CN117976377A - Transformer coil with half-turn structure, winding method and transformer - Google Patents

Abstract

The invention discloses a transformer coil with a half-turn structure, a winding method and a transformer, which comprises a three-dimensional wound core and a coil, wherein the three-dimensional wound core is formed by splicing three single frames, and the vertical frame edges of two adjacent single frames are fixedly connected together in a fitting way to form a core column; the coil is arranged on the three-dimensional coiled iron core, the coil comprises an integer coil and a half coil, the integer coil and the half coil form a closed loop on a core column, the integer coil and the half coil are wound on the same core column, and the tail head leading-out position of the half coil and the head starting position of the coil are respectively positioned on two sides of the same single frame. Based on this, through coiling half circle coil on single frame, and half circle coil's tail head draws forth position and the beginning position of coil and be located the both sides of same single frame respectively for three-phase transformer can contain half circle structure's transformer coil, is favorable to the cost optimization and the technological innovation to three-phase transformer.

Description

Transformer coil with half-turn structure, winding method and transformer

Technical Field

The embodiment of the invention relates to the technical field of power equipment, in particular to a transformer coil with a half-turn structure, a winding method and a transformer.

Background

Transformers are devices that use the principle of electromagnetic induction to transfer electrical energy, and are typically wound with copper or aluminum wire. When the transformer is designed, the number of turns of the low-voltage coil is usually determined, and then the number of turns of the high-voltage coil is calculated according to the data of the number of turns of the low-voltage coil, rated voltage, connection group and the like, and the determination of the number of turns of the transformer coil has an important influence on the cost of the transformer.

At present, coils of the existing three-phase transformers are basically wound according to integer turns, so that the three-phase transformers can perform voltage calculation according to the integer turns, but the transformer coils wound by the integer turns also have certain limitations on cost design of the three-phase transformers, and are not beneficial to cost optimization and technical innovation of the three-phase transformers.

Disclosure of Invention

The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.

The embodiment of the invention provides a transformer coil with a half-turn structure, a winding method and a transformer, so that a three-phase transformer can comprise the transformer coil with the half-turn structure, and the cost optimization and the technical innovation of the three-phase transformer are facilitated.

In a first aspect, an embodiment of the present invention provides a transformer coil including a half turn structure, including:

the three-dimensional wound iron core is formed by splicing three single frames, and the vertical frame edges of two adjacent single frames are fixedly connected together in an attaching mode to form a core column;

The coil is arranged on the three-dimensional coiled iron core, the coil comprises an integer-turn coil and a half-turn coil, the integer-turn coil and the half-turn coil are wound on the same core column, the tail end leading-out position of the half-turn coil and the starting position of the coil are respectively positioned on two sides of the same single frame, and the integer-turn coil and the half-turn coil form a closed loop.

In some embodiments, the tail end lead-out position of the half turn coil is located inside the single frame, and the start position of the coil is located outside the same single frame; or the tail end leading-out position of the half-turn coil is positioned at the outer side of the single frame, and the starting position of the coil is positioned at the inner side of the same single frame.

In some embodiments, the transformer is a three-phase distribution transformer, and the three cores are single-frame-spliced into three core columns.

In some embodiments, the coil comprises a high voltage coil and a low voltage coil, both of which are wound around the stem.

In some embodiments, the high voltage coil and/or the low voltage coil comprises the half turn coil.

In some embodiments, three phases of the half turn coil are wound on the stem.

In some embodiments, an insulator is disposed between the coil and the solid wound core.

In some embodiments, the voltage calculation formula for the coil is as follows:

u=4.44 f (n+0.5) BS, where U is the voltage of the coil, f is the frequency, N is the number of turns of the closed loop with the cylinder, B is the magnetic flux density, and S is the cross-sectional area of the cylinder.

In a second aspect, an embodiment of the present invention provides a transformer, including a transformer coil including a half-turn structure as described in the first aspect.

