JP2005072161A - Amorphous winding core transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a magnetic characteristic of an iron core by changing a lapping method in an outer iron core among amorphous wound iron cores having a three-phase tripod-wound iron core structure, and to reduce a man-hour for lapping work.
SOLUTION: A three-phase structure comprising two inner iron cores 2 in which one of leg portions inserted into interlinked coils 1 is arranged adjacent to each other and an outer iron core 3 surrounding the outer periphery of these inner iron cores 2. It has a tripod-wound iron core structure, and the wound iron core is formed in a rectangular shape by laminating amorphous magnetic ribbons so as to have a pair of legs, a pair of yokes, and a window surrounded by these legs and yokes. In the amorphous wound iron core transformer, the outer iron core 3 has a lap joint portion over the entire linear portion of the yoke portion.
[Selection] Figure 3

Description

  The present invention relates to an amorphous wound core transformer, and more particularly to a wound core transformer having a wound core using an amorphous magnetic ribbon (referred to herein as an “amorphous wound core”).

  An amorphous wound core having a three-phase tripod wound core structure is manufactured by winding a laminated amorphous magnetic ribbon around a coil and wrapping both ends thereof. Amorphous wound cores with a three-phase tripod wound core structure manufactured in this way are known.

An amorphous wound iron core is manufactured by winding a laminated amorphous magnetic ribbon around a coil, and wrapping both ends of each other butted or overlapped. As a result, the flow of the magnetic flux is disturbed at the lap joint formed thereby, and the magnetic characteristics of the iron core tend to deteriorate. Therefore, there is a need for a lapping method that can improve the magnetic characteristics of the iron core by making the flow of magnetic flux as smooth as possible at the lap joint. Among the cores of the conventional three-phase tripod-wrapped core structure, the method of wrapping at the outer core has the possibility of disturbing the flow of magnetic flux because the lap joint is concentrated near the center of the outer core yoke. . Therefore, it has been proposed to devise a lap joint (see Patent Documents 1 and 2).
JP-A-7-86052 JP-A-7-249537

  Therefore, the present invention is to provide an amorphous wound core transformer having a three-phase tripod wound core structure using a lapping method that does not deteriorate the magnetic characteristics of the iron core in the outer wound iron core.

  In order to solve the above-mentioned problems, in the present invention, the flow of magnetic flux is improved by spreading and dispersing the lap joints in the outer core of the three-phase tripod-wound amorphous core in the outer core over the entire area of the outer core straight line. There is to make it.

  That is, the present invention provides a three-phase tripod winding comprising two inner iron cores, one of which is adjacent to one another inserted into interlinked coils, and an outer iron core surrounding the outer periphery of these inner iron cores. It has an iron core structure, and the wound iron core is formed in a rectangular shape by laminating amorphous magnetic ribbons so as to have a pair of leg portions, a pair of yoke portions, and a window portion surrounded by the leg portions and the yoke portion. In the amorphous wound iron core transformer, the outer iron core is an amorphous wound iron core transformer having a lap joint portion over the entire linear portion of the yoke portion.

  In the present invention, the outer core is an amorphous wound core transformer formed of an amorphous magnetic ribbon made of one unit.

  The present invention is the amorphous wound core transformer in which the lap joint of the outer iron core is in contact with the lap joint of the inner iron core.

  Furthermore, the present invention is the amorphous wound core transformer in which the lap joint portion of the outer core is formed by step lap joint or overlap joint.

  According to the present invention, in the amorphous core, the wrapping method is distributed over the entire area of the outer core yoke linear portion in the outer core of the three-phase tripod core, thereby improving the magnetic properties of the core and reducing the number of lap work steps. be able to.

The best mode for carrying out the present invention will be described.
Hereinafter, embodiments of the amorphous wound core transformer of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory front view of a three-phase tripod-wrapped iron core structure. FIG. 2 is an explanatory diagram of an outer core wrapping method in a conventional three-phase tripod wound core structure. FIG. 3 is an explanatory diagram of an outer core wrapping method in the three-phase tripod wound core structure of the first embodiment. FIG. 4 is an explanatory diagram of an outer core wrapping method in the three-phase tripod wound core structure of the second embodiment. FIG. 5 is an explanatory diagram of an outer core wrapping method in the three-phase tripod wound core structure of the third embodiment. FIG. 6 is a detailed explanatory view of step lap joining. FIG. 7 is a detailed explanatory view of overlap bonding.

