CN110729110B - Iron core, iron core reactor and method - Google Patents
Iron core, iron core reactor and method Download PDFInfo
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- CN110729110B CN110729110B CN201911044826.7A CN201911044826A CN110729110B CN 110729110 B CN110729110 B CN 110729110B CN 201911044826 A CN201911044826 A CN 201911044826A CN 110729110 B CN110729110 B CN 110729110B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/24—Magnetic cores
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/24—Magnetic cores
- H01F27/245—Magnetic cores made from sheets, e.g. grain-oriented
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0206—Manufacturing of magnetic cores by mechanical means
- H01F41/0233—Manufacturing of magnetic circuits made from sheets
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Abstract
The iron core is formed by laminating magnetic conductive sheets, a plurality of magnetic valves are arranged on an iron core column where a coil is arranged, the magnetic valves at least comprise two groups, and the two groups of magnetic valves are different in shape; the magnetic valves with different shapes are alternately arranged on the magnetic conductive sheet, so that the magnetic flux path of the iron core on the magnetic conductive sheet is a curved path, and at least one path is continuous and uninterrupted; in the iron core column where the magnetic valves are located, magnetic fluxes of all iron core columns traveling in a straight line in the radial direction pass through at least one air gap of one magnetic valve, and the sum of the lengths of the air gaps of the magnetic valves passing through is equal, so that the iron core reactor has better linearity.
Description
Technical Field
The disclosure belongs to the technical field of iron core reactors, and particularly relates to an iron core, an iron core reactor and a method.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The application of the reactor in the power system is very wide. In order to improve the reactance value of the reactor, an iron core can be added into the reactor coil. In order to obtain linear characteristics of the reactor with the iron core, the iron core of the reactor needs to be provided with an air gap, however, the air gap structure of the iron core of the existing reactor is composed of an iron core cake and an air gap cushion block, and due to the structural characteristics of the iron core cake and the air gap cushion block, the iron core reactor with the structure has the problems of large vibration and large noise in the operation process.
As the inventor knows, the prior art is aimed at solving the above problems, for example, chinese patent CN109273212A proposes an iron core structure, an iron core reactor and a method, which can solve the problems of vibration and noise during operation caused by the conventional air gap structure, and have relatively good linearity. However, studies have shown that the linearity of the iron core reactor can be further improved.
Disclosure of Invention
The present disclosure provides an iron core, an iron core reactor and a method for solving the above problems, and the present disclosure not only enables the iron core of the iron core reactor to have no air gap, but also has good electrical linearity and good mechanical strength.
According to some embodiments, the following technical scheme is adopted in the disclosure:
an iron core is formed by laminating magnetic conductive sheets, a plurality of magnetic valves are arranged on an iron core column where a coil is arranged, the magnetic valves at least comprise two groups, and the two groups of magnetic valves are different in shape;
the magnetic valves with different shapes are alternately arranged on the magnetic conductive sheet, so that the magnetic flux path of the iron core on the magnetic conductive sheet is a curved path, and at least one path is continuous and uninterrupted;
all the magnetic fluxes which linearly travel in the radial direction of the iron core column where the coil is located pass through at least one air gap of the magnetic valve, and the sum of the lengths of the air gaps of the magnetic valves passing through is equal.
Alternatively, a plurality of magnetic valves are arranged on each silicon steel sheet, the cross-sectional area of the residual iron core at each magnetic valve is K multiplied by M, wherein K is a coefficient, and 0 < K < 0.5, and M is the cross-sectional area of the iron core column at the non-magnetic valve.
In an alternative embodiment, each set of magnetic valves is processed on different magnetic conductive sheets, and the magnetic conductive sheets are arranged in a stacked mode.
As an alternative embodiment, the magnetic conductive sheets with two different magnetic valve shapes are sequentially and alternately laminated;
or one of the magnetic conductive sheets is laminated and then divided into two parts, and the other laminated magnetic conductive sheet is clamped in the middle;
or the two magnetic conductive sheets are evenly divided into a plurality of parts after being laminated and then are alternately arranged.
