CN115497717A - Three-phase three-column planar iron core, manufacturing method thereof and transformer - Google Patents

Abstract

The invention relates to a three-phase three-column planar iron core, a manufacturing method thereof and a transformer. The three-phase three-column planar iron core comprises two first single-frame iron cores, wherein a first core column and a second core column are respectively arranged on two sides of each single-frame iron core along a first direction, the two first single-frame iron cores are arranged side by side along the first direction, and the two first core columns of the two first single-frame iron cores are butted to form a first iron core column; the two third core columns are respectively butted with the second core columns of the two first single-frame iron cores to form two second core column columns; wherein each of the first single-frame cores includes a plurality of first core biscuits stacked in a second direction intersecting the first direction, each of the first core biscuits being formed by winding the first strip material around the second direction.

Description

Three-phase three-column planar iron core, manufacturing method thereof and transformer

Technical Field

The invention relates to the technical field of transformers, in particular to a three-phase three-column planar iron core, a manufacturing method thereof and a transformer.

Background

The transformer is basic equipment for power transmission and distribution, and is widely applied to the fields of industry, agriculture, traffic, urban communities and the like. A Transformer (Transformer) is a device for changing an ac voltage by using the principle of electromagnetic induction, and has main components of a coil and an iron core (magnetic core), and has the main functions of: voltage transformation, current transformation, impedance transformation, isolation, voltage stabilization (magnetic saturation transformer), and the like.

The iron core is an important part in the transformer, and the conventional iron core is generally manufactured by laminating silicon steel sheets, but is limited by the size of the silicon steel sheets, so that the iron core of the transformer with a large size is difficult to manufacture, and further the large transformer is difficult to manufacture.

Disclosure of Invention

Accordingly, there is a need to provide a three-phase three-column planar iron core, a method for manufacturing the same, and a transformer, which overcome the above-mentioned drawbacks, in order to solve the problem that it is difficult to manufacture a large-sized iron core.

A three-phase three-limb planar core comprising:

the two single-frame iron cores are arranged side by side along the first direction, and the two first core columns of the two single-frame iron cores are in butt joint to form a first iron core column; and

the second single-frame iron core is provided with third core columns on two sides along the first direction and sleeved on the peripheries of the two first single-frame iron cores, and the two third core columns are respectively in butt joint with the second core columns of the two first single-frame iron cores to form two second core columns;

wherein each of the first single-frame cores includes a plurality of first core biscuits stacked in a second direction intersecting the first direction, each of the first core biscuits being formed by a first strip material wound around the second direction.

In one embodiment, each first iron core cake has a first through hole penetrating along the second direction, the first through holes of the first iron core cakes in each first single-frame iron core are coaxially arranged and communicated to form a first window, and the parts, located at two sides of the first window in the first direction, of each first single-frame iron core are respectively a first core column and a second core column;

the outer diameters of a plurality of first iron core cakes of each first single-frame iron core in the first direction are equal, so that a first flat surface is formed on one side, away from the first window, of the first core column and the second core column; the inner diameters of the first iron core cakes of each first single-frame iron core in the first direction are gradually changed, so that a first stepped inner wall is formed on one side, facing the first window, of the first core column and one side, facing the second window, of the second core column.

In one embodiment, the inner diameter of each first iron core cake of each first single-frame iron core in the first direction gradually decreases and then gradually increases along the second direction, so that the first stepped inner wall is in an arc shape protruding outwards towards the first window.

In one embodiment, the second single frame core includes a plurality of second core biscuits stacked in the second direction, each of the second core biscuits formed by winding a second strip material around the second direction.

In one embodiment, each second iron core cake has a second through hole penetrating along the second direction, the second through holes on the second iron core cakes are coaxially arranged and communicated to form a second window, and the parts of the second single-frame iron core, which are located on the two sides of the second window in the first direction, are two third mandrels respectively;

a plurality of said second mandrel cakes having equal inside diameters in said first direction to form a second flat face on a side of said third mandrel facing said second window; the outer diameters of the second iron core cakes in the first direction are gradually changed, so that a first stepped outer wall is formed on one side, away from the second window, of the third core column.

In one embodiment, the outer diameters of the second iron core cakes in the first direction are gradually increased and then gradually decreased along the second direction, so that the first stepped outer wall is in an arc shape protruding outwards away from the second window.

In one embodiment, the second single-frame iron core has a second window penetrating along the second direction, the two first single-frame iron cores are accommodated in the second window, and the two third core pillars are respectively arranged at two sides of the second window in the first direction;

the second single-frame iron core is formed by winding a third strip around the second window, the bandwidth of the third strip is gradually reduced, so that a second whole surface is formed on one side, facing the second window, of each third core column, a first stepped outer wall is formed on one side, facing away from the second window, of each third core column, and the first stepped outer wall is in an arc shape facing away from the second window and protruding outwards.

