Iron core plate, iron core and design method

Abstract

The invention belongs to the technical field of transformers, and discloses an iron core piece, an iron core and a design method, the iron core piece comprises an iron yoke piece, a core column piece and a side column piece, the end parts of the inner edges of two core columns on the same side are connected with a core column beveled edge, and the end parts of the two core column beveled edges on the same side are connected; the same sides of the side column outer edge and the side column inner edge are connected through a side column inclined connection edge; the sides, close to the side column sheet, of the yoke inner edge and the yoke outer edge are connected through a first yoke oblique connection edge, and the other sides are connected through a second yoke oblique connection edge; the included angle between the side column beveled edge and the side column outer edge connected with the side column beveled edge is greater than 45 degrees; the included angle between the second iron yoke miter joint edge and the iron yoke inner edge is smaller than 135 degrees. Differentiated shearing angle design is adopted for the iron yoke and the side columns, by changing the shearing angles, it is guaranteed that the utilization rate of the iron core pieces is not changed, the width of the iron yoke pieces is increased, the filling coefficient is increased, the magnetic density of the joints is reduced by increasing the lengths of the joints, and meanwhile the magnetic density of the iron yoke and the magnetic density of the side columns are reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of transformers, and in particular relates to an iron core sheet, an iron core and a design method. Background Art

[0002] The iron core is the magnetic circuit and skeleton of the transformer, converting the transformer's primary electrical energy into magnetic energy, and then from magnetic energy into secondary electrical energy. Cold-rolled silicon steel sheets have excellent magnetic conductivity, requiring a lower magnetic field strength H to achieve the same magnetic flux density B, thereby reducing no-load current and losses. In recent years, improvements in silicon steel sheet performance, developments in core structure, and advancements in manufacturing processes have significantly reduced transformer no-load losses, playing a significant role in reducing transformer losses. The yoke and side legs of the transformer core are now mostly made of silicon steel sheets cut at 45° and stacked with fully beveled seams.

[0003] The Chinese patent application, CN201444441U, is titled "On-load tap-changing oil-immersed power transformer." The device comprises an iron core, low-voltage coil, high-voltage coil, oil tank, cooling device, insulation device, and voltage regulating and protection devices. The iron core utilizes four levels of 45° fully beveled joints; a layer of oil-resistant rubber is applied at regular intervals between the core laminations; synthetic insulating paperboard strips fill the gap between the core's main stages and the paper tube; the low-voltage coil's internal bracing has been doubled, and external bracing has been added; the first and last turns of the low-voltage coil are flattened; the high-voltage regulating coil utilizes an eight-helix design, eliminating the need for transposition; the wires are tensioned during coil winding; the cooling device utilizes a naturally cooled radiator; and all core components, insulation components, and lead components have rounded corners. The patent application still utilizes 45° beveled joints, which fails to address the high no-load losses of the iron core. Summary of the Invention

[0004] In order to overcome the problems existing in the above-mentioned prior art, the purpose of the present invention is to provide a core sheet, a core and a design method, which can ensure the utilization rate of the core sheet remains unchanged by changing the shear angle of the core sheet, reduce the idle loss, and reduce the core diameter.

[0005] To achieve the above object, the technical solution adopted by the present invention is: In the first aspect, the present invention provides an iron core sheet, comprising an iron yoke sheet, a core column sheet and a side column sheet, wherein the core column sheet is connected to the side column sheet through the iron yoke sheet; the core column sheet comprises two core column inner edges, the ends of the two core column inner edges on the same side are connected to a core column bevel edge, and the ends of the two core column bevel edges on the same side are connected; the side column sheet comprises a side column outer edge and a side column inner edge; the side column outer edge and the same side of the side column inner edge are connected by the side column bevel edge; the iron yoke sheet comprises an iron yoke inner edge and an iron yoke outer edge; the iron yoke inner edge and the iron yoke outer edge are connected by the first iron yoke bevel edge on one side close to the side column sheet, and are connected by the second iron yoke bevel edge on the other side; the angle between the side column bevel edge and the side column outer edge connected thereto is greater than 45°; the angle between the second iron yoke bevel edge and the iron yoke inner edge is less than 135°.