Alternatively, two adjacent magnetic valves with different shapes shield the core space of the non-magnetic valve of the other side, so that the core flux path on the magnetic conductive sheet needs to bypass each magnetic valve and form a curved path.
In an alternative embodiment, the curved path has an S-shape, and at least a part of the magnetic flux traveling straight in the radial direction must pass through the air gaps of two adjacent magnetic valves.
Alternatively, each set of magnetic valves is formed by two different magnetic valves.
More specifically, one of the magnetic valves is a hollow, the hollow is hexagonal, and is formed by arranging isosceles triangles with a height of L2 at two sides of a rectangle with a length of L1, and the bottom side of the isosceles triangle is equal to the width of the rectangle and is equal to H.
The other type of magnetic valve is a notch, the notch is in a quadrilateral shape and is formed by connecting an isosceles triangle with the length L2 at one side of a rectangle with the length L3, and the bottom edge of the isosceles triangle is equal to the height of the rectangle and is equal to H; and (L1+2 × L2+2 × L3) ═ L, L is the width of the core leg on the core leg plane where the magnetic valve size is marked.
Of course, as another alternative embodiment, one of the magnetic valves is in the shape of a left-notched pentagon, which is a rectangle of length L2 combined on the non-notched side of the rectangle of length L1;
the other magnetic valve is in a shape of a right notch pentagon, and is a rectangle with a length L2 combined on the non-notch side of a rectangle with a length L1;
wherein: the height of the rectangle of length L1 is H, the height of the rectangle of length L2 is 0.5H; and (2 × L1+ L2) ═ L, L being the width of the core leg on the core leg plane where the magnetic valve size is marked.
An iron core reactor includes the iron core.
A method for manufacturing an iron core reactor is characterized in that a plurality of magnetic valves are arranged on an iron core column where a coil is arranged, the magnetic valves at least comprise two groups, and the two groups of magnetic valves are different in shape;
the magnetic valves with different shapes are alternately arranged on the magnetic conductive sheet, so that the magnetic flux path of the iron core on the magnetic conductive sheet is a curved path, and at least one path is continuous and uninterrupted;
all the magnetic conductive sheets are arranged in an overlapped mode, in an iron core column where the magnetic valves are located, magnetic fluxes which linearly travel in the radial direction of all the iron core columns pass through at least one air gap of the magnetic valve, and the sum of the lengths of the air gaps of the magnetic valves passing through is equal.
Compared with the prior art, the beneficial effect of this disclosure is:
all magnetic fluxes traveling linearly in the radial direction of the iron core column in the iron core column where the magnetic valve is located pass through at least one air gap of the magnetic valve, and the sum of the lengths of the air gaps of the magnetic valves through which all the magnetic fluxes traveling linearly in the radial direction of the iron core column pass is equal, so that the iron core reactor has better linearity.
According to the magnetic valve, two adjacent magnetic valves are overlapped in the axial direction of the iron core, so that the space of the iron cores of the non-magnetic valves corresponding to each other is shielded, and the magnetic flux path of the iron core on the silicon steel sheet bypasses the magnetic valve of each other to form a curved path; the magnetic flux path curvature of the silicon steel sheet with the magnetic valve is large, the bending times of the magnetic flux path of the iron core are large, the magnetic flux path of the iron core is narrow, and the linearity of the iron core reactor is good.
Meanwhile, the iron core column is formed by laminating silicon steel sheets, the magnetic valve can be directly processed on the silicon steel sheets, the preparation process is simple, and meanwhile, the edge notches of one silicon steel sheet can be partially protected and supported by the iron core of another silicon steel sheet by processing the silicon steel sheets with different magnetic valve shapes in a laminated mode, so that the mechanical strength of the iron core column can be enhanced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and are not to limit the disclosure.
Fig. 1 shows a schematic shape of a first type of magnetic conductive sheet;
FIG. 2 is an enlarged view of a portion of a first magnetically permeable sheet;
FIG. 3 is a schematic view showing the shape of a second magnetic conductive sheet;
FIG. 4 is a schematic view of a third magnetic conductive sheet;
FIG. 5 shows a close-up view of a third magnetically permeable sheet;
fig. 6 is a schematic view showing the shape of a fourth magnetic conductive sheet;
wherein, 1, a hollow hole, 2 and a concave hole.
