WO2017214973A1

WO2017214973A1 - Three-phase three-dimensional fracture-type wound iron core and transformer

Info

Publication number: WO2017214973A1
Application number: PCT/CN2016/086182
Authority: WO
Inventors: 宋辉; 孟杰; 李忠; 房玉杰; 魏月刚
Original assignee: 特变电工智能电气有限责任公司; 特变电工股份有限公司
Priority date: 2016-06-17
Filing date: 2016-06-17
Publication date: 2017-12-21

Abstract

A three-phase three-dimensional fracture-type wound iron core and a transformer, for solving the problem found in the prior art due to the need to wind coils on core pillars of each phase. The three-phase three-dimensional fracture-type wound iron core comprises three single-frame iron cores (1). The three single-frame iron cores (1) are joined together to form a triangular symmetrical three-dimensional structure. Each of the single-frame iron cores (1) comprises an inner frame (1A) and an outer frame (1B) sleeved on the exterior of the inner frame (1A). The outer frame (1B) has formed thereon two fracture joining areas and can be opened or closed at these two fracture joining areas. The inner frame has formed thereon one fracture joining area and can be opened or closed at the fracture joining area.

Description

Three-phase three-dimensional broken type wound core and transformer

Technical field

The invention relates to the technical field of transformers, in particular to a three-phase three-dimensional broken type wound core, and a transformer.

Background technique

In recent years, with the promotion of energy-saving products in various countries around the world, three-dimensional triangular coil core products have been widely used. Since the three-dimensional triangular winding core has a special structure in which the three-phase magnetic circuit is completely symmetrical, the performance in all aspects is superior to the existing planar laminated laminated core.

The existing three-dimensional triangular core is a three-phase three-dimensional core with a circular cross-section of each phase column which is composed of three closed-shaped single-frame cores of three shapes and the same size and a semi-circular cross section. Each of the single-frame cores is wound from a continuous core material.

However, since each of the existing three-dimensional triangular cores is a closed frame structure, there are many problems. The biggest problem is that the transformer coil must be wound on each phase column, resulting in poor processability, low production efficiency, poor quality control, and limited production capacity of the manufacturing equipment. Specifically, when the coil is wound, a special winding device is required, and the winding core is required to be wound, so the winding process is difficult, complicated, and the production efficiency is low. The maintenance aspect is very difficult. Once the transformer coil fails, the coil cannot be removed from the coil core for replacement, which will inevitably lead to the scrapping of the entire transformer.

In addition, the existing three-dimensional triangular core is limited by the manufacturing equipment and can only be used to manufacture transformer products with a small capacity (100 to 2500 KVA), and the production enterprises also need to invest a large amount of dedicated winding equipment, resulting in existing The promotion of the three-dimensional triangular coil core is greatly limited.

Summary of the invention

The present invention provides a three-phase three-dimensional fractured core and a transformer for solving the above problems caused by coils that must be wound on each of the core columns in the prior art.

The technical solution adopted to solve the technical problem of the present invention is:

The present invention provides a three-phase three-dimensional broken type wound core, comprising three single-frame iron cores, and the three single-frame iron cores are combined into a triangular symmetric three-dimensional structure, wherein each of the single-frame iron cores comprises an inner frame and a sleeve. An outer frame outside the inner frame, the outer frame is formed with two fracture seam regions, and is openable at the two fracture joint regions, and the inner frame is formed with a fracture seam region, and It can be opened and closed at the joint area of the fracture.

Optionally, the inner frame is sequentially sleeved by a plurality of inner core sheets, and each inner core piece is provided with a fracture is located at the upper iron yoke, and the joint at the fracture of each inner core piece constitutes an upper fracture joint region; the outer frame is formed by sequentially arranging a plurality of outer core sheets, each outer core There are two fractures on the sheet, which are located at the position of the left core column near the upper iron yoke and the position of the right heart column near the upper iron yoke, and the seam at the left fracture of each outer core piece constitutes the left fracture joint area. The seam at the right fracture of each outer core piece constitutes the right fracture seam area.

