JPH0696963A - Coil component - Google Patents

Abstract

PURPOSE:To reduce the loss, leakage, heat generation, and size of a coil component composed of a laminated core of silicon steel plates and constituting a squarish 8-shaped closed magnetic circuit and to improve the efficiency, characteristics, workability at the time of welding or joining joints, quality, and reliability of the parts, and to design the parts in a resource saving way. CONSTITUTION:A laminated body of I-shaped laminate cores 24 with nearly triangular wedge-shaped tapered faces of about 45 deg. at both front ends is assembled in a coil bobbin 22 wound with a winding 21 as a central magnetic leg. In addition, two laminated bodies of C-shaped laminate cores 26 with tapered faces 25 of about 45 deg. inside both-side magnetic legs are assembled in the bobbin 22 as outer magnetic legs so that the laminated bodies of the cores 24 and 26 can be joined to each other by butting the tapered faces 23 and 25 against each other from two direction. As a result, a squarish 8-shaped closed magnetic circuit is constituted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil component used in various electronic devices.

[0002]

2. Description of the Related Art In recent years, coil components such as transformers used in various consumer electronic devices are required to be compact, such as light, thin, short and small, and to have improved electrical characteristics such as low loss, low heat generation, high efficiency and low leakage flux. ing.

Due to these requirements, various magnetic core configurations have been devised from the past, such as a toroidal core system and OI.
The core type, ring core type, etc. were all effective in the wound core type made of orientated silicon steel sheet.
It was difficult to make, and the cost was high. It was required that the characteristics could be improved and the size could not be reduced by improving the butt-closed magnetic circuit configuration in a type in which laminated cores such as a general EI type are laminated.

A conventional coil component will be described below with reference to FIGS. 9 to 11, winding 1
A coil bobbin 2 wound with is laminated with an E-shaped laminated core 3 and an I-shaped laminated core 4 each made of a silicon steel plate in a predetermined thickness, and the central magnetic leg of the E-shaped laminated core 3 is After applying the adhesive to the butt portion 5, both ends 6 of the outer magnetic leg butt portion of the E-shaped laminate core 3 are welded 7 and combined to form a closed letter magnetic path, which is completed as shown in FIG. It was an item.

There is also a similar letter-shaped closed magnetic circuit structure having a similar shape as shown in FIG. 12, in which E-shaped laminated cores 8 are assembled and abutted and welded to each other.

As already shown in FIG. 13, the I-shaped laminated core 9 is formed in an inverted trapezoidal shape having tapered surfaces 10 having an angle of about 45 degrees at both ends, and the E-shaped laminated core 11 has a short central magnetic leg 12. The end faces are flat and both outer magnetic legs 13
Is longer than the central magnetic leg 12, and a tapered surface 14 having an angle of about 45 degrees is provided inside the end thereof. After laminating these, both tapered surfaces 10 and 14 are abutted to each other to form a corner 15 at both ends. It is also devised that a sunken closed magnetic circuit is formed by welding. Of course, before welding, the coil bobbin 2 having the winding 1 wound therein is incorporated in the magnetic leg.

[0007]

However, in the day-shaped closed magnetic circuit configuration as described above, first, the butted portions 5 and 6 of the E-shaped laminated core 3 and the I-shaped laminated core 4 are flat and the magnetic leg width is Since the widths of the abutting portions are the same, the magnetic resistance is large and the magnetic flux is hard to flow and easily leaks. Therefore,
In terms of electrical characteristics, there was a problem that the exciting current, iron loss, and leakage flakes were large, the efficiency was poor, and therefore the temperature rise was high and the size could not be reduced. Further, there is a problem in quality that the magnetizing force is strong and the vibration is large and the growling noise is likely to be generated.

[0008] In general, as a countermeasure, the magnetic flux density is set low or a steel plate having a high silicon content is used in terms of design. In addition, as a measure for low leakage, magnetically shielded shield plates and short rings are structurally applied. As a measure against vibration, adhesive was applied to the abutting part, welding was performed, or varnish was impregnated. However, there are problems such as obstacles to miniaturization, alienation of productivity, and increase in member cost.

As described above, the conventional transformer has problems in terms of miniaturization due to high performance and resource-saving design.

The present invention is intended to solve the above-mentioned problems, and has high performance, high quality such as miniaturization, low heat generation, high efficiency, low leakage flux, low vibration, no welding required, and no middle foot adhesion.
It is an object to provide a coil component that realizes high reliability and high workability.

