CN210925705U - Transformer and iron core thereof - Google Patents

Abstract

The utility model discloses a transformer and an iron core thereof, which relates to the technical field of transformers, wherein the iron core comprises three core columns formed by overlapping a plurality of column sheets side by side, two iron yokes which are in Y-shaped structures, the surface of each core column is in a ladder shape, the upper bottom edge of one column sheet in two adjacent column sheets is the same as the lower bottom edge of the other column sheet in length and is correspondingly connected with the other column sheet, and two side edges of each column sheet of the core column respectively form an upper port and a lower port of the core column; each edge of the two iron yokes is respectively formed by overlapping a plurality of bending yoke pieces side by side, each bending yoke piece is formed by bending a yoke piece with a step structure into an included angle of 120 degrees, the length of the upper bottom edge of one yoke piece in the two adjacent yoke pieces is the same as that of the lower bottom edge of the other yoke piece, the two side edges of each yoke piece are correspondingly connected, the two side edges of each yoke piece form a first port of each edge, and each first port of each iron yoke is correspondingly connected with the upper port and the lower port of each core column. By the arrangement, the iron core has no magnetic resistance and no material waste.

Description

Transformer and iron core thereof

Technical Field

The utility model relates to a transformer technical field, more specifically say, relate to a transformer and iron core thereof.

Background

The iron core of the transformer is a main magnetic circuit part in the transformer, the magnetic circuit of the iron core is very small, a strong induction magnetic field can be obtained through the iron core, and the iron core and a coil wound on the iron core form a complete electromagnetic induction system. The iron core comprises a core column sleeved with a coil and an iron yoke which does not sleeve the coil and only plays a role of a closed magnetic circuit, wherein the core column is formed by overlapping a plurality of column sheets, the iron yoke is formed by overlapping a plurality of yoke sheets so as to form a hollow iron core structure, the coil is provided with two or more than two windings, the winding connected with a power supply is a primary coil, and the rest windings are secondary coils.

The three-phase transformer is formed by three single-phase transformers, and the main flux of each phase must be closed by the magnetic circuits of the other two phases, so that the three-phase magnetic circuits are related to each other. However, the iron core of a general three-phase transformer is in a planar structure, as shown in fig. 1 of the accompanying drawings, 2 is an upper iron yoke, 3 is a lower iron yoke, and 1 is any one of three legs, which also represents a magnetic circuit of each phase, the lengths of the magnetic circuits of three phases are different, the magnetic circuit of one phase in the middle is short, and the magnetic circuits of the other two phases are long, resulting in a slight difference in the magnetic resistance of the three phases. When three-phase symmetrical voltage is applied externally, three-phase no-load current is unequal, the lengths of magnetic circuits are different, the directions of the magnetic circuits are different, the current of one phase in the middle is small, and the current of the other two phases is large, so that the load operation of the transformer is influenced, and a part of loss is caused.

In the prior art, the iron core of the planar structure of the three-phase transformer is formed by splicing raw material column sheets and yoke sheets, and then a core column formed by the column sheets is spliced with an iron yoke formed by the yoke sheets. However, the existing raw material column piece and yoke piece have many types with different lengths, but both ends of the raw material are inclined, and the whole body is trapezoidal, so both ends of the core column 3 made of the raw material column piece are also inclined, so that both ends of the core column 3 made of the raw material column piece need to be cut off, as shown in fig. 2, namely, redundant first parts 7 and second parts 8 at both ends of the core column 1 are cut off, so that the upper end and the lower end of the core column 1 of the middle phase of the iron core of the three-phase transformer are both triangular, and meanwhile, triangular grooves need to be formed in the middle positions of the upper iron yoke 2 and the lower iron yoke 3, as shown in fig. 3, a part also needs to be cut off, namely, a third part 9 in the middle of the upper iron yoke 2 and the lower iron yoke 3 is cut off, so that the upper end and the lower end of the core column 1 of the middle phase can be respectively inserted into the triangular grooves of the upper iron yoke 2 and the lower iron yoke 3, thereby realizing the purpose. The whole body can cause the waste of raw materials, and can not be utilized completely. According to the actual production process, the manufactured iron core only utilizes about 90% of raw materials, and the rest raw materials are only wasted.

