A magnetic device and electrical equipment

Abstract

This application provides a magnetic device: the device includes an E-type magnetic core, which comprises a first support base, a second support base, a first side post, a second side post, and a central post. The first and second support bases are arranged parallel to each other, and the first, second, and central posts are vertically arranged between the first and second support bases. The first and second side posts are connected to the edges of the first and second support bases, and the central post is located between the first and second side posts. Windings are wound on the first, second, and central posts, and the windings on the first, second, and second side posts are connected in series, thus solving the problem of high losses in the winding method of magnetic cores in related technologies. This application also provides an electrical device.

Description

Technical Field

[0001] This application relates to the field of electrical technology, and more particularly to a magnetic device and electrical equipment. Background Technology

[0002] In E-type magnetic core applications, the conventional design method utilizes the largest effective cross-sectional area Ae of the center post, winding the core layer by layer. To improve core utilization and maximize window utilization, the number of winding layers is usually increased; however, with the increase in the number of winding layers, the outer windings require more material, resulting in higher losses. Summary of the Invention

[0003] This application provides a magnetic device and electrical equipment that solves the problem of high losses in the winding method of magnetic cores in related technologies.

[0004] The technical solution of this application embodiment is implemented as follows: A magnetic device, the device comprising: The E-type magnetic core includes a first support base, a second support base, a first side post, a second side post, and a central post; The first support base and the second support base are arranged parallel to each other; The first side column, the second side column, and the central column are vertically disposed between the first support base and the second support base; the first side column and the second side column are connected to the edges of the first support base and the second support base; the central column is located between the first side column and the second side column. The first side column, the second side column, and the middle column are all wound with windings, and the windings on the first side column, the middle column, and the second side column are connected in series.

[0005] In the above scheme, the winding adopts a series winding method with the wire entering from the first side post and exiting from the second side post, and is wound on the first side post, the second side post and the middle post.

[0006] In the above scheme, the number of turns of the winding on the first side column is the same as the number of turns of the winding on the second side column.

[0007] In the above scheme, the total inductance corresponding to the winding on the E-type magnetic core is determined by calculating the effective cross-sectional area of ​​the E-type magnetic core, the permeability of the E-type magnetic core, the equivalent magnetic circuit length of the E-type magnetic core, the total number of turns of the winding on the E-type magnetic core, and the target value.

[0008] In the above scheme, the number of turns of the winding on the middle column is greater than the number of turns of the winding on the first side column.

[0009] In the above scheme, the bus length of the winding on the E-type magnetic core is determined based on the number of turns of the winding on the middle column, the number of turns of the winding on the first side column, the size of the E-type magnetic core, and the winding parameters of the winding on the magnetic core.

[0010] In the above scheme, the bus length of the winding on the E-type magnetic core is determined by performing a first calculation on the number of turns of the winding on the middle column, the number of turns of the winding on the first side column, the size of the E-type magnetic core, the thickness of the winding, the interlayer spacing of the winding, and the distance between the target winding and the surface of the E-type magnetic core; wherein, the target winding is the layer of winding closest to the E-type magnetic core in the winding.

[0011] In the above scheme, the magnitude and direction of the current corresponding to the winding on the middle column, the winding on the first side column, and the winding on the second side column are all the same.

[0012] In the above scheme, the number of turns of the winding on the first side column is less than the target number of turns; The target number of turns is determined by performing a second calculation on the number of turns of the winding on the second side post, the number of turns of the winding on the middle post, the size of the E-type magnetic core, the thickness of the winding, the interlayer spacing of the winding, and the distance between the target winding and the E-type magnetic core; wherein, the target winding is the layer of winding closest to the E-type magnetic core in the winding.

[0013] An electrical device comprising the aforementioned magnetic device.

