Semi-magnetic part and electromagnetic device with consistency and stability

Abstract

The utility model provides a semi-magnetic device with consistency and stability and an electromagnetic device. The semi-magnetic piece comprises a magnet and a plurality of external terminals, the magnet comprises a magnetic cover plate and a magnetic core, the magnetic core comprises a magnetic column and two magnetic walls arranged at the two ends of the magnetic column, the external terminals are arranged on the corresponding magnetic walls, the same magnetic wall is provided with at least two external terminals, and each external terminal at least comprises a side electrode and a patch electrode which are vertically connected. The side electrodes extend to be higher than the magnetic wall and are attached to the side face of the magnetic cover plate, the side face of the magnetic cover plate is provided with a first protruding part, the first protruding part extends to the position between the two adjacent side electrodes, the magnetic cover plate is restrained through the two adjacent side electrodes, the magnetic cover plate and the magnetic core are not prone to dislocation, and consistency and stability of products can be guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electromagnetic devices, in particular to a semi-magnetic device with consistency and stability and an electromagnetic device. BACKGROUND

[0002] With the rapid development of technology, especially the emergence of multifunctional devices, the demand for passive devices is increasing, and electromagnetic devices such as inductors, as one of the passive components, are widely used, and the demand for large current, high frequency, high reliability and other requirements of electromagnetic devices is constantly upgraded. Taking passive components applied in automobiles as an example, with the continuous improvement of automobile electronics, the types and quantities of passive components are continuously improved, which is more demanding than ordinary passive components, mainly because the working environment is more severe, and it requires longer design life, higher safety and reliability, which makes inductors more widely used. In traditional electromagnetic devices, the magnet is usually composed of a magnetic cover plate and a magnetic core, the magnetic core includes a magnetic column and two magnetic walls arranged at both ends of the magnetic column, and the magnetic cover plate is arranged above the magnetic wall and opposite to the magnetic column.

[0003] In the existing electromagnetic device, there is a lack of positioning constraint between the magnetic cover plate and the magnetic core, and the magnetic cover plate and the magnetic core are prone to misalignment during production, which not only leads to a smaller magnetic flux area at this position, a decrease in product performance and instability, but also leads to different sizes and performances of products in the same batch, i.e. consistency and stability are difficult to meet the requirements; in addition, although the magnetic cover plate and the magnetic core are generally bonded by glue, the bonding strength of the glue is limited, especially the bonding strength of the traditional high solid content glue is relatively weak, and in the use of the harsh working environment, or once accidentally touch the magnetic cover plate, it is very easy to cause misalignment between the magnetic cover plate and the magnetic core, and even the magnetic cover plate falls off, resulting in poor product stability. Practical new type content

[0004] Therefore, the present application provides a semi-magnetic device with consistency and stability and an electromagnetic device, which can improve the problem that the magnetic cover plate and the magnetic core are prone to misalignment and the consistency and stability of the product are difficult to guarantee.

[0005] The semi-magnetic device with consistency and stability provided by the present application comprises:

[0006] The magnet comprises a magnetic cover plate and a magnetic core, the magnetic core comprises a magnetic column and two magnetic walls arranged opposite to both ends of the magnetic column in a first direction, and the first side of the magnetic wall is connected to the magnetic cover plate;

[0007] A plurality of external terminals are arranged on the corresponding magnetic wall, and at least two external terminals are arranged on the same magnetic wall, each external terminal comprising a side electrode and a patch electrode connected perpendicularly, the patch electrode being arranged on the second side of the magnetic wall, and the side electrode being arranged on the third side of the magnetic wall, the second side and the first side of the magnetic wall being arranged opposite to each other along a second direction, and both being perpendicular to the third side.

[0008] The side electrode extends above the magnetic wall and is attached to the side of the magnetic cover plate, and the magnetic cover plate is provided with a first protrusion extending between two adjacent side electrodes.

[0009] Optionally, the third side of the magnetic wall is provided with a second protrusion, the second protrusion is arranged between two adjacent side electrodes, and the first protrusion is arranged on the second protrusion and aligned vertically.

