JP3238049U - Interlayer insulation structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a toroidal reactor or a toroidal transformer in which windings are laminated on a toroidal core. Provided is a simple and inexpensive interlayer insulating structure capable of preventing the inner diameter dimension from being reduced due to excessive overlap of insulating tapes on the circumference and the workability of the winding being lowered. An interlayer insulating structure consists of an insulating tape 4 spirally wound along the circumferential direction of a toroidal core from above a lower winding wound around the toroidal core 1, and a toroidal from above the insulating tape. It is composed of an insulating sheet 5 which is attached and contacted so as to cover the outer peripheral surface of the core and both end faces in the tubular axis direction and is fixed by a winding 3 of an upper layer wound from above. [Selection diagram] FIG. 5

Description

The present invention relates to an interlayer insulation structure for preventing a short circuit between windings in a toroidal reactor or a toroidal transformer in which windings are laminated on a toroidal core.

Conventionally, in order to prevent a short circuit between the windings laminated on the toroidal core, a resin film or paper insulating tape is spirally laminated so as to cover the lower winding (for example, the primary coil) wound around the core. An interlayer insulation structure is generally adopted in which a winding is wound and an upper winding (for example, a secondary coil) is wound (stacked) on the winding. As a method of laminating insulating tapes, for example, in addition to half-wrapping (half-wrapping) in which two tapes are stacked as a whole by shifting them by 1/2 in the width direction, the insulation strength is insufficient due to half-wrapping. In some cases, two-thirds wraps made by stacking three sheets or 3/4 wraps made by stacking four sheets are applied, or half wraps are made into two layers.

However, in a donut-shaped toroidal core, the circumferences of the outer peripheral surface and the inner peripheral surface are different. If the inner diameter is reduced due to the excessive overlap of the insulating tapes in the above, the workability of the winding is lowered. On the other hand, the insulating tape has irregularities on the lower side due to the winding of the lower layer, and the winding of the upper layer wound from above bites into the unevenness and extends, and the outer peripheral surface side where the overlapping width is small is partially rolled up and has a gap. In some cases, it may not be possible to secure the desired dielectric strength, and if a high voltage is applied, corona discharge may occur and the tape material may deteriorate.

In contrast to the above, for example, as shown in FIG. 3 of Patent Document 1, a narrow portion is formed for each roll in the portion of the insulating tape in contact with the inner peripheral surface side of the toroidal core, or the fourth of the same document. As shown in the figure, it has been proposed to use an insulating tape in which yarns are crossed diagonally and apply tension to the tape at a portion in contact with the inner peripheral surface side to generate a narrow portion. However, these interlayer insulation structures have a problem that they are very troublesome or expensive to manufacture.

Special Publication No. 59-23906

In view of the above circumstances, the present invention insulates a toroidal reactor or toroidal transformer in which windings are laminated on a toroidal core due to uneven gaps between windings on the outer periphery of the toroidal core and insufficient overlap of insulating tapes. An object of the present invention is to provide a simple and inexpensive interlayer insulation structure that can prevent breakdown and deterioration of winding workability due to a decrease in inner diameter due to excessive overlapping of insulating tapes on the inner circumference of the toroidal core. And.

The device of claim 1 is
In an interlayer insulation structure that is interposed between the upper and lower windings laminated on the toroidal core to prevent short circuits between the windings.
Insulation tape that is spirally overlaid along the circumferential direction of the toroidal core from above the lower winding wound around the toroidal core.
It is composed of an insulating sheet that is attached and contacted from above the insulating tape so as to cover the outer peripheral surface of the toroidal core and both end surfaces in the tubular axis direction, and is fixed by an upper layer winding wound from above. It provides a characteristic interlayer insulation structure.

The device of claim 2 is
In an interlayer insulation structure that is interposed between the upper and lower windings laminated on the toroidal core to prevent short circuits between the windings.
Insulation tape that is spirally overlaid along the circumferential direction of the toroidal core from above the lower winding wound around the toroidal core.
It is a strip-shaped body that is slightly longer than the outer peripheral length of the toroidal core and is formed wider than the thickness width in the tubular axis direction of the toroidal core. An interlayer insulation structure characterized by being composed of an insulating sheet in which each portion is folded so as to cover both end faces in the tubular axis direction of the toroidal core and is fixed by an upper layer winding wound from above. offer.

