JPH01134905A - Laminated core - Google Patents

Abstract

PURPOSE:To make it possible to fully automate the manufacturing process of the title laminated core and to contrive reduction in the cost of manufacture by a method wherein each of magnetic plates is fixed by providing a connection groove, formed by the plastic deformation crossing each lamination line, on the external circumferential surface of the laminated core. CONSTITUTION:A laminated core 1 is formed by alternately stacking a plurality of silicon steel plates 2 and 3 of E-type and I-type, for example. At that time, a junction groove 6 crossing laminated laver lines 4L... is provided by plastic deformation on the external surface 4 of the core 1, and the steel plates 2 and 3 are fixed. The connection groove 5 is formed by forcibly crushing the external circumferential surface 4 using a punch and the like. As a result, the process of manufacture can be fully automated, and the reduction in cost of production can be achieved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a laminated core used for transformers, choke coils, etc.

[Conventional technology]

Generally, silicon steel plate (magnetic plate) formed into E shape and ■ shape
Laminated cores in the form of outer iron are known, in which the cores are abutted and alternately reversed and stacked, and in recent years, the manufacturing process of transformers and the like using such laminated cores has become increasingly automated.

By the way, this type of automatic manufacturing equipment uses an E-type coil bobbin! The assembly is performed by automatically inserting shaped silicon steel plates one by one from the left and right side by side, and it cannot be inserted unless there is a certain amount of insertion space.

For this reason, the last few silicon steel plates had to be inserted manually into the narrow gap. In addition, since the ■-shaped silicon steel plate would fall off if left in this state, adhesive tape was manually wrapped around the outer circumferential surface of the laminated core to temporarily fix it. A varnish was applied to fix it.

[Problem that the invention seeks to solve]

However, although the conventional laminated core can automate the manufacturing process to a certain extent, it has the following problems.

First, the process of assembling silicon steel sheets, taping, etc. involves manual labor, so it is not possible to fully automate the process.
This causes a problem that increases the number of manufacturing steps.

Second, it requires taping, which increases material costs.

In addition, when taping, the positions of the silicon steel plates are usually aligned by placing the outer peripheral surface of the laminated core on a desk, etc. At this time, the E-shaped and ■-shaped silicon steel plates that make up the laminated core are manufactured in each production lot. As a result, the abutting surfaces of the E-shaped and ■-shaped silicon steel plates do not come into perfect contact with each other, resulting in variations in quality and deterioration of magnetic properties.

Third, tapes are generally sensitive to heat and external shocks, resulting in insufficient fixing ability.

[Means for solving interlayer points]

The present invention aims to provide a laminated core that solves the problems existing in the above-mentioned conventional technology, and is achieved by the laminated core I shown below.

That is, the laminated core l according to the present invention includes a plurality of silicon steel plates (magnetic plates) 2... and 3... made of E-shape and I-shape, for example.
・In a laminated core of the type in which .
and 3... are characterized by being fixed to each other.

[For production]

Next, the operation of the present invention will be explained.

In the present invention, the outer circumferential surface 4 of the laminated core that has been automatically assembled is
For example, since the joint grooves 5 are formed by forcibly crushing with a linear punch or the like, the plastically deformed portions caused by the joint grooves 5 press and fix the silicon steel plates 2 and 3 to each other.

〔Example〕

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view of a transformer using a laminated core according to the present invention, FIG. 2 is an exploded perspective view of the laminated core, FIG. 3 is a plan view of a joining groove provided in the laminated core, and FIG.
This figure is a sectional view of the same joining groove, and FIG. 5 is a perspective view of a laminated core according to another embodiment of the present invention.

First, in order to clarify the present invention, a schematic configuration of a transformer T using a laminated core I will be described.

The laminated core l has an outer iron shape, and a coil bobbin 11 is attached to the central core portion, and a coil 12 is wound around the coil bobbin 11. In addition, 13 is a bobbin cover, 1
4 is a connection terminal provided integrally with the coil bobbin 11, and connects the end of the coil 12.

