Voltage transformer configured with a multi-form core

Abstract

The application relates to the technical field of mutual inductors, in particular to a voltage mutual inductor configured with a multi-form core, which comprises a ring-shaped core wound by silicon steel sheets; the width of the silicon steel sheet layer in the middle layer of the ring-shaped core gradually decreases to the silicon steel sheet layer in the outer layer of the ring-shaped core; the distance between the two side edges of two adjacent silicon steel sheet layers is less than 1 mm; after the two adjacent silicon steel sheet layers are stacked, steps are formed due to the width difference, the steps are filled with a soft magnetic layer, and the smooth transition soft magnetic layer is formed. The ring-shaped core wound by the silicon steel sheets is approximately circular in cross section, under the condition that the outer edge length is constant, the cross section of the core is increased in cross-sectional area, the magnetic field is concentrated, the outer layer magnetic flux concentration and leakage magnetic flux are reduced, the magnetic flux capacity is improved, and the edge eddy current loss is reduced.

Description

Technical Field

[0001] This application relates to the field of transformer technology, and in particular to a voltage transformer. Background Technology

[0002] The core of a voltage transformer is typically made of laminated silicon steel sheets. These silicon steel sheets are laminated together with insulating layers to form a high-permeability core, which is used to concentrate magnetic flux, reduce energy loss, and reduce eddy currents.

[0003] Traditional iron cores are multi-laminated iron cores wound in a stepped manner. The stepped structure will generate magnetic flux concentration at the corners, resulting in enhanced local magnetic fields and increased eddy current losses. Utility Model Content

[0004] The purpose of this section is to outline some aspects of the embodiments of this utility model and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of this section, the abstract and the title of this utility model. Such simplifications or omissions shall not be used to limit the scope of this utility model.

[0005] In view of the problems existing in the prior art, the present invention is proposed.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0007] Voltage transformers with various core configurations, including toroidal cores wound with silicon steel sheets;

[0008] The width of the silicon steel sheet layer in the middle layer of the annular core gradually decreases towards the outer layer of the annular core.

[0009] The distance between the two edges of two adjacent silicon steel sheets is less than 1 mm;

[0010] When two adjacent silicon steel sheets are stacked, there is a step formed by the difference in width. The step is filled with a soft magnetic layer, forming a soft magnetic layer with a smooth transition.

[0011] In the above design, the width of the silicon steel sheet layer in the middle layer gradually decreases towards the outer layer of the toroidal core, making the cross-section of the toroidal core formed by the silicon steel sheets approximately circular. Under the condition of a fixed outer edge length, the cross-sectional area of ​​the core can be increased, which helps to concentrate the magnetic field, reduce the concentration and leakage of magnetic flux in the outer layer, help to increase the magnetic flux capacity and reduce edge eddy current losses, thereby enhancing the performance of the toroidal core. The soft magnetic layer helps to further concentrate the magnetic flux inside the core, reduce the abrupt change of the edge magnetic flux, further concentrate the magnetic field and improve the ability to resist external magnetic field interference, further enhancing the performance of the toroidal core.

[0012] Preferably, the width difference between two adjacent silicon steel sheet layers gradually decreases from the edge to the center. This makes the cross-section of the toroidal core wound from the silicon steel sheets closer to a circle, which helps to concentrate the magnetic field and further enhances the performance of the toroidal core.

[0013] Preferably, the annular core has a central annular layer located between the outer and inner sides, with the center as the inner side and the periphery as the outer side.

[0014] The edge of the silicon steel sheet layer on the outer side of the central annular layer is provided with a slope, and the slope is inclined outward in the direction from the inside to the outside.

[0015] The edge of the silicon steel sheet layer inside the central annular layer is provided with another slope, and the slope is inclined in the direction from the outside to the inside.

[0016] By using an inclined plane and another inclined plane, the surface of the toroidal core is made smoother, reducing abrupt changes in the toroidal core caused by the thickness steps of the silicon steel sheets, and avoiding unnecessary losses and local magnetic field concentrations in the magnetic flux at gaps or abrupt change points.

[0017] Preferably, the inclined surface is an arc-shaped inclined surface; the other inclined surface is another arc-shaped inclined surface.

[0018] Further improve the surface smoothness of the toroidal core, reduce magnetic reluctance changes, slow down abrupt changes in the magnetic field, and enhance the performance of the toroidal core.

