JPS60223104A - Core structure of transformer - Google Patents

Abstract

PURPOSE:To form the core structure of a transformer, in which the characteristics of a core are improved while the productivity of the core and a coil is enhanced, by imparting tension to the core manufactured by winding an amorphous magnetic thin-band. CONSTITUTION:A circular core is formed by circlewise winding an amorphous magnetic thin-band 5 in required number, a mandrel 1 in two halves is inserted to the inside of the circular core while rectangularly pushing said circular core by a press, etc. through a molding plate 2 from the vertical direction regarding the outside of the circular core, and only leg iron sections (b) are pushed so as to be formed to an arcuate shape, thus manufacturing an approximately rectangular wound core 11. When a coil 4 is also mounted to a leg iron section (a) for the wound core 11 and semicircular spacers 18 and tabular wedges 19 are pressed among the inner side surfaces of the yoke sections (b) for the wound core 11 and both end surfaces in the axial direction of the coil 4, tension is applied to the yoke sections (b) through the spacers 18 in the directions of the arrows. The eflection section of the amorphous magnetic thin-band generated in the leg iron section is corrected rectilinearly on the molding of the core by the tension, and the loss of the core can further be lowered.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a transformer core structure constructed by winding an amorphous magnetic ribbon.

As is well known, there has been remarkable progress in low-loss technology for iron core materials in transformers, and among these, amorphous magnetic materials are currently attracting attention as a new low-loss material. This amorphous magnetic material is made by rapidly cooling the metal from a liquid state in the manufacturing process of silicon steel strip, and during the rapid cooling, an amorphous state with disordered atomic arrangement is obtained. It is characterized by its thickness, and its magnetic properties are much better than conventional silicon steel strips. However, the amorphous magnetic material (hereinafter referred to as amorphous magnetic ribbon)
Due to its manufacturing method, it is not possible to make the plate thickness very thick, and it is extremely thin with a hardness of 20 to 30 μ2 less than //10 of the silicon copper strip, and is also highly elastic, so it can be used as an amorphous magnetic thin. There are various difficulties involved in manufacturing transformer cores using steel strips.

For example, after winding the amorphous magnetic ribbon into a circle, as shown in FIG.
After that, the rectangularly shaped iron core 3 is annealed in a magnetic field, and a reinforcing plate (not shown) is attached to the leg iron part a of the iron core 3, or an insulating tape is wound around the iron core 3. Then, the leg iron part a is held in a straight line and a coil is wound around the iron core 3, or the amorphous magnetic thin strip S is wound around the winding core B so that the leg iron part a is held in a straight line, or the amorphous magnetic thin strip S is wound around the core 3 so that the leg iron part a is held in a straight line. A rectangular iron core 3 is formed by winding the iron core 3 through a core metal, and as shown in FIG. Magnetic field annealing was performed, and then the O-leg iron part a of the iron core was reinforced with a reinforcing material e, and a coil l was wound thereon.

However, after winding an amorphous magnetic ribbon into a circular or rectangular shape, the wound iron core is formed into a rectangular core metal and a molded plate.
When the core 3 is formed and held in a rectangular shape using Because of the pressing, a large compressive force is applied to the iron core 3 during molding. By the way, in the case of an amorphous magnetic ribbon, if a compressive force like the one mentioned above is applied to the 70 ribbon, the loss will increase, and conversely, if a tensile force of an appropriate size is applied, the loss will decrease. It's becoming clear. This is especially true for film adhesion in amorphous magnetic ribbons, as shown in the characteristic diagram of the Hirochogram.

When winding a coil t around an iron core 3 wound with an amorphous magnetic ribbon, the leg iron part a of the iron core 3 is held in a straight line by a reinforcing plate (not shown), etc., but the yoke No countermeasures have been taken for the parts. As mentioned above, the amorphous magnetic ribbon is very thin and has poor rigidity, so during winding, the inner part of the yoke hangs down into the window of the iron core 3. Between coil L and I! Since the AS becomes small and often interferes with the winding work, it is necessary to install the iron core 3 by enlarging the inside dimensions of the window.

