Magnetic element

Abstract

The invention provides a magnetic element, which comprises a first magnetic core, a second magnetic core and a coil group, and is characterized in that the first magnetic core comprises a first side column, a second side column and a first side column; the first side column has a first joint surface; the first side column and the second side column are arranged on the first joint face, and the first side column, the second side column and the first side column form a containing space. The first side column and the second side column are respectively provided with a second joint face and a third joint face. The second magnetic core is located in the accommodating space. The second magnetic core comprises a second side column, a first end column and a second end column. The first end column and the second end column are respectively arranged at two ends of the second side column. A first air gap, a second air gap, a third air gap and a fourth air gap exist between the first end post and the second joint face, between the second end post and the third joint face, between the first end post and the first joint face and between the second end post and the first joint face respectively. The coil group surrounds the second side post.

Description

Technical Field

[0001] The present invention relates to a magnetic component, and more particularly to a magnetic component capable of adjusting efficiency according to design requirements. Background Art

[0002] Magnetic components such as transformers and inductors are often used in various devices such as power supplies. How to provide a magnetic component capable of adjusting efficiency according to design requirements is the goal pursued by those in the relevant technical field. Summary of the Invention

[0003] The present invention relates to a magnetic component. A plurality of air gaps are formed between two magnetic cores, and the efficiency of the magnetic component can be adjusted according to design requirements through the plurality of air gaps.

[0004] According to an aspect of the present invention, a magnetic component is provided. The magnetic component includes a first magnetic core, a second magnetic core, and a coil group. The first magnetic core includes a first side post, a second side post, and a first lateral post. The first lateral post has a first joint surface. The first side post and the second side post are disposed on the first joint surface of the first lateral post, and the first side post, the second side post, and the first lateral post form a receiving space. The first side post and the second side post respectively have a second joint surface and a third joint surface, and the second joint surface and the third joint surface are disposed face to face. The second magnetic core is located in the receiving space. The second magnetic core includes a second lateral post, a first end post, and a second end post. The first end post and the second end post are respectively disposed at two ends of the second lateral post. A first air gap exists between the first end post and the second joint surface. A second air gap exists between the second end post and the third joint surface. A third air gap exists between the first end post and the first joint surface. A fourth air gap exists between the second end post and the first joint surface. The coil group surrounds the second lateral post.

[0005] For a better understanding of the above and other aspects of the present invention, the following specific embodiments are given, and are described in detail in conjunction with the accompanying drawings as follows. Brief Description of the Drawings

[0006] Figure 1 An assembled view of a magnetic component according to an embodiment of the present invention is shown;

[0007] Figure 2 Shown Figure 1 an exploded view of the magnetic component;

[0008] Figure 3A Shown Figure 1 a schematic view of the first magnetic core of the magnetic component;

[0009] Figure 3B Shown from another perspective Figure 3A a schematic view of the first magnetic core;

[0010] Figure 4A ShownFigure 1 Schematic diagram of the second magnetic core of the magnetic component;

[0011] Figure 4B is shown from another perspective Figure 4A Schematic diagram of the second magnetic core;

[0012] Figure 5 Shows Figure 1 Schematic perspective sectional view of the magnetic component;

[0013] Figure 6 Shows Figure 1 Schematic sectional view of the magnetic component;

[0014] Figure 7 Schematic sectional view of the magnetic component according to another embodiment of the present invention;

[0015] Figure 8 Side view of the magnetic component according to yet another embodiment of the present invention;

[0016] Figure 9 Side view of the magnetic component according to still another embodiment of the present invention;

[0017] Figure 10 Shows the inductance curves of the magnetic component of the comparative example and the magnetic component of the embodiment of the present invention under different current loads;

[0018] Figure 11 Assembly diagram of the magnetic component according to other embodiments of the present invention;

[0019] Figure 12A Shows Figure 11 Schematic diagram of the second magnetic core of the magnetic component;

[0020] Figure 12B is shown from another perspective Figure 12A Schematic diagram of the second magnetic core; and

[0021] Figure 13 Shows Figure 11 Schematic sectional view of the magnetic component along the section line 13 - 13'.

