JPH10294220A - Laminate core constituting closed magnetic circuit in theta shape - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laminate core inexpensively which constitutes a closed magnetic circuit shaped like θ having superior electric characteristics and not requiring a weld process. SOLUTION: This laminate core constitutes a closed magnetic circuit shaped like θ, in which an E block E1 having silicon steel plates layered to provide taper joint faces a1, a2 at the outside of external magnetic pole parts at both sides and a male V-shaped taper joint face (c) at a central magnetic pole part is butted to an E block E2 having silicon steel plates layered to provide taper joint faces a1, a2 at the inside of the external magnetic pole parts at both sides and a female V-shaped taper joint face (c) at the central magnetic part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated iron core forming a sun-shaped closed magnetic circuit used for various electronic devices.

[0002]

2. Description of the Related Art A laminated iron core that forms a closed magnetic circuit in the shape of a sun is composed of:
Although widely used as cores for transformers and the like used in various consumer electronic devices, there is a strong demand for improved electrical characteristics such as low loss, low heat generation, high efficiency, and low leakage flux, as well as ease of assembly.

[0003] In order to satisfy these demands, various configurations have been devised. For example, FIG. 1A shows the most common EI iron core type. In this case, an E-type silicon steel sheet 1 and an I-type silicon steel sheet 2 are separately laminated and joined together by a so-called V caulking 3. In this case, a closed magnetic path is formed.

[0004] However, the EI iron core type is
Although it is easy to manufacture, it has a drawback that electrical characteristics such as no-load current, iron loss and leakage flux are not preferable as shown in the section of Comparative Example 1 in FIG.

On the other hand, recently, as shown in FIG. 1 (b), a silicon steel plate having both ends 4a and 4b in a triangular wedge shape is laminated, and a central magnetic leg integrally formed by V-caulking 3, and a taper inward. In addition to laminating a C-shaped silicon steel plate provided with a surface, outer magnetic legs 5a and 5b integrally formed by V-caulking 3 abut each tapered surface, and a central magnetic leg 4 is formed.
After setting the coil in the CIC type, the CIC type in which the tapered end portions 6, 6 are welded has been proposed. As shown in the section of Comparative Example 2 in FIG. Electrical characteristics superior to those of the iron core type are obtained.

However, there is a problem that welding of the tapered end portions 6 and 6 is required at the time of assembly, and a welding device or an instrument must be provided at the time of carrying out the assembly.

[0007]

Accordingly, the present invention can provide a device having more excellent electrical characteristics than the one shown in FIG. 1B, and is easy to assemble and has a welding process. It is an object of the present invention to provide a laminated iron core that constitutes a sun-shaped closed magnetic circuit that does not require a magnetic field.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and has a structure in which two types of E-shaped cores are abutted with each other, and outer magnetic legs on both sides are provided with a single tapered face. In this case, the central magnetic pole portion has a single tapered surface junction or a V-shaped tapered surface junction, and at least one portion as a whole has a male and female butting portion.

[0009]

Since the two E-shaped iron cores are joined by a single tapered surface or a single tapered surface and a V-shaped tapered surface, it is easy to manufacture a press die.
When the center pole is pushed in from both sides of the coil to join the two E-shaped iron cores, the male and female butt joints are tightly joined in the same manner as when a wedge is inserted, not only does not require welding, but also growls when energized. Does not occur. In addition, it is possible to obtain one having better no-load current and iron loss than that shown in FIG.

[0010]

FIG. 2 is a plan view of a part of a transformer using an iron core according to the present invention, and FIG. 3 is a plan view of an iron core according to the present invention. It is an E-type block in which E-type silicon steel sheets are laminated.

In these E-shaped blocks E1 and E2, the outer magnetic pole portions on both sides of one E-shaped block E1 are provided with tapered surfaces on the outside, and the outer magnetic pole portions on both sides of the other E-shaped block E2 are formed on the inside. Assuming that a tapered surface is provided, the tapered joining surfaces a1 and a2 are formed in an inverted C shape, and the central magnetic pole portions of both E-type blocks E1 and E2 are joined by a V-shaped tapered joining surface c. ing.

Reference numeral 7 denotes a 1,2 mm-thick metal cover in which a 0.5 mm thick cardboard 8 is wrapped around the outside of the iron core in a single layer, and fitted on the outside thereof. Reference numeral 9 denotes a coil.

The E-shaped core blocks E1 and E2 are continuously punched and laminated by an automatic press machine, and are automatically produced. And assembling, from both sides of the coil 9
When the central magnetic pole part is pressed and inserted, the tapered joint surface a1 + a2, the V-shaped joint surface c, the tapered joint surface a1 + c2, and the tapered joint surface a2 + c1, which are arranged in a reverse C-shape, are firmly formed in a wedge shape by the male and female fitting action at four locations. , And the joined portion comes into close contact with the coil 9 to such an extent that no humming occurs even when a current is applied to the coil 9 in this state.

In the case of nakedness, the no-load current and iron loss are as follows:
As shown in the section of Example 1 (FIG. 2) in FIG. 14, the no-load current and the iron loss obtained better electric characteristics than Comparative Example 2.

Leakage in the leakage flux is worse than that of Comparative Example 2 when naked, but this leakage flux is formed by winding a directional silicon steel sheet having a thickness of 0.35 mm one or two times outside the iron core. As a result, it can be easily reduced as shown in FIG. Also, as shown in FIG. 2, the thickness can be reduced by winding the thick paper 8 having a thickness of 0.5 mm and attaching the frame 7 thereto.