In one embodiment, the three-phase three-column planar iron core further comprises a first insulating member, and the first insulating member is arranged between the two first single-frame iron cores;

the three-phase three-column planar iron core further comprises a second insulating piece, and the second insulating piece is arranged between each first single-frame iron core and each second single-frame iron core;

the three-phase three-column planar iron core further comprises a third insulating part, and the third insulating part is arranged in a gap formed between the two first single-frame iron cores and the second single-frame iron cores.

A method for manufacturing a three-phase three-column planar iron core as described in any one of the above embodiments, comprising the steps of:

winding a first strip material to form a first iron core cake;

stacking a plurality of the first iron core cakes to form a first single-frame iron core;

and arranging the two first single-frame iron cores in parallel in a second single-frame iron core.

In one embodiment, the step of arranging two first single-frame cores side by side in a second single-frame core further comprises the steps of:

winding a second strip material to form a second iron core cake;

and stacking a plurality of the second iron core cakes to form a second single-frame iron core.

In one embodiment, the step of disposing the two first single-frame cores side by side in the second single-frame core further comprises the steps of:

and winding a third strip material to form a second single-frame iron core, wherein the bandwidth of the third strip material is gradually reduced.

A transformer comprising a three-phase three-limb planar core as described in any one of the embodiments above.

According to the three-phase three-column planar iron core, the manufacturing method thereof and the transformer, the first single-frame iron core is formed by stacking the first iron core cakes along the second direction, each first iron core cake is formed by winding the first strip material around the second direction, and the radial size of each first iron core cake is in direct proportion to the number of turns of the first strip material. When the iron core of the large transformer needs to be manufactured, the radial size of the first iron core cake can be increased only by increasing the number of winding turns of the first strip, and then the large transformer can be manufactured conveniently.

Drawings

Fig. 1 is a schematic structural diagram of a three-phase three-column planar iron core according to an embodiment of the present invention;

fig. 2 isbase:Sub>A sectional view of the three-phase three-limb planar core shown in fig. 1 taken alongbase:Sub>A directionbase:Sub>A-base:Sub>A;

fig. 3 is a sectional view of the three-phase three-limb planar core shown in fig. 1 taken along the direction B-B;

fig. 4 is a schematic structural view of two first single-frame cores of the three-phase three-column planar core shown in fig. 1;

fig. 5 is a cross-sectional view of two first single-frame cores shown in fig. 4 in the C-C direction;

fig. 6 is a sectional view of two first single frame cores shown in fig. 4 in a direction D-D;

fig. 7 is a schematic view of a first core cake of the first single frame core shown in fig. 4;

FIG. 8 is a schematic view of the structure of a first annular core cake;

fig. 9 is a schematic structural view of a second single-frame iron core of the three-phase three-column planar iron core shown in fig. 1;

fig. 10 is a sectional view of the second single frame core shown in fig. 9 taken along the G-G direction;

fig. 11 is a sectional view of the second single frame core shown in fig. 9 taken along the direction H-H;

fig. 12 is a schematic view of a second core cake of the second single frame core shown in fig. 9;

fig. 13 is a flowchart of a method for manufacturing a three-phase three-column planar core according to an embodiment of the present invention;

fig. 14 is a detailed step of step S10 shown in fig. 13;

fig. 15 is a step further included before step S30 shown in fig. 13;

fig. 16 shows a specific step of step S31 shown in fig. 15.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless explicitly specified otherwise.

In the present invention, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being permanently connected, detachably connected, or integral; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

In the present invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the second feature or the first and second features may be indirectly contacting each other through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Referring to fig. 1, 2 and 3, an embodiment of the present invention provides a three-phase three-column planar core, which includes two first single-frame cores 10 and two second single-frame cores 20.

Each of the first single-frame cores 10 has a first stem 11 and a second stem 12 on both sides in the first direction, respectively. The two first single-frame iron cores 10 are arranged side by side along a first direction, and the two first core legs 11 of the two first single-frame iron cores 10 are butted to form a first core leg 110 for installing a coil. Both sides of the second single-frame core 20 in the first direction have third stems 21. The second single-frame iron core 20 is sleeved on the peripheries of the two first single-frame iron cores 10, and the two third core legs 21 are respectively butted with the second core legs 12 of the two first single-frame iron cores 10 to form two second core legs 211 for installing coils.

Wherein each of the first single-frame cores 10 includes a plurality of first core cakes 15 stacked in a second direction intersecting the first direction, each of the first core cakes 15 being formed by winding a first strip material 151 (see fig. 7) around the second direction. Optionally, the first direction is perpendicular to the second direction. Specifically, in the embodiment shown in fig. 1, the first direction is a left-right direction, and the second direction is a direction perpendicular to the paper.

In the three-phase three-column planar iron core, the first single-frame iron core 10 is formed by stacking the first iron core cakes 15 along the second direction, each first iron core cake 15 is formed by winding the first strip 151 around the second direction, and the radial dimension of each first iron core cake 15 is proportional to the number of turns of the first strip 151. When the iron core of the large transformer needs to be manufactured, the radial size of the first iron core cake 15 can be increased only by increasing the number of winding turns of the first strip 151, and then the large transformer can be conveniently manufactured.