[0022] Wherein, reference numerals:

[0023] 100, 100a, 100b, 100c, 100d: Magnetic components

[0024] 110: First magnetic core

[0025] 111: First side post

[0026] 111J: First joint surface

[0027] 111R: Groove portion

[0028] 112: First side column

[0029] 112a, 113a: First wall

[0030] 112b, 113b: Second wall

[0031] 112c, 113c: Connecting wall

[0032] 112J: Second joint surface

[0033] 113: Second side column

[0034] 113J: Third joint surface

[0035] 120, 120b, 120c, 120d: Second magnetic core

[0036] 120S: Flat surface

[0037] 121: Second side post

[0038] 122, 122b, 122c, 122d: First end post

[0039] 122R1, 122R2, 123R1, 123R2: Notch

[0040] 123, 123b, 123c, 123d: Second end post

[0041] 130: Coil group

[0042] 131: Inlet terminal

[0043] 132: Outlet terminal

[0044] G1: First air gap

[0045] G2: Second air gap

[0046] G3: Third air gap

[0047] G4: Fourth air gap

[0048] N1: First normal

[0049] N2: Second normal

[0050] N3: Third normal

[0051] S: Accommodation space

[0052] 13 - 13’: Section line. Detailed implementation manners

[0053] The magnetic component of the present invention includes a first magnetic core, a second magnetic core, and a coil group. A plurality of air gaps are formed between the first magnetic core and the second magnetic core, and the efficiency of the magnetic component can be adjusted according to design requirements through these air gaps.

[0054] The following will detail the embodiments of the present invention and use the drawings as illustrations. In addition to these detailed descriptions, the present invention can also be widely implemented in other embodiments. Any easy substitution, modification, and equivalent change of any of the described embodiments are included within the scope of the present invention and are subject to the subsequent patent scope. In the description of the specification, many specific details and implementation examples are provided to enable readers to have a more complete understanding of the present invention; however, these specific details and implementation examples should not be regarded as limitations of the present invention. In addition, well-known steps or components are not described in detail to avoid unnecessary limitations to the present invention. In the drawings, the same or similar element symbols are used to represent the same or similar elements.

[0055] Figure 1 The assembled drawing of the magnetic component 100 according to an embodiment of the present invention is shown; Figure 2 Shown Figure 1 The exploded view of the magnetic component 100.

[0056] Please refer to Figure 1 and Figure 2 , the magnetic component 100 includes a first magnetic core 110, a second magnetic core 120, and a coil group 130. The first magnetic core 110 may include a first side column 111, a first side post 112, and a second side post 113. The first side column 111, the first side post 112, and the second side post 113 may be integrally formed. The first side column 111, the first side post 112, and the second side post 113 may form a receiving space S. The second magnetic core 120 may include a second side column 121, a first end column 122, and a second end column 123. The second side column 121, the first end column 122, and the second end column 123 may be integrally formed. The coil group 130 surrounds the second side column 121 of the second magnetic core 120. The second magnetic core 120 and the coil group 130 surrounding the second side column 121 may be disposed in the receiving space S along the positive direction of the X axis. When current flows through the coil group 130, the second magnetic core 120 and the first magnetic core 110 may form a closed magnetic circuit.

[0057] Figure 3A Shown Figure 1 The schematic diagram of the first magnetic core 110 of the magnetic component 100; Figure 3B Shown from another perspective Figure 3A The schematic diagram of the first magnetic core 110; Figure 4A Shown Figure 1 The schematic diagram of the second magnetic core 120 of the magnetic component 100; Figure 4B Shown from another perspective Figure 4A The schematic diagram of the second magnetic core 120.

[0058] Please refer to Figure 2 、 Figure 3A and Figure 3B As shown in FIGS.

[0059] The first side post 111 of the first magnetic core 110 has a first joint surface 111J, and the first joint surface 111J faces the negative direction of the X-axis. In other words, the first joint surface 111J has a first normal line N1, and the first normal line N1 is parallel to the X-axis and points to the negative direction of the X-axis. In a specific embodiment, the first side post 111 may have a groove portion 111R. The groove portion 111R may be recessed slightly inward (toward the positive direction of the X-axis) from the first joint surface 111J at a position approximately in the center of the first side post 111 along the Y-axis, so that the first side post 111 generally presents a U-shaped structure.