[0006] Optionally, the angle between the inner edge of the core column and the adjacent mitered edge of the core column is greater than 135°; and the angle between the first mitered edge of the iron yoke and the outer edge of the iron yoke is less than 45°.

[0007] Optionally, the inner edges of the two core columns are parallel to each other; the outer edges of the side columns and the inner edges of the side columns are parallel to each other; the inner edge of the iron yoke and the outer edge of the iron yoke are parallel to each other; the outer edge of the iron yoke is perpendicular to the outer edges of the side columns; the inner edge of the iron yoke is perpendicular to the inner edge of the core column, and the inner edge of the iron yoke is perpendicular to the inner edge of the side columns.

[0008] Optionally, the side column miter edge has the same length as the first miter edge of the iron yoke, and the core column miter edge has the same length as the second miter edge of the iron yoke.

[0009] Optionally, each second miter edge of the iron yoke at both ends of the core piece is connected to an iron yoke piece, and a side column piece is connected between the two iron yoke pieces on the same side.

[0010] In the second aspect, the present invention provides an iron core, comprising multiple layers of the above-mentioned iron core sheets; the multiple layers of iron core sheets are stacked; the iron core comprises an iron yoke formed by stacking multiple layers of the above-mentioned iron yoke sheets, a core column formed by stacking multiple layers of the above-mentioned core column sheets, and a side column formed by stacking multiple layers of the above-mentioned side column sheets.

[0011] Optionally, the widths of the multiple layers of iron yoke sheets, the multiple layers of core column sheets, and the multiple layers of side column sheets decrease gradually from the inside to both sides.

[0012] Optionally, both the core column and the side columns are wrapped with a non-weft glass fiber adhesive tape.

[0013] In a third aspect, the present invention provides a method for designing an iron core, based on the iron core, comprising the following steps: Calculating the diameter of the core column based on the capacity; Calculating the magnetic density of the core column according to the diameter of the core column; Calculating the maximum overall magnetic density of the iron yoke and the side columns based on the overall required magnetic density and the magnetic density of the core column; The angle between the miter edge of the iron yoke and the side pillar and the outer edge of the side pillar connected thereto is designed to be greater than 45°, and the angle between the inner edge of the core pillar and the miter edge of the core pillar connected thereto is designed to be greater than 135°, so that the cross-sectional area of ​​the iron yoke and the side pillar is increased and the overall magnetic density of the iron yoke and the side pillar is less than or equal to the maximum overall magnetic density.

[0014] Optionally, the calculation formulas for the sheet width of the iron yoke sheet, the sheet width of the core sheet, and the sheet width of the side column sheet are: B1=2B2tanθ1 B3=B1tanθ2 Among them, θ1 is the angle obtained by subtracting the angle between the second miter edge of the iron yoke and the inner edge of the iron yoke from 180°; θ2 is the angle between the miter edge of the side column and the outer edge of the side column connected to it; B1 is the sheet width of the iron yoke sheet; B2 is the sheet width of the core column sheet; B3 is the sheet width of the side column sheet.

[0015] Compared with the prior art, the present invention has the following beneficial effects: Under the conditions of a given core diameter, the larger the core cross-sectional area, the higher the filling factor and the better the economic indicators of the transformer, the core diameter remains unchanged, the iron yoke increases, and the window height and oil tank size remain unchanged. The joint magnetic density can be reduced by increasing the length of the joint, and the cavity is smaller. Reducing the number of coil turns under high energy efficiency can reduce the core no-load loss.

