Electromagnetic device and manufacturing method thereof

Abstract

The invention provides an electromagnetic device and a manufacturing method thereof. An external terminal of the electromagnetic device comprises a main body electrode and an additional electrode which are connected, when the additional electrode is located at a first position relative to the main body electrode, an electric connecting part of the additional electrode is located outside the two magnetic walls, and at the moment, a lead of the winding is electrically connected with the electric connecting part; and then the additional electrode is bent from a first position to a second position relative to the main body electrode, so that the electric connection part and the lead electrically connected with the electric connection part are positioned between the two magnetic walls and are arranged opposite to the winding, and even if the lead between the winding and the electric connection part is in a tightened state at the first position, the additional electrode cannot be damaged. Therefore, when the additional electrode is bent towards the winding to the second position, the distance between the winding and the electric connecting part is reduced, and the lead at the position is not in a tight state, so that the risk that the lead at the position is snapped and the product fails due to the snapped lead can be reduced.

Description

Technical Field

[0001] The present application relates to the field of electromagnetic devices, and in particular to an electromagnetic device and a method for manufacturing the same. Background Art

[0002] With the rapid development of science and technology, especially the emergence of multifunctional equipment, the demand for passive components is increasing. Electromagnetic devices such as inductors, which are one of the passive components, are also widely used, and the current demand for large current, high frequency, and high reliability of electromagnetic devices is constantly upgrading. Taking passive components used in automobiles as an example, with the continuous improvement of the level of automotive electronics, the types and quantity of passive components are constantly increasing. It has higher requirements than ordinary passive components, mainly because its working environment is more severe, requiring a longer design life, higher safety and reliability, which makes inductors more widely used. In traditional electromagnetic devices, the leads of the windings will be in a tight state when extending to the external terminals and welding with the external terminals, but the leads of the windings are generally thinner, with a minimum diameter of only 0.012mm, which is easier to break in harsh environments such as vehicle-mounted applications, resulting in product failure. For example, during customer reflow soldering, this location is prone to breaking due to the different expansion coefficients of various materials and their different response speeds to temperature changes. In the conformal coating process commonly used in vehicles, the curing shrinkage of the conformal coating can cause this location to be broken. Under cyclic mechanical stress or temperature shock in the vehicle environment, this location is prone to breaking. Summary of the invention

[0003] In view of this, the present application provides an electromagnetic device and a method for manufacturing the same, which can improve the problem that the lead wire between the winding and the welding point with the external terminal is easily broken, resulting in product failure.

[0004] The present application provides an electromagnetic device, comprising:

[0005] A magnet, comprising a magnetic cover plate and a magnetic core, wherein the magnetic core comprises a magnetic column and two magnetic walls arranged at two ends of the magnetic column in a first direction, and a first side of the magnetic wall is connected to the magnetic cover plate;

[0006] A winding, wound around the magnetic column and located between the two magnetic walls;

[0007] A plurality of external terminals are arranged on the corresponding magnetic walls, wherein the external terminals include a main electrode and an additional electrode connected to each other, and the lead of the winding is electrically connected to the electrical connection part of the additional electrode; the additional electrode can be bent to a first position or a second position relative to the main electrode, wherein, in the first position, the electrical connection part and the lead electrically connected thereto are located outside the two magnetic walls; in the second position, the electrical connection part and the lead electrically connected thereto are located between the two magnetic walls and are arranged opposite to the winding.

[0008] Optionally, the lead wire of the winding is wound around and welded to the electrical connection part of the additional electrode to achieve electrical connection.

[0009] Optionally, the main electrode includes a patch part and a side part that are vertically connected. The patch part is arranged on the second side of the magnetic wall, and the side part is arranged on the third side of the magnetic wall. The second side of the magnetic wall is arranged opposite to the first side along the second direction and is perpendicular to the third side; one end of the additional electrode is connected to the side part, and the electrical connection part is arranged at the other end of the additional electrode.

[0010] Optionally, the main electrode includes a patch part, a side part, and an extension part that are vertically connected. The patch part is arranged on the second side of the magnetic wall, the side part is arranged on the third side of the magnetic wall, the extension part is connected to the patch part and is arranged on the fourth side of the magnetic wall. The second side of the magnetic wall is arranged opposite to the first side along the second direction and is perpendicular to the third side, and the fourth side faces the magnetic column; one end of the additional electrode is connected to the extension part, and the electrical connection part is arranged at the other end of the additional electrode.

