JP2923148B2 - Amorphous core - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an amorphous wound core in which an amorphous magnetic material ribbon is wound in multiple layers.
The present invention relates to a structure of a joint portion of an amorphous wound iron core.

[0002]

2. Description of the Related Art Amorphous magnetic iron cores used in stationary induction electrical equipment such as transformers are usually formed by cutting a thin ribbon of amorphous magnetic material and stacking it in multiple layers, and winding this around a cored bar. Created as a manufactured amorphous core.

[0003] Such winding of the amorphous magnetic material ribbon is performed for a plurality of sheets, and a set of the amorphous magnetic material ribbons that can be wound at one time is called a unit. One unit has a plurality of layers, and each layer has 10 to 30 layers.
It is composed of about an amorphous ribbon. In each unit, both ends of the wound amorphous magnetic material ribbon layer constituting the layer are abutted such that the abutting position of each layer is sequentially shifted from the abutting position of the adjacent layer for each layer. By doing so, both ends are joined.

Here, in the conventional amorphous wound iron core, the number of layers constituting each unit is all the same, and the abutting position is shifted for each layer, and the shifting dimensions are all the same.

[0005]

However, in such a conventional amorphous wound iron core, if the offset dimension is set to be small, since the corner radius is small on the inner peripheral side of the iron core, the springback of the amorphous magnetic material ribbon is strong. In other words, at the end point of the winding, the lap work of covering one end of each unit with the other end is not easy because the two ends of each layer are abutted, and the workability deteriorates. On the other hand, if the shift dimension is set to be large, the number of layers in one unit cannot be increased because the circumference on the inner peripheral side of the iron core is small. As a result, the number of lap operations increases and the workability deteriorates. Further, in the conventional amorphous core, the influence of the number of layers constituting one unit on the characteristics of the core is not considered.

Accordingly, an object of the present invention is to provide an amorphous wound iron core having a structure capable of improving the workability of a lapping operation. It is another object of the present invention to provide an amorphous wound core in which one unit is constituted by the number of layers without adversely affecting the characteristics of the wound core.

[0007]

In order to achieve the above-mentioned object, the present invention provides an amorphous wound iron core formed by winding a plurality of stacked amorphous magnetic material thin ribbons, wherein the wound amorphous core comprises at least one wound amorphous magnetic material ribbon. Each end of the magnetic material ribbon is aligned, and a plurality of unit layers each having three or more butting layers whose both ends are butted are provided. In each of the unit layers, each butting layer is the same as the butting layer. Belonging to the unit layer, and being shifted in the circumferential direction by a predetermined offset dimension from the circumferential position of the butting layer adjacent to the inner circumferential side of the butting layer, both ends are butted at circumferential positions. An amorphous wound iron core is provided.

[0008]

According to the amorphous wound core of the present invention, each unit layer (unit) is composed of three or more butting layers, and in each of the unit layers, both ends of each butting layer are connected to the butting layer. Butts that belong to the same unit layer, and have a circumferential position shifted by a predetermined shift dimension in the circumferential direction from the circumferential position of the butting layer adjacent to the inner circumferential side of the butting layer. .

Therefore, the butting of the two butting layers is not located at the same circumferential position across one butting layer. Therefore, the crossover magnetic flux due to the two butting gaps separating one butting layer does not concentrate on the butting layer separating both, so that the characteristics of the wound iron core are not deteriorated.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of an amorphous wound iron core according to the present invention will be described below.

FIG. 1 shows a front view of an amorphous wound iron core according to this embodiment.

As shown in the figure, an amorphous wound iron core 2 according to the present embodiment is an iron core in which an amorphous magnetic material ribbon 4 is wound in multiple layers, inserted into two coils 3 and used as a transformer. The upper yoke of the wound iron core 2 includes a wrap portion 1 in which both ends of a wound amorphous magnetic material ribbon 4 are joined by abutting each other.

FIG. 2 shows the wrap portion 1 in an enlarged manner.

As shown in the drawing, the amorphous wound iron core according to the present embodiment has three layers of the first unit, three layers of the second unit, four layers of the third unit, and five layers of the fourth unit from the innermost circumference. , The fifth unit is composed of six layers. Each layer is 10
It is composed of about 30 amorphous ribbons.