[0016] The present invention employs a differentiated shear angle design for the yoke and side legs. By varying the shear angle, the utilization rate of the core laminations remains unchanged, the yoke width is increased, and the fill factor is improved. The length of the joint is increased to reduce the magnetic flux density at the joint, while also reducing the magnetic flux density of the yoke and side legs. This significantly reduces the core diameter, coil turns, and inner diameter, and reduces the core's no-load losses, while meeting high energy efficiency requirements. This is an effective and cost-effective measure to reduce transformer losses, resulting in economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the components in the drawings are only schematic and are used to help understand the present invention, and are not intended to specifically limit the shapes and proportional dimensions of the components of the present invention. In the drawings: Figure 1 Schematic diagram of the core of embodiment 1 of the present invention; Figure 2Schematic diagram of the core sheet of Example 1 of the present invention; Figure 3 This is a schematic diagram of the core sheets after the angle is changed according to embodiment 1 of the present invention; Figure 4 This is a schematic diagram of magnetic density before changing the cross-sectional angles of the iron yoke and the side pillars in Example 3 of the present invention; Figure 5 This is a schematic diagram of magnetic density after changing the cross-sectional angles of the iron yoke and the side pillars in Example 3 of the present invention; Figure 6 This is a schematic cross-sectional view of a core column according to Example 4 of the present invention; Figure 7 This is a schematic cross-sectional view of the iron yoke after the angle is changed according to Example 4 of the present invention; Figure 8 This is a schematic cross-sectional view of a side pillar after changing the angle according to Example 4 of the present invention; Among them, 1. iron yoke; 2. non-woven glass fiber adhesive tape; 3. core column; 4. side column; 100, iron yoke piece; 11. first mitered edge of iron yoke; 12. second mitered edge of iron yoke; 13. inner edge of iron yoke; 14. outer edge of iron yoke; 300, core piece; 31, core inner edge; 32, core mitered edge; 400, side column piece; 41, side column mitered edge; 42, side column outer edge; 43, side column inner edge. DETAILED DESCRIPTION

[0018] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0019] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0020] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the invention is usually placed when in use. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0021] When an element is referred to as being "disposed on" another element, it may be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may also be an intermediate element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiments. If the term "horizontal" appears, it does not mean that the component is required to be absolutely horizontal, but it can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and it does not mean that the structure must be completely horizontal, but it can be slightly tilted.

[0022] It should be noted that similar reference numerals and letters denote similar items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined or explained in subsequent figures. In the description of the present invention, it should be understood that the terms "comprise" and "include" indicate the presence of the described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or their combinations.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present invention pertains. The terms used herein in the specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0024] The present invention will be described in detail below with reference to the accompanying drawings.

[0025] The present invention provides an iron core sheet, comprising an iron yoke sheet 100, a core sheet 300 and a side column sheet 400. The core sheet 300 is connected to the side column sheet 400 through the iron yoke sheet 100. The core sheet 300 includes two core inner edges 31, the ends of the two core inner edges 31 on the same side are connected to a core mitered edge 32, and the ends of the two core mitered edges 32 on the same side are connected. The side column sheet 400 includes a side column outer edge 42 and a side column inner edge 43. The side column outer edge 42 and the side column inner edge 43 are connected to each other. The same side of the edge 43 is connected by the side pillar bevel edge 41; the iron yoke piece 100 includes an iron yoke inner edge 13 and an iron yoke outer edge 14; the iron yoke inner edge 13 and the iron yoke outer edge 14 are connected on one side close to the side pillar piece 400 by the iron yoke first bevel edge 11, and on the other side by the iron yoke second bevel edge 12; the angle between the side pillar bevel edge 41 and the side pillar outer edge 42 connected thereto is greater than 45°; the angle between the iron yoke second bevel edge 12 and the iron yoke inner edge 13 is less than 135°.

[0026] The yoke 1 and side legs 4 of the present invention utilize differentiated shear angles. By varying the shear angles, the utilization rate of the core laminations remains unchanged, the yoke 1's width is increased, the fill factor is improved, and the length of the joint is increased to reduce the magnetic flux density at the joint, thereby reducing the magnetic flux density of the yoke 1 and side legs 4. This significantly reduces the core diameter, coil turns, and inner diameter, and reduces the core's no-load losses, while meeting high energy efficiency requirements. This is an effective and cost-effective measure to reduce transformer losses, resulting in economic benefits.

[0027] Example 1 like Figure 1 As shown, an iron core of this embodiment includes a core column 3, and iron yokes 1 are connected to both sides of the top and bottom of the core column 3. The ends of the iron yokes 1 on the same side away from the core column 3 are connected by side columns 4.

[0028] Specifically, the side pillars 4, the core pillar 3 and the iron yoke 1 all include a plurality of laminated sheets whose cross-sectional areas gradually decrease from the middle to both sides.

[0029] The side pillars 4 include a plurality of side pillar pieces 400 stacked in parallel; the core pillar 3 includes a plurality of core pillar pieces 300 stacked in parallel; and the iron yoke 1 includes a plurality of iron yoke pieces 100 stacked in parallel.