[0060] The first side post 112 and the second side post 113 are disposed on the first joint surface 111J of the first side post 111. In a specific embodiment, the first side post 112 and the second side post 113 may each include a first wall 112a and 113a, a second wall 112b and 113b, and connecting walls 112c and 113c. The connecting walls 112c and 113c connect the first walls 112a and 113a and the second walls 112b and 113b. The first wall 112a and the second wall 112b are disposed on opposite sides of the connecting wall 112c in the Z-axis direction, and the first wall 112a and the second wall 112b also extend toward the negative direction of the Y-axis, so that the first wall 112a, the connecting wall 112c, and the second wall 112b form a U-shaped side post. The first wall 113a and the second wall 113b are disposed on opposite sides of the connecting wall 113c in the Z-axis direction, and the first wall 113a and the second wall 113b also extend toward the positive direction of the Y-axis, so that the first wall 113a, the connecting wall 113c, and the second wall 113b form a U-shaped side post. The second side post 112 of the first magnetic core 110 has a second joint surface 112J, and the second side post 113 of the first magnetic core 110 has a third joint surface 113J. The second joint surface 112J faces the negative direction of the Y-axis, the third joint surface 113J faces the positive direction of the Y-axis, and the second joint surface 112J and the third joint surface 113J are disposed face to face. In other words, the second joint surface 112J has a second normal line N2, and the third joint surface 113J has a third normal line N3. The second normal line N2 and the third normal line N3 are parallel to the Y-axis and point to the negative direction and the positive direction of the Y-axis respectively. In a specific embodiment, the second joint surface 112J may be the surface of the connecting wall 112c of the first side post 112 facing the accommodation space S, and the second joint surface 112J is connected to the first joint surface 111J; the third joint surface 113J may be the surface of the connecting wall 113c of the second side post 113 facing the accommodation space S, and the third joint surface 113J is connected to the first joint surface 111J.In a specific embodiment, the first magnetic core 110 may be generally a U-shaped magnetic core. The first side column 111, the first end column 112, and the second end column 113 of the first magnetic core 110 may each present a U-shaped structure, and the openings of the U-shaped structures all face the accommodation space S.

[0061] Please refer to Figure 2 , Figure 4A and Figure 4B , the second side column 121 of the second magnetic core 120 may present a cuboid structure extending along the Y-axis. The first end column 122 and the second end column 123 are respectively disposed at both ends of the second side column 121, for example, are disposed at both ends of the second side column 121 on the Y-axis. In a specific embodiment, the second magnetic core 120 may be generally an I-shaped magnetic core. The first end column 122 and the second end column 123 may be respectively flat plate structures, and the first end column 122 and the second end column 123 are respectively perpendicular to the second side column 121.

[0062] The first end column 122 and the second end column 123 respectively protrude from the second side column 121 in the positive and negative directions of the Z-axis and the positive direction of the X-axis, and the second magnetic core 120 has a flat surface 120S on the side facing the negative direction of the X-axis. Please refer to Figure 1 , Figure 2 and Figure 4A , the coil group 130 has an inlet end 131 where the coil inlet starts winding and an outlet end 132 where the coil winding is completed. The inlet end 131 of the coil group 130 may be disposed on this flat surface 120S, so that the coil enters from one side of this flat surface 120S and starts to wind around the second side column 121 of the second magnetic core 120. Since the coil starts winding immediately after entering from one side of the flat surface 120S, when the coil gradually winds and stacks on the second side column 121, the subsequent wound coils will not be superimposed or squeezed on the coils at the inlet end 131. Therefore, the risk of short circuit caused by wear of the coils at the inlet end 131 can be avoided. In addition, the coil group 130 can be automatically wound on a winding machine in an automated manner.

[0063] On the other hand, since the coil group 130 is exposed on the side in the negative direction of the X-axis, the overall heat dissipation space can be increased, which helps to improve the heat dissipation efficiency.

[0064] The first magnetic core 110 and the second magnetic core 120 can be made of different materials. In one embodiment, the first magnetic core 110 can be made of a material with a relatively large vacuum permeability to improve the efficiency of achieving the required inductance under light load. For example, the first magnetic core 110 can be made of a manganese-zinc alloy, and the second magnetic core 120 can be made of a ferro-nickel alloy.

[0065] Figure 5 The three-dimensional cross-sectional schematic diagram of the magnetic component 100 shown in Figure 1 ; Figure 6 The Figure 1Schematic cross-sectional view of the magnetic component 100.

