CN109346289B - Transformer laminated core and preparation method thereof - Google Patents
Transformer laminated core and preparation method thereof Download PDFInfo
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- CN109346289B CN109346289B CN201811332011.4A CN201811332011A CN109346289B CN 109346289 B CN109346289 B CN 109346289B CN 201811332011 A CN201811332011 A CN 201811332011A CN 109346289 B CN109346289 B CN 109346289B
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- H01—ELECTRIC ELEMENTS
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Abstract
A transformer laminated iron core comprises columns respectively positioned at the left, right and middle parts and yokes positioned at the upper and lower parts, wherein the column section and the yoke section of the iron core are polygons formed by rectangles and a plurality of levels of trapezoids, the rectangles are positioned in the middle of the polygons, the levels of the trapezoids are positioned at two sides of the long sides of the rectangles, and the bottom sides of the trapezoids at the sides are connected with the long sides of the rectangles after being sequentially connected; the method is characterized in that: the lengths of the adjacent bottom edges of two adjacent stages of trapezoids in the column section and the yoke section are different, and the length of the bottom edge of the trapezoid closer to the rectangle is larger; and the area of the yoke cross-section is greater than the area of the column cross-section. The invention also discloses a preparation method of the transformer laminated core. Compared with the prior art, the laminated iron core has the advantages that the filling rate is high, the power loss is low, the replacement times of the trapezoidal silicon steel strips can be reduced in the preparation process, the production efficiency is improved, and the cost is reduced.
Description
Technical Field
The invention belongs to the technical field of transformer parts, and particularly relates to a transformer laminated core and a preparation method thereof.
Background
At present, the laminated transformer core is formed by stacking multiple stages of silicon steel sheets with different widths, and the profile section of a core column or a yoke of the laminated transformer core is of a stepped circular (as shown in fig. 1), stepped oblong or stepped elliptical structure consisting of multiple stages of rectangles. The iron core structure of the transformer disclosed in the utility model patent with application number CN00212756.3, a distribution transformer (with application number CN2431630Y) and the utility model patent with application number CN201420803446.3, a novel iron core structure of three-phase five-column high-capacity transformer (with application number CN204257346U) is of a laminated type.
In the design of the existing transformer, how to design the section of the iron core is an important link, and the use effect and the production cost of the whole transformer are related. For this reason, the invention patent with application number CN201110000854.6, "optimum design method for core column section of power transformer" (publication number CN102208274B) solves the design of optimum core section by programming, thereby liberating manual solution, increasing calculation speed, but does not substantially improve the core section in structure, and does not reach ideal filling factor.
The cross section of the laminated core is of a step structure, and generally at least 7 steps are needed to ensure that the filling rate of the coil inner core meets the use requirement. Therefore, when the silicon steel sheets with 7-18 specifications need to be cut during processing, when the silicon steel sheets with one specification are stacked, the silicon steel sheets with the other specification need to be replaced for stacking, and the operation is repeated in such a circulating way until all the silicon steel sheets are stacked to obtain the iron core. The section coefficient of the prepared iron core is only 90.5-93%, and the filling rate is low; and the silicon steel sheets need to be continuously replaced in the preparation process, resulting in low production efficiency.
In order to overcome the above defects, the invention patent application No. CN201710981565.6, which is referred to as CN201710981565.6, discloses an iron core structure for increasing the filling rate of an iron core and a shearing and assembling method thereof (application publication No. CN107658110A), which uses multi-level trapezoids to form a polygonal iron core section, thereby effectively increasing the filling rate of the iron core and reducing the iron core cost, but according to the description of "the lengths of the adjacent bottom sides of two adjacent levels of trapezoids in the core column section or the yoke section are the same" and in combination with the description of the embodiment, a person skilled in the art can know that the manufacturing process of the iron core is to shear the iron core section of one column or yoke by using one trapezoidal silicon steel sheet, so that the shearing of two side columns, center columns, and upper and lower iron yokes of one level trapezoids can be completed only by replacing 5 trapezoidal sheets, which results in low manufacturing efficiency and cannot meet the requirements of automatic shearing and stacking. Especially, with the continuous adoption of the existing automatic iron core production equipment, the time for replacing the silicon steel sheet on the equipment can be more than several times of the shearing time, if the specifications of the silicon steel sheet are more, the time for replacing the silicon steel sheet is greatly wasted, and the production efficiency of the automatic equipment is greatly reduced.
Disclosure of Invention
The first technical problem to be solved by the present invention is to provide a laminated transformer core with high filling rate and low power loss, aiming at the current situation of the prior art.
The second technical problem to be solved by the present invention is to provide a method for manufacturing a laminated core of a transformer, aiming at the current situation of the prior art, so as to reduce the replacement times of the trapezoidal silicon steel strips, thereby improving the production efficiency and reducing the cost.
The technical scheme adopted by the invention for solving the first technical problem is as follows: a transformer laminated iron core comprises columns respectively positioned at the left, right and middle parts and yokes positioned at the upper and lower parts, wherein the column section and the yoke section of the iron core are polygons formed by rectangles and a plurality of levels of trapezoids, the rectangles are positioned in the middle of the polygons, the levels of the trapezoids are positioned at two sides of the long sides of the rectangles, and the bottom sides of the trapezoids at the sides are connected with the long sides of the rectangles after being sequentially connected; the method is characterized in that: the lengths of the adjacent bottom edges of two adjacent stages of trapezoids in the column section and the yoke section are different, and the length of the bottom edge of the trapezoid closer to the rectangle is larger; and the area of the yoke cross-section is greater than the area of the column cross-section.