Referring to fig. 4, 5 and 6, in the embodiment of the present invention, each first iron core cake 15 has a first through hole 152 (see fig. 7) penetrating along the second direction, and the first through holes 152 of the first iron core cakes 15 in each first single-frame iron core 10 are coaxially disposed and communicated to form the first window 13. The portions of each first single-frame core 10 located on both sides of the first window 13 in the first direction are a first core post 11 and a second core post 12, respectively. The plurality of first core cakes 15 of each first single-frame core 10 have the same outer diameter in the first direction to form a first flat surface 122 on the side of the first and second stems 11 and 12 facing away from the first window 13. So, because the outside of the first stem 11 of two first single frame iron cores 10 and the second stem 12 is first plane of flatness 122, be favorable to the laminating of the first plane of flatness 122 of two first stems 11 of two first single frame iron cores 10 to form a first iron core post 110, and be favorable to the laminating of the first plane of flatness 122 of two second stems 12 respectively with two third stems 21 of second single frame iron core 20 to form two second iron core posts 211, thereby reduced the concatenation degree of difficulty, promoted the concatenation quality.

Specifically, in the embodiment, the inner diameters of the plurality of first core biscuits 15 of each first single-frame core 10 are gradually increased in the first direction to form the first stepped inner wall 121 on the side of the first core leg 11 and the second core leg 12 facing the first window 13. So, can make the inboard first ladder-shaped inner wall 121 of first stem 11 and second stem 12 form the arcwall face, two first single frame iron cores 10 and the butt joint back of second single frame iron core 20, two arcwall faces butt joint of two first stems 11 of two first single frame iron cores 10 form the periphery and are approximately circular or oval-shaped first iron core post 110, the arcwall face of second stem 12 of first single frame iron core 10 and the butt joint in the outside of third stem 21 of second single frame iron core 20 form the periphery and be approximately circular or oval-shaped second iron core post 211, make the coil around having the winding of radian iron core post, the coil is inside can not form too big winding stress, improve coil life, and conveniently wind the iron core with high efficiency.

Further, the inner diameter of each first core cake 15 of each first single-frame core 10 in the first direction gradually decreases and then gradually increases along the second direction, so that the first stepped inner wall 121 is in an arc shape protruding outward toward the first window 13, thereby conveniently making the first stepped inner walls 121 inside the first core column 11 and the second core column 12 become an approximate semi-circular arc surface or a semi-elliptical surface, and further making the outer peripheries of the first core column 110 and the second core column 211 similar to a circle or an ellipse.

In particular, in the embodiment shown in the drawings, each of the first single frame cores 10 is formed by stacking thirteen first core cakes 15. The inner diameter of the first iron core cake 15 in the middle in the first direction is smallest, the inner diameter of the first iron core cake 15 from the middle to the two sides is gradually increased, and the outer diameter of each first iron core cake 15 in the first direction is equal. That is, the first core cakes 15 on both sides of the middle first core cake 15 are symmetrically arranged.

In some embodiments, the portions of each of the first single frame cores 10 located on both sides of the first window 13 in the third direction are two first chokes 14, respectively. The plurality of first core segments 15 of each first single frame core 10 have the same outer diameter in the third direction to form a third flat surface 142 on a side of the two first chokes 14 facing away from the first window 13. Wherein the third direction is perpendicular to the first direction and the second direction. Thus, the third flat surface 142 of the first yoke portion 14 is attached to the second single-frame iron core 20 to form the first iron yoke 231, which is beneficial to reducing the splicing difficulty and improving the splicing quality. Specifically to the embodiment shown in fig. 1, the third direction is an up-down direction.

Specifically, in the embodiment, the inner diameters of the plurality of first core segments 15 of each first single-frame core 10 in the third direction are gradually changed to form the second stepped inner wall 141 on the side of the two first chokes 14 facing the first window 13. Further, the inner diameter of each first core segment 15 of each first single-frame core 10 in the third direction gradually decreases and then gradually increases along the second direction, so that the second stepped inner wall 141 is in an arc shape protruding outward toward the first window 13, thereby facilitating the outer periphery of the first yoke 14 to be in an approximately circular or elliptical shape.

In particular to the embodiment shown in the drawings, the first single frame core 10 is formed by stacking thirteen first core cakes 15. The inner diameter of the first iron core cake 15 in the middle in the third direction is the smallest, the inner diameter of the first iron core cake 15 from the middle to the two sides of the middle is gradually increased, and the outer diameter of each first iron core cake 15 in the third direction is equal. That is, six first core cakes 15 located at one side of the middle layer first core cake 15 are arranged symmetrically with six first core cakes 15 located at the other side.