In a third aspect, an embodiment of the present invention provides a winding method of a transformer coil including a half turn structure, including:

S1: placing a three-dimensional wound iron core on winding equipment, wherein the three-dimensional wound iron core is formed by splicing three single frames, and the vertical frame edges of two adjacent single frames are fixedly connected together in a fitting manner to form a core column;

s2: mounting a winding die on the core column;

S3: fixing the start of the coil on the winding mould;

S4: winding an integer turn coil and a half turn coil, enabling the tail head of the half turn coil to pass through one single frame to form a closed loop, wherein the tail head leading-out position of the half turn coil and the starting position of the coil are respectively positioned at two sides of the same single frame;

s5: and (4) finishing winding of the three coils corresponding to the single frame according to the step S4.

The embodiment of the invention provides a transformer coil with a half-turn structure, which comprises a three-dimensional wound core and a coil, wherein the three-dimensional wound core is formed by splicing three single frames, and the vertical frame edges of two adjacent single frames are fixedly connected together in an attaching way to form a core column; the coil is arranged on the three-dimensional coiled iron core, the coil comprises an integer coil and a half coil, the integer coil and the half coil form a closed loop on a core column, the integer coil and the half coil are wound on the same core column, and the tail head leading-out position of the half coil and the head starting position of the coil are respectively positioned on two sides of the same single frame. The embodiment of the invention also provides a winding method of the transformer coil with the half-turn structure, which comprises the steps of placing the three-dimensional wound iron core on winding equipment, wherein the three-dimensional wound iron core is formed by splicing three single frames, and the vertical frame edges of two adjacent single frames are fixedly connected together in a fitting way to form a core column; mounting a winding die on the stem; fixing the start of the coil on a winding mold; winding an integer turn coil and a half turn coil, enabling the tail head of the half turn coil to pass through one single frame to form a closed loop, wherein the tail head leading-out position of the half turn coil and the starting head position of the coil are respectively positioned at two sides of the same single frame; and (5) finishing winding of the three single-frame corresponding coils according to the steps. Based on this, through coiling half circle coil on single frame, and half circle coil's tail head draws forth position and the beginning position of coil and be located the both sides of same single frame respectively for three-phase transformer can contain half circle structure's transformer coil, is favorable to the cost optimization and the technological innovation to three-phase transformer.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate and do not limit the invention.

Fig. 1 is a schematic structural view of a three-dimensional wound core according to an embodiment of the present invention;

Fig. 2 is a schematic structural diagram of a transformer coil including a half-turn structure according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a three-phase perspective wound core flux distribution according to an embodiment of the present invention;

Fig. 4 is a flowchart of a winding method of a transformer coil including a half turn structure according to an embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

It should be understood that in the description of the embodiments of the present invention, plural (or multiple) means two or more, and that greater than, less than, exceeding, etc. are understood to not include the present number, and that greater than, less than, within, etc. are understood to include the present number. If any, the terms "first," "second," etc. are used for distinguishing between technical features only, and should not be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the prior art, coils of the existing three-phase transformer are basically wound according to integer turns, so that the three-phase transformer can perform voltage calculation according to the integer turns, but the transformer coils wound by the integer turns also have certain limitations on the cost design of the three-phase transformer, and are not beneficial to cost optimization and technical innovation of the three-phase transformer.

Aiming at the problems in the prior art, the embodiment of the invention provides a transformer coil with a half-turn structure, which comprises a three-dimensional wound core and a coil, wherein the three-dimensional wound core is formed by splicing three single frames, and the vertical frame edges of two adjacent single frames are fixedly connected together in a fitting way to form a core column; the coil is arranged on the three-dimensional coiled iron core, the coil comprises an integer coil and a half coil, the integer coil and the half coil form a closed loop on a core column, the integer coil and the half coil are wound on the same core column, and the tail head leading-out position of the half coil and the head starting position of the coil are respectively positioned on two sides of the same single frame. The embodiment of the invention also provides a winding method of the transformer coil with the half-turn structure, which comprises the steps of placing the three-dimensional wound iron core on winding equipment, wherein the three-dimensional wound iron core is formed by splicing three single frames, and the vertical frame edges of two adjacent single frames are fixedly connected together in a fitting way to form a core column; mounting a winding die on the stem; fixing the start of the coil on a winding mold; winding an integer turn coil and a half turn coil, enabling the tail head of the half turn coil to pass through one single frame to form a closed loop, wherein the tail head leading-out position of the half turn coil and the starting head position of the coil are respectively positioned at two sides of the same single frame; and (5) finishing winding of the three single-frame corresponding coils according to the steps. Based on this, through coiling half circle coil on single frame, and half circle coil's tail head draws forth position and the beginning position of coil and be located the both sides of same single frame respectively for three-phase transformer can contain half circle structure's transformer coil, is favorable to the cost optimization and the technological innovation to three-phase transformer.