[0011] Optionally, a necking area is provided at the connection between the additional electrode and the extension part. The width of the necking area is D1, the width of the additional electrode is D2, and the width of the extension part is D3. D1 < D2 and D1 < D3; the additional electrode can be bent relative to the main electrode to the first position or the second position at the necking area.

[0012] Optionally, D2 < D3, and the width D1 of the necking area further satisfies: 0.1*D3 ≤ D1 ≤ 0.95*D3.

[0013] Optionally, the electrical connection part is provided with a first branch and a second branch. The width of the first branch is smaller than the width of the second branch, so that the first branch and the second branch form a stepped structure, and the lead wire is wound around the first branch.

[0014] Optionally, the first branch is provided with a recessed area, and the recessed direction of the recessed area is parallel to the width direction of the first branch.

[0015] Optionally, at least one of the following is satisfied:

[0016] The step height of the stepped structure is H1, and the wire diameter of the lead wire is φ, and H1 ≥ 0.2*φ;

[0017] The recessed depth of the recessed area is H2, and H2 ≥ 0.02 mm.

[0018] Optionally, the relative distance between the electrical connection part and the winding is D0, and D0 ≥ 0.05 mm.

[0019] Optionally, the winding includes a first coil and a second coil, the magnetic column is provided with a protrusion, the protrusion is located between the first coil and the second coil, the protrusion is provided with at least one wire groove, and the wire groove is used to accommodate a lead extending from one of the first coil and the second coil toward the other.

[0020] The present application provides a method for manufacturing an electromagnetic device, which is used to manufacture the electromagnetic device as described in any one of the above items, and the method comprises:

[0021] A magnetic column and two magnetic walls are provided, and the two magnetic walls are arranged at two ends of the magnetic column;

[0022] Providing a plurality of external terminals, the external terminals comprising a main electrode and an additional electrode connected to each other, the external terminals being arranged on corresponding magnetic walls, the additional electrodes being located at a first position relative to the main electrode, and the electrical connection portions being located outside the two magnetic walls;

[0023] Winding a lead wire around the magnetic column to form a winding, wherein the winding is located between the two magnetic walls;

[0024] At the first position, electrically connecting the lead wire of the winding to the electrical connection portion;

[0025] The additional electrode is bent from a first position to a second position relative to the main electrode, so that the electrical connection portion and the lead wire electrically connected thereto are located between two magnetic walls and are arranged opposite to the winding;

[0026] A magnetic cover plate is provided and connected to the first sides of the two magnetic walls to form a magnet with a closed magnetic circuit.

[0027] As described above, in the electromagnetic device and manufacturing method of the present application, the external terminal includes a main electrode and an additional electrode connected to each other. When the additional electrode is located at a first position relative to the main electrode, the electrical connection portion of the additional electrode is located outside the two magnetic walls. At this time, the lead of the winding is electrically connected to the electrical connection portion, and then the additional electrode is bent from the first position to the second position relative to the main electrode, so that the electrical connection portion and the lead electrically connected thereto are located between the two magnetic walls and are arranged relative to the winding. Even at the first position, the lead between the winding and the electrical connection portion is in a tight state. When the additional electrode is bent toward the winding to the second position, the distance between the winding and the electrical connection portion becomes smaller, and the lead at this position will not be in a tight state, thereby reducing the risk of the lead at this position being broken and the resulting product failure. In addition, the electrical connection portion is located between the two magnetic walls, that is, located inside the magnet, or on the inner side of the magnetic wall, thereby eliminating the risk of the electrical connection point between the lead and the electrical connection portion being hit and failing during use of the entire electromagnetic device. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic diagram of the three-dimensional structure of the electromagnetic device of the first embodiment of the present application from a first viewing angle;

[0029] Figure 2 yes Figure 1 A schematic diagram of the three-dimensional structure of the electromagnetic device shown in the second viewing angle;

[0030] Figure 3 yes Figure 1 A bottom view of the electromagnetic device shown;

[0031] Figure 4 yes Figure 2 A schematic structural diagram of the electromagnetic device when the additional electrode is located at a first position;