The present invention solves the above problems and improves the characteristics of the core by applying tension to the core made by winding an amorphous magnetic ribbon, and improves the productivity of the core and coil. The present invention will be explained below by way of an example in which it is applied to an uncut wound core, with reference to Figures O S to G and E.

First, the amorphous magnetic ribbon S is wound in a circle a required number of times to form a circular core, and the outside of the circular core is pressed into a rectangular shape using a press or the like through a forming plate from above and below. At the same time, insert the core metal split into two into the inside of this circular iron core, and press only the leg iron part so that the yoke part becomes arc-shaped, as shown in the diagram S. to create a nearly rectangular wound core. At this time, the wound core // is held in a substantially rectangular shape by connecting and fixing the molded plate 29.2 with a fixing bolt /Ω. Next, the wound core //
The excitation coil 3 is wound the required number of times around the leg iron part a with the core bar 2 and the molded plate 2 provided.

Next, the wound core // around which the excitation coil /3 is wound is placed in an annealing furnace filled with zero atmosphere gas such as nitrogen or argon, and the wound core // is heated while the excitation coil /3 is energized.
Magnetic field annealing is performed at a predetermined temperature range. After annealing, wound core/
/ is cooled and taken out from the annealing furnace, and excitation coil /3.
Molded plate 2. A reinforcing plate (not shown) is attached to the leg iron part a of the iron core //, or a tape is wound around it, so that the leg iron part a is fixed and held in a straight line so that it does not lose its shape.

Therefore, the leg iron part a of the wound core // is formed in a straight line, and the same side surface of the yoke part is formed in an arc shape toward the outside without hanging down. Next, when winding the coil l around the winding core //, for example, as shown in Figure 7, the winding frame /l divided into two parts is placed over one leg at of the winding core //. A drive gear /S that can be divided into a plurality of parts is fitted to both ends of the winding frame /l while maintaining the required space. gear/
When the metal fittings/B are fitted from both sides of S and these metal fittings/B are tightened with screws/7, the slope of the metal fittings/B will be aligned with the slope L formed on the inside of the drive gear/j. The driving gear /S and the winding frame /l are strongly fixed in such a state that they move in directions facing each other and press the winding frame /g toward the center. In this state, the drive gear 15 is brought into mesh with a gear (not shown) that is drive-coupled with the electric motor, and the drive gear 15
By driving the winding frame /4', the coil l is wound around the winding frame /g. After winding the coil l, the metal fitting /B and the drive gear /S fasten these. It can be easily removed from the wound core // by removing the screws holding the coil t. In addition, if the winding of the coil t fails, bend the yoke parts of the wound core // outward. So,
The inside of the yoke will not sag and cause problems with the winding work. After the other leg iron part of the wound core // is provided with a coil ring as described above, the yoke part bP3fII surface of the wound iron core // and the space between it and both axial end surfaces of the coil ring, The half-moon-shaped spacer shown in the figure (with a wide mouth) is fitted with its arcuate part also aligned with the inner surface of the iron plate,
Subsequently, a pair of plate-shaped wedges 9 shown in FIG. 5(B) are press-fitted into the gap between the flat surface of the spacer and the end surface of the coil. Tension is applied to the yoke of the wound core //, which has become arcuate due to the press-fitting of the wedge, in the direction of the arrow shown in the diagram through the spacer g. In addition, the press-fitting of the wedge/receptor also has the effect of fixing the coil, which is a means for applying tension.In addition, the spacer/f and the wedge/receptor have excellent oil resistance and mechanical strength. It is made of insulating material such as synthetic resin into a half-moon shape or wedge shape.