[0010] Optionally, the top surface of the side electrode is flush with the top surface of the magnetic cover plate, or lower than the top surface of the magnetic cover plate.

[0011] Optionally, the height difference between the side electrode and the top surface of the magnetic cover plate is K, the thickness of the magnetic cover plate is T, and 0.05*T

[0012] Optionally, the thickness of the side electrode is equal to the thickness of the first protrusion.

[0013] Optionally, the side electrode is bonded to the side of the magnetic cover plate.

[0014] Optionally, the bonding area between the side electrode and the side of the magnetic cover plate is S, and S≥0.2mm 2 .

[0015] The electromagnetic device provided in the present application comprises a winding and a half-magnetic piece as described in any of the above, and the winding is wound around the magnetic column and located between the two magnetic walls.

[0016] Optionally, the external terminal further comprises an extension electrode, one end of the extension electrode is connected to the side electrode, the other end of the extension electrode is bent towards the winding and arranged opposite to the winding, and the lead of the winding is electrically connected to the other end of the extension electrode.

[0017] Optionally, the external terminal further comprises an extension electrode, one end of the extension electrode is connected to the patch electrode, the other end of the extension electrode is bent towards the winding and arranged opposite to the winding, and the lead of the winding is electrically connected to the other end of the extension electrode.

[0018] As described above, in the semi-magnetic component and the electromagnetic device of the present application, the same magnetic wall is provided with at least two external terminals, each of which comprises at least a side electrode and a patch electrode connected perpendicularly, the side electrode extending above the magnetic wall and being attached to the side of the magnetic cover plate, the magnetic cover plate being provided with a first protrusion extending between the adjacent two side electrodes, the magnetic cover plate being constrained by the adjacent two side electrodes so as to prevent misalignment between the magnetic cover plate and the magnetic core, thereby ensuring the consistency and stability of the product.

[0019] In addition, the side electrode can be attached to the side of the magnetic cover plate, so that the magnetic cover plate and the side electrode are not easy to shift relative to each other, which not only reduces the risk of the magnetic cover plate falling off, but also further constrains the magnetic cover plate, making it more difficult for the magnetic cover plate and the magnetic core to misalign, thereby further ensuring the consistency and stability of the product. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a schematic diagram of the electromagnetic device of the first embodiment of the present application from a first perspective;

[0021] Figure 2 is a schematic diagram of the electromagnetic device of the first embodiment of the present application from a second perspective; Figure 1

[0022] Figure 3 is a schematic diagram of the electromagnetic device of the first embodiment of the present application from a bottom view; Figure 1

[0023] Figure 4 is a schematic diagram of the electromagnetic device of the first embodiment of the present application when the extension electrode is in a first position; Figure 2

[0024] Figure 5 is a schematic diagram of the electromagnetic device of the first embodiment of the present application from a bottom view; Figure 4

[0025] Figure 6 is a schematic diagram of the electromagnetic device of the first embodiment of the present application when no welding is performed; Figure 2

[0026] Figure 7 is a schematic diagram of one external terminal of the electromagnetic device of the first embodiment of the present application; Figure 1

[0027] Figure 8 is a schematic diagram of the extension electrode of the external terminal of the first embodiment of the present application when the extension electrode is in a first position; Figure 7

[0028] Figure 9 is a schematic diagram of the electromagnetic device of the first embodiment of the present application when no external terminal is provided; Figure 1

[0029] Figure 10 ​​​​​​​​is a perspective structural schematic view of a first view angle of an electromagnetic device of a second embodiment of the present application;

[0030] Figure 11 is a perspective structural schematic view of a second view angle of the electromagnetic device shown in Figure 10

[0031] Figure 12 is a bottom view of the electromagnetic device shown in Figure 10

[0032] Figure 13 is a structural schematic view of the electromagnetic device when the extension electrode of the external terminal is in the first position shown in Figure 12

[0033] Figure 14 is a bottom view of the electromagnetic device shown in Figure 13