[0032] Figure 5 yes Figure 4 A bottom view of the electromagnetic device shown;

[0033] Figure 6 yes Figure 2 The schematic diagram of the structure of the electromagnetic device shown is not welded;

[0034] Figure 7 yes Figure 1 A schematic structural diagram of an external terminal of the electromagnetic device shown;

[0035] Figure 8 yes Figure 7 A schematic diagram of the structure when the additional electrode of the external terminal is located at a first position;

[0036] Fig. 9 yes Figure 1 The schematic diagram of the structure of the electromagnetic device shown is when no external terminals are provided;

[0037] Fig.10 is a schematic diagram of the three-dimensional structure of the electromagnetic device of the second embodiment of the present application from a first viewing angle;

[0038] Fig.11 yes Fig.10 A schematic diagram of the three-dimensional structure of the electromagnetic device shown in the second viewing angle;

[0039] Fig.12 yes Fig.10 A bottom view of the electromagnetic device shown;

[0040] Fig.13 yes Fig.12 A schematic structural diagram of the electromagnetic device when the additional electrode is located at a first position;

[0041] Fig.14 yes Fig.13 A bottom view of the electromagnetic device shown;

[0042] Fig.15 yes Fig.10 A schematic structural diagram of an external terminal of the electromagnetic device shown;

[0043] Fig.16 yes Fig.15 A schematic diagram of the structure when the additional electrode of the external terminal is located at a first position;

[0044] Fig.17 It is a flow chart of a method for manufacturing an electromagnetic device according to an embodiment of the present application.

[0045] The first direction is x, the second direction is y, and the third direction is z;

[0046] Electromagnetic device 100;

[0047] Magnet 1, notch 1a, magnetic cover plate 10, magnetic column 111, magnetic wall 112, protrusion 113;

[0048] Winding 2, lead wire 20, solder 21;

[0049] External terminal 3, main electrode 3a, additional electrode 3b;

[0050] Electrical connection portion 30, patch portion 31, side portion 32, extension portion 33, necking region 34;

[0051] A first sub-portion 301 , a second sub-portion 302 , and a recessed area 303 . DETAILED DESCRIPTION

[0052] In order to solve the above-mentioned technical problems existing in the prior art, in the electromagnetic device and the manufacturing method thereof of the present application, the external terminal includes a main electrode and an additional electrode connected to each other. When the additional electrode is located at a first position relative to the main electrode, the electrical connection portion of the additional electrode is located outside the two magnetic walls. At this time, the lead of the winding is electrically connected to the electrical connection portion, and then the additional electrode is bent from the first position to the second position relative to the main electrode, so that the electrical connection portion and the lead electrically connected thereto are located between the two magnetic walls and are arranged relative to the winding. Even at the first position, the lead between the winding and the electrical connection portion is in a tight state. Then, when the additional electrode is bent toward the winding to the second position, the distance between the winding and the electrical connection portion of the welding point becomes smaller, and the lead at this position will not be in a tight state, thereby reducing the risk of the lead at this position being broken.

[0053] The specific form of the parameters such as the shape, quantity, size, etc. of any of the magnets, windings, external terminals and their respective electrodes can be determined according to the adaptability required by the actual scenario, and this application does not limit it.

[0054] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be clearly described below in conjunction with specific embodiments and corresponding drawings. Obviously, the embodiments described below are only part of the embodiments of the present application, not all of the embodiments. In the absence of conflict, the following embodiments and their technical features can be combined with each other and also belong to the technical solutions of the present application.

[0055] In the description of the embodiments of the present application, terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", and "counterclockwise" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the technical solutions of the corresponding embodiments, rather than indicating or implying that a device or element must have a specific orientation, be constructed and operated in a specific orientation, and should not be understood as a limitation on the present application.

[0056] First embodiment

[0057] Please also read Figures 1 to 9 As shown, the electromagnetic device 100 of this example includes a magnet 1, a winding 2, and a plurality of external terminals 3. The number of external terminals 3 may be determined according to the adaptability of the type of the electromagnetic device 100. For example, the common mode inductor shown in the figure may be provided with four external terminals 3.