In order to further improve the filling rate and reduce the loss, the column section and/or the yoke section of the iron core are/is preferably circular, long circular or elliptical inscribed polygons.
The iron core is preferably of a three-phase three-limb structure.
The technical scheme adopted by the invention for solving the second technical problem is as follows: the preparation method of the laminated iron core of the transformer is characterized by comprising the following steps of:
firstly, manufacturing a first-stage iron core corresponding to a first-stage trapezoid positioned at the bottom of the polygon in the column section and the yoke section: longitudinally cutting the silicon steel sheet coiled material at a required angle with the length direction to obtain a first-stage trapezoidal silicon steel sheet strip; sequentially and transversely cutting the small end of the first-stage trapezoidal silicon steel strip as an initial end along the length direction of the first-stage trapezoidal silicon steel strip, and sequentially cutting the small end into a plurality of left and right column sheets, a middle column sheet, a lower yoke sheet and an upper yoke sheet which are the same in number to obtain a plurality of silicon steel sheets of the first-stage iron core; laminating a plurality of silicon steel sheets of the primary iron core by one sheet or a group of sheets in small and large sizes, wherein the laminated sheets are sequentially a left column sheet, a right column sheet, a middle column sheet, an upper yoke sheet and a lower yoke sheet to obtain the primary iron core;
secondly, manufacturing a secondary iron core corresponding to a second-stage trapezoid in the column section and the yoke section: longitudinally cutting the silicon steel sheet coiled material at a required angle with the length direction to obtain a second-stage trapezoidal silicon steel sheet strip, wherein the width of the small end of the second-stage trapezoidal silicon steel sheet strip is the width of the large end of the first-stage trapezoidal silicon steel sheet strip after the last upper yoke sheet is cut in the step one; sequentially and transversely cutting the second-stage trapezoidal silicon steel strips along the length direction of the second-stage trapezoidal silicon steel strips by taking the small end of the second-stage trapezoidal silicon steel strips as an initial end, wherein the cutting sequence is the same as the cutting sequence in the first step, and a plurality of silicon steel sheets of the second-stage iron core are obtained; laminating a plurality of silicon steel sheets of the secondary iron core on the basis of the primary iron core according to the size of a single sheet or a group of a plurality of sheets at one time from small to large, and sequentially laminating the sheets with the lamination in the first step to obtain the secondary iron core, wherein the column section and the yoke section of the secondary iron core are a second-stage trapezoid which is positioned above and adjacent to the first-stage trapezoid;
thirdly, manufacturing an iron core corresponding to the ladder of the subsequent required stage number positioned on one side of the rectangle in the column section and the yoke section according to the rule of the first step and the second step until an N-stage iron core is obtained, wherein the column section and the yoke section of the N-stage iron core are the Nth-stage ladder which is positioned above the Nth-1-stage ladder and adjacent to the Nth-1-stage ladder; wherein N is a natural number greater than or equal to 2;
fourthly, manufacturing a middle-stage iron core corresponding to the rectangle in the column section and the yoke section: longitudinally cutting rectangular silicon steel sheet strips on the silicon steel sheet coiled material according to the size of the transformer laminated iron core; the width of the rectangular silicon steel strip is the width of the big end of the Nth-level trapezoidal silicon steel strip after the last yoke piece in the N-level iron cores is cut in the third step; transversely cutting a plurality of left and right column sheets, middle column sheets, upper yoke sheets and lower yoke sheets which are the same in number along the length direction of the rectangular silicon steel strip by taking one end of the rectangular silicon steel strip as an initial end to obtain a plurality of silicon steel sheets of the middle-level iron core; laminating a plurality of silicon steel sheets of the middle-level iron core on the basis of the N-level iron core prepared in the third step, and preparing the middle-level iron core, namely the N + 1-level iron core, by sequentially laminating the plurality of silicon steel sheets in the first step;
fifthly, manufacturing an N + 2-stage iron core corresponding to the N + 2-stage trapezoid positioned on the other side of the rectangle in the column section and the yoke section: longitudinally cutting the silicon steel sheet coiled material at a required angle with the length direction to obtain an N +2 th-level trapezoidal silicon steel sheet strip with the same specification as the nth-level trapezoidal silicon steel sheet strip, sequentially and transversely cutting the nth +2 th-level trapezoidal silicon steel sheet strip along the length direction of the N +2 th-level trapezoidal silicon steel sheet strip by taking the small head end of the nth +2 th-level trapezoidal silicon steel sheet strip as the starting end, and sequentially cutting the nth +2 th-level trapezoidal silicon steel sheet strip in the same cutting sequence in the first step to obtain a plurality of silicon steel sheets of the N + 2-level iron core; laminating a plurality of silicon steel sheets of the N + 2-level iron core on the basis of the N + 1-level iron core according to the size of the iron core, wherein the size of the silicon steel sheets is changed from large to small, and the lamination sequence is the same as that of the lamination sequence in the step one, so that the N + 2-level iron core is obtained;
sixthly, manufacturing an N + 3-level iron core corresponding to the N + 3-level trapezoid positioned on the other side of the rectangle in the column section and the yoke section: longitudinally cutting the silicon steel sheet coiled material at a required angle with the length direction to obtain an N +3 th-level trapezoidal silicon steel sheet strip with the same specification as the N-1 st-level trapezoidal silicon steel sheet strip, sequentially and transversely cutting the small end of the N +3 th-level trapezoidal silicon steel sheet strip along the length direction of the N +3 th-level trapezoidal silicon steel sheet strip by taking the small end of the N +3 th-level trapezoidal silicon steel sheet strip as an initial end, and sequentially cutting the silicon steel sheet strip in the same manner as the cutting in the first step to obtain a plurality of silicon steel sheets of the N + 3-level iron core; laminating a plurality of silicon steel sheets of the N + 3-level iron core on the basis of the N + 2-level iron core according to the size by one sheet or a group of sheets at a time, wherein the lamination sequence is the same as that in the step I to prepare the N + 3-level iron core, and the column section and the yoke section of the N + 3-level iron core are an N + 3-level trapezoid which is positioned above the N + 2-level trapezoid and is adjacent to the N + 2-level trapezoid;
seventhly, manufacturing the iron core corresponding to the trapezoid of the column section and the yoke section, which are positioned on the other side of the rectangle and have the required subsequent stages, according to the rule of the fifth step and the sixth step until a 2N + 1-stage iron core is obtained, namely manufacturing the complete transformer laminated iron core, wherein the column section and the yoke section of the 2N + 1-stage iron core are 2N + 1-stage trapezoids which are positioned above the 2N-stage trapezoids and adjacent to the 2N-stage trapezoids;
the transverse cutting adopts a cutting mode that a positive and negative knife forming a required angle with the length direction is alternated.
