JPS5857895B2 - Winding core manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a wound core, and provides a method for manufacturing a wound core using an amorphous sheet.

As is well known, wound cores are used in small transformers such as columnar transformers.

Incidentally, there has been remarkable progress in low-loss technology for iron core materials, and in particular, amorphous metals have begun to attract attention as new low-loss magnetic materials, and small transformers using them are already being prototyped in the United States.

Amorphous is formed into a sheet by dropping melt, ie, molten alloy, into a thread from a nozzle and rapidly cooling it on a rotating cold roller.

Note that the cooling rate at this time is several hundred degrees per tenth of a second.

By the way, when a normally molten alloy solidifies into a solid metal, it always has a regular atomic arrangement, that is, crystallinity.

However, when amorphous metal solidifies into a solid metal, it is rapidly cooled to below a certain critical temperature called the glass temperature, so the arrangement of atoms can transition to an amorphous state, that is, a glass-like state.

However, it has a shiny metallic appearance and is not transparent like ordinary glass.

This amorphous steel has the following characteristics compared to ordinary silicon steel.

A Hysteresis loss is small at 1/3 to 1/4.

B The maximum magnetic permeability is 3 times or more larger.

C: Excellent corrosion resistance.

D: High mechanical strength (tensile strength).

Because it has such excellent characteristics, a high-performance iron core can be obtained by using amorphous.

By the way, since amorphous material is manufactured using a special manufacturing method as described above, it is not possible to manufacture amorphous materials as thick as silicon steel strips conventionally used for iron cores.

As a result, although amorphous has a high tensile strength, its overall strength is low due to its thin thickness.

Therefore, this point must be taken into consideration when manufacturing an amorphous core.

Here, amorphous sheet-shaped amorphous
Let us specifically compare the strength of the sheet and the silicon steel strip.

The tensile strength of an ordinary amorphous sheet is approximately 70 kg.
/mri or more, silicon steel strip has more than 40 kg/mri, and amorphous sheet has about twice the tensile strength.

Also, the thickness of the amorphous sheet is 0.03ii and the thickness of the silicon steel strip is 0.3 mm.

Therefore, when comparing the strength of the two by considering the width (with respect to the unit length) and the thickness, the amorphous sheet has a strength of 70 (kgAfL4) Xo, 03 (mm) -2
,1 (kg) silicon steel strip is 40 (ky/J) X O,3 (mm) -12,0
(kg).

That is, since the thickness is different by one order of magnitude when comparing the same width, it can be seen that the amorphous sheet has only about 1/6 the strength of the silicon steel strip.

Also, amorphous sheets become brittle when annealed.

For this reason, even if an attempt is made to manipulate the winding core by winding the amorphous sheet around a former while applying tension as in the prior art, the amorphous sheet will easily break during winding.

SUMMARY OF THE INVENTION In view of the above-mentioned prior art, an object of the present invention is to provide a method for manufacturing a wound core that can wind an amorphous sheet without applying tension to the amorphous sheet.

The present invention achieves this object by fixing the leading ends of a plurality of silicon steel strips wound around a drum to a winding form, and further fixing the leading ends of a plurality of amorphous sheets wound around another drum to the former. The amorphous sheet is inserted between the tips of the silicon steel strips, and in this state, while applying tension to the silicon steel strip, the winding form is rotated to sandwich the amorphous sheet between the silicon steel strips and the amorphous sheet is inserted into the winding form together with the silicon steel strip. It is characterized by being wound around.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 shows an apparatus for implementing an embodiment of the invention.

As shown in the figure, a silicon steel band 2 is wrapped around two rotatable drums 1, and a plurality of rotatable drums (a barracks in the figure) are arranged between these two drums 1. An amorphous sheet 4 is wound around the drum 3.

The back tension device 5 sandwiches the middle of the silicon steel strip 2,
Back tension is applied when the silicon steel strip 2 is wound.

An embodiment of the present invention in which a wound core is manufactured using the above-mentioned apparatus is as follows:
First, the tips of the two silicon steel strips 2 are fixed to the winding form 6.

Next, the tips of the plurality of amorphous sheets 4 are inserted between the tips of the silicon steel strips 2, and the winding form 6 is slightly rotated to sandwich the tips of the amorphous sheets 4 between the silicon steel strips 2.

Here, the back tension device etc. are operated to tighten the silicon steel strip 2.
When the winding form 6 is rotated while applying tension to the amorphous sheet 4, the amorphous sheet 4 is wound around the winding form 6 while being sandwiched between the silicon steel strips 2, and a wound core 7 of a predetermined thickness is obtained.

The wound core 7 obtained in this example is shown in FIG.

The structure of this wound core 1 is that, as shown in FIG. 3, which is an enlarged view of the part shown by the arrow (■) in FIG. A silicon steel strip 2 is wound around it.

As described above in detail with the embodiments, according to the present invention, an amorphous sheet is wound around a winding form while being sandwiched between tensioned silicon steel strips, so that excessive tension is not applied to the amorphous sheet itself. This prevents breakage during winding.

Furthermore, the amorphous sheet is tightly wound with silicon steel strips, and the outermost and innermost peripheries of the wound core are made of silicon steel bands, so even if strain is applied to the wound core, the amorphous sheet will remain intact. It can protect fragility.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an apparatus for realizing an embodiment of the present invention;
FIG. 2 is a front view showing the wound core manufactured according to this example, and FIG. 3 is an enlarged view showing the part shown by the arrow (■) in FIG. In the drawings, 1 and 3 are drums, 2 is a silicon steel strip, 4 is an amorphous sheet, and 6 is a winding form.

Claims (1)

[Claims] 1. Fixing the tips of a plurality of silicon steel strips wound around a drum to a winding form, further inserting the tips of a plurality of amorphous sheets wound around another drum between the tips of the silicon steel bands, The wound iron core is characterized in that in this state, the amorphous sheet is sandwiched between the silicon steel strips by rotating the former while applying tension to the silicon steel strip, and is wound together with the silicon steel strip around the former. Production method.