[0014] The magnetic device and electrical equipment provided in this application embodiment include an E-type magnetic core. The E-type magnetic core includes a first support base, a second support base, a first side post, a second side post, and a central post. The first and second support bases are arranged parallel to each other. The first side post, the second side post, and the central post are vertically arranged between the first and second support bases. The first and second side posts are connected to the edges of the first and second support bases. The central post is located between the first and second side posts. Windings are wound on the first side post, the second side post, and the central post. The windings on the center column and the second side column are connected in series. This allows windings to be set on the center column, the first side column, and the second side column of the E-type magnetic core simultaneously. The windings on the first side column, the center column, and the second side column are connected in series sequentially, instead of setting the windings only on the center column as in related technologies. This allows the inductance requirement of the magnetic core to be met through the windings on the first side column, the center column, and the second side column. This solves the problem of high losses caused by the winding method of the magnetic core in related technologies, and achieves effective use of materials while ensuring the utilization rate of the magnetic core. Attached Figure Description

[0015] Figure 1 A schematic diagram of the structure of a magnetic device provided for an embodiment of this application; Figure 2 A schematic diagram of another magnetic device provided for an embodiment of this application; Figure 3 A schematic diagram of the structure of yet another magnetic device provided for an embodiment of this application; Figure 4 A schematic diagram of the structure of a magnetic device provided for another embodiment of this application; Figure 5 A schematic diagram of the winding of a magnetic device provided for an embodiment of this application; Figure 6 A schematic diagram of another magnetic device provided for another embodiment of this application; Figure 7 This is a schematic diagram of another magnetic device provided for another embodiment of this application. Detailed Implementation

[0016] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0017] It should be understood that the phrases "embodiments of this application" or "foreign embodiments" throughout the specification mean that a specific feature, structure, or characteristic related to an embodiment is included in at least one embodiment of this application. Therefore, "embodiments of this application" or "in the foreign embodiments" appearing throughout the specification do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. In the various embodiments of this application, the sequence numbers of the above-described processes do not imply a sequential order of execution; the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application. The sequence numbers of the above-described embodiments are merely descriptive and do not represent the superiority or inferiority of the embodiments.

[0018] It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of this application.

[0019] This application provides a magnetic device, with reference to... Figure 1 As shown, the magnetic device includes: an E-type magnetic core, which includes: a first support base 1, a second support base 2, a first side post 3, a second side post 4, and a central post 5, wherein: The first support base 1 and the second support base 2 are arranged parallel to each other; The first side column 3, the second side column 4 and the middle column 5 are vertically arranged between the first support base 2 and the second support base 3; The first side column 3 and the second side column 4 are connected to the edges of the first support base 1 and the second support base 2; the middle column 5 is located between the first side column 3 and the second side column 4. The first side column 3, the second side column 4, and the middle column 5 are all wound with windings 6, and the windings on the first side column 3, the middle column 5, and the second side column 4 are connected in series.

[0020] Among them, such as Figure 1 As shown, both the first and second side pillars are connected to the edges of the first and second support bases; that is, the first and second side pillars are arranged opposite each other and perpendicular to the first and second support bases. The first side pillar is connected to the first edge of the first and second support bases, and the second side pillar is connected to the second edge of the first and second support bases. Furthermore, the middle pillar is arranged perpendicular to the first and second support bases and is located at the midpoint between the first and second side pillars; that is, the interval between the first side pillar and the middle pillar is the same as the interval between the second side pillar and the middle pillar.

[0021] It should be noted that the windings on the first side column, the windings on the middle column, and the windings on the second side column are connected together in series; that is, the windings on the E-type magnetic core are wound on the first side column, the second side column, and the middle column in such a way that the wire enters from one of the second side column and exits from the other side column.

[0022] In other embodiments of this application, such as Figure 2 As shown, the windings on the E-type magnetic core are arranged in series, with the wires entering from the second side post 4 and exiting from the first side post 3, and are wound on the first side post, the second side post, and the middle post.

[0023] In the E-type magnetic core, the windings are wound starting from the second side post, then on the middle post, and finally on the first side post, exiting from the first side post. The winding L1 on the first side post, the winding L2 on the middle post, and the winding L3 on the second side post are connected in series.

[0024] It should be noted that when the winding L1 on the first side column, the winding L2 on the middle column, and the winding L3 on the second side column are wound on their respective columns, they are all wound according to... Figure 2 As shown, the winding starts from a1 and is wound on the second side post. After completion, it is wound on the middle post and finally wound on the first side post and exits from a2.