[0011]

In order to achieve the above object, a coil component of the present invention comprises a coil bobbin around which a winding is wound, and a wedge-shaped end having a substantially triangular shape as a central magnetic leg incorporated in the coil bobbin. A laminate of I-type laminated cores having a tapered surface, a laminate of two C-shaped laminated cores having two tapered outer surfaces of the coil bobbin and tapered inner surfaces of both magnetic legs to form outer magnetic legs
In this configuration, the tapered surfaces of the C-shaped and C-shaped laminated cores are used as joint surfaces and are abutted in two directions to be joined to form a closed V-shaped magnetic path.

[0012]

In the above structure, the abutting portion is only the taper surface of the central magnetic leg and the outer magnetic leg portion is free, as compared with the conventional flat abutting method of the E and I type laminated cores. Further, since the contact area of the abutting portion is increased, the magnetic resistance of the abutting contact surface is reduced, and the magnetic flux passing through the magnetic path is easily passed. Therefore, the magnetic flux density near the abutting portion is small and the leakage is small. The magnetizing force is small and the vibration is small. Further, since the magnetic flux density is the lowest at the outer tip of the butted tapered surface, the iron loss loss is extremely small even if they are welded together, and it is possible to do without welding.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

In FIG. 2, a cylindrical bobbin 22 around which a winding 21 is wound is laminated with an I-shaped laminated core 24 having wedge-shaped tapered surfaces 23 of approximately triangular shape at both ends at an angle of about 45 degrees. Is inserted as a central magnetic leg and incorporated.
Next, the wedge-shaped I-shaped laminated core 24 is laminated at right angles with the C-shaped laminated core 26 in which tapered surfaces 25 having an angle of about 45 degrees are provided inside the tips of the magnetic legs on both sides in advance. Are symmetrically incorporated into the coil bobbin as outer magnetic legs to form an I-shaped laminated core 24.
Taper surface 23 and C-shaped laminated core 26 taper surface 2
5 is used as a joint surface and is abutted in two directions and coupled to form a letter-shaped closed magnetic circuit. Then, as shown in FIG. 1, a finished coil component is obtained.

At this time, as shown in FIG. 3, the two C-shaped laminated cores 26 and the one I-shaped laminated core 24 have their respective tapered surfaces 23 and 25 as contact surfaces, and the respective three tapered tip portions 27. Eventually, one linear butted portion will be formed, and even if welded together, beat welding can be performed at one location. In addition, in the structure of the coil bobbin 22, when the thickness of the collar portion 28 around which the winding wire 21 is wound is also tapered in advance and the C-shaped laminated core 26 is inserted, the bobbin can be easily inserted at the entrance and the bobbin becomes deeper as it goes deeper. The sliding position can be fixed by catching on the collar portion 28, and it is easy to abut with the I-shaped laminated core 24. Further, in the conventional E and I core methods, when the core is forcedly inserted into a large coil outer shape, the workability is extremely poor such as the coil being scratched. However, in the present invention,
Since the core insertion direction differs by 90 degrees, the coil is not damaged and workability is good.

The I-shaped and C-shaped laminated cores 24, 2
According to experiments, when the angles of the tapered surfaces 23 and 25 of No. 6 are in the range of 45 ° ± 15 °, the concentration of the magnetic flux is relieved, and the leakage flux and other electrical characteristics are effective. In one embodiment,
Experimental confirmation with a 45-degree taper showed that the same size as the conventional EI core system was compared with the exciting current of about 40
%, Iron loss was reduced by about 20%, and leakage flux was reduced by about 60%. In addition, although it is a method of connecting a closed V-shaped magnetic circuit, in general, I-shaped,
An adhesive is applied to the taper surfaces 23 and 25 of the C-shaped laminated cores 24 and 26 to temporarily fix them, and the taper tip portion 27 is welded and fixed. However, in the present invention, the coil bobbin 22
Stopper part 3 in which one I-shaped and two C-shaped laminated cores 24 and 26 are temporarily fixed to the entrance flange 29 of the cylindrical body of
By providing 0, the abutting portions of the coil bobbin 22 and the core taper surfaces 23 and 25 can be integrally fixed and joined only by applying an adhesive without welding.

