JPH0642434B2 - Mold winding - Google Patents

Description

TECHNICAL FIELD The present invention relates to a molded winding using a strip conductor, and more particularly,
The present invention relates to a winding structure for a molded transformer, in which the work of filling a thermosetting putty-like resin on the ends of the winding is easy.

[Background of the Invention]

FIG. 1 shows a vertical sectional view of a conventional mold winding. The insulating layer 1 reinforced with glass fibers is, for example, a prepreg that is semi-cured by impregnating a glass tape with epoxy resin and is wound to have a predetermined thickness. The strip conductor 3 is wound in the radial direction a required number of times to form a coil. Insulating papers 5 and 6 required to insulate the voltage induced during the winding are wound between the windings of the strip conductor 3. However, in order to avoid the dielectric breakdown due to the pinholes of the insulating paper, usually two sheets are wound. It is wound as a set. Further, in order to prevent the bridging between the both ends of the strip conductor 3, the width of the insulating papers 5 and 6 is determined so that it travels a few mm from the width of the strip conductor 3. The same insulating layer 2 as the inner side is formed on the outermost periphery that is wound a predetermined number of times.

When this whole coil was subjected to a process at an appropriate temperature for 1 hour in a drying oven, the insulating papers 5 and 6 were dried, and the insulating layers 1 and 2 in the semi-cured state were completely cured, so that they were integrated. You can make a coil.

Next, both ends of this coil are filled with a putty-like thermosetting resin 4 in a semi-cured state, and the whole is heated again in a drying oven so that the resin is insulated from the insulating layers 1 and 2 and the insulating paper 5. , 6 to be hardened so as to adhere.

Thus, a molded coil having excellent moisture resistance and dust resistance is manufactured, but the structure of FIG. 1 has the following drawbacks. First, since the insulating papers 5 and 6 are traveling from the strip conductor 3, it is extremely difficult to fill the gap between the projecting portion and the end of the strip conductor 3 with the putty-like thermosetting resin. Secondly, when the putty-like resin is forcibly filled, there is a possibility that the insulating papers 5 and 6 may be split at the ends thereof and the insulating effect due to the protrusion of the bent corner may be lost.
Therefore, in such a structure, it is necessary to vacuum-inject a liquid resin, which requires a lot of man-hours. Therefore, in order to solve this drawback, as shown in FIG. 2, it is conceivable to fill the gap between the protruding portions of the insulating paper described in FIG. Since the thickness is about 2 mm and the protruding portion has a small gap of several mm, it is extremely inconvenient to wind the strip conductor 3 at the same time. The same applies to the method of filling the strip conductor 3 at the end of the winding operation.

[Object of the Invention]

An object of the present invention is to form a glass fiber reinforced FRP insulating layer on the inner and outer circumferences of a winding, and use this FRP insulating layer instead of a casting mold to thermoset the winding end. In a mold winding with a structure filled with resin, make sure that the width of the insulating paper is the width of the insulating paper so that the protrusion of the insulating paper between turns does not hinder the work during resin filling. To provide a mold winding that is equal in width.

[Outline of Invention]

The main point of the present invention is that both ends of an aluminum strip or a copper strip are folded back in the middle to cover continuously both ends.

Example of Invention

 The present invention implements the structure shown in FIG.

That is, in the work of winding the strip conductor 3,
Along the length direction of the strip conductor, that is, the winding direction, at both ends of the strip conductor 3, as shown in FIG. By continuously folding back and pasting it so that
Prevents bridging between both ends. In addition, for insulation other than both ends of the strip conductor 3, one sheet of insulating paper 6 having a width equal to the width of the strip conductor 3 is wound. Note that the narrow insulating paper 5 having a width corresponding to the folded back portion of the adhesive tape is wound around portions other than both ends of the strip conductor 3 to which the adhesive tape is attached.

In the embodiment of the present invention, by covering both ends of the strip conductor 3 with the adhesive tape of the insulating paper, bridging between the ends of the strip conductor 3 can be prevented, so that the conventional insulation Since it is not necessary to project the papers 5 and 6, the work of filling the resin becomes extremely easy, and the end portions of the strip conductors are filled with the resin without exception, so that a dense mold coil can be obtained. In addition, since the surface of the insulating paper that covers the ends of the strip conductors, which is not coated with the adhesive, has excellent adhesiveness to the resin, a solid molded coil can be obtained as a whole. Further, when the insulating paper travels in the end resin, it has a characteristic effect that it does not develop cracks due to thermal stress due to the notches.

〔The invention's effect〕

According to the present invention, instead of using a mold, a putty-like thermosetting resin is used to fill an insulating layer that constitutes a part of the winding, and then only heat curing is performed to obtain moisture resistance and dust resistance. It is possible to mass-produce excellent molded coils.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a conventional coil, FIG. 2 is a vertical cross-sectional view of a coil for compensating for the conventional defects, FIG. 3 is a vertical cross-sectional view of a coil of an embodiment of the present invention, and FIG. It is a perspective view showing the work situation of one example of the present invention. 1, 2 ... Insulating layer, 3 ... Strip conductor, 4 ... Panel-like thermosetting resin, 5, 6 ... Insulating paper.

Claims (1)

[Claims] 1. A molded coil having a resin insulation layer reinforced with glass fiber on the inner and outer circumferences of a winding wire, and an axial end surface of the winding wire filled with a thermosetting resin, which is used as a conductor. An end portion of a strip conductor such as an aluminum strip or a copper strip is continuously covered with an adhesive tape along the winding direction of the strip conductor, and between the windings of the aluminum strip or the copper strip conductor, A mold winding, characterized in that an insulating paper having a width equal to the width of the aluminum strip and an insulating paper having a width narrower than the folding width of an adhesive tape covering both ends of the strip are wound as a set.