JPH07230919A - Coil component - Google Patents

Abstract

PURPOSE:To provide a small-size coil component in which a rectangular narrow core with an enclosed magnetic path is formed easily and a coil is easy to wind. CONSTITUTION:A closed magnetic path core 10 is made up of a long rectangular frame core 12 and an I-shaped core 14 that bridges a space between both short sides of the frame core 12. A fitting groove with a rectangular shape in cross section is formed at the center across each short side of the frame core 12. In a manufacturing step for an coil component, a winding 16 is formed by turning a wire directly around the I-shaped core 14 and both ends of the I- shaped core 14 is mounted fixedly in the fitting grooves.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to winding parts used for transformers, choke coils and the like. More specifically, the present invention relates to a winding component including a closed magnetic circuit core formed by combining an elongated rectangular frame-shaped core and an I-shaped core installed between short side portions thereof, and a winding formed on the I-shaped core. It is a thing.

[0002]

2. Description of the Related Art Generally, a closed magnetic circuit core used for a transformer, a choke coil or the like has two Es made of ferrite.
It is composed of a combination of shaped cores or a combination of E-shaped cores and I-shaped cores. These cores are manufactured by filling ferrite powder in a predetermined die, press-molding and firing. A winding component using such a closed magnetic circuit core is configured by mounting a coil bobbin having a winding on the middle leg of the E-shaped core.

[0003]

In recent years, the winding parts have been made thinner and smaller, and an elongated closed magnetic circuit core has been demanded depending on the application and the state of use. For example, in a high-voltage transformer for inverters, etc., a high voltage is generated in the secondary winding, so from the viewpoint of ensuring insulation and withstand voltage performance, it is desirable to make the secondary winding with many turns a single layer winding or a winding state close to that. There is a request. However, since the E-shaped core is used in the closed magnetic circuit core having the conventional structure, each leg portion becomes very long and slender when an elongated shape is attempted. Then, when baking, E
Since the shaped core is deformed, it is difficult to manufacture a substantially elongated closed magnetic circuit core. In addition, in the above-described usage mode, the distance between the middle leg portion and the outer leg portion of the E-shaped core may be such that winding can be performed, but in reality, due to restrictions in mold processing and press molding, A certain space (minimum 2 mm) was required, and there was a limit to miniaturization. Further, it is very difficult to directly wind the middle foot because the two outer feet are obstacles.

As another type of the closed magnetic circuit core,
A structure in which an elongated rectangular frame-shaped core and an I-shaped core are combined and both end surfaces of the I-shaped core are joined to the inner surface of the short side portion of the frame-shaped core is conceivable. However, in this type, strict dimensional accuracy is required in order to bring both end surfaces of the I-shaped core into contact with the inner surface of the short side portion of the frame-shaped core, resulting in a drawback that processing is difficult.

An object of the present invention is to provide a winding component which can easily form an elongated closed magnetic circuit core and can be easily wound and which can be miniaturized.

[0006]

According to the present invention, there is provided a closed magnetic circuit core formed by combining an elongated rectangular frame-shaped core and an I-shaped core installed between short side portions thereof, and a winding applied to the I-shaped core. It is a winding part consisting of a wire. Here, a mounting groove is provided substantially in the center of one surface of both short side portions of the frame-shaped core which face each other, and both ends of the I-shaped core are placed and fixed in the mounting groove.

Further, a resin coil bobbin having the closed magnetic circuit core, a winding core portion for accommodating the I-shaped core, and a terminal connecting portion for holding a plurality of connection terminals, and a winding wire formed on the winding core portion It may be configured as follows. In that case, an opening for exposing the end of the I-shaped core is provided at least near both ends of the winding core. Then, the I-shaped core is placed and fixed in the mounting groove so that the exposed surfaces of both ends of the I-shaped core come into contact with the bottom surface of the mounting groove formed in the frame-shaped core. Alternatively, the I-shaped core may be insert-molded on the coil bobbin.

[0008]

The frame-shaped core and the I-shaped core are not asymmetrical shapes like the E-shaped core, but are longitudinally and laterally symmetric shapes, so that deformation such as warpage or spread is less likely to occur during firing. The characteristics of the winding parts are affected by the abutting state of the frame-shaped core and the I-shaped core, and the size of the abutting surface. The contact state and the necessary contact area can be secured. Therefore, strict dimensional accuracy is not required for the width and depth of the mounting groove, and the length of the I-shaped core may be longer than the length of the frame-shaped core in the longitudinal direction. Thus, the elongated closed magnetic circuit core can be easily constructed. In addition, workability is good because the I-shaped core may be wound before being combined with the frame-shaped core. Since the closed magnetic circuit core of the present invention has a configuration in which the I-shaped core is installed between the short side portions of the frame-shaped core, it is integrally formed together with the middle foot portion to be wound like the E-shaped core. Differently, the gap between the inner surface of the frame-shaped core and the I-shaped core is free from restrictions in die processing and press molding, and the gap can be freely set. Therefore, the size of the frame-shaped core can be reduced by reducing the width of the frame-shaped core to such an extent that the clearance required for winding can be secured.