Alternatively, the inner frame is sequentially sleeved by a plurality of inner core sheets, each of which has a fracture on the inner core sheet and is located at the lower iron yoke, and the joints of the inner core sheets are formed under the joints. a fracture joint area; the outer frame is sequentially sleeved by a plurality of outer core sheets, and each outer core piece is provided with two fractures respectively located at a position of the left core pillar near the lower iron yoke and the right side The column of the heart is close to the position of the lower iron yoke, and the seam at the left fracture of each outer core piece constitutes the seam area of the left fracture, and the joint at the right fracture of each outer core piece constitutes the seam area of the right fracture.

Optionally, the fracture positions on the adjacent two inner core sheets are misaligned; the left fracture positions of the adjacent two outer core sheets are misaligned; and the right fracture positions of the adjacent two outer core sheets are misaligned.

Further, the fracture joint in the seam region of the upper fracture is arranged in a stepped manner; the fracture joint in the joint region of the left fracture is arranged in a zigzag manner; The fracture joints are arranged in a zigzag misalignment.

Optionally, each of the inner core sheets and each of the outer core sheets are polygonally disposed.

Further, each of the single-frame iron cores is formed by a plurality of inner core sheets and a plurality of outer core sheets which are bent into a polygonal shape and have a plurality of steps in a width, and are sequentially stacked into a core closed loop.

Optionally, each of the single-frame cores has a semi-circular or circumscribed semi-circular polygon.

Optionally, each of the single frame cores is made of a silicon steel material.

The present invention also provides a transformer including the above three-phase three-dimensional fracture type winding core.

Beneficial effects:

The three-phase three-dimensional fracture type winding iron core of the invention has two fracture joint seam regions on its outer frame and a fracture joint region on the inner frame thereof, and only needs to wind the ordinary winding machine. The formed coils can be inserted into each of the center pillars through the breaks on the outer frame and the breaks on the inner frame, without the need to wind the coils on each of the center pillars, so the manufacturing process is good, and the production is good. High efficiency, easy to control production quality, and unlimited production capacity of manufacturing equipment. When the transformer coil fails, simply remove the coil from the corresponding phase column and replace it with a new one. The maintenance is simple and convenient. Moreover, since the three-phase three-dimensional broken type wound core is not limited by the manufacturing equipment, it can be used for manufacturing a transformer product with a large capacity (below 31,500 KVA), and the production enterprise does not need to invest in a dedicated winding device, and is easy to promote and apply, and the application. bright future.

In addition, the three-phase three-dimensional fracture type winding core of the invention is suitable for both oil-immersed transformers and various dry types. transformer.

DRAWINGS

1 is a schematic view of a three-phase three-dimensional fracture type wound core and a coil assembled according to Embodiment 1 of the present invention;

2 is a front view of a single-frame iron core according to Embodiment 1 of the present invention;

Figure 3 is a front elevational view of an outer core piece of Figure 2;

Figure 4 is a front elevational view of an inner core piece of Figure 2;

5 is a schematic view showing the arrangement of the fracture joints of the single-frame iron core according to Embodiment 1 of the present invention;

Figure 6 is a cross-sectional view taken along line A-A of Figure 5;

FIG. 7 is a schematic structural view of a laminated core of a conventional planar arrangement.

In the figure: 1 - single frame core; 11 - inner core piece; 1A - inner frame; 12 - outer core piece; 1B - outer frame; 13 - upper fracture seam; 14 - left fracture seam; Fracture seam; 2-coil.

detailed description

In order to make those skilled in the art better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

Example 1:

As shown in FIG. 1-6, the present embodiment provides a novel energy-saving three-phase three-dimensional broken type wound core, which comprises three single-frame iron cores 1 of the same shape and size, and the cross-section of each single-frame iron core 1 is Semi-circular or circumscribed semi-circular polygons, the three single-frame iron cores 1 are combined into a triangular symmetrical three-dimensional structure, wherein each of the center pillars has a circular cross section, and three coils 2 are respectively sleeved on the three-phase three-dimensional fracture type Roll the core of each phase column (as shown in Figure 1).