Referring to fig. 9, 10 and 11, in an embodiment of the present invention, the second single frame core 20 includes a plurality of second core cakes 25 stacked in the second direction, and each of the second core cakes 25 is formed by winding the second tapes 251 around the second direction. In this way, the second single-frame core 20 is formed by winding the second strip 251 to form the second core cake 25, and then stacking a plurality of second core cakes 25. The radial dimension of each second core cake 25 is proportional to the number of turns of the strip material wound. When the iron core of the large transformer needs to be manufactured, the radial size of the second iron core cake 25 is increased by only increasing the number of winding turns of the second strip 251, so that the large transformer can be conveniently manufactured.

Specifically, in the embodiment, each second iron core cake 25 has a second through hole 252 (see fig. 12) penetrating along the second direction, the plurality of second through holes 252 on the plurality of second iron core cakes 25 are coaxially arranged and communicated to form a second window 22, and the portions of the second single-frame iron core 20 located on both sides of the second window 22 in the first direction are two third mandrels 21 respectively.

The plurality of second core cakes 25 are of equal internal diameter in the first direction to form a second flat surface 213 on the side of the third stem 21 facing the second window 22. So, because the outside of the first stem 11 and the second stem 12 of two first single-frame iron cores 10 is first flat surface 122, the inboard of two third stems 21 of second single-frame iron core 20 is second flat surface 213, make the first flat surface 122 of two second stems 12 of two first single-frame iron cores 10 form two second iron core columns 211 with the laminating of the second flat surface 213 of two third stems 21 of second single-frame iron core 20 respectively, thereby reduced the concatenation degree of difficulty, promoted the concatenation quality.

Specifically to the embodiment, the outer diameters of the plurality of second iron core cakes 25 in the first direction are gradually changed, so as to form a first stepped outer wall 212 on one side of the third core column 21 departing from the second window 22, so that the first stepped outer walls 212 on the outer sides of the two third core columns 21 form an arc-shaped surface, after the two first single-frame iron cores 10 and the second single-frame iron core 20 are butted, the arc-shaped surface on the outer side of the third core column 21 of the second single-frame iron core 20 and the arc-shaped surface on the inner side of the second core column 12 of the first single-frame iron core 10 are spliced to form a second iron core column 211 with an outer periphery being approximately circular or elliptical, so that the coil is wound around the iron core column with an arc, excessive winding stress cannot be formed inside the coil column, the service life of the coil is prolonged, and the iron core is conveniently and efficiently wound.

Further, the outer diameter of the second plurality of iron core cakes 25 in the first direction gradually increases and then gradually decreases along the second direction, so that the first stepped outer wall 212 is in an arc shape protruding outwards away from the second window 22. In this way, the first stepped outer walls 212 on the outer sides of the two third stems 21 form an approximately semicircular arc surface or an approximately semicircular elliptical surface, so that the outer periphery of the second stem 211 is approximately circular or elliptical.

In particular to the embodiment shown in the drawings, the second single frame core 20 is formed by stacking thirteen second core cakes 25. The outer diameter of the second core cake 25 positioned in the middle in the first direction is the largest, the outer diameter of the second core cake 25 from the middle second core cake 25 to the second core cake 25 at both sides thereof is gradually reduced, and the inner diameters of the second core cakes 25 in the first direction are equal. That is, the six second core cakes 25 located at one side of the middle second core cake 25 are arranged symmetrically with the six second core cakes 25 located at the other side.

In some embodiments, the portions of the second single-frame core 20 located on both sides of the second window 22 in the third direction are two second chokes 23, respectively. The inner diameters of the plurality of second core segments 25 of the second single frame core 20 in the third direction are equal to form a fourth flat surface 233 on a side of the two second yoke portions 23 facing away from the second window 22. In this way, the first yokes 231 are formed by respectively attaching the fourth flat surfaces 233 of the second yokes 23 to the third flat surfaces 142 of the first yokes 14 of the two corresponding first single-frame cores 10, which is beneficial to reducing the splicing difficulty and improving the splicing quality.

In the embodiment, the outer diameters of the plurality of second core segments 25 of the second single frame core 20 in the third direction are gradually increased to form the second stepped outer wall 232 on the side of the two second yoke portions 23 facing the second window 22. Further, the outer diameter of each second iron core cake 25 of the second single-frame iron core 20 in the third direction gradually decreases and then gradually increases along the second direction, so that the second stepped outer wall 232 is in an arc shape protruding outward away from the second window 22. In this manner, the outer circumference of the first yoke 231 is made to be approximately circular or elliptical.

In particular to the embodiment shown in the drawings, the second single frame core 20 is formed by stacking thirteen second core cakes 25. The outer diameter of the second core cake 25 positioned in the middle in the third direction is the largest, the outer diameter of the second core cake 25 from the middle second core cake 25 to the second core cake 25 at both sides thereof is gradually reduced, and the inner diameters of the second core cakes 25 in the third direction are equal. That is, the six second core cakes 25 located at one side of the middle second core cake 25 are symmetrically arranged with the six second core cakes 25 located at the other side.