The specific implementation mode is as follows:
the present disclosure is further described with reference to the following drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
In the present disclosure, terms such as "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "side", "bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only relational terms determined for convenience in describing structural relationships of the parts or elements of the present disclosure, and do not refer to any parts or elements of the present disclosure, and are not to be construed as limiting the present disclosure.
In the present disclosure, terms such as "fixedly connected", "connected", and the like are to be understood in a broad sense, and mean either a fixed connection or an integrally connected or detachable connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present disclosure can be determined on a case-by-case basis by persons skilled in the relevant art or technicians, and are not to be construed as limitations of the present disclosure.
First, a necessary explanation is made.
A magnetic valve is processed on an iron core of the iron core reactor, namely the iron core sectional area of most sections of an iron core magnetic flux path of the iron core reactor is kept unchanged, and an iron core part of a small section of an iron core column is removed on the iron core column with a coil of the iron core reactor, so that the iron core sectional area of the section is smaller than the iron core sectional areas of other sections. The shape of the magnetic valve can be rectangular, step-shaped, triangular or other shapes; or a combination of several shapes, and the magnetic valve can also be designed in the iron core. The number of magnetic valves on the core may be one, two, or more. One or more of the number, shape and arrangement of the magnetic valves may be changed as long as a certain air gap is obtained on the iron core by the magnetic valves.
Example 1:
for convenience of explanation, the present embodiment takes an iron core of a single-phase iron core reactor as an example. The transformer iron core mainly plays a role in magnetic conduction and also has a role of a framework. The transformer core is made of various materials, and the following materials are common: 1. pure iron, mild steel and no silicon steel; 2. silicon steel sheets; 3. iron-nickel alloys (permalloy); 4. an iron-aluminum alloy; 5. an amorphous alloy; 6. a microcrystalline alloy; 7. ferrite, and the like. In order to reduce eddy current and hysteresis loss in the iron core, the conventional iron core is formed by laminating painted silicon steel sheets; silicon steel sheet is commonly called silicon steel sheet or silicon steel sheet. For convenience, sheets of various materials are collectively referred to as magnetically conductive sheets.
For convenience of description, the present embodiment is described by taking a silicon steel sheet as an example. But in other embodiments, it is not limited thereto.
The iron core of the iron core reactor is formed by laminating a plurality of silicon steel sheets. A magnetic valve is processed on an iron core of an iron core reactor, wherein the magnetic valve is processed on silicon steel sheets forming the iron core, and then the processed silicon steel sheets are stacked to form a magnetic valve structure of an iron core column. A coil is wound on a center column of an iron core of the single-phase iron core reactor, the center column and two side columns form a closed-loop magnetic flux path, and a magnetic valve is arranged on an iron core column with the coil.
The pattern of the first silicon steel sheet constituting the core limb is shown in fig. 1. In fig. 1, a magnetic valve is a magnetic valve in which a middle portion of a silicon steel sheet is cut off, a rectangular hollow 1 combined with two triangles is formed in the middle of the silicon steel sheet, iron cores are retained at two sides of the hollow 1, and the hollow may also be referred to as a hole, as shown in fig. 1 and 2. In another magnetic valve, two sides of a silicon steel sheet are symmetrically cut off, a pair of rectangular and triangular concave holes 2 are formed at two sides of the silicon steel sheet, an iron core is retained in the middle of the concave hole 2, and the concave holes can also be called as notches, as shown in fig. 1 and 2. The magnetic valves are composed of more than two magnetic valves with different shapes to form a group, and one group or a plurality of groups of magnetic valves are arranged on the silicon steel sheet in sequence. Two adjacent magnetic valves on the silicon steel sheet mutually shield the iron core space of the non-magnetic valve of the other side, so that the iron core flux path of the silicon steel sheet is shielded by the other magnetic valve after flowing through the non-magnetic valve channel, and the silicon steel sheet continuously flows forwards only by bypassing the other magnetic valve, and the iron core flux path of the flux is a bent iron core path. Two adjacent magnetic valves on the silicon steel sheet mutually shield the iron core space of the non-magnetic valve of the other side, namely, at least a part of the magnetic flux of radial straight line walking must pass through the air gap of the two adjacent magnetic valves.
