JP3027465B2 - Manufacturing method of amorphous wound iron core - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a core for an amorphous magnetic material using an amorphous magnetic material, and more particularly to a core for an amorphous magnetic material used in a transformer.

[0002]

2. Description of the Related Art As a technique relating to a conventional wound iron core using an amorphous magnetic material, there is disclosed in Japanese Patent Application Laid-Open No. 58-112.
A technique described in Japanese Patent Publication No. 310 is known.

[0003] According to this technique, the laminated amorphous ribbon is wound with an iron core clamp plate attached to the inside and outside thereof, and a wound iron core is formed as shown in FIG.

[0004]

A wound core made of an amorphous magnetic material (hereinafter referred to as an "amorphous wound core") is formed into a wound core in order to eliminate the influence of stress caused by winding on the wound core. Then, annealing in a magnetic field is performed.
As shown in FIG. 10, it is desirable to perform this annealing with the wound core horizontally installed, from the viewpoints of easiness of operation and simplification of the configuration of the annealing device. In the drawing, reference numeral 1012 denotes an electrode for generating magnetism for magnetic annealing.

[0005] However, when forming a large wound core according to the conventional technique, unless the tightening force of the clamp plate is increased, if the wound core is installed horizontally, as shown in FIG. Due to its own weight, the central part of the stack hangs down like a bamboo shoot. FIG. 11 shows a cross section obtained by cutting a part of the wound core in a direction perpendicular to the laminating direction.

[0006] When the core is used for a transformer, the coil is opened once after annealing and the coil 120 is opened as shown in FIG.
1, 1202 is inserted and re-wound to form a wound core, but if the center of the stack hangs down in a mushroom shape as described above during annealing, it becomes difficult to insert the coil, or during re-winding, The ends of the ribbons do not overlap well, so that the properties of the wound iron core are deteriorated or cracks are easily generated.

Such a mushroom-shaped sag at the center of the stack can be prevented by increasing the clamping force of the clamp member in the stacking direction. However, when annealing is performed in the overtightened state, seizure occurs between the amorphous ribbons. This seizure significantly increases the eddy current loss of the wound iron core and increases the iron loss.

Accordingly, an object of the present invention is to provide a method for manufacturing an amorphous wound iron core that can prevent a mushroom-shaped sag at the center of the lamination without overtightening.

[0009]

To SUMMARY OF THE INVENTION To achieve the above object, the present invention is an amorphous material ribbon to a manufacturing method of an amorphous wound iron core wound in multiple layers, the inside of the winding core
Attach the inner clamp material and attach the inner clamp outside the core.
Install the outer clamp member to pump material facing position, winding
Amol composed of the rotated amorphous material ribbon side
One of two surfaces perpendicular to the winding axis of the thin ribbon
The surface of the core support material, the inner clamp material and the outer
Place the inner clamp between the clamp
Prescribed as the distance between the lamp material and the outer clamp material
To secure the thickness of the amorphous strip
Between the inner clamp material and the outer clamp material
The occupied space ratio is 80 to
Formed wound core by tightening to maintain 88%
Then, the surface of the formed core wound with the core support material attached thereto is
As the bottom surface, the core is subjected to excitation annealing.
Provided is a method for manufacturing an amorphous wound iron core.

[0010]

According to the method of manufacturing an amorphous wound iron core according to the present invention, an iron core supporting member for preventing falling of an amorphous ribbon is attached, and the core to which the iron core supporting member is attached is subjected to excitation annealing using the bottom surface as a bottom surface. Therefore , the iron core can maintain its shape without drooping even if it is loosely tightened.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for manufacturing an amorphous wound iron core according to the present invention will be described.

First, the outline of the manufacturing process from the rolled amorphous sheet material, which is the material of the wound core, to the installation to the annealing of the wound core will be described.

FIG. 7 schematically shows a part of the system for manufacturing an amorphous wound iron core, which is involved in a manufacturing process from installation of a roll-shaped amorphous ribbon to annealing of a wound iron core.

In the drawing, reference numeral 704 denotes a roll-shaped amorphous seal.
701 is an uncoiler device, 702 is a cutting device,
703 is a rectangular forming device, 705 and 707 are laminated amorphous sheet materials, 708 is a film thickness measuring device, 709 is an extrusion feeding device, 710 is a cutter, 711 is a measuring device, 7
12 is a tension feeder, 713 is a holding metal, 719 is a wound core being formed, 720 is a rectangular core, 725 is an annealing device,
730 is a wound iron core during annealing.

In such a wound core manufacturing system, the manufacturing of the wound core is performed according to the procedure shown in FIG.

That is, the roll-shaped amorphous sheet material 704 is set on the reel of the uncoiler device 701 (step 801), and the laminated amorphous sheet material is set on the extrusion feed device 709. Then, the path and the slack are inspected (step 802), and the cutting device 70 is checked.
2 is started (step 803).