[0034] Figure 15 is a structural schematic view of an external terminal of the electromagnetic device shown in Figure 10

[0035] Figure 16 is a structural schematic view of the extension electrode of the external terminal in the first position shown in Figure 15

[0036] first direction x, second direction y, third direction z;

[0037] electromagnetic device 100;

[0038] magnet 1, notch 1a, magnetic cover plate 10, first protrusion 101, magnetic column 111, magnetic wall 112, protrusion 113, second protrusion 114;

[0039] winding 2, lead wire 20, solder 21;

[0040] external terminal 3;

[0041] soldering portion 30, patch electrode 31, side electrode 32, extension electrode 33, necking region 34;

[0042] first sub-portion 301, second sub-portion 302, recessed region 303. DETAILED DESCRIPTION

[0043] To solve the above technical problems in the prior art, in the semi-magnetic device and the electromagnetic device of the present application, at least two external terminals are arranged on the same magnetic wall, each external terminal at least includes a vertically connected side electrode and a patch electrode, the side electrode extends to above the magnetic wall and is attached to the side of the magnetic cover plate, the magnetic cover plate is provided with a first protrusion, the first protrusion extends to between the adjacent two side electrodes, the magnetic cover plate is constrained by the adjacent two side electrodes, so that the magnetic cover plate and the magnetic core are not prone to misalignment.​​​​​​

[0044] The specific forms of the shape, number, size, and other parameters of the magnet, the magnetic wall, the external terminal, and any of the electrodes thereof can be determined according to the requirements of the actual scene, and the present application is not limited thereto.

[0045] To make the objects, technical solutions, and advantages of the present application clearer, the technical solutions of the present application will be described clearly below in conjunction with specific embodiments and corresponding drawings. Obviously, the following described embodiments are only some of the embodiments of the present application, rather than all the embodiments. In the case of no conflict, each of the following embodiments and technical features can be combined with each other, and also belong to the technical solutions of the present application.

[0046] In the description of the embodiments of the present application, the orientations or positional relationships indicated by the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer”, “clockwise”, “counterclockwise”, and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the technical solutions of the corresponding embodiments, and are not intended to indicate or imply that the device or element must have a particular orientation, be constructed and operated in a particular orientation, and cannot be understood as a limitation of the present application.

[0047] First Embodiment

[0048] Please refer to Figures 1 to 9 As shown in the figure, the electromagnetic device 100 of the present example includes a magnet 1, a winding 2, and a plurality of external terminals 3. The number of external terminals 3 can be determined adaptively according to the type of the electromagnetic device 100, for example, the common mode inductor shown in the figure can be provided with four external terminals 3.

[0049] Among them, the magnet 1 and the plurality of external terminals 3 constitute a semi-finished product of the electromagnetic device 100, so it can be called “semi-magnetic device”.

[0050] For the convenience of description and understanding, in combination with the placement orientation shown in the figure, the width direction of the electromagnetic device 100 is referred to as the first direction x, the height direction is referred to as the second direction y, and the thickness direction is referred to as the third direction z. The first direction x, the second direction y, and the third direction z are perpendicular to each other, and can be regarded as three coordinate axes of a three-dimensional rectangular coordinate system. It should be understood that the perpendicularity in the present application throughout the text does not require that the included angle between the two must be 90°, but allows a deviation of, for example, ±10°, that is, the so-called perpendicularity can be understood as the included angle between any two directions being 80° to 100°. Similarly, the parallelism throughout the text also does not require that the included angle between the two must be 0° or 180°, but allows a deviation of, for example, ±10°, that is, the so-called parallelism can be understood as the included angle between any two directions being 0° to 10° or 170° to 190°.

[0051] The magnet 1 includes a magnetic cover 10 and a magnetic core. The magnetic core includes a magnetic column 111 and two magnetic walls 112. The two magnetic walls 112 are arranged opposite each other along a first direction x and are respectively connected to the ends of the magnetic column 111. The two magnetic walls 112 can be symmetrically arranged along the central axis of the magnetic column 111 (the central axis is parallel to the second direction y), and the structure is completely symmetrical. The magnetic core can be a one-piece structural component.