In order to ensure that the magnetic flux circulating on the silicon steel sheet has no straight iron core path and only has an S-shaped bent iron core path. If the sectional area of the iron core column when the magnetic valve is not machined by the silicon steel sheet is M, the sectional area of the residual iron core at the magnetic valve is K multiplied by M, wherein: k is more than 0 and less than 0.5.
The magnetic flux tends to flow along the shortest path, that is, the magnetic flux tends to flow linearly through the columnar silicon steel sheet. In order to ensure the linear characteristic of the iron core reactor, all the linear magnetic fluxes circulating in the silicon steel sheets need to be ensured to have the same or nearly the same experience. That is, the sum of the lengths of all the air gaps in the silicon steel sheets of the core limb section is equal to the sum of the lengths of the magnetic valves passed by the radial linear magnetic flux path of the core limb, and the sum of the lengths of the cores passed by the linear magnetic flux path is equal.
Fig. 1 is a shape of a first silicon steel sheet in a core of a core reactor, and fig. 2 is a partially enlarged view of fig. 1. In order to ensure that the sum of the lengths of the air gaps of all the magnetic valves passing through the radial linear flux path of the core limb in the core limb section is equal, two isosceles triangles with the height equal to L2 are respectively combined on two sides of the rectangle with the length of L1 on the silicon steel sheet forming the core limb to form a hollow hole 1, wherein: the base of the isosceles triangle is equal to the height of the rectangle, equal to H, as shown in fig. 2. A cavity 2 formed by a pair of magnetic valves combining an isosceles triangle having a height equal to L2 on one side of a rectangle having a length of L3, wherein: the base of the isosceles triangle is equal to the height of the rectangle, equal to H, as shown in fig. 2. And satisfies (L1+2 × L2+2 × L3) ═ L. The hollow 1 and the concave 2 form a group of magnetic valves, and a silicon steel sheet is formed by one or more groups of magnetic valves. For example: FIG. 1 shows four sets of magnetic valves. It can be seen that the sum of the lengths of the air gaps of the magnetic valve passed by all the linear magnetic flux paths of the silicon steel sheets in the core limb section is equal, and the sum of the lengths of the iron cores passed by the linear magnetic flux paths is also equal.
In the embodiment of fig. 1 and 2, the magnetic valve is an isosceles triangle with the height equal to L2 and combined by a rectangle with the length of L1; it is also possible that the magnetic valve is formed by combining a rectangle of length L1 with a triangle of other shape equal to L2, for example: it may be a right triangle, or a triangle of another shape.
As can be seen from fig. 1, if the remaining core cross-sectional area at the magnetic valve is K × M, where: k is equal to 0.5. The iron core of the silicon steel sheet does not have a linear iron core flux path, and the radial linear flux of the iron core column on the silicon steel sheet needs to pass through the air gap of the magnetic valve. The magnetic flux can only take a curved path if it circulates only in the core. The curvature of the curved path is small in this case. If K is equal to 0.2. It is readily apparent that the flux can only take more tortuous paths. The research shows that: the smaller K, the greater the tortuosity of the curved path, and the better the linearity of the iron core reactor. However, the smaller K is, the larger the magnetic valve of the silicon steel sheet is, the smaller the iron core remaining at the magnetic valve is, and the smaller the connection strength of the silicon steel sheet is, and a mechanical structure needs to be added to enhance the mechanical strength of the silicon steel sheet. Conversely, the larger K is, the poorer the linearity of the iron core reactor is; but the greater the coupling strength of the silicon steel sheets. Therefore, K needs to be selected reasonably, and reasonable balance between the linearity of the iron core reactor and the connection strength of the silicon steel sheets is guaranteed. Experience has shown that: k is 0.2-0.3, and can better meet the requirement.
