Magnetic device

Abstract

The utility model provides a magnetic device, which comprises a winding, two cover plates and two middle columns, and the two middle columns are arranged at intervals along a first direction. The two cover plates are connected to the two ends of the middle column in the axial direction respectively. The first direction is orthogonal to the axial direction; the winding is provided with two connected coils, the coils are arranged on the middle columns in a sleeving mode and correspond to the middle columns in a one-to-one mode, and the directions of magnetic fields generated by the two coils are opposite in the axial direction in space. Under the condition of the same length, width and height, the sensing value of the magnetic device is higher. By arranging the two cover plates, the two middle columns and the winding, a complete magnetic circuit is achieved, side columns do not need to be arranged, and the middle columns do not need to be centered relative to the two side columns, so that the assembling process is simple, the assembling precision requirement can be lowered, and the machining difficulty is lowered; meanwhile, the space utilization rate can be improved. In addition, the two middle columns are both arranged in the coil and wound by the coil, so that the heat dissipation conditions of the two middle columns are the same, and the condition of heat accumulation is avoided.

Description

TECHNICAL FIELD

[0001] The utility model belongs to power conversion device field, especially relate to a magnetic device. BACKGROUND

[0002] As an indispensable device in power electronic converter, the improvement of the function and performance of the magnetic device is of great significance to improve the overall efficiency, power density and reliability of the power electronic converter. The design of the magnetic device needs to meet multiple requirements such as circuit, magnetic circuit, heat dissipation and space structure in limited space. Good magnetic device design can optimize the overall performance of the converter and meet the needs of different application scenarios.

[0003] In the related art, high-power single-winding magnetic devices mostly use EE-shaped magnetic cores. The EE-shaped magnetic core includes a magnetic core column, two magnetic core side columns, and two magnetic core upper and lower covers. The magnetic core column is used to wind the coil winding, and the magnetic flux of the two magnetic core side columns is equal to the magnetic flux of the magnetic core column after superposition. However, the heat dissipation conditions of the magnetic core column and the magnetic core side column are quite different, resulting in serious heat accumulation. In addition, the magnetic core column and the coil winding occupy a large space, and the space utilization rate is low. Furthermore, in the processing of the magnetic device, in order to ensure the symmetry of the magnetic circuit, the magnetic core column needs to be installed centrally relative to the two magnetic core side columns, which requires high assembly and is not conducive to reducing production costs. SUMMARY

[0004] The technical purpose of the utility model is to provide a magnetic device, which aims to solve the technical problems of serious heat accumulation, low space utilization rate and high assembly requirement of the single-winding magnetic device in the related art.

[0005] To solve the above technical problems, the utility model is realized in the following way. A magnetic device includes a winding, two cover plates and two columns. The two columns are spaced apart along a first direction. The two cover plates are respectively connected to the two ends of the columns along an axial direction. The first direction is orthogonal to the axial direction. The winding has two coils connected in series. The coils are sleeved on the columns, and the coils correspond to the columns one by one. The magnetic fields generated by the two coils are opposite in space along the axial direction.

[0006] Further, in some embodiments, the two coils are formed by a copper wire in series, so that the winding includes two coils sleeved on the two columns and a connecting structure connected between the two coils.

[0007] Further, in some embodiments, the outer periphery of the column is at least partially arc-shaped, and the copper wire is flat.

[0008] Further, in some embodiments, the two coils are spaced apart by the connecting structure, and a heat dissipation air duct is formed between the two connecting structures.

[0009] Further, in some embodiments, the connecting structure is in an arc shape.

[0010] Further, in some embodiments, the winding further comprises a first pin and a second pin, and the two coils are a first coil and a second coil respectively; along the axial direction of the column, the first coil is wound from the first pin to one of the columns from top to bottom and connected to one end of the connecting structure, and the second coil is wound from the other end of the connecting structure to the other column from bottom to top and connected to the second pin.

[0011] Further, in some embodiments, the winding further comprises a first pin and a second pin, and the two coils are a first coil and a second coil respectively; along the axial direction of the column, the first coil is wound from the first pin to one of the columns from top to bottom and connected to one end of the connecting structure, and the second coil is wound from the other end of the connecting structure to the other column from bottom to top and connected to the second pin.