[0052] The magnetic wall 112 may be in the shape of a plate or a block. Figure 1 The upper side of the magnetic wall 112 is connected to the magnetic cover 10, for example, by gluing, so as to form a magnet 1 with a complete closed magnetic path. The second side of the magnetic wall 112 is arranged opposite to the first side along the second direction y and is perpendicular to the third side. The second side can be called Figure 1 The lower side when placed in the orientation shown, the third side can be called Figure 1 The left and right sides of the electromagnetic device 100 when placed in the shown orientation, specifically, the third side of the left magnetic wall 112 can be called the left side of the electromagnetic device 100, and the third side of the right magnetic wall 112 can be called the right side of the electromagnetic device 100. For any of the magnetic walls 112, the fourth side of the magnetic wall 112 is arranged back to back with the third side along the first direction x, and is connected to the end of the magnetic column 111.

[0053] The winding 2 is wound around the magnetic column 111 and located between the two magnetic walls 112. The winding 2 can be formed by winding a lead wire 20 of a type such as an enameled wire in a circle, and the winding method is determined according to the adaptability, so that it is wound around the magnetic column 111 and assembled in the magnet 1. Each end of the lead wire 20 of the winding 2 can extend outside the magnet 1 and be electrically connected to the corresponding external terminal 3, such as by welding. For example, in Figures 1 to 5 In the example, the electromagnetic device 100 is a common-mode inductor, the winding 2 is provided with four lead wires 20 ends, the electromagnetic device 100 is provided with four external terminals 3, and the four lead wires 20 ends are electrically connected to the four external terminals 3 in a one-to-one correspondence.

[0054] Several external terminals 3 are bonded to the corresponding magnetic walls 112. At least two external terminals 3 are provided on the same magnetic wall 112. Figures 1 to 6 In the example, the electromagnetic device 100 is provided with four external terminals 3. Two external terminals 3 are bonded to one magnetic wall 112, and the other two external terminals 3 are bonded to another magnetic wall 112. The two external terminals 3 on each magnetic wall 112 are arranged opposite each other along the third direction z. The shapes of the four external terminals 3 can be the same or different. For ease of description, the description and illustration throughout this application and all drawings assume that all four external terminals 3 have the same shape.

[0055] See Figure 7 and Figure 8As shown, the single external terminal 3 at least includes a patch electrode 31 and a side electrode 32, and the patch electrode 31 and the side electrode 32 are vertically connected and can both be in a patch shape. The patch electrode 31 is arranged (e.g., bonded) on the second side of the corresponding magnetic wall 112, and the patch electrode 31 faces the circuit board and is used to perform SMT mounting. The side electrode 32 is bonded on the third side of the corresponding magnetic wall 112.

[0056] In the second direction y, the side electrode 32 extends to be higher than the corresponding magnetic wall 112 and is attached to the side of the overall block-shaped magnetic cover plate 10. The magnetic cover plate 10 includes two large faces, one of which is the upper surface or top surface, and the other large face faces the magnetic core and is bonded to both magnetic walls 112. The side of the magnetic cover plate 10 refers to the side arranged between the two large faces, specifically, the two sides arranged opposite to each other in the third direction z. The two sides of the magnetic cover plate 10 are both provided with a first protrusion 101, which extends between the adjacent two side electrodes 32 in parallel to the third direction z. Here, the magnetic cover plate 10 is constrained by the adjacent two side electrodes 32, so that the magnetic cover plate 10 is not prone to dislocation with the magnetic core, which is conducive to ensuring the consistency and stability of the product.

[0057] In addition, the side electrode 32 can be bonded to the side of the magnetic cover plate 10, for example, the bonding area between the two is S, and S satisfies: S≥0.2mm 2 Here, the magnetic cover plate 10 and the side electrode 32 are not prone to relative displacement, which not only reduces the risk of the magnetic cover plate 10 falling off the magnetic core, but also uses the larger bonding area between the side electrode 32 and the magnetic wall 112 to further constrain the magnetic cover plate 10, enhances the relative stability between the magnetic cover plate 10 and the magnetic wall 112 and the magnetic core, and makes the magnetic cover plate 10 and the magnetic core more difficult to dislocate, which is further conducive to ensuring the consistency and stability of the product.