It should be further noted that, because the peripheries of the first core leg 110 and the second core leg 211 are approximately circular or elliptical, a circular or elliptical coil can be adopted around the coil arranged on the first core leg 110 and the second core leg 211, compared with a rectangular coil adopted in the prior art, the circular or elliptical coil has stronger short-circuit resistance, and the operational reliability of the transformer can be greatly improved.

Alternatively, the number of the first core cakes 15 of each first single-frame core 10 is 3 to 100. The thickness dimension of the first single-frame core 10 in the second direction is 50mm to 1000mm. The number of the second core cakes 25 of the second single frame core 20 is 3 to 100. The thickness dimension of the second single-frame core 20 in the second direction is 50mm to 1000mm.

Referring to fig. 1, in an embodiment, the three-phase three-column planar core further includes a first insulating member 41, and the first insulating member 41 is disposed between the two first single-frame cores 10, so that the two first single-frame cores 10 are insulated by the first insulating member 41. The three-phase three-column planar core further includes a second insulating member 42, and the second insulating member 42 is disposed between each of the first single-frame cores 10 and the second single-frame core 20, so that each of the first single-frame cores 10 and the second single-frame core 20 is insulated by the second insulating member 42. The three-phase three-column planar iron core further comprises a third insulating part 43, wherein the third insulating part 43 is arranged in a gap formed between the two first single-frame iron cores 10 and the second single-frame iron cores 20, so that the gap is filled, and the two first single-frame iron cores 10 and the second single-frame iron cores 20 are insulated from each other. In this way, the first insulating member 41, the second insulating member 42 and the third insulating member 43 ensure that the two first single frame cores 10 and the second single frame core 20 are insulated from each other, so as to avoid direct contact with each other to cause multipoint grounding, thereby preventing the transformer from being burnt in operation. Alternatively, the first insulating member 41 and the second insulating member 42 may be, but not limited to, cable paper, highland barley paper, cardboard, etc. The third insulating member 43 may be, but is not limited to, a laminated wood board, a laminated paper board, a circular glass cloth board, or the like.

In the embodiment, the first core legs 11, one of the first yoke portions 14, the second core leg 12 and the other first yoke portion 14 of the first single frame core 10 are sequentially connected end to end and enclose the first window 13. The first core column 11 is in arc transition with the corresponding first choke 14, and the second core column 12 is in arc transition with the corresponding first choke 14. The gap is formed at the arc edge of the joint of the two first mandrels 11 of the two first single-frame cores 10 and the same first choke portion 14, and the third insulating member 43 is filled in the gap.

One of the third legs 21, one of the second yoke portions 23, the other of the third legs 21, and the other of the second yoke portions 23 of the second single-frame core 20 are sequentially connected end to end and enclose a second window 22. The junction of each third stem 21 with each second yoke 23 is in the form of a circular arc transition.

Referring to fig. 7, in the specific embodiment, a first annular inner support 153 is disposed on the inner side of each first iron core cake 15, and a first annular outer support 154 is disposed on the outer side of each first iron core cake 15. In this way, the first core cake 15 is supported and protected by the first annular inner support 153 and the first annular outer support 154, thereby improving the overall strength and the like of the first core cake 15. Alternatively, the first annular inner support 153 and the first annular outer support 154 may be made of a silicon steel strip wound by 1-3 layers, or a strip made of other metal materials, which is not limited herein. The thickness of the strip material wound to form the first annular inner support 153 and the first annular outer support 154 is 0.1mm to 10mm, and the width thereof is adapted to the width of the first strip material 151.

Referring to fig. 12, a second annular inner support 253 is disposed on the inner side of each second iron core cake 25, and a second annular outer support 254 is disposed on the outer side of each second iron core cake 25. In this way, the second core cake 25 is supported and protected by the second annular inner support 253 and the second annular outer support 254, so that the overall strength and the like of the first core cake 15 are improved. Alternatively, the second annular inner support 253 and the second annular outer support 254 can be made of a silicon steel strip wound in 1-3 layers, or other metal strips, which is not limited herein. The thickness of the band material wound around the second annular inner support 253 and the second annular outer support 254 is 0.1mm to 10mm, and the width thereof is adapted to the width of the second band material 251.

Alternatively, the first ribbon 151 wound to form the first core cake 15 and the second ribbon 251 wound to form the second core cake 25 may employ amorphous alloy ribbons. As an example, the amorphous alloy ribbon may be made of an iron-based amorphous alloy material, which is not limited herein.

Alternatively, the first and second ribbons 151 and 251 may have a thickness of 0.01mm to 0.03mm and a width of 10mm to 150mm. Each of the first core cakes 15 may be formed by winding the first strip materials 151 having the same width, or by winding the first strip materials 151 having different widths. Each second core cake 25 can be formed by winding the second strip material 251 with the same width dimension, or can be formed by winding the second strip material 251 with different width dimensions.