The device of claim 3 is
2. The second aspect of the insulating sheet, which is folded so as to cover both end faces, is set to a length that is interrupted in the middle of the both end faces from the outer peripheral surface side to the inner peripheral surface side. The described interlayer insulation structure is provided.

According to the interlayer insulation structure of the present invention, it is possible to easily and inexpensively prevent dielectric breakdown due to non-uniformity of gaps between windings on the outer periphery of the toroidal core and insufficient overlap of insulating tapes, and excessive insulating tape is formed on the inner circumference of the toroidal core. It is possible to prevent a decrease in workability of the winding due to a decrease in the overlapping inner diameter dimension.

The figure which shows the state of superimposing the insulating tape on the lower winding wound wound around a toroidal core. The figure which shows how the insulating sheet is wound around the outer peripheral surface of a toroidal core from the top of the insulating tape. The figure which shows how the insulation sheet is folded into the end face of a toroidal core. The figure which shows the state which the insulation sheet is folded in the both end faces of a toroidal core. The figure which shows the state of winding the winding of the upper layer from the top of the insulating tape and the insulating sheet.

An embodiment of the interlayer insulation structure of the present invention will be described with reference to FIGS. 1 to 5. The interlayer insulation structure of the present embodiment is a toroidal transformer in which a lower winding (primary coil) 2 and an upper winding (secondary coil) 3 (FIG. 5) are wound around a donut-shaped toroidal core 1 so as to be laminated. In the above, it is provided so as to be interposed between the lower winding 2 and the upper winding 3 to prevent a short circuit between the windings, and the insulating tape 4 and the insulating sheet 5 (FIGS. 2 to 5) are used as shown below. It is composed.

The toroidal core 1 on which the windings are laminated is a thick-walled cylinder with a substantially rectangular cross section made of a magnetic material such as ferrite. It has end faces 1c and 1c, and the entire core is preliminarily insulated by coating with polyamide, epoxy resin, or the like.

In the toroidal core 1, the lower winding 2 is wound around the entire circumference along the circumferential direction, and the insulating tape 4 forming a part of the interlayer insulation structure from above is the toroidal core as shown in FIG. It is spirally wound over the entire circumference along the circumferential direction of 1. In this lap winding, the overlapping width between the insulating tapes 4 is smaller than 1/2 of the tape width on the outer peripheral surface 1a side in order to prevent the tapes from overlapping excessively on the inner peripheral surface 1b side of the core and becoming stiff. Is set conservatively. As the tape material, resin films such as polyester, aramid, polyimide, and polyamide, and paper materials are used.

By reducing the overlapping width of the insulating tape 4 as described above, the excessive overlap on the inner peripheral surface 1b side is eliminated, but on the other hand, in the outer peripheral surface 1a and the portions of both end surfaces 1c and 1c that are close to the outer peripheral surface 1a. Since gaps are likely to occur, the insulating performance is ensured by further covering these portions with the insulating sheet 5 from above the insulating tape 4 as shown in FIGS. 2 to 4. The insulating sheet 5 is a sheet material made of the same material as the insulating tape 4, and is formed in a substantially rectangular band shape that is slightly longer than the outer peripheral length of the toroidal core 1 and wider than the thickness width in the tubular axis direction of the toroidal core 1. The body.

The insulating sheet 5 is wound in the longitudinal direction so as to cover the entire outer peripheral surface 1a of the toroidal core 1 as shown in FIG. 2, and both in the tubular axial direction from the outer peripheral surface 1a as shown by the white arrow in FIG. Both sides in the band width direction protruding outward are folded so as to cover both end faces 1 and 1c of the toroidal core 1. By doing this over the entire circumference, as shown in FIG. 4, the outer peripheral surface 1a and both end faces 1c and 1c where gaps are likely to occur due to the insulating tape 4 are covered with the portions close to the outer peripheral surface 1a, and interlayer insulation is ensured. Will be done. If both sides of the insulating sheet 5 in the band width direction wrap around to the inner peripheral surface 1b side, it may cause stiffening. The length is set to be interrupted by.