[0058] Optionally, the top surface of the side electrode 32 is flush with the top surface of the magnetic cover plate 10, or lower than the top surface of the magnetic cover plate 10. In the scenario where the top surface of the side electrode 32 is lower than the top surface of the magnetic cover plate 10, it is preferred to satisfy 0.05*T<K≤T, where K is the height difference between the top surface of the side electrode 32 and the top surface of the magnetic cover plate 10, and T is the thickness of the magnetic cover plate 10, which is the length in the second direction y.

[0059] Please refer to Figure 9As shown, the magnetic wall 112 can be provided with a second protrusion 114, which is sandwiched between two adjacent side electrodes 32, and the first protrusion 101 is arranged on the second protrusion 114 and aligned with the second protrusion 114 in the second direction y. In this way, the magnetic core can be considered as being provided with two notches, each of which penetrates the magnetic wall 112 and the magnetic cover plate 10 in the second direction y, and the two adjacent side electrodes 32 are respectively accommodated in the two notches, so that the two side electrodes 32 are not easy to protrude from the third side of the magnetic wall 112, and of course, not easy to protrude from the outermost side of the magnetic cover plate 10, i.e., the outermost surface of the second protrusion 114. For example, the thickness of the side electrode 32 can be equal to the thickness of the first protrusion 101 or the second protrusion 114, so that the outer surface of the two side electrodes 32 is flush with the third side of the magnetic wall 112 and the outermost side of the magnetic cover plate 10, which ensures that the outer side of the entire magnet 1 is relatively flat.

[0060] In an example, each external terminal 3 can be L-shaped. For example, the lead 20 of the winding 2 can be electrically connected with the side electrode 32, for example, by welding.

[0061] In other examples, for example, please continue to refer to Figures 1 to 8 As shown, the external terminal 3 can also include an extension electrode 33. The extension electrode 33 is connected with the patch electrode 31 perpendicularly, so that the external terminal 3 as a whole is a U-shaped structural member with one long side and one short side. The extension electrode 33 is arranged on the fourth side of the corresponding magnetic wall 112, and as shown in the example Figure 1 and Figure 8 In the example shown, the side of the magnetic wall 112 facing the winding 2 can be provided with a notch 1a, and the extension electrode 33 includes two parts, one part is accommodated in the notch 1a and bonded with one side of the notch 1a, and the other part is arranged outside the notch 1a. Optionally, the lead 20 of the final product extending out of the winding 2 can be accommodated in the notch 1a.

[0062] The extension electrode 33 is provided with an electrical connection part 30, and the lead 20 of the winding 2 is electrically connected with the electrical connection part 30. For example, the lead 20 of the winding 2 is wound on the electrical connection part 30 and welded with the electrical connection part 30, for example, by laser welding. The soldering 21 during welding and the lead 20 melted due to high temperature during welding form a nodule-like structure as shown. Figures 1 to 5 In other examples, the lead 20 of the winding 2 and the electrical connection part 30 can also be electrically connected by conductive glue bonding. The embodiments and the drawings of the present application are described by taking the example that the lead 20 of the winding 2 is wound on the electrical connection part 30 and welded with the electrical connection part 30 to realize the electrical connection. In this way, the electrical connection part 30 can also be referred to as a welding part 30. Figure 1In the example, one end of the extended electrode 33 is connected to the patch electrode 31, which can be considered as the extended electrode 33 being connected to the side of the patch electrode 31, and the electrical connection portion 30 is provided at the other end of the extended electrode 33. In the example where the extended electrode 33 includes two parts, the other part can be considered as the other end of the extended electrode 33.