[0030] The side column piece 400 and the iron yoke piece 100 as well as the core column piece 300 and the iron yoke piece 100 are connected by stacking with oblique seams.

[0031] The top and bottom of the stem piece 300 both have stem bevel edges 32 ; the top and bottom stem bevel edges 32 are both connected to the side pillar piece 400 via the iron yoke piece 100 .

[0032] Specifically, the central portion of the stem piece 300 is rectangular, with two triangles integrally connected to the two short sides of the rectangle. The edges connecting the two triangles to the rectangle are the same length as the short sides of the rectangle. The central portion of the stem piece 300 is formed by two parallel and equal-length stem inner edges 31. The ends of the two stem inner edges 31 on the same side are connected by two stem miter edges 32.

[0033] The edge where the side pillar piece 400 and the iron yoke piece 100 meet is the side pillar bevel edge 41 .

[0034] The top and bottom of the side pillar piece 400 both have a side pillar bevel edge 41 , and the end of the side pillar bevel edge 41 close to the iron yoke piece 100 is the side pillar inner edge 43 , and the end away from the iron yoke piece 100 is the side pillar outer edge 42 .

[0035] Specifically, the iron yoke piece 100 is in a trapezoidal shape, wherein the side of the iron yoke piece 100 that meets the inner side 43 of the side pillar is the iron yoke inner side 13 , and the side of the iron yoke piece 100 that meets the outer side 42 of the side pillar is the iron yoke outer side 14 .

[0036] The inner edge 13 and the outer edge 14 of the iron yoke are connected by the first mitered edge 11 of the iron yoke near the side column piece 400 ; the inner edge 13 and the outer edge 14 of the iron yoke are connected by the second mitered edge 12 of the iron yoke near the core column piece 300 .

[0037] like Figure 2 As shown, the angle between the extension line of the inner edge 13 of the iron yoke toward the mitered edge 32 of the core and the mitered edge 32 of the core is a first angle θ1, and the first angle θ1 is greater than 45°. That is, the angle between the adjacent inner edges 31 of the core and the mitered edge 32 of the core is greater than 135°.

[0038] like Figure 2 As shown, the included angle between the side pillar miter edge 41 and the side pillar outer edge 42, that is, the bottom angle of the trapezoidal side pillar piece 400 is a second included angle θ2, and the second included angle θ2 is greater than 45°.

[0039] The end of the iron yoke piece 100 that is connected to the side pillar piece 400 is the iron yoke first bevel edge 11. The end of the iron yoke piece 100 that is connected to the core pillar bevel edge 32 is the iron yoke second bevel edge 12.

[0040] The inner edge 13 of the iron yoke is parallel to the outer edge 14 of the iron yoke.

[0041] Specifically, the angle between the mutually beveled side column beveled edge 41 and the first beveled edge 11 of the iron yoke is 0°.

[0042] Specifically, the angle between the second beveled edge 12 of the iron yoke and the beveled edge 32 of the core column that are beveled to each other is 0°.

[0043] Specifically, the angle between the adjacent inner edges of the iron yoke 13 and the inner edges of the side pillars 43 is 90°.

[0044] Specifically, the included angle between the adjacent outer edges of the iron yoke 14 and the outer edges of the side pillars 42 is 90°.

[0045] Specifically, the angle between the stem inner edge 31 and the yoke inner edge 13 is 90°. The two yoke inner edges 13 of the yoke pieces 100 at the top and bottom of the stem piece 300, the stem inner edge 31 and the side pillar inner edge 43 form a rectangular frame.

[0046] Specifically, the angle between the two second miter edges 12 of the iron yoke on the same side and the two adjacent outer edges 14 of the iron yoke is 180°.

[0047] The core of this embodiment includes a plurality of stacked core sheets, including a yoke 1 formed by stacking a plurality of yoke sheets 100 , a core 3 formed by stacking a plurality of core sheets 300 , and a side 4 formed by stacking a plurality of side 400 sheets.

[0048] In this embodiment, high-permeability grain-oriented cold-rolled silicon steel sheets are used to manufacture the iron yoke 1, the core limb 3 and the side limb 4 through a lamination process, which serve as the internal skeleton structure of the transformer.

