JPH02192105A - Wound core type stationary electric apparatus - Google Patents

Abstract

PURPOSE:To enhance the regidity of wound core excellently without lowering the magnetic characteristics and quality of an amorphous magnetic alloy thin band by a method wherein a wound core is supported and fixed by applying clamping force in widthwise direction, not in vertical direction of the wound core. CONSTITUTION:An amorphous magnetic alloy thin band 1 is wound around, a wound core 2 is constituted in such a manner that the two wound cores 2a and 2b, which are formed in rectangular shape, are arranged in combination in widthwise direction, and a winding 2 is attached to both legs of said wound cores 2. The wound cores 2a and 2b are clamped and fixed using side plates 10a and 10b, consisting of L-shaped bent non-magnetic plate (stainless steel for example) and clamps 9 and 11 located on the upper and the lower parts, and the wound cores 2a and 2b are constructed in such a manner that clamping force will be applied in widthwise direction of the core, and no force is applied in the vertical direction of them. As a result, no shifting in widthwise direction of the wound cores is generated by excitation vibration and mechanical vibration, the wound cores are not damaged, their magnetic characteristics are not deteriorated, and the excellent characteristics of the amorphous magnetic alloy thin film can be maintained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a wound iron core type stationary induction appliance made of an amorphous magnetic alloy ribbon.

(Prior Art) Recently, conventional grain-oriented silicon steel strips have been replaced as core materials for wound cores in stationary induction electric appliances such as transformers and reactors.
The use of amorphous magnetic alloy ribbons is being considered.

This amorphous magnetic alloy ribbon is manufactured by ultra-quenching a molten alloy, and has excellent magnetic properties with significantly lower iron loss and excitation current than silicon steel strips. On the other hand, the thickness of amorphous magnetic alloy ribbon is 30/j due to manufacturing reasons! /
/l, it is about 1/10 thinner than a silicon steel strip, and its width is also narrow for the same reason. For this reason, there is a problem in that a wound core formed by winding an amorphous magnetic alloy ribbon has low rigidity. Therefore, in order to improve the workability of the process of attaching the winding to the wound core and assembling it when manufacturing stationary induction electric appliances, such as transformers, using a wound core made of amorphous magnetic alloy ribbon,
It is necessary to strengthen the wound core to increase its rigidity.

As a wound core structure using an amorphous magnetic alloy ribbon, an uncut wound core that generally does not have a rectangular joint portion is often adopted. However, in the case of an uncut wound core, the winding must be directly wound around the legs of the wound core, which not only makes the winding work difficult, but also makes it difficult to It is necessary to use a stepped core that makes the cross section nearly circular. Manufacturing a wound core with such a multi-stage configuration has the disadvantage that the manufacturing process is complicated and workability is poor. In addition, since a gear for driving the cylinder is required during the winding work, the height of the iron core window must be increased, resulting in disadvantages such as an increase in the size and weight of the equipment.

Therefore, a joint method has been proposed in which one joint portion is provided for each turn of the iron core.

When a compressive force is applied to a wound core using an amorphous magnetic alloy ribbon in the vertical direction of the core (or in the direction of the thickness of the ribbon from above and below in the case of a rectangular wound core), the bending rigidity is small, so the iron loss characteristics worsen. . Therefore, it is necessary to adopt a structure that does not apply compressive force in the vertical direction of the iron core.

Conventionally, as shown in FIGS. 7 to 10, the clamping structure of a wound core made of an amorphous magnetic alloy ribbon has been used to clamp an upper yoke part and a lower part of a rectangular wound core 2 in which a winding 3 is arranged. The upper clamp 5 and the lower clamp 4 form the yoke part from the outside.
covered with Then, one end of the stud 6 is screwed into the nut 8 attached to the lower clamp 4, the other end is passed through the upper clamp 5, and the nut 8 is tightened through the washer 7, thereby connecting the lower clamp 4 and the upper clamp 5 to the wound core. 2 is supported and fixed.

(Problem to be solved by the invention) However, the support structure for such a wound core has the following (
There are drawbacks as shown in 1) to (3).

(1) The lower clamp 4 and the upper clamp 5 are integrally formed over the entire width direction of the wound core 2, and the clamps 4 and 5 prevent any tightening force from being applied in the width direction of the wound core 2, and the lower clamp 4 By tightening the yoke portion of the wound core 2 from above and below using the stud 6 and nut 8, the upper clamp 5 applies compressive force to the core legs and core corner portions. Since the amorphous magnetic alloy ribbon 1 has a property that it is more sensitive to strain due to compressive force than a grain-oriented silicon steel plate, the core loss characteristics deteriorate when force is applied from above and below the core. FIG. 10 is a diagram showing the relationship between the clamping force applied to the wound core from above and below and the iron loss (W/Kg) obtained through experiments. According to this line section, it can be seen that as the compressive force (bending stress) applied to the iron core from above and below increases, the iron loss greatly deteriorates.