Therefore, how to solve the problems of inconsistent magnetic path direction, large magnetic resistance and waste of raw materials for manufacturing the iron core of the three-phase transformer in the prior art becomes an important technical problem to be solved by technical personnel in the field.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a transformer and iron core thereof are big, cause the technical problem of the waste of the raw and other materials of preparation iron core with the magnetic resistance that solves among the prior art three-phase transformer's iron core existence. The utility model provides a plurality of technical effects that preferred technical scheme among a great deal of technical scheme can produce see the explanation below in detail.

The utility model provides an iron core of transformer, include:

the core column comprises three core columns and a plurality of core columns, wherein the core columns are used for winding coils, each core column is formed by overlapping a plurality of column sheets side by side so that the surface of each core column is in a step shape, each column sheet is in a first trapezoidal structure, the first trapezoidal structure comprises a first upper bottom edge, a first lower bottom edge and two first side edges which are parallel to each other, the first upper bottom edge of one column sheet is as long as and correspondingly connected with the first lower bottom edge of the other column sheet in any two adjacent column sheets, and the two first side edges of each column sheet of the core column respectively form an upper port and a lower port of the core column;

the upper iron yoke and the lower iron yoke are respectively arranged at the upper end and the lower end of each core column, the upper iron yoke and the lower iron yoke are both in a Y-shaped structure, each side of the Y-shaped structure is respectively formed by overlapping a plurality of bent yoke pieces side by side, each bent yoke piece is formed by bending a yoke piece in a second trapezoidal structure to form an included angle of 120 degrees, the bent part of each bent yoke piece forms the center of the Y-shaped structure, the second trapezoidal structure comprises a second upper bottom edge, a second lower bottom edge and two second side edges which are parallel to each other, any two adjacent yoke pieces are arranged in any two yoke pieces, the second upper bottom edge of one yoke piece is the same as and correspondingly connected with the second lower bottom edge of the other yoke piece in length, and the two second side edges of each yoke piece form first ports of each side of the Y-shaped structure, and each of the first ports of the upper iron yoke and each of the first ports of the lower iron yoke are respectively connected with the upper port and the lower port of each of the stems correspondingly.

Preferably, the number of the yoke pieces on each side of the Y-shaped structure is the same as the number of the corresponding connected pillar pieces on the stem, and the yoke pieces and the corresponding pillar pieces have the same thickness.

Preferably, the stem has a central axis surface, the column pieces located at two sides of the central axis surface and the yoke pieces located at two sides of the central axis surface are respectively symmetrical with respect to the central axis surface, and the column pieces and the yoke pieces located at the same side of the central axis surface are connected in a one-to-one correspondence.

Preferably, along a direction close to the central axis plane, the widths of the column pieces of the stem located on the same side of the central axis plane and the yoke pieces of the Y-shaped structure located on the same side of the central axis plane are gradually decreased and the heights of the column pieces and the yoke pieces are gradually increased.

Preferably, each of the first ports of the upper iron yoke and the first ports of the lower iron yoke are identical to the upper ports and the lower ports of the core legs, which are correspondingly connected, in structure and size.

Preferably, projections of the upper port and the lower port of the same stem on the central axis plane are respectively a first straight line and a second straight line, included angles between the first straight line and the horizontal plane and included angles between the second straight line and the horizontal plane are respectively a and b, and the included angles a and b are 30-60 degrees.

Preferably, the three sides of the Y-shaped structure have the same structure and size.

Preferably, the structure and size of each stem are the same, and the structure and size of the upper iron yoke are the same as those of the lower iron yoke.

Preferably, each of the column plates and each of the yoke plates are silicon steel plates.

The utility model also provides a transformer, the iron core of transformer in the above-mentioned embodiment.