The greater the S-bending of the core path of the magnetic flux in the core limb, the better the linearity of the core reactor. The essence of the method is that the longer the curved iron core path in the silicon steel sheet where the magnetic valve is located is, the better the linearity of the iron core reactor is. Therefore, the more groups of magnetic valves in the silicon steel sheet, the more the bending of the bent path of the iron core is, the longer the path is, and the better the linearity of the iron core reactor is. However, as the number of groups of magnetic valves in the silicon steel sheet is increased, the connection strength of the silicon steel sheet is decreased, and a mechanical structure is required to be added to enhance the mechanical fixing strength of the core. Conversely, the smaller the number of groups of magnetic valves, the poorer the linearity of the iron core reactor; but the greater the coupling strength of the silicon steel sheets. Therefore, the number of groups of magnetic valves in the silicon steel sheet needs to be reasonably selected. Generally, when the number of groups of magnetic valves is four or so, the iron core structure is reasonable.
And K is larger than zero, so that the silicon steel sheet is not interrupted, and the magnetic flux path of the iron core on the silicon steel sheet is continuous and uninterrupted, so that the magnetic flux has a path capable of continuously circulating in an iron core medium, and the path ensures the integral mechanical strength of the silicon steel sheet. The silicon steel sheet is supported by an S-curve iron core structure, the wider the S-curve path of the iron core is, the easier the magnetic flux is to circulate, the linear characteristic of the iron core reactor is poor, and the mechanical strength of the silicon steel sheet is stronger; on the contrary, the narrower the S-curve path of the iron core, the more difficult the magnetic flux flows, the better the linear characteristics of the iron core reactor, and the worse the mechanical strength of the silicon steel sheet. The distance between the two magnetic valve arrangements in the silicon steel sheet determines the width of the S-curve path of the iron core, so the distance between the two magnetic valve arrangements in the silicon steel sheet reasonably balances the contradiction between the linear characteristic of the iron core reactor and the mechanical strength of the silicon steel sheet.
The pattern of the second silicon steel sheet of the core limb is shown in fig. 3. In fig. 3, the middle part of the core column is also cut off, a hollow 1 combining a rectangle and two triangles is formed in the middle of the core, and the core is retained at two sides of the hollow 1. There is another magnetic valve, the two sides of the core column are symmetrically cut off, a pair of rectangular and triangular concave holes 2 are formed at two sides of the silicon steel sheet, and the iron core is retained in the middle of the concave hole 2. However, the magnetic valve pattern of the second type of silicon steel sheet is different from the pattern of the first type of silicon steel sheet in that the position of the second type of silicon steel sheet cavity 1 falls at the position of the first type of silicon steel sheet cavity 2, and the position of the second type of silicon steel sheet cavity 2 falls at the position of the first type of silicon steel sheet cavity 1. If the iron core of the iron core reactor is completely formed by laminating the silicon steel sheets in the first shape shown in fig. 1 and the mechanical strength of the iron core meets the requirement, the iron core of the iron core reactor should be completely formed by laminating the silicon steel sheets in one shape. The core reactor may be entirely composed of the silicon steel sheets of the second shape as shown in fig. 3, and the core reactor characteristics composed of the silicon steel sheets of the first shape as shown in fig. 1 are equivalent to those of the core reactor composed of the silicon steel sheets of the second shape as shown in fig. 3.
If the iron core of the iron core reactor is completely formed by laminating silicon steel sheets in one shape, and the mechanical strength of the iron core reactor does not meet the requirement, the mechanical strength of the iron core can be improved by adopting a mode of laminating two silicon steel sheets. For example: if the iron core of the iron core reactor is completely formed by laminating the silicon steel sheets in the first shape shown in fig. 1, the edge of the iron core column is provided with a notch (namely, a concave hole 2), only a few iron cores support the iron core column in the middle of the concave hole 2, and the notch part of the concave hole 2 of the silicon steel sheets is a weak link of the mechanical strength of the silicon steel sheets. If the iron core column is formed by the way of laminating the first silicon steel sheet and the second silicon steel sheet, the gaps of the concave holes 2 of the two silicon steel sheets are supported by the iron core of the other silicon steel sheet. The link of the weak mechanical strength of the two silicon steel sheets is protected and supported by the iron core of the other silicon steel sheet, and the mechanical strength of the iron core column of the iron core reactor can be improved.