Specifically, in the embodiment, each of the first single-frame core 10 and the second single-frame core 20 is coated with a cured layer that cures each of the first core cakes 15 of the first single-frame core 10 into one piece and each of the second core cakes 25 of the second single-frame core 20 into one piece. So, solidified layer has improved three-phase three-column plane iron core's structural strength and anti short circuit ability to reduce the noise. And, the production of amorphous piece can also be prevented when adopting the suit mode assembly coil in the solidified layer to improve the operational safety of the transformer of production. Alternatively, the cured layer may be formed by curing resin glue, resin paint or glass glue, or other glues with adhesive effect, which is not limited herein.

Referring to fig. 1, in the embodiment, the three-phase three-column planar core further includes a first grounding member 30 and a second grounding member 31, a first grounding member 30 is disposed between a first yoke 14 of each first single-frame core 10 and a second yoke 23 of the corresponding second single-frame core 20, and the first grounding member 30 is used for connecting the first single-frame core 10 and the second single-frame core 20. A second yoke portion 23 of the second single frame core 20 is provided with a second grounding member 31, and the second grounding member 31 is used for grounding when the transformer is assembled so as to ensure the safety of the transformer.

Specifically to the embodiment, three-phase three-column planar iron core still includes the ligature area, and two first single frame iron cores 10 and the single frame iron core 20 amalgamation back utilize the ligature area to ligature, are favorable to improving three-phase three-column planar iron core's bulk strength.

It should be noted that the second single-frame core 20 is not limited to being formed by winding the strip material to form the core cake and then stacking the core cakes. In other embodiments, the second single-frame core 20 may also be formed by winding the third strip directly. Referring to fig. 9, in the present embodiment, the second single-frame core 20 has a second window 22 penetrating along the second direction, the two first single-frame cores 10 are accommodated in the second window 22, and two third core pillars 21 are respectively formed at two sides of the second single-frame core 20 in the first direction of the second window 22. The second single-frame iron core 20 is formed by winding a third strip around the second window 22, and the bandwidth of the third strip is gradually reduced, so that a second flat surface 213 is formed on one side of each third stem 21 facing the second window 22, a second stepped outer wall 212 is formed on one side of each third stem 21 facing away from the second window 22, and the second stepped outer wall 212 is in an arc shape protruding outwards away from the second window 22.

So, the inboard of two third stems 21 of second single frame iron core 20 is second plane 213 for the laminating of the first plane 122 of two second stems 12 of two first single frame iron cores 10 and the second plane 213 of two third stems 21 of second single frame iron core 20 respectively forms two second iron stem posts 211, thereby has reduced the concatenation degree of difficulty, has promoted the concatenation quality. And, the second stepped outer wall 212 at the outer side of the two third legs 21 forms an arc surface, after the two first single-frame cores 10 and the second single-frame core 20 are butted, the second stepped outer wall 212 at the outer side of the third leg 21 of the second single-frame core 20 and the first stepped inner wall 121 at the inner side of the second leg 12 of the first single-frame core 10 are spliced to form an approximately circular or oval second core leg 211 periphery, so that the coil is wound around the core leg with an arc, excessive winding stress cannot be formed inside the coil, the service life of the coil is prolonged, and the core is conveniently and efficiently wound.

Further, portions of the second single-frame core 20 located on both sides of the second window 22 in the third direction are two second chokes 23, respectively. It is understood that, in the second single frame core 20 formed by winding the third strip material with the gradually decreasing band width, the side (i.e., the inner side) of the two second chokes 23 facing the second window 22 is the fourth flat surface 233, and the side (i.e., the outer side) of the two second chokes 23 facing away from the second window 22 is the second stepped outer wall 232. In this way, the fourth flat surface 233 of the second yoke 23 of the second single frame core 20 is bonded to the third flat surfaces 142 of the first yokes 14 of the two first single frame cores 10. The second stepped outer wall 232 of the second yoke portion 23 of the second single frame core 20 is abutted against the first stepped inner walls 141 of the first yoke portions 14 of the two first single frame cores 10 to form a first yoke 231 having an outer periphery of an approximately circular or elliptical shape.

Referring to fig. 13, based on the three-phase three-column planar iron core, the present invention further provides a method for manufacturing a three-phase three-column planar iron core, including the steps of:

s10, winding a first strip material 151 to form a first iron core cake 15;

s20, stacking a plurality of first iron core cakes 15 to form a first single-frame iron core 10;

and S30, arranging the two first single-frame iron cores 10 in the second single-frame iron core 20 side by side, and splicing to form a three-phase three-column planar iron core.

Referring to fig. 14, further, the step S10 specifically includes:

s101, a first circular ring-shaped core cake 15a is formed by winding the first strip material 151 (see fig. 8).

Specifically, the first annular inner support 153 is first wound, then the first belt material 151 is wound on the first annular inner support 153 to form a first discus layer, and finally the first annular outer support 154 is wound on the first discus layer, so as to form the first annular core cake 15a.

