JP2003217938A - Core for wire-wound component - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem of the shape of a one-body mold core becoming too complicated to mold, ending up in high costs, and work not being a simple work to meet the requirements, when the electromagnetic coupling specifications are changed between the coils of a transformer, because the molding dies have to be newly made each time for the core 10. <P>SOLUTION: The core 10 for a wire wound component consists of a base plate 15 and projections 11, 12 molded separately and stuck on the plate, and each pieces are made of different materials. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a core made of a magnetic material used for winding parts such as small transformers such as inverter transformers and inductors.

[0002]

2. Description of the Related Art FIG. 6 is a sectional view showing an example of the structure of an inverter transformer. U-shaped cross-section core 10 and flat core
20 are butted against each other to form a closed magnetic circuit. core
The base 10 has a flat plate-shaped base portion 15 and two projecting portions 11 and 12 formed integrally with the base portion 15. The protrusion 11 is inserted in the center of the primary winding 1 wound around the resin bobbin 3, and the protrusion 11 is inserted in the center of the secondary winding 2 wound around the bobbin 4.
12 is inserted. As the U-shaped core and the E-shaped core having the protrusions 11 and 12 like the core 10, those integrally molded are conventionally used.

[0003]

However, there is a problem that the core formed by integral molding has a complicated shape and is difficult to mold, resulting in high cost. Further, since the shape and dimensions are fixed by integral molding, it is difficult to change the degree of electromagnetic coupling between the primary winding 1 and the secondary winding 2 when used in the transformer of FIG. there were. Therefore, in the case where the specification of the degree of coupling is changed, it has conventionally been dealt with by changing the molding die of the core 10. An object of the present invention is to make it possible to manufacture a core for a winding component at a low cost, and to provide a core structure that can easily cope with a change in coupling degree of a transformer.

[0004]

SUMMARY OF THE INVENTION According to the present invention, in a winding component core having a plate-shaped base portion and a protrusion portion protruding from the base portion, the separately formed protrusion portion and the base portion member are fixed to each other. It is characterized by the configuration.

[0005]

1 and 2 show an embodiment of a core 10 for a transformer. The core 10 is composed of a flat plate-shaped base portion 15 and two cylindrical protrusion portions 11 and 12, which are separately molded,
The two protruding portions 11 and 12 are fixed to the upper surface of the base portion 15 with an adhesive, respectively.

FIG. 3 shows another embodiment of the core 10 for a transformer, which is an example in which a step is formed on the upper surface of the base portion 15 to provide two horizontal planes 15a and 15b having a difference in height. is there. Separately molded columnar or prismatic protrusions 11 are bonded on one horizontal surface 15a, and similar separately molded protrusions 12 are fixed on the other horizontal surface 15b. Even when the shape of the core 10 is complicated as described above, it is better to mold the base portion 15 and the protruding portions 11 and 12 separately rather than integrally molding them.
Manufacturing of 10 becomes easier.

FIGS. 4 and 5 show another embodiment of the core 10 for a transformer, which has three protrusions.
Here are 10 examples. A prismatic protrusion that is inserted in the center of the winding
In addition to 11 and the columnar protrusion 12, a protrusion 13 for coupling adjustment is provided between the primary winding and the secondary winding when completed as a transformer. The three protrusions 11, 12, and 13 are separately molded, and are bonded and fixed to the upper surface of the flat plate-shaped base portion 15.

Since the winding component core of the present invention has the above-described structure, the material is made different between the plate-shaped base portion and the protruding portion fixed to the base portion, or between the plurality of protruding portions. It's also easy. For example, the core can be formed by combining a base portion made of a conductive magnetic material and a protruding portion made of an insulating magnetic material, or by combining magnetic members having different magnetic permeability.

[0009]

According to the present invention, even a core having a complicated shape can be easily molded, the manufacturing cost of the core can be reduced, and the material can be partially changed. Also,
When used in a transformer, the position of the protrusion inserted in the center of the primary winding or secondary winding can be changed before fixing it to the base, so the degree of electromagnetic coupling between the primary winding and the secondary winding can be reduced. There is also an advantage that even transformers with different specifications can be handled without making new molding dies.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a first embodiment of a core of the present invention.

FIG. 2 is a perspective view of the finished product of the core.

FIG. 3 is a front sectional view showing a second embodiment of the present invention.

FIG. 4 is an exploded perspective view showing a third embodiment of the present invention.

FIG. 5 is a perspective view of the finished product of the core.

FIG. 6 is a front sectional view of a conventional inverter transformer.

[Explanation of symbols]

10 core 11 Projection 12 Projection 15 Base

Claims (4)

[Claims] 1. A winding component core having a plate-shaped base portion and a protruding portion protruding from the base portion, wherein the separately formed protruding portion and base member are fixed to each other. A core for winding parts. 2. The winding component core according to claim 1, wherein members made of different magnetic materials are combined. 3. The winding component core according to claim 1, wherein a step is formed on the upper surface of the base portion to provide two horizontal planes having a height difference, and different projecting portions are fixed to the respective horizontal planes. 4. The core for a winding component according to claim 1, further comprising two protrusions which are respectively inserted into the center of the primary winding and the center of the secondary winding of the transformer.