JPS58150206A - Dislocated wire for induction device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] -1- [Technical Field of the Invention] The present invention relates to a transposed electric wire for induction electric appliances used in induction electric appliances such as large-capacity transformers and accelerators. , which is constructed by bundling a plurality of cable lines.

[Technical Background of the Invention] Generally, as shown in Fig. 1, a conductor 1 placed in a magnetic field with a magnetic flux density of 11 JtB = (f3a, Bx) generated by alternating current has a conductor width perpendicular to the direction of the magnetic field. (T and W
An eddy current proportional to the square of the product of (Ba-T)2+ (Bx-W)2 is generated perpendicular to the magnetic field.

Therefore, in order to reduce the loss caused by this eddy current, transposed electric wire 3, which is made by bundling and twisting a plurality of wires 2 as shown in Fig. 2, has traditionally been used as a winding wire for large-capacity induction electric devices. has been done. This strand 2 has a rectangular cross section with a small longitudinal width W and a lateral width T, and its surface is insulated with an insulating coating 4 such as formal to prevent the generation of eddy current. The cutting of the cross-sectional area in step 2 is set so that the cutting area of the transposed electric wire 3 necessary for energization is as large as possible. On the other hand, the entire circumference of the transposed electric wire 3 is covered with an insulating jacket 5 to insulate it from other transposed electric wires.

In addition, in this transposed electric wire 3, only one strand 2 is arranged on one side end surface of the cross section, but this is because the transposed electric wire 3
This is because the position of the strands changes one after another in the same direction as the rotational direction of the strands according to the twisting of the strands 5 and 2 of the strands. A dead space 6 exists between them.

1. Problems with the Back Song Technology However, as shown in Fig. 2, this conventional transposed electric wire has two rows of strands 2, so if the hood current is to be further reduced, the horizontal width t and the vertical By reducing the width W further, the third
As shown in the figure, the entire structure is made thinner. However, using 1- in this manner has the disadvantage that when the winding is constructed, the space factor is not deteriorated.

That is, by reducing the vertical width W of the strands 2, the outer shape of the winding can be reduced by reducing the vertical width W of the wire 2. If they are made the same, each disc will be thin and arranged in multiple stages, and the number of oil passages 8 between each disc winding 7 will increase, as shown in FIG. The proportion of the wire volume increased, and the space factor of the winding decreased.

Furthermore, the wires forming one transposed wire may be twisted in three rows or four rows in one row rather than in two rows as described above. However, in that case, there is a problem that the number of strands is extremely large, and manufacturing the transposed electric wire 13 by twisting this large number of strands at once exceeds the capacity of the machine tool for manufacturing the strands. there were.

[Object of the invention] The object of the invention is to improve the vertical width W and the horizontal width (
An object of the present invention is to provide a transposed electric wire for induction electricity that can be manufactured using conventional machine tools while ensuring the necessary cross-sectional area and space factor by using wires having a sufficiently small size.

[Summary of the Invention] −4= The transposed electric wire for induction electricity of the present invention has two or more strands of wires in advance.
It is made by stacking unit transposition electric wires twisted together in multiple rows in multiple stages in the horizontal direction, and applying an insulating jacket around the outer periphery.

[Embodiment of the Invention] An embodiment of the present invention will be described with reference to FIGS. 5 and 6. Note that the same parts as those of the conventional type are given the same numbers and the explanation will be omitted.

In FIG. 5, the upper two rows of strands and the lower two rows of strands are individually manufactured unit transposition wires 23.)
The unit transposed electric wires 23 are stacked vertically and integrated to form one transposed electric wire 33.

That is, the unit transposition electric wire 23 is formed by twisting together a large number of strands 2 having the same horizontal width (and vertical width W) as the conventional transposition electric wire, and the outer periphery of the unit transposition electric wire 23 is not coated with an insulating jacket. These strands 2 have a non-adhesive insulating coating 4 made of formal or the like, on which a thermosetting resin is applied in a semi-cured state, and then baked for one time, and then By simultaneously heat curing this resin while avoiding drying of the induction wire winding body, the unit transposition electric wire 23 is firmly integrated.
is formed.

And the unit transposition electric wire 2 integrated in this way
3 are stacked in two layers, top and bottom, and outer insulation paper etc.
The transposed electric wire 3 of this embodiment is provided with an insulating jacket 5 consisting of
3 is formed.

Therefore, if a coil is formed in a coil volume having the same radius as in the conventional case using the transposed electric wire of this embodiment, the result will be as shown in FIG. 6, and the number of transposed electric wires forming each disk 7 can be increased. As a result of (a), the ratio of oil passages 8 between each disc 7 becomes relatively small.

The operation and effect of the transposed electric wire 33 of this embodiment having such a configuration will be explained in comparison with the conventional transposed electric wire shown in FIG. 2 or 3. However, Fig. 2, Fig. 3, Fig. 5
In the figures, the cross-sectional areas of the transposed wires necessary for energization are the same, and the rectangular cross-sectional dimensions of the strands 2.12 are ``r=2t, W-2w'' in each figure.