S102, squaring the first circular ring-shaped iron core cake 15a to form a rectangular first iron core cake 15.

Specifically, a circular-support square process is adopted, and a forming device (such as a forming machine) and a mold are utilized to support the circular-ring-shaped first circular-ring-shaped iron core cake 15a from inside to outside to form the first iron core cake 15 with a similar rectangular frame structure.

Further, the steps S10 and S20 further include the steps of:

the first core cake 15 is heat-treated and annealed.

Alternatively, the temperature of the heat treatment annealing may be 300 to 400 ℃, and the time of the heat treatment annealing may be 3 to 12 hours.

Specifically, the heat treatment annealing process is carried out in a protective gas atmosphere, and the protective gas is nitrogen or inert gas so as to prevent the iron core cake from being rusted in the heat treatment annealing process.

Specifically, the heat treatment annealing process is carried out under the condition of a direct-current magnetic field, namely, the direct-current magnetic field is added to the first iron core cake during the heat treatment annealing process so as to improve the working magnetic domain direction of the amorphous alloy strip in the first iron core cake, and therefore the forming stress and the magnetic performance of the first iron core cake can be completely eliminated.

Further, step S30 specifically includes:

first, the two first single-frame cores 10 and the second single-frame core 20 are spliced and combined, and the first insulator 41, the second insulator 42, and the third insulator 43 are placed. Then, the two first and second single- frame cores 10 and 20 are cured.

Specifically, the protective layer is formed by dipping, brushing, coating, or the like, so that the first single frame iron core 10 and the second single frame iron core 20 are cured into a whole, thereby improving the strength and short-circuit resistance of the three-phase three-column planar iron core, and reducing the noise of the three-phase three-column planar iron core.

Referring to fig. 15, in an embodiment of the present invention, before the step S30, the method further includes the steps of:

s31, winding a second strip material 251 to form a second iron core cake 25;

s32, stacking the plurality of second core cakes 25 to form the second single-frame core 20.

Referring to fig. 16, further, step S31 specifically includes:

and S311, winding the second strip material 251 to form a second circular ring-shaped iron core cake.

Specifically, the second annular inner support 253 is first wound, then the second annular inner support 253 is wound with the second strip 251 to form a second iron core cake layer, and finally the second annular outer support 254 is wound on the second iron core cake layer, so as to form a second annular iron core cake.

And S312, squaring the second circular ring-shaped iron core cake to form a rectangular second iron core cake 25.

Specifically, the second circular ring-shaped iron core cake with a circular ring shape is supported from inside to outside by a circular support square process and a forming device (such as a forming machine) and a mould to form the second iron core cake 25 with a similar rectangular frame structure.

S313, annealing the second core cake 25 by heat treatment.

Alternatively, the temperature of the heat treatment annealing may be 300 to 400 ℃, and the time of the heat treatment annealing may be 3 to 12 hours.

Specifically, the heat treatment annealing process is carried out in a protective gas atmosphere, and the protective gas is nitrogen or inert gas so as to prevent the iron core cake from being rusted in the heat treatment annealing process.

Specifically, the heat treatment annealing process is carried out under the condition of a direct-current magnetic field, namely, the direct-current magnetic field is added to the first iron core cake during the heat treatment annealing process so as to improve the working magnetic domain direction of the amorphous alloy strip in the first iron core cake, and therefore the forming stress and the magnetic performance of the first iron core cake can be completely eliminated.

It should be noted that the second single-frame iron core 20 is not limited to be formed by winding the second strip 251 to form the second iron core cake 25 and then stacking the second iron core cake, and in another embodiment, the step S30 further includes the following steps:

the second single-frame iron core 20 is formed by winding a third strip material, and the bandwidth of the third strip material is gradually reduced, so that a second flat surface 213 is formed on one side of each third core pillar 21 of the second single-frame iron core 20, which faces the second window 22, and a first stepped outer wall 212 is formed on one side of each third core pillar 21, which faces away from the second window 22, and the first stepped outer wall 212 is in an arc shape which protrudes outwards, which faces away from the second window 22.

Based on the three-phase three-column planar iron core, the invention further provides a transformer, which comprises the three-phase three-column planar iron core in any one of the embodiments. Specifically, the transformer may be an oil-immersed transformer, a dry-type transformer, or another type of transformer, which is not limited herein.

All possible combinations of the technical features of the above embodiments may not be described for the sake of brevity, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent should be subject to the appended claims.

Claims (12)

1. A three-phase three-column planar iron core, comprising:

the two single-frame iron cores (10) are respectively provided with a first core column (11) and a second core column (12) at two sides of each first single-frame iron core (10) along a first direction, the two first single-frame iron cores (10) are arranged side by side along the first direction, and the two first core columns (11) of the two first single-frame iron cores (10) are butted to form a first iron core column (110); and

the second single-frame iron core (20) is provided with third core columns (21) on two sides along the first direction and sleeved on the peripheries of the two first single-frame iron cores (10), and the two third core columns (21) are respectively butted with the second core columns (12) of the two first single-frame iron cores (10) to form two second core column (211);

wherein each first single-frame core (10) includes a plurality of first core cakes (15) stacked in a second direction intersecting the first direction, each of the first core cakes (15) being formed by winding a first strip material (151) around the second direction.