[0016] Therefore, in the manufacture, without the need for welding like the iron core of Comparative Example 2, it is possible to excel in electrical characteristics,
In addition, it is possible to provide a laminated iron core that constitutes a sun-shaped closed magnetic circuit that is easy to manufacture.

Next, different embodiments of the present invention will be described with reference to the drawings.

FIG. 4 shows another embodiment in which the adhesion after bonding is improved compared to the embodiment shown in FIG.
The E-type silicon steel plates forming the mold blocks E1 and E2 are integrated by V-crimping 3 (or may be cribbed or caulked), and the outer ends of the single tapered joints a1 and a2 provided on both outer magnetic pole portions. Provided with concave and convex engaging portions b1 and b2, which is particularly advantageous when a small iron core is manufactured.

The basic pattern of the embodiment shown in FIGS. 5 and 6 is the same as that of the embodiment shown in FIG. V
The size or the installation direction of the letter-shaped tapered joint c is changed.

The embodiment shown in FIG. 7 differs from the embodiment shown in FIG. 4 in the installation directions of the single tapered joint a2 of the outer magnetic pole portion on the right and the V-shaped tapered joint c of the central magnetic pole portion. In this case, in this case, the V-shaped joint surface c of the central magnetic pole portion and the tapered joint surface a1 + c1 arranged in an inverted C-shape tightly adhere to the joint surface by the male and female fitting effect,
An iron core having good electric characteristics can be obtained.

FIGS. 8 to 10 show an embodiment in which the central magnetic pole portion and the joining portion are each formed into a single taper junction.
In the case of the embodiment shown in FIG. 10, the male and female joints are formed by the single tapered joint surface a1 of the left outer magnetic pole portion, the single tapered joint surface c3 of the central magnetic pole portion, and the single tapered joint surfaces a1 and a2. It adheres tightly in a wedge-like manner and has good electrical properties.

The electrical characteristics of the embodiment shown in FIG. 8 are shown in the section of the embodiment 6 (FIG. 8) in FIG. The electrical characteristics were better than those of Example 1.

In the embodiment shown in FIG. 10, the direction in which the single tapered joint surface c3 provided in the central magnetic pole portion is provided is opposite to that shown in FIG.

FIG. 11 is a view in which the direction of the single tapered joint surface a2 on the right side of the embodiment of FIG. 10 is reversed. In this case, the three tapered joint surfaces a1, c3 and a2 have the same direction. Since the male and female mating effect cannot be obtained because there is no thing arranged in a reverse U-shape relationship, when the center pole portions of both E-shaped iron core blocks are inserted into the coil, it is easy to separate in the direction of the arrow,
Therefore, since the adhesiveness of the bonding surface is poor, as shown in the section of Comparative Example 3 (FIG. 4) in FIG. 14, good electrical characteristics as in the present invention cannot be obtained.

FIGS. 12 and 13 show an example of an iron core according to the present invention for a leakage transformer. FIG. 12 shows an example of the iron core having a pattern shown in FIG. An air gap H1 is provided, and the air gap H2 is provided in the central magnetic pole portion of the iron core having the pattern shown in FIG.

[0026]

According to the present invention, since the pattern of the E-shaped blocks E1 and E2 to be abutted is simple, it is easy to manufacture a punching die, and no welding is required. Not to be used, each E-shaped block can be automatically manufactured by an automatic press device, and it is easy to assemble, and the joints are tightly joined by the male and female fitting parts, and the electrical characteristics are excellent. Although there is an inferior point that the leakage flux is larger than that of Comparative Example 2 when bare, the effect is considerably better than that of Comparative Example 1 and the problem is solved by using a grain-oriented silicon steel sheet.
It can be easily solved by winding it twice or twice, or winding the cardboard once and fitting the outer frame. As a result, the overall electrical characteristics are better than the comparative example and welding-free production is possible. An easy iron core can be provided.

[Brief description of the drawings]

FIG. 1A is a plan view of a conventional EI type iron core, and FIG.
FIG. 2 is a plan view of a conventional CIC type iron core.

FIG. 2 is a plan view in which a part of a transformer using the iron core according to the present invention is cut away.

FIG. 3 is a plan view of an embodiment of the present invention.

FIG. 4 is a plan view of another embodiment of the present invention.

FIG. 5 is a plan view of another embodiment of the present invention.

FIG. 6 is a plan view of another embodiment of the present invention.

FIG. 7 is a plan view of another embodiment of the present invention.

FIG. 8 is a plan view of another embodiment of the present invention.

FIG. 9 is a plan view of another embodiment of the present invention.

FIG. 10 is a plan view of another embodiment of the present invention.

11 is a plan view of Comparative Example 3. FIG.

FIG. 12 is a plan view of another different embodiment of the present invention.

FIG. 13 is a plan view of another different embodiment of the present invention.

FIG. 14 is a diagram showing data and electrical characteristics of leakage fluxes of the product of the present invention and a comparative example.

[Explanation of symbols]

 E1, E2 E-shaped block a1, a2 Tapered joint surface c V-shaped tapered joint surface 3 V caulking 7 Metal cover 8 Cardboard 9 Coil

Claims (1)

[Claims] 1. A method in which two types of E-shaped iron cores are abutted with each other, outer magnetic legs on both sides have a single tapered surface joint, and a central magnetic leg has a single tapered surface joint or a V-shaped tapered surface joint. A laminated iron core forming a closed-L-shaped magnetic path characterized in that at least one portion as a whole has a male and female butting portion.