JPS58215011A - Manufacture of rolled core - Google Patents

Abstract

PURPOSE:To eliminate the need for the removal of a bobbin from a rolled core and reduce the quantity of excess heat for energy conservation, by a method wherein an extremely thin amorphous steel strip is wound on a hollow bobbin of a magnetic material into an integral body and then subjected to a magnetic field annealing. CONSTITUTION:A soft magnetic steel strip is bent, and seamed parts thereof are welded to each other to form a hollow thin bobbin barrel 6. Similar soft steel flanges 7 are welded to both ends of the bobbin barrel 6 to produce a hollow bobbin 8. A winding core 9 is inserted into the bobbin 8, and the driving shaft of a winder is attached to one end of the core 9. With the bobbin 8 rotated, a thin amorphous magnetic steel strip 2 is wound on the barrel 6. In this case, the winding starting and terminating ends of the steel strip 2 are fixed with an adhesive tape. Thereafter, the core 9 is removed, and a glass tape-coated steel wire is wound on a wound core 10 with the bobbin 8, to provide an exciting winding 11. This is placed in an annealing furnace under a non-oxidative atmosphere, and the winding 11 is energized to anneal the steel strip 2. Then, the bobbin 8 is taken out of the furnace, and the winding 11 is removed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method for manufacturing a wound core using a pole (thin magnetic steel strip).

[Technical background of the invention]

As is well known, 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 prototype wound cores using this material have already been made. There is.

Next, with reference to FIG. 1, a conventional method for fabricating a wound core using this amorphous material will be explained. A wound core 3 is manufactured by winding a predetermined number of amorphous thin plates 2 on an integral or split iron core 1.

Next, the excitation winding 4 is inserted into the center penetrating length 5 of the winding core 1 and wound around the winding core 3. Subsequently, the above-mentioned excitation winding 4 is energized in an annealing furnace with a non-oxidizing atmospheric gas such as nitrogen or hydrogen, annealed in a magnetic field, and then cooled, and the wound core 3 attached to the winding core 1 is taken out from the furnace. Then, the excitation winding 4 and the winding core 1 are removed, and the winding core 3 is sent to the next process.

[Problems with background technology]

Since the wound core 3 manufactured in this manner is annealed while being wound around the iron core 1, the heat capacity of the core 1 is large and there are the following problems.

1 Extra heat is required during annealing.

2. Desired magnetic properties cannot be obtained because the cooling rate is too high.

3. The winding workability of the excitation winding for magnetic field and annealing is poor.

Furthermore, it is currently possible to produce amorphous sheets with extremely thin plate thicknesses of I to I μm. However, since the plate thickness is too thin, it is weak, so it is difficult to remove the amorphous thin plate from the winding core 1, and the shape of the winding core is distorted.

[Purpose of the invention]

The invention has improved the above-mentioned drawbacks, eliminating the need to remove the winding frame from the winding iron core, reducing excess heat and saving energy, increasing the cooling rate in magnetic field annealing, and increasing the spacing of the winding for one excitation. An object of the present invention is to provide a method for manufacturing a wound core that facilitates winding.

[Summary of the invention]

The present invention is characterized in that an amorphous steel strip (hereinafter referred to as amorphous magnetic steel strip) is wound and integrated around a hollow winding frame made of a magnetic material, and annealed in a magnetic field. As a result, it is no longer necessary to remove the winding frame from the winding core, which prevents the winding core from deforming, reduces excess heat, saves energy, increases the cooling rate in magnetic field annealing, and allows the excitation winding to be wound. Make it easier.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is a perspective view of an example J of the present invention, in which a hollow, thin-walled winding frame side 6 is manufactured by bending a mild steel magnetic strip and fixing the joint by welding. A hollow C winding frame 8 is manufactured by welding a mild steel layer francita to this. This winding frame 8 has a winding core 9
is inserted, and the winding core 9 is attached to the drive shaft of a winder (not shown). The beginning of winding the amorphous magnetic steel strip 2 is fixed to the winding frame side 6 with adhesive tape, etc., and the drive shaft is rotated to wind it to a predetermined thickness.
Although the end of the winding is not shown, it is fixed with an adhesive tape or the like, and the winding core 9 is removed to form a winding core 10 with a winding frame 8 attached. Next, the copper wire is wrapped with a glass tape or the like to make it heat resistant to form the excitation winding 11, which is inserted into the hollow of the winding frame 8 and wound around the wound core 10 all around the wound core 10. A predetermined number of turns are made. Next, the wire is placed in an annealing furnace with a non-oxidizing atmosphere gas such as hydrogen, the excitation winding 11 is energized, annealed in a magnetic field, cooled, and the wound core 10 with the winding frame 8 is taken out from the annealing furnace. . Then, the excitation winding 11 is removed and the wound core 1o is sent to the process with the winding frame 8 attached.