In order to enhance the mechanical strength of the core limb of the iron core reactor, the silicon steel sheets of the core limb of the iron core reactor can be formed by laminating two or more than two types of silicon steel sheets. For example: the first silicon steel sheet in fig. 1 and the second silicon steel sheet in fig. 3 are alternately stacked, the link of the two silicon steel sheets with weak mechanical strength is protected and supported by the remaining iron core in the cavity 1 of the other silicon steel sheet, and the mechanical strength of the iron core column is higher. The iron core column of the iron core reactor can be formed by alternately laminating two silicon steel sheets, one of the silicon steel sheets can be divided into two after being laminated, the other laminated silicon steel sheet is clamped in the middle, and the other laminated silicon steel sheet can be equally divided into a plurality of parts after being laminated and is evenly clamped in the middle. The iron core column of the iron core reactor is formed by laminating two types of silicon steel sheets, and the number of layers of the two types of silicon steel sheets can be equal or unequal. After an iron core column in the iron core reactor coil is laminated by the silicon steel sheets, the flow path of magnetic flux passing through the laminated silicon steel sheets may be shorter than the flow path of the silicon steel sheets themselves, but the laminated reluctance and the gap between the silicon steel sheets may obstruct the flow path of magnetic flux passing through the laminated silicon steel sheets. In order to further reduce the interlayer walking of the magnetic flux from one silicon steel sheet to another silicon steel sheet, 1/3 of the layer number of one silicon steel sheet is suggested.
Need to explain: in this embodiment, the structure of the core limb is described by laminating silicon steel sheets with two shapes as shown in fig. 1 and fig. 3. In fact, the core limb can also be formed by stacking silicon steel sheets with other shapes in fig. 1. The link that one of the silicon steel sheets is weak in mechanical strength is protected and supported by the residual iron core of the other silicon steel sheet, so that the effect of improving the mechanical strength of the iron core column is achieved.
K is larger than zero, so that the iron core column in the iron core reactor coil has no discontinuity. The magnetic flux path of the iron core on the iron core column where the magnetic valve is located is continuous and uninterrupted, so that the magnetic flux has a path capable of continuously circulating in an iron core medium, and the path ensures the integral mechanical strength of the iron core column. Two or more than two silicon steel sheets are stacked to form an iron core column in the iron core reactor, so that the iron core column is ensured to have enough mechanical strength to be fixed and cannot deform in operation. Unlike the existing iron core air gap reactor, the iron core column is discontinuous, an iron core cake and an air gap cushion block are required to be added in the middle of the discontinuous iron core column, and a strong mechanical fixing screw rod is required to fix the iron cakes. Therefore, the iron core reactor has small vibration and noise in the operation process.
If the iron core of the iron core reactor is not formed by laminating silicon steel sheets, the iron core is integrated. The shape and structure of the iron core are not changed, and the painting between the magnetic conductive sheets (silicon steel sheets) is removed, and the magnetic conductive sheets are integrated.
Example 2:
another two kinds of silicon steel sheets constituting the iron core of the iron core reactor are shown in fig. 4 and 6. Fig. 5 is a partially enlarged view of fig. 4. In order to ensure that the sum of the air gap lengths of the magnetic valves passed by all the straight magnetic flux paths in the core limb is equal, a rectangle of length L2 is combined on the right side of the rectangle of length L1 to form a left-side magnetic valve. The left side of the other rectangle with the length L1 is combined with the rectangle with the length L2 to form a right side magnetic valve, wherein: the height of the rectangle of length L1 is H, and the height of the rectangle of length L2 is 0.5H, as shown in FIG. 5. And satisfies (2 × L1+ L2) ═ L. The left side magnetic valve and the right side magnetic valve form a group of magnetic valves, and the iron core column is formed by one group or a plurality of groups of magnetic valves. For example: fig. 4 is a diagram showing four sets of magnetic valves.