[0012] Further, in some embodiments, along a second direction, the connecting structure is connected to one end of the two coils close to the first pin and the second pin; the second direction is orthogonal to the axial direction and orthogonal to the first direction.

[0013] Further, in some embodiments, along a second direction, the connecting structure is connected to one end of the two coils away from the first pin and the second pin; the second direction is orthogonal to the axial direction and orthogonal to the first direction.

[0014] Further, in some embodiments, the winding comprises two pins corresponding to the two coils; the two coils have outward peripheral sides, and along the axial direction, the periphery of the cover plate is flush with the peripheral sides of the two coils; the pins are led out from the coils to the side wall of the cover plate.

[0015] Further, in some embodiments, the magnetic device further comprises a panel, which is arranged on one side of one of the cover plates away from the column, and the panel is provided with two positioning holes, the pins are arranged in the positioning holes, and the pins and the positioning holes correspond one by one.

[0016] The magnetic device in the utility model compared with related technical, have beneficial effect in:

[0017] In the utility model, two middle columns are arranged at intervals along the first direction, the first direction is orthogonal to the axial direction of the middle column, the winding comprises two connected coils, the two coils are respectively sleeved on the two middle columns, and the magnetic field directions generated by the two coils are opposite in space along the axial direction, so that the two coils are in the same direction of the magnetic circuit, so that the magnetic flux cannot be cancelled out, that is, the double-coil winding can be realized. Under the condition of the same length, width and height, the total number of turns of the double coil is higher, so that the inductance of the magnetic device of the utility model is higher. At the same time, the two ends of the middle column are respectively provided with cover plates, so that the complete magnetic circuit of the magnetic flux in the middle column is provided. That is to say, the utility model, by arranging two cover plates, two middle columns and a winding, a complete magnetic circuit can be realized, without the need of arranging side columns, and without the need of requiring the middle column to be centered relative to the two side columns, only the two middle columns are arranged at intervals along the first direction, so that the assembly process is simple, the assembly precision requirement can be reduced, the processing difficulty is reduced, and the space utilization rate can be improved. In addition, the two middle columns are arranged inside the coil and are wound by the coil, so that the heat dissipation conditions of the two middle columns are the same, and the heat aggregation condition does not occur. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to these drawings without creating labor.

[0019] Figure 1 It is the partial structure schematic view of the magnetic device in the embodiment of the utility model;

[0020] Figure 2 It is the side view of the magnetic device in the embodiment of the utility model;

[0021] Figure 3 It is the explosion view of the magnetic device in the embodiment of the utility model;

[0022] Figure 4 It is the equivalent electrical connection relationship diagram of the magnetic device in the embodiment of the utility model;

[0023] Figure 5 It is the structure schematic view of the winding in the first embodiment of the utility model;

[0024] Figure 6 It is the structure schematic view of the winding in the second embodiment of the utility model;

[0025] Figure 7 It is the structure schematic view of the winding in the third embodiment of the utility model;

[0026] Figure 8 is a structural schematic diagram of the winding in the fourth embodiment of the present application.

[0027] In the drawings, the reference signs represent: 1, winding; 11, coil; 12, connecting structure; 13, pin; 2, middle column; 3, heat dissipation air duct; 4, cover plate; 5, panel; 51, positioning hole. DETAILED DESCRIPTION

[0028] The embodiments of the present application are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0029] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "first direction", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "circumferential", "radial" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0030] In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0031] Please refer to Figures 1 to 8 The embodiment of the present application provides a magnetic device, which comprises a winding 1, two cover plates 4 and two middle columns 2, the two middle columns 2 are arranged in a first direction; the two cover plates 4 are respectively connected to the two ends of the middle column 2 along the axial direction; the first direction is orthogonal to the axial direction; the winding 1 has two connected coils 11, the coil 11 is sleeved on the middle column 2, the coil 11 corresponds to the middle column 2 one by one, and the magnetic field directions generated by the two coils 11 are opposite in space along the axial direction.

