JPH09237717A - Common mode choke coil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make easy the assembling of a common mode choke coil and reduce its size by housing a core having winding partitions and openings to fix ends of windings and fixing the ends of the windings formed thereon to the openings. SOLUTION: A core case 1a has partitions 2a at the center to electrically insulate three windings and six fixtures 4a, two each at both ends of each partition 2a. The fixtures have notched openings 3a and are formed integratedly with the case 1a. Or, windings 5 are wound on sections separated by the partitions 2a and ends 15 of the windings 5 are fitted into the openings 3a of the fixtures 4a to complete a common mode choke coil. The fixtures may be integrated with the partitions.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a common mode choke coil used in a noise filter circuit, and more particularly to a structure for fixing its lead terminal.

[0002]

2. Description of the Related Art A conventional common mode choke coil is:
As shown in the exploded perspective view of FIG. 4, a core case 1 having a partition 2 in the center for electrically insulating between two windings
, A toroidal core (not shown) made of a magnetic material is housed therein, a winding 5 is wound around each part divided by the partition 2, and an end 15 of this winding 5 is inserted into a hole 7 of the fixed base 4. In addition, the core case 1
Is assembled by fitting the bottom part of the.

[0003]

However, in the conventional common mode choke coil, a fixed base must be used in order to keep the distance between the terminals constant. Therefore, the number of parts is large and the assembly work time is long. There were many drawbacks.

Further, since the fixing base is additionally provided, the height of the common mode choke coil itself becomes high, which hinders downsizing of products using the common mode choke coil.

Further, when a hard material is used for the wire rod, when the drawn terminal is bent, it is supported midway and it is difficult to insert a plurality of terminals into a plurality of holes of the fixing base. It was

It is an object of the present invention to obviate these disadvantages,
It is to provide a small-sized common mode choke coil which is easy to assemble.

[0007]

SUMMARY OF THE INVENTION The present invention comprises a partition for insulation between windings and a fixing piece having a diametrically outwardly projecting opening for fixing the end of the winding. The toroidal core is stored in the provided core case, winding is applied,
The common mode choke coil is characterized in that an end of the winding is fixed to the opening.

Further, the present invention is the above common mode choke coil, wherein the fixing piece is integrated with the partition.

As described above, the fixing piece for fixing the terminal is
By providing it in the core case, the distance between the terminals becomes constant without using a conventional fixing base. Moreover, since the fixing piece has the opening portion whose tip can be opened flexibly, the terminal can be fixed easily even when the wire is thick and hard. Further, since the fixed base is eliminated, the common mode choke coil itself is downsized, and the product using the common mode choke coil can be downsized.

Further, by making the height (thickness) of the fixing piece higher than the diameter of the winding, when the common mode choke coil is installed on the substrate, the fixing piece serves as a pedestal and can be stably fixed. Therefore, the vibration of the choke coil can be prevented. It is also possible to adjust the distance between the common mode choke coil and the substrate by changing the height of the fixing piece.

Further, the strength of the fixing piece is increased by integrating the fixing piece with a partition for electrically insulating a plurality of windings.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment) FIG. 2 shows a core case used in a common mode choke coil according to an embodiment of the present invention. As shown in FIG. 2, the core case 1a is provided with a partition 2a at the center for electrically insulating the three windings. Further, a total of six fixing pieces 4a are provided on each of two sides of the three partition plates 2a. The fixed piece 4a is formed with a notched opening 3a. The fixed piece 4a is manufactured by integrally molding with the core case 1a.

FIG. 1 shows a common mode choke coil according to an embodiment of the present invention in which a winding 5 is wound around the core case 1a shown in FIG. As shown in FIG. 1, the winding 5 is attached to the core case 1a.
Is wound around each part divided by the partition 2a, and each end 15 of each winding 5 is fitted into the opening 3a of each fixing piece 4a to complete the common mode choke coil of the present invention.

Further, in the common mode choke coil of the present invention, as shown in the core case 1b of FIG. 3, it is possible to integrate a plurality of fixing pieces with a plurality of partitions 2b.

In this embodiment, the common mode choke coil used in the three-phase circuit has been described, but the present invention is also applicable to the common mode choke coil used in the two-phase (single-phase) circuit.

[0017]

According to the present invention, it is possible to provide a small-sized common mode choke coil which is easy to assemble.

[Brief description of drawings]

FIG. 1 is an external perspective view of a common mode choke coil according to an embodiment of the present invention.

FIG. 2 is an external perspective view of a core case used for the common mode choke coil according to the embodiment of the present invention.

FIG. 3 is an external perspective view of a core case in which a fixing piece used in a common mode choke coil according to another embodiment of the present invention is integrated with a partition.

FIG. 4 is an exploded perspective view of a conventional common mode choke coil.

[Explanation of Codes] 1, 1a, 1b Core case 2, 2a Partition 2b (with fixing piece) Partition 3a, 3b Opening 4 Fixing base 4a Fixing piece 5 Winding 7 Hole 8 Recess 15 End

Claims (2)

[Claims] 1. A toroidal core is provided in a core case provided with a partition for insulation between windings and a fixing piece which is bulged outward in a diameter direction and has an opening for fixing an end of the winding. A common mode choke coil, characterized in that it is housed, a winding is applied, and an end of the winding is fixed to the opening. 2. The common mode choke coil according to claim 1, wherein the fixing piece is integrated with the partition.