JPH0121612B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a three-phase wound core, and is particularly suitable for use in a cut-wound core.

The conventional three-phase wound core shown in FIG. 1 consists of a pair of inner wound cores 1 and 2 whose legs are adjacent to each other, and an outer wound core 3 that fits around the outer periphery of the inner wound cores 1 and 2. At this time, the inner-wound cores 1 and 2 and the outer-wound core 3 are formed by winding and overlapping a large number of silicon steel plates each cut into a predetermined size for one circumference. Therefore, in order to attach the winding 4 to such a three-phase wound core, the entire three-phase wound core is first annealed.
Thereafter, the wrap portions A, B, and C, where both ends of the silicon steel plates forming the inner-wound cores 1, 2 and the outer-wound core 3 are concentrated, are opened, and the windings 4 are attached. All you have to do is close the wrap parts A, B, and C.

However, in this prior art, even if an attempt was made to close each of the wound cores 1, 2, and 3 after the winding 4 was attached, it was not possible to close them easily. This is because, as shown in Fig. 2, for example, the outer wound core 3
This is because when closing the wrap portion C, both ends of the wrap portion C tend to open because the corner portions 3a are not aligned.
This situation also occurred in the inner wound cores 1 and 2. At this time, since the upper yoke of the outer-wound core 3 is long, the influence of the mismatch of the corner portions 3a increases, and as a result, the force (repulsive force) that tries to open the wrap C in the outer-wound core 3 becomes large, causing a problem. It was hot.

SUMMARY OF THE INVENTION In view of the above-mentioned prior art, an object of the present invention is to provide a three-phase wound core that can be particularly easily closed after the windings are attached. The structure of the present invention that achieves the above object includes winding a large number of silicon steel plates in a three-phase wound core in which an outer wound core is fitted around the outer periphery of a pair of inner wound cores whose legs are in contact with each other. The outer-wound core is formed by laminating a plurality of layers formed by rotating the steel sheets, and the positions of the lap portions of the layers where both ends of the silicon steel plates are concentrated are shifted from each other.

Embodiments of the present invention will be described in detail below based on the drawings. Note that parts that are the same as those in the prior art are given the same numbers and redundant explanations will be omitted.

FIG. 3 shows an embodiment of the invention. As shown in the figure, in this embodiment, the outer wound core 5 is composed of two layers, an outer layer 5a and an inner layer 5b, and the lap portion of the outer layer 5a is further extracted and shown in enlarged view in FIG.
The position of D ₁ and the lap portion D ₂ of the inner layer 5b, which is extracted and enlarged in FIG. 5, are misaligned. Therefore, the repulsive force at the wrap portion _D2 is suppressed by the flat portion of the outer layer 5a. Furthermore, since the positions of both wrap portions are shifted, the repulsive force is dispersed, and as a result, the repulsive force is weakened overall.

In order to shift the positions of the lap parts _D1 and _D2 , (a) As shown in FIG. 6, first stack the outer layer 5a and the inner layer 5b so that the lap parts _D1 and _D2 are aligned. (see Fig. 6a), and then separate the outer layer 5a and the inner layer 5b before installing the winding and remove the outer layer 5.
(a) may be reversed (see Fig. 6b), and finally the reversed outer layer 5a and inner layer 5b may be combined, or (b) the silicon steel plate may be wound and overlapped so that there are two lap parts. Accordingly, an outer wound core 5 may be manufactured in which the positions of the wrap portions D ₁ and D ₂ are shifted from the beginning.

Furthermore, in the above embodiment, the outer wound core 5
Although the structure is made of two layers, it goes without saying that it may be made of three or more layers and the positions of the cut portions of each layer may be shifted from each other.

As specifically explained above in conjunction with the embodiments, according to the present invention, since the repulsive force at the wrap portion is reduced, it is possible to easily close the outer wound core after installing the winding.

[Brief explanation of drawings]

Figure 1 is a front view showing a conventional three-phase wound core;
The figure is an explanatory diagram showing how the outer wound core opens, FIG. 3 is a front view showing an embodiment of the present invention, and FIGS. The enlarged front view and FIGS. 6a to 6c are explanatory diagrams for explaining one method of manufacturing the outer wound core of this embodiment. In the drawing, 1 and 2 are inner-wound cores, 3 and 5 are outer-wound cores, 5a is an outer layer, 5b is an inner layer, A, B, C,
D ₁ and D ₂ are lap parts.

Claims (1)

[Claims] 1 In a three-phase wound core formed by fitting an outer wound core to the outer periphery of a pair of inner wound cores whose legs are in contact with each other, a plurality of layers formed by winding a large number of silicon steel plates are laminated. A three-phase wound core characterized in that the outer wound core is formed and the positions of the lap portions of each layer where both ends of the silicon steel plate are concentrated are shifted from each other.