JPS6366406B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing an uncut wound core using an amorphous magnetic ribbon.

In recent years, iron core materials have made remarkable progress, and various low-loss iron core materials have been developed. Among these, an amorphous magnetic ribbon called amorphous is attracting attention as a new core material, and research is underway to use this material in the wound cores of distribution transformers and potential transformers. The above-mentioned amorphous magnetic ribbon exhibits excellent magnetic properties with significantly lower core loss and excitation current than conventional silicon steel sheets. On the other hand, since it is manufactured using an ultra-quenching method, the thickness of the magnetic ribbon is only 150 μm. Below, the width is limited to 50 to 100 mm. Therefore, when these amorphous magnetic ribbons are used as the wound core of a distribution transformer, the thickness must be very thin, and in order to obtain the necessary core width, for example, as shown in Figure 1, It is necessary to carefully consider the fact that several strips must be wound horizontally and that the shape is likely to collapse. That is, it is difficult to manufacture with the conventional wound core structure. Therefore, as shown in Fig. 1, two types of amorphous magnetic ribbons a ₁ and a ₂ with different widths are wound side by side in a wound core 1 wound using amorphous magnetic ribbons. Iron core block 1a
When winding, the joints 1a and ₂ tend to overlap or create gaps, and as a result,
There was a drawback that the space factor of the iron core deteriorated, resulting in a decrease in core holding capacity. In addition, in order to prevent the wound core 1 from deforming, the winding is performed while inserting reinforcing materials (for example, silicon steel plates) (not shown) having the same width as the core blocks on both sides of each core block 1a, 1b, 1c in the stacking direction. However, the production of wound cores using amorphous magnetic ribbons was very time-consuming and troublesome.

In view of the above-mentioned points, the present invention has been developed to streamline an uncut-shaped wound core by using an amorphous magnetic ribbon manufactured by an ultra-quenching method, which has very excellent magnetic properties but is difficult to handle as a core material. Examples of the present invention will be described below with reference to FIGS. 2 to 5.

FIG. 2A is a first example showing the overall shape of the wound core 11 manufactured by the method of the present invention as a conventional example.
This is a front view of the same rectangular shape as in Figure A.
Figure 2B and Figure 2C are B-B of Figure 2A, respectively.
FIG. The wound core manufactured by the method of the present invention, indicated by reference numeral 11, has five blocks of cores 11a, 11b, 11c,
It consists of 11d and 11e. That is, as shown in FIG. 3A, the first core block 11a constituting the center of the wound core 11 has the largest winding layer thickness, and as shown in B and C in FIG. Second and third core blocks 11b and 11 are sequentially smaller than the core block 11a, which is the center of the wound core 11.
c, 11d, 11e, and each of these iron core blocks 11a, 11b, 11c, 11d, 11e
Among the respective core window dimensions in , the dimension L between the yoke parts a and a is the same for each of the above core blocks, and the dimension l between the leg parts b and b is the same for each of the above core blocks 11a, 11b, 11c. ,11d,11
It is set to become longer as the winding layer thickness of e becomes progressively smaller. Then, in each of these core blocks, second core blocks 11b and 11c are stacked on both end faces perpendicular to the winding direction of the first core block 11a, which is the center and has the largest winding layer thickness, and Iron core block 11b, 11
By stacking the third iron core blocks 11d and 11e on the end face of c, as shown in FIG. 2B,
The cross-sectional shape of the leg part B is a circular shape that is inscribed in a circle, and the cross-sectional shape of the yoke part A is a semi-ellipse that is not inscribed in a circle but partially protrudes, as shown in Fig. 2C. A wound core 11 formed into a shape is configured. The reason why the cross-sectional shapes of the yoke a and the leg b of the wound core 11 are different is that in each core block, the dimensions between the yoke a and a are the same, but between the legs b and b. This is because the dimensions are different for each core block.

Next, the method of manufacturing the wound core 11 will be explained with reference to FIGS. 4 and 5. First, the amorphous magnetic ribbon 12 (wide width a ₁ ) is placed on the winding frame 13 with the required winding layer thickness. A quasi-rectangular wrapping body 14 is formed by winding it until it becomes flat, and then, as shown in FIG. Then, a heat-resistant (for example, ceramic-based) adhesive is applied to the laminated end faces on both sides perpendicular to the winding direction of the winding body 14, and then
By heating and curing the above adhesive at ~150°C, for example,
A first core block 11a is formed. and,
The formed iron core block 11a is attached to the winding frame 13
Even if the press plate 15 is removed, the heat-resistant adhesive maintains the rectangular shape without causing deformation. By repeating the above-mentioned work steps, second and third core blocks 11b, 11c, 11 having the required winding layer thickness are prepared in the same manner as the first core block 11a.
d, 11e (in this case, the first core block 1
It is sufficient to form an amorphous magnetic thin ribbon having a width _a2 narrower than 1a). In addition, when forming the second and third core blocks by winding the amorphous magnetic ribbon 12, in order to make the dimensions between the legs b and b of each core block different, the winding frame 13 is Of course, each time the core blocks 11a, 11b, 11c, 11d, and 11e are wound, the dimensions must be changed and the windings performed. Next, each core block formed as described above is obtained by stacking second core blocks 11b and 11c on both side end surfaces of the first core block 11a forming the center of the wound core 11, as described above. , this second core block 11
A third iron core block 11d is placed on both sides of b and 11c.
11e are stacked, and then a tightening member (not shown) such as a glass tape is wound around the leg part b and the yoke part a of the wound core 11, respectively, to complete the manufacture of the wound core 11. be.