In order to improve the production efficiency, as an improvement, the trapezoidal silicon steel sheet strips with the same specification can be cut in a sleeving way after silicon steel sheet coiled materials are stacked up and down. Because the lengths of the adjacent bottom edges of the two adjacent stages of trapezoids in the column section and the yoke section are different, even if the trapezoid silicon steel strips after suit cutting have slight difference, subsequent cutting and stacking cannot be influenced.
In order to improve the lamination efficiency and the precision quality, the silicon steel sheets are laminated on an iron core lamination platform, each silicon steel sheet is provided with at least one positioning hole, and the iron core lamination platform is convexly provided with a positioning rod which can penetrate through the positioning holes and perform positioning lamination on the silicon steel sheets.
Preferably, the left and right column pieces are cut sequentially, namely, at least three left column pieces are cut first, and then the right column pieces with the same number as the left column pieces are cut; or cutting a left column slice first, then cutting a right column slice, and then cutting a left column slice, and repeating the steps to cut at least three left column slices and right column slices with the same number as the left column slices.
Finally, the lower yoke pieces and the upper yoke pieces are cut sequentially, namely a plurality of lower yoke pieces with the same number as that of the left column pieces are cut first, and a plurality of upper yoke pieces with the same number as that of the lower yoke pieces are cut later; or cutting a lower yoke piece, then cutting an upper yoke piece, and then cutting a lower yoke piece, and repeating the steps to cut the lower yoke pieces with the same number as the left column pieces and the upper yoke pieces with the same number as the lower yoke pieces.
Compared with the prior art, the invention has the advantages that:
1. two side columns, a middle column and upper and lower yokes in one level of the iron core are cut from one trapezoidal silicon steel strip, so that the specifications of the trapezoidal silicon steel strip required to be used are less and are less than half of the specifications of the trapezoidal silicon steel strip required to be used in the prior art, and thus, the frequency of replacing the silicon steel strip is greatly reduced, and the production efficiency is improved;
2. the invention is suitable for automatic iron core production equipment because the times of replacing silicon steel sheets are greatly reduced, can greatly reduce the manufacturing cost and the labor cost, can improve the lamination efficiency and quality, and reduces the loss of the iron core by at least more than 5% in the manual carrying and lamination processes;
3. because the two side columns, the middle column and the upper and lower yoke sheets are circularly sheared and stacked on the trapezoidal silicon steel sheet strip, the sectional area of the yoke is slightly larger than that of the column, and the iron core loss can be reduced by at least 1 percent; compared with the existing iron core, the iron core has a high section coefficient which can reach 93-98%, and the utilization rate of materials is improved by more than 10%.
Drawings
FIG. 1 is a cross-sectional view of a leg of a laminated transformer core of the prior art;
FIG. 2 is a schematic view showing the positions of the left and right side columns, the center column, the upper and lower yokes in example 1 of the present invention;
FIG. 3 is a sectional view taken along line E-E in FIG. 2;
FIG. 4 is a schematic structural view of a rectangular silicon steel strip in example 1 of the present invention;
fig. 5 is a schematic structural view of a first-stage trapezoidal silicon steel strip in embodiment 1 of the present invention;
FIG. 6 is a schematic diagram showing the cutting sequence of the left and right pole pieces, the middle pole piece, and the upper and lower yoke pieces in example 1 of the present invention;
FIG. 7 is a cross-sectional view of a leg of a laminated core of a transformer in embodiment 2 of the present invention;
FIG. 8 is a schematic diagram showing the cutting sequence of the left and right pole pieces, the middle pole piece, and the upper and lower yoke pieces in example 2 of the present invention;
fig. 9 is a cross-sectional view of a leg of a laminated core for a transformer in embodiment 3 of the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
Example 1:
as shown in fig. 2 to 6, the laminated transformer core and the method for manufacturing the same according to embodiment 1 of the present invention has a three-phase three-limb core structure, and as shown in fig. 2, includes left, right and middle limbs (left limb 1, right limb 2 and middle limb 3, respectively) and upper and lower yokes (upper yoke 4 and lower yoke 5, respectively).
