JPH0333045Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a bobbin for coils related to the internal structure of electromagnetic noise prevention parts used in electronic equipment, etc. This relates to the bobbin shape of a coil with a large current capacity.

[Conventional technology]

Figure 2 is a diagram explaining a coil with a large current capacity that combines H-shaped cores, and shows the structure of the coil when a conventional coil bobbin is not used. Figure 3 shows the structure of the coil when the core is assembled. FIG. 2 is a diagram of the completed coil. The coil 8 is wound a plurality of times, and an I-shaped ferrite core 71 is passed through the space inside the coil, and I-shaped ferrite cores 72 are also installed on the left and right sides of the coil. After making contact with the I-shaped ferrite core that penetrates the space and making it into an H-shaped mold, wrap the outer circumference of the core assembled in the H-shape with polyester tape about 3 or 4 times, and then mold it into an H-shape. The ivy ferrite core was fixed. For this reason, even if the ferrite core that penetrates the hollow part of the coil is subjected to some vibration, the cores combined in an H shape may shift or the core may crack, resulting in a lack of reliability. Because the ferrite core was fixed by turning the outer circumference of the core, there were problems such as the amount of man-hours required to assemble the coil.

[Problems that this invention attempts to solve]

In a conventional coil with a large current capacity using an H-shaped core, conventional technology uses an I-shaped ferrite core that penetrates the space inside the coil and an I-shaped ferrite core installed on the left and right parts of the coil. After the cores are brought into contact and shaped into an H-shape, the ferrite cores are fixed by wrapping the tape three or four times around the outer circumference of the H-shaped ferrite cores, which requires a lot of man-hours. There are also problems such as the I-shaped ferrite core passing through the inner space of the coil slipping off or becoming loose due to slight vibration.
When the core slips down, there is a problem that the insulation distance between the coil winding part and the core cannot be maintained.

[Means for solving problems]

The present invention uses a ferrite core formed by processing a ferrite core into an H-shape in advance and sintering it, or
H made by press-forming fine powder of metal magnetic alloy
After installing the H-shaped core in the central groove that accommodates the core of the coil bobbin, which is divided into two halves with flanges at both ends and has a convex part and a concave part for fitting, the shaped powder magnetic core is divided. The convex portion and concave portion of the bobbin are fitted to fix the combined H-shaped core. In addition, the coil bobbin has enough wall thickness to maintain the insulation distance after coil winding, and the bobbin is molded using resin with electrical insulation properties, making core assembly and coil molding operations easy. It can be done at a low cost because it can be carried out in the same way, and since the H-shaped core is also integrally molded, there is no possibility of core misalignment compared to the conventional core structure where I-shaped cores are combined to form an H-shaped core. reliability can also be improved.

〔Example〕

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

FIG. 1 shows a coil bobbin according to the present invention using an H-shaped core. The coil bobbins 11 and 12 shown in FIG. 1 are divided into two parts,
Each is provided with a convex portion 2 and a concave portion 3, the details of which are shown in sections A and B. Grooves 41 and 42 for storing the H-shaped core 6 are provided in the center of the two-divided bobbin, and flanges 101, 102, 103, and 104 are attached to each bobbin. The diameter of the bobbin collar and the length of both ends of the H-shaped core are designed to be approximately the same length. Insert the horizontal part of the H-shaped core 6 into the grooves 41 and 42 at the center of the bobbin, temporarily fix the core, combine the convex part 2 of the coil bobbin 1 divided into two parts and the tank 3, fit them together, and The coil bobbin 1 is molded with electrically insulating resin, and the insulation distance after winding is the bobbin thick part 5.
and the thickness of the tsuba are taken into consideration. After storing the H-shaped core in a bobbin and combining the two divided bobbins, winding is performed at the center of the bobbin to form a coil for a noise prevention component.

[Effect of idea]

With the structure of this invention, there is no core slippage, which was a drawback of conventional structures, and since a two-part coil bobbin is used, the coil assembly process is easy and can be provided at low cost. It is something. Furthermore, although the present invention has been mainly described with reference to an H-shaped core using a ferrite core, it is of course possible to use a powder magnetic core formed into an H-shape as described above.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the structure of a coil bobbin according to the present invention. A is a detailed view of the fitting convex part. B is a detailed view of the fitting recess. FIG. 2 is a diagram showing a conventional coil structure. Figure 3 is an assembly diagram of a coil with a conventional structure. 11, 12... Coil bobbin, 2... Convex portion, 3... Non-concave portion, 41, 42... Core fixing groove, 5... Thick part, 6... H-shaped core, 71, 7
2... I-shaped ferrite core, 8... Coil, 9
...Lug terminal (copper tube terminal), 101, 102, 1
03,104...Tsuba.

Claims (1)

[Scope of utility model registration request] In a noise prevention coil with a large current capacity that is formed using an H-shaped core, it is divided into two by using an H-shaped core that has been integrally formed in advance and a two-part coil bobbin that has flanges at both ends. The coil bobbin is provided with a convex portion and a concave portion, and each coil bobbin is provided with a groove for fixing an H-shaped core, and after inserting the H-shaped core into the groove portion. A coil bobbin constructed using an H-shaped core, characterized in that a convex portion and a concave portion of a coil bobbin divided into two are fitted into each other.