CN221304433U - Transformer with compact coil - Google Patents

Abstract

The utility model relates to a transformer with a compact coil, which comprises an I-shaped framework, an iron core and a coil, wherein the I-shaped framework is fixedly arranged on the iron core, the coil is wound on the I-shaped framework, and the number of lead wires of the coil is an integer layer within the allowable range of the magnetic flux density of the iron core. The transformer with the compact coil adopts the coil formed by the I-shaped framework, the wires and the insulating paper, and the coil tension device of the winding machine enamelled wire is reasonably controlled by optimizing the number of turns, reasonably arranging the wires, ensuring that the wires are orderly arranged with minimum gaps and the number of layers, keeping the compactness and the minimum thickness of the wound coil, so that the volume of the coil is minimum, and solving the problem of the integral volume increase of the transformer caused by the bulkiness of the traditional wound coil.

Description

Transformer with compact coil

Technical Field

The utility model relates to the field of transformers, in particular to a transformer with a compact coil.

Background

The transformer is a device for changing ac voltage by using the principle of electromagnetic induction, and is a main component of a power converter, and its main components are a coil and an iron core. When the transformer coil is manufactured, the coil is often caused to be bloated due to factors such as the number of turns and the wire gauge, the assembly of the iron core is affected, and the iron core has to be enlarged to be put into the coil when serious. Meanwhile, the wire package is bulky, so that various electrical properties and mechanical properties are greatly adversely affected, and the economic cost is increased.

Disclosure of utility model

In order to solve the technical problems in the prior art, the utility model provides a transformer with a compact coil, which is wound into a minimum volume through optimizing the number of turns, reasonable wire gauge, moderate tension, interlayer gaskets, voltage-resistant insulation treatment and the like.

In order to achieve the above purpose, the technical solution of the present utility model is as follows:

A transformer with compact coils comprises an I-shaped framework, an iron core and coils, wherein the I-shaped framework is fixedly arranged on the iron core, the coils are wound on the I-shaped framework, and the number of lead wires of the coils is an integer number of layers within the allowable range of the magnetic flux density of the iron core, namely, each layer is just full of lead wires.

As a preferred technical solution, the wire gauges of the coils of the single-phase transformer are combined in series-parallel connection.

As a preferred embodiment, the wire gauges of the three-phase transformer coils are combined in a delta or star connection.

As a preferred technical solution, when winding the coil, the wire of the latter layer is wound around the recess of the former layer.

As a preferred technical solution, when winding the coil, the end of the wire is connected with a tension device of the winding machine.

Compared with the prior art, the utility model has the beneficial effects that:

The transformer with the compact coil adopts the coil formed by the I-shaped framework, the wires and the insulating paper, and the coil tension device of the winding machine enamelled wire is reasonably controlled by optimizing the number of turns, reasonably arranging the wires, ensuring that the wires are orderly arranged with minimum gaps and the number of layers, keeping the compactness and the minimum thickness of the wound coil, so that the volume of the coil is minimum, and solving the problem of the integral volume increase of the transformer caused by the bulkiness of the traditional wound coil.

Drawings

Fig. 1 is a schematic view of the structure of an i-shaped bobbin in a transformer with a tight coil of the present utility model;

FIG. 2 is a schematic diagram of the winding pattern of a coil in a transformer with a compact coil according to the present utility model;

fig. 3 is a schematic diagram of a voltage withstand process of a transformer with a tight coil of the present utility model;

Fig. 4 is a schematic diagram of tension control of a transformer with tight coils of the present utility model.

In the figure: 1. an I-shaped framework; 2. an iron core; 3. a coil; 31. a wire; 4. and (3) adhesive tape.