[0063] Combine Figure 4 、 Figure 5 and Figure 8 As shown, the extended electrode 33 can be bent to the first position relative to the patch electrode 31 and the side electrode 32. At this time, the extended electrode 33 is flat and sheet-like as a whole. Figure 4 、 Figure 5 and Figure 8 In the state shown, the extension electrode 33 can also be regarded as not being bent, and when the extension electrode 33 is bonded to the magnet 1, the other end of the extension electrode 33 faces away from the winding 2. Figure 4 and Figure 5 As shown, in the first position, the electrical connection portion 30 and the lead wire 20 wound thereon are located outside the two magnetic walls 112 , that is, outside the magnet 1 .

[0064] In the first position, the electromagnetic device 100 is in a semi-finished state, and the lead wire 20 has been wound around the electrical connection portion 30 and welded to the electrical connection portion 30 .

[0065] The extension electrode 33 can be connected to the patch electrode 31 and the side electrode 32 via Figure 4 and Figure 5 The first position shown is bent to Figures 1 to 3 In the second position, the electrical connection portion 30 and the lead 20 wound thereon are located between the two magnetic walls 112 and opposite the winding 2. When the extension electrode 33 is bent to the second position, it can be considered the final product state of the electromagnetic device 100.

[0066] Based on the above, when the extended electrode 33 is in the first position, the electrical connection part 30 of the extended electrode 33 is located outside the two magnetic walls 112, and the distance between the electrical connection part 30 and the winding 2 is relatively far. At this time, the lead 20 of the winding 2 is wound around the electrical connection part 30 and welded. The high temperature generated by welding will not affect the lead 20 in the winding 2, and damage to the lead 20 in the winding 2 can be avoided.

[0067] After the extension electrode 33 is bent from the first position to the second position, the electric connection part 30 and the lead wire 20 wound thereon are located between the two magnetic walls 112 and are opposite to the winding 2. Even if the lead wire 20 between the winding 2 and the welding point (or the electric connection part 20) is in a tight state at the first position, when the extension electrode 33 is bent towards the winding 2 to the second position, the distance between the winding 2 and the welding point is reduced, and the lead wire 20 at this position is not in a tight state but presents a curve or arc state with a certain arc, so as to eliminate the internal stress remaining after the winding and extension of the lead wire 20, facilitate the absorption of the stress generated in the use of the entire electromagnetic device 100, and the electric connection part 20 is located between the two magnetic walls 112, that is, inside the magnet 1 or the inner side of the magnetic wall 112, so as to eliminate the risk of failure of the welding point in the use of the entire electromagnetic device 100. As can be seen, the application can reduce the risk of the lead wire 20 extending from the winding 2 being pulled off and the risk of product failure caused thereby.

[0068] Optionally, the relative distance between the electric connection part 30 and the winding 2 is DO, that is, the distance along the third direction z is DO, and DO≥0.05mm, which can not only ensure good electrical insulation between the electric connection part 30 and the winding 2, but also make the electric connection part 30 extend more into the inside of the magnet 1, which is further conducive to eliminating the risk of failure of the welding point in the use of the entire electromagnetic device 100.

[0069] Please refer to Figures 1 to 8 As shown in the figure, the connection between the two parts of the extension electrode 33 can be provided with a necking area 34, the width of the necking area 34 is D1, the width of the two parts is D2, and the widths of the three are the lengths along the second direction y, and satisfy: D1<D2; optionally, the width D1 of the necking area 34 also satisfies: 0.1*D2≤D1≤0.95*D2. The necking area 34 is equivalent to narrowing the heat transfer channel between the two parts of the extension electrode 33, which can reduce the heat generated by welding of the electric connection part 30 to be transferred to the other part of the extension electrode 33, the patch electrode 31 and the electromagnetic device 100, that is, to realize heat insulation, improve or even eliminate the influence of high temperature on the inductance performance.

[0070] In addition, the necking area 34 is equivalent to reducing the structural strength between the electric connection part 30 and the patch electrode 31, and the extension electrode 33 can be bent relative to the patch electrode 31 at the necking area 34 to realize switching between the first position and the second position, that is, the necking area 34 can be regarded as a bending line for bending, and the side of the electric connection part 30 is facilitated to be pushed and folded.

