JPS59181007A - Iron core - Google Patents

Abstract

PURPOSE:To obtain the excellent magnetic characteristics of the amorphous magnetic alloy thin belt by sticking the amorphous magnetic alloy thin belt with an adhesive which does not cause deteriortion of the magnetostriction so as to prevent variation of the magnetic characteristics caused by cure shrinkage of the adhesive. CONSTITUTION:An amorphous magnetic alloy thin film belt 1 forming the iron core by being laminated or wound is stuck by using an adhesive which does not cause deterioration of the magnetostriction such as a silicon-group resin varnish. Since the silicon-group resin shrinks on curing in a relatively soft state having an elasticity, the shrinking force at cure shrinkage is not almost influenced by the silicon-group resin for adherence. Accordingly, improvement of the magnetic characteristics can be contrived.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to an iron core using an amorphous magnetic alloy ribbon.

[Technical background of the invention and its problems]

BACKGROUND ART Recently, amorphous magnetic alloy ribbons have been used as core materials for laminated cores or wound cores provided in inductors such as transformers. Amorphous magnetic alloy ribbon is produced by cooling a molten magnetic alloy consisting of metals (iron, cobalt, etc.) and metalloid elements (boron, phosphorus, silicon, etc.) using an ultra-quenching method. When manufacturing a core material or wound core using materials with excellent soft magnetic properties, the core is impregnated with a binder, i.e., a resin, and fixed in order to unite the core formed by laminating or winding thin strips. There is a way. In this method, the iron core is immersed in molten resin to allow the resin to infiltrate between each ribbon layer in the core, and then the resin is hardened to fix each ribbon layer to each other.

Traditionally, epoxy-based resins have been used to impregnate iron cores.

Polyester resins, butadiene resins, etc. are used, but these types of resins have the property of becoming extremely hard due to curing shrinkage.

For this reason, when these resins harden and shrink, the amorphous magnetic alloy ribbon is directly subjected to the contraction force of the resin, and the magnetostriction of the ribbon deteriorates due to the contraction force of the resin, causing the magnetic properties to deteriorate. A phenomenon occurs in which the value fluctuates. This tendency is particularly observed in materials with large magnetostriction, that is, iron-based amorphous magnetic alloys.

In other words, the magnetic properties of iron-based amorphous magnetic alloy ribbons vary greatly due to the curing and shrinkage force of the resin. Then, it becomes impossible to obtain the desired magnetic properties as an iron core.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned circumstances, and is made by using an amorphous magnetic alloy ribbon and fixing the ribbon with a fixing agent. The present invention provides an iron core having excellent magnetic properties instead of an amorphous magnetic alloy ribbon.

[Summary of the invention]

The iron core of the present invention is made by laminating or winding amorphous magnetic alloy ribbons to form the core and fixing them using a fixing agent that does not deteriorate magnetostriction, such as a silicone resin varnish. That is, the silicone resin cures in a soft state with elasticity, and absorbs a large amount of curing shrinkage, particularly shrinkage force, thereby significantly reducing the effect of the shrinkage force on the ribbon. The iron core of the present invention is particularly effective for those using iron-based amorphous magnetic alloy ribbons with large magnetostriction.

[Embodiments of the invention]

Examples of the present invention will be described below.

The iron core of the present invention is a laminated iron core formed by laminating amorphous magnetic alloy ribbons 1 as shown in FIG. 1, or a laminated iron core formed by winding amorphous magnetic alloy ribbons 1 as shown in FIG. It is a wound core. The amorphous magnetic alloy ribbon 1 is iron-based, that is, contains iron and a metalloid element (phosphorus).

The iron core is impregnated with silicone resin varnish as a fixing agent that does not deteriorate the magnetostriction of the amorphous magnetic alloy ribbon 1. The amorphous magnetic alloy VJ, which is laminated or wound by hardening, is fixed between each layer of the band 1. That is, the silicone-based resin cures and contracts in a relatively soft state with elasticity, and when it cures and contracts, most of the shrinkage force is absorbed internally. For this reason, when the silicone resin hardens and shrinks, the proportion of shrinkage force acting on the amorphous magnetic alloy ribbon 1 that forms the iron core is very high. Therefore, even if the amorphous magnetic alloy ribbon 1 is made of an iron-based amorphous magnetic alloy with a large magnetostriction, there is almost no deterioration of the magnetostriction due to the effect of the hardening contraction force of the silicone resin, and the magnetic There is a lot of fluctuation. Therefore, this iron core made using the iron-based amorphous magnetic alloy ribbon 1 can obtain the desired magnetic properties with almost no influence from the silicon-based resin used for fixing.

Next, a method for manufacturing this iron core will be explained. Amorphous magnetic alloy ribbons 1 are laminated or wound to form an iron core, and this iron core is impregnated with resin using an ultrasonic impregnation device shown in FIG. That is, an iron core is placed in a silicone resin solution 3 placed in a container 2, and a vibrator 4 is driven by an ultrasonic generator to cause the resin solution 3 to vibrate ultrasonically. The resin solution 3 is impregnated into the glabella of the amorphous magnetic alloy ribbon 1 forming the iron core while being ultrasonically vibrated. Since the amorphous magnetic alloy ribbon 1 is thin, it can be well impregnated with resin. The silicone resin solution 3 contains a diluent to lower the resin viscosity, but unlike conventional vacuum impregnation, the diluent does not evaporate in ultrasonic impregnation, making it easier to control the viscosity of the resin solution. I can do it.

Next, the resin impregnated into the iron core is heat-cured or naturally cured.

However, when manufacturing a split-type wound core as shown in Fig. 2, the amorphous magnetic alloy ribbon 1 is wound to form a circular core, and the circular core is cut at the center and paired. It is divided into C-shaped cores, and the joint end surface (cut surface) of the C-shaped core is further divided into C-shaped cores.
Polish the caroe. Here, the advantage of cutting the circular core using a wire saw is that the cut surface of the core can be polished at the same time as the cutting. In other words, wire saw processing is the fourth
As shown in the figure, while reciprocating the wire saw 5, abrasives and cutting oil are added to the iron core, that is, the amorphous magnetic alloy ribbon 1.
The wire saw cuts the iron core so that the ribbons 1 are uniformly aligned and finished with high precision. In other words, a cut surface equivalent to that obtained by polishing can be obtained. Further, when cutting with the wire wire 5, the stress applied to the amorphous magnetic alloy ribbon 1 is small, and the surface temperature of the cut surface is low, so that the ribbon 1 does not crystallize. In addition,
The cutting direction is preferably perpendicular to the lamination direction of the ribbon 1.

[Summary of the invention]

As explained above, the iron core of the present invention is free from fluctuations in the magnetic properties of the amorphous magnetic alloy ribbon due to impregnation with a fixing agent, and can obtain excellent magnetic properties of the amorphous magnetic alloy ribbon. Effective for iron cores made of iron-based amorphous magnetic alloy ribbons with large magnetostriction.

[Brief explanation of drawings]

1 and 2 are perspective views showing a laminated core and a wound core, respectively, which are the objects of the present invention, FIG. 3 is an explanatory diagram showing an ultrasonic impregnation device, and FIGS. 4(a) and (b), respectively. It is an enlarged explanatory view showing wire saw processing. 1...Amorphous magnetic alloy ribbon

Claims (3)

[Claims] (1) An iron core made by fixing amorphous magnetic alloy ribbons with a fixing agent that does not deteriorate magnetostriction. (2) The iron core according to claim 1, wherein the amorphous magnetic alloy ribbon is iron-based. (3) The fixing agent is silicone resin. Claim 1
Iron core as described in Section.