JPS637009B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a low-loss wound core using an amorphous magnetic ribbon.

Among the amorphous metal magnetic materials developed in recent years, some have excellent magnetic properties as iron core materials, and in particular, their core loss value is much lower than that of conventional grain-oriented silicon steel strips. Research is underway to use the material in the wound cores of power transformers and instrument transformers. However, due to the manufacturing process, it is difficult to make this amorphous metal magnetic material as thick as grain-oriented silicon steel strips, and even if it is made as thick as possible, it is thought that the limit is about 100 μm. Currently, the diameter is 40 to 60 μm.
Only a few thin strips have been made. If a wound core is made of such an extremely thin amorphous magnetic ribbon with a surface insulating film applied in the same way as conventional grain-oriented silicon steel strips, the space factor of the core will be poor and the equipment will be too large. The problem arises that In addition, when the wound core is constructed using an amorphous magnetic ribbon without a surface insulation film, eddy currents flowing between the layers of the wound core increase.
The original low core loss feature of the amorphous magnetic ribbon is lost.

The present invention has been made in view of the above points, and is intended to obtain a wound core with a good space factor and a small interlayer eddy current loss by using an amorphous magnetic ribbon with high magnetic permeability and low iron loss. , an amorphous magnetic ribbon with an insulating layer formed on the surface of an amorphous magnetic ribbon without a surface insulating film is electrically insulated, and a multi-layer amorphous magnetic ribbon without a surface insulating film is created. By overlapping and continuously winding a thin ribbon and at least one layer of amorphous magnetic thin ribbon on which a surface insulating film is formed, it is possible to create an electrical conductor with magnetic permeability that is easy to work with and has excellent safety. The object of the present invention is to provide a wound core having an insulating layer inside.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of a wound core according to the present invention, and as shown in FIG. For each of the multiple layers (two layers in the illustrated example) of the amorphous magnetic ribbon 2, one or more layers are coated with a surface insulating film (indicated by 4 in FIG. 2) made of glass or phosphate as an insulating layer. A plurality of layers of amorphous magnetic thin strips 3 are interposed, and the amorphous magnetic thin strip 2 having no surface insulating film is divided into blocks by the amorphous magnetic thin strip 3 having a surface insulating film. , each block is electrically insulated.

As shown in FIG. 3, such a wound core 1 consists of an amorphous magnetic ribbon 2 without a surface insulation film set in unwinders 5 and 6, and a surface insulation film set in an unwinder 7. After the amorphous magnetic ribbon 3 having the coating 4 is layered and wound on a winding jig 8 to form a bare iron core 9, processing (for example, interlayer fixation and cutting with resin) for attaching a winding wire (not shown) is performed. It is made with sutra. Although FIG. 1 shows an example of a cut core having a seam 10, a wrap joint core or an uncut core can also be manufactured in the same manner.

The surface insulating film 4 shown in FIG. 2 can be applied to both or one side of the amorphous magnetic ribbon 2, similar to the conventional grain-oriented silicon steel strip. In order to improve the space factor, it is advantageous to apply the surface insulating coating 4 only to one side.

When a magnetic flux passes through the wound core 1 configured as described above, the amorphous magnetic ribbon 3 with a surface insulation coating is applied.
Due to the presence of the above-described surface insulating film, no eddy current flows between the blocks of the amorphous magnetic ribbon 2 without the surface insulating film, so the interlayer eddy current loss of the wound core is lower than in the case without such an insulating layer. is significantly reduced. As mentioned above, the thickness of the amorphous magnetic ribbon is extremely thin compared to the grain-oriented silicon steel strip, so a surface insulating coating is applied to each of the multiple layers of the amorphous magnetic ribbon 2, which does not have a surface insulating coating. Even if the amorphous magnetic ribbon 3 is interposed, the specific resistance against eddy current in each block of the amorphous magnetic ribbon 2 can be made sufficiently large, and the loss reduction effect can be achieved without significantly impairing the space factor. It can be given.

As described above, the winding work of the wound core can be carried out efficiently, and in particular, in the winding work, an amorphous magnetic ribbon and an amorphous magnetic ribbon with a surface insulation coating can be wrapped in the same manner. It becomes possible to wind up with the winding tension, tension management becomes extremely easy, and since continuous work is assumed, workability and work safety are improved. Furthermore, the features of the amorphous magnetic ribbon with high magnetic permeability and low iron loss are utilized, and compared to simply using kraft paper or polyester sheets with an insulating layer interposed between each layer, the space It is possible to reduce interlayer eddy current without significantly impairing the magnetic flux, and it is possible to provide a wound core that is small and has excellent characteristics while obtaining the same magnetic flux within the core. Furthermore, since the insulating layer and the non-insulating layer are made of the same amorphous magnetic ribbon material and have the same hardness, the insulating layer is effectively prevented from deteriorating the insulation without causing damage to the insulating layer due to edges, which was seen in the prior art. Secondary effects were also obtained.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the wound core according to the present invention, in which a is an overall view, b is an enlarged view of part A, and FIG.
The figure is an enlarged cross-sectional view of an amorphous magnetic ribbon having a surface insulating film shown in FIG. 1, and FIG. 3 is an explanatory diagram of the manufacturing process of the wound core shown in FIG. 1. 1, 1: Wound iron core, 2: Amorphous magnetic ribbon without surface insulation film, 3: Amorphous magnetic ribbon with surface insulation film, 4: Surface insulation film (insulating layer),
4': Insulating sheet (insulating layer).

Claims (1)

[Claims] 1. In a wound core constructed using amorphous magnetic ribbons with high magnetic permeability and low core loss, a plurality of layers of amorphous magnetic ribbons without a surface insulation coating and at least one layer with a surface insulation coating are formed. 1. A wound core characterized in that it is provided with an electrically insulating layer having magnetic permeability, which is composed of a laminated continuous winding layer including one layer of amorphous magnetic ribbon.