JPH11176654A - Amorphous core and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively solve adverse effect of a strip thickness deviation by orienting first sides of some of amorphous thin sheet layers to their opposite sides and, laminating them so that a half no. of the total layers orient reverse with respect to their first sides. SOLUTION: For winding or laminating an amorphous thin sheet to produce a core, resulting sheet layers are laminated with their sides alternately changed to their opposite sides so that a half no. of the total laminated sheet layers orient reverse in their lengthwise direction to cancel sheet thickness deviation. An amorphous thin sheet of 24 μm, 26 μm thick at one and the other sides is laminated to form a laminate of 4,000 layers such that 8 sets of 10 layers are shifted by 10 mm and lapped at 8 steps to form a bundle and such bundles are laminated with their lengths alternately rotated 180 deg.C, thereby effectively solving the adverse effect of the sheet thickness deviation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an amorphous iron core and a method of manufacturing the same, and it is effective to effectively improve a shape defect caused by a thickness deviation across the width of an amorphous ribbon when assembled to an iron core. Thus, the iron core having a compact and good shape is to be finished.

[0002]

2. Description of the Related Art Amorphous alloy ribbons exhibit not only a high specific resistance but also excellent soft magnetic properties due to the disappearance of magnetic anisotropy due to lack of a crystal structure. Manufacturing iron cores at low yields transformers with low loss and energy efficiency. Amorphous alloy ribbons are manufactured by injecting molten alloy onto rollers rotating at high speed and rapidly quenching and solidifying them. Thus, a thickness of several tens of microns or less can be obtained, but the thickness deviation is also several percent.
Usually there is a degree.

[0003] In order to be used as an iron core, it is necessary to laminate 1,000 or more such thin strips having a large thickness deviation, but such a thickness deviation is not affected in the core shape after lamination. In some cases, the thickness difference between both sides may be several millimeters or more. To avoid this situation,
In JP-A-59-115508, two sheets of amorphous steel sheet having different thicknesses on both sides in the width direction are made into one set, and the thick side of one amorphous steel sheet is replaced by the sheet thickness of the other amorphous steel sheet. A method has been proposed in which a transformer core is manufactured by winding or stacking such a pair of amorphous steel sheets that are superimposed so as to face the thin side of the sheet.

Japanese Patent Application Laid-Open No. 4-302114 proposes a method for reducing the thickness deviation by laminating and adhering several amorphous sheet materials, and then laminating them to form an overlap core. I have. Further, Japanese Patent Application Laid-Open No. 6-13253 discloses that, in a step wrap cut type wound core, a laminated portion is divided into several blocks, and at least an outer peripheral block is fixed with a dividing rod, and a joining portion is sequentially formed from an inner block. There is proposed a method of obtaining a more compact iron core by making the thickness of the lap portion uniform by overlapping the wrap portions.

[0005]

However, all of the above-mentioned prior arts have the following problems. That is, in the method disclosed in Japanese Patent Application Laid-Open No. 59-115508, it is not only a great effort is required to select sheets having the opposite thickness deviation tendency but to form a pair of the sheets, There is a problem that it is not economical because the stock of raw materials is required.

Further, when a large number of materials are laminated and adhered according to the method disclosed in Japanese Patent Application Laid-Open No. 6-13253, the thickness deviation may be averaged. Also, when the layers are stacked, not only the thickness does not become uniform in the width direction, but also the deviation may be amplified.

Further, according to the method disclosed in Japanese Patent Application Laid-Open No. Hei 6-13253, when a wrap core having as few gaps as possible between layers is made of a material having a different overlap thickness in the width direction, the wrap margin may differ on both sides. However, there is a problem that the material protrudes from the side surface to cause deterioration of the shape, and in a severe case, lapping becomes difficult.

The present invention advantageously solves the above-mentioned problem. Even when an amorphous alloy ribbon having a thickness deviation in the width direction is used, the thickness of the sheet can be improved by modifying the lamination procedure. Effectively eliminate the negative effects of deviation,
An object of the present invention is to propose an iron core having an excellent shape after lamination, together with its advantageous manufacturing method.

[0009]

That is, the present invention provides:
An amorphous iron core wherein an amorphous ribbon is wound or stacked, a side of the amorphous ribbon is partially replaced, and half of the total number of layers is stacked in an opposite direction.