Wherein the column cross-section and the yoke cross-section of the iron core are polygons composed of a middle-stage rectangle a and a plurality of stages of trapezoids B, as shown in fig. 3, the column cross-section in this embodiment is a circle inscribed hexadecagon, the yoke cross-section is not shown in the figure, but is also a circle inscribed hexadecagon, the rectangle a is located in the middle of the polygon, each stage of trapezoids B is located on both sides of the long side of the rectangle a (in this embodiment, the upper and lower sides of the rectangle a are respectively provided with three stages of trapezoids B, so that the upper and lower three stages of trapezoids B and the middle-stage rectangle a form a seven-stage structure of the iron core, the first-stage iron core cross-section from bottom to top is the first-stage trapezium B1, the second-stage iron core cross-section is the second-stage trapezium B2, the third-stage iron core cross-section is the third-stage trapezium B3, the fourth-stage iron core cross-section is the rectangle a, the fifth-stage iron core cross-section is the fifth-stage trapezium B5, and the sixth-stage iron core cross-section is the sixth-stage trapezium B6, The section of the seven-stage iron core is a seventh-stage trapezoid B7), the bottom edges of the trapezoids B at each side are sequentially connected and then connected with the long edge of the rectangle A, the lengths of the adjacent bottom edges of the adjacent two-stage trapezoids B in the column section and the yoke section are slightly different, and the length of the bottom edge of the trapezoid B closer to the rectangle A is larger; the areas of the respective yoke and column sections are different and the area of the yoke section is slightly larger than the area of the column section.
The preparation method of the transformer laminated core comprises the following steps:
firstly, manufacturing a first-stage iron core corresponding to a first-stage trapezoid in the column section and the yoke section: placing the silicon steel sheet coiled material to be cut on a material placing frame of an automatic cutting line, and longitudinally cutting the silicon steel sheet coiled material at a required angle with the length direction according to the size of the transformer laminated core to obtain a first-stage trapezoidal silicon steel sheet strip, as shown in fig. 5; the small end of the first-stage trapezoidal silicon steel strip 200 is taken as a starting end, the first-stage trapezoidal silicon steel strip 200 is sequentially transversely cut along the length direction of the first-stage trapezoidal silicon steel strip 200, and the cutting sequence is a plurality of left and right column pieces 11, 21, a middle column piece 31, a lower yoke piece 51 and an upper yoke piece 41 which are the same in number (the width of the first-stage trapezoidal silicon steel strip 200 is increased along the length direction from the small end, because the upper yoke piece 41 and the lower yoke piece 51 are sequentially cut behind the left and right column pieces 11, 21 and the middle column piece 31, the areas of the upper yoke piece 41 and the lower yoke piece 51 are slightly larger than the areas of the left and right column pieces 11, 21 and the middle column piece 31, and the area of the yoke section is slightly larger than the area of the column section), and two positioning holes X are punched on each piece in the cutting process so as to facilitate the positioning of the next process, and a plurality of silicon steel sheets of a first-stage iron core are obtained; arranging a positioning rod capable of penetrating through a positioning hole X on an iron core stacking platform for automatic stacking, stacking multiple silicon steel sheets of a primary iron core by a manipulator or other stacking devices according to the size of a single sheet or a group of multiple sheets at a time from small to large, sequentially arranging the stacked sheets into a left column sheet 11, a right column sheet 21, a middle column sheet 31, an upper yoke sheet 41 and a lower yoke sheet 51 to prepare a primary iron core, wherein the column section and the yoke section of the primary iron core are both a first-stage trapezoid B1 positioned at the bottom of a polygon, as shown in FIG. 3;
secondly, manufacturing a secondary iron core corresponding to a second-stage trapezoid in the column section and the yoke section: longitudinally cutting the silicon steel sheet coiled material at a required angle with the length direction to obtain a second-stage trapezoidal silicon steel sheet strip (not shown in the figure), wherein the width of the small end of the second-stage trapezoidal silicon steel sheet strip is the width of the large end of the first-stage trapezoidal silicon steel sheet strip 200 after the last upper yoke sheet 41 is cut in the first step; sequentially and transversely cutting the second-stage trapezoidal silicon steel strips along the length direction of the second-stage trapezoidal silicon steel strips by taking the small end of the second-stage trapezoidal silicon steel strips as an initial end, wherein the cutting sequence is the same as that in the first step, and two positioning holes X are punched on each strip in the same cutting process so as to facilitate the positioning of the next step, so that a plurality of silicon steel sheets of the second-stage iron core are obtained; a mechanical arm or other laminating devices are used for laminating a plurality of silicon steel sheets of a secondary iron core on the basis of the primary iron core according to the size of a single sheet or a group of a plurality of sheets at a time from small to large (when the sheets are laminated, a positioning hole X on each sheet passes through a positioning rod, so that accurate positioning and lamination can be realized, and the following steps are operated in the same way), the lamination sequence is the same as that in the step one, so that the secondary iron core is prepared, as shown in figure 3, the column section and the yoke section of the secondary iron core are a secondary trapezoid B2 which is positioned above the primary trapezoid B1 and is adjacent to the primary trapezoid B1 (because the width of the starting end of the secondary trapezoid silicon steel strip is the width of the first trapezoid silicon steel strip 200 after the last upper yoke piece 41 is cut, the lengths of the adjacent bottom edges of the secondary trapezoid B2 and the primary trapezoid B1 in the column section and the yoke section are different, and the length of the lower bottom edge of the secondary trapezoid B2 is longer than that of the upper bottom edge of the primary trapezoid B1);
