KR920007123Y1 - Torotidal core type transformer - Google Patents

Abstract

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Description

Troydal Core Transformer

1 is a perspective view illustrating the structure of a conventional cut core wound core transformer, (a) is an inner type, (b) is an outer type, (c) is formed of an iron core material, and (d) is an outer type transformer Indicates the assembly process of

2 is an explanatory view of the structure of the truncated Troidal core transformer, (a) is a perspective view showing the shape of the Troidal core and the low-voltage winding wound around it, (b) is a perspective view of a bobbin formed of a synthetic resin, (c ) Is a plan view showing the arrangement of low and high pressure coil blocks on the iron core.

(d) is a cross-sectional view of (c), (e) is a plan view of a transformer in which the low pressure coil is divided into a fan shape and uniformly wound and a high voltage coil block is disposed thereon.

* Explanation of symbols for main parts of the drawings

1: Core (core) 2: Winding (coil) block

2A: Low pressure coil 2B: High pressure coil

3: high pressure-low pressure coil interval 4: spacer

5: bobbin 6: cutting line of core

7: Mounting bracket 8: Body support

9: transformer outer cylinder

This design improves the structure of core and coil of small and medium-sized coil core transformers that are used as general distribution transformers (column transformers, etc.), making the existing cut-core type coil core transformers lighter and reducing losses. It relates to a no-cut troidal core transformer.

Conventional winding core transformers have an inner iron type consisting of one winding (2) and two iron cores (1) as shown in FIG. 1 (a) and an outer iron type consisting of two iron cores of one winding as shown in FIG. 1 (b). The coil is formed by winding the low pressure coil 2A on the bobbin made of an insulator (FIG. 1 (d) 5) and winding the high pressure coil 2B thereon, and then shaped as shown in FIG. The iron core material is inserted into the coil block 2 one by one and manufactured by laminating as shown in FIG.

As can be seen from FIG. 1 (a) and (b), the common point is that the coil is buried in the core, so that the heat dissipation generated in the coil is poor and the part where the core is exposed to the outside of the coil is connected to the actual winding. It does not increase the weight and iron loss as an invalid part.

In addition, in order to mold the iron core material in the shape of FIG. 1 (c), the core is subjected to winding, cutting, forming, and annealing (heat treatment: annealing). The production of the middle body is completed by the cumbersome process of inserting and stacking again and then performing a joining operation.

This Trojan core transformer designed to remedy these shortcomings has the appropriate number of low pressure coils (12 to 24) on the Trojan type iron core (1) wound around the steel core with a constant width as shown in Fig. 2 (a). ) Divided into blocks of iron cores so that they are evenly placed on the core, and the next high-pressure coil is divided into the appropriate number of blocks so that the outer core of the iron core is divided between the low pressure coil blocks and the inner circumference of the low pressure coil. It is arrange | positioned as FIG. 2 (c).

In this way, the coils are evenly distributed throughout the iron core, which increases the effective length of the iron core, thus saving material and reducing losses. The fabrication of the iron core is greatly simplified by the process of winding-edge polishing-annealing.

To explain in more detail by the relationship equation, equation (1) is the basic equation of the transformer, equation (2) represents the no-load loss (iron loss) of the transformer core and equation (3) represents the load loss (copper line).

This Trojan core type transformer has a thinner thickness of the finished winding (ie, reduced number of layers) as the windings are evenly distributed throughout the core, reducing the average length per coil (T) and thus of the same length (L). If the conductor, the number of turns T can be increased.

Then, according to equation (1), the iron core cross-sectional area A decreases by the increase rate of T in maintaining the same magnetic flux density Bm.

Accordingly, with the weight reduction of the iron core, the iron loss is reduced by Eq. (2) and the copper loss is reduced by Eq. (3).

If T is increased while leaving the cross-sectional area A intact, the magnetic flux density Bm decreases, and accordingly, the iron loss is greatly reduced by the equation (2).

In addition, due to the structure of the transformer, most of the windings are exposed, so that the heat generated from the coil is well dissipated, so the overload resistance is increased, and the thickness of the conductor can be made smaller under the same conditions, thereby saving material.

On the other hand, in the conventional cut-core transformer process, iron loss is usually increased by about 10% due to physical stress in the process of disassembling and reassembling the iron core, whereas the transformer is subjected to any physical deformation or stress after iron core annealing. Since it is assembled without load, it maintains the initial optimum state without deterioration of properties, resulting in relatively low iron loss.

Coil winding of this transformer uses a Troydal winding machine or a specially rebuilt coreless winding machine. The coil winding is divided into high insulation synthetic resins such as epoxy resins. How to make and place a bobbin such as and winding the coil therein, or by winding a coil fed the adhesive glued to the mold of the bobbin-like mold to remove the mold, using a dongdong of a certain width The winding method etc. are employ | adopted as 2 degrees (a).

In general, a transformer having a large capacity takes the method of firstly winding the low pressure coils together and arranging them evenly on the core circumference as shown in FIG. 2 (a), and then placing the high pressure coils between the low pressure coils. Instead of dividing the low pressure coils into rectangular blocks as shown in (c), two to four of them are fan-shaped as shown in Fig. 2 (e), and then uniformly wound with a general Troidal winding machine. Produce by dividing and placing.

In order to keep the high-side winding insulated from the low-voltage winding and the iron core, insert a properly processed spacer between the coil blocks and the iron core or use a bobbin such as FIG. 2 (b) in advance. Install the spacer.

When the Troy-Dal core type transformer is re-invented, it can reduce the weight, stacking, no-load loss (material loss) and material cost by 15-20% compared with the existing inlet core core transformer. Raw materials and energy saving, the weight can be reduced due to the reduction of the present invention, raw materials and energy saving, the reduction of handling labor due to weight reduction, the ripple effect is very large.

In particular, when the transformer is made of low-loss new amorphous (Amorphus) iron core material, the core thickness of the core material is 0.03 mm, which is very thin. As the degradation is accompanied, the present invention of the no-cut method dramatically improves the reworking process of the low loss transformer using amorphous cores.

In addition, conventional cut-core transformers cannot reuse cores for repairs that require re-winding due to coil breaks, burnouts, breakdowns, etc. In any case, the core has the advantage of being reusable without machining.

This can have the effect of reducing the maintenance costs of transformers for utilities that manage a large number of transformers.

Claims (5)

The steel coil for a certain width is wound in a cylindrical shape, and the edges are polished to a curved surface, and then the low pressure coil 2A is applied to an appropriate number of blocks as shown in FIG. 2 (c). After dividing and winding them evenly, the high-pressure coil 2B is also divided into an appropriate number of blocks. A troidal core transformer arranged to overlap on a coil, and to overlap on a high pressure coil by a properly processed spacer, and to maintain an insulation gap of the high pressure coil (2B) by a properly processed spacer. The coil block of the above paragraph 1 is formed by winding a tape-shaped conductor having a constant width with a sinus. The coil block of claim 1 is formed by winding a conductor on a bobbin made of a highly insulating material as shown in FIG. The coil block of claim 1 is formed by feeding the insulating adhesive or synthetic resin into the conductor and solidifying it. In the above 1, the low-pressure coil (2A) is divided into a fan shape as shown in Figure 2 (e) uniformly wound on the iron core, and the high-pressure coil (2B) thereon divided into a plurality of blocks by the method of claim 1 disposed thereon Type transformer.