JPS6184011A - Coil spool for transformer and the like - Google Patents

Abstract

PURPOSE:To reduce the compressive load effecting on the inside of the flat wire and tensile load affecting on the outside thereof by forming the corner for the flat wire winding surfaces of the coil spool main frame into a shape where its convex corner part is rounded off. CONSTITUTION:The coil spool main frame 1 is shaped into a L-cross section which is mounted on the corner 3 of the iron core 2. This main frame 1 has a side faces 4a and 4b which are parallel to the two sides 2a and 2b of the iron core 2 on the flat wire winding surface 4. These are connected along the corner surface 4c. This corner surface 4c is formed into a shape where its convexed corner is rounded off. The flat wire C is wound edgewise on the coil winding frame constructed in such method so that, at the surface 4c, the flat wire C expands in a circular arc-shape through the bending processing, thereby forming a escape margin 6 between the flat wire C and the surface 4c, with a sufficiently reduced into core dimension for high-frequency application. If the load and tensile load compression produced on the flat wire C increase, the flat wire escapes into this escape margin, with less deformation level of the flat wire C to be formed into a trapezoid.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention is applicable to, for example, a switching circuit type small melting J6
A fill winding frame for transformers, etc. used in AT sources, in particular, the coil used in transformers, etc. is a rectangular wire with a large aspect ratio, and it is wrapped around an iron core using the flat winding method (edgewise bending method). This invention relates to coil winding frames used in type transformers, etc.

(Prior art) In general, this type of coil has a vertical width of 5 to 15 m1m + a horizontal width d of 1 to 5 m/m, as shown in Figure jS7.
Either a copper or aluminum rectangular wire with an extremely large aspect ratio, such as the one shown in FIG. The above-mentioned hirauchimaki, which will be explained below about the insulated material called Nomex tape Shun, is made by using this flat wire C with the thinner width side facing the iron core side as shown in Figures 8 and 9. As is clear from the figure, the flat wire winding method, in which the flat wire C is wound in an upright shape, has the advantage of having a good space factor and a wide cooling area for the flat wire C.

However, Hirauchimaki uses a small width as a starting point and is wound with a rectangular wire C standing up in an unstable shape, and the iron core diameter is 14.
Since it is a % type, the curvature of the rectangular wire C wound around it becomes small, causing a 4fA warp or tearing of the insulating tape B. In other words, a transformer with an iron core usually has a coil winding frame E at the corner of the iron core. The coil is wound from above on the winding frame, and the corner surface F of this winding frame is a convex curved surface centered on the corner of the iron core. Therefore, the rectangular wire C is bent along the convex curved surface F in the coil winding frame E, and the compressive load is applied to the inside in contact with the coil winding frame E, and the tensile load is applied to the outside, and the size of the iron core is large. This is not a problem when the curvature of the winding surface F, which is the outer surface of the coil winding frame E, is large, but as the dimensions of the iron core become smaller and the curvature of the winding surface F becomes smaller, the rectangular wire C becomes a coil. Point contact occurs at a part of the corner of the winding surface F of the winding frame E.

Flat wire C collapses. Also, since the cross-sectional area of the flat wire C does not change, if the bending force increases, the pressure * load on the inside of the flat wire C and the tensile load on the outside will increase, and the flat wire C will become a platform as shown in Figure 9. The shape is deformed, the insulating tape B is torn, and dielectric breakdown is likely to occur.For this reason, the iron core is
For small transformers designed for high frequencies such as layers/m x 35 m/■, the Hirochi winding method cannot be adopted, and it is possible to manufacture small transformers with a good space factor and a large cooling surface area for the coil. There wasn't.

(Problems to be Solved by the Invention) The present invention is designed to reduce the size of the iron core to a sufficiently small size for use in high frequency transformers, by winding a rectangular wire around the iron core.
The object of the present invention is to provide a coil winding frame that can be wound without collapsing the rectangular wire or losing insulation strength.

(Means for Solving the Problem) The present invention makes the corner surface of the rectangular wire winding surface of the coil winding frame body, which corresponds to the corner of the iron core to which the body is mounted, a convex curved surface as in the conventional case. Rather than having a shape, the convex curved surface is cut out.

(Function) According to the present invention, the corner surface portion that imparts curvature to the coil that is flat-wound has a sloped or concave shape similar to that obtained by cutting out the convex curved surface of the conventional similar coil A frame. In the middle of the day, there is a gap between the flat wires.
occurs, and the rectangular wire automatically falls into the relief allowance in response to excessive bending force, reducing the compressive load acting on the inside of the rectangular wire and the tensile load acting on the outside, and reducing the difference between the two loads. can.

(Actual M Example) An embodiment of the present invention will be described below with reference to FIGS. 1 to 6.