Preferably, each single-frame core 1 is made of a silicon steel material. Silicon steel is a silicon-containing steel with a silicon content between 0.8% and 4.8%. The choice of silicon steel material to make the core of the transformer is because silicon steel itself is a magnetic material with strong magnetic permeability. When the coil is energized, it can generate a large magnetic induction intensity, which can reduce the volume of the transformer.

It should be noted that, due to the influence of the actual manufacturing process, the cross-section of each single-frame core may not be made into a semi-circular shape in a strict sense, or an circumscribed semi-circular polygon in a strict sense, so that it is described in this embodiment. The semicircle is approximately semicircular, the circle is approximately circular, and the polygon is an approximate polygon, wherein the approximate polygon means that each edge of the polygon is an approximate straight segment.

As shown in FIGS. 5 and 6, each of the single-frame cores 1 includes an inner frame 1A and an outer frame 1B sleeved outside the inner frame 1A, and the outer frame 1B is formed with two fracture seam regions, and The two fracture joint areas are openable and closable, and the inner frame 1A is formed with a fracture joint area, and is openable and closable at the fracture joint area.

Specifically, the two fracture seam areas on the outer frame 1B divide the outer frame 1B into two separate parts, an upper half and a lower half, respectively, which can be combined into one by the two fracture joint areas. overall. When it is necessary to insert the coil into each of the phase pillars, the outer frame 1B is first divided into upper and lower portions along the two fracture joint areas on the outer frame 1B, and a part of the outer frame 1B (ie, the lower half) ) is still sleeved outside the inner frame 1A, and the other portion (ie, the upper half) of the outer frame 1B is separated from the inner frame 1A, and the fracture seam region on the inner frame 1A and the portion of the outer frame 1B (ie, The lower half of the opening corresponds to the opening, and then the inner frame 1A is turned outward along the fracture seam area thereon, thereby opening the inner frame 1A, and then passing the coil sequentially through the opening of the outer frame 1B and the inner frame. The break of 1A is inserted into each phase column.

As shown in FIG. 2-6, specifically, the inner frame 1A is formed by a plurality of inner core sheets 11 being internally or externally or externally and internally, in other words, a plurality of inner core sheets are stacked. The inner frame 1A has a fracture on each of the inner core sheets 11 and is located at the upper iron yoke of the single-frame iron core, and the fracture may be referred to as an upper fracture, and the upper fracture joint of each inner core piece 11 is 13 Forming an upper fracture seam region; the outer frame 1B is formed by a plurality of outer core sheets 12 being sleeved from the inside out or from the outside to the inside, in other words, a plurality of outer core sheets are stacked into the outer frame 1B, Each outer core piece 12 is provided with two fractures, which are respectively located at the position of the left core of the single frame core near the upper iron yoke and the right core of the single frame core near the upper iron yoke. The fractures may be referred to as a left fracture and a right fracture, respectively, and the left fracture seam 14 of each outer core sheet 12 constitutes a left fracture seam region, and the right fracture seam 15 of each outer core sheet 12 constitutes a right fracture seam region. Wherein, the heart column of the single-frame iron core refers to the part of the single-frame iron core to be sheathed, and can be divided into a left heart column and a right heart column; the iron yoke of the single-frame iron core refers to the single-frame iron core not required The part of the coil is only used to close the magnetic circuit, and can be divided into an upper iron yoke and a lower iron yoke; the number and thickness of the inner core piece 11 and the outer core piece 12 can be determined according to actual production conditions and specific processing techniques. To determine, no longer repeat them here.

