides of the coil.

In this coil, the upper layer winding is omitted from block 3e in the center.
31 and the block 3et 3L 3at in the center to obtain as flat a magnetic field distribution as possible.
3ht31 is 3. 1. 3. 1. It is removed for only 3 turns.

As a result, as is clear from FIG. 4, an extremely flat magnetic field distribution is obtained.

As explained in detail above, according to the present invention, a coil that generates an extremely uniform magnetic field can be obtained by simply removing a part of the upper layer winding of the bank-wound coil, and the wire used can be printed wiring, etc. It doesn't need to be a special wire; it can be easily wound mechanically, and the distributed capacitance is reduced, resulting in less high frequency loss. Furthermore, since the connections between blocks are made on the sides, the bubble drive magnetic field is not disturbed, and the magnetic bubble Valid for the device.

[Brief explanation of the drawing]

Figures 1a and b are explanatory diagrams of a conventional bubble drive coil;
Figures a and b are explanatory diagrams of the bubble drive coil of the present invention;
The figure is a schematic sectional view showing an embodiment of the present invention, and FIG. 4 is a graph showing the characteristics of the coil shown in FIG. 3. In the drawing, 2 and 3 are coils, 2a to 2L 3at 31
is each block.

Claims (1)

[Scope of utility model registration request] In a magnetic bubble drive coil in which a magnetic bubble chip is inserted inside to generate a bubble drive rotating magnetic field, the multilayer coil is divided into multiple small blocks, each small block is multilayered, and the small block coils are sequentially wound. By closely connecting and continuing in the core direction, a multilayer coil structure with a rectangular cross section having a surface parallel to the surface of the bubble chip is obtained, and the rotating magnetic field distribution in the multilayer coil is uniform over the entire length of the coil. The upper layer winding of the small block is selectively removed to form the shape, and the diagonal winding portion between the winding end of the small block and the next small block is used as the multilayer coil. A magnetic bubble drive coil characterized by a magnetic bubble drive coil that comes on the side of the.