Further, as shown in FIG. 4, two C
-Shaped laminated core 31 has a tapered portion 32 and an engaging protrusion 33.
And the engaging recess 3 that engages with the engaging protrusion 33 on the tapered portion 35 of the I-shaped laminated core 34 that is joined to each other.
6 is provided, and when the laminated cores are caulked by block caulking, fitted and joined, there is no adhesive,
Bonding without welding is possible. Of course, as shown in FIG. 5, the same coupling can be achieved by providing the C-shaped laminated core 31 with the engaging recess 37 and the I-shaped laminated core 34 with the engaging protrusion 38. These methods can be implemented because the abutting portions of the present invention are magnetically dispersed and not concentrated as described above, and thus the magnetizing attraction force is weak.

Further, as another embodiment of the present invention, it can be applied to a core gap of a choke transformer having a small leakage flux. As shown in FIGS. 6 to 8, the V-shaped closed magnetic circuit configuration is similar to that described above, but the two C-shaped laminated cores 39, 42, 43 and the I-shaped laminated core 40 are joined at the butt joint surface. Shapes such as taper angles at both ends and dimensions are set in advance so that the space gaps 41 and 44 exist. This can be set freely according to the required inductance value and current value, and the tapered substantially triangular gap allows easy fine adjustment of the characteristics.

[0019]

As described above, according to the transformer of the present invention, two C-shaped laminated cores and one I-shaped laminated core are abutted to form a closed V-shaped magnetic path. Since the abutted portions have no magnetic concentration and the magnetic flux density is low, the magnetic resistance is small, the leakage magnetic flux, the exciting current and the core loss are small, the power efficiency is improved, and the miniaturization design is possible.

Further, the magnetizing force of the taper junction is small and the magnetostrictive vibration of the core is small. Therefore, the adhesive for fixing the joint is unnecessary, and the welding operation is also unnecessary depending on the joint shape of the joint. Of course, it is not necessary to impregnate a varnish for fixing.

As described above, miniaturization, low heat generation, high efficiency,
Coil parts that have extremely high industrial value such as high performance such as low leakage flux and resource saving design can be realized, and high quality such as low vibration, high reliability, workability improvement such as welding less and adhesive less. What can be provided.

[Brief description of drawings]

FIG. 1 is a perspective view of a coil component showing an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the coil component.

FIG. 3 is a sectional view of the coil component.

FIG. 4 is a sectional view of another embodiment of the coil component.

FIG. 5 is a sectional view of another embodiment of the coil component.

FIG. 6 is a sectional view of a coil component showing still another embodiment.

FIG. 7 is a sectional view of another embodiment of the coil component.

FIG. 8 is a sectional view of another embodiment of the coil component.

FIG. 9 is a perspective view of a conventional transformer.

FIG. 10 is an exploded perspective view of a conventional transformer.

FIG. 11 is a sectional view of a conventional transformer.

FIG. 12 is a sectional view of a conventional transformer.

FIG. 13 is a sectional view of a conventional transformer.

[Explanation of symbols]

 21 Winding 22 Coil bobbin 23,35 Tapered surface 24,34,40 I type laminated core 25,32 Tapered surface 26,31,39,42,43 C type laminated core 27 Tapered tip portion 28 Bobbin collar portion 29 Entrance collar 30 Stopper Part 33,38 Engagement projection part 36,37 Engagement recess 41,44 Space gap

Claims (3)

[Claims] 1. A coil bobbin around which a winding is wound, a central magnetic leg incorporated in the coil bobbin, and an I-shaped laminated core having a wedge-shaped tapered surface of which both ends are substantially triangular. A stack of C-shaped laminated cores having tapered surfaces on the inner sides of the ends of the magnetic legs on both sides which are individual outer magnetic legs, and the tapered surface of the laminated I-shaped laminated core and the taper of the C-shaped laminated core. A coil component that has a closed magnetic circuit in the shape of a letter of V that is made by butt-joining and joining in two directions, with the surfaces being joint surfaces. 2. An I-shaped laminated core and a C-shaped laminated core are provided with an engaging projection on one of the tapered surfaces and an engaging recess on the other, and the engaging projection is engaged with the engaging recess. The coil component according to claim 1. 3. The coil component according to claim 1, wherein a space gap is formed by abutting the tapered surfaces of the I-shaped laminated core and the C-shaped laminated core.