Preferably, as shown in FIG. 2, the fracture positions on the adjacent two inner core sheets 11 are misaligned; the left fracture positions of the adjacent two outer core sheets 12 are misaligned; adjacent two outer core sheets The right side fracture position of 12 is misplaced. The manner in which the fracture position is dislocated is such that the magnetic core of the coil core of the embodiment is consistent with the magnetic properties of the existing coil core, and on the one hand, the single-frame cores are easily docked along the disconnection, and on the other hand, the individual sheets are facilitated. The magnetic resistance of the frame core.

Further preferably, as shown in FIG. 5, the fracture joints in the seam region of the upper fracture are arranged in a stepped manner; the fracture joints in the seam region of the left fracture are arranged in a zigzag manner; The fracture joints in the seam area of the right fracture are arranged in a zigzag dislocation. The manner in which the fracture joint is arranged in a zigzag manner is advantageous for guiding the assembly of the core and the coil in the embodiment, and conveniently forming a combination of the inner core sheets and the outer core sheets. (When assembling each single-frame core, in order to facilitate assembly, a plurality of adjacent inner core sheets may be formed into a group, and the upper half of several adjacent outer core sheets may be formed into a group, and several adjacent portions may be formed. The lower half of the outer core sheet is formed into a group, and then the inner core sheets of each group are assembled, and the upper half of each outer core sheet is assembled, and the outer core sheets of each group are assembled. The lower half is assembled to form a single-frame core, butt and stack.

When the three-phase three-dimensional broken-type winding core and the coil are assembled in the embodiment, the vertical fitting manner is adopted, and the upper half of the outer frame of each single-frame iron core is first arranged along the left fracture joint area which is arranged in a zigzag manner and The right fracture joint area is removed, and the inner frame of each single frame core is turned outward along the upper fracture joint area, thereby opening the single frame cores, and then three coils are respectively inserted into the respective center pillars, wherein each The center column is formed by splicing adjacent cores of adjacent single-frame cores, for example, a right-handed core of a single-frame core and a left-handed column of another adjacent single-frame core, of course, The right side pillar is also disposed adjacent to the left heart pillar, and finally the outer core sheets in the outer frame of each single frame core and the inner core sheets in the inner frame are reset, thereby completing the implementation. For example, the assembly of the coil core and the coil. Wherein, the lower half of the adjacent stems of the adjacent single-frame cores (corresponding to the lower half of the outer frame) are bundled together by the insulating tape to serve a fixed function; when the outer frames of the single-frame iron cores are After the outer core sheets and the inner core sheets in the inner frame are reset, the upper iron yokes of the single frame cores (corresponding to the upper half of the outer frame) are bundled together by an insulating tape to serve as a fixing function; When the upper half of the outer frame of each single frame core is removed or reset along the left fracture seam area and the right fracture seam area arranged in a zigzag dislocation, all the outer core pieces of each single frame core can be The upper part is divided into a plurality of groups, so that the upper half of all the outer core pieces can be removed or reset one by one to facilitate the opening/closing of the single-frame iron cores.

Specifically, each of the inner core sheets 11 and each of the outer core sheets 12 are polygonally disposed. In other words, each of the inner core sheets 11 and each of the outer core sheets 12 are in the form of polygonal flaps. For example, the octagon shown in FIGS. 3 and 4 may be a rectangle provided with chamfers at four vertices.

Each of the single-frame cores 1 is sequentially stacked into a closed loop by the inner core sheets and the outer core sheets which are bent into a polygon. Wherein, the widths of all the outer core sheets and all the inner core sheets of each single-frame core 1 are multi-stepped, and the width directions of the inner core sheets/outer core sheets are perpendicular to FIG. 2 and FIG. 3 . The direction of the paper surface in Fig. 4, and the difference between the widths of the adjacent two inner core sheets/outer core sheets is one step.