Further, according to the present invention, when winding or stacking the amorphous ribbons to manufacture an iron core, the sides of the amorphous ribbons are alternately replaced during the lamination, and half of the total number of laminations are laminated in the opposite direction. A method for producing an amorphous iron core. In the present invention,
When the sides of the amorphous ribbon are alternately replaced, it is preferable to perform the replacement every several to several tens of sheets.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Generally, it is difficult to finely control the thickness of an amorphous ribbon due to its manufacturing method, and it is difficult to improve the thickness deviation more than a certain level. Therefore, if the layers are stacked as they are, the deviation is promoted, and 10
Stacking about 0 mm thick causes a deviation of several mm.
However, if the lamination can be performed so that such a thickness deviation is offset, the deviation in thickness after lamination can be eliminated.

Therefore, according to the present invention, when winding or stacking the amorphous ribbons to manufacture an iron core, the sides of the amorphous ribbons are alternately replaced in the course of lamination so that the thickness deviation is offset, and the entire lamination is performed. The above problem was solved by stacking half of the numbers in the opposite direction.

In the present invention, there are the following two methods for exchanging the sides of the amorphous ribbon. That is, a method in which the surface of the ribbon is inverted and laminated in the width direction,
In this method, the surface is left as it is and rotated 180 ° in the length direction to laminate. Both have the same effect in eliminating the thickness deviation, but for example, a surface in contact with a roll (roll surface) and a free surface (free surface), such as an amorphous ribbon produced by a single roll method. For those having different surface roughnesses, laminating by rotating them 180 ° in the length direction is more advantageous in terms of the space factor.

In the case of manufacturing an iron core from one amorphous ribbon coil, the sides may be replaced one by one. However, since the number of steps is increased, several to several tens of sheets are considered as a bundle. It is more reasonable to change the side to.
On the other hand, when manufacturing an iron core from a plurality of amorphous ribbon coils, it is possible to consider several coils as one bundle, but it is also better to consider several tens of coils as one bundle and replace the sides for each bundle. Is reasonable.

Although half of the ribbons to be laminated are considered to be one bundle, there is an effect of making the lamination thickness uniform. However, if the thickness difference is too large, lamination itself may not be performed properly. Therefore, as a guide, it is preferable to stack the bundles with a thickness difference of 0.5 mm or less on each side. Of course, the thickness of the amorphous ribbon is
No inconvenience occurs even if half of the layers are stacked in the opposite direction using a uniform material in the width direction. In the present invention,
Half does not mean strictly 50%, but 50 ± 10
% Means a range that is considered to be almost half.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG.
μm 4000 thin layers of amorphous thin ribbon having a thickness of 26 μm and a width of 170 mm on the other side were laminated on the outside of the core metal (212 mm × 92 mm × thin width, R at the corner: 3 mm). Ten sheets were made into a set, and the sheets were laminated so as to be wrapped in eight steps while being shifted by 10 mm. The eight sets of 80 sheets were made into one bundle (see FIG. 2), and each bundle was rotated by 180 ° in the length direction and laminated.

As a result, as shown in FIG. 3, a core having a uniform lamination thickness of 100 mm on both sides could be produced. The protrusion of the material in the width direction of the ribbon was within 0.5 mm. In this regard, when all of the above ribbons are stacked in the same direction, one side is 104 mm, and the other side is 96 to 1
With a lamination thickness of 00 mm, especially on the 96 to 100 mm side, a fluffy iron core was completed (see FIG. 4). In addition, try 96-100
When the mm side was pressed strongly, the lamination of the ribbon was broken.

[0018]

As described above, according to the present invention, when winding or stacking amorphous ribbons, half of the ribbons are stacked in the opposite direction, thereby offsetting the sheet thickness deviation of the material ribbon. As a result, an iron core having an excellent shape can be stably obtained without having to carefully select a material and without adding a complicated process.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an example of a cross-sectional shape in a width direction of an amorphous alloy ribbon.

FIG. 2 is a cross-sectional view showing an example of a cross-sectional shape in the width direction when 80 amorphous alloy ribbons are stacked.

FIG. 3 is a cross-sectional view showing an example of a cross-sectional shape in the width direction when 4,000 sheets of amorphous alloy ribbons are replaced with each other and the sides are replaced every 80 sheets.

FIG. 4 is a cross-sectional view showing an example of a cross-sectional shape in the width direction when 4000 sheets are stacked without replacing the sides of the amorphous alloy ribbon.

Claims (3)

[Claims] 1. An amorphous iron core wherein an amorphous ribbon is wound or stacked, and the side of the amorphous ribbon is partially replaced, and half of the total number of layers is laminated in an opposite direction. 2. A method of manufacturing an iron core by winding or stacking an amorphous ribbon, wherein the sides of the amorphous ribbon are alternately replaced in the course of lamination, and half of the total number of laminations are laminated in the opposite direction. Manufacturing method of amorphous iron core. 3. The method for manufacturing an amorphous iron core according to claim 2, wherein the replacement of the amorphous ribbon side is performed every several to several tens of sheets.