The utility model provides an among the technical scheme, the iron core of transformer includes three stem, go up indisputable yoke and indisputable yoke down, three stem is used for the winding coil, each stem comprises a plurality of column pieces coincide side by side, so that the surface of each stem all is the echelonment, each column piece all is first trapezium structure, first trapezium structure includes the first upper base that is parallel to each other, first bottom edge and two first sides, in arbitrary two adjacent column pieces, the length of the first upper base of one of them column piece is the same with the first bottom edge of another column piece and corresponds the connection, two first sides of each column piece of stem constitute the upper port and the lower port of this stem respectively; the upper iron yoke and the lower iron yoke are respectively arranged at the upper end and the lower end of each core column, the upper iron yoke and the lower iron yoke are both in a Y-shaped structure, each side of the Y-shaped structure is respectively formed by overlapping a plurality of bent yoke pieces side by side, each bent yoke piece is formed by bending a yoke piece in a second trapezoidal structure into an included angle of 120 degrees, the bent part of each bent yoke piece forms the center of the Y-shaped structure, the second trapezoidal structure comprises a second upper bottom edge, a second lower bottom edge and two second side edges which are parallel to each other, in any two adjacent yoke pieces, the second upper bottom edge of one yoke piece is as long as the second lower bottom edge of the other yoke piece and is correspondingly connected with the second upper bottom edge of the other yoke piece, the two second side edges of each yoke piece form first ports of each side of the Y-shaped structure, and each first port of each upper iron yoke and each first port of each lower iron yoke are respectively connected with the upper port of each core column, The lower ports are correspondingly connected. By the arrangement, the lengths of the three-phase magnetic circuits of the iron core are equal, the directions of the three-phase magnetic circuits of the iron core are consistent, the three-phase magnetic resistances are almost equal, and finally, the load operation of the transformer is almost not influenced; the iron core has light weight, small processing coefficient and zero-sequence loss. When the core column and the upper iron yoke or the lower iron yoke of the iron core are manufactured, the column piece and the yoke piece with proper lengths are directly selected and used for connection, and the upper iron yoke, the lower iron yoke and the core column of the middle phase which are formed do not need to be partially cut like a three-phase iron core with a planar structure in the prior art, so that the iron core can not cause waste of raw materials for manufacturing the iron core, namely the column piece and the yoke piece can not be wasted, and the materials can be utilized in hundreds of percent.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural view of a three-phase iron core in the prior art;

FIG. 2 is a diagram illustrating a structure of a middle core leg of a three-phase iron core in the prior art;

fig. 3 is a view illustrating a structure of an upper yoke of a three-phase iron core according to the prior art;

fig. 4 is a schematic structural diagram of an iron core of a transformer in an embodiment of the present invention;

fig. 5 is a front view of an iron core of a transformer in an embodiment of the present invention;

fig. 6 is a side view of a core of a transformer in an embodiment of the invention;

fig. 7 is a plan view of an iron core of a transformer in an embodiment of the present invention;

FIG. 8 is a schematic structural view of a stem according to an embodiment of the present invention;

fig. 9 is a schematic structural view of an upper yoke according to an embodiment of the present invention;

FIG. 10 is a schematic structural view of a pillar piece according to an embodiment of the present invention;

fig. 11 is a schematic structural view of a yoke plate according to an embodiment of the present invention.

In FIGS. 1-11:

1-stem, 101-upper port, 102-lower port, 2-upper yoke, 201-first port, 3-lower yoke, 4-column piece, 401-first upper bottom edge, 402-first lower bottom edge, 403-first side edge, 5-yoke piece, 501-second upper bottom edge, 502-second lower bottom edge, 503-second side edge, 6-coil, 7-first portion, 8-second portion, and 9-third portion.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

An object of this embodiment is to provide a transformer and an iron core thereof, which solve the problems of the prior art that the magnetic resistance of the iron core of a three-phase transformer is large and the waste of raw materials for manufacturing the iron core is caused.

Hereinafter, embodiments will be described with reference to the drawings. The embodiments described below do not limit the scope of the invention described in the claims. Further, the entire contents of the configurations shown in the following embodiments are not limited to those necessary as a solution of the invention described in the claims.