The manufacturing process of each single-frame iron core 1 is specifically: firstly, a continuous silicon steel strip is opened by a curve cutter and a specific numerical control technology to form all inner core sheets and all of the widths in a stepped manner. The outer core piece is then subjected to a forming operation for each inner core piece and each outer core piece by means of numerically controlled length bending and cutting to form the upper fracture joint 13 shown in FIGS. 2 to 4 . An inner core piece 11 bent into a polygon, and an outer core piece 12 having a left fracture joint 14 and a right fracture seam 15 which are bent into a polygonal shape, wherein the inner core pieces are bent and Each of the outer core sheets has a shaping ability (i.e., the ability to maintain a shape unchanged), the shape of which can be maintained as a polygon, and then all of the inner core sheets and all outer core sheets in which the widths are arranged in multiple steps are sequentially The single-frame core 1 is formed by stacking (socketing), and the cross-section is a semi-circular or circumscribed semi-circular polygon, and is shaped and annealed to form a single-frame core product.

The existing three-dimensional triangular coil core has a special structure with three-phase magnetic circuit completely symmetrical, so all aspects of performance It is superior to the existing planar laminated core, but since each of the existing three-dimensional triangular cores is a closed frame structure, there are many problems, such as: the coil must be in each phase Winding on the column; special winding equipment is required for winding the coil, and the winding core is required to be wound; maintenance is difficult.

Based on this, the present embodiment proposes a three-phase three-dimensional fracture type wound core having the above structure, since two fracture joint regions are provided on the outer frame thereof, and a fracture joint region is provided on the inner frame thereof, only The coil wound by the ordinary winding machine needs to be inserted into each of the center pillars through the disconnection on the outer frame and the disconnection on the inner frame, so that the coil winding does not require special winding equipment. It also does not need to be wound with a coil core. The specific processing method is similar to the laminated core of the existing plane arrangement, which avoids the restriction of special equipment and mold during the coil winding process. When the coil fails, it is only necessary to remove the fault coil from the corresponding phase column for replacement, and the maintenance is simple and convenient. The performance of the three-phase three-dimensional broken type wound core in the embodiment is close to that of the existing three-dimensional triangular-shaped core, which not only facilitates the guiding of the winding core and the coil, but also conveniently realizes the inner core sheets and the outer layers. Grouping, docking and stacking of layer core sheets.

It can be seen that the winding of the coil on the three-phase three-dimensional fracture type winding core core of the embodiment is completely liberated, and the traditional production mode can be completely used, and the high and low voltage coils can be independently wound in the traditional production mode, and can also be wound by multiple windings. The wire machine is wound at the same time, so it can be flexibly adjusted according to the production task and delivery date, and the winding efficiency is high, thereby overcoming the single-frame iron core of the closed frame structure in the existing three-dimensional triangular coil core. A series of problems caused by closed winding production. In addition, the dry type transformer adopting the three-phase three-dimensional fracture type winding iron core of the embodiment has no special requirements in the coil casting process, and the traditional casting process can be completely used, and the coil can be directly wound on the casting inner mold, and the mold structure Simple and easy to wind.

The three-phase three-dimensional fracture type coil core of the embodiment also has the advantages of high production efficiency, low mold cost, less special equipment and less tooling, and the product production process can realize the parallel winding of the coil and the coil core, and break through the existing three-dimensional triangular coil core product. The manufacturing bottleneck also has the performance advantages of the existing three-dimensional triangular core, and the performance advantages of the existing three-dimensional triangular core are organically combined with the efficiency advantages of the conventional iron production mode, and have high superiority.