[0049] In this embodiment, the iron yoke 1, the core column 3 and the side column 4 are manufactured using a cold-rolled silicon steel strip with a magnetic domain orientation degree of ≥98%.

[0050] In this embodiment, a magnetic domain continuity maintenance process is adopted to achieve a grain orientation consistency of ≥95% in the iron yoke 1, the core column 3 and the side column 4.

[0051] In this embodiment, the thickness gradient distribution of the lamination units of the core sheets satisfies Δh≤0.02 mm, where Δh is the lamination spacing.

[0052] Optionally, in this embodiment, the lamination joint misalignment tolerance of the core sheets is ≤0.05mm, and the stacking angle deviation is <±0.3°. Optionally, in this embodiment, the insulation resistance between lamination layers of the core sheets is ≥100 MΩ.

[0053] Optionally, in this embodiment, the width of the core sheets of each level of the core column 3 , the iron yoke 1 and the side column 4 decreases piece by piece from the inside to the two sides.

[0054] Optionally, in this embodiment, the iron yoke 1 and the side column 4 are elliptical or circular, and the number of stages is the same as that of the core column 3, and can be used for a single-phase three-column core, a three-phase five-column core, and a three-phase three-column core.

[0055] Example 2 A method for designing an iron core according to this embodiment includes the following steps: First, the diameter of the core column 3 is calculated based on the capacity. When the diameter of the core column 3 is determined, the cross-section of the iron yoke 1 is enlarged by changing the angle.

[0056] According to the determined diameter of the core 3 , the magnetic density of the core 3 is calculated.

[0057] The overall magnetic density of the iron yoke 1 and the side columns 4 is calculated based on the overall required magnetic density and the magnetic density of the core column 3 .

[0058] The magnetic flux density of the core 3 changes according to its diameter. It can be seen that as the diameter of the core 3 decreases, the magnetic flux density of the core 3 increases and the no-load loss increases.

[0059] Therefore, the no-load loss is ensured by reducing the magnetic density of the iron yoke 1 and the side column 4 and increasing the cross-section by changing the angle.

[0060] Example 3 In this embodiment, by dynamically adjusting the coupling relationship between the shear angle α and the width W of the iron yoke 100 (∂W / ∂α≥0.25mm / °), an increase in the effective magnetic circuit area of ​​the iron yoke 1 of ≥30% and a uniformity coefficient of magnetic flux density distribution of ≥0.92 are achieved.

[0061] The sheet width B1 of the iron yoke sheet 100, the sheet width B2 of the core sheet 300, and the sheet width B3 of the side column sheet 400 are related by the following expression: B1=2B2tanθ1 B3=B1tanθ2 (θ1, θ2>45°) The width xi of each level of core lamination, the thickness ti of each level of core lamination and the cross-sectional area A total There is the following expression relationship between them:

[0062] By increasing the magnetic flux density of the core 3, the core and coil sizes can be reduced.

[0063] By establishing the shear angle-magnetic flux density mapping relationship B=f(θ, k), the working magnetic flux density of core column 3 is increased to 1.72~1.85T, and the overall volume is reduced by 35%~40%.

[0064] Among them, f(θ,k) satisfies (Magnetic field density increases monotonically with angle); k∈[0.8,1.2] (effective range of material coefficient). B is the magnetic field density, k is the material coefficient, and θ is the shear angle (i.e., the second angle θ2).

[0065] According to the formula , assuming the main magnetic flux in the iron core is ; The electromotive force induced by the main magnetic flux in the winding is: .

[0066] We can get: .

[0067] Magnetic flux of core 3 = k 铁轭* Total magnetic flux.

[0068] For a single-phase three-pole transformer, k=0.5, for a three-phase three-pole transformer, k=1, and for a three-phase five-pole transformer, k is between 0.4-0.6, determined by the area of ​​the main yoke and the side yoke. By reducing the magnetic flux density of the iron yoke 1 and the side yoke 4, no-load loss and noise are minimized.

[0069] The working magnetic flux density of the iron yoke 1 is controlled within the range of 1.72 to 1.85 T through the magnetic circuit balance equation Σ(Bi·Si)=C.