[0025] In other embodiments of this application, the number of turns of the winding on the first side post is the same as the number of turns of the winding on the second side post.

[0026] In this application, the number of turns of the winding L1 on the first side column is set. The number of turns of winding L3 on the second side column Similarly, this ensures complete balance between the first and second side pillars. In other embodiments of this application, the total inductance corresponding to the winding on the E-type magnetic core is determined by calculating the effective cross-sectional area of ​​the E-type magnetic core, the permeability of the E-type magnetic core, the equivalent magnetic circuit length of the E-type magnetic core, the total number of turns of the winding on the E-type magnetic core, and the target value.

[0027] Since the total inductance of the winding L1 on the first side post, the winding L2 on the middle post, and the winding L3 on the second side post involves the series and parallel connection of the magnetic circuit, the magnetic circuit calculation method of the equivalent virtual winding can be used to calculate the total inductance L on the E-type magnetic core; specifically, the formula can be used. To calculate the total inductance ;in, Indicates the number of turns in the center column winding. This indicates the permeability of an E-type magnetic core. This indicates the effective cross-sectional area of ​​an E-type magnetic core. This represents the equivalent magnetic circuit length of an E-type magnetic core. It should be noted that the target value can refer to... The result of multiplying by 4.

[0028] In this embodiment, compared to the related art where all the windings are on the center post, this application requires that the windings on the center post in the related art be... Remove the remaining turns of the winding from the center post. The turns are on the center column, that is to say ,So .

[0029] In other embodiments of this application, the inductance of the winding on the first side post is the same as the inductance of the winding on the second side post.

[0030] In this application, the inductance of the winding L1 on the first side post is the same as the inductance of the winding L3 on the second side post, which can further ensure the complete balance between the first side post and the second side post.

[0031] In feasible embodiments of this application, such as Figure 2 As shown, the magnetic circuit of winding L1 on the first side post passes through the first side post and the middle post, and the effective magnetic cross-sectional area of ​​the magnetic circuit outside the middle post is... According to Faraday's law, magnetic flux density B is inversely proportional to effective cross-sectional area Ae. Therefore, the actual utilization of winding L1 on the first side column as the winding on the middle column remains the same. Therefore, the inductance of the winding L1 on the first side column can be calculated separately. ,Right now Similarly, the inductance of winding L3 on the second side column can be calculated. ,Right now Because the number of turns of winding L1 on the first side column... The number of turns of winding L3 on the second side column The same, therefore, .

[0032] Furthermore, since the magnetic field lines of the first side column winding L1 and the second side column winding L3 are not shared (although the middle column shares a channel, the double magnetic cross-sectional area it provides ensures that the magnetic flux density generated by the windings on the first and second side columns is completely consistent at all points on the magnetic core), based on the series connection between the first side column winding L1 and the second side column winding L3, the inductance of the first side column winding L1 is... The inductance of winding L3 on the second side column The series inductance is equal to the inductance. and inductance The sum of the independent inductances, i.e. Due to the composition All the magnetic field lines of the series inductance pass through the winding L2 on the central column, causing the winding L2 to generate a corresponding inductance. Therefore, it is necessary to... By incorporating the series inductance into the magnetic circuit conditions of the middle column, the equivalent number of turns can be calculated, i.e. , The number of turns of the winding removed from the center column in the related art is given; therefore, it can be obtained that the number of turns of the winding on the first side column and the number of turns of the winding on the second side column are the same as the number of turns removed from the center column in the related art.

[0033] It should be noted that, compared to the winding arrangement in related technologies where windings are only placed on the middle column, the total number of turns in the winding arrangement of this application is the same as that in related technologies where windings are only placed on the middle column. However, because the length of the windings on the first and second side columns is less than the length of the outer windings on the middle column, that is, while the number of turns in the winding arrangement of this application is the same as that in related technologies where windings are only placed on the middle column, the bus length of the windings on the E-type magnetic core in this application is less than that in related technologies. Furthermore, the windings on the E-type magnetic core in this application can achieve the same inductance as those in related technologies. Therefore, this application significantly reduces costs and losses, and greatly improves efficiency.