As shown in Fig. 7, the core of the existing transformer is a planarly arranged laminated structure, the three-phase magnetic circuit is inconsistent (asymmetric), the intermediate B-phase magnetic circuit is the shortest, and the A-phase and C-phase magnetic paths on both sides are compared. Long, because the magnitude of the reluctance is proportional to the length of the magnetic circuit, the reluctance of the three-phase magnetic circuit is not equal, resulting in unbalanced three-phase no-load current, which is polluted by the power grid. At the same time, there are many connections in the magnetic circuits of each phase. An air gap formed by the slit, which increases the magnetic resistance of the magnetic circuit, thereby increasing loss and no-load current. In the three-phase three-dimensional fracture type winding core of the embodiment, the three-phase magnetic circuit is the most ideal three-dimensional triangle, and the three-phase magnetic circuit is completely symmetrical, so the magnetic path length and magnetic resistance of the stem of the three single-frame iron cores 1 Both are consistent and shortest, so that the three-phase no-load current is completely balanced, the voltage waveform is good, and there is no pollution to the power grid. In addition, in the case of the same core cross section, window height, and center distance, since the magnetic circuit of the three-phase three-dimensional fracture type core structure is the shortest, the iron of the existing laminated structure is compared. The core, the iron yoke is used in a small amount, thereby reducing the manufacturing cost of the product.

In this embodiment, the magnetic conductive direction of the silicon steel strip forming the single-frame iron core is completely consistent with the magnetic circuit direction, and the shortest, which greatly reduces the no-load loss and the no-load current, thereby reducing the energy consumption of the transformer itself and improving the power consumption. Energy use efficiency, energy saving effect, harmonic content reduction, power supply quality improvement, strong thermal shock resistance, safe and reliable performance, high efficiency and energy saving using traditional materials but more compact structure Type transformer core.

The embodiment further provides a transformer including the three-phase three-dimensional broken type wound core of the above structure, and the transformer may be an oil-immersed transformer or a dry-type transformer of various types.

Example 2:

This embodiment also provides a novel energy-saving three-phase three-dimensional broken type wound core, which differs from Embodiment 1 only in that the fractures provided on each inner core piece are located at the lower iron yoke, and each outer core piece is disposed on the outer core piece. The two fractures are located at the position of the left core near the lower iron yoke and the position of the right core near the lower iron yoke (not shown).

Specifically, in the embodiment, the inner frame is formed by a plurality of inner core sheets from the inside to the outside or from the outer to the inner, and each inner core piece is provided with a fracture and is located in the single frame. At the lower iron yoke of the core, the fracture may be referred to as a lower fracture, and the joint at the lower fracture of each inner core sheet constitutes a lower fracture joint region; the outer frame is composed of a plurality of outer core sheets from the inside out or It is sleeved from the outside and the inside, and each outer core piece is provided with two fractures, which are respectively located at the left core of the single frame core near the lower iron yoke and the right core of the single frame core is close to the lower core. At the position of the iron yoke, the two fractures may be referred to as a left fracture and a right fracture, respectively, and the joints at the left fracture of each outer core sheet constitute a left fracture joint region, and the joints at the right fracture of each outer core sheet constitute a right Fracture seam area.

The related features of the structure of the three-phase three-dimensional broken type wound core of the present embodiment and the structure of the three-phase three-dimensional broken type wound core of the first embodiment can be referred to each other, and details are not described herein again.

The three-phase three-dimensional fracture type winding iron core of the embodiment of the invention has two fracture joint seams on the outer frame and a fracture joint area on the inner frame thereof, and only needs to wind the ordinary winding machine The prepared coil can be inserted into each of the center pillars through the disconnection on the outer frame and the break on the inner frame, without the need to wind the coil on each phase column, so the manufacturing process is good. The production efficiency is high, the production quality is easy to control, and the production capacity of the manufacturing equipment is not limited. When the transformer coil fails, simply remove the coil from the corresponding phase column and replace it with a new one. The maintenance is simple and convenient. The stress generated during the assembly process of the coil core and the coil is small, and the additional loss of the core can be greatly reduced.