Fig. 1 is a perspective view of a coil winding frame, and the main body l is made of an insulating material, such as a molded product of baking material, and as shown in Figs. It is said to have a shaped cross section. This coil winding frame main body l has side surfaces 4a and 4b parallel to the vertical and horizontal 2g4 surfaces 2a and 2b of the iron core 2 on the outer surface in the above-mentioned installed state, that is, the rectangular wire winding surface 4, and these are formed by corner surfaces 4c. 1! ! Continued. In a conventional coil winding frame, the corner surface portion 4c is formed into a convex curved surface centered on the corner of the iron core, as shown in FIG.

In the present invention, instead of forming a continuous surface of such a convex curved surface, a straight slope is formed by cutting out the conventional convex curved surface. Or Figure 4+a), t
It is shaped like a concave shape with a rough and deep cut like b+.

When the rectangular wire C is flat-wound using the coil winding frame configured in this manner, the rectangular wire C is physically bent at the corner surface 4c of the coil winding frame main body 1 as shown in FIG. By bending in a circular arc shape with curvature, the corner surface portion 4C and the side surface portion 4a.

4b, a relief allowance (bulge allowance) 6 is formed between the rectangular wire C and the corner surface part 4 due to the abolishment of the conventional convex curved shape, and as a result, the iron core dimension has been sufficiently miniaturized for high frequency use, and the rectangular wire C
If the compressive load and tensile load that occur in
By increasing lC to this relief allowance 6, the extent to which the rectangular wire C is deformed into a trapezoid as shown in FIG. 9 is reduced. In other words, in the case of a conventional type coil winding frame: As a result of the convex curved surface shown by the broken line in the JSS diagram regulating the curvature shape of the flat wire C, deformation of the flat wire C, that is, escape of the flat wire cannot occur. On the other hand, in the case of the winding frame structure shown in Fig. 1, the rectangular wire C is
1.: It is possible to deform in the direction of the arrow in the face, that is, to fall into the relief allowance 6, and it is possible to substantially increase the curvature of the rectangular line C, thereby causing load relief. Therefore, the flat wire C is stably attached to the coil winding frame 1 and the iron core 2 without falling over or tearing the insulating tape. It will be A.

According to experiments, the vertical width is 12 m/m and the horizontal width d is 2.2 m.
/w aluminum square wire is used for winding using the coil winding frame of the present invention.

As shown in FIG. 6, winding of the rectangular wire C around the high-frequency iron core 2 of 25 mm length/width/@-55 m/m was achieved without causing the rectangular wire C to collapse or cause dielectric breakdown. The thickness of the coil winding frame main body 1 used in this case was 6 m+/min, and the corner surface portion 4C was a linear slope continuous at an angle of 45 degrees with respect to the side surfaces 4a and 4b. By the way, in the case of transformers that conventionally used flat-shaped windings of the same type of flat wire, the dimensions of the iron core were 50 m/1 m - 120 m/cm in length and width, the thickness of the coil winding frame was 18 cm/cm, and the curvature of the corner surface. The radius is also 18 m/- or more, and if the dimensions of the iron core and coil winding frame were to be further reduced, the incidence of flat wire collapse and dielectric breakdown described above would increase significantly.

According to the embodiment drawings, one coil winding frame is attached to each corner 3 of the iron core 2, but this is a U-shaped coil winding frame structure in which two coil winding frames are combined into one body. Of course, this is a good thing.

(Effects) As detailed above, if the coil winding frame according to the present invention is used, the rectangular wire will not collapse or dielectric breakdown will occur.
Since the rectangular wire can be wrapped around a sufficiently miniaturized high-frequency iron core, the performance and quality of transformers and the like can be improved.

[Brief explanation of drawings]

1 to 6 show one embodiment of the present invention. 1 is a perspective view of a coil winding frame according to the present invention, FIG. 2 is a perspective view showing a schematic configuration of a transformer using the coil winding frame of FIG. 1, and FIG. 3 is a perspective view of the coil winding frame of FIG. 1. Front view, Figure 4 Ca
+, +b) is a front view showing a modified example of the coil winding frame shape, Figure 5 is a cross-sectional view of the main part for explaining the function, and Figure 6 is an example of an experiment in which a transformer was constructed using the coil winding frame shown in Figure 1. This is a drawing showing an example of the dimensions of each part based on the figure. Figure 7 is a perspective view of a rectangular wire coil, and Figure 8 is a diagram of a rectangular wire wound using a conventional coil winding frame. 1 is a front view of the transformer, and FIG. 9 is a partial plan view of FIG. 8. ■...Coil winding frame body 2...Iron core 3...Iron core corner 4...Flat wire winding surfaces 4a, 4b...Side surface 4C...Corner surface C...Insulation Processed flat wire patent applicant Osaka Electric Co., Ltd. agent Patent attorney Takashi Suzue - Figure 5 Figure 6 Figure 7 Figure 8 Figure 9

Claims (1)

[Claims] (1) A coil winding frame for a transformer, etc., in which a rectangular wire with a large aspect ratio is wound around an iron core, and the corners of the iron core are A coil winding frame for a transformer, etc., in which a corresponding corner surface is not formed into a convex curved surface but is formed in a shape obtained by cutting out the convex curved surface.