JPH066492Y2 - Resin cast coil - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a resin casting coil of a static electric device such as a transformer or a reactor, and more particularly to improvement of mutual connection between winding sections.

[Conventional technology]

4 to 6 show a conventional resin casting coil disclosed in, for example, Japanese Utility Model Publication No. 53-39293, FIG. 4 is a cross-sectional view of the coil, and FIG. 5 is shown in FIG. FIG. 6 is a cross-sectional view taken along line VV, and FIG. 6 is a perspective view of a crossover lead overlapping connection portion. 4 to 6, (1) to (4) are winding sections in which winding conductors are wound in a circumferential direction together with insulating paper, and the winding sections have an inner peripheral portion due to their configuration. It becomes the winding start portion and the outer peripheral portion becomes the winding end portion. From the winding ends of each winding section (1) to (4), the crossover leads (1a) to (4a) between the winding sections (1) to (4) are connected to each winding section (1) to (4).
It is led out to the outside in the radial direction of (4), and its tip is bent in the axial direction of the winding. Then, as shown in FIGS. 5 and 6, between the crossing leads (1a)-(2a), (2a)-(3
a), (3a)-(4a) are polymerized with each other, and the polymerization connection (5)
Connect each winding section (1) to (4) with a clip etc.
Are connected in series. With the above configuration, a resin casting coil is formed by casting epoxy resin, for example, integrally with the winding in order to simplify the insulation of the winding and make it compact. In the figure, (6) shows a resin layer formed by resin casting.

[Problems to be solved by the invention]

Since the conventional resin casting coil is configured as described above, the overlapped connecting portion of the crossover leads (1a) to (4a) during resin casting.
(5) also needs to be embedded in the resin layer (6). As a result,
The resin layer thickness T in the outer region of the winding where the overlap connection (5) of the crossover leads (1a) to (4a) is present becomes thicker than the inner thickness t, and the amount of resin required for casting Is uneconomically injected in excess of the proper amount required for insulation, and leads to an increase in the size of the coil. Further, there is a problem that the heat dissipation effect of the loss generated in the winding is hindered.

The present invention has been made in order to solve the above problems, and an object thereof is to obtain a resin casting coil which can reduce the thickness of the resin layer in the outer region of the winding and has a high heat dissipation effect.

[Means for solving problems]

A resin casting coil according to the present invention has a shape in which a crossover lead is bent at opposite ends and substantially at right angles, and a central part has substantially the same dimension as the radial thickness of each winding section. In order to electrically connect the winding start part and the winding end part of the adjacent winding sections with this crossover lead, the crossover lead is arranged with its central portion between the winding sections and one end thereof. One winding section is arranged on the inner peripheral side, and the other end is arranged on the outer peripheral side of the other winding section.

[Action]

In this invention, since the crossover leads connecting the winding sections do not protrude from the outside of the winding, the thickness of the resin layer is reduced.

[Example of device]

An embodiment of the present invention will be described below with reference to the drawings. First
FIG. 2 is a cross-sectional view of the coil, FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1, and FIG. 1 to 3, (1) to (4) and (6) are the same as the conventional one, and (5a) is each winding section (1) to (4) and a crossover lead (7). Is the joint. Also, crossing lead (7)
The end portions are bent in directions opposite to each other and substantially at right angles, and the central portion has a shape having substantially the same dimension as the radial thickness of each winding section. In this invention, as shown in FIG. 2 and FIG.
Winding sections (1) and (2), (2) and (3), which are adjacent in (7),
In order to electrically connect the winding start part and the winding end part of (3) and (4), this crossover lead is arranged in the center part between each winding section and one end thereof is arranged in one winding section. Of the winding section (1) to (4) are connected in series by arranging the other end on the inner circumference side of the other winding section on the outer circumference side of the other winding section and joining them with a conductive adhesive, welding, etc. is doing.
According to this configuration, the crossover lead (7) and each winding section
Since (1) to (4) are directly joined, the joint (5
The protrusion a) is almost nonexistent only by the thickness of the transition lead (7). Therefore, the resin layer thickness T in the outer region of the winding
_{In the case of No. 1, it} is necessary to form only the dimensions required for electrical insulation. That is, the resin layer thickness T ₁ on the outer side of the winding can be made to have the same dimension as the resin layer thickness t that is determined as the insulating thickness that requires insulation of the winding section. Also,
Generally, the windings of electrical equipment generate heat due to electrical loss due to energization,
This generated heat propagates through the resin layer (6) and is radiated to the atmosphere. By reducing the resin layer thickness T ₁ on the outside of the winding, the heat radiation effect can be improved.

[Effect of device]

As described above, according to the present invention, the winding sections formed by winding the winding conductor in the circumferential direction are arranged in the axial direction, and the coils formed by connecting the winding sections in series with leads are made of resin. In a resin cast coil formed by casting, the crossover leads are bent at opposite ends and at a substantially right angle, and the center portion has a shape having substantially the same size as the radial thickness of each winding section. In order to electrically connect the winding start part and the winding end part of the adjacent winding section with this crossover lead, the crossover lead is arranged with its central portion between the winding sections and Since one end is arranged on the inner peripheral side of one winding section and the other end is arranged on the outer peripheral side of the other winding section, in order to reduce the number of coil components and improve assembly, Winding of wire In a coil using winding sections of the same direction), the crossover lead may protrude to the outer area of the winding section during the electrical connection between the winding start portion and the winding end portion of the adjacent winding sections. Without
The resin layer thickness can be reduced. Therefore, it is possible to reduce the amount of resin required for resin casting of the winding wire, which leads to cost reduction and reduction in size and weight of the coil, and to obtain a resin casting coil that improves the heat dissipation effect of heat generated in the winding wire. It is effective.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a resin casting coil according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG. 3 is a view showing mutual joining of winding sections according to the present invention. FIG. 4 is a cross-sectional view of a conventional resin casting coil, FIG. 5 is a VV cross-sectional view of FIG. 4, and FIG. 6 is a view showing a conventional crossover lead joint. In the figure, (1) to (4) are winding sections, (5a) is a joint, (6) is a resin layer, and (7) is a crossover lead. In the drawings, the same reference numerals indicate the same parts.

Claims (1)

[Scope of utility model registration request] 1. A coil formed by winding winding conductors in a circumferential direction and arranging the winding sections in an axial direction, and connecting the winding sections in series with leads to form a resin mold. In the resin cast coil, the above-mentioned crossover lead is assumed to have a shape in which end portions are bent in opposite directions and substantially at right angles, and a central portion has a shape having substantially the same dimension as a radial thickness of each winding section. In order to electrically connect the winding start part and the winding end part of the adjacent winding sections with the crossover lead, the crossover lead is arranged at the central part between the winding sections and one end of the crossover lead is arranged on one side. A resin cast coil, characterized in that the other end is arranged on the inner peripheral side of the wire section and the other end is arranged on the outer peripheral side of the other winding section.