Detailed Description

The technical scheme of the utility model is further described below with reference to the specific embodiments:

As shown in fig. 1, a transformer with a compact coil 3 comprises an i-shaped framework 1, an iron core 2 and the coil 3, wherein the i-shaped framework 1 is fixedly arranged on the iron core 2, so that the maximum winding width is ensured, the winding layer number is reduced, the thickness of a coil is effectively reduced, and the space of winding, namely the width, which is wasted because the end spaces of two ends of the coil need to be left and taken, is avoided. The iron core 2 is made of silicon steel sheet. The coil 3 is wound on the I-shaped framework 1, and the number of turns of the wire 31 of the coil 3 is an integer number of layers within the allowable range of the magnetic flux density of the iron core 2, namely, each layer is just full of the wire 31, so that unnecessary gaps which are regarded as obvious waste are reduced, the space factor of an iron core window is improved, the tightness in the true sense is achieved, and the number of layers is reduced to compress the thickness of a coil.

In this embodiment, on the premise of optimizing the number of turns of the coil 3, the wire gauge is thinned in principle, and the combination of different wire gauges is considered to achieve the integer layer during design, the wire gauges of the single-phase transformer coil 3 are combined in a series-parallel connection mode, and the wire gauges of the three-phase transformer coil 3 are combined in a triangle or star connection mode so as to ensure that the integer layer, i.e. each layer is just full of wires 31.

In this embodiment, when the insulating material is used for the coil 3 of the transformer, the insulating material with high withstand voltage is selected on the premise of meeting withstand voltage so as to reduce the number of layers of the insulating material, and ensure that the thickness of the coil 3 is not too thick due to the multipurpose insulating material. The interlayer insulation is made of an extremely thin insulating material to reduce the increase in thickness of the coil 3 due to the number of layers of the coil 3.

When winding the coil 3, as shown in fig. 2, a hexagonal winding mode is selected, the original square winding mode is changed, and the wire 31 of the next layer is wound in the recess of the previous layer. This winding method ensures the most compact possible filling of the wire 31, theoretically obtaining a filling factor of 0.907, increasing the compactness of the coil 3.

As shown in fig. 3, the conventional primary-secondary withstand voltage process is that a sufficient gap is left between the primary and secondary, and the winding space is wasted. In this embodiment, when the transformer processes the creepage distance and the electric gap of the primary and secondary withstand voltage, the traditional method of reserving gaps is abandoned, and the insulating tape 4 is used for large-distance isolation, so that the method does not waste winding space, and can ensure the primary and secondary withstand voltage. And meanwhile, the reasonable interlayer insulation thickness is selected on the premise of ensuring interlayer voltage resistance.

As shown in fig. 4, when winding the coil 3, the end of the wire 31 is connected to a tension device of a winding machine. The tension device controls the moderate tension so as to eliminate the obesity of the coil 3 caused by the gap of the wire gauge which cannot be tightly attached to the framework 1. Simultaneously, the enameled wire 31 of each layer is pressed on one side of winding, so that the compactness of the coil 3 is ensured.

The present embodiment is further illustrative of the present invention and is not to be construed as limiting the invention, and those skilled in the art can make no inventive modifications to the present embodiment as required after reading the present specification, but only as long as they are within the scope of the claims of the present invention.

Claims (5)

1. The transformer with the compact coil is characterized by comprising an I-shaped framework, an iron core and a coil, wherein the I-shaped framework is fixedly arranged on the iron core, the coil is wound on the I-shaped framework, and the number of lead wires of the coil is an integer layer within the allowable range of the magnetic flux density of the iron core.

2. A transformer with compact coils according to claim 1, characterized in that the wire gauges of the single-phase transformer coils are combined in series-parallel.

3. A transformer with compact coils according to claim 1, characterized in that the wire gauges of the three-phase transformer coils are combined in a delta-or star-connection.

4. A transformer with tight coil according to claim 1, characterized in that the wires of the latter layer are wound in the recesses of the former layer when winding the coil.

5. A transformer with tight coil according to claim 1, characterized in that the ends of the wire are connected to the tension means of the winding machine when winding the coil.