[0070] Where Bi is the local magnetic induction intensity, Si is the effective cross-sectional area, and C is a constant.

[0071] The no-load loss is reduced by 15%~20% and the noise sound pressure level is reduced by 5~8dB.

[0072] According to the formula:

[0073] Among them, P1.7 is the unit loss of silicon steel sheet at 1.7T / 50Hz (W / kg, such as 0.85W / kg for 23ZH100).

[0074] β is the magnetic density correction index (1.8~2.2); γ is the frequency correction index (1.0~1.5).

[0075] The magnetic flux density β and unit volume loss P of the core o According to the measured BP curve of the corresponding silicon steel sheet material, the no-load loss Ptotal of the core can be calculated based on the core volume V.

[0076] For the noise level of the transformer, L body = L1 + L2 + L3 + L4 + L5 + L6 L: transformer noise, L1: core weight factor noise, L2: magnetic flux density factor, L3: frequency factor, L4: core material factor, L5: core joint factor, L6: core binding factor; all units are dB.

[0077] By adjusting the cross-sectional areas of the iron yoke 1 and the side legs 4, the transformer noise L1 and L2 will be reduced according to the relevant influencing factors of the iron core weight and the magnetic flux density.

[0078] After the core is tightened with clevis, two pairs of cores are tied with non-woven glass fiber adhesive tape to reduce L6 noise. During the manufacturing process, a stepped full-slant step-lap joint method is used to reduce L5 noise.

[0079] In this embodiment, the core is clamped by a clamp to ensure the integrity and firmness of the core structure. A prestressed distributed clamping system is used, and its technical indicators include: axial pressure gradient: 200~150N / cm 2 Linear decreasing structure deformation suppression rate ≥ 92% Vibration displacement ≤ 0.01mm 2 .

[0080] By adopting a core column 3 with a small cross section and high magnetic density, the number of turns and the inner diameter of the coil can be effectively reduced.

[0081] The no-load loss of the core column 3 increases, while the iron yoke 1 and the side column 4 greatly reduce the no-load loss by increasing the cross-sectional area, thereby reducing the no-load loss of the transformer. This is an effective measure to reduce the loss level of the transformer at a low cost.

[0082] By adjusting the first angle θ1 and the second angle θ2, the width of the iron yoke 1 and the side column 4 is made larger, the absorption cross-sectional area is large, and the silicon steel sheets are stacked using the oblique seam stacking method.

[0083] After tightening the horns, use item 2 to tie the core, and then use the clamps to clamp the core to ensure the integrity and firmness of the core structure.

[0084] like Figure 4 and Figure 5 As shown, before the cross-section of the iron yoke 1 and the side column 4 is changed, the magnetic density of the core column 3 is 1.68T; after the cross-section of the iron yoke 1 and the side column 4 is changed, the magnetic density of the core column 3 is 1.76T.

[0085] Example 4 In this embodiment, the diameter of the core is 700 mm, and the cross section of the core column 3 is as follows: Figure 6 shown.

[0086] As an implementation method of this embodiment, when the first angle θ1=50°, the present invention can be used to achieve Figure 7 The cross section of the iron yoke 1, when the second angle θ2 = 50 °, can be achieved by using the present invention. Figure 8 The cross section of the side column 4. The thickness of each level of lamination remains unchanged. The width of each level calculated for the core column 300, the iron yoke 100 and the side column 400 is shown in Table 1 below.

[0087] Table 1

[0088] Unless otherwise specified, the device components involved in the above embodiments are all conventional device components, and the structural settings, working modes or control modes involved are all conventional settings, working modes or control modes in the art unless otherwise specified.

[0089] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention and are not limiting. Other modifications or equivalent substitutions made to the technical solution of the present invention by ordinary technicians in this field should be included in the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solution of the present invention.