thirdly, manufacturing a three-stage iron core corresponding to a third-stage trapezoid in the column section and the yoke section: longitudinally cutting the silicon steel sheet coiled material at a required angle with the length direction to obtain a third-stage trapezoidal silicon steel sheet strip (not shown in the figure), wherein the width of the small end of the third-stage trapezoidal silicon steel sheet strip is the width of the large end of the second-stage trapezoidal silicon steel sheet strip after the last upper yoke sheet is cut in the step two; sequentially and transversely cutting the third-stage trapezoidal silicon steel strips along the length direction of the third-stage trapezoidal silicon steel strips by taking the small end of each third-stage trapezoidal silicon steel strip as an initial end, wherein the cutting sequence is the same as that in the step one, and two positioning holes X are punched on each silicon steel strip in the cutting process so as to facilitate the positioning of the next process, so that a plurality of silicon steel strips of the third-stage iron core are obtained; a mechanical arm or other lamination devices are used for laminating a plurality of silicon steel sheets of the three-level iron core on the basis of the two-level iron core according to the size from small to large by one sheet or a group of sheets, the lamination sequence is the same as that of the lamination in the step one, and the three-level iron core is manufactured, as shown in fig. 3, the column section and the yoke section of the three-level iron core are a third-level trapezoid B3 which is positioned above the second-level trapezoid B2 and adjacent to the second-level trapezoid B2, and the length of the lower bottom edge of the third-level trapezoid B3 is longer than that of the upper bottom edge of the second-level trapezoid B2;
fourthly, manufacturing four-stage iron cores corresponding to rectangles in the column cross section and the yoke cross section: as shown in fig. 4, the silicon steel sheet coil is longitudinally cut into rectangular silicon steel strips 100, and the width of the rectangular silicon steel strip 100 is the width of the big end of the third-stage trapezoidal silicon steel strip after the last upper yoke sheet is cut in the third step; taking one end of a rectangular silicon steel strip 100 as a starting end, transversely cutting a plurality of left and right column sheets, middle column sheets, upper yoke sheets and lower yoke sheets which are the same in number along the length direction of the rectangular silicon steel strip 100 (because the width of each position of the rectangular silicon steel strip 100 is the same, the cutting sequence of the left and right column sheets, the middle column sheets, the upper yoke sheets and the lower yoke sheets is not required, and the cutting process can be designed according to specific working conditions), punching two positioning holes on each sheet in the cutting process so as to facilitate the positioning of the next working procedure, and obtaining a plurality of silicon steel sheets of a four-level iron core (namely a middle-level iron core); a manipulator or other lamination devices are used for laminating a plurality of silicon steel sheets of the four-level iron core on the basis of the three-level iron core, the lamination sequence is the same as that in the step one, so that the four-level iron core is obtained, the column section and the yoke section of the four-level iron core are the rectangle A, and the length of the rectangle A is longer than that of the upper bottom edge of a third-level trapezoid B2;
fifthly, manufacturing a fifth-stage iron core corresponding to a fifth-stage trapezoid in the column section and the yoke section: longitudinally cutting the silicon steel sheet coiled material at a required angle with the length direction to obtain a fifth-level trapezoidal silicon steel sheet (not shown in the figure) with the same specification as the third-level trapezoidal silicon steel sheet, sequentially and transversely cutting the fifth-level trapezoidal silicon steel sheet along the length direction of the fifth-level trapezoidal silicon steel sheet with the small head end of the fifth-level trapezoidal silicon steel sheet as the starting end, wherein the cutting sequence is the same as that in the step one, and two positioning holes X are punched on each sheet in the cutting process so as to facilitate the positioning of the next process, so that a plurality of silicon steel sheets of the five-level iron core are obtained; a mechanical arm or other laminating devices are used for laminating a plurality of silicon steel sheets of a five-level iron core on the basis of a four-level iron core according to sizes, the silicon steel sheets are laminated in a single sheet or a group of silicon steel sheets at a time from large to small, the lamination sequence is the same as that in the step one, the five-level iron core is manufactured, the column section and the yoke section of the five-level iron core are a fifth-level trapezoid B5 which is positioned above the rectangle A and adjacent to the rectangle A, and the length of the lower bottom edge of the fifth-level trapezoid B5 is smaller than that of the rectangle A;