[0009]

1 is a perspective view showing an embodiment of a winding component according to the present invention, and FIG. 2 is an assembled perspective view thereof. The closed magnetic circuit core 10 used in this winding component has a structure in which an elongated rectangular frame-shaped core 12 and an I-shaped core 14 extending between the short sides thereof are combined. Here, a mounting groove 18 having a rectangular cross-section is provided so as to traverse the short sides at substantially the center of the upper surfaces of the opposite short sides of the frame-shaped core 12. As for the winding component, the winding 16 is directly applied to the I-shaped core 14,
It is assembled by mounting and fixing both ends of the I-shaped core 14 in the mounting groove 18 of the frame-shaped core 12. An insulating coating or the like is formed on the surface of the I-shaped core, if necessary. In that case, the core material is exposed at both ends, and the exposed portion abuts the mounting groove. Frame-shaped core 12 and I
The core 14 may be fixed by fitting, but in order to securely fix it, an adhesive is used or it is sandwiched by metal fittings.

The size of the mounting groove 18 may be the same as or slightly larger than the width of the I-shaped core 14. This is because the characteristics of the winding parts are such that the mounting groove 18 and the I-shaped core 14 are in contact with each other,
In addition, since the contact area is affected, even if there is a slight gap on the side surface side of the I-shaped core 14, there is no problem in characteristics as long as a sufficient contact area is secured. Also, there is no restriction on the depth of the groove from the viewpoint of the characteristic of the winding, and even if the upper surface of the I-shaped core 14 is higher or lower than the upper surface of the frame-shaped core 12 when the I-shaped core 14 is combined. Good. However, for a thin product, it is preferable to set the groove depth such that the upper surface of the I-shaped core 14 is lower than the upper surface of the frame-shaped core 12. The length of the I-shaped core 14 is preferably set to be the same as the length of the frame-shaped core 12, but it is slightly longer, and even if it protrudes from the frame-shaped core when combined, there is no problem in terms of characteristics.

The closed magnetic circuit core 10 is made of a ferrite material. Ferrite powder is filled in a mold having a predetermined shape, press-molded and fired. Frame-shaped core 12 and I-shaped core 14
Has a shape that is vertically and horizontally symmetrical, so that deformation such as warpage during firing is unlikely to occur. Moreover, since it is only necessary to manufacture a core having a very simple shape, it is inexpensive.

FIG. 3 is an assembled perspective view showing another example of the closed magnetic circuit core. This is because the height of the I-shaped core 24 is the frame-shaped core 22.
It is an example of the closed magnetic circuit core 20 which is about the same as the height. The I-shaped core 24 is stepped so that only the both ends have a height substantially equal to the depth of the mounting groove 28 of the frame-shaped core 22. In this structure, since the width of the frame-shaped core 22 can be narrowed by the width of the I-shaped core 24, the size can be reduced. Further, if the width of the frame-shaped core 22 is not changed, the gap between the frame-shaped core 22 and the I-shaped core 24 is widened, and the winding space becomes larger.

FIG. 4 is a perspective view showing another embodiment of the winding component according to the present invention, and FIG. 5 is an assembled perspective view thereof. This winding component includes a closed magnetic circuit core 30, a winding 36, and a coil bobbin 40. The closed magnetic circuit core 30 has a structure in which an elongated rectangular frame-shaped core 32 and an I-shaped core 34 extending between the short sides thereof are combined in a manner similar to that described above. In this case as well, the mounting groove 38 is provided substantially at the center of the upper surfaces of the opposite short sides of the frame-shaped core 32. The coil bobbin 40 is made of resin, has a winding core 42 and terminal connecting portions 44 arranged on the lower surfaces of both ends thereof, and integrally connects these so as to hold a plurality of connecting terminals 46 on the lower surface of the terminal connecting portion. It is molded into. The winding core 42 is a prism having a hollow portion capable of accommodating the I-shaped core 34, and openings 48 are formed at both ends of the upper surface thereof so that both ends of the accommodated I-shaped core 34 are exposed. There is.