Finally, as shown in FIG. 5, the winding 3 in the upper layer is wound from above the insulating sheet 5 along the circumferential direction of the toroidal core, so that the insulating sheet 5 is fixed so as not to be rolled. As described above, the insulating tape 4 spirally wound along the circumferential direction of the toroidal core 1 from above the lower winding 2 wound around the toroidal core 1, and the toroidal from above the insulating tape 4. An interlayer insulating structure is formed consisting of an insulating sheet 5 which is attached so as to cover the outer peripheral surface 1a of the core and both end faces 1c and 1c in the tubular axis direction and is fixed by a winding of an upper layer wound from above. Will be done.

Even if the stacking width when winding the insulating tape 4 is reduced, the gap between the windings of the insulating tape 4 is still larger on the inner peripheral surface 1b side than on the outer peripheral surface 1a side, but in the insulating sheet 5. By covering the windings, the gap between the windings on the outer peripheral surface 1a side is also increased, so that the non-uniformity of the dielectric constant between the windings is improved. As described above, in the interlayer insulating structure of the present embodiment, a strip-shaped insulating sheet 5 made of a resin film or paper material of the same material is added to the conventional interlayer insulating structure in which the insulating tape 4 is spirally wound around the toroidal core 1. Although it is a simple and inexpensive configuration, it is possible to reliably prevent dielectric breakdown due to non-uniformity of gaps between windings and insufficient overlap of insulating tapes.

In the above embodiment, a toroidal transformer in which a secondary coil is laminated on a primary coil wound around a toroidal core has been described, but a toroidal reactor in which continuous windings are laminated in multiple layers, and other toroidal cores have a plurality of layers. It can be applied in all cases where windings are laminated. In the above embodiment, the stacking width of the insulating tape 4 is smaller than that of the half wrap, but the stacking width on the inner peripheral edge side differs depending on the outer diameter dimension and the inner diameter dimension of the toroidal core. It is not limited to setting. The insulating sheet 5 may be used exclusively for correcting the non-uniformity of the gap between the windings on the inner and outer peripheral surfaces.

In the above embodiment, the insulating sheet 5 to be covered over the insulating tape 4 is one sheet, but two or more insulating sheets may be covered. Others The interlayer insulation structure of the present invention is not limited to the above embodiment, and various changes can be made without changing the gist of the invention.

1 Toroidal core 2 Lower winding 3 Upper winding 4 Insulation tape 5 Insulation sheet

Claims (3)

In an interlayer insulation structure that is interposed between the upper and lower windings laminated on the toroidal core to prevent short circuits between the windings.
Insulation tape that is spirally overlaid along the circumferential direction of the toroidal core from above the lower winding wound around the toroidal core.
It shall be composed of an insulating sheet that is attached and contacted from above the insulating tape so as to cover the outer peripheral surface of the toroidal core and both end surfaces in the tubular axis direction, and is fixed by an upper layer winding wound from above. An interlayer insulation structure characterized by. In an interlayer insulation structure that is interposed between the upper and lower windings laminated on the toroidal core to prevent short circuits between the windings.
Insulation tape that is spirally overlaid along the circumferential direction of the toroidal core from above the lower winding wound around the toroidal core.
It is a strip-shaped body that is slightly longer than the outer peripheral length of the toroidal core and is formed wider than the thickness width in the tubular axis direction of the toroidal core. An interlayer insulation structure characterized in that each portion is folded so as to cover both end faces in the tubular axis direction of the toroidal core, and is fixed by an upper layer winding wound from above. .. 2. The second aspect of the insulating sheet, which is folded so as to cover both end faces, is set to a length that is interrupted in the middle of the both end faces from the outer peripheral surface side to the inner peripheral surface side. The interlayer insulation structure described.

Images