[0032] In the embodiment of the utility model, two middle columns 2 are arranged along the first direction, and the first direction is orthogonal to the axial direction of the middle column 2; the winding 1 comprises two coils 11 connected with each other, the two coils 11 are respectively sleeved on the two middle columns 2, and the magnetic field directions generated by the two coils 11 are opposite in space along the axial direction, so that the two coils 11 are in the same direction of the magnetic circuit, thus, the magnetic flux can not be cancelled out, and the double-coil winding 1 can be realized. Under the condition of the same length, width and height, the total number of turns of the double coil is higher, and therefore, the inductance of the magnetic device of the embodiment of the utility model is higher. At the same time, the two ends of the middle column 2 are respectively provided with cover plates 4, so that the complete magnetic circuit for the magnetic flux in the middle column 2 can be provided. That is to say, in the embodiment of the utility model, by arranging two cover plates 4, two middle columns 2 and one winding 1, the complete magnetic circuit can be realized, and it is not necessary to arrange side columns, and it is not necessary to require the middle column 2 to be centered with respect to the two side columns, but it is only necessary to arrange the two middle columns 2 along the first direction, so that the assembly process is simple, the assembly precision requirement can be reduced, the processing difficulty can be reduced, and the space utilization can be improved. In addition, the two middle columns 2 are arranged inside the coil 11 and are wound by the coil 11, and therefore, the heat dissipation conditions of the two middle columns 2 are the same, and the heat aggregation does not occur.

[0033] It can be understood that the axial direction is the direction parallel to the Z axis in the figure, and the first direction is orthogonal to the axial direction, and therefore, the first direction can be the length direction or the width direction of the middle column 2.

[0034] Further, referring to Figures 1 to 8 In some embodiments, the two coils 11 are formed by a copper wire in series, so that the winding 1 comprises two coils 11 sleeved on the two middle columns 2 and a connecting structure 12 connected between the two coils 11.

[0035] Specifically, the two coils 11 can be sequentially wound on the two middle columns 2 by a copper wire, that is, the two coils 11 are not spliced. In this way, the winding 1 comprises two coils 11 and a connecting structure 12, and the two coils 11 and the connecting structure 12 are formed by a copper wire. One end of the connecting structure 12 is connected to the first end of one of the two coils 11, and the other end is connected to the end of the other coil 11. And since the magnetic field directions generated by the two coils 11 are opposite along the axial direction, the winding direction of the two coils 11 needs to be opposite during the process of winding the copper wire on the middle column 2 to form the two coils 11. For example, the winding direction of one of the two coils 11 is counterclockwise, and the winding direction of the other coil 11 is clockwise. And the magnetic field directions generated by the two coils 11 are opposite along the axial direction, that is, the two coils 11 are equivalent to being arranged in series, so that the equivalent electrical connection relationship as shown in Figure 4 is formed, so that under the condition of the same length, width and height, the inductance of the magnetic device of the embodiment of the utility model is higher.

[0036] Further, referring to Figures 1 to 8 In some embodiments, the outer periphery of the middle column 2 is at least partially arc-shaped, and the copper wire is flat.

[0037] Specifically, the outer periphery of the middle column 2 is at least partially arc-shaped, and the coil 11 is a flat copper wire. The deformation of the flat copper wire is small at the arc-shaped structure, so that when the copper wire is wound around the outer periphery of the middle column 2, the deformation of the flat copper wire is small when the copper wire passes through the arc-shaped structure of the middle column 2, that is, the flat copper wire has higher stability, which is conducive to the winding process of the copper wire along the middle column 2, so that the double-coil winding 1 is easy to be machined.

[0038] In some specific embodiments, the outer diameter of the middle column 2 and the inner diameter of the coil 11 are matched, and the shape of the coil 11 is adapted to the shape of the outer periphery of the middle column 2. The two middle columns 2 have the same structure, and the middle column 2 can be an elliptical magnetic column. Therefore, the two ends of the middle column 2 along the first direction are semicircular column-shaped. Therefore, when the copper wire is wound around the outer periphery of the middle column 2, the deformation of the flat copper wire at the bending part is small, that is, the flat copper wire has higher stability, which is conducive to the winding process of the copper wire along the middle column 2, so that the double-coil winding 1 is easy to be machined.

[0039] Further, referring to Figure 2 and Figures 5 to 8 In some embodiments, the two coils 11 are spaced apart by the connecting structure 12, and the heat dissipation air duct 3 is formed between the two connecting structures 12.

