JPH10308316A - Transformer and transformer core - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dispense with waste material when material is punched out, and to make it possible to incorporate the lapped stack of cores, by a method wherein the plane-formed silicon steel plate to be stacked is substantially formed into a J-shaped. SOLUTION: The Fig. 1 is a plan showing the punching state of a core (silicon steel plate). This core has an almost J-shape when viewed horizontally. When a pair of J-shaped cores 4 and 4 are assembled, they form a rectangle even in the case of an oriented silicon steel plate, waste material can be eliminated, and a lap incorporation can be made possible. As a result, there is no magnetic loss in a transformer, the waste punching material is eliminated by having the J-shaped core 4, and the cost of material can be cut down.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer using a stacked silicon steel sheet as an iron core, and more particularly, to a core which not only can reduce the cost of the silicon steel sheet but also enables the lamination and incorporation without deteriorating the magnetic characteristics. It is about shape.

[0002]

2. Description of the Related Art FIGS. 3 (a) and 3 (b) are views showing a conventional butting and assembling structure of a core. FIG. 3 (a) is a perspective view of the core being assembled, and FIG.

[0003] Reference numeral 1 in the figure denotes an E-shaped butting core. The butting portions 1a of the E-shaped core 1 are butted against each other, so that the E-shaped core 1 is assembled and joined.

FIGS. 4A and 4B are views showing a conventional core wrap assembling structure, in which FIG. 4A is a perspective view during the assembling of the core and FIG. 4B is a front view after the assembling is completed.

In the drawing, reference numeral 2 denotes an E-shaped core for wrapping, and 3 denotes an E-shaped core or an I-shaped core for wrapping, which is shown in FIG. Wrap integration is performed as follows.

As described above, conventionally, a silicon steel plate is stacked on a coil bobbin to form an embedded iron core, but E-shaped cores are butt-fitted and wrapped, or E-shaped and I-shaped cores are wrapped.

[0007] In order to reduce the input current and obtain a transformer with high conversion efficiency, it is necessary to prevent the magnetic characteristics from being impaired by incorporating a silicon steel plate.

Here, an E-shaped core 1 as shown in FIG.
In the case of one-by-one assembly, butting part 1
A gap is created between a and 1a, thereby reducing the inductance.

On the other hand, in the case of the wrap as shown in FIG. 4, there is a feature that the leakage of the magnetic flux in the gap can be suppressed and the loss of the magnetic characteristics can be prevented.

[0010]

However, in the conventional structure, there is a problem that when the E-shaped core is punched out of the directional silicon steel sheet, a portion where the material is discarded is formed. That is, the silicon steel sheet is manufactured by punching from a rolled material. In the case of a directional silicon steel sheet in which the direction of the axis of easy magnetization of the crystal is aligned with the roll direction, when punching the E-shaped core, reference numeral 2 'in FIG. The portion shown is discarded, which has the disadvantage of increasing the material cost.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a transformer and a transformer core which can solve the above-mentioned drawbacks of the prior art and eliminate the waste of material at the time of punching and can incorporate a core wrapped stack. is there.

[0012]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a transformer having a coil bobbin on which a coil is wound and an iron core of a silicon steel sheet inserted into the coil bobbin in a stacked state. By a first means having a substantially J-shape.

Further, in a transformer core made of silicon steel sheets inserted in a stacked state into a coil bobbin of the transformer, the present invention is achieved by a second means in which the planar shape of the stacked silicon steel sheets is substantially J-shaped.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As described above, according to the present invention, a silicon steel plate serving as a core has a substantially J-shaped planar shape, so that a wrap stack can be incorporated and a transformer with high conversion efficiency can be obtained. In addition, material waste at the time of punching can be eliminated, and the cost of the core can be reduced.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of a core punched state according to an embodiment of the present invention. 2A and 2B are views showing a mounting structure using the core shown in FIG. 1, wherein FIG. 2A is a perspective view during the mounting of the core, and FIG. 2B is a front view after the mounting is completed.

The core (silicon steel sheet) of the present invention is shown in FIGS.
As shown in (a), it is substantially J-shaped when viewed from a plane. As shown in FIG. 1, the J-shaped core 4 becomes a rectangle when a pair of J-shaped cores 4 and 4 are combined, even in the case of a grain-oriented silicon steel sheet, so that the punched material can be discarded, and as shown in FIG. 2. It is possible to incorporate it into a wrap.

As described above, according to the present embodiment, since the core can be wrapped and incorporated, there is no loss in the magnetic properties of the transformer, and the use of the J-shaped core 4 eliminates waste of punching material, thereby reducing material costs. Cost can be reduced.

[0018]

As described above, according to the present invention, J
The adoption of the letter-shaped core has the characteristics that the wrap can be incorporated, the magnetic properties of the transformer can be secured, and the material cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a plan view of a core punched state according to an embodiment of the present invention.

FIG. 2 is a view showing a built-in structure using a core shown in FIG. 1;

FIG. 3 is a view showing a conventional butted and assembled structure of cores.

FIG. 4 is a view showing a conventional wrap-in structure of a core.

FIG. 5 is a plan view of a core punched state according to the prior art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 E-shaped core for butting 1a Butted part 2 E-shaped core for embedding wrap 2 'Material discarded part 3 E-shaped core or I-shaped core for embedding wrap 4 J-shaped core

Claims (2)

[Claims] 1. A transformer having a coil bobbin on which a coil is wound and a silicon steel core inserted into the coil bobbin in a laminated state, wherein the planar shape of the laminated silicon steel plate is substantially J-shaped. A featured transformer. 2. A transformer core made of silicon steel sheets inserted in a stacked state into a coil bobbin of a transformer, wherein the planar shape of the stacked silicon steel sheets is substantially J-shaped.