Referring to fig. 4-7, fig. 5-7 are three views of the iron core of the transformer. In the present embodiment, the iron core of the transformer includes three limbs 1, an upper iron yoke 2, and a lower iron yoke 3. Wherein three stem 1 all is used for winding coil 6, and each stem 1 is set up and coincide by a plurality of column pieces 4 side by side and constitutes, realizes connecting through anchor clamps between each column piece 4, and the surface that makes the stem 1 who constitutes finally is the echelonment. The pillar pieces 4 are raw materials for forming the stem 1, each pillar piece 4 itself is a first trapezoid structure, as shown in fig. 10, the first trapezoid structure includes a first upper bottom edge 401, a first lower bottom edge 402, and two first side edges 403, which are parallel to each other, wherein the first upper bottom edge 401 is parallel to the first lower bottom plate, and the direction of the first upper bottom edge 401 and the first lower bottom plate is the length direction of the pillar piece 4. In any two adjacent column pieces 4, the first upper bottom edge 401 of one column piece 4 and the first lower bottom edge 402 of the other column piece 4 have the same length and are correspondingly connected, as shown in fig. 10, the left and right sides of the two column pieces 4 in the figure are respectively the first upper bottom edge 401 and the first lower bottom edge 402 of the first trapezoidal structure, the upper and lower sides are two first side edges 403, the second lower bottom edge 502 of the yoke piece 5 on the left side is correspondingly connected with the second upper bottom edge 501 of the yoke piece 5 on the right side, all the column pieces 4 are connected in this way, and finally, the two first side edges 403 of each column piece 4 are exposed to form the upper port 101 and the lower port 102 of the core column 1.

The upper iron yoke 2 and the lower iron yoke 3 are respectively arranged at the upper end and the lower end of each stem 1, the upper iron yoke 2 and the lower iron yoke 3 are both in a Y-shaped structure, each side of the Y-shaped structure is respectively formed by overlapping a plurality of bent yoke pieces side by side, each bent yoke piece is formed by bending a yoke piece 5 in a second trapezoid structure to form an included angle of 120 degrees, the bent part of each bent yoke piece forms the center of the Y-shaped structure, the second trapezoid structure comprises a second upper bottom edge 501, a second lower bottom edge 502 and two second side edges 503 which are parallel to each other, and in any two adjacent yoke pieces 5, the second upper bottom edge 501 of one yoke piece 5 is the same as and correspondingly connected with the second lower bottom edge 502 of the other yoke piece 5 in length. Specifically, as shown in fig. 11, the upper and lower sides of two yoke pieces 5 in the figure are respectively a second upper bottom edge 501 and a second lower bottom edge 502, the left and right sides are respectively a second side edge 503, the second lower bottom edge 502 of the upper yoke piece 5 is correspondingly connected with the second upper bottom edge 501 of the lower yoke piece 5, each yoke piece 5 is connected in this way, finally, the two second side edges 503 of each yoke piece 5 are exposed to form the first ports 201 of the sides of the "Y" type structure, and each first port 201 of the upper yoke 2 and each first port 201 of the lower yoke 3 are correspondingly connected with the upper port 101 and the lower port 102 of each stem 1, respectively, thereby forming the whole core.

According to the arrangement, the three-phase magnetic circuits of the iron core are equal in length, the three-phase magnetic circuits of the iron core are consistent in direction, the three-phase magnetic resistances are almost equal, and finally, the load operation of the transformer is basically not influenced; the iron core has light weight, small processing coefficient and zero-sequence loss. When the stem 1 and the upper yoke 2 or the lower yoke 3 of the iron core are manufactured, the stem 4 and the yoke 5 with proper lengths are directly selected and used for connection, and the upper yoke 2, the lower yoke 3 and the stem 1 of the middle phase which are formed need to be partially cut off like a three-phase iron core with a planar structure in the prior art, so that the iron core can not cause waste of raw materials for manufacturing the iron core, namely the stem 4 and the yoke 5 can not be wasted, and the materials can be utilized in hundreds of percent.

As an alternative embodiment, as shown in fig. 7, the number of yoke pieces 5 on each side of the "Y" shaped structure is the same as the number of column pieces 4 on the stem 1 connected correspondingly, the yoke pieces 5 are connected with the column pieces 4 in one-to-one correspondence, and the thickness of each yoke piece 5 is the same as that of the corresponding column piece 4.

