JPH0340486B2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a coil.

Conventionally, there have been coils formed by forming a flexible insulating film into a cylindrical shape on which many conductive paths are printed in parallel (for example, in Japanese Patent Application Laid-Open No. 54-106859).
(No. 56-38414).

However, due to the processing of the relationship between the thickness and width of the conductive path, only a conductive path with (thickness/width)≦1 can be obtained, which limits the number of turns per circuit. Furthermore, since the distance between adjacent conductive paths is approximately equal to the thickness of the conductive paths, there is a drawback that high-density conductive paths cannot be formed.

In contrast, a conventional method for manufacturing a coil that can increase the number of turns per circuit and form high-density conductive paths will be described with reference to FIGS. 1 to 7. That is, first of all, Fig. 1 and Fig. 2
As shown in the figure, a wire sheet 3 is formed by covering n wires 1 in parallel with an insulating member 2, and the wire sheet 3 is placed between the sheet side end surfaces 3a as shown in FIG. The coil is spirally wound by T turns so as not to create a gap, and both ends are cut in a direction perpendicular to the cylinder axis to form the coil inner cylinder 4 shown in FIG. 4.
Next, the coil outer cylinder 5 shown in FIG. 5, which has an inner diameter that fits snugly into the outer diameter of the coil inner cylinder 4, is formed in the same manner as described above, with the direction of the spiral reversed. Thereafter, as shown in FIG. 6, the inner coil cylinder 4 is fitted into the outer coil cylinder 5, and the jumper wire 6 is connected to the opposing strands 1 of the inner and outer coil cylinders 4, 5.
7 and welded by laser beam 8.
In this case, the coil inner cylinder 4 and the coil outer cylinder 5
By setting in advance so that the opposing strands 1 and 7 at one end face each other at a position shifted laterally by one length at the other end, each of the opposing strands 1 and 7 welded to each opposing strand 1 and 7 is Both wire sheets 3 and 9 with jumper wire 6...
The strands 1 and 7 are electrically connected to form one loop circuit, thereby forming a coil 10 having a number of turns of 2×n×t turns. That is, FIG. 7 is a developed view of the coil 10 of FIG. 6 cut in the axial direction, and the solid lines indicate the strands 1 in the coil inner cylinder 4,
The broken line indicates the wire 7 inside the coil outer cylinder 5, and as shown in the figure, one loop electric path is formed in the order of A→B→C→D→E→F.

However, since a considerably high voltage is generally applied between both terminals of such a coil 10, the voltage between the side end surfaces 3a and 9a of each strand sheet 3 and 9 is
Also, there was a problem that dielectric breakdown occurred between the two wire sheets 3 and 9.

Therefore, an object of the present invention is to provide a coil with high insulation performance.

An embodiment of the present invention will be described with reference to FIGS. 8 to 10. That is, this coil 11 is
As shown in FIG. 8 (a half-sectional view of the coil 11 cut along the plane including the axis), an insulator 14 is inserted between the side end surfaces of the wire sheet 13 that constitutes the coil inner cylinder 12.
At the same time, an insulator 17 is also interposed between the side end surfaces of the wire sheet 16 constituting the outer coil cylinder 15, and a cylindrical insulating layer 18 is also interposed between the inner and outer cylinders 12 and 15 of both the coils. There is.

As shown in FIG. 9, the manufacturing method is to wrap the insulator 14 around the core bar 15 in a spiral shape by t turns with the insulator 14 attached to one end face of the wire sheet 13. The coil inner cylinder 12 is bonded between both end surfaces of the wire sheet 13 and cut at both ends in a direction perpendicular to the cylinder axis direction.
form. A coil outer cylinder 15 having a spiral direction opposite to that of the coil inner cylinder 12 is formed in a similar manner. Next, the inner coil cylinder 12 is fitted into the outer coil cylinder 15 with the cylindrical insulating layer 18 interposed therebetween. In this case, the opposing strands 13a and 16a at one end of the coil inner cylinder 12 and the coil outer cylinder 15 are
The other end is fitted so as to be opposed to the position shifted to the side by one length. Finally, both coil inner and outer cylinders 12,
Each opposing strand 13a, 16a on both end faces of 15
By bridging jumper wire rods (not shown) between and 13b and 16b and welding and fixing them with a laser beam, each jumper wire rod electrically connects each strand 13c and 16c of both strand sheets 13 and 16 to form a single wire. Form a loop circuit. In this case, as shown in FIG. 10, the ends 13d of both the wire sheets 13 and 15 are bent in the axial direction of the cylinder so as to be spaced apart from each other, and the jumper wires are welded to the end surfaces 13a and 16a. Therefore, when the winding angle of the wire sheet 13 is θ and the width of each wire 13c is W, the arrangement pitch L of the end portion 13d of each wire 13c is W/sinθ.

