JPH0221647B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a wound core using an amorphous electromagnetic thin plate, and particularly to a manufacturing method that does not cause deformation of the wound core even if a core metal is removed.

Amorphous magnetic materials are attracting attention due to their excellent magnetic properties, and various studies are being conducted on their application to power transformers. However, since it is used as a very thin plate material of about 30 μm, problems will arise if a wound core is made using the same method as when using a silicon steel plate.

That is, to explain the conventional general manufacturing process with reference to FIGS. 1 and 2, as shown in FIG. is wound a prescribed number of times to form a wound core 2. The enlarged perspective view of FIG. 2 clearly shows this state. As shown in FIG.
A plurality of turns of electric wire are wound around the wound iron core 2 with the wire still attached to form an excitation coil 3, and both ends thereof are connected to a power source 4 and annealed while being excited. (Note that this method is referred to as magnetic field annealing.) After performing this magnetic field annealing, the core metal 1 and exciting coil 3 are removed as shown in FIG. 1C to obtain a wound core.

Therefore, after this, the winding is directly wound around this wound core, or the leg is cut approximately at the center in the horizontal direction and the winding is inserted and engaged, and the wire is reattached to form the contents of the transformer. Ta.

The reason why the core metal 1 is used until magnetic field annealing in the above case is that, as mentioned earlier, the amorphous electromagnetic thin plate is extremely thin, about 1/10th the thickness of the silicon steel plate. In addition, if it is removed before magnetic field annealing, the wound core will be deformed.

By the way, if we consider this from the perspective of factory production,
For example, in a factory that produces 5,000 pole transformers per month, it is necessary to prepare at least about 700 to 800 core metals, but these core metals are made of stainless steel, although they are expensive because they are annealed in a magnetic field. It is necessary to do so, which increases the cost and has a drawback in terms of productivity.

The present invention has been made to solve these difficulties, and will be explained with reference to FIGS. 3 to 5. As shown in FIG. Attach a bobbin 10 manufactured by The condition is as shown in the detailed view in FIG. 4, and the bobbin 10 has grooves 11 provided on the surface side of the portions that will become the legs of the wound core. Further, the bobbin 10 used has sufficient strength (thickness) to prevent deformation of the wound core 2 by itself. Next, as shown in FIG. 3B, an amorphous electromagnetic thin plate is wound around the surface of the bobbin 10 a predetermined number of times to form a wound core 2.
Next, as shown in FIG. 3C, the core metal 1 is removed, the excitation coil 3 is wound, and both ends of the excitation coil 3 are connected to a power source 4 and annealed while being excited. (Magnetic field annealing) After performing this magnetic field annealing, the exciting coil 3 is removed as shown in FIG. Next, as shown in E of the same figure, the legs of the wound core 2 are wrapped tightly with a thermosetting resin tape 12, and after the resin tape 12 is thermosetted, the bobbin 10 is removed and thermosetted as shown in F of the same figure. Resin tape 1
It is possible to obtain a wound iron core 2 which is bound tightly and becomes difficult to deform.

A detailed view of the state in which the thermosetting resin tape 12 is tightly wound is shown in FIG.
The grooves 11 (see FIG. 4) provided on the surface of the resin tape 12 are effectively utilized, and it is easy to restrain and wind the wound core 2 with the resin tape 12. After that, using the same method as before, either wind the winding directly around the core, or cut the leg horizontally at the center, fit the winding into engagement, and then connect the cut points to remove the band from the outside. It can be tightened to form a cut core and the inside of a transformer.

As described above, in the present invention, by preparing a bobbin, it is possible to reduce the number of core metals to be prepared, and the bobbin is made of an amorphous electromagnetic thin plate that can be easily deformed into a thin layer using the grooves on the surface of the bobbin. A wound core with a stable structure can be obtained by a relatively simple method such as being able to wrap a thermosetting resin tape so as not to deform the wound core.

[Brief explanation of drawings]

Figure 1 is a front view explaining the conventional wound core manufacturing process, Figure 2 is an enlarged perspective view corresponding to Figure 1A,
3 is a front view illustrating the manufacturing process of the wound core of the present invention, FIG. 4 is an enlarged perspective view of the state shown in FIG. 3A, and FIG. 5 is an enlarged perspective view of the state shown in FIG. 3E. DESCRIPTION OF SYMBOLS 1...Core metal, 2...Wound iron core, 3...Excitation coil, 4...Power source, 10...Bobbin, 12...Thermosetting resin tape.

Claims (1)

[Claims] 1. A bobbin made of a non-magnetic material having grooves in the width direction on the surface is attached to the outer periphery of the cored metal, and after winding an amorphous electromagnetic thin plate around the outer periphery of this bobbin, the cored metal is removed,
After winding an excitation coil around this and performing magnetic field annealing, the excitation coil is removed, and the amorphous electromagnetic thin plate wound using the grooves in the width direction on the surface of the bobbin is wrapped with thermosetting resin tape. A method for manufacturing a wound iron core, characterized in that the resin tape is thermally cured by heating after being tightly wound, and then the bobbin is removed.