JP3362433B2 - Coil parts - Google Patents

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 used in various electronic devices have been required to be smaller, 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.

Hereinafter, a conventional coil component will be described with reference to FIGS.
This will be described with reference to FIG. In FIG. 12, the coil bobbin 2 wound with the coil 1 is mounted, and the I-shaped laminated core 3 is provided with triangular portions at both ends, and the I-shaped laminated core 3 is disposed at both ends of the I-shaped laminated core 3 and inside the ends of the magnetic legs on both sides. FIG. 11 shows a combination of the C-shaped laminated core 4 and the I-shaped laminated core 3 having tapered surfaces matching the triangular tapered surfaces at both ends.
As shown in (4), it was fixed by continuous welding 5.

[0004]

However, in the above configuration, as shown in FIG. 13, the I-shaped laminated core 3 having both ends formed in a triangular shape, and the I-shaped laminated core 3 arranged at both ends of the I-shaped laminated core 3 have both sides. When the C-shaped laminated core 4 having tapered surfaces matching the triangular tapered surfaces at both ends of the I-shaped laminated core 3 is combined inside the end of the magnetic leg and the tip 6a of the butted portion is fixed by continuous welding,
The tip 6a of the abutting portion has a processed shape with a tip R of about 0.1 to 0.5 due to factors such as durability of the press die when the laminate core is pressed.

Further, as shown in FIG. 14, when the tips of the butted portions are welded, the welded portion 6b has three butted portions.
As it is a point-joint type, if there is a positional deviation during welding, or if the laminate core melts insufficiently during welding, 2
It becomes the welding of the spots and causes the deterioration of the characteristics and the roaring noise of the core vibration. As shown in FIG.
In order to reliably weld the points, it is necessary to widen the welding beat width L1 like the welded portion 6c or deepen the welded depth L2, and at this time, the welded portion 6c flows through the closed magnetic path. The magnetic flux 7 is hindered, and there are various problems such as a decrease in magnetic field rotation efficiency and an increase in eddy current loss in the welded portion 6c.

Further, when a high grade core such as a grain oriented silicon steel sheet is used for the I-shaped laminated core 3 and a non-oriented silicon steel sheet is used for the C-shaped laminated core 4, welding is difficult because the materials are different.

The present invention solves the above problems, and an object of the present invention is to provide a coil component which has improved weldability and can suppress deterioration of characteristics due to welding to a minimum, thereby improving assemblability and productivity. It is what

[0008]

In order to achieve this object, the coil component of the present invention is provided with triangular parts I at both ends.
-Shaped laminated core and a pair of Cs with taper surfaces formed on both ends to match one side of the triangular portion of the I-shaped laminated core
When the I-shaped laminated core and this pair of C-shaped laminated cores are combined with the I-shaped laminated core, the tip of the triangular portion of the I-shaped laminated core protruding outward from the butted portion of the C-shaped laminated core is welded or I-shaped. The triangular core portion of the laminate core is located inward of the abutting portion of the C-shaped laminate core, and the abutting portion of the C-shaped laminated core is welded to form a closed V-shaped magnetic path.

[0009]

In this structure, the tips of the I-shaped laminated core having the triangular portions at both ends and the pair of C-shaped laminated cores having the tapered surfaces at the both ends which conform to one side of the triangular portion of the I-shaped laminated core are formed. When welding and fixing, it is possible to reduce the influence of the welding on the day-shaped closed magnetic circuit, and it is possible to realize high efficiency with low loss. Also,
Welding the tips of a pair of C-shaped laminated cores with the I-shaped laminated core sandwiched between them makes it possible to stably assemble, improve productivity and reduce loss with two-point bonding without degrading the characteristics of the I-shaped laminated core. It is also possible to improve characteristics such as low leakage magnetic flux.

[0010]

(Embodiment 1) An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of a coil component according to the first embodiment of the present invention. FIG. 2 is an exploded perspective view of the coil component according to the first embodiment of the present invention. In FIG. 1 and FIG. 2, an I-shaped laminated core 10 in which both ends of a coil bobbin 9 on which a coil 8 is wound and which is mounted in a substantially triangular shape is mounted.
And a pair of C-shaped laminated cores arranged at both ends of the I-shaped laminated core 10 and having tapered surfaces formed inside the ends of the magnetic legs on both sides to match the triangular tapered surfaces at both ends of the I-shaped laminated core 10. 11 and a welded portion at the tip of the triangular portion of the I-shaped laminated core 10 protruding outward from the butted portion of the C-shaped laminated core 11 when the pair of C-shaped laminated cores 11 are combined with the I-shaped laminated core 10. 10a is welded to form a closed V-shaped magnetic circuit to form a coil component.

The coil component constructed as described above will be described with reference to FIGS. FIG. 3 is a sectional view of a coil component showing an embodiment of the present invention. In FIG. 3, the I-shaped laminated core 10 whose both ends are formed in a substantially triangular shape is C
When the shape laminated cores 11 are combined, the welding protrusion 10a is formed so as to protrude outward from the abutting surface of the C type laminated core 11. Further, as shown in FIG. 4, the welding tip projection 10b of the I-shaped laminated core 10
May have a trapezoidal shape to improve weldability.

By welding the welding tip projections 10a and 10b of the I-shaped laminated core 10 having the shape shown in FIGS. 3 and 4, as shown in FIG. 5, the welding depth L of the welded portion 10c is obtained.
3 can be reduced to less than half of the conventional welding depth, and magnetic influences such as obstruction of the flow of magnetic flux to the day-shaped closed magnetic circuit due to welding can be minimized, and the welding portion 10c The eddy current loss is reduced, and the loss and the leakage magnetic flux can be reduced.