(2) Because amorphous magnetic alloy ribbons are manufactured using an ultra-quenching method, their width is narrow, and unless the core is of small capacity, it is not possible to secure the width of a wound core with the width of a single ribbon. In many cases, it is constructed by combining a plurality of wound cores wound with amorphous magnetic alloy ribbons. FIG. 9 shows a configuration in which two lap joint wound cores (2a, 2b) are arranged in the core width direction. When this core is supported by the core support structure shown in FIGS. 7 and 8, the lower clamp 4 and the upper clamp 5
Since the parts covering both sides of the wound core 2 are integrally molded and do not apply a tightening force to the wound core in the width direction, the combined wound core 2 cannot be tightened and fixed from the width direction. Therefore, when external forces such as mechanical vibrations or earthquakes that occur during transportation of the transformer are applied, the wound core 2 moves slightly in the width direction, resulting in deterioration of the magnetic properties of the wound core 2 and a part of the end face of the core. There is a risk of damage. In particular, amorphous magnetic alloy ribbons tend to become brittle when subjected to strain relief annealing and are therefore easily damaged, and if they are damaged, the quality of the wound core will be degraded. Roughly speaking, since the amorphous magnetic alloy ribbon 1 is about 1/10 thinner than the grain-oriented silicon steel strip, the rigidity of the wound core 2 is low, and the core is easily deformed when the above-mentioned external mechanical force is applied. Particularly in FIG. 7, when an external force in the horizontal direction is applied, bending stress is applied to the core legs, deteriorating the magnetic properties.

(3) Upper clamp 5 and lower clamp 14 on the outside of winding 3
Since the space is tightened with studs 6, the floor space becomes large.

The present invention has been made in order to solve the above-mentioned drawbacks, and the object thereof is to improve the rigidity of the wound core without degrading the magnetic properties and quality of the amorphous magnetic alloy ribbon. It provides electrical appliances.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention provides a wound core in which a winding is attached to a rectangular wound core formed by winding an amorphous magnetic alloy ribbon. In the type stationary induction electric appliance, a pair of side plates bent into a single character shape are respectively disposed at the outer corners of both legs of the wound core, and a pair of clamps are respectively disposed at the upper and lower portions of the wound core. The present invention is characterized in that the upper and lower clamps are configured to tighten the wound core in the width direction via the side surface abutting plates.

(Function) According to the wound iron core type stationary induction electric appliance of the present invention, the tightening force of the wound iron core is not applied in the vertical direction of the wound iron core, but is supported and fixed in addition to the width direction of the wound iron core, so that there is no excitation movement. There is no deviation in the width direction of the winding core due to mechanical vibration, and there is no damage to the winding core or deterioration of magnetic properties. In addition, since the side plate is L-shaped, the plate itself has high rigidity, and the lower and upper clamps tighten the winding core through it, making it an integrated structure. It also has improved rigidity and has sufficient strength to withstand vibrations during transportation and earthquakes. Furthermore, since the side contact plate is L-shaped, it can be made relatively thin and can be placed in a small space within the insulating cylinder of the wound core and winding, making the device smaller and lighter. be able to.

(Example) Embodiments of the present invention will be described with reference to the drawings.

Figure 1 is a front view of one embodiment of the present invention, Figures 2 and 3 are
The figures are a right side view and a plan view of FIG. 1, respectively. In these figures, a wound core 2a is formed by winding an amorphous magnetic alloy ribbon 1 and forming it into a rectangular shape.

2b are arranged in the width direction and combined to form the wound core 2,
A winding 3 is attached to both legs of this wound core 2. Here, the wound cores 2a and 2b are the side surface abutting plates 10a.

10b and upper and lower clamps 9 and 11 are tightened and fixed. The side part contact plates 10a and 10b are shown in FIG. 5(a), (
As shown in b) and (c), it is made of a non-magnetic plate (for example, stainless steel) bent into a single character shape, and has a boss 16 at the lower end and a hole 17 at the upper end. The boss 16 and the hole 17 are provided on a surface that is in contact with the core width direction. Although there is no particular restriction on the X dimension of the side abutment plates 10a, 10b, the Y dimension is set to a value smaller than 1/2 of the width of the core to be tightened (10 to 20.).