[0034] In other embodiments of this application, the number of turns of the winding on the middle column is greater than the number of turns of the winding on the first side column.

[0035] Specifically, the number of turns in the winding on the middle column is greater than the number of turns in the winding on the second side column. In one feasible embodiment, the number of turns in the winding on the middle column can be much greater than the number of turns in the winding on the first side column; of course, the number of turns in the winding on the middle column can also be much greater than the number of turns in the winding on the second side column.

[0036] In other embodiments of this application, the bus length of the winding on the E-type magnetic core is determined based on the number of turns of the winding on the middle column, the number of turns of the winding on the first side column, the size of the E-type magnetic core, and the winding parameters of the winding on the E-type magnetic core.

[0037] The winding parameters refer to parameters used when winding a coil on an E-type magnetic core. In one feasible embodiment of this application, the winding parameters may include one or more of the following: the thickness of the winding, the interlayer spacing of the winding, and the distance between the target winding and the surface of the E-type magnetic core; wherein the target winding is the layer of winding closest to the E-type magnetic core.

[0038] Specifically, the main winding length on the E-type magnetic core can be determined based on the number of turns in the winding on the center post, the number of turns in the winding on the first side post, the size of the E-type magnetic core, the thickness of the winding, the interlayer spacing of the winding, and the distance between the target winding and the surface of the E-type magnetic core. It should be noted that the main winding length on the E-type magnetic core is affected by the number of turns in the winding on the center post, the number of turns in the winding on the first side post, the number of turns in the winding on the second side post, the size of the E-type magnetic core, and the winding parameters.

[0039] In other embodiments of this application, the bus length of the winding on the E-type magnetic core is determined by performing a first calculation on the number of turns of the winding on the middle column, the number of turns of the winding on the first side column, the size of the E-type magnetic core, the thickness of the winding, the interlayer spacing of the winding, and the distance between the target winding and the surface of the E-type magnetic core.

[0040] The target winding is the layer of winding closest to the E-type magnetic core in the winding.

[0041] In the embodiments of this application, such as Figure 3 The image shown is a front view of the E-type magnetic core provided in this application, as follows: Figure 4 The image shown is a side view of an E-type magnetic core; furthermore, the dimensions of an E-type magnetic core can be as follows: Figure 3 and Figure 4 As shown; the bus length of the winding on the E-type magnetic core can be calculated using the following formula, i.e. ;in, This indicates the bus length of the windings on an E-type magnetic core. This indicates the thickness or wire diameter of the windings on an E-type magnetic core. Indicates the interlayer spacing of the windings on an E-type magnetic core. This indicates the distance between the target winding in the winding on the E-type magnetic core and the surface of the E-type magnetic core. This distance includes the frame thickness of the E-type magnetic core and the assembly clearance of the frame.

[0042] In other embodiments of this application, the magnitude and direction of the current corresponding to the winding on the middle column, the winding on the first side column, and the winding on the second side column are all the same.

[0043] Specifically, in this application, the windings on the central column, the first side column, and the second side column of the E-type magnetic core are all connected in series, and as shown... Figure 2 The diagram shows a winding that enters at point a1 and exits at point a2. In this case, the magnitude and direction of the current in the windings on the center column, the first side column, and the second side column of the E-type magnetic core are all the same. In one feasible embodiment, such as... Figure 2 As shown, the direction of the current can be from a1 to a2.

[0044] In other embodiments of this application, the number of turns of the winding on the first side post is less than the target number of turns.

[0045] The target number of turns is determined by performing a second calculation on the number of turns of the winding on the second side post, the number of turns of the winding on the middle post, the size of the E-type magnetic core, the thickness of the winding, the layer spacing of the winding, and the distance between the target winding and the E-type magnetic core; the target winding is the layer of winding closest to the E-type magnetic core in the winding.

