JPH03250703A - Coil parts - Google Patents

Abstract

PURPOSE:To improve the electromagnetic coupling between a magnetic core and winding and absorb leakage fluxes so as to obtain coil parts having good electromagnetic characteristics by forming a bobbin used for the coil parts of a resin mixed with magnetic powder to a shape at which the winding can be brought into close contact with the bobbin. CONSTITUTION:A bobbin 2 is formed of a resin mixed with magnetic powder to a shape at which winding 3 can be brought into close contact with the bobbin 2. Namely, the bobbin 2 has a curved outer circumferential surface and a round cross section so that the winding 3 can be brought into close contact with the bobbin 2 and no air gap can be produced between them 2 and 3 when the winding 3 is wound around the bobbin 2. Moreover, since the magnetic powder is mixed in the bobbin 2 body, the powder improves the magnetic coupling between a magnetic core 1 and the winding 3 and absorbs leakage flux. Therefore, coil parts having good electromagnetic characteristics can be obtained, because the electromagnetic coupling between the core 1 and winding 3 is improved and leakage flux is absorbed.

Description

[Detailed description of the invention] [Industrial application field] This invention relates to coil components.

[Conventional technology]

FIG. 7 is a perspective view of an example of a conventional coil component, and FIG. 6 is an enlarged cross-sectional view of the same coil component.

As shown in both figures, this coil component has a ring-shaped magnetic core 11 attached to a resin bobbin 12, and a winding 12 attached to the ring-shaped magnetic core 11.
It has a structure with 3.

[Invention or problem to be solved]

However, in conventional coil parts, the cross-sectional shape of the magnetic core 11 is square, and the bobbin 12 is also square to match the stiffness, so when the winding 13 is applied to the bobbin 12,
Between the two 12 and 13, therefore, the magnetic core 11 and the winding 13
An air cap 14 is formed between the two. The reason why such an air cap 14 occurs is that it is difficult to bend the winding 13 at right angles and bring it into close contact with the bobbin 12.

For this reason, in conventional coil components, the existence of the air cap causes a problem in that the magnetic coupling between the magnetic core 11 and the winding 13 decreases, and leakage magnetic flux increases. Especially at high frequencies, this problem was unavoidable.

This invention was made in order to solve these conventional problems. It improves the electromagnetic coupling between the magnetic core and the winding, and absorbs leakage magnetic flux. Therefore, it is possible to create a coil component with good electromagnetic characteristics. The purpose is to provide

(Means for Solving the Problems) In the coil component according to the present invention, the hobbin constituting the coil component is made of a resin mixed with magnetic powder, and is formed into a shape that allows the windings to come into close contact with the coil component.

[Effect]

According to the above configuration, no air cap occurs between the hobbin and the winding, and thus between the magnetic core and the winding. Further, the magnetic powder mixed in the bobbin can improve the magnetic coupling between the magnetic core and the winding, and absorb leakage magnetic flux.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 2 shows the appearance of a coil component according to an embodiment, and FIG. 1 shows an enlarged cross section of the same coil component.

In the figure, 1 is a link-shaped magnetic core, 2 is a magnetic core 1
3 is the winding wire applied to the bobbin 2.

The hobbin 2 has a curved outer peripheral surface, and when viewed in cross section, the outer peripheral surface is round as shown in FIG.

The purpose of making the wire round in this way is to make the curvature of the winding wire 3 as close as possible to the curvature of the outer circumferential surface of the hobbin 2, so that both 2 and 3 are brought into close contact with each other. Further, the hobbin 2 is molded from resin mixed with magnetic powder. In this example, the mixing ratio of the magnetic powder is 50% by weight.

Next, the effect will be explained.

The hobbin 2 has a curved outer peripheral surface and is round in cross section. For this reason, Ichi I3 is Hobbin 2
When winding the wire around the winding 3 or the hobbin 2, the wire 2
．． No air cap is formed between the 3 parts.

Also, since magnetic powder is mixed in the hobbin 2,
This magnetic powder can improve the magnetic coupling between the magnetic core 1 and the winding 3 and absorb leakage magnetic flux.

In the above embodiment, a case has been described in which the configuration of the present invention is applied to a normal motor choke, but the same configuration can also be applied to other coil parts.

For example, as shown in FIG. 3, a coil component in which a hobbin 5 is attached to a U-shaped magnetic core 4 and a winding wire (not shown) is applied thereto, or as shown in FIG. A coil component in which a hobbin 7 is attached and a coil is wound (not shown) employs the structure of the present invention. In either case, the same effects as in the above embodiments are achieved. Further, the common mode choke 8 shown in FIG. 5 also adopts the configuration of the present invention, and produces the same effects as the above embodiment.

〔Effect of the invention〕

As described above, according to the present invention, the bobbin used for the coil component is made of magnetic powder mixed resin and has a shape that allows the winding to come into close contact with each other, so that the electromagnetic coupling between the magnetic core and the winding is improved. In addition, leakage magnetic flux can be absorbed, and thus a coil component with good electromagnetic properties can be obtained.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a coil component according to an embodiment of the present invention;
Figure 2 is a perspective view of the same coil component, Figures 3, 4 and 5 are front views of other embodiments, Figure 6 is a sectional view of the conventional coil component, and Figure 7 is the same coil component. FIG. 1 is a magnetic core, 2 is a bobbin, and 3 is a winding wire. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] A coil component in which a bobbin is attached to a magnetic core and a wire is wound around the bobbin, and the bobbin is made of a resin mixed with magnetic powder, and is formed in a shape that allows the winding to come into close contact with the bobbin. coil parts.