With this arrangement, any one of the yoke pieces 5 has the corresponding column piece 4 connected thereto, and when the yoke piece 5 of the upper or lower yoke 2 or 3 has magnetic flux passing therethrough, the magnetic flux thereon can flow more smoothly to the corresponding column piece 4.

As an alternative embodiment, the stem 1 has a central axis surface, the column pieces 4 located on both sides of the central axis surface and the yoke pieces 5 located on both sides of the central axis surface are respectively symmetrical with respect to the central axis surface, and the column pieces 4 and the yoke pieces 5 located on the same side of the central axis surface are connected in a one-to-one correspondence. Preferably, each stem 1 has a central axis plane, the central axis plane of each stem 1 is different, but the column sheet 4 and the yoke sheet 5 on both sides of the central axis plane of any one stem 1 are respectively symmetrical about the central axis plane.

So set up, three-phase magnetic circuit is symmetrical for induced voltage and induced current that produce can be more steady.

As an alternative embodiment, the widths of the respective pole pieces 4 of the stem 1 on the same side of the medial axis plane decrease sequentially, and the heights of the respective yoke pieces 5 of the "Y" type structure on the same side of the medial axis plane also decrease sequentially, and the heights of the respective yoke pieces increase sequentially.

Because the winding coil 6 is circular, so set up, the three-phase magnetic circuit that presents this trend just can be circular, becomes to be suitable for the structure that coil 6 twined.

In an alternative embodiment, the upper port 101 of the stem 1 is the same size and configuration as the first port 201 of the upper yoke 2, and the lower port 102 of the stem 1 is the same size and configuration as the first port 201 of the lower yoke 3. Preferably, as shown in fig. 8 and 9, the upper port 101 and the lower port 102 of the stem 1 each have an irregular semi-elliptical profile, i.e., the first side edge 403 of each leg 4 of the stem 1 has the same angle with the horizontal plane, and likewise, the second side edge 503 of each yoke piece 5 of the upper yoke 2 or the lower yoke 3 has the same angle with the horizontal plane.

With the arrangement, the upper port 101 of the stem 1 is just matched and connected with the first port 201 of the upper iron yoke 2, so that the column pieces 4 and the yoke pieces 5 on the stem 1 are directly in one-to-one correspondence. If the inclination angles of the first side edges 403 of the respective leg pieces 4 on the same stem 1 are different, the first port 201 of the upper yoke 2 is connected to the upper port 101 of the stem 1 in a one-to-one correspondence, which is complicated and complicated, and thus the arrangement further simplifies and facilitates the connection process.

In a preferred embodiment, the projections of the upper port 101 and the lower port 102 of the same stem 1 on the medial axis plane are a first straight line and a second straight line respectively, the included angles between the first straight line and the horizontal plane and the included angles between the second straight line and the horizontal plane are a and b respectively, as shown in fig. 6, and the included angles a and b are 30-60 degrees. Preferably, the included angle a and the included angle b are both 45 degrees.

In an alternative embodiment, the three sides of the "Y" shape are all the same in structure and size, that is, the three sides of the upper iron yoke 2 are the same in structure and size, and the three sides of the lower iron yoke 3 are the same in structure and size. Preferably, the structure and size of each stem 1 are the same, and the structure and size of the upper iron yoke 2 and the lower iron yoke 3 are the same.

With the arrangement, the whole iron core is arranged to be of a symmetrical structure, magnetic circuits of all phases are completely the same, the core legs 1 can be interchanged, the upper iron yoke 2 and the lower iron yoke 3 can also be interchanged, and neither is a fixed installation position. For manufacturing the iron core, only one specification of iron yoke and one specification of core column 1 are needed, two iron yokes of the same specification are manufactured, three core columns 1 of the same specification are manufactured, the iron core manufacturing process is simple, installation is convenient, and magnetic resistance cannot be generated.

As an alternative embodiment, each column sheet 4 and each yoke sheet 5 are silicon steel sheets.