[0071] Please refer to Figure 7 and Figure 8As shown, the electrical connection portion 30 can be provided with a first sub-portion 301 and a second sub-portion 302, the width of the first sub-portion 301 is smaller than that of the second sub-portion 302, i.e. the first sub-portion 301 and the second sub-portion 302 have a height difference along the second direction y, so that the first sub-portion 301 and the second sub-portion 302 form a stepped structure. In the example shown in the figure, the upper part of the first sub-portion 301 and the upper part of the second sub-portion 302 form a stepped structure, and the lower part of the first sub-portion 301 and the lower part of the second sub-portion 302 also form a stepped structure, and the height difference of the two stepped structures can be equal. The lead wire 20 is wound on the first sub-portion 301. The stepped structure is beneficial to the winding of the lead wire 20.

[0072] Optionally, the step height of the stepped structure is H1, i.e. the height difference between the upper side or the lower side of the first sub-portion 301 and the second sub-portion 302 along the second direction y is H1, the diameter of the lead wire 20 is φ, and H1≥0.2*φ; the height difference H1 in this range of values is more beneficial to the winding of the lead wire 20.

[0073] In an example, the first sub-portion 301 can be provided with a recessed area 303, the recessed direction (or depth direction) of the recessed area 303 is parallel to the width direction of the first sub-portion 301, i.e. the first direction x. The recessed area 303 facilitates the lead wire 20 to be wound on the electrical connection portion 30 and be closer to the first sub-portion 301. Optionally, the x-y cross section of the recessed area 303 includes but is not limited to V-shaped, circular arc-shaped.

[0074] Optionally, the recessed depth of the recessed area 303 is H2, and H2≥0.02mm. The recessed depth H2 in this range of values can ensure that the lead wire 20 is wound on the electrical connection portion 30 and is closer to the first sub-portion 301, ensure the stability of the winding of the lead wire 20, and also ensure the structural strength of the first sub-portion 301.

[0075] For a common mode inductor or other electromagnetic device 100, the winding 2 can include at least two coils, referring to Figure 2 and Figure 3 As an example of two coils, the winding 2 includes a first coil and a second coil, the magnetic column 111 can be provided with a protrusion 113 protruding from the main part of the magnetic column 111, the protrusion 113 is located between the first coil and the second coil, the protrusion 113 is provided with at least one wire passing groove (not shown in the figure), for example, provided on the bottom surface of the protrusion 113, the wire passing groove is used to accommodate the lead wire 20 of one of the first coil and the second coil extending towards the other. Through the protrusion 113, each coil and its lead wire 20 can be constrained to prevent the winding 2 from falling apart and crossing due to falling apart, thereby improving the consistency and stability of the product.

[0076] Second embodiment

[0077] For structural elements of the same name, the same reference numerals are used in the present application.

[0078] Based on the foregoing description of the electromagnetic device 100 of the first embodiment, the difference between the electromagnetic device 100 of the second embodiment is that, for any external terminal 3, there are also a patch electrode (equivalent to the commonly described "patch electrode") 31 and a side electrode (equivalent to the commonly described "side electrode") 32 which are vertically connected and both in the form of a sheet, but the patch electrode 31 also extends to the fourth side of the magnetic wall 112, which is equivalent to the aforementioned part of the extension electrode 33 located in the gap la. Of course, in other examples, the patch electrode 31 can also not extend to the fourth side of the magnetic wall 112.

[0079] One end of the extension electrode 33 is directly connected to the side electrode 32, rather than being connected to the patch electrode 31. The structure of the extension electrode 33 is the same as another part of the first embodiment described above, for example, also provided with an electrical connection part 30, and the electrical connection part 30 is provided at the other end of the extension electrode 33.