  Example 1 will be described. FIG. 1 is an assembly diagram of wound cores and coils in a three-phase tripod wound core structure. As shown in the example of the conventional lapping method of FIG. 2, the lapping method in the outer iron core 3a of the wound iron core of FIG. 1 is concentrated in the vicinity of the center of the outer iron core yoke portion. There is a possibility that leakage of magnetic flux generated from the part 5a disturbs the flow of the surrounding magnetic flux. Therefore, in the present invention, the leakage of magnetic flux is dispersed by forming the outer core 3b by the wrap method in which the lap joint 5b is dispersed over the entire yoke linear portion of the outer core 3b as in the embodiment shown in FIG. It smoothes the flow of magnetic flux and improves the magnetic properties of the iron core. In addition, the number of blocks of the amorphous magnetic ribbon in one unit increases with the dispersion of the lap joints over the entire yoke linear part, and the number of laps can be reduced and the number of work steps can be reduced.

  A second embodiment will be described. In this embodiment, as shown in FIG. 4, the outer iron core 3c is a wrapping method in which the lap joint 5c is dispersed over the entire area of the yoke linear portion, and the wound core is formed by only one unit of amorphous magnetic ribbon. It is. In this case, since only one unit of amorphous magnetic ribbon is formed, only one lap is required. Therefore, the magnetic characteristics of the iron core can be improved, and at the same time, the number of lap work steps can be significantly reduced.

  A third embodiment will be described. In the present embodiment, as shown in FIG. 5, the lap joint portion of the outer iron core 3d is pressed by the lower portion of the inner iron core 2, and the lap joint portion 5d of the outer iron core 3d is extended to the entire area of the yoke linear portion. It is formed by the lapping method. In the conventional case, the lap joint is located at the center of the yoke part and becomes the lower part of the triangular window 6 formed by the three-phase tripod wound core structure. It was a stable cause of bending and adversely affected the magnetic properties. Therefore, by setting the lap joint 5d to a position below the two inner iron cores 2, the lap joint 5d is pressed by the inner iron core 2 and is in a stable state. At the same time, the magnetic properties can be improved by extending the lap joint 5d of the outer iron core 3d to the entire area of the yoke straight portion.

  In addition, as an example of the lap joining method in these embodiments, step lap joining in which amorphous magnetic ribbons are joined by butt bonding as shown in FIG. 6 or overlapping with a joining portion of amorphous magnetic ribbons as shown in FIG. Overlapping joint etc. that have In the case of step lap joining, the magnetic flux flow 7a is shifted to the adjacent block once at the butt portion of the amorphous magnetic ribbon and returns to the original block again. In the case of overlap joining, the magnetic flux flow 7b is the other flow. Therefore, the flow of the magnetic flux in the overlap joint is smoother than that in the step lap joint, and the magnetic characteristics are improved.

Front explanatory drawing of a three-phase tripod-wrapped iron core structure. Explanatory drawing of the outer core wrap method in the three-phase tripod winding core structure of a prior art example. Explanatory drawing of the outer core wrap method in the three-phase tripod winding core structure of Example 1. FIG. Explanatory drawing of the outer core wrap method in the three-phase tripod winding core structure of Example 2. FIG. Explanatory drawing of the outer core wrap method in the three-phase tripod winding core structure of Example 3. FIG. Detailed explanatory drawing of step lap joining. Detailed explanatory drawing of overlap joining.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Coil 2 Inner core 3a, 3b, 3c, 3d Outer core 4 Outer core yoke linear part 5a, 5b, 5c, 5d Lap joint part 6 Triangular window 7a, 7b Flow of magnetic flux

Claims (4)

It has a three-phase tripod wound core structure composed of two inner iron cores that are arranged adjacent to each other and inserted into interlinked coils, and an outer iron core that surrounds the outer periphery of these inner iron cores. The wound core has an amorphous wound core transformer formed into a rectangular shape by laminating amorphous magnetic ribbons so as to have a pair of leg portions, a pair of yoke portions, and a window portion surrounded by the leg portions and the yoke portion. In
The outer core is an amorphous wound core transformer characterized in that the outer core has lap joints throughout the straight portion of the yoke. In the amorphous wound core transformer according to claim 1,
The outer core is formed of an amorphous magnetic ribbon made of one unit. In the amorphous wound core transformer according to claim 1,
An amorphous wound core transformer, wherein the lap joint of the outer iron core is in contact with the lap joint of the inner iron core. In the amorphous wound core transformer according to any one of claims 1 to 3,
The amorphous wound core transformer characterized in that the lap joint portion of the outer iron core is formed by step lap joint or overlap joint.

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