As shown in fig. 1, fig. 1 is a schematic structural diagram of a transformer coil with a half-turn structure, taking a three-phase distribution transformer as an example, the three-phase distribution transformer includes a three-dimensional wound core 100 and a coil 200, and as shown in fig. 2, the three-dimensional wound core 100 is formed by splicing three single frames 110, and the vertical frame edges of two adjacent single frames 110 are fixedly connected together in an attaching manner to form a core column 120, so that three core columns 120 are formed. As shown in fig. 1, the coil 200 is disposed on the three-dimensional wound core 100, the coil 200 includes an integer-turn coil forming a closed loop at the leg 120 and a half-turn coil forming a closed loop at the single frame 110, the integer-turn coil and the half-turn coil are wound on the same leg 120, and a tail end lead-out position of the half-turn coil and a start position of the coil 200 are respectively located at both sides of the same single frame 110. It should be noted that the half-turn coil includes, but is not limited to, a half-turn coil, for example, the half-turn coil may be a third-turn coil or a two-thirds-turn coil. Therefore, the half-turn coil is wound on the single frame 110 and forms a closed loop on the stem 120, and the tail end leading-out position of the half-turn coil and the beginning position of the coil 200 are respectively located at two sides of the same single frame 110, which belongs to the half-turn coil. As shown in fig. 1, a, b, and c respectively indicate the start positions of the three-phase coils 200, and x, y, and z respectively indicate the end extraction positions of the half-turn coils corresponding to the three phases.

In some embodiments, the tail end lead-out position of a half turn coil is located inside a single frame 110, and the beginning position of coil 200 is located outside the same single frame 110; or the tail end leading-out position of the half turn coil is positioned at the outer side of the single frame 110, and the starting position of the coil 200 is positioned at the inner side of the same single frame 110. As shown in fig. 1, a, b, and c respectively indicate the start positions of the three-phase coils 200, the start positions of the coils 200 are located at the outer sides of the single frame 110, x, y, and z respectively indicate the tail end extraction positions of the half-turn coils corresponding to the three phases, and the tail end extraction positions of the half-turn coils are located at the inner sides of the single frame 110. Similarly, in other embodiments, a, b, c respectively indicate that the beginning positions of the three-phase coils 200 may be located inside the single frame 110, and x, y, z respectively indicate that the end-to-end exit positions of the corresponding three-phase half turn coils are located outside the single frame 110.

In some embodiments, as shown in fig. 1, the transformer is a three-phase distribution transformer, and the three core single frames 110 are spliced into three poles 120, so as to achieve three-phase winding of the coil 200.

In some embodiments, as shown in fig. 1, the coil 200 includes a high voltage coil 220 and a low voltage coil 210, both the high voltage coil 220 and the low voltage coil 210 being wound around the stem 120, wherein the high voltage coil 220 has a high voltage and the low voltage coil 210 has a low current. The high-voltage coil 220 has a large number of turns, the wire diameter is small, the low-voltage coil 210 has a small number of turns, and the wire diameter is large. For example, in a three-phase distribution transformer, typically, half turns of the coil are disposed on the low-voltage coil 210, the low-voltage coil 210 is disposed inside the coil 200, the high-voltage coil 220 is disposed outside the coil 200, and the low-voltage coil 210 is surrounded by the high-voltage coil 220.

In some embodiments, as shown in fig. 1, at least one of the high voltage coil 220 and the low voltage coil 210 comprises a half turn coil.

In some embodiments, as shown in fig. 1, three-phase half-turn coils are wound on the stem 120 to achieve three-phase half-turn coil winding.

In some embodiments, an insulating member is disposed between the coil 200 and the solid wound core 100, and the insulating member may isolate the coil 200 from the solid wound core 100, thereby providing an insulating effect.