[0058] For ease of description and understanding, in combination with the placement orientation shown in the figure, the width direction of the electromagnetic device 100 is called the first direction x, the height direction is called the second direction y, and the thickness direction is called 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 the three coordinate axes of the three-dimensional rectangular coordinate system. It should be understood that the so-called verticality in the whole application does not require that the angle between the two must be 90°, but allows a deviation of, for example, ±10°, that is, the so-called verticality can be understood as the angle between any two directions is 80° to 100°. Similarly, the so-called parallelism in the whole application does not require that the 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 angle between any two directions is 0° to 10° or 170° to 190°.

[0059] The magnet 1 includes a magnetic cover plate 10 and a magnetic core, and has a closed magnetic circuit. The magnetic core includes a magnetic column 111 and two magnetic walls 112, the two magnetic walls 112 are arranged opposite to each other along a first direction x, and are respectively connected to the two ends of the magnetic column 111, and 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 an integrally formed structural part.

[0060] The magnetic wall 112 may be in the form of a plate or a block. Figure 1 The upper side of the magnetic wall 112 when placed in the orientation shown in the figure is connected to the magnetic cover plate 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 referred to as Figure 1 The lower side when placed in the orientation shown, the third side can be referred to as 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.

[0061] The winding 2 is wound around the magnetic column 111 and is located between the two magnetic walls 112. The winding 2 can be formed by winding a lead wire 20 of an enameled wire or the like in a circle, and the winding method is determined according to the adaptability, so that the lead wire 20 of the winding 2 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 shown, the electromagnetic device 100 is a common mode inductor, the winding 2 is provided with four lead wire 20 ends, and the electromagnetic device 100 is provided with four external terminals 3, and the four lead wire 20 ends are electrically connected to the four external terminals 3 one by one.

[0062] A plurality of external terminals 3 are bonded to the corresponding magnetic walls 112, for example, Figures 1 to 6 In the example shown, the electromagnetic device 100 is provided with four external terminals 3, two of which are bonded to one magnetic wall 112, and the other two external terminals 3 are bonded to another magnetic wall 112, and the two external terminals 3 on each magnetic wall 112 are sequentially spaced along the third direction z. The shapes of the four external terminals 3 can be the same or different. For ease of description, the entire text of this application and all drawings are described and shown as an example in which the shapes of the four external terminals 3 are the same.

[0063] See also Figure 7 and Figure 8 As shown, a single external terminal 3 includes a main electrode 3a and an additional electrode 3b connected to each other, wherein the additional electrode 3b is Figure 7 The dashed line selects the area.

[0064] The main electrode 3a includes a patch portion (equivalent to the commonly described "patch electrode") 31 and a side portion (equivalent to the commonly described "side electrode") 32, which are vertically connected and both in sheet form, and an extension portion 33. The patch portion 31 is arranged (for example, bonded) on the second side of the corresponding magnetic wall 112, and the patch portion 31 faces the circuit board and is used for SMT mounting. The side portion 32 is bonded to the third side of the corresponding magnetic wall 112, and the extension portion 33 is vertically connected to the patch portion 31, so that the main electrode 3a as a whole is a U-shaped structural member with one side long and one side short. The extension portion 33 is arranged on the fourth side of the corresponding magnetic wall 112, as shown in FIG. Figure 1 and Figure 8 In the example shown, a notch 1a may be provided on one side of the magnetic wall 112 facing the winding 2, and the extension portion 33 is accommodated in the notch 1a and bonded to one side of the notch 1a. Optionally, the lead 20 extending from the winding 2 of the final product may be accommodated in the notch 1a.

[0065] The additional electrode 3b is provided with an electrical connection portion 30, and the lead wire 20 of the winding 2 is electrically connected to the electrical connection portion 30. For example, the lead wire 20 of the winding 2 is wound around the electrical connection portion 30 and welded to the electrical connection portion 30, for example, by laser welding. The solder 21 during welding and the lead wire 20 melted by the high temperature of welding form a Figures 1 to 5 The lump-shaped structure shown. In other examples, the lead wire 20 of the winding 2 and the electrical connection part 30 can also be bonded by conductive adhesive to achieve the electrical connection. The embodiments and drawings of the present application are described by taking the example of the lead wire 20 being wound around the electrical connection part 30 and welded to the electrical connection part 30 to achieve the electrical connection. Here, the electrical connection part 30 can also be referred to as the welding part 30. Figure 1 In the example, one end of the additional electrode 3b is connected to the extension portion 33, which can be regarded as the additional electrode 3b being connected to the side of the main electrode 3a, and the electrical connection portion 30 is provided at the other end of the additional electrode 3b.