A gap 6 formed by abutting both ends of each layer.
Is about 0 to several mm, and the distance between the gaps between adjacent layers is about 15 mm to 30 mm for the inner peripheral unit of the amorphous wound iron core, and about several mm to 15 mm for the outer peripheral unit. In addition, the gap of each layer in each unit is arranged at the center of the linear portion center position 100 from the inner peripheral side layer to the right from the left so as to be distributed in the linear portion of the upper yoke portion.

As described above, in this embodiment, the number of layers 5 constituting one unit 7 is three to five. The reason why the number of layers is three or more is that deterioration of the characteristics of the wound core is taken into consideration.

That is, FIG. 3 shows the relationship between the number of layers per unit and the no-load loss of the amorphous core.
Assuming that the no-load loss in the case of three layers is 100%, the no-load loss in the case where the number of layers per unit is two is 115%, which is extremely deteriorated.

The cause will be described with reference to FIG. That is, as shown in FIG. 4, in the gap 6 in each layer, the magnetic flux 8 crosses the gap portion over the adjacent layer and returns to the original layer again. However, in the case of two layers per unit, the magnetic flux 8 crosses from the inside and outside. Since the magnetic flux is concentrated in one place, the concentration of the magnetic flux is about 1.5 times that in the case of three layers, and the no-load loss is deteriorated.

Further, in the present embodiment, the shift dimension ΔL in the unit 7 on the inner peripheral side of the amorphous wound iron core is larger than the shift dimension ΔL in the unit 7 on the outer peripheral side. This facilitates the lap work of each unit. That is, as shown in FIG. 5, in the lapping operation, the inner radius side of the amorphous wound core 2 has a small corner radius R, so that the springback of the core material is large and the workability is poor. In addition, if the shift dimension ΔL on the inner peripheral side is increased, the overlapping portion with the adjacent layer increases, so that the lapping operation can be easily performed.

In this embodiment, in order to improve the workability on the inner peripheral side of the iron core, in order to increase the displacement dimension ΔL, the layer per unit on the inner peripheral side where the length of the yoke portion is limited. Fewer numbers. On the other hand, as the number of layers per unit, which is the unit of the lapping operation of the amorphous core 2, the number of lapping operations decreases, and workability is improved. Therefore, in this embodiment, from the inner peripheral side of the amorphous core,
By increasing the number of layers as the yoke length increases toward the outer periphery, the number of lapping operations is reduced and workability is improved. In addition, since the corner length is large on the outer peripheral side, the shift dimension ΔL is set small, and a larger number of layers are included in one unit.

Hereinafter, the manufacture of the amorphous wound iron core according to the present embodiment will be described.

FIG. 6 shows an apparatus for manufacturing an amorphous wound iron core. FIG. 7 shows a manufacturing procedure.

As shown in FIG. 7, first, for each unit,
The number of layers of the unit and the shift size of each layer in the unit are set (step 71). Next, the cutting dimension L of the amorphous sheet material 13 is given by the following equation according to the layer to which the amorphous sheet material 13 belongs (step 72).

L = S + 2π △ tn + a where, S: circumferential length of the rectangular metal core 15 Δt: thickness of the sheet material 13 n: cumulative number of layers of the sheet material 13 a: added for gap management of the iron core wrap portion Next, as shown in FIG. 6, an amorphous sheet material 13 formed by stacking a plurality of roll-shaped amorphous magnetic materials 12 is cut from the uncoiler device 9 into a cutting dimension ΔL, which is set in advance.
Is conveyed to the cutting device 10 by the extrusion feeding device 11 (step 73), and cut by the cutter 14 to the previously set cutting dimension ΔL (step 74).

The fixed-size amorphous ribbon 16 cut by the cutting device 10 is conveyed to the rectangular forming device 18 by the pulling and feeding device 17 (step 75), and is laminated on the rectangular metal core 15. Then, after being fixed by the presser fitting 19, it is formed into a rectangular shape by the pressure roller 20 to complete the amorphous wound iron core 21 (step 77).