In some embodiments, three-phase volume wound core 100 flux distribution is shown in fig. 3, Φa=Φac- Φba, Φb=Φba- Φcb, Φc=Φcb- Φac. According to a voltage calculation formula of the transformer: u=en=4.44 fN phi, where U is the coil 200 voltage, E is the turn voltage, F is the frequency, N is the number of turns forming a closed loop with the stem 120, and phi is the magnetic flux. And according to the flux formula: phi=bs, and therefore u=en=4.44 fNBS, where B is the magnetic flux density and S is the cross-sectional area of the stem 120.

It should be noted that, when the transformer is designed normally, the design magnetic density of the transformer is generally greater than 1.0T, so that in general, the magnetic flux wave in the single frame of the three-dimensional wound core will be distorted, and the maximum magnetic density B _AC,B_CB,B_BA in the single frame is equal to the magnetic density B _A,B_B,B_C in the stem 120, so that if one of the coils forms a closed loop with one of the single frames, a half turn voltage can be obtained, as shown in the following formula:

e _{Single frame} ＝4.44fBS _{Single frame} ＝1/2×4.44fBS＝e/2

Wherein, S _{Single frame} : the section of the single iron core frame is S _{Single frame} which is 1/2 of the section of the core column.

According to the characteristics of the three-dimensional wound core, when one turn of coil in the coil and only one single frame form a closed loop, the coil voltage can be calculated according to the following formula:

U＝4.44f(N+0.5)BS

therefore, according to the method, the voltage of the coil 200 containing the half-turn coil can be calculated, the technical problem that the traditional transformer cannot be calculated according to the half-turn coil is solved, and the method has important significance for cost optimization and technical innovation of the transformer.

Based on this, through coiling half circle coil on single frame, and half circle coil's tail head draws forth position and the beginning position of coil and be located the both sides of same single frame respectively for three-phase transformer can contain half circle structure's transformer coil, can realize half circle coiling in the physical computing, is favorable to the cost optimization and the technological innovation to three-phase transformer.

The embodiment of the invention also provides a transformer which comprises the transformer coil with the half-turn structure.

In an embodiment, the transformer uses the transformer coil with the half-turn structure, so the transformer can achieve the same technical effects as the transformer coil with the half-turn structure. The transformer comprises a three-dimensional wound iron core and a coil, wherein the three-dimensional wound iron core is formed by splicing three single frames, and the vertical frame edges of two adjacent single frames are fixedly connected together in an attaching way to form a core column; the coil is arranged on the three-dimensional coiled iron core, the coil comprises an integer coil and a half coil, the integer coil and the half coil form a closed loop on a core column, the integer coil and the half coil are wound on the same core column, and the tail head leading-out position of the half coil and the head starting position of the coil are respectively positioned on two sides of the same single frame. Based on this, through coiling half circle coil on single frame, and half circle coil's tail head draws forth position and the beginning position of coil and be located the both sides of same single frame respectively for three-phase transformer can contain half circle structure's transformer coil, is favorable to the cost optimization and the technological innovation to three-phase transformer.

As shown in fig. 4, the embodiment of the present invention further provides a winding method of a transformer coil including a half turn structure, the winding method including, but not limited to, the following steps:

S1: the method comprises the steps of placing a three-dimensional wound iron core on winding equipment, wherein the three-dimensional wound iron core is formed by splicing three single frames, and the vertical frame edges of two adjacent single frames are fixedly connected together in an attaching mode to form a core column;

S2: mounting a winding die on the stem;

S3: fixing the start of the coil on a winding mold;

S4: winding an integer turn coil and a half turn coil, enabling the tail head of the half turn coil to pass through one single frame to form a closed loop, wherein the tail head leading-out position of the half turn coil and the starting head position of the coil are respectively positioned at two sides of the same single frame;

S5: and (4) finishing winding of the three single-frame corresponding coils according to the step S4.

In one embodiment, a three-dimensional wound iron core is placed on winding equipment, wherein the three-dimensional wound iron core is formed by splicing three single frames, and the vertical frame edges of two adjacent single frames are fixedly connected together in a fitting manner to form a core column; mounting a winding die on the stem; fixing the start of the coil on a winding mold; firstly winding an integer turn coil, and then winding the last half turn coil, so that the tail end of the half turn coil passes through one of the single frames to form a closed loop, and the tail end leading-out position of the half turn coil and the starting position of the coil are respectively positioned at two sides of the same single frame; and (5) finishing winding of the three single-frame corresponding coils according to the steps. Based on this, through coiling half circle coil on single frame, and half circle coil's tail head draws forth position and the beginning position of coil and be located the both sides of same single frame respectively for three-phase transformer can contain half circle structure's transformer coil, is favorable to the cost optimization and the technological innovation to three-phase transformer.