[0066] Please refer to Figure 5 and Figure 6 There may be a first air gap G1 between the first end post 122 of the second magnetic core 120 and the second joint surface 112J of the first side post 112 of the first magnetic core 110; there may be a second air gap G2 between the second end post 123 of the second magnetic core 120 and the third joint surface 113J of the second side post 113 of the first magnetic core 110. The first air gap G1 and the second air gap G2 are respectively the distances by which the first end post 122 and the second joint surface 112J, and the second end post 123 and the third joint surface 113J are spaced apart on the Y-axis. The sizes of the first air gap G1 and the second air gap G2 can be adjusted according to the specifications of the power supply for the actual application of the magnetic component 100. For example, the sizes of the first air gap G1 and / or the second air gap G2 can be increased to adjust the operating current required by the magnetic component 100. The sizes of the first air gap G1 and the second air gap G2 can be adjusted by changing the shapes / sizes of the first end post 122 and the second end post 123 of the second magnetic core 120.

[0067] In addition, there may be a third air gap G3 between the first end post 122 of the second magnetic core 120 and the first joint surface 111J of the first side post 111 of the first magnetic core 110, and the third air gap G3 communicates with the first air gap G1; there may be a fourth air gap G4 between the second end post 123 of the second magnetic core 120 and the first joint surface 111J of the first side post 111 of the first magnetic core 110, and the fourth air gap G4 communicates with the second air gap G2. The third air gap G3 and the fourth air gap G4 are respectively the distances by which the first end post 122 and the first joint surface 111J, and the second end post 123 and the first joint surface 111J are spaced apart on the X-axis. The sizes of the third air gap G3 and the fourth air gap G4 are adjustable to achieve the required inductance. For example, the sizes of the third air gap G3 and the fourth air gap G4 can be adjusted starting from 0, that is, the first end post 122 and the second end post 123 can be attached to the first joint surface 111J, as Figure 7 shown, which shows a schematic cross-sectional view of a magnetic component 100a according to another embodiment of the present invention. In order to adjust the starting inductance value under light load and delay the decline of the inductance under heavy load, the third air gap G3 and / or the fourth air gap G4 can be increased. The sizes of the third air gap G3 and the fourth air gap G4 can be adjusted by moving the second magnetic core 120 along the X-axis.

[0068] An insulating glue layer (not shown) can be selectively filled in the first air gap G1, the second air gap G2, the third air gap G3, and the fourth air gap G4 respectively. The insulating glue layer can be doped with insulating beads corresponding in size to the sizes of the first air gap G1, the second air gap G2, the third air gap G3, and the fourth air gap G4, so that the first magnetic core 110 and the second magnetic core 120 are fixed with an appropriate air gap size.

[0069] Please refer to Figure 6 and Figure 7 , since the surfaces of the first end post 122 and the second end post 123 facing the first air gap G1 and the second air gap G2 are flat, the dimensions of the first air gap G1 and the second air gap G2 on the X-axis and the Z-axis are the same. However, the present invention is not limited thereto. In other embodiments, the first air gap G1 and / or the second air gap G2 may have dimensional variations on the Z-axis.

[0070] Figure 8 FIG. shows a side view of a magnetic element 100b according to another embodiment of the present invention; Figure 9 FIG. shows a side view of a magnetic element 100c according to still another embodiment of the present invention.

[0071] Please refer to Figure 8 , Figure 8 The main difference between the magnetic element 100b of Figure 6 and Figure 7 the magnetic elements 100 and 100a is that, in this embodiment, the first end post 122b of the second magnetic core 120b has a notch 122R1 at the edge on the side close to the second joint surface 112J, and the notch 122R1 penetrates the first end post 122b along the X-axis. The second end post 123b of the second magnetic core 120b has a notch 123R1 at the edge on the side close to the third joint surface 113J, and the notch 123R1 penetrates the second end post 123b along the X-axis. The notch 122R1 and the notch 123R1 may be rectangular parallelepiped-shaped notches, such that the first air gap G1 and the second air gap G2 show a stepped change on the Z-axis.

[0072] Please refer to Figure 9 , Figure 9 The main difference between the magnetic element 100c of Figure 6 and Figure 7 the magnetic elements 100 and 100a is that, in this embodiment, the first end post 122c of the second magnetic core 120c has a notch 122R2 at the edge on the side close to the second joint surface 112J, and the notch 122R2 penetrates the first end post 122c along the X-axis. The second end post 123c of the second magnetic core 120c has a notch 123R2 at the edge on the side close to the third joint surface 113J, and the notch 123R2 penetrates the second end post 123c along the X-axis. The notch 122R2 and the notch 123R2 may be triangular prism-shaped notches, such that the first air gap G1 and the second air gap G2 show a gradually expanding change on the opposite sides of the Z-axis.