[0046] In this embodiment, based on the actual winding process, the number of turns removed from the center column in related technologies is necessarily the number of turns with the longest single-turn wire consumption. Therefore, it is only necessary to compare the length of the outermost winding on the center column in the related technologies with the length of the innermost winding on the first or second side column in this embodiment. Simultaneously, since the winding coil tends to become circular as the number of layers increases during actual winding, calculations show that the approaching circle is the circumcircle, and its circumference is close to that of a square. Therefore, if... Figure 5 As shown in this application, the winding length is calculated using the perimeter of a square; specifically, by... Figure 5 It is known that the length of a single-turn winding is directly proportional to the length of a single-layer winding, and the multiple of the two is a constant equal to the number of turns in a single layer. Therefore, under the condition that the number of turns in each layer is the same, the total length and proportion of all turns can be obtained simply by using the length of a single turn in each layer; that is, the total length of the winding on the center column in related technologies can be calculated using the formula for the summation of an arithmetic series. The sum of the bus length of the winding on the first side post and the bus length of the winding on the second side post in this application scheme Based on the fact that the bus length of the winding on the middle column in related technologies is greater than the sum of the bus lengths of the windings on the first side column and the second side column in this application, it can be obtained that... .

[0047] In one feasible embodiment of this application, the target number of turns can be determined using the formula... The results are obtained by calculating the number of turns of the winding on the second side post, the number of turns of the winding on the middle post, the size of the E-type magnetic core, the thickness of the winding, the interlayer spacing of the winding, and the distance between the target winding and the E-type magnetic core.

[0048] In another feasible embodiment of this application, the E-type magnetic core in this application can be applied to inductors, reactors, transformers, and instrument transformers, etc.

[0049] In other embodiments of this application, since magnetic field lines preferentially select the shortest loop, the effective le value of the magnetic core in the winding scheme of the magnetic core in related technologies is slightly shorter than that of the central axis loop, and the magnetic flux density of the side posts will show a phenomenon where the inner side is significantly higher than the outer side; this phenomenon forms a positive feedback with the thermal resistance distribution of the magnetic element, resulting in a higher temperature rise and more difficulty in heat dissipation on the inner side of the magnetic core. However, as Figure 6 As shown, in this application, part of the excitation of the E-type magnetic core is transferred from the winding on the central column to the winding on the first side column and the second side column. This allows each point on the magnetic cross-sectional area of ​​the first and second side columns of the E-type magnetic core to be simultaneously excited by the winding, effectively improving the situation where the difference in magnetic flux density at each point in the magnetic cross-sectional area decreases, and even the magnetic flux density at each point in the magnetic cross-sectional area can tend to be balanced.

[0050] In other embodiments of this application, an E-type magnetic core of EEXX / XX / XX can be used, the material of the E-type magnetic core is PC40, and the wire diameter of the winding on the E-type magnetic core is... Let's take mm as an example for explanation; such as Figure 7The winding on the central column shown has 90 turns and 5 layers; the windings on the first and second side columns both have 36 turns and 2 layers. Calculations show the winding length is 10.119m, resulting in a 2.345% reduction in winding length, material consumption, and impedance. Furthermore, if the winding on the central column has 108 turns and 6 layers, and the windings on the first and second side columns both have 18 turns and 1 layer, the winding length is 10.003m, resulting in a 3.464% reduction in winding length, material consumption, and impedance. Clearly, the winding method of the E-type magnetic core in this application significantly reduces impedance and material consumption. Moreover, in the same constant temperature, humidity, and electrical parameter environment, the structure of the E-type magnetic core in this application alters the location of the highest temperature point and lowers the highest temperature point of the magnetic element by 7-10°C. Therefore, the magnetic device in this application, while maintaining a constant inductance, effectively reduces the cost of the inductor, transformer, or reactor, reduces losses, and improves temperature rise.

[0051] The magnetic device provided in the embodiments of this application can simultaneously provide windings on the central column, the first side column, and the second side column of the E-type magnetic core, and the windings on the first side column, the central column, and the second side column are connected in series, instead of providing windings only on the central column as in related technologies. This can achieve the required inductance of the magnetic core through the windings on the first side column, the central column, and the second side column, solving the problem of high losses caused by the winding method of the magnetic core in related technologies, and ensuring the utilization rate of the magnetic core while achieving effective use of materials.