Although the present invention has been described with reference to an example in which two types of amorphous magnetic ribbons with different widths are used for the iron core block, the present invention is not limited to this, and it is possible to use only amorphous magnetic ribbons with the same width. The number of core blocks may also be arbitrarily selected depending on the transformer capacity.

Furthermore, the present invention can be realized even if the means for fixing each core block is not based on a tightening member, but instead is fixed between each core block with an adhesive.

As explained above, in the present invention, the dimensions between the yoke parts of the plurality of core blocks constituting the wound core are the same, but the dimensions between the leg parts gradually decrease as the winding layer thickness becomes smaller. Therefore, each core block is provided with a heat-resistant adhesive applied to the laminated end face and cured. A wound core using amorphous magnetic ribbon is manufactured by stacking core blocks with decreasing winding layer thickness in a stepwise manner on the end face of the lamination, and fixing each of these core blocks with fixing means such as glass tape. The present invention has the following effects.

The present invention can be applied to a wound core in which amorphous magnetic ribbons of different widths are wound side by side, as in the past.
This is completely different from cases where the joints of the amorphous magnetic thin strips arranged side by side overlap each other during winding, gaps occur, or unevenness in the winding thickness dimension occurs. The manufacturing method is
The joint end faces of each core block with different winding layer thickness are
Since the adhesive applied in advance is heated and cured to form a smooth surface, when the core blocks are joined to assemble the wound core,
The joint end faces of each core block can be easily and tightly connected without creating gaps, etc. As a result, the space factor of the wound core can be maintained at a good level, and the deterioration of core characteristics caused by deterioration of the space factor can be eliminated. be able to.

In addition, the present invention involves individually winding each core block with different winding layer thicknesses, and
The laminated end faces of each of these core blocks are individually coated and fixed with adhesive, and each core block with the laminated end faces fixed is sequentially coated with winding layers on both sides of the laminated end face of the core block with the largest winding thickness. The method of constructing a wound core is to stack smaller core blocks in a stepwise manner and then fix each of these core blocks with fixing means such as glass tape. Therefore, when assembling the wound core, it is possible to Simply wrap different core materials individually and stack them together.
Moreover, since the laminated end faces of the individual wound core blocks are fixed in advance with adhesive and are firmly maintained in a rectangular shape, each core block tends to lose its shape when assembling the wound core. Despite the use of amorphous magnetic ribbon, it is extremely easy to handle, and as a result, this seed-wound core can be manufactured quickly and easily without any deterioration of the core properties.

Furthermore, in the present invention, the lengths between the yoke parts of each core block are provided with the same dimension, and only the length dimension between the leg parts is formed so that the core blocks whose winding layer thicknesses are successively smaller are successively larger. Therefore, the cross-sectional shape of the leg of the wound core is circular, and the cross-sectional shape of the yoke is a semi-ellipse, unlike the cross-section of the leg. Therefore, the center of the yoke is usually the center of the circle O ₁ as shown in FIGS. 2A and C.
However, in the present invention, as a result of providing the yoke section so that it has a semi-elliptical shape, the center of the yoke section is
Since O ₂ is necessarily located below the normal center O ₁ , the average magnetic path length of the wound core can be made shorter than that of a conventional wound core. In order to reduce the weight of the core itself and improve the core properties, by manufacturing the wound core using amorphous magnetic ribbon using the method of the present invention, the core is small and lightweight, and the core loss and excitation current are significantly reduced. It becomes possible to provide a wound core with excellent core characteristics.

As explained above, the manufacturing method of the present invention makes it easy to handle each core block made of amorphous magnetic ribbon that easily loses its shape, so it can be manufactured into an energy-saving uncut type with extremely low core loss and excitation current. It has the remarkable feature that a wound core can be manufactured smoothly and satisfactorily without impairing the core properties.

[Brief explanation of drawings]

Figure 1A is a front view showing a conventional wound core.
Figure B is a sectional view taken along the line A-A in Figure 1A, Figure 2A is a front view showing the wound core of the present invention, Figure 2B is a sectional view taken along the line B-B in Figure 2A, and Figure 2A is a front view showing the wound core of the present invention. Figure C is a sectional view taken along line CC in Figure 2A, Figure 3A, B,
C is a front view of each core block constituting the wound core of the present invention, FIG. 4 is a schematic diagram showing an apparatus for carrying out the present invention, and FIG. 5 is a front view showing the wound core of the present invention in progress. It is. 11...winding core, 11a...first core block,
11b, 11c...second iron core block, 11c,
11d...Third core block, a...Yoke, b...
leg.

Claims (1)

[Claims] 1 A plurality of iron core blocks with different winding layer thicknesses are made of amorphous magnetic thin film so that the length between the yoke parts is the same, but the length between the leg parts increases as the winding layer thickness becomes smaller. After forming a rectangular shape by winding it into a rectangular shape using a band, coating the laminated end faces on both sides of each iron core block with different winding layer thickness with a heat-resistant adhesive and curing the heat-resistant adhesive, Core blocks with decreasing winding layer thickness are stacked in a stepwise manner on both end faces perpendicular to the stacking direction of the core block with the largest winding layer thickness, and each of these iron core blocks is fastened with a tightening member such as glass tape or heat-resistant adhesive, etc. A method for manufacturing a wound core, characterized in that the wound core is formed by integrally fixing the wound iron core using fixing means.