sixthly, manufacturing a six-stage iron core corresponding to the sixth-stage trapezoid in the column section and the yoke section: longitudinally cutting the silicon steel sheet coiled material at a required angle with the length direction to obtain a sixth-level trapezoidal silicon steel sheet (not shown in the figure) with the same specification as the second-level trapezoidal silicon steel sheet, sequentially and transversely cutting the sixth-level trapezoidal silicon steel sheet along the length direction of the sixth-level trapezoidal silicon steel sheet with the small head end of the sixth-level trapezoidal silicon steel sheet as the starting end, wherein the cutting sequence is the same as that in the step one, and two positioning holes X are punched on each sheet in the cutting process so as to facilitate the positioning of the next process, so that a plurality of silicon steel sheets of a six-level iron core are obtained; a mechanical arm or other lamination devices perform lamination on a plurality of silicon steel sheets of a six-level iron core on the basis of the five-level iron core according to the size of the six-level iron core by one sheet or a group of sheets at a time, the lamination sequence is the same as that of the step I, so that the six-level iron core is prepared, the column section and the yoke section of the six-level iron core are a sixth-level trapezoid B6 which is positioned above the fifth-level trapezoid B5 and adjacent to the fifth-level trapezoid B5, and the length of the lower bottom edge of the sixth-level trapezoid B6 is smaller than that of the upper bottom edge of the fifth-level trapezoid B5;
seventhly, manufacturing a seven-level iron core corresponding to a seventh-level trapezoid in the column section and the yoke section: longitudinally cutting the silicon steel sheet coiled material at a required angle with the length direction to obtain a seventh-level trapezoidal silicon steel sheet 300 (shown in fig. 5) with the same specification as the first-level trapezoidal silicon steel sheet, sequentially and transversely cutting the seventh-level trapezoidal silicon steel sheet 300 along the length direction of the seventh-level trapezoidal silicon steel sheet with the small end of the seventh-level trapezoidal silicon steel sheet 300 as the starting end, wherein the cutting sequence is the same as the cutting sequence in the first step, and two positioning holes are punched on each sheet in the cutting process so as to facilitate the positioning of the next step, so that a plurality of silicon steel sheets of the seventh-level iron core are obtained; a mechanical arm or other lamination devices perform lamination on a plurality of silicon steel sheets of the seven-level iron core on the basis of the six-level iron core according to the size of the silicon steel sheets, the lamination sequence is the same as that in the step one, so that the seven-level iron core is prepared, the column section and the yoke section of the seven-level iron core are a seventh-level trapezoid B7 which is positioned above the sixth-level trapezoid B6 and adjacent to the sixth-level trapezoid B6, and the length of the lower bottom edge of the seventh-level trapezoid B7 is smaller than that of the upper bottom edge of the sixth-level trapezoid B6; thus, the complete laminated transformer core is obtained.
As shown in fig. 6, the transverse cutting adopts a cutting mode of alternating positive and negative knives to improve the utilization rate of the trapezoidal and rectangular silicon steel strips; the left and right column pieces 11 and 21 are cut in sequence, namely, five left column pieces 11 are cut firstly, and five right column pieces 21 are cut later; then cutting five middle column pieces 31; the cutting of the lower and upper yoke pieces 51, 41 is performed in the order of cutting the five lower yoke pieces 51 first and then cutting the five upper yoke pieces 41.
Example 2:
as shown in fig. 7 and 8, a laminated core for a transformer and a method for manufacturing the same according to an embodiment 2 of the present invention have a structure and a method substantially the same as those of the embodiment 1 except that a leg section and a yoke section of the core are inscribed hexadecagon shapes of an ellipse.
As shown in fig. 8, the sequence of cutting the left and right column pieces 11 and 21 in this embodiment is to cut a left column piece 11, then cut a right column piece 21, and then cut a left column piece 11, and so on, and thus the process is repeated to cut five left column pieces 11 and five right column pieces 21; then cutting five middle column pieces 31; the sequence of cutting the lower and upper yoke pieces 51, 41 is to cut a lower yoke piece 51, then cut an upper yoke piece 41, and then cut a lower yoke piece 51, and the above process is repeated to cut five lower yoke pieces 51 and five upper yoke pieces 41.
Example 3:
as shown in fig. 9, example 3, which is a laminated core for a transformer and a method for manufacturing the same according to the present invention, is substantially the same as example 1 except that the cross-section of the leg and the cross-section of the yoke of the core in this example are long inscribed hexadecapegon.
Of course, the laminated transformer core of the present invention is not limited to the structure disclosed in the above embodiments, and the number of the core stages may be increased or decreased according to the design requirement, for example, the laminated transformer core may be a three-stage core structure, a five-stage core structure, a nine-stage core structure, an eleven-stage core structure, a thirteen-stage core structure, and so on.