In the winding component, the I-shaped core 34 is housed in the bobbin 40 to form the winding 36, and the I-shaped core 34 is mounted so that the exposed surface of the I-shaped core 34 abuts the bottom surface of the mounting groove 38. It is configured by being mounted and fixed in the groove 38. The winding terminal is entwined with the connection terminal 46 of the terminal connection portion 44 and soldered.

FIG. 6 is a partial assembly perspective view showing still another embodiment of the winding component according to the present invention. The feature of this embodiment lies in the structure of the coil bobbin 50. Coil bobbin 50
Comprises a winding core portion 52 having a U-shaped cross section and a terminal connecting portion 54 having a plurality of connecting terminals 56. The I-shaped core 34 is housed in the winding core portion 52 such that the lower surface of the I-shaped core 34 contacts the inner bottom surface of the winding core portion 52. Since the upper side of the winding core 52 is open, it is not necessary to intentionally provide an opening for attaching the frame-shaped core and the I-shaped core as in the above-described example.

FIG. 7 is a perspective view showing a core-coil bobbin composite used in the present invention. The I-shaped core 64 is insert-molded on the coil bobbin 60 to manufacture the core-coil bobbin composite 68. The outer periphery of the I-shaped core 64 is covered with resin except the upper surfaces of both ends thereof. This is just the same as the shape in which the I-shaped core 34 is housed in the coil bobbin 40 shown in FIG.

The present invention is not limited to such a configuration. The terminal connecting portion of the coil bobbin may be arranged not only at both ends of the winding core portion but also at the intermediate portion. Further, the number is not limited to two, and includes a case where a plurality is formed.

[0018]

According to the present invention, the closed magnetic circuit core is a frame-shaped core and an I-shaped core.
Since it is configured with a shaped core, it is not easily deformed during firing, and since the I-shaped core is mounted and fixed in the mounting groove of the frame-shaped core, strict dimensional accuracy is not required, and a closed magnetic circuit core can be manufactured very easily. . In addition, there is no restriction on die processing or press molding, and the interval between the I-shaped core and the frame-shaped core, which is the winding frame width of the winding, can be freely set, and the size can be reduced. Furthermore, since the winding is applied to the I-shaped core and then combined with the frame-shaped core,
Work is easy even when winding directly. Further, since the I-shaped core is constructed so as to be installed between the short side portions of the frame-shaped core, a good contact state can be obtained between the I-shaped core and the frame-shaped core, and a necessary contact area can be secured. A winding part with good characteristics can be obtained.

[Brief description of drawings]

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

FIG. 2 is an assembled perspective view thereof.

FIG. 3 is an assembled perspective view showing another example of the closed magnetic circuit core used in the present invention.

FIG. 4 is a perspective view showing another embodiment of the winding component according to the present invention.

FIG. 5 is an assembled perspective view thereof.

FIG. 6 is an assembled perspective view showing another example of the I-shaped core and the coil bobbin used in the present invention.

FIG. 7 is a perspective view showing a core-coil bobbin composite used in the present invention.

[Explanation of symbols]

 10 Closed magnetic circuit core 12 Frame-shaped core 14 I-shaped core 16 Winding 18 Mounting groove

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masaru Shinoda 5-36-11 Shimbashi, Minato-ku, Tokyo Inside Fuji Electric Chemical Co., Ltd.

Claims (3)

[Claims] 1. A closed magnetic circuit core comprising a combination of an elongated rectangular frame-shaped core and an I-shaped core installed between its short sides,
The I-shaped core is provided with a winding, and a mounting groove is provided in substantially the central portion of one surface of each of the opposite short side portions of the frame-shaped core, and both end portions of the I-shaped core are provided in the mounting groove. Winding parts characterized by mounting and fixing. 2. A closed magnetic circuit core formed by combining an elongated rectangular frame-shaped core and an I-shaped core installed between the short side portions thereof,
A resin coil bobbin having a winding core portion that accommodates the I-shaped core and a terminal connecting portion that holds a plurality of connection terminals, and a winding wire applied to the winding core portion, and the frame-shaped cores face each other. A mounting groove is provided substantially in the center of one surface of both short sides, and an opening for exposing the ends of the I-shaped core is provided at least near both ends of the winding core to expose both ends of the I-shaped core. A winding component, wherein the I-shaped core is mounted and fixed in the mounting groove such that the surface of the core contacts the bottom surface of the mounting groove. 3. The winding component according to claim 2, wherein the I-shaped core is insert-molded on the coil bobbin.