[0040] Specifically, there is a space between the two coils 11, and the connecting structure 12 is located at the space. The two middle columns 2 extend along the axial direction, and the two coils 11 are wound around the middle column 2, that is, the two coils 11 also extend along the axial direction. Therefore, the space is actually a space extending along the axial direction, so that even if the connecting structure 12 is located at the space, it does not affect the formation of the space as the heat dissipation air duct 3. Therefore, both sides of each coil 11 can be ventilated and cooled, so that the cooling effect can be improved, and the maximum design electric density can be higher. Furthermore, the space utilization rate of the structure of the two coils 11 is high, and there is no space waste except for the necessary air duct.

[0041] Further, in some embodiments, the connecting structure 12 is arc-shaped.

[0042] Specifically, the connecting structure 12 is led out from the end of one coil 11 and extends to the start of the other coil 11, thereby realizing the connection of the two coils 11 and realizing the winding of the double coils by one copper wire. During winding, the copper wire at the end of the first coil 11 can be bent by 90° in the direction away from the coil 11 to start winding the second coil 11, and the copper wire located between the two coils 11 is the connecting structure 12. In this way, the connecting structure 12 is in an arc shape, thereby facilitating the winding of the copper wire between the two middle columns 2, and, under the premise that the two coils 11 are completely wound, the size of the copper wire required by the connecting structure 12 is minimized. In addition, the two coils 11 are connected by the connecting structure 12, so that the distance between the two coils 11 can be determined according to the size of the copper wire required by the connecting structure 12, so that the two coils 11 will not be dislocated or relatively moved, improving the stability.

[0043] Further, the two coils 11 are connected by the connecting structure 12. In actual use, according to the different pin 13 out pin modes and the connecting forms of the connecting structure 12, there are four specific winding 1 structures, which are as follows.

[0044] In some embodiments, please refer to Figure 5 , the winding 1 further comprises a first pin and a second pin, and the two coils 11 are a first coil and a second coil respectively; along the axial direction of the middle column 2, the first coil is wound on one of the middle columns 2 from top to bottom and connected to one end of the connecting structure 12, and the second coil is wound on the other middle column 2 from bottom to top and connected to the second pin. And along the second direction, the connecting structure 12 is connected to one end of the two coils 11 close to the first pin and the second pin; the second direction is orthogonal to the axial direction and orthogonal to the first direction.

[0045] Specifically, the first pin is connected to one end of the copper wire, the copper wire is wound on one of the middle columns 2 in a counterclockwise direction and from top to bottom, and finally completes the winding of the first coil at the end of the middle column 2 close to the first pin in the second direction; then the connecting structure 12 is led out; then, at the end of the connecting structure 12 away from the first coil, the copper wire is wound on the other middle column 2 in a clockwise direction and from bottom to top, and finally completes the winding of the second coil at the end of the middle column 2 close to the first pin in the second direction; then the second pin is connected to the end of the second coil. In this way, a double-coil winding 1 can be assembled to the two middle columns 2. In this way, the pins are out of the coils 11 (the pins are out of the coils 11 in the axial direction), and the connecting structure 12 (the connection between the two coils 11) is close to the pin position.

[0046] It can be understood that the second direction is orthogonal to the axial direction and orthogonal to the first direction, and the first direction is orthogonal to the axial direction, so the first direction can be the length direction or the width direction of the middle column 2, and the second direction can be the width direction or the length direction of the middle column 2.

[0047] In some embodiments, referring to Figure 6 , the winding 1 further comprises a first pin and a second pin, and the two coils 11 are respectively a first coil and a second coil; along the axial direction of the middle column 2, the first coil is wound from the first pin to one of the middle columns 2 from top to bottom and connected to one end of the connecting structure 12, and the second coil is wound from the other end of the connecting structure 12 to the other middle column 2 from bottom to top and connected to the second pin. And along the second direction, the connecting structure 12 is connected to one end of the two coils 11 away from the first pin and the second pin; the second direction is orthogonal to the axial direction and orthogonal to the first direction.

[0048] Specifically, the first pin is connected to one end of the copper wire, the copper wire is wound on one of the middle columns 2 in a counterclockwise direction, and is wound from top to bottom, and finally completes the winding of the first coil at the end of the middle column 2 away from the first pin in the second direction; then the connecting structure 12 is led out; then, at the end of the connecting structure 12 away from the first coil, the copper wire is wound on the other middle column 2 in a clockwise direction, and is wound from bottom to top, and finally completes the winding of the second coil at the end of the middle column 2 away from the first pin in the second direction; and the second pin is connected to the end of the second coil. In this way, a double-coil winding 1 can be assembled to two middle columns 2. In this way, the upper pin of the coil 11 (the upper pin of the coil 11 along the axial direction) is away from the pin position, and the connecting structure 12 (the connection of the two coils 11) is away from the pin position.