-6= First, a comparison will be made between the transposed electric wire of this embodiment shown in FIG. 5 and the conventional type shown in FIG. 2.

The transposed electric wire of this example has a vertical width W and a horizontal width (both of which are 1/2), so the eddy current is reduced to 1/4. (In terms of meaning, only 1/4 of the eddy current is generated in the case of the conventional type, and the overall eddy current 1 (1) is also 1/4 of that in the case of the conventional type.On the other hand, regarding the space factor, As the number of cable wires increases, the proportion occupied by the insulating coating 4 of each cable wire increases, but since the dead space 6 decreases due to the segmentation of the wires, the space factor remains the same.

Next, when comparing the transposed electric wire of this embodiment with the conventional transposed electric wire shown in FIG. 3, the dimensions of the constituent wires are the same, and there is no difference in eddy current loss. However, when these transposed electric wires are used for disk windings, compared to the case of the conventional transposed electric wire 13 with many oil passages 8 as shown in FIG. The proportion of the oil passages 8 between the windings 7 in the cross-sectional area of the entire winding becomes small, and the space factor is sufficiently improved.

-71 Since the present invention is constructed by stacking the unit transposition electric wires 23 in a plurality of upper and lower stages, the strands forming the unit transposition electric wire in the upper stage are the strands forming the unit transposition electric wire in the lower stage. It is desirable that some measure be taken to prevent this from happening. In this embodiment, the upper and lower unit transposed electric wires 23 are each integrated with a thermosetting resin, so there is no problem of biting. If not, as shown in FIG. 7, an insulating sheet 11 is interposed between the upper and lower unit transposed electric wires 23 to prevent biting.

These insulation sheets 1 to 11 may be non-adhesive insulation sheets such as kraft paper, but they are impregnated with thermosetting resin,
The winding body of the induction electric device may be simultaneously heated while avoiding drying, and the upper and lower unit transposed electric wires 23 may be bonded together.

Furthermore, as a means of integrating the individual wires constituting the unit transposition electric wire 23, it is also possible to provide an insulating jacket 12 on each of the upper and lower unit transposition electric wires, as shown in FIG. . Providing this insulating jacket 12 is effective in preventing the wires 2 of the upper and lower unit transposition wires 23 from being bitten when the width t of the wires 2 becomes extremely small. Furthermore, each strand 2 can be held in close contact with each other. In addition, when each unit transposition electric wire 23 is provided with the insulating jacket 12, the entire insulating jacket 5 can be made thinner, and there is no fear that the space factor will decrease.

Furthermore, although the embodiment shown in each figure is composed of unit transposed electric wires 23 in two lower stages, the present invention is not necessarily limited to this, and the present invention is not limited to this, but can be constructed by three or more stages of unit transposed electric wires. However, the number of strands constituting the transposed electric wire is not limited to that shown in the drawings.

[Effects of the Invention] As described above, according to the transposed electric wire for induction electric appliances of the present invention, the cross-sectional area of the strands can be made smaller to further suppress the generation of eddy current, and the transposed electric wire as a whole can be made thinner. This has the effect of maintaining the space factor of the windings at a high level without causing the windings to deteriorate.

-9-

[Brief explanation of drawings]

Figure 1 is a diagram showing the relationship between magnetic flux density and conductor width, Figures 2 and 3 are cross-sectional views of conventional transposed wires, and Figure 4 is a diagram showing the relationship between magnetic flux density and conductor width. Cross-sectional view of disk winding, No. 5
The figure is a sectional view showing an embodiment of the transposed electric wire of the present invention, FIG. 6 is a sectional view of a disk winding using the transposed electric wire of FIG. FIG. DESCRIPTION OF SYMBOLS 1... Conductor, 2... Element wire, 3.13... Rolling wire◇ Electric wire, 4... Insulating coating, 5.12... Insulating jacket, 6...
...Dead space, 7...Disk of disk winding, 8...
- Oil pipe, 11... Insulation seam I~, 23... Unit transposed electric wire, 33... J: transposed electric wire according to the present invention. 7311 Representative Patent Attorney Kensuke Norichika (and 1 other person) -10- Figure 5 Figure 8

Claims (2)

[Claims] (1) An induction device characterized in that a plurality of unit transposition electric wires formed by twisting together a plurality of wires insulated by an insulating coating are stacked in multiple stages in the vertical direction, and the outer periphery of the unit transposed electric wire is covered with an insulating jacket. Transposed electric wire for electrical appliances. (2) The transposed electric wire for an induction electric appliance according to claim 1, wherein the unit transposed electric wire is not provided with an insulating jacket on its outer periphery. (3) The transposed electric wire for an induction electric appliance according to claim 1, wherein the unit transposed electric wire has an insulating jacket on its outer periphery. (4) The transposed electric wire for an induction electric appliance according to claim 1, wherein the unit transposed electric wires are integrated by a thermosetting resin coated on the insulating coating of each element wire.