Although the present invention has been described with reference to an example in which it is applied to an uncut wound core, the present invention is not limited thereto, and may be applied, for example, to winding an amorphous magnetic material a required number of times to form an arc-shaped yoke. Make an iron core, fix the cutting place of the leg iron of this wound core with resin, cut the wound iron core, and then insert the leg iron of each coil and place the cut points with horse chestnut resin. After wrapping metal tape or insulating tape around the outer circumference of the core, insert a spacer and wedge between the coil and the yoke of the core to apply tension to the yoke of the core. The present invention can also be achieved even if the number is given.

As explained above, the present invention involves forming an iron nozzle made by winding an amorphous magnetic ribbon into a predetermined shape, and forming the leg iron part into an arc shape and the other part into a rectangular shape. After winding a coil around the iron part, a half-moon spacer and a wedge are press-fitted between the end face of the coil and the arc-shaped yoke part to apply tension to the yoke part of the iron core. This method uses a rectangular core metal and a molded plate to forcibly suppress the leg and yoke parts from the outside of an iron core wound with an amorphous magnetic ribbon as in the past. Unlike the case where the iron core itself is formed into a rectangular shape, unnecessary distortion is given to the iron core itself during the forming process, which increases loss, the present invention presses only the leg iron part of the iron core and creates a yoke. Since the core is formed into a nearly rectangular shape while the part remains arc-shaped, there is little or very little strain on the core during forming, so the increase in loss can be almost ignored. In addition, since the yoke part of the transformer core is formed in an arc shape, it is possible to avoid deterioration of the magnetic properties during the forming of the transformer core. A spacer having an arcuate portion that matches the arcuate surface of the yoke is press-fitted together with a wedge between the end face of the coil and the arcuate yoke, thereby forming an arcuate shape of the iron core. Since it is possible to apply tension to the yoke section,
Amorphous magnetic materials can be effectively used without impairing their properties. In particular, since the yoke is formed in an arc shape as a whole, by press-fitting the spacer, tension is applied to the yoke as a whole rather than partially, and tension is not applied to the yoke. Therefore, when forming the core, most of the deflection of the amorphous magnetic ribbon that occurs in the leg iron can be corrected into a straight line, and the core area under tension can be increased accordingly. It is possible to further reduce the loss of the iron core using the crystalline magnetic material. Furthermore, the spacer and the wedge not only apply tension to the yoke portion of the iron core, but also have the advantage that the winding can be fixed without using a special coil holding member.

[Brief explanation of drawings]

Figure 7 is a schematic diagram showing how a transformer core is wound using an amorphous magnetic ribbon, Figure 2 is a schematic plan view of a transformer core showing a conventional forming method, and Figure 113 is a diagram showing how a transformer core is wound using an amorphous magnetic ribbon. Fig. 5 is a schematic plan view showing the forming state of the transformer core of the present invention, and Fig. 5 is a schematic plan view showing the forming state of the transformer core of the present invention. A partially cutaway front view schematically showing how the transformer core is used, an off view is a perspective view showing one implementation of winding wire on the core of the present invention, and Om<h+ is a perspective view of eight spacers. , sectional view (Bl is a perspective view of the wedge. /・Core 2・Formed plate t・Coil //・Wound iron core/F・Spacer /・Wedge a・Leg iron part b・Yoke part Patent application Jinchubu Electric Power Co., Ltd. Aichi Electric Works 111 Figure 2 Figure 1I8 Figure 4 Clothes → Figure 6 D Figure 6 Figure 7a

Claims (1)

[Claims] An iron core made by winding an amorphous magnetic ribbon into a predetermined shape,
The part corresponding to the leg iron is formed into a straight line, and the part corresponding to the yoke is formed into an arc shape, forming a substantially rectangular shape.A coil is wound around the leg iron part of the iron core, and the axial direction of this coil is A half-moon-shaped spacer made of an insulating feather is fitted between the end portion and the inner surface of the yoke portion of the iron core so as to match the arcuate surface of the yoke portion, and
An iron core structure for a transformer, characterized in that a wedge is inserted into and taken out of the gap between the spacer and the end face of the coil to apply a bending force to the yoke portion of the iron core.