When the cutting device 702 starts, the extrusion feeding device 709 and the pulling feeding device 712 feed the laminated amorphous sheet material to the cutter 710 (steps 804 and 805), and the cutter 710 outputs the laminated amorphous sheet material. (Step 80)
6). The cut laminated amorphous ribbon is measured by a measuring instrument 71.
It is sent to the localization value above 1 and weighed (step 808).
The apparatus repeats the above operation a predetermined number of times (step 80).
9) Amorphous sheet ribbons are sequentially laminated to a localization value for each of a plurality of sheets. The amorphous sheet thin ribbons stacked in a predetermined amount are sent to a transfer position to the rectangular forming device 703 (steps 811 and 802).

The rectangular forming device 703 holds the laminated amorphous ribbon received from the cutting device 702, and
Then, the core is fixed on the rectangular cored bar (step 815), and a wound core is formed using a clamp material and an iron core supporting material described later (steps 816 and 817).

The wound iron core 7 formed by the rectangular forming device 703
30 is sent to an annealing device 725, and is magnetically annealed together with a clamp material and an iron core support (step 821).

After annealing, the winding is opened once, a coil is inserted as shown in FIG. 11, and the winding is wound again to form a winding core, thereby forming a transformer.
3 will be described.

FIG. 1 is a front view of a formed wound core.

As shown in the figure, in the present embodiment, the amorphous magnetic core 1 is formed in a predetermined shape from the amorphous magnetic ribbon 1 laminated from the inner side to the outer side. The clamp plates 4 and 5 in the side direction are held in a rectangular shape, and an amorphous magnetic ribbon is wound around the outside thereof.

However, in this state, since a gap is formed between the amorphous ribbons, the amorphous core 1 is fastened to the outside of the iron core with the long side clamp plates 6 and 7 and the short side direction clamp plates 8 and 9. . Then, each of the clamp members 6, 7, 8, 9 attached to the outside is bolted to the opposing inner clamp members 2, 3, 4, 5 by bolts 10, 11, 12,.
13 and the lower four screws.

Tightening is performed so that a predetermined space factor (80 to 88%) of the amorphous iron core 1 is obtained. However, for example, assuming a large wound core such as an amorphous core for a rated 75 kVA transformer, the weight is 170 kg to
Since the weight is about 200 kg, it is difficult to maintain the shape due to the frictional force between the amorphous ribbons due to the weight of the amorphous iron core when installed horizontally, and the central part of the iron core slides downward.

Therefore, in this embodiment, in order to prevent this, the core support members 14, 15, 1
6 and 17 are provided. The core lower end means the core end that becomes the lower surface during annealing.

It should be noted that the shape, mounting location and number of the core support members may be arbitrarily adjusted according to the size of the iron core. That is, for example, the support members 16 and 17 in the short side direction
May be omitted.

FIG. 2 is a side view of the formed wound core.

In this embodiment, the core support members 14, 15, 1
6, 17 are integrated with the outer clamping members 6, 7, 8, 9 from the beginning. That is, for example, in FIG.
Outer clamp member 7, core support member 15, outer clamp member 6
And the core support member 14 are integral with each other, and the outer clamp member and the core support member form an L-shape.

FIG. 3 shows a lower cross section of the formed wound core.

As shown in the figure, the radial length of the iron core supporting member 14 is a length 1 capable of obtaining a predetermined space factor (80 to 88%). In FIG. 3, the outer clamp member 6 and the core support member 14 are integrated by welding or the like.

By the way, as shown in FIG. 4 as a second embodiment, the core support member 18 may be fitted between the outer clamp member 21 and the inner clamp member 22.
FIG. 4A shows a lower cross section of the formed wound core, and FIG.
(B) shows the lower side surface of the formed wound core.

Further, as shown in FIG. 5 as a third embodiment, a structure may be adopted in which the tightening bolts 14 for tightening the outer clamp member 23 and the inner clamp member 24 support the iron core 1. FIG. 5 shows a lower cross section of the formed wound core.

As shown in FIG. 6 as a fourth embodiment, in order to avoid the influence of unevenness of the screw portion of the bolt, a tubular member is provided around the tightening bolt 19 for tightening the outer clamp member 25 and the inner clamp member 26. The material 20 may be put into the core supporting material. FIG. 6 shows a lower cross section of the formed wound core.

As described above, the iron core thus formed is subjected to magnetic field annealing at a predetermined temperature of 300 to 400 ° C. in an annealing furnace. The core wound in this way exhibits excellent core loss characteristics without seizure between the amorphous ribbons. However, when the core is tightened so that there is no core support material and the core is not displaced (the space factor) 90% or more) and the iron loss after annealing when tightening with a clamp material provided with an iron core supporting material (occupation ratio of 86%) is improved by about 10 to 15%. The space factor refers to the ratio of the volume of the amorphous ribbon to the volume of the wound core including the gap between the amorphous ribbons.