In this way, the insulator 14 is interposed between the side end faces of the wire sheet 13 that constitutes the coil inner cylinder 12, and the insulator 17 is also interposed between the side end faces of the wire sheet 16 that constitutes the coil outer cylinder 15. Furthermore, since the cylindrical insulating layer 18 was interposed between the inner and outer cylinders 12 and 15 of both coils, each strand sheet 13 and 1
The dielectric strength between 3 and 16, 16 and 13, and 16 increases, and even when a high voltage is applied to both ends of the coil 11, there is almost no risk of dielectric breakdown occurring inside the coil 11. Moreover, both strand sheets 13 and 16 have ends 1 of each strand 13c and 16c.
3d are bent in the direction of the cylinder axis and placed in parallel and separated from each other, so that the ends 13d of each strand 13c, 16c
The arrangement pitch L increases by 1/sinθ times the width W of each strand, which means that the distance between adjacent welding points when welding jumper wire increases, making welding work easier and more reliable. .

Note that the coil 11 can be manufactured by other methods. That is, an insulator 14 is provided on one end surface.
The wire sheet 13 to which is pasted is wound in a spiral shape, and a cylindrical insulating layer 18 is laminated and adhered to the outer peripheral surface of the wire sheet 13.
Further, on the outer circumferential surface of the cylindrical insulating layer 18, another wire sheet 1 having an insulating material 17 adhered to one side end surface.
6 is spirally wound in the opposite direction to the strand sheet 13, both ends of which are bent in the direction of the cylinder axis and cut in a direction perpendicular to the cylinder axis, so that each opposing strand 13a appears on both cut end faces. , 16a and 13
By welding jumper wire rods (not shown) to b and 16b, each wire strand 13c and 16c and each jumper wire rod form one loop electric path to obtain the coil 11.

As described above, the coil of the present invention consists of a first wire sheet in which a large number of wires are arranged in parallel in an insulated state, and a first insulator is interposed on the side end surface of the wire sheet in a spiral shape. A coil inner cylinder in which the wire is wound and both ends of the wire are extended in the direction of the cylinder axis, a cylindrical insulating layer laminated on the outer peripheral surface of the coil inner cylinder, and a laminated covering on the outer peripheral surface of the cylindrical insulating layer. A second wire sheet having the same structure as the first wire sheet is placed in a direction opposite to the first insulating sheet so that a second insulator is interposed on the side end surface of the second wire sheet. a coil outer cylinder that is spirally wound and has the same length as the inner coil cylinder and both ends of the strand extending in the cylinder axis direction; and opposing strands on both end surfaces of the inner coil cylinder and the outer coil cylinder. Since a large number of jumper wires are provided in which one loop electric path is formed between the coil inner cylinder and the coil outer cylinder by bridging the gaps between them, the following effects can be obtained.

That is, one coil is formed by connecting each wire of the coil inner cylinder and coil outer cylinder with a jumper wire, and the first insulator, the second insulator, and the cylindrical insulator It is possible to reliably prevent dielectric breakdown between the respective side end surfaces of the stranded wire sheet and the second stranded wire sheet, and between the first stranded wire sheet and the second stranded wire sheet, and also prevent the inner coil cylinder and the coil outer cylinder. Since both ends of the wire are extended in the direction of the cylinder axis, the distance between adjacent wires in the circumferential direction becomes larger, ensuring mutual insulation, and jumper wires are attached to the wires in the inner and outer cylinders of the coil. When connecting, it is possible to secure a distance between circumferentially adjacent connection points, making the connection work easier and more reliable. Moreover, since the (thickness/width) of the strands of the first strand sheet and the second strand sheet can be freely set, the number of turns per turn can be increased compared to the conventional example. Since the spacing between the wires can be made narrower than the thickness of the strands, it is possible to form conductive paths with higher density than in the conventional example.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the main part of the wire sheet, Fig. 2 is an enlarged sectional view thereof, Fig. 3 is a perspective view showing the wrapped state of the wire sheet, Fig. 4 is a perspective view of the inner cylinder of the coil, 5 is a perspective view of the outer cylinder of the coil, FIG. 6 is a perspective view of a conventional coil, FIG. 7 is a developed view thereof, FIG. 8 is a half-sectional view of an embodiment of the present invention, and FIG. 9 is a plain view. FIG. 10 is a perspective view showing the winding state of the wire sheet and the insulator, and FIG. 10 is a side view of each wire at the end of the wire sheet. 11... Coil, 12... Coil inner cylinder, 13
...First wire sheet, 13a, 13b, 16
a, 16b... Opposing strand, 13c, 16c... Element wire, 13d... End, 14... First insulator, 1
5... Coil outer cylinder, 16... Second wire sheet, 17... Second insulator, 18... Cylindrical insulating layer.

Claims (1)

[Claims] 1. A first strand sheet in which a large number of strands of strands are arranged in parallel in an insulated state is wound in a spiral shape with a first insulator interposed on the side end surface thereof, and both ends of the strands are respectively A coil inner cylinder extending in the cylinder axis direction, a cylindrical insulating layer laminated on the outer circumferential surface of the coil inner cylinder, and a cylindrical insulating layer laminated and adhered on the outer circumferential surface of the cylindrical insulating layer, the first element A second wire sheet having the same configuration as the wire sheet is attached to the side end surface of the second wire sheet.
a coil wound spirally in the opposite direction to the first insulating sheet so as to interpose an insulator therebetween, and having both ends of the wire extended in the axial direction of the cylinder so as to have the same length as the inner cylinder of the coil; an outer cylinder;
A large number of jumper wires are provided in which a single loop electric path is formed between the inner coil cylinder and the outer coil cylinder by bridging opposing strands on both end faces of the inner coil cylinder and the outer coil cylinder. coil.