The magnetic permeability of silicon steel sheet is higher, and the resistance of silicon steel sheet is big moreover, and insulating each other between each sheet silicon steel sheet can increase the degree of difficulty that the electric current passes through, makes the vortex reduce to reduce the heat effect. So set up, can increase the resistance in the iron core, reduce the vortex in the iron core, improve the efficiency of transformer.

The iron core of the transformer is specifically described with reference to the above embodiments, in this embodiment, the iron core of the transformer includes three core legs 1, an upper iron yoke 2 and a lower iron yoke 3, the core legs 1 have the same structure and size, and are each formed by stacking a plurality of column pieces 4 side by side, so that the surface of each core leg 1 is stepped, each column piece 4 has a first trapezoidal structure, the first trapezoidal structure includes a first upper bottom edge 401, a first lower bottom edge 402 and two first side edges 403, which are parallel to each other, in any two adjacent column pieces 4, the first upper bottom edge 401 of one column piece 4 is the same as and correspondingly connected to the first lower bottom edge 402 of another column piece 4, the two first side edges 403 of each column piece 4 of the core leg 1 respectively form an upper end opening 101 and a lower end opening 102 of the core leg 1, the projections of the upper end opening 101 and the lower end opening 102 of the same core leg 1 on the central axis plane are respectively a first straight line and a second straight line, the included angles between the first straight line and the horizontal plane and between the second straight line and the horizontal plane are respectively a and b, and the included angles a and b are 30-60 degrees. The upper iron yoke 2 and the lower iron yoke 3 have the same structure and size and are respectively arranged at the upper end and the lower end of each stem 1, the upper iron yoke 2 and the lower iron yoke 3 are both in a Y-shaped structure, the structure and size of three sides of the Y-shaped structure are the same, each side of the Y-shaped structure is respectively formed by overlapping a plurality of bending yoke sheets 5 side by side, each bending yoke sheet 5 is formed by bending a yoke sheet 5 in a second trapezoid structure into an included angle of 120 degrees, the bending part of each bending yoke sheet 5 forms the center of the Y-shaped structure, the second trapezoid structure comprises a second upper bottom edge 501, a second lower bottom edge 502 and two second side edges 503 which are parallel to each other, in any two adjacent yoke sheets 5, the length of the second upper bottom edge 501 of one yoke sheet 5 is the same as that of the second lower bottom edge 502 of the other yoke sheet 5 and the second side edges 503 of each yoke sheet 5 are correspondingly connected, and the two second side edges 503 of each yoke sheets 5 form a first port 201 of each side edge of the Y-shaped structure, and each first port 201 of the upper iron yoke 2 and each first port 201 of the lower iron yoke 3 are respectively connected with the upper port 101 and the lower port 102 of each stem 1 in the same structure and size and correspondingly. The number of the yoke sheets 5 on each side of the Y-shaped structure is the same as that of the column sheets 4 on the stem 1 correspondingly connected, and the yoke sheets 5 are in one-to-one correspondence with the corresponding column sheets 4 in thickness. The core column 1 is provided with a middle shaft surface, column sheets 4 positioned at two sides of the middle shaft surface and yoke sheets 5 positioned at two sides of the middle shaft surface are respectively symmetrical relative to the middle shaft surface, and the column sheets 4 positioned at the same side of the middle shaft surface are correspondingly connected with the yoke sheets 5 one by one; the width of each column piece 4 of the core column 1 positioned on the same side of the middle axis surface and the width of each yoke piece 5 of the Y-shaped structure positioned on the same side of the middle axis surface are sequentially decreased and the height is sequentially increased.

By the arrangement, the three-phase magnetic circuits of the iron core are equal in length, the three-phase magnetic resistances are equal, and finally, no influence is caused on the load operation of the transformer; when the core column and the upper iron yoke or the lower iron yoke of the iron core are manufactured, the column sheet and the yoke sheet with proper lengths are directly selected for connection, so that the column sheet and the yoke sheet are not wasted, and hundreds of materials are utilized.

The utility model also provides a transformer, including iron core and coil 6, the iron core is the iron core of foretell transformer. So set up, the three-phase magnetic resistance of this transformer's iron core equals, does not have the influence to the load operation of transformer, and can not waste column piece 4 and yoke piece 5, makes the material hundred obtain the utilization.