With this configuration, since the winding frame 8 is hollow, the winding workability of the excitation winding 11 is improved. Next, since the wall thickness of the winding frame side 6 is thin, the heat capacity of the winding frame side 6 is small, and the temperature rise and cooling rate in magnetic field annealing are fast (this results in energy savings. In particular, the faster cooling rate is due to the amorphous 4 for improving the magnetic properties of the high-quality magnetic steel strip 2 is also one of the important processing steps, and as a result of the non-invention, the magnetic properties of the wound core 10 wound with the non-quality magnetic steel strip 2 are significantly improved. Furthermore, since the wound core 10 and the winding frame 8 came to be used as an integrated unit, the removal work of the winding frame 8 was abolished, and the shape change of the wound core 10 was improved, resulting in an extremely thin amorphous material. It is now possible to manufacture the desired wound core 10 even by winding a high-quality magnetic copper strip.

Next, another embodiment will be described. This is an example of use when a transformer using a wound core 9 with a winding frame 7 of the present invention is used at a high magnetic flux density due to installation location or size regulations. In this case, the winding frame side 6 is made of a thin plate material, for example, the plate thickness is 0.35 mm.
It is manufactured in a laminated form by winding grain-oriented silicon steel plates, etc. The subsequent work steps from flange welding to fabrication of the wound core are the same as those already described, and will therefore be omitted. When a transformer using this wound core is used under overload (high magnetic flux density), the amorphous magnetic steel strip portion of the wound core becomes saturated.
The winding frame also becomes part of the magnetic circuit, and the magnetic properties of the winding frame begin to affect the properties of the winding core, so laminated grain-oriented silicon steel plates with low loss and good excitation characteristics are used. This prevents the properties of the wound core from deteriorating.

Although the present invention has been described with a flange attached to the winding frame,
A similar effect can be obtained even without a flange.

〔Effect of the invention〕

As explained above, according to the present invention, an amorphous magnetic steel strip is wound around a hollow winding frame formed of a magnetic material to form a wound core that is integrated with the winding frame. It is possible to provide a method for manufacturing a wound iron core that eliminates the need to remove the winding frame, saves energy by reducing excess heat, and increases the cooling rate in magnetic field waste.

[Brief explanation of drawings]

FIG. 1 is a schematic explanatory diagram of a conventional method for manufacturing a wound core, FIG. 2 is a perspective view of a winding frame according to the present invention, and FIG. 3 is a schematic explanatory diagram of a wound core according to the present invention. 2: Amorphous magnetic steel strip 3, 10: Winding core 6: Winding frame layer 8: Winding frame (7317) Agent Patent attorney Gansuke Norichika (and 1 other person)
Figure 1 Figure 2 Figure 3

Claims (1)

[Scope of Claims] A method for manufacturing a wound iron core, characterized in that an extremely thin magnetic steel strip is wound around a hollow winding frame made of a magnetic material, and is integrated with the winding frame and annealed in a magnetic field. (2) A method for manufacturing a wound core according to claim 1, which uses a hollow winding frame made of thin magnetic material wound and laminated. (3) A method for manufacturing a wound core according to claim 1, in which a grain-oriented silicon steel strip is used as the magnetic material forming the hollow winding frame.