In one embodiment, a three-dimensional wound iron core is placed on winding equipment, wherein the three-dimensional wound iron core is formed by splicing three single frames, and the vertical frame edges of two adjacent single frames are fixedly connected together in a fitting manner to form a core column; mounting a winding die on the stem; fixing the start of the coil on a winding mold; firstly winding a half-turn coil, and then winding an integer-turn coil, so that the tail end of the half-turn coil passes through one of the single frames to form a closed loop, and the tail end leading-out position of the half-turn coil and the starting position of the coil are respectively positioned at two sides of the same single frame; and (5) finishing winding of the three single-frame corresponding coils according to the steps. Based on this, through coiling half circle coil on single frame, and half circle coil's tail head draws forth position and the beginning position of coil and be located the both sides of same single frame respectively for three-phase transformer can contain half circle structure's transformer coil, is favorable to the cost optimization and the technological innovation to three-phase transformer.

While the preferred embodiment of the present invention has been described in detail, the present invention is not limited to the above embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit and scope of the present invention, and these equivalent modifications or substitutions are included in the scope of the present invention as defined in the appended claims.

Claims (10)

1. A transformer coil comprising a half turn structure, comprising:

the three-dimensional wound iron core is formed by splicing three single frames, and the vertical frame edges of two adjacent single frames are fixedly connected together in an attaching mode to form a core column;

The coil is arranged on the three-dimensional coiled iron core, the coil comprises an integer-turn coil and a half-turn coil, the integer-turn coil and the half-turn coil are wound on the same core column, the tail end leading-out position of the half-turn coil and the starting position of the coil are respectively positioned on two sides of the same single frame, and the integer-turn coil and the half-turn coil form a closed loop.

2. The transformer coil comprising a half turn structure of claim 1, wherein the tail end lead-out position of the half turn coil is located inside the single frame and the start position of the coil is located outside the same single frame; or the tail end leading-out position of the half-turn coil is positioned at the outer side of the single frame, and the starting position of the coil is positioned at the inner side of the same single frame.

3. The transformer coil comprising a half turn structure of claim 1, wherein the transformer is a three-phase distribution transformer, and the three cores are single-frame-spliced into three core legs.

4. The transformer coil comprising a half turn structure of claim 1, wherein the coil comprises a high voltage coil and a low voltage coil, both of which are wound on the limb.

5. The transformer coil comprising a half turn structure of claim 4, wherein the high voltage coil and/or the low voltage coil comprises the half turn coil.

6. The transformer coil comprising a half turn structure of claim 1, wherein the three-phase half turn coil is wound on the limb.

7. The transformer coil comprising a half turn structure according to claim 1, wherein an insulator is provided between the coil and the solid wound core.

8. The transformer coil comprising a half turn structure according to claim 1, wherein the voltage calculation formula of the coil is as follows:

u=4.44 f (n+0.5) BS, where U is the voltage of the coil, f is the frequency, N is the number of turns of the closed loop with the cylinder, B is the magnetic flux density, and S is the cross-sectional area of the cylinder.

9. A transformer comprising a transformer coil comprising a half turn structure as claimed in any one of claims 1 to 8.

10. A method of winding a transformer coil comprising a half turn structure, comprising:

S1: placing a three-dimensional wound iron core on winding equipment, wherein the three-dimensional wound iron core is formed by splicing three single frames, and the vertical frame edges of two adjacent single frames are fixedly connected together in a fitting manner to form a core column;

s2: mounting a winding die on the core column;

S3: fixing the start of the coil on the winding mould;

S4: winding an integer turn coil and a half turn coil, enabling the tail head of the half turn coil to pass through one single frame to form a closed loop, wherein the tail head leading-out position of the half turn coil and the starting position of the coil are respectively positioned at two sides of the same single frame;

s5: and (4) finishing winding of the three coils corresponding to the single frame according to the step S4.