[0019] Preferably, the width of the outermost silicon steel sheet layer is 25-35mm; the width of the widest silicon steel sheet layer is 80-100mm.

[0020] The overall outline gradually transitions from the edge to the maximum width, and the cross-section of the annular iron core is approximately circular.

[0021] Preferably, the thickness of the silicon steel sheet is 1.5-2.5 mm. This ensures the magnetic properties of the toroidal core wound with the silicon steel sheet, while preventing wrinkles from occurring during the winding or cutting of the silicon steel sheet and affecting the magnetic properties of the toroidal core.

[0022] Preferably, during the winding of the toroidal core, the width of the shearing is adjusted while the silicon steel sheet is wound. Ensuring the continuity of the toroidal core winding helps to form a smooth, gradually changing outer surface of the toroidal core. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0024] Figure 1 A schematic diagram of the cross-sectional structure of a multi-morphic iron core as described in one embodiment of this utility model;

[0025] Figure 2 This is a schematic diagram of a multi-form iron core configuration according to an embodiment of the present invention. Detailed Implementation

[0026] To make the above-mentioned objectives, features and advantages of this utility model more readily understood, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0027] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0028] Secondly, this utility model is described in detail with reference to the schematic diagrams. When describing the embodiments of this utility model, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of this utility model. In addition, actual manufacturing should include the three-dimensional spatial dimensions of length, width, and depth.

[0029] Furthermore, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in an embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single embodiment or an embodiment selectively excluded from other embodiments.

[0030] Example 1

[0031] Reference Figures 1-2 This embodiment provides a voltage transformer with a multi-form core, including a toroidal core 1 wound with silicon steel sheets 2.

[0032] The width of the silicon steel sheet layer 21 in the middle layer of the annular core 1 gradually decreases towards the outer layer of the annular core 1.

[0033] The distance between the two edges of two adjacent silicon steel sheets 21 is less than 1 mm;

[0034] When two adjacent silicon steel sheet layers 21 are stacked, there is a step formed by the width difference. The step is filled with a soft magnetic layer 3, forming a soft magnetic layer 3 with a smooth transition.

[0035] The width of the silicon steel sheet layer 21 in the middle layer gradually decreases towards the outer layer of the toroidal core 1, making the cross-section of the toroidal core 1 formed by the silicon steel sheet 2 approximately circular. Under the condition of a fixed outer edge length, the cross-sectional area of ​​the core can be increased, which helps to concentrate the magnetic field, reduce the concentration and leakage of magnetic flux in the outer layer, help to increase the magnetic flux capacity and reduce the edge eddy current loss, thereby enhancing the performance of the toroidal core 1. The soft magnetic layer 3 helps to further concentrate the magnetic flux inside the core, reduce the abrupt change of the edge magnetic flux, further concentrate the magnetic field and improve the ability to resist external magnetic field interference, further enhancing the performance of the toroidal core 1.

[0036] The outermost silicon steel sheet layer 21 has a width of 25-35mm; the widest silicon steel sheet layer 21 has a width of 80-100mm. This allows the overall outline to gradually transition from the edge to the maximum width, making the cross-section of the annular iron core 1 approximately circular.

[0037] The thickness of the silicon steel sheet 2 is 1.5-2.5mm. This ensures the magnetic properties of the toroidal core 1 wound with the silicon steel sheet 2, and also prevents wrinkles from occurring during the winding or cutting of the silicon steel sheet 2, which would affect the magnetic properties of the toroidal core 1.

[0038] During the winding of the toroidal core 1, the width of the shearing is adjusted while the silicon steel sheet 2 is wound. Ensuring the continuity of the winding of the toroidal core 1 helps to form a smooth and gradually changing outer surface of the toroidal core 1.

[0039] During use, the silicon steel sheet 2 is wound around the toroidal core 1 while adjusting the shearing width. The width of the silicon steel sheet layer 21 in the middle layer of the toroidal core 1 gradually decreases towards the outer layer. The overall profile gradually transitions from the edge to the maximum width, and the cross-section of the toroidal core 1 is approximately circular. Under the condition of a fixed outer edge length, the cross-sectional area of ​​the core can be increased, which helps to concentrate the magnetic field, reduce the concentration of magnetic flux and leakage in the outer layer, help to increase the magnetic flux capacity and reduce edge eddy current losses, thereby enhancing the performance of the toroidal core 1.