2. The three-phase three-limb planar core according to claim 1, wherein each first core cake (15) has a first through hole (152) penetrating along the second direction, the first through holes (152) of the first core cakes (15) in each first single-frame core (10) are coaxially arranged and communicated to form a first window (13), and the parts of each first single-frame core (10) on both sides of the first window (13) in the first direction are the first core limb (11) and the second core limb (12), respectively;

a plurality of the first core cakes (15) of each of the first single frame cores (10) have equal outer diameters in the first direction to form a first flat surface (122) on a side of the first core column (11) and the second core column (12) facing away from the first window (13); the inner diameter of a plurality of first iron core cakes (15) of each first single-frame iron core (10) in the first direction is gradually changed, so that a first step-shaped inner wall (121) is formed on one side, facing the first window (13), of the first core column (11) and the second core column (12).

3. The three-phase three-limb planar core according to claim 2, wherein the inner diameter of each first core cake (15) of each first single-frame core (10) in the first direction gradually decreases and then gradually increases along the second direction, so that the first stepped inner wall (121) is in an arc shape convex outward toward the first window (13).

4. The three-phase three-limb planar core according to any one of claims 1 to 3, wherein the second single-frame core (20) comprises a plurality of second core biscuits (25) stacked in the second direction, each of the second core biscuits (25) being formed by winding a second strip material (251) around the second direction.

5. The three-phase three-column planar iron core according to claim 4, wherein each second iron core cake (25) is provided with a second through hole (252) penetrating along the second direction, the second through holes (252) on the second iron core cakes (25) are coaxially arranged and communicated to form a second window (22), and the parts of the second single-frame iron core (20) on two sides of the second window (22) in the first direction are respectively two third columns (21);

-a plurality of said second discus cores (25) having an equal inner diameter in said first direction to form a second plane (213) on the side of said third mandrel (21) facing said second window (22); the outer diameter of the second iron core cakes (25) is gradually changed in the first direction to form a first stepped outer wall (212) on the side of the third mandrel (21) facing away from the second window (22).

6. The three-phase three-limb planar core according to claim 5, wherein the outer diameters of the second core cakes (25) in the first direction are gradually increased and then gradually decreased along the second direction, so that the first stepped outer wall (212) is in an arc shape which is convex outward away from the second window (22).

7. The three-phase three-column planar core according to any one of claims 1 to 3, wherein the second single-frame core (20) has a second window (22) penetrating in the second direction, two of the first single-frame cores (10) are accommodated in the second window (22), and two of the third core columns (21) are respectively located at portions of the second single-frame core (20) located at both sides of the second window (22) in the first direction;

the second single-frame iron core (20) is formed by winding a third strip around the second window (22), the bandwidth of the third strip is gradually reduced, so that one side, facing the second window (22), of each third core column (21) forms a second flat surface (213), one side, facing away from the second window (22), of each third core column (21) forms a first stepped outer wall (212), and the first stepped outer wall (212) is in an arc shape protruding outwards and facing away from the second window (22).

8. The three-phase three-limb planar core according to any one of claims 1 to 3, further comprising a first insulator (41), wherein the first insulator (41) is disposed between two first single-frame cores (10);

the three-phase three-column planar iron core further comprises a second insulating piece (42), and the second insulating piece (42) is arranged between each first single-frame iron core (10) and each second single-frame iron core (20);

the three-phase three-column planar iron core further comprises a third insulating piece (43), wherein the third insulating piece (43) is arranged in a gap formed between the first single-frame iron core (10) and the second single-frame iron core (20).

9. A method of manufacturing a three-phase three-limb planar core according to any one of claims 1 to 8, comprising the steps of:

winding a first strip (151) to form a first core cake (15);

stacking a plurality of the first core cakes (15) to form a first single-frame core (10);

and arranging the two first single-frame iron cores (10) in a second single-frame iron core (20) side by side.

10. The method for manufacturing a three-phase three-column planar iron core according to claim 9, wherein the step of arranging the two first single-frame iron cores (10) side by side in the second single-frame iron core (20) further comprises the steps of:

winding a second strip material to form a second iron core cake (25);

a plurality of the second core cakes (25) are stacked to form a second single-frame core (20).

11. The method for manufacturing a three-phase three-column planar iron core according to claim 9, wherein the step of arranging the two first single-frame iron cores (10) side by side in the second single-frame iron core (20) further comprises the steps of:

and winding a third strip material to form a second single-frame iron core (20), wherein the bandwidth of the third strip material is gradually reduced.

12. A transformer comprising a three-phase three-limb planar core according to any one of claims 1 to 8.

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