Claims (7)
1. A transformer laminated iron core comprises columns respectively positioned at the left, right and middle parts and yokes positioned at the upper and lower parts, wherein the column section and the yoke section of the iron core are polygons formed by rectangles and a plurality of levels of trapezoids, the rectangles are positioned in the middle of the polygons, the levels of the trapezoids are positioned at two sides of the long sides of the rectangles, and the bottom sides of the trapezoids at the sides are connected with the long sides of the rectangles after being sequentially connected; the method is characterized in that: the lengths of the adjacent bottom edges of two adjacent stages of trapezoids in the column section and the yoke section are different, and the length of the bottom edge of the trapezoid closer to the rectangle is larger; and the area of the yoke cross section is greater than the area of the column cross section;
the preparation method of the transformer laminated core comprises the following steps:
firstly, manufacturing a first-stage iron core corresponding to a first-stage trapezoid positioned at the bottom of the polygon in the column section and the yoke section: longitudinally cutting the silicon steel sheet coiled material at a required angle with the length direction to obtain a first-stage trapezoidal silicon steel sheet strip; sequentially and transversely cutting the small end of the first-stage trapezoidal silicon steel strip as an initial end along the length direction of the first-stage trapezoidal silicon steel strip, and sequentially cutting the small end into a plurality of left and right column sheets, a middle column sheet, a lower yoke sheet and an upper yoke sheet which are the same in number to obtain a plurality of silicon steel sheets of the first-stage iron core; laminating a plurality of silicon steel sheets of the primary iron core by one sheet or a group of sheets in small and large sizes, wherein the laminated sheets are sequentially a left column sheet, a right column sheet, a middle column sheet, an upper yoke sheet and a lower yoke sheet to obtain the primary iron core;
secondly, manufacturing a secondary iron core corresponding to a second-stage trapezoid in the column section and the yoke section: longitudinally cutting the silicon steel sheet coiled material at a required angle with the length direction to obtain a second-stage trapezoidal silicon steel sheet strip, wherein the width of the small end of the second-stage trapezoidal silicon steel sheet strip is the width of the large end of the first-stage trapezoidal silicon steel sheet strip after the last upper yoke sheet is cut in the step one; sequentially and transversely cutting the second-stage trapezoidal silicon steel strips along the length direction of the second-stage trapezoidal silicon steel strips by taking the small end of the second-stage trapezoidal silicon steel strips as an initial end, wherein the cutting sequence is the same as the cutting sequence in the first step, and a plurality of silicon steel sheets of the second-stage iron core are obtained; laminating a plurality of silicon steel sheets of the secondary iron core on the basis of the primary iron core according to the size of a single sheet or a group of a plurality of sheets at one time from small to large, and sequentially laminating the sheets with the lamination in the first step to obtain the secondary iron core, wherein the column section and the yoke section of the secondary iron core are a second-stage trapezoid which is positioned above and adjacent to the first-stage trapezoid;
thirdly, manufacturing an iron core corresponding to the ladder of the subsequent required stage number positioned on one side of the rectangle in the column section and the yoke section according to the rule of the first step and the second step until an N-stage iron core is obtained, wherein the column section and the yoke section of the N-stage iron core are the Nth-stage ladder which is positioned above the Nth-1-stage ladder and adjacent to the Nth-1-stage ladder; wherein N is a natural number greater than or equal to 2;
fourthly, manufacturing a middle-stage iron core corresponding to the rectangle in the column section and the yoke section: longitudinally cutting rectangular silicon steel sheet strips on the silicon steel sheet coiled material according to the size of the transformer laminated iron core; the width of the rectangular silicon steel strip is the width of the big end of the Nth-level trapezoidal silicon steel strip after the last yoke piece in the N-level iron cores is cut in the third step; transversely cutting a plurality of left and right column sheets, middle column sheets, upper yoke sheets and lower yoke sheets which are the same in number along the length direction of the rectangular silicon steel strip by taking one end of the rectangular silicon steel strip as an initial end to obtain a plurality of silicon steel sheets of the middle-level iron core; laminating a plurality of silicon steel sheets of the middle-level iron core one sheet at a time or one group of a plurality of sheets on the basis of the N-level iron core prepared in the third step, wherein the lamination sequence is the same as that in the first step to prepare the middle-level iron core, namely the N + 1-level iron core;
fifthly, manufacturing an N + 2-stage iron core corresponding to the N + 2-stage trapezoid positioned on the other side of the rectangle in the column section and the yoke section: longitudinally cutting the silicon steel sheet coiled material at a required angle with the length direction to obtain an N +2 th-level trapezoidal silicon steel sheet strip with the same specification as the nth-level trapezoidal silicon steel sheet strip, sequentially and transversely cutting the nth +2 th-level trapezoidal silicon steel sheet strip along the length direction of the N +2 th-level trapezoidal silicon steel sheet strip by taking the small head end of the nth +2 th-level trapezoidal silicon steel sheet strip as the starting end, and sequentially cutting the nth +2 th-level trapezoidal silicon steel sheet strip in the same cutting sequence in the first step to obtain a plurality of silicon steel sheets of the N + 2-level iron core; laminating a plurality of silicon steel sheets of the N + 2-level iron core on the basis of the N + 1-level iron core according to the size of the iron core, wherein the size of the silicon steel sheets is changed from large to small, and the lamination sequence is the same as that of the lamination sequence in the step one, so that the N + 2-level iron core is obtained;
sixthly, manufacturing an N + 3-level iron core corresponding to the N + 3-level trapezoid positioned on the other side of the rectangle in the column section and the yoke section: longitudinally cutting the silicon steel sheet coiled material at a required angle with the length direction to obtain an N +3 th-level trapezoidal silicon steel sheet strip with the same specification as the N-1 st-level trapezoidal silicon steel sheet strip, sequentially and transversely cutting the small end of the N +3 th-level trapezoidal silicon steel sheet strip along the length direction of the N +3 th-level trapezoidal silicon steel sheet strip by taking the small end of the N +3 th-level trapezoidal silicon steel sheet strip as an initial end, and sequentially cutting the silicon steel sheet strip in the same manner as the cutting in the first step to obtain a plurality of silicon steel sheets of the N + 3-level iron core; laminating a plurality of silicon steel sheets of the N + 3-level iron core on the basis of the N + 2-level iron core according to the size by one sheet or a group of sheets at a time, wherein the lamination sequence is the same as that in the step I to prepare the N + 3-level iron core, and the column section and the yoke section of the N + 3-level iron core are an N + 3-level trapezoid which is positioned above the N + 2-level trapezoid and is adjacent to the N + 2-level trapezoid;
seventhly, manufacturing the iron core corresponding to the trapezoid of the column section and the yoke section, which are positioned on the other side of the rectangle and have the required subsequent stages, according to the rule of the fifth step and the sixth step until a 2N + 1-stage iron core is obtained, namely manufacturing the complete transformer laminated iron core, wherein the column section and the yoke section of the 2N + 1-stage iron core are 2N + 1-stage trapezoids which are positioned above the 2N-stage trapezoids and adjacent to the 2N-stage trapezoids;
the transverse cutting adopts a cutting mode that a positive and negative knife forming a required angle with the length direction is alternated.