It can be seen that, in the core limb completely composed of the silicon steel sheets with the shape shown in fig. 4, the sum of the lengths of the air gaps of the magnetic valve passed by all the linear magnetic flux paths of the silicon steel sheets in the core limb section is equal, and the sum of the lengths of the iron cores passed by the linear magnetic flux paths is also equal. In the core limb completely composed of the silicon steel sheets with the shape shown in fig. 6, the sum of the lengths of the air gaps of the magnetic valve passed by all the linear magnetic flux paths of the silicon steel sheets in the core limb section is equal, and the sum of the lengths of the iron cores passed by the linear magnetic flux paths is also equal.
If the core limb formed by the silicon steel sheet with the shape shown in fig. 4 alone or the core limb formed by the silicon steel sheet with the shape shown in fig. 6 alone has insufficient mechanical strength, the core limb can be formed by two silicon steel sheets with the shapes shown in fig. 4 and 6. The two silicon steel sheets in the shapes shown in fig. 4 and fig. 6 jointly form the iron core column, and the link with weak mechanical strength of one silicon steel sheet is protected and supported by the residual iron core of the other silicon steel sheet, so that the effect of improving the mechanical strength of the iron core column is achieved.
The analytical method of example 2 is the same as that of example 1. The same parts of example 2 as example 1 are no longer burdensome.
The same analysis as in example 1, no more cumbersome.
The preparation details of the iron core reactor can be designed and manufactured by the prior art, can be completely realized, and has wide application prospect.
The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Although the present disclosure has been described with reference to specific embodiments, it should be understood that the scope of the present disclosure is not limited thereto, and those skilled in the art will appreciate that various modifications and changes can be made without departing from the spirit and scope of the present disclosure.
Claims (9)
1. An iron core is formed by laminating magnetic conductive sheets, and is characterized in that: a plurality of magnetic valves are arranged on the iron core column where the coil is located, the magnetic valves at least comprise two groups, and the shape of each group of magnetic valves is different; each group of magnetic valves are processed on different magnetic conductive sheets, and the magnetic conductive sheets are arranged in a stacked mode;
the magnetic valves with different shapes are alternately arranged on the magnetic conductive sheet, so that the magnetic flux path of the iron core on the magnetic conductive sheet is a curved path, and at least one path is continuous and uninterrupted;
all the magnetic fluxes which linearly travel in the radial direction of the iron core column where the coil is located pass through at least one air gap of the magnetic valve, and the sum of the lengths of the air gaps of the magnetic valves passing through is equal.
2. A core as claimed in claim 1, characterized in that: the magnetic conductive sheet is provided with a plurality of magnetic valves, the cross section area of the residual iron core at each magnetic valve is K multiplied by M, wherein K is a coefficient, K is more than 0 and less than 0.5, and M is the cross section area of the iron core column at the position of the non-magnetic valve.
3. A core as claimed in claim 1, characterized in that: two magnetic conductive sheets with different magnetic valve shapes are sequentially and alternately laminated;
or one of the magnetic conductive sheets is laminated and then divided into two parts, and the other laminated magnetic conductive sheet is clamped in the middle;
or the two magnetic conductive sheets are evenly divided into a plurality of parts after being laminated and then are alternately arranged.
4. A core as claimed in claim 1, characterized in that: two adjacent magnetic valves with different shapes mutually shield the iron core space of the opposite non-magnetic valve, so that the magnetic flux path of the iron core on the magnetic conductive sheet needs to bypass each magnetic valve and is a bent path.
5. A core as claimed in claim 4, wherein: the curved path is S-shaped, and at least a part of the magnetic flux which travels in a straight line in the radial direction must pass through the air gaps of two adjacent magnetic valves.