[0073] Figure 10 FIG. shows the inductance curves of a magnetic element of a comparative example and the magnetic elements 100, 100a, and 100b of the embodiments of the present invention under different current loads, wherein the comparative example is a general magnetic element having an annular magnetic core. Some data are listed in Table 1.

[0074] Number of turns Initial inductance value (μH) DC resistance (Mohm) Comparative example 79 470 90.2 Magnetic component 100a 70 701 89.6 Magnetic component 100 70 481 89.6 Magnetic component 100b 70 694 89.6

[0075] Please refer to Figure 10 , as can be seen from the figure and Table 1, compared with the magnetic components of the comparative examples, the magnetic component 100a can be made with fewer turns of the coil, and its overall inductance is also increased. Compared with the magnetic component 100a in which the sizes of the third air gap G3 and the fourth air gap G4 are 0, the magnetic component 100 adjusts the initial inductance value under light load and delays the decline of the inductance under heavy load by increasing the sizes of the third air gap G3 and the fourth air gap G4. Compared with the magnetic component 100a, the first air gap G1 and the second air gap G2 of the magnetic component 100b change stepwise on the Z-axis, thereby finely adjusting the inductance curve. Generally speaking, the magnetic components 100, 100a, and 100b of the embodiments of the present invention can still reduce the amount of inductance decline and improve the overall current-carrying strength even under heavy load conditions (such as when the current is greater than 9A).

[0076] Please refer to Figure 6 , since the surfaces of the first end post 122 and the second end post 123 facing the third air gap G3 and the fourth air gap G4 are flat, the sizes of the third air gap G3 and the fourth air gap G4 are the same in the Y-axis and the Z-axis. However, the present invention is not limited thereto. In other embodiments, the third air gap G3 and / or the fourth air gap G4 may have size variations in the Z-axis.

[0077] Figure 11 The assembled drawing of the magnetic component 100d according to other embodiments of the present invention is shown; Figure 12A Shown is Figure 11 the schematic diagram of the second magnetic core 120d of the magnetic component 100d; Figure 12B Shown from another perspective is Figure 12A the schematic diagram of the second magnetic core 120d; Figure 13 Shown is Figure 11 the schematic cross-sectional view of the magnetic component 100d along the section line 13-13'.

[0078] Please refer to Figure 11 , Figure 12A , Figure 12B and Figure 13 , the main difference between the magnetic component 100d and Figure 6 and Figure 7 the magnetic components 100 and 100a of Figure 6 and Figure 7In an embodiment, the shapes of the first end post 122 and the second end post 123 of the second magnetic core 120 present a square flat plate structure. In this embodiment, one side of the first end post 122d and the second end post 123d of the second magnetic core 120d has an arc structure, especially one side facing the positive direction of the X axis (or one side close to the first joint surface 111J) has an arc structure, and the arc structure protrudes towards the first joint surface 111J, so that the third air gap G3 and the fourth air gap (not labeled) present a gradually expanding change on the opposite sides in the Z axis.

[0079] In an embodiment, as Figure 13 shown, the first end post 122d can be in contact with the first joint surface 111J at the vertex of its arc structure, and be away from the first joint surface 111J on the opposite sides far from the vertex, so that the size of the third air gap G3 in the Z axis presents a gradually expanding change from the middle to both sides. Additionally, although not shown in the figure, the second end post 123d can also be in contact with the first joint surface 111J at the vertex of its arc structure, and be away from the first joint surface 111J on the opposite sides far from the vertex, so that the size of the fourth air gap in the Z axis presents a gradually expanding change from the middle to both sides. However, the present invention is not limited thereto. In another embodiment, the first end post 122d and the second end post 123d may not be in contact with the first joint surface 111J.

[0080] In summary, the magnetic component of the present invention can form multiple air gaps between the first magnetic core and the second magnetic core, and the efficiency of the magnetic component can be adjusted according to design requirements through these multiple air gaps. For example, by adjusting the size and / or dimensional change of these air gaps, the current flow that the magnetic component can withstand can be changed to correspond to the inductance requirements under light and heavy loads, so as to optimize the efficiency.