Further, as shown in FIG. 6, if the tip projection 12 of the I-shaped laminated core 10 is fixed in advance by laser beam welding, gas welding, or the like to form a block,
In addition to improving workability in terms of assembly, there is no deterioration of characteristics due to welding of the block portion, and if the trapezoidal protruding portions 13 of the I-shaped laminated core 10 as shown in FIG. It may be used because the tip is easily welded when it is made into blocks.

(Second Embodiment) A second embodiment of the present invention will be described below with reference to the drawings. 8 to 10 are sectional views of a coil component showing a second embodiment of the present invention. The basic configuration is similar to that of the first embodiment shown in FIG. In FIG. 8, an I-shaped laminated core 10 having substantially triangular portions at both ends, and a pair of C-shaped formed with tapered surfaces at both ends that match the tapered surfaces on one side of the substantially triangular portion of the I-shaped laminated core 10. When combined with the laminated core 11, C
The tip of the I-shaped laminated core 10 is located inward from the abutting portion 14 of the shaped laminated core 11.
At this time, the I-shaped laminated core 10 is sandwiched by the C-shaped laminated core 11, and the welded portion 15 is welded and fixed to the butt portion 14 of FIG. 8 as shown in FIG. A V-shaped closed magnetic circuit can be formed without degrading the characteristics of the core 10 by welding, and a coil component with low loss, easy welding work, and excellent productivity can be obtained.

If a high grade core such as grain oriented silicon steel is used for the I-shaped laminated core 10 and a non-oriented silicon steel sheet is used for the C-shaped laminated core 11, the C-shaped laminated core 11 also uses grain oriented silicon steel. The iron loss characteristics are the same, and the leakage flux can be reduced because a non-oriented silicon steel plate is used for the C-shaped laminated core 11, and the C-shaped laminated core 11 can be easily welded because it is a non-oriented silicon steel plate.

As for the shape of the butt portion, a straight line portion may be provided at the butt end of the C-shaped laminate core 11 such as the butt portion 14 shown in FIG. 9, and a flat butt shape may be used. There is no point in melting the core 10 to some extent.

[0018]

As described above, according to the present invention, the tip portion of the triangular portion of the I-shaped laminated core is positioned outside or inside of the butted portion of the C-shaped laminated core and the welding is performed. It is possible to improve characteristics such as loss reduction, low loss, high efficiency, and low leakage magnetic flux, and also to reduce loss and low leakage magnetic flux by changing the materials of the I-type laminate core and C-type laminate core. Improvement of welding workability,
It is possible to provide a coil component having high industrial value with stable quality and excellent productivity.

[Brief description of drawings]

FIG. 1 is a perspective view showing a coil component according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a coil component according to the first embodiment of the present invention.

FIG. 3 is a sectional view showing a coil component according to the first embodiment of the present invention.

FIG. 4 is a sectional view of a main part of a coil component of another example.

FIG. 5 is a sectional view of a main part after the welding.

FIG. 6 is an exploded perspective view showing a coil component of another embodiment of the first embodiment of the present invention.

FIG. 7 is an explanatory diagram of another example.

FIG. 8 is a cross-sectional view of a main part showing a coil component according to a second embodiment of the present invention.

FIG. 9 is a sectional view of the main part of the other example.

FIG. 10 is a sectional view of a main part after the welding.

FIG. 11 is a perspective view of a conventional coil component.

FIG. 12 is an exploded perspective view of a conventional coil component.

FIG. 13 is a cross-sectional view of a main part showing a part of a conventional coil component.

FIG. 14 is a sectional view of an essential part showing an inconvenient state of the coil component.

FIG. 15 is a sectional view of the main part in the same inconvenient state.

[Explanation of symbols]

8 coils 9 coil bobbins 10 I type laminated core 10a Welding protrusion 11 C type laminated core

Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H01F 27/245

Claims (3)

(57) [Claims] 1. An I-shaped laminated core having triangular portions at both ends thereof, and a pair of Cs having tapered surfaces at both ends which match the tapered surfaces on one side of the triangular portion of the I-shaped laminated core.
When the I-shaped laminated core and this pair of C-shaped laminated cores are combined with the I-shaped laminated core, the tip of the triangular portion of the I-shaped laminated core protruding outward from the butted portion of the C-shaped laminated core is welded A coil component that forms a letter-shaped closed magnetic circuit, and a coil is attached to this closed magnetic circuit. 2. An I-shaped laminated core having triangular portions at both ends thereof, and a pair of Cs having tapered surfaces at both ends thereof, the tapered surfaces corresponding to one tapered surface of the triangular portion of the I-shaped laminated core.
When the C-shaped laminated core and this pair of C-shaped laminated cores are combined with the I-shaped laminated core, the C-shaped laminated core is positioned inward of the butted portion of the C-shaped laminated core and the butted portion of the C-shaped laminated core is welded A coil component that constitutes a closed magnetic circuit of and a coil is mounted on this closed magnetic circuit. 3. A material for the I-shaped laminated core and the C-shaped laminated core are changed, and a butted portion of the C-shaped laminated core is welded to form a sunken-shaped closed magnetic circuit, and a coil is attached to this closed magnetic circuit. Item 2. The coil component according to item 2.