6. A core as claimed in claim 1, characterized in that: each group of magnetic valves consists of two magnetic valves with different shapes, wherein one magnetic valve is a hollow cavity, the hollow cavity is hexagonal and is formed by arranging isosceles triangles with the height of L2 on two sides of a rectangle with the length of L1, and the bottom sides of the isosceles triangles are equal to the width of the rectangle and equal to H;
the other type of magnetic valve is a notch, the notch is in a quadrilateral shape and is formed by connecting an isosceles triangle with the length L2 at one side of a rectangle with the length L3, and the bottom edge of the isosceles triangle is equal to the height of the rectangle and is equal to H; and (L1+2 × L2+2 × L3) ═ L, L is the width of the core leg on the core leg plane where the magnetic valve size is marked.
7. A core as claimed in claim 1, characterized in that: each group of magnetic valves consists of two magnetic valves with different shapes, wherein one magnetic valve is in a shape of a left notch pentagon and is a rectangle with a length of L2 combined on the non-notch side of the rectangle with a length of L1;
the other magnetic valve is in a shape of a right notch pentagon, and is a rectangle with a length L2 combined on the non-notch side of a rectangle with a length L1;
wherein: the height of the rectangle of length L1 is H, the height of the rectangle of length L2 is 0.5H; and (2 × L1+ L2) ═ L, L being the width of the core leg on the core leg plane where the magnetic valve size is marked.
8. Iron core reactor, characterized by: comprising a core according to any one of claims 1-7.
9. A method for manufacturing an iron core reactor is characterized in that: a plurality of magnetic valves are arranged on the iron core column where the coil is located, the magnetic valves at least comprise two groups, and the shape of each group of magnetic valves is different;
each group of magnetic valves are processed on different magnetic conductive sheets, and the magnetic conductive sheets are arranged in a stacked mode; the magnetic valves with different shapes are alternately arranged on the magnetic conductive sheet, so that the magnetic flux path of the iron core on the magnetic conductive sheet is a curved path, and at least one path is continuous and uninterrupted;
all the magnetic conductive sheets are arranged in a superposed mode, all the magnetic fluxes which linearly travel in the radial direction of the iron core column where the coil is located pass through at least one air gap of the magnetic valve, and the sum of the lengths of the air gaps of the magnetic valves passing through is equal.
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| CN201911044826.7A CN110729110B (en) | 2019-10-30 | 2019-10-30 | Iron core, iron core reactor and method |
| PCT/CN2020/124495 WO2021083229A1 (en) | 2019-10-30 | 2020-10-28 | Iron core, iron core reactor and method |
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| CN201911044826.7A CN110729110B (en) | 2019-10-30 | 2019-10-30 | Iron core, iron core reactor and method |
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| CN110729110B (en) * | 2019-10-30 | 2020-10-30 | 李晓明 | Iron core, iron core reactor and method |
| CN111462991A (en) * | 2020-04-17 | 2020-07-28 | 株洲市希玛特变电工有限公司 | Reactor based on column iron silicon steel sheet slotting process |
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| US4345229A (en) * | 1978-12-06 | 1982-08-17 | General Electric Company | Amorphous metal ballasts and reactors |
| JPH11307348A (en) * | 1998-04-20 | 1999-11-05 | Hitachi Ltd | Static induction machine |
| JP2010056237A (en) * | 2008-08-27 | 2010-03-11 | Kobe Steel Ltd | Reactor |
| CN201345280Y (en) * | 2009-01-15 | 2009-11-11 | 武汉振源电力设备有限公司 | Stacking air-gap type reactor iron core structure |
| JP5521792B2 (en) * | 2010-06-03 | 2014-06-18 | トヨタ自動車株式会社 | Reactor |
| CN202275694U (en) * | 2011-10-14 | 2012-06-13 | 安徽一天电气技术有限公司 | Magnetic valve type controllable reactor |
| CN109273212B (en) * | 2018-11-02 | 2020-01-10 | 李晓明 | Iron core structure, iron core reactor and method |
| CN110729110B (en) * | 2019-10-30 | 2020-10-30 | 李晓明 | Iron core, iron core reactor and method |
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