[0052] Embodiments of this application provide an electrical device that may include the magnetic device provided in the embodiments of this application.

[0053] In one feasible embodiment of this application, the electrical device may include a magnetic element using the magnetic device provided in this application; the magnetic element may include an inductor (i.e., a reactor), a transformer, and a current transformer, etc.; the inductor may include a differential mode inductor and a common mode inductor, etc.; the transformer may include a high-frequency transformer and a power frequency transformer (i.e., a low-frequency transformer), etc.; the current transformer may include a current transformer and a Hall sensor, etc.

[0054] In the description of this application, the terms "certain embodiments," "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," "some examples," or "other embodiments of this application," etc., refer to specific features, structures, materials, or characteristics described in connection with the described embodiments or examples, which are included in at least one embodiment or example of this application. In this application, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0055] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected" or "linked" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a mechanical connection, an electrical connection, or a connection that allows communication between the components; it can refer to a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0056] The components described above as separate parts may or may not be physically separate. The components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units may be selected to achieve the purpose of the embodiments of this application, depending on actual needs.

[0057] In addition, each functional unit in the various embodiments of this application can be integrated into one processing module, or each unit can be a separate unit, or two or more units can be integrated into one unit.

[0058] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the stated features. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0059] The features disclosed in the several device embodiments provided in this application can be arbitrarily combined without conflict to obtain new product embodiments.

[0060] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A magnetic device, characterized in that, The device includes: The E-type magnetic core includes a first support base, a second support base, a first side post, a second side post, and a central post; The first support base and the second support base are arranged parallel to each other; The first side column, the second side column, and the central column are vertically disposed between the first support base and the second support base; the first side column and the second side column are connected to the edges of the first support base and the second support base; the central column is located between the first side column and the second side column. The first side column, the second side column, and the middle column are all wound with windings, and the windings on the first side column, the middle column, and the second side column are connected in series.

2. The apparatus according to claim 1, characterized in that, The winding adopts a series winding method with the wire entering from the second side post and exiting from the first side post, and is wound on the first side post, the second side post and the middle post.

3. The apparatus according to claim 1, characterized in that, The number of turns of the winding on the first side post is the same as the number of turns of the winding on the second side post.

4. The apparatus according to claim 3, characterized in that, The total inductance of the windings on the E-type magnetic core is determined by calculating the effective cross-sectional area of ​​the E-type magnetic core, the permeability of the E-type magnetic core, the equivalent magnetic circuit length of the E-type magnetic core, the total number of turns of the windings on the E-type magnetic core, and the target value.

5. The apparatus according to claim 1, characterized in that, The number of turns of the winding on the middle column is greater than the number of turns of the winding on the first side column.

6. The apparatus according to claim 1, characterized in that, The bus length of the winding on the E-type magnetic core is determined based on the number of turns of the winding on the center column, the number of turns of the winding on the first side column, the size of the E-type magnetic core, and the winding parameters of the winding on the E-type magnetic core.

7. The apparatus according to claim 6, characterized in that, The bus length of the winding on the E-type magnetic core is determined by performing a first calculation on the number of turns of the winding on the middle column, the number of turns of the winding on the first side column, the size of the E-type magnetic core, the thickness of the winding, the interlayer spacing of the winding, and the distance between the target winding and the surface of the E-type magnetic core; wherein, the target winding is the layer of winding closest to the E-type magnetic core in the winding.

8. The apparatus according to claim 1, characterized in that, The magnitude and direction of the current corresponding to the windings on the central column, the first side column, and the second side column are all the same.

9. The apparatus according to claim 1, characterized in that, The number of turns in the winding on the first side column is less than the target number of turns; The target number of turns is determined by performing a second calculation on the number of turns of the winding on the second side post, the number of turns of the winding on the middle post, the size of the E-type magnetic core, the thickness of the winding, the interlayer spacing of the winding, and the distance between the target winding and the E-type magnetic core; wherein, the target winding is the layer of winding closest to the E-type magnetic core in the winding.

10. An electrical device, characterized in that, The electrical equipment includes the magnetic device as described in any one of claims 1 to 9.

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