[0049] It can be understood that the second direction is orthogonal to the axial direction and orthogonal to the first direction, and the first direction is orthogonal to the axial direction, so the first direction can be the length direction or the width direction of the middle column 2, and the second direction can be the width direction or the length direction of the middle column 2.

[0050] In some embodiments, referring to Figure 7 , the winding 1 further comprises a first pin and a second pin, and the two coils 11 are respectively a first coil and a second coil; along the axial direction of the middle column 2, the first coil is wound from the first pin to one of the middle columns 2 from top to bottom and connected to one end of the connecting structure 12, and the second coil is wound from the other end of the connecting structure 12 to the other middle column 2 from bottom to top and connected to the second pin. And along the second direction, the connecting structure 12 is connected to one end of the two coils 11 away from the first pin and the second pin; the second direction is orthogonal to the axial direction and orthogonal to the first direction.

[0051] Specifically, the first pin is connected to one end of the copper wire, the copper wire is wound on one of the middle columns 2 in a counterclockwise direction and from bottom to top, and finally the winding of the first coil is completed at one end of the middle column 2 in the second direction close to the first pin; then the connecting structure 12 is led out; then, at one end of the connecting structure 12 away from the first coil, the copper wire is wound on the other middle column 2 in a clockwise direction and from top to bottom, and finally the winding of the second coil is completed at one end of the middle column 2 in the second direction away from the first pin; and the second pin is connected to the end of the second coil. In this way, a double-coil winding 1 can be assembled and connected to two middle columns 2. In this way, the lower pin (the lower pin of the coil 11 in the axial direction) is shown, and the connecting structure 12 (the connection of the two coils 11) is close to the pin position.

[0052] Understandably, the second direction is orthogonal to the axial direction and orthogonal to the first direction, and the first direction is orthogonal to the axial direction, so the first direction can be the length direction or the width direction of the middle column 2, and the second direction can be the width direction or the length direction of the middle column 2.

[0053] In some embodiments, referring to Figure 8 , the winding 1 further comprises a first pin and a second pin, and the two coils 11 are respectively a first coil and a second coil; along the axial direction of the middle column 2, the first coil is wound on one of the middle columns 2 from the first pin from bottom to top and connected to one end of the connecting structure 12, and the second coil is wound on the other middle column 2 from the other end of the connecting structure 12 from top to bottom and connected to the second pin. And along the first direction of the middle column 2, the connecting structure 12 is connected to one end of the two coils 11 away from the first pin and the second pin; the second direction is orthogonal to the axial direction and orthogonal to the first direction.

[0054] Specifically, the first pin is connected to one end of the copper wire, the copper wire is wound on one of the middle columns 2 in a counterclockwise direction and from bottom to top, and finally the winding of the first coil is completed at one end of the middle column 2 in the second direction away from the first pin; then the connecting structure 12 is led out; then, at one end of the connecting structure 12 away from the first coil, the copper wire is wound on the other middle column 2 in a clockwise direction and from top to bottom, and finally the winding of the second coil is completed at one end of the middle column 2 in the second direction away from the first pin; and the second pin is connected to the end of the second coil. In this way, a double-coil winding 1 can be assembled and connected to two middle columns 2. In this way, the lower pin (the lower pin of the coil 11 in the axial direction) is shown, and the connecting structure 12 (the connection of the two coils 11) is close to the pin position.

[0055] Understandably, the second direction is orthogonal to the axial direction and orthogonal to the first direction, and the first direction is orthogonal to the axial direction, so the first direction can be the length direction or the width direction of the middle column 2, and the second direction can be the width direction or the length direction of the middle column 2.

[0056] Further, in some embodiments, the winding 1 comprises two pins 13 corresponding to two coils 11; the two coils 11 have four circumferential sides facing outward, along the axial direction, the circumference of the cover plate 4 is flush with the four circumferential sides of the two coils 11; the pins 13 are led out from the coils 11 to the side wall of the cover plate 4.