In this embodiment, when the fixed-size amorphous ribbon 16 is fixed to the rectangular core 15, the rectangular core is conveyed from the center position of the rectangular core so as to have a displacement K according to the following equation. It is fixed on the gold 21 (step 76).

K = (m-1) × ΔL / 2−ma × ΔL where, m: number of layers in each unit ΔL: shift size of each layer in each unit with respect to an adjacent layer ma: cumulative number of layers in each unit With ma = 1 to m 2 or more, an amorphous wound iron core having the structure shown in FIGS. 1 and 2 can be manufactured.

[0028]

As described above, according to the present invention, it is possible to provide an amorphous wound iron core having a structure capable of improving the workability of the lapping operation. Further, it is possible to provide an amorphous wound core in which one unit is constituted by the number of layers without adversely affecting the characteristics of the wound core.

[Brief description of the drawings]

FIG. 1 is a front view showing an amorphous wound iron core transformer according to one embodiment of the present invention.

FIG. 2 is an enlarged view showing a wrap portion of an amorphous wound iron core.

FIG. 3 is a characteristic diagram showing a relationship between the number of layers per unit and a no-load loss characteristic.

FIG. 4 is an explanatory diagram showing a relationship between a wrap structure and a magnetic flux in an iron core.

FIG. 5 is an explanatory view showing a wrapping operation of an amorphous wound iron core.

FIG. 6 is an explanatory view showing an amorphous wound iron core manufacturing apparatus.

FIG. 7 is a flowchart showing a procedure for manufacturing an amorphous wound iron core.

[Description of Signs] 1 wrap portion 2 amorphous wound iron core 3 coil 4 amorphous magnetic material 5 layer 6 gap 7 unit 8 magnetic flux 9 uncoiler device 10 Cutting device 11: Extrusion feeding device 12: Rolled amorphous magnetic material 13: Amorphous sheet material 14: Cutter 15: Rectangular core 16: Fixed-size cutting sheet material 17: Tension feeding device 18: Rectangular Forming device 19 Pressing bracket 20 Press roller 21 Forming iron core

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Katsutoshi Aizawa 46-1, Tomioka, Nakajo-cho, Kitakanbara-gun, Niigata Pref. Nakajo Plant, Hitachi, Ltd. No. Tokyo Electric Power Company Technical Research Institute (72) Inventor Yasutomo Imai 2-4-1 Nishi Atsujigaoka, Chofu City, Tokyo Tokyo Electric Power Company Technical Research Institute (56) References JP-A-61-42906 (JP, A) Kaisho 60-182117 (JP, A) Shokai Sho 59-31211 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) H01F 27/24-27/26

Claims (3)

(57) [Claims] 1. An amorphous rolled end to end
A plurality of unit layers having at least three magnetic material ribbon layers are provided.
The position of the end of each end in each unit layer
Are displaced in the same direction by a predetermined dimension in the circumferential direction.
In the unit layer on the inner peripheral side of the amorphous wound core.
The offset dimension of each butted position at both ends is
The protrusions at both ends in the unit layer on the outer peripheral side of the fass-wound core
Specially, it is larger than the shift size of each
Amorphous wound iron core. 2. An amorphous material wound with its both ends abutted.
A plurality of unit layers having at least three magnetic material ribbon layers are provided.
The position of the end of each end in each unit layer
Are displaced in the same direction by a predetermined dimension in the circumferential direction.
In the unit layer on the inner peripheral side of the amorphous wound core.
The number of butted ends on the outside of the amorphous core
Than the number of the butted ends at the peripheral unit layer
An amorphous wound iron core characterized by a reduced size . 3. An amorphous material wound with both ends butt-bonded
A plurality of unit layers having at least three magnetic material ribbon layers are provided.
The position of the end of each end in each unit layer
Are displaced in the same direction by a predetermined dimension in the circumferential direction.
In the unit layer on the inner peripheral side of the amorphous wound core.
The offset dimension of each butted position at both ends is
The protrusions at both ends in the unit layer on the outer peripheral side of the fass-wound core
Make it larger than the displacement size of each
In the unit layer on the inner peripheral side of the amorphous core
The number of butted ends on the outside of the amorphous core
Than the number of the butted ends at the peripheral unit layer
An amorphous wound iron core characterized by a reduced size .