It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments. The utility model provides a plurality of schemes contain the basic scheme of itself, mutual independence to restrict each other, but it also can combine each other under the condition of not conflicting, reaches a plurality of effects and realizes jointly.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. A core for a transformer, comprising:

the three core columns (1) are used for winding coils (6), each core column (1) is formed by overlapping a plurality of column sheets (4) side by side so that the surface of each core column (1) is in a step shape, each column sheet (4) is in a first trapezoid structure, each first trapezoid structure comprises a first upper bottom edge (401), a first lower bottom edge (402) and two first side edges (403) which are parallel to each other, in any two adjacent column sheets (4), the first upper bottom edge (401) of one column sheet (4) is as long as and correspondingly connected with the first lower bottom edge (402) of the other column sheet (4), and the two first side edges (403) of each column sheet (4) of each core column (1) respectively form an upper end opening (101) and a lower end opening (102) of the core column (1);

the upper iron yoke (2) and the lower iron yoke (3) are respectively arranged at the upper end and the lower end of each stem (1), the upper iron yoke (2) and the lower iron yoke (3) are both in a Y-shaped structure, each side of the Y-shaped structure is respectively formed by overlapping a plurality of bending yoke sheets (5) side by side, each bending yoke sheet (5) is formed by bending a yoke sheet (5) in a second trapezoidal structure into an included angle of 120 degrees, the bending part of each bending yoke sheet (5) forms the center of the Y-shaped structure, the second trapezoidal structure comprises a second upper bottom edge (501), a second lower bottom edge (502) and two second side edges (503) which are parallel to each other, and in any two adjacent yoke sheets (5), the second upper bottom edge (501) of one yoke sheet (5) is as long as the second lower bottom edge (502) of the other yoke sheet (5) and is correspondingly connected with the second upper bottom edge (501) of the other yoke sheet (5), the two second sides (503) of each yoke piece (5) form first ports (201) of each side of the Y-shaped structure, and each first port (201) of the upper yoke (2) and each first port (201) of the lower yoke (3) are respectively connected with the upper port (101) and the lower port (102) of each stem (1) correspondingly.

2. The transformer core according to claim 1, wherein the number of the yoke pieces (5) on each side of the "Y" shaped structure is the same as the number of the corresponding connected leg pieces (4) on the core leg (1) and corresponds to one another, and the thickness of the yoke pieces (5) is the same as the thickness of the corresponding leg pieces (4).

3. The transformer core according to claim 2, wherein the core leg (1) has a central axial plane, the leg pieces (4) on both sides of the central axial plane and the yoke pieces (5) on both sides of the central axial plane are respectively symmetrical with respect to the central axial plane, and the leg pieces (4) and the yoke pieces (5) on the same side of the central axial plane are connected in a one-to-one correspondence.

4. A transformer core according to claim 3, characterized in that in the direction close to the neutral axis plane, the width of each of said legs (4) of said leg (1) on the same side of said neutral axis plane and the height of each of said yoke segments (5) of said "Y" configuration on the same side of said neutral axis plane decrease successively and increase successively.

5. The transformer core according to claim 3, wherein each of the first ports (201) of the upper yoke (2) and each of the first ports (201) of the lower yoke (3) are identical in structure and size to the corresponding upper port (101) and the corresponding lower port (102) of the core leg (1).

6. The transformer core according to claim 5, wherein the projections of the upper port (101) and the lower port (102) of the same leg (1) on the central axis plane are respectively a first straight line and a second straight line, the included angles between the first straight line and the horizontal plane and the included angles a and b are respectively a and b, and the included angles a and b are 30-60 degrees.

7. The transformer core according to claim 3, wherein the three sides of the "Y" shaped structure are identical in structure and size.

8. The transformer core according to claim 1, wherein each of the legs (1) has the same structure and size, and the upper yoke (2) and the lower yoke (3) have the same structure and size.

9. The transformer core according to claim 1, wherein each of the column sheets (4) and each of the yoke sheets (5) is a silicon steel sheet.

10. A transformer, characterized by comprising a transformer core and a coil (6), the transformer core being a transformer core according to any one of claims 1-9.

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