[0057] Specifically, one of the cover plates 4 is located at the same end of the two columns 2 along the axial direction, and the other cover plate 4 is located at the other end of the two columns 2 along the axial direction. The coils 11 are wound outside the columns 2, and the shape of the coils 11 matches the shape of the columns 2. The circumference of the cover plate 4 can be processed so that the cover plate 4 is adapted to the shape of the coils 11, or so that the projected area of the cover plate 4 along the axial direction is slightly larger than the projected area of the two coils 11 and the space between the two coils 11, that is, so that the circumference of the cover plate 4 is flush with the four circumferential sides of the two coils 11, thereby reducing the amount of material, reducing the cost of raw materials and weight of the magnetic device. In addition, the pins 13 are arranged parallel to the axial direction, so that the circumference of the cover plate 4 is arranged flush with the four circumferential sides of the coils 11, thereby facilitating the pins 13 of the double-coil winding 1 to be led out, providing space for fixing the pins 13.

[0058] It can be understood that the two pins 13 are the first pin and the second pin described above.

[0059] Further, in some embodiments, referring to Figure 3 , the magnetic device further comprises a panel 5 arranged on the side of one of the cover plates 4 away from the column 2, the panel 5 is provided with two positioning holes 51, and the pins 13 are arranged in the positioning holes 51, and the pins 13 and the positioning holes 51 correspond one by one.

[0060] Specifically, the projection of the panel 5 along the axial direction is larger than the projection of the cover plate 4 along the axial direction, so that the panel 5 has a flange protruding from the cover plate 4, and the positioning holes 51 can be opened at the flange, and the pins 13 can be arranged in the positioning holes 51, thereby realizing the connection of the pins 13. In addition, the two pins 13 are arranged in a spaced manner, so that the two positioning holes 51 are arranged adaptively.

[0061] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0062] The above is the description of the technical scheme provided by the present application. For those skilled in the art, according to the idea of the embodiments of the present application, there will be changes in specific implementation and application range. In summary, the content of the specification should not be understood as a limitation of the present application.

Claims

1. A magnetic device, characterized by, The winding, two cover plates and two middle columns, The two middle columns are arranged in a first direction, and the two cover plates are respectively connected to the two ends of the middle columns along an axial direction. The first direction is orthogonal to the axial direction. The winding has two coils connected to each other, and the coils are arranged on the middle columns. The coils correspond to the middle columns one by one, and the magnetic field directions generated by the two coils are opposite in space along the axial direction. The two coils are formed by a copper wire in series, so that the winding includes two coils arranged on the two middle columns and a connecting structure connected between the two coils. The outer periphery of the middle column is at least partially arc-shaped, and the copper wire is flat. The two coils are arranged in a spaced manner through the connecting structure, and a heat dissipation air duct is formed between the two connecting structures. The connecting structure is arc-shaped.

2. The magnetic device of claim 1, wherein, The winding further includes a first pin and a second pin, and the two coils are a first coil and a second coil. In the axial direction of the middle column, the first coil is wound on one of the middle columns from the first pin downward and connected to one end of the connecting structure, and the second coil is wound on the other middle column from the other end of the connecting structure upward and connected to the second pin. Alternatively, in the axial direction of the middle column, the first coil is wound on one of the middle columns from the first pin upward and connected to one end of the connecting structure, and the second coil is wound on the other middle column from the other end of the connecting structure downward and connected to the second pin.

3. The magnetic device of claim 2, wherein, In a second direction, the connecting structure is connected to one end of the two coils close to the first pin and the second pin. The second direction is orthogonal to the axial direction and orthogonal to the first direction.

4. The magnetic device of claim 2, wherein, In a second direction, the connecting structure is connected to one end of the two coils away from the first pin and the second pin. The second direction is orthogonal to the axial direction and orthogonal to the first direction.

5. The magnetic device of claim 1, wherein, The winding includes two pins corresponding to the two coils. The two coils have four outer sides in the axial direction. The periphery of the cover plate is flush with the four outer sides of the two coils. The pins are led out from the coils to the side wall of the cover plate.

6. The magnetic device of claim 5, wherein, The magnetic device further includes a panel arranged on one side of one of the cover plates away from the middle column. The panel is provided with two positioning holes, and the pins are arranged in the positioning holes. The pins and the positioning holes correspond to each other one by one.

Images