2. A laminated core for a transformer according to claim 1, wherein: the cross section of the iron core and the cross section of the yoke are inscribed polygons of circles, long circles or ellipses.
3. A laminated core for a transformer according to claim 1, wherein: the iron core is of a three-phase three-column structure.
4. A laminated core for a transformer according to claim 1, wherein: the trapezoidal silicon steel sheet strips with the same specification can be cut in a suit mode after silicon steel sheet coiled materials are stacked up and down.
5. A laminated core for a transformer according to claim 1, wherein: the iron core stacking platform is characterized in that the silicon steel sheets are stacked on the iron core stacking platform, at least one positioning hole is formed in each silicon steel sheet, and a positioning rod which can penetrate through the positioning holes and can be used for positioning and stacking the silicon steel sheets is arranged on the iron core stacking platform in a protruding mode.
6. A laminated core for a transformer according to claim 1, wherein: the left and right column pieces are cut in sequence, namely, at least three left column pieces are cut first, and then the right column pieces with the same number as the left column pieces are cut; or cutting a left column piece, then cutting a right column piece, and then cutting a left column piece, and repeating the steps to cut at least three left column pieces and right column pieces with the same number as the left column pieces; and then cutting at least three middle column sheets.
7. The laminated core for a transformer as recited in claim 6, wherein: the lower yoke sheets and the upper yoke sheets are cut sequentially, namely a plurality of lower yoke sheets with the same number as that of the left column sheets are cut first, and a plurality of upper yoke sheets with the same number as that of the lower yoke sheets are cut later; or cutting a lower yoke piece, then cutting an upper yoke piece, and then cutting a lower yoke piece, and repeating the steps to cut the lower yoke pieces with the same number as the left column pieces and the upper yoke pieces with the same number as the lower yoke pieces.
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| CN201811332011.4A CN109346289B (en) | 2018-11-09 | 2018-11-09 | Transformer laminated core and preparation method thereof |
| PCT/CN2019/071111 WO2020093589A1 (en) | 2018-11-09 | 2019-01-10 | Transformer laminated core and preparation method therefor |
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| CN201811332011.4A CN109346289B (en) | 2018-11-09 | 2018-11-09 | Transformer laminated core and preparation method thereof |
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| CN110459385B (en) * | 2019-08-19 | 2024-08-09 | 梁友国 | Transformer and iron core thereof |
| CN112309705B (en) * | 2020-11-04 | 2024-05-24 | 武汉科技大学 | Pushing device for stacking silicon steel sheets of transformer iron cores |
| CN113539635B (en) * | 2021-07-20 | 2024-07-02 | 无锡普天铁心股份有限公司 | Compression device and iron core compression method for transformer |
| CN113990627A (en) * | 2021-09-27 | 2022-01-28 | 重庆泰昇智能电气有限公司 | Iron core and lamination tool and lamination method thereof |
| CN114023539B (en) * | 2021-11-03 | 2023-04-07 | 无锡普天铁心股份有限公司 | Method capable of saving transformer core material |
| CN115762997A (en) * | 2022-11-16 | 2023-03-07 | 吴江变压器有限公司 | Three-stage stepped iron core dry-type distribution transformer |
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| CN201788818U (en) * | 2010-09-21 | 2011-04-06 | 董振华 | Transformer silicon sheet steel processing stacking device and its stacking apparatus |
| CN205406251U (en) * | 2016-02-24 | 2016-07-27 | 广州银变电力设备有限公司 | Low loss transformer iron core structure |
| CN107658110A (en) * | 2017-10-20 | 2018-02-02 | 特变电工股份有限公司 | A kind of core structure and its shearing, assembly method for improving iron core filling rate |
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| CN202102842U (en) * | 2010-12-30 | 2012-01-04 | 天威云南变压器股份有限公司 | Transformer and transformer core |
| EP3018664B1 (en) * | 2014-11-06 | 2020-06-17 | Siemens Aktiengesellschaft | Magnetic core for an an electrical induction device |
| CN207611666U (en) * | 2017-10-20 | 2018-07-13 | 特变电工股份有限公司 | A kind of core structure improving iron core filling rate |
| CN207719017U (en) * | 2017-10-20 | 2018-08-10 | 特变电工沈阳变压器集团有限公司 | Three-phase solid laminated core structure |
| CN108257767A (en) * | 2017-12-15 | 2018-07-06 | 保定保菱变压器有限公司 | A kind of transformer iron-core structure and power transformer |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201788818U (en) * | 2010-09-21 | 2011-04-06 | 董振华 | Transformer silicon sheet steel processing stacking device and its stacking apparatus |
| CN205406251U (en) * | 2016-02-24 | 2016-07-27 | 广州银变电力设备有限公司 | Low loss transformer iron core structure |
| CN107658110A (en) * | 2017-10-20 | 2018-02-02 | 特变电工股份有限公司 | A kind of core structure and its shearing, assembly method for improving iron core filling rate |
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