On the other hand, the laminated core 1 is constructed according to the present invention, and, as shown in FIG. 2, is composed of a combination of E-shaped silicon steel plates 2 and I-shaped silicon steel plates 3. The silicon steel plate is assembled from one side of the coil bobbin 11 to the E-shaped silicon steel plate 2.
is inserted, and the I-shaped silicon steel plate 3 is butted from the other side. In this automatic assembly, the E-shaped and ■-shaped silicon steel plates 2 and 3 are alternately reversed and stacked one after another from both side openings of the coil bobbin 11.

When the number of sheets that can be automatically inserted is completed, or when the final assembling of the silicon steel plates by hand is completed if necessary, a joining groove 5 is formed on the outer circumferential surface 4 by plastic deformation across each lamination line 4L... . The joining groove 5 is set to intersect the lamination line 4L in a non-perpendicular state, that is, to intersect it obliquely.

The joining groove 5 can be formed by applying an impact to the laminated core from both sides in the vertical direction using, for example, a linear punch with a sharp tip, so that the upper and lower outer peripheral surfaces 4 are crushed, and the impact area is The concave joining groove 5 due to plastic deformation can be easily and simultaneously provided.

Each lamination line 4L...
is bent in an S-shape as shown in FIG. 3, and furthermore, due to the bulge caused by plastic deformation, the adjacent silicon steel plates 2 and 3 are brought into pressure contact (engaged) and fixed in phase.

In addition, when an impact is applied to the outer peripheral surface 4, each silicon steel plate 2
... and 3... are forcibly pressed, and the abutting surfaces of the E-shaped and I-shaped silicon steel plates come into close contact, eliminating any gaps.

Although the joining groove 5 is provided diagonally, it may be provided perpendicularly to the lamination line 4L like the joining groove 6 shown in FIG. Two joining grooves 7a and 7b may be provided in each. Furthermore, a plurality of joining grooves 5 and 6 may be provided on one side.

Although the embodiments have been described in detail above, the present invention is not limited to these embodiments.

For example, the cross-sectional shape of the joining grooves 5 is arbitrary, and the longitudinal shape of the joining grooves 5 is not limited to a straight line, but may be curved or bent as necessary. Furthermore, the laminated core can be applied to the laminated core of any electromagnetic equipment such as the illustrated transformer, Chittark coil, and motor. Other changes may be made in the detailed configuration, shape, number of devices, materials, etc., without departing from the gist of the present invention.

〔Effect of the invention〕

As described above, since the laminated core according to the present invention is formed by providing bonding grooves by plastic deformation across the lamination lines on the outer peripheral surface and fixing the magnetic plates to each other, the following significant effects are obtained.

■ It becomes possible to fully automate the manufacturing process, significantly reducing manufacturing man-hours and, by extension, manufacturing costs.

■ Temporary fixing tape is no longer required, contributing to lower material costs.

■ It is resistant to heat and external damage, and can reliably prevent, for example, I-shaped magnetic plates from falling out after assembly.

■ The abutting surfaces of the laminated core can be brought into close contact with each other, contributing to uniform quality and improved magnetic properties.

[Brief explanation of the drawing]

Figure 1: A perspective view of a transformer using a laminated core according to the present invention, Figure 2: An exploded perspective view of the same laminated core, Figure 3: A plan view of a joining groove provided in the same laminated core, Figure 4:
FIG. 5 is a cross-sectional view of the joining groove; and FIG. 5 is a perspective view of a laminated core according to another embodiment of the present invention. In the drawings, l: laminated core 2..., 3...; silicon steel plate (WL magnetic plate 4: outer peripheral surface 4L...: laminated line 5.6, 7a, 7
b: Joint groove patent applicant Patent attorney representing Nagano Japan Radio Co., Ltd. 1) Shigeru Figure 1 Φ Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] A laminated core configured by stacking a plurality of magnetic plates, characterized in that the magnetic plates are fixed to each other by providing a joining groove by plastic deformation across each lamination line on the outer peripheral surface.