JPH0567537A - Manufacture of amorphous iron core - Google Patents

Abstract

PURPOSE:To provide a manufacture of an amorphous iron core which makes the break work after heat treatment easy to do by arranging the caking agent of an adhesive tape used in a manufacture process not to spread to the peripheral sections. CONSTITUTION:A work block 1, where three pieces of laminate blocks where amorphous foils are stacked are bundled, is wound on a mold 2, and the end is temporally fixed with an adhesive tape 3. When stacking a work block 5 thereon, the work of breaking the iron core being performed after heat treatment is made easy to do by covering the vicinity of the adhesive tape 3 with a separator 4, and arranging the caking agent of the adhesive tape 3 not to spread to the peripheral section.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art It is known that when an amorphous magnetic material is used for an iron core, iron loss can be significantly reduced as compared with an iron core using a silicon steel plate. Therefore, the practical application of an iron core using an amorphous magnetic material has been studied.
The iron core structure can be a non-cut structure or a one-turn cut structure, but since the former structure inevitably increases the size of the transformer, a one-turn cut structure is now the mainstream. In manufacturing the iron core, the amorphous material has a thickness of 1/10 or less of that of the silicon steel plate, so that a plurality of laminated sheets having a thickness of 0.1 to 3 mm are first made into one laminated block. One or a plurality of these laminated blocks are wound as a working block on a molding die, the butted portions are temporarily fixed with an adhesive tape, and the next working block is sequentially laminated on top of that to form the desired core shape. After forming, an iron core is manufactured by performing heat treatment while applying a magnetic field. After that, the iron core is disassembled into work blocks again (disassembling process) and inserted into a coil to manufacture a transformer.

[0003]

When the amorphous materials are laminated and heat-treated as described above, at 300 to 330 ° C., for example, the binder of the adhesive tape is partly decomposed by heat and the adhesive component is a block butt portion. Spread to
It has a drawback that the disassembling work after the heat treatment becomes difficult. On the other hand, when the heat treatment temperature is set to 340 to 400 ° C., the binder of the adhesive tape is completely decomposed, but the amorphous material itself becomes brittle, which makes it difficult to handle. On the other hand, a method of stacking work blocks without using an adhesive tape can be considered, but it is difficult to put into practical use because workability is significantly reduced.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a method for producing an amorphous iron core in which the binder of the adhesive tape is prevented from spreading to the peripheral portion.

[0005]

In order to achieve the above object, in the method for producing an amorphous iron core of the present invention, a separator made of a material that is hard to deteriorate under heat treatment conditions is covered with an adhesive tape between work blocks. I'm trying to stack work blocks with a sandwich.

[0006]

The separator sandwiched between the work blocks prevents the adjacent work blocks from adhering to each other even if the adhesive tape is partially decomposed by heat and the adhesive component spreads to the abutting portions of the blocks.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. The manufacturing procedure of the iron core is basically the same as that described in the conventional example.After winding and laminating the foil strip of the amorphous magnetic material, a part of the laminated product is cut in the width direction and the adhesive is applied to the cut surface. After coating and curing, this amorphous material laminated product is divided into laminated blocks having a thickness of 0.1 to 3 mm in the laminating direction, and one or more of these laminated blocks is wound as a working block on a molding die. In this method, the butted portion is temporarily fixed with an adhesive tape, the next work block is sequentially laminated on the butted portion to form a desired core shape, and then heat treatment is performed while applying a magnetic field to manufacture the iron core.

FIG. 1 shows an iron core during the lamination process according to the present invention. The work block 1 is formed by bundling three laminated blocks having a thickness of about 1 mm and shifting the end positions by 15 mm. The work block 1 is wound around a molding die 2, and the butted portion is temporarily fixed with an adhesive tape 3. After the temporary fixing is completed, the next work block 5 is wound around the work block 1 while sandwiching the separator 4 so as to cover the adhesive tape and the butted portion. Thereafter, work blocks are stacked in the same manner, and stacked until a predetermined thickness is reached.

Nomex, PP as the separator
An insulating material having heat resistance such as S or Kapton is most preferable, but the insulating material is not limited thereto.

[0010]

As is apparent from the above description, the method for producing an amorphous iron core of the present invention has the following advantages.

(1) The work of stacking and disassembling the amorphous iron core is facilitated. 2 It is possible to use general-purpose adhesive tape, which leads to cost reduction.

(3) It is possible to prevent damage to the iron core during the disassembling work, and easily manufacture an iron core having excellent performance.

[Brief description of drawings]

FIG. 1 is a diagram showing an iron core in the middle of a laminating process according to the manufacturing method of the present invention.

[Explanation of symbols]

 1 Working Block 2 Mold 3 Adhesive Tape 4 Separator 5 Next Working Block

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiromitsu Hara 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (1)

[Claims] 1. After winding and laminating a foil strip of an amorphous magnetic material, a part of the laminated product is cut in the width direction, an adhesive is applied to the cut surface and cured, and then the amorphous material laminated product is formed. It is divided into laminated blocks with a thickness of 0.1 to 3 mm in the laminating direction, one or a plurality of these laminated blocks is used as one working block, and this working block is wound around a molding die, and the butt portion is bonded. In the method of manufacturing iron cores by temporarily fixing with tape and sequentially stacking work blocks to form the desired core shape and then heat treating while applying a magnetic field, it is made of a material that does not easily deteriorate under heat treatment conditions between work blocks. A method for manufacturing an amorphous iron core, which comprises stacking the following work blocks with a separator interposed therebetween.