On the other hand, the upper clamp 11 is made of a steel plate bent into a single shape as shown in FIGS. 6(a) and 6(b), and has bosses 18 at both ends that fit into holes in the side plates 10a and 10b.
．． 18 is the provision. The lower clamp 9 is made of a steel plate with a cross-sectional shape, and has side plates 10a, 10 at both ends.
A hole (not shown) is provided in which the boss 16.16 of b is fitted. Then, as shown in FIG. 4, each pair of side surface contact plates 10a, 10b are placed on the lower side within the insulating cylinder of the winding 3 so as to be respectively disposed at the corner portions outside both legs of the wound cores 2a, 2b. After that, insert each pair of side plate IOA,
A pair of lower clamps 9 are arranged so as to sandwich the lower end of the iob from the outside, and the bosses 16 of the side abutting plates 10a and 10b are fitted into holes provided in the lower clamps 9. Next, the lower clamp 9 is tightened with the stud 15 and nut 8, and the lower cross bar 12 and base 13 are attached.

On the other hand, the pair of upper clamps 11 are side part contact plates 10a.

The bosses 16 provided at the ends of the lower end portions of the lower end portions 10b are inserted into the holes of the side contact plates 10a and 10b. Then, the stud 15 and nut 8 are used to tighten the upper clamps 11, and the upper cross spar 14 further integrates the upper clamps 11.

Although the bosses 16 are provided at the lower ends of the contact plates 10a and 10b, they may be provided only at the upper ends, or holes may be provided at both ends. In other words, even if the space between the core leg width direction and the short side of the winding insulating cylinder is made small, it is possible to utilize that space to insert the side surface contact plates 10a and 10b inside the winding insulating cylinder. do it.

As described above, according to this embodiment, since the structure is such that the clamping force is applied in the core width direction and no force is applied in the vertical direction of the wound cores 2a and 2b, the advantages of the amorphous magnetic alloy ribbon 1 can be improved. The magnetic properties (iron loss, excitation capacity) can be maintained. The side surface contact plates 10a, 10b, the upper and lower clamps 9, 116, and the upper and lower crossbars 12.14 are integrally connected, and the side surface contact plates 10a, 10b are formed in a tapered shape, which increases the rigidity of the equipment. The wound core 2a has high rigidity in the longitudinal and lateral directions, and is resistant to vibrations and shocks caused by external forces.
The stress applied to 2b becomes smaller. Therefore, the wound core 2a,
The influence on the magnetic properties of 2b is small and stable quality is guaranteed. Furthermore, since the upper and lower clamps 9 and 11 are connected by side plates 10a and 10b disposed within the winding insulating cylinder, there are many advantages such as miniaturization.

In this embodiment, two wound cores are combined, but it goes without saying that the present invention can also be applied to a combination of one or three or more wound cores.

[Effects of the Invention] As explained above, according to the wound core type stationary induction electric appliance of the present invention, there is no deviation in the width direction of the wound core due to excitation vibration or mechanical vibration, which may damage the wound core or deteriorate magnetic properties. Never. In addition, since the side plate is L-shaped, the plate itself has high rigidity, and the lower and upper clamps tighten the winding core through it, making it an integrated structure. Its rigidity has also been improved, making it strong enough to withstand photographing during transportation, earthquakes, etc. Furthermore, since the side contact plate is L-shaped, it can be made relatively thin and can be placed in a small space within the insulating cylinder of the wound core and winding, making the device smaller and lighter. be able to.

[Brief explanation of the drawing]

Figure 1 is a front view of one embodiment of the present invention, Figures 2 and 3 are
The figures are the right side view and plan view of Fig. 1, Fig. 4 is a sectional view taken along the line IV-IV of the transformer shown in Fig. 1, and Figs. 5 (a) and (1).
) and (C) are side views of the side plate used in the present invention,
6(a) and 6(b) are front and side views of the upper clamp used in the present invention, and FIGS. 7 and 8 are front and side views of a conventional wound core transformer. Figure 9 is a perspective view of two conventional wound cores arranged side by side.
Figure 0 is a diagram showing the relationship between core clamping force and core loss in an amorphous magnetic ribbon-wound core. 1...Amorphous magnetic alloy ribbon 2a, 2b...Wound core 3...Winding 8...Nut 9...Lower clamp 10a, 10b...Side part backing plate 11...・Upper clamp 12...Lower cross par 13...Base 14...Upper cross par 15...Stud 16...Boss (8733) Agent Patent attorney Yoshiaki Inomata (Baka
1 person)

Claims (1)

[Claims] (1) In a wound core type stationary induction electric appliance in which a winding is attached to a rectangular wound core made by winding an amorphous magnetic alloy ribbon, L
A pair of side plates bent in a letter-like shape are respectively disposed at the outer corners of both legs of the core, and a pair of clamps are respectively disposed at the upper and lower portions of the core, and the upper and lower clamps are used to secure the side surfaces of the core. A wound core type stationary induction electric appliance characterized in that it is configured to be tightened in the width direction of the wound core through a parting plate.