Further, since the amount of tightening by the clamp member is determined by the iron core supporting member 14, overtightening is eliminated. Further, according to the structure shown in FIG. 4, the clamp and the iron core supporting member are each made of a flat plate, so that no space is required for storage. Similarly, in the structure shown in FIG. 5, since the clamp and the iron core supporting member are each a flat plate, it is possible to obtain an effect of saving space for storage.

[0036]

As described above, according to the present invention, it is possible to provide a method of manufacturing an amorphous wound iron core that can prevent a mushroom-shaped sag at the center of the lamination without overtightening.

[Brief description of the drawings]

FIG. 1 is a plan view of an amorphous wound iron core formed by a method of manufacturing an amorphous wound iron core according to one embodiment of the present invention.

FIG. 2 is a front view of an amorphous wound core formed by a method for manufacturing an amorphous wound core according to one embodiment of the present invention.

FIG. 3 is a lower cross-sectional view of an amorphous wound core formed by a method of manufacturing an amorphous wound core according to one embodiment of the present invention.

FIG. 4 is a bottom sectional view of an amorphous wound iron core formed by a method of manufacturing an amorphous wound iron core according to a second embodiment of the present invention.

FIG. 5 is a lower sectional view of an amorphous wound core formed by a method of manufacturing an amorphous wound core according to a third embodiment of the present invention.

FIG. 6 is a lower sectional view of an amorphous wound iron core formed by a method for manufacturing an amorphous wound iron core according to a fourth embodiment of the present invention.

FIG. 7 is an explanatory view schematically showing a system for manufacturing an amorphous wound iron core.

FIG. 8 is a flow chart showing a manufacturing procedure of an amorphous wound iron core.
It is a chart.

FIG. 9 is a front view of an amorphous wound iron core.

FIG. 10 is an explanatory view showing an amorphous wound core during annealing.

FIG. 11 is a lower sectional view of an amorphous wound iron core according to a conventional manufacturing method.

FIG. 12 is an explanatory diagram showing a transformer using an amorphous core.

[Explanation of symbols]

 Reference Signs List 1 amorphous magnetic core 2, 3, 4, 5 inner clamp plate 6, 7, 8, 9 outer clamp plate 14, 15 iron core support 16, 17 iron core support 10, 11, 12 volts 13, 19, 27, 28 volts

──────────────────────────────────────────────────続 き Continuing from the front page (72) Kazumi Ito 2-4-1, Nishi-Atsujigaoka, Chofu-shi, Tokyo Tokyo Electric Power Company R & D Laboratory (72) Inventor Shoichiro Eri 2-4-1, Nishi-Atsujigaoka, Chofu-shi, Tokyo (56) References JP-A-4-17313 (JP, A) JP-A-61-180413 (JP, A) JP-A-62-128509 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) H01F 27/24-27/26 H01F 41/02

Claims (5)

(57) [Claims] 1. A amorphous material ribbon to a manufacturing method of an amorphous wound iron core wound in multiple layers, attaching the inner clamp member to the inside of the wound core, the inner clamping member and a position facing the outside of the wound core to attach the outer clamping member, composed of amorphous material strip side wound on one side of the two perpendicular faces in winding axis of amorphous material ribbon, the core supporting member, said inner clamp Material and the outside
Apply so that it intervenes between the side clamp material and the inside
The distance between the clamp and the outer clamp
<br/> Attach to ensure a constant amorphous material ribbon product Atsucho, between said outer clamping member and the inner clamp member, wound
The rotated amorphous ribbon has a space factor of 80 to 88%.
The core is formed by tightening so that the core support is attached to the bottom surface of the formed core.
A method for producing an amorphous wound core, wherein the core is subjected to excitation annealing. 2. A manufacturing method of an amorphous wound iron core according to claim 1, wherein the core support is an integral with the inner clamping member or said outer <br/> side clamp member, the inner clamping member or production method of the amorphous wound iron core, characterized by being mounted with the mounting of the outer clamping member. 3. A manufacturing method of an amorphous wound iron core according to claim 1, wherein the inner clamping member and said outer clamping member includes a fitting hole which faces during installation of the wound core, the core supporting member is a fitting and fitted into Goana method amorphous wound iron core, which is a member of bridged and the inner clamping member and said outer clamping member. 4. The manufacturing method of an amorphous wound iron core according to claim 1, wherein the core supporting member is a bolt for widening or narrowing between said outer clamping member and the inner clamp member, the inner clamping member and said A method for manufacturing an amorphous wound iron core, wherein the tightening between the outer clamp material and the outer clamp material is performed using the bolt. 5. A manufacturing method of an amorphous wound iron core according to claim 1, wherein the core supporting member is a tubular member to be inserted into the bolt for widening or narrowing between the inner clamping member and the outer clamping member, clamping between <br/> with the inner clamping member and said outer clamping member, a manufacturing method of an amorphous wound iron core, characterized in that it is performed using the bolts.