Claims

1. A core sheet, characterized in that: The invention comprises an iron yoke piece (100), a core piece (300) and a side column piece (400), wherein the core piece (300) is connected to the side column piece (400) via the iron yoke piece (100); the core piece (300) comprises two core inner edges (31), the ends of the two core inner edges (31) on the same side are connected to a core mitered edge (32), and the ends of the two core mitered edges (32) on the same side are connected; the side column piece (400) comprises a side column outer edge (42) and a side column inner edge (43); the side column outer edge (42) and the side column inner edge (43) are connected to each other. The same side is connected by a mitered edge (41) of a side column; the iron yoke piece (100) includes an inner edge (13) of an iron yoke and an outer edge (14) of an iron yoke; the inner edge (13) of the iron yoke and the outer edge (14) of the iron yoke are connected by a first mitered edge (11) of the iron yoke on one side close to the side column piece (400), and are connected by a second mitered edge (12) of the iron yoke on the other side; the angle between the mitered edge (41) of the side column and the outer edge (42) of the side column connected thereto is greater than 45°; the angle between the second mitered edge (12) of the iron yoke and the inner edge (13) of the iron yoke is less than 135°.

2. The core sheet according to claim 1, wherein: The angle between the inner edge (31) of the core column and the adjacent mitered edge (32) of the core column is greater than 135°; and the angle between the first mitered edge (11) of the iron yoke and the outer edge (14) of the iron yoke is less than 45°.

3. The core sheet according to claim 1, wherein: The two inner edges of the core column (31) are parallel to each other; the outer edge of the side column (42) and the inner edge of the side column (43) are parallel to each other; the inner edge of the iron yoke (13) and the outer edge of the iron yoke (14) are parallel to each other; the outer edge of the iron yoke (14) is perpendicular to the outer edge of the side column (42); the inner edge of the iron yoke (13) is perpendicular to the inner edge of the core column (31), and the inner edge of the iron yoke (13) is perpendicular to the inner edge of the side column (43).

4. The core sheet according to claim 1, wherein: The side column bevel edge (41) is the same length as the first bevel edge (11) of the iron yoke, and the core column bevel edge (32) is the same length as the second bevel edge (12) of the iron yoke.

5. The core sheet according to claim 1, wherein: Each second mitered edge (12) of the iron yoke at both ends of the core piece (300) is connected to an iron yoke piece (100), and a side column piece (400) is connected between the two iron yoke pieces (100) on the same side.

6. An iron core, characterized in that: The invention comprises a plurality of iron core sheets according to any one of claims 1 to 5; the plurality of iron core sheets are stacked; the iron core comprises an iron yoke (1) formed by stacking a plurality of iron yoke sheets (100), a core column (3) formed by stacking a plurality of core column sheets (300), and a side column (4) formed by stacking a plurality of side column sheets (400).

7. The core according to claim 6, characterized in that: The widths of the multiple layers of iron yoke sheets (100), the multiple layers of core column sheets (300), and the multiple layers of side column sheets (400) decrease piece by piece from the inside to both sides.

8. The core according to claim 6, characterized in that: The core column (3) and the side column (4) are both wrapped with a non-weft glass fiber adhesive tape (2).

9. A method for designing an iron core, based on the iron core according to any one of claims 6 to 8, characterized in that: The following steps are involved: The diameter of the core column (3) is obtained according to the capacity calculation; Calculating the magnetic density of the core column (3) based on the diameter of the core column (3); The maximum overall magnetic density of the iron yoke (1) and the side column (4) is calculated based on the overall required magnetic density and the magnetic density of the core column (3); The angle between the side column bevel edge (41) and the side column outer edge (42) connected thereto in the iron yoke (1) and the side column (4) is designed to be greater than 45°, and the angle between the core column inner edge (31) and the core column bevel edge (32) connected thereto is designed to be greater than 135°, so that the cross-sectional area of ​​the iron yoke (1) and the side column (4) is increased, and the overall magnetic density of the iron yoke (1) and the side column (4) is less than or equal to the maximum overall magnetic density.

10. The method for designing an iron core according to claim 9, wherein: The calculation formulas for the sheet width of the iron yoke sheet (100), the sheet width of the core sheet (300), and the sheet width of the side column sheet (400) are: B1=2B2tanθ1 B3=B1tanθ2 Wherein, θ1 is the angle obtained by subtracting the included angle between the second mitered edge (12) of the iron yoke and the inner edge (13) of the iron yoke from 180°; θ2 is the included angle between the mitered edge (41) of the side column and the outer edge (42) of the side column connected thereto; B1 is the sheet width of the iron yoke sheet (100); B2 is the sheet width of the core column sheet (300); and B3 is the sheet width of the side column sheet (400).

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