Moreover, the transformer made of the three-phase three-dimensional fracture type winding core according to the embodiment of the invention has superior electromagnetic performance. The three-phase magnetic circuit is completely symmetrical, and has the characteristics of short magnetic circuit, small excitation current, low no-load loss, low harmonics and low noise, small volume, light weight, energy saving of materials, and the like. The transformer made of three-dimensional fractured coil core also has superior process performance, can realize mechanization of core manufacturing, and separate manufacturing of core and coil, effectively solving the existing three-dimensional triangular coil core because the coil must be in each phase column All kinds of difficulties and problems caused by winding up. Manufacturers can manufacture 3,500KVA and below low-cost, low-loss transformer products without the need to invest a large amount of special equipment, which is easy to promote and apply, and has broad application prospects.

While the preferred embodiment of the invention has been described, it will be understood that Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and the modifications and

It can be understood that the numbers of the above embodiments (ie, Embodiment 1 and Embodiment 2) are used to distinguish the embodiments, and do not represent the advantages and disadvantages of the embodiments.

It is apparent that those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and modifications of the invention

Claims

A three-phase three-dimensional broken type wound core comprises three single-frame iron cores, and the three single-frame iron cores are combined into a triangular symmetric three-dimensional structure, wherein each of the single-frame iron cores comprises an inner frame and a sleeve An outer frame outside the inner frame, the outer frame is formed with two fracture seam regions, and is openable at the two fracture joint regions, and the inner frame is formed with a fracture seam region, and It can be opened and closed at the joint area of the fracture.
The core of claim 1 , wherein the inner frame is sequentially sleeved by a plurality of inner core sheets, each of which has a fracture on the inner core piece and is located at the upper iron yoke. The joints at the fractures of the inner core sheets constitute the upper fracture joint region; the outer frame is formed by sequentially arranging a plurality of outer core sheets, and each outer core sheet is provided with two fractures, respectively located at the left The side pillar is located near the upper iron yoke and the right core is near the upper iron yoke, and the seam at the left fracture of each outer core piece constitutes a left fracture seam area, and the seam of the outer fracture of each outer core piece is seamed. Form the right fracture seam area.
The core of claim 1 , wherein the inner frame is sequentially sleeved by a plurality of inner core sheets, each of which has a fracture on the inner core piece and is located at the lower iron yoke. The joints at the fractures of the inner core sheets constitute a lower fracture joint region; the outer frame is formed by sequentially arranging a plurality of outer core sheets, and each outer core sheet is provided with two fractures, respectively located at the left The side pillar is located near the lower iron yoke and the right core is near the lower iron yoke, and the seam at the left fracture of each outer core piece constitutes the left fracture joint area, and the seam of the right outer core piece is at the right fracture joint. Form the right fracture seam area.
The core of claim 2 or 3, wherein the fracture positions on the adjacent two inner core sheets are misaligned; the left fracture positions of the adjacent two outer core sheets are misaligned; The position of the right side of the outer core piece is misaligned.
The core of claim 4, wherein the fracture seam in the seam region of the upper fracture is arranged in a stepped manner; the fracture seam in the seam region of the left fracture is a zigzag misalignment row Cloth; the fracture joint in the seam region of the right fracture is arranged in a zigzag dislocation.
A rolled core according to claim 2 or 3, wherein each of said inner core sheets and each of said outer core sheets are disposed in a polygonal shape.
A core according to claim 6, wherein each of said single-frame cores is sequentially formed into a closed loop by inner core sheets and outer core sheets which are bent into a polygonal shape, wherein each of said outer core sheets is sequentially closed. The widths of all the outer core sheets and all the inner core sheets of the single-frame core are distributed in a plurality of steps, and the difference between the widths of the adjacent two inner core sheets or the outer core sheets is one step.
A core according to claim 1, wherein each of said single-frame cores has a semicircular or circumscribed semicircular cross section.
A rolled core according to claim 1, wherein each of said single-frame cores is made of a silicon steel material.
A transformer comprising the three-phase three-dimensional fracture type wound core according to any one of claims 1 to 9.