[0081] Although the present invention has been described above with embodiments, it is not intended to limit the present invention. Those of ordinary skill in the technical field to which the present invention pertains can make various changes and modifications without departing from the spirit and scope of the present invention.

Claims

1. A magnetic element, It is characterized in that include: A first magnetic core, comprising a first side column, a second side column and a first side column, wherein the first side column has a first joint surface, the first side column and the second side column are disposed on the first joint surface of the first side column, and the first side column, the second side column and the first side column form an accommodating space, the first side column and the second side column respectively have a second joint surface and a third joint surface, and the second joint surface and the third joint surface are arranged face to face; a second magnetic core located in the accommodating space, the second magnetic core comprising a second side column, a first end column and a second end column, the first end column and the second end column are respectively disposed at two ends of the second side column, a first air gap exists between the first end column and the second joint surface, a second air gap exists between the second end column and the third joint surface, a third air gap exists between the first end column and the first joint surface, and a fourth air gap exists between the second end column and the first joint surface; and A coil assembly surrounds the second side column.

2. The magnetic element according to claim 1, It is characterized in that The first magnetic core is a U-shaped magnetic core, and the second magnetic core is an I-shaped magnetic core.

3. The magnetic element according to claim 1, It is characterized in that The first side column of the first magnetic core has a groove portion, and the groove portion is recessed inward from the first joint surface.

4. The magnetic element according to claim 1, It is characterized in that The sizes of the third air gap and the fourth air gap are adjustable to achieve a desired inductance.

5. The magnetic element according to claim 1, It is characterized in that The first end column and the first joint surface are spaced apart on a first axis to form the third air gap therebetween; the second end column and the first joint surface are spaced apart on the first axis to form the fourth air gap therebetween; the first end column and the second joint surface are spaced apart on a second axis to form the first air gap therebetween; the second end column and the third joint surface are spaced apart on the second axis to form the second air gap therebetween; the first axis is perpendicular to the second axis.

6. The magnetic element according to claim 5, It is characterized in that The first air gap is connected to the third air gap, and the second air gap is connected to the fourth air gap.

7. The magnetic element according to claim 5, It is characterized in that The first air gap and / or the second air gap have the same size on a third axis, and the third axis is perpendicular to the first axis and the second axis.

8. The magnetic element according to claim 5, It is characterized in that The first air gap and / or the second air gap has a variation in size along a third axis, and the third axis is perpendicular to the first axis and the second axis.

9. The magnetic element according to claim 8, It is characterized in that The edge of the first end column on the side close to the second joint surface has a notch penetrating along the first axis, and / or the edge of the second end column on the side close to the third joint surface has a notch penetrating along the first axis.

10. The magnetic element according to claim 5, It is characterized in that The third air gap and / or the fourth air gap have the same size on a third axis, and the third axis is perpendicular to the first axis and the second axis.

11. The magnetic element according to claim 5, It is characterized in that The third air gap and / or the fourth air gap has a variation in size along a third axis, and the third axis is perpendicular to the first axis and the second axis.

12. The magnetic element according to claim 11, It is characterized in that The first end column has an arc structure, and the arc structure of the first end column protrudes toward the first joint surface, and / or the second end column has an arc structure, and the arc structure of the second end column protrudes toward the first joint surface.

13. The magnetic element according to claim 1, It is characterized in that The first joining surface has a first normal, the second joining surface has a second normal, the third joining surface has a third normal, the second normal and the third normal are orthogonal to the first normal, the first normal is parallel to a first axis, and the second normal and the third normal are parallel to a second axis.

14. The magnetic element according to claim 13, It is characterized in that The first end column and the second end column are respectively arranged at two ends of the second side column on the second axis.

15. The magnetic element according to claim 13, It is characterized in that The first side column and the second side column each include a connecting wall, a first wall and a second wall, the connecting wall connects the first wall and the second wall, the first wall and the second wall are relatively arranged on a third axis, the third axis is perpendicular to the first axis and the second axis, and the first wall, the connecting wall and the second wall constitute a U-shaped side column, the second joint surface is the surface of the connecting wall of the first side column facing the accommodating space, and the third joint surface is the surface of the connecting wall of the second side column facing the accommodating space.

16. The magnetic element according to claim 13, It is characterized in that The second magnetic core has a flat surface on one side of the first axis away from the first joint surface of the first side column, and the coil assembly is wound from one side of the flat surface.

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