JPS63132408A - Wound core - Google Patents

Abstract

PURPOSE:To prevent the generation of a clinch on the inner surface of a coil bobbin and also to prevent coil bobbin from becoming not possible to be pressure-welded by a method wherein the cross-sectional shape of both starting part and the finishing part of the winding of a wound core is formed into oval shape, and the other part of the crosssection is formed into round shape in the same manner as in the past. CONSTITUTION:The starting part 11 and the finishing part 12 of the cross section of a wound core 1' are formed into an oval shape, and the cross section of other part is formed into a round shape as in the past. As a result, even when the starting part 11 or the finishing part 12 of winding is slipped out of place, as the gap 4' of a coil bobbin 2 is sufficiently large, the generation of clinching of the inner surface of the coil bobbin, especially its pressure- welding part 3, or the impossibility of pressure-welding of the coil bobbin 2 can be mostly prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a wound core of a transformer to which a cylindrical coil bobbin is applied.

[Conventional technology]

Recently, circular cross-section cores, which have the advantages of being ultra-thin, compact, and lightweight, have come to be used as wound cores for transformers to which cylindrical coil bobbins are applied (Reference: Japanese Patent Publication No. 60-2
No. 8375, No. 61-22851). That is, the wound core 1 shown in FIG. 4 has the width direction shown in FIG. 5(A),
It is obtained by winding a band-shaped material with excellent magnetic properties cut out in the predetermined shape shown in (B) according to the shape, and its cross section is circular. A cylindrical coil bobbin 2, which has been divided into two in advance, is pressed against the wound core 1 at a pressure contact surface 3, and the coil bobbin 2 is connected to the wound core 1.
Winding wire (
(not shown).

Therefore, in this case, the gap 4 between the wound core 1 and the coil bobbin 2 becomes smaller, and excellent magnetic properties are obtained.

[Problem that the invention seeks to solve]

However, in the wound core 1 shown in FIG. 4, the winding start and winding end portions of the band-shaped material tend to shift from the winding center position depending on the device or the end processing operation, for example, the arrow X in FIG. .

It may collapse as shown in Y. As a result, when the coil bobbin 2 is pressed and rotated, the inner surface of the coil bobbin 2, especially the pressure-welded part, gets caught, making it impossible to wind the winding wire, or, in the worst case, making it impossible to press the coil bobbin 2. There was a problem that.

Therefore, an object of the present invention is to provide a wound core that can prevent the inner surface of the coil bobbin 2 from being caught and the coil bobbin 2 to be unable to be pressed, even if the winding start and winding end portions of the wound core are deviated from the winding center position. There is a particular thing.

[Failure to solve the problem]

In order to solve the above-mentioned problems, the present invention, as shown in FIG. This is what I did. Note that only one of the winding start and winding end portions may have an elliptical shape.

[Effect]

According to the above-mentioned means, vl and catching on the inner surface of the coil bobbin and the inability to press the coil bobbin are prevented, and in this case, although the gap between the wound core and the coil bobbin increases, the amount thereof is minimized.

〔Example〕

FIG. 2 is a sectional view showing a wound core equipped with a coil bobbin according to the present invention. In FIG. 2, the winding start portion 11 and winding end portion 12 of the wound core 1' have an elliptical cross section. Therefore, the winding start part 11 and the winding end part 1
2 and the coil bobbin 2 is larger than in the case of FIG. 4, but its amount is minimal. Second
In the wound core 1' shown in the figure, even if the winding start part 11 or the winding end part 12 deviates from the winding center position, the gap 4' with the coil bobbin 2 is sufficiently large, so the inner surface of the coil bobbin 2, especially the There is almost no possibility that the press-contacting part 3 gets caught or that the coil bobbin 2 becomes impossible to press-contact.

Further, the thickness t' of the wound core 1' in FIG. 2 is smaller than the thickness t of the wound core 1 in FIG. 4. Therefore, the total length of the wound core 1' shown in FIG. 3, that is, the total length of the transformer, is also reduced, which contributes to the miniaturization of the transformer.

In the above-mentioned embodiment, both the winding start and @end portions are elliptical, but even if only one of them is elliptical, the effect is still more effective than the conventional type, although the effect is slightly inferior.

〔Effect of the invention〕

Even if the coil bobbin is deviated from its winding center position, the inner surface of the coil bobbin can be prevented from being caught and the coil bobbin cannot be pressed.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the basic configuration of the present invention, FIG. 2 is a sectional view showing a wound core equipped with a coil bobbin according to the present invention, FIG. 3 is a perspective view showing the overall configuration of FIG. The figure is a cross-sectional view showing a wound core equipped with a conventional coil bobbin, Figure 5 is a plan view showing an example of the strip material shown in Figure 4, and Figure 6 is a cross-sectional view to explain the problem in Figure 4. It is. i, i': Winding core 11.12: Winding start part, winding end part 2: Coil bobbin 4.4': Gap

Claims (1)

[Claims] 1. In a wound core to which a cylindrical coil bobbin for winding a winding wire is applied, the cross-sectional shape of both or one of the winding start and winding end portions of the winding core is elliptical; A wound core characterized in that the cross-sectional shape of the other portion is circular.