[0080] In combination Figures 10 to 16 As shown, the extension electrode 33 can be in a first position relative to the side electrode 32, as shown in Figure 13 and Figure 14 After the winding of the lead wire 20 and the welding between the electrical connection part 30 are completed, the extension electrode 33 can be bent to a second position relative to the side electrode 32, as shown in Figures 10 to 12 As shown in the first position, the electrical connection part 30 and the lead wire 20 wound thereon are located outside the two magnetic walls 112; in the second position, the electrical connection part 30 and the lead wire 20 wound thereon are located between the two magnetic walls 112 and are arranged opposite to the winding 2. When the extension electrode 33 is bent to the second position, it can be the final product state of the electromagnetic device 100. At this point, the electromagnetic device 100 of the second embodiment can also have the beneficial effects produced by the first embodiment described above.

[0081] The above only describes some embodiments of the present application, and does not limit the patent scope of the present application. For those of ordinary skill in the art, any equivalent structural transformation made by using the content of the present application and the drawings is also included in the patent protection scope of the present application.

[0082] Although the terms "first", "second", etc. are used herein to describe various information, the information should not be limited to these terms. These terms are only used to distinguish one category of information from another category of information. In addition, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "or" and "and / or" are to be construed as inclusive and meant to mean either one or any combination. Only when components, functions, steps, or operations are inherently mutually exclusive are they represented with "only one of" language.

Claims

1. A semi-magnetic component with both consistency and stability, characterized in that: include: A magnet, comprising a magnetic cover and a magnetic core, wherein the magnetic core comprises a magnetic column and two magnetic walls arranged at two ends of the magnetic column opposite to each other along a first direction, wherein a first side of the magnetic wall is connected to the magnetic cover; A plurality of external terminals are provided on corresponding magnetic walls, wherein the same magnetic wall is provided with at least two external terminals, each of the external terminals comprises at least a side electrode and a patch electrode connected perpendicularly, the patch electrode is provided on the second side of the magnetic wall, and the side electrode is provided on the third side of the magnetic wall, wherein the second side of the magnetic wall is provided opposite to the first side along the second direction and is perpendicular to the third side; The side electrodes extend to be higher than the magnetic wall and fit with the side of the magnetic cover plate. The side of the magnetic cover plate is provided with a first protrusion, and the first protrusion extends between two adjacent side electrodes.

2. The half magnetic piece according to claim 1, characterized in that: A second convex portion is provided on the third side of the magnetic wall. The second convex portion is sandwiched between two adjacent side electrodes. The first convex portion is provided on the second convex portion, and the two are aligned vertically.

3. The half magnetic piece according to claim 1, wherein: The top surface of the side electrode is flush with the top surface of the magnetic cover plate, or is lower than the top surface of the magnetic cover plate.

4. The half magnetic piece according to claim 3, characterized in that: The height difference between the side electrode and the top surface of the magnetic cover plate is K, the thickness of the magnetic cover plate is T, and the following relationship is satisfied: 0.05*T<K≤T.

5. The magnetic half according to any one of claims 1 to 3, characterized in that: The thickness of the side electrode is equal to the thickness of the first protrusion.

6. The half magnetic piece according to claim 5, characterized in that: The side electrodes are bonded to the side surfaces of the magnetic cover plate.

7. The half magnetic piece according to claim 6, characterized in that: The bonding area between the side electrode and the side of the magnetic cover is S, and satisfies: S ≥ 0.2 mm 2 .

8. An electromagnetic device, characterized in that: The magnetic half member comprises a winding and the magnetic half member according to any one of claims 1 to 7, wherein the winding is wound around the magnetic column and is located between the two magnetic walls.

9. The electromagnetic device according to claim 8, characterized in that The external terminal further includes an extended electrode, one end of which is connected to the side electrode, the other end of which is bent toward the winding and disposed opposite to the winding, and the lead of the winding is electrically connected to the other end of the extended electrode.

10. The electromagnetic device according to claim 8, characterized in that The external terminal further includes an extended electrode, one end of which is connected to the patch electrode, the other end of which is bent toward the winding and disposed opposite to the winding, and the lead of the winding is electrically connected to the other end of the extended electrode.

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