[0040] Example 2

[0041] Reference Figure 1 This is the second embodiment of the present invention, which is based on the previous embodiment.

[0042] The width difference between two adjacent silicon steel sheet layers 21 gradually decreases from the edge to the middle. This makes the cross-section of the toroidal core 1 wound from the silicon steel sheet 2 closer to a circle, which helps to concentrate the magnetic field and further enhances the performance of the toroidal core 1.

[0043] The toroidal core 1 has a central annular layer located between the inner and outer sides, with the center as the inner side and the outer side as the outer side. The edge of the silicon steel sheet layer 21 on the outer side of the central annular layer has a bevel 22, with the bevel 22 tilting outwards from the inside. The edge of the silicon steel sheet layer 21 on the inner side of the central annular layer has another bevel 22, tilting inwards from the outside. These bevels 22 and the other bevel 22 make the surface of the toroidal core 1 smoother, reducing abrupt changes caused by the thickness steps of the silicon steel sheets 2, and preventing unnecessary magnetic flux loss and localized magnetic field concentration at gaps or abrupt change points.

[0044] The inclined surface 22 is configured as an arc-shaped inclined surface 22; the other inclined surface 22 is configured as another arc-shaped inclined surface 22. This further improves the smoothness of the surface of the toroidal core 1, reduces magnetic reluctance changes, slows down abrupt changes in the magnetic field, and enhances the performance of the toroidal core 1.

[0045] In use, the width difference gradually decreases from the edge to the middle, making the cross-section of the toroidal core 1 wound from the silicon steel sheet 2 closer to a circle. Through the use of inclined plane 22 and another inclined plane 22, both of which are arc-shaped, the surface of the toroidal core 1 is made smoother, which helps to concentrate the magnetic field and further enhances the performance of the toroidal core 1.

[0046] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible without substantially departing from the novelty and advantages of the subject matter described in this application. For example, variations in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values ​​such as temperature, pressure, etc., installation arrangements, use of materials, color, orientation, etc. For instance, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of this utility model. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure performing the function described herein, and not only structural equivalents but also equivalent structures. Other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments without departing from the scope of this utility model. Therefore, this invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0047] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments may be described, i.e., those features that are not relevant to the best mode of carrying out the present invention as currently considered, or those features that are not relevant to implementing the present invention.

[0048] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those of ordinary skill in the art who benefit from this disclosure, the development effort will be a routine task in design, manufacturing, and production without requiring extensive experimentation.

[0049] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A voltage transformer with a multi-form iron core, including a toroidal iron core wound with silicon steel sheets, characterized in that: The width of the silicon steel sheet layer in the middle layer of the annular core gradually decreases towards the outer layer of the annular core. The distance between the two edges of two adjacent silicon steel sheets is less than 1 mm; When two adjacent silicon steel sheets are stacked, there is a step formed by the difference in width. The step is filled with a soft magnetic layer, forming a soft magnetic layer with a smooth transition.

2. The voltage transformer with multi-type iron core according to claim 1, characterized in that: The width difference between two adjacent silicon steel sheets gradually decreases from the edge to the middle.

3. The voltage transformer with multi-form iron core according to claim 1, characterized in that: The toroidal core has an inner ring-shaped layer located between the outer and inner sides, with the center as the inner side and the outer ring as the outer side. The edge of the silicon steel sheet layer on the outer side of the central annular layer is provided with a slope, and the slope is inclined outward in the direction from the inside to the outside. The edge of the silicon steel sheet layer inside the central annular layer is provided with another slope, and the slope is inclined in the direction from the outside to the inside.

4. The voltage transformer with multi-form iron core according to claim 3, characterized in that: The inclined plane is set as an arc-shaped inclined plane; The other inclined plane is set as an arc-shaped inclined plane.

5. The voltage transformer with multi-form iron core according to claim 1, characterized in that: The width of the silicon steel sheet layer closest to the edge is 25-35mm; The width of the widest silicon steel sheet is 80-100mm.

6. The voltage transformer with multi-form iron core according to claim 1, characterized in that: The thickness of the silicon steel sheet is 1.5-2.5 mm.

7. The voltage transformer with multi-form iron core according to claim 1, characterized in that: During the winding of the annular iron core, the width of the shearing is adjusted while the annular iron core is wound.

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