JPS60214516A - Manufacturing method of wound iron core - Google Patents

Abstract

PURPOSE:To obtain a wound iron core which is excellent in magnetic characteristics and in assembly works and is low cost in manufacture by assembling alternately turning round from left to right and vice versa the cutting position and the direction of a leg after winding a silicon steel belt spirally. CONSTITUTION:A silicon steel belt 1 is spirally wound and made to nearly a rectangular shape. Then, the center of a left leg 2A is cut aslant from the inside to the outside. A right leg 2B is also cut aslant from the outside to the inside in parallel with the above-mentioned section 9 and two iron core members 8, 8 are separated. Then, each layer of both the iron core members 8, 8 is turned round from left to right and vice versa and is inserted into a coil 4 to be assembled integrally. As a result, the joint surface of each layer is shifted in an X shape at the center of both the right and left legs 2A, 2B and is placed between the adjacent layers, i.e., a lap joint and a magnetic route is not cut and the magnetic characteristics are improved in comparison with a butt joint.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a wound core used in a transformer, and particularly to an improvement in the bonding structure of each layer.

As shown in Fig. 1, a wound core generally used in a transformer is made by spirally winding a silicon steel core 1 to form a substantially rectangular shape, and then axially extending the center of the left and right legs 2A, 2B. Cut along. Next, after polishing this cut surface smoothly, a coil 4.4 was inserted, and the cut surface was bonded and butt-jointed so that the joint surface 3.3 became planar, thereby forming an integral wound core 5.

However, the wound core 5 manufactured by this method has both leg portions 2A.
, 2B is cut and the cut surfaces are polished before being assembled, resulting in poor workability.Moreover, since the joint surfaces and 3 are butt joints, gaps are likely to occur, blocking the flow of magnetic flux and resulting in poor magnetic properties. There were drawbacks.

In order to improve the problems caused by such butt joints, the second
A stacked structure as shown in the figure has also been proposed in the past. As shown in Figure 3, these silicon steel strips have different lengths.
A plurality of sheets are stacked on top of each other with their ends shifted, and this is set in a lower mold 6A having the same shape as the winding mold. In this state, the upper mold 6B having an inverted U shape is pressed by the cylinder 7 to be press-molded, and as shown in FIG. . This iron core member 8.8 is made into a two-component mold, the coil 4 is inserted and assembled, and the end side surfaces of the joint surfaces 3 are overlapped in a stepped manner as shown in FIG.
This is a method of making a joint.

However, although this structure improves the magnetic properties, it requires cutting the silicon steel strips 1 accurately to predetermined dimensions and laminating them at precisely shifted positions, which is extremely difficult to work with. In particular, for those with a large winding diameter, multiple press molds must be prepared, which has the disadvantage of increasing manufacturing costs.

The present invention eliminates the above-mentioned drawbacks, and provides a method for manufacturing a wound core that is easy to assemble, can be manufactured at low cost, and has excellent magnetic properties.

An embodiment of the present invention will be described in detail below with reference to the drawings.

5 and 6 show an embodiment of the present invention.

First, as shown in FIG. 5 (AI), a silicon steel strip 1 is spirally wound around a winding form (not shown) to form a substantially rectangular shape.

Next, as shown in FIG. 3B, the left leg portion 2A in the figure is cut diagonally from the inside to the outside at the center. Also right leg 2B
The core members 8.8 are also cut obliquely from the outside toward the inside parallel to the cut surface 9 to separate them into two core members 8.8. Next, the same figure (
As shown in C), each of the core members 8 and 8 is reversed left and right one layer at a time, and inserted into the coil 4 to be combined into one piece. When this state is enlarged, as shown in FIG.
are shifted in an x-shape, resulting in an overlapping joint sandwiched between adjacent layers.

Therefore, since it is an overlapping joint, the magnetic path is not blocked compared to a butt joint (・), and the magnetic properties are improved. Furthermore, since it is first rolled, then cut, and then assembled, a press mold is not required. Moreover, work efficiency can be greatly improved.

7 and 8 show other embodiments of the present invention, which are the same until the silicon steel strip 1 is rolled into a rectangular shape as shown in FIG. 7(A). Next, as shown in FIG. 2B, the center portions of both the left and right leg portions 2A, 2B are cut parallel to each other at an angle with respect to the axial direction to separate them into two iron core members 8.8. Thereafter, each layer of both iron core members 8.8 is left and right reversed layer by layer, and the coil 4 is inserted and assembled together. When viewed from the side, the joint surfaces 3 of the legs 2A, 2B have an X-shape, and when viewed from the front, they are lined up and down horizontally, one layer at a time, as shown in FIG. 8.

Furthermore, FIG. 9 shows another different embodiment, and FIG.
After winding into a nearly rectangular shape as shown in A"l,
), the two left and right legs 2B are cut parallel to each other along the axial direction at different levels to separate them into two iron core members 8.8. Next, as shown in FIG. 4C, each layer of both iron core members 8 and H is reversed horizontally and inserted into the coil 4.4, and then combined and joined together. In this state, as shown in FIG. 10, when viewed from the front, the bonding surfaces 3 are arranged one layer at a time one above the other, and are overlapped by the adjacent layers.

In the above-mentioned embodiments, the case where each layer is left and right reversed and combined is shown, but it is also possible to combine a plurality of layers and alternately reverse each layer and combine them.

(5) As explained above, according to the present invention, since the silicon steel strip is wound in a spiral shape using a winding die, a press die is not required, and furthermore, once the silicon steel strip is wound, By alternating the cutting positions and directions and assembling them while alternating left and right reversals, it is possible to perform overlapping bonding with excellent magnetic properties, and to obtain a rolled iron core @ manufacturing method with excellent assembly workability and low manufacturing costs. It is something that can be done.

[Brief explanation of the drawing]

Figure 1 is a front view of a conventional wound core that is butt-jointed, Figure 2 is a front view of a conventional wound core that is overlapped and joined together in a stepped manner, and Figures 3 and 4 are the front view of the wound core of Figure 2. 5(A) to 5(C) are perspective views showing the process of manufacturing a wound core according to an embodiment of the present invention, and FIG. ), FIGS. 7(A) to 7(C) are perspective views showing the process of manufacturing a seam-wound core according to another embodiment of the present invention, and FIG. 8 is an enlarged front view showing the center of the leg of FIG. 7(C) is an enlarged front view showing the center of the leg, and FIGS. 9(A) to 9(C) show a 9-wound iron core according to another embodiment of the present invention (6). FIG. 10 is an enlarged front view showing the center of the leg of FIG.・・・
Joint surface 4...Coil 5...Wound core 6A...Bottom mold 6B...Bottom mold Z...Core member 9...Cut surface Applicant Agent (7)

Claims (1)

[Claims] After winding the silicon steel strip into a spiral shape, the left and right legs are cut diagonally or in different steps, parallel to each other, and each layer after cutting is turned left and right one or more times and integrated. A method for manufacturing a wound iron core characterized by combining the layers, and superimposing and joining the cut parts of each layer.