[0066] Combination Figure 4 , Figure 5 and Figure 8 As shown, the additional electrode 3b can be bent to a first position relative to the main electrode 3a. At this time, the additional electrode 3b is in a planar sheet shape as a whole, and the initial state of the external terminal 3 is Figure 4 , Figure 5 and Figure 8 In the state shown, the additional electrode 3b can also be regarded as not being bent, and when the additional electrode 3b is bonded to the magnet 1, the other end of the additional electrode 3b 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 .

[0067] 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 .

[0068] The additional electrode 3b can be connected to the main electrode 3a 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 wire 20 wound thereon are located between the two magnetic walls 112 and are arranged opposite to the winding 2. When the additional electrode 3b is bent to the second position, it can be regarded as the final product state of the electromagnetic device 100.

[0069] Based on the above, when the additional electrode 3b is located at the first position relative to the main electrode 3a, the electrical connection portion 30 of the additional electrode 3b is located outside the two magnetic walls 112, and the distance between the electrical connection portion 30 and the winding 2 is relatively far. At this time, the lead 20 of the winding 2 is wound around the electrical connection portion 30 and welded. The high temperature generated by welding will not affect the lead 20 in the winding 2, so damage to the lead 20 in the winding 2 can be avoided.

[0070] After the additional electrode 3b is bent from the first position to the second position relative to the main electrode 3a, the electrical connection part 30 and the lead 20 wound thereon are located between the two magnetic walls 112 and are arranged opposite to the winding 2. Even if the lead 20 between the winding 2 and the welding point (or the electrical connection part 20) is in a tight state at the first position, when the additional electrode 3b is bent toward the winding 2 to the second position, the distance between the winding 2 and the welding point becomes smaller, and the lead 20 at this position is not in a tight state, but presents a curve or arc state with a certain curvature, thereby eliminating the internal stress remaining after the lead 20 is wound and extended, and at the same time, it is convenient to absorb the stress generated by the entire electromagnetic device 100 during use. In addition, the electrical connection part 20 is located between the two magnetic walls 112, that is, located inside the magnet 1, or on the inner side of the magnetic wall 112, which can eliminate the risk of the welding point of the entire electromagnetic device 100 being hit and failing during use. It can be seen that the present application can reduce the risk of the lead wire 20 extending out of the winding 2 being broken, and reduce the risk of product failure caused thereby.

[0071] Optionally, the relative distance between the electrical connection part 30 and the winding 2 is D0, that is, the distance along the third direction z is D0, and D0 ≥ 0.05 mm, which can not only ensure good electrical insulation between the electrical connection part 30 and the winding 2, but also allow the electrical connection part 30 to extend further into the interior of the magnet 1, further helping to eliminate the risk of the welding point of the entire electromagnetic device 100 being hit and failing during use.

[0072] See also Figures 1 to 8As shown, a necking region 34 may be provided at the connection between the additional electrode 3b and the extension portion 33. The width of the necking region 34 is D1, the width of the additional electrode 3b is D2, and the width of the extension portion 33 is D3. The widths of these three refer to the lengths along the second direction y, and satisfy: D1 < D2 and D1 < D3; optionally, D2 < D3, and the width D1 of the necking region 34 also satisfies: 0.1*D3 ≤ D1 ≤ 0.95*D3. The necking region 34 is equivalent to narrowing the heat transfer channel between the electrical connection portion 30 and the extension portion 33, which can reduce the heat generated by the welding of the electrical connection portion 30 from being transmitted to the extension portion 33 and the electromagnetic device 100, that is, achieve thermal isolation, and improve or even eliminate the influence of this high temperature on the inductance performance.

[0073] In addition, the necking region 34 is equivalent to reducing the structural strength between the electrical connection portion 30 and the extension portion 33. The additional electrode 3b can be bent relative to the main electrode 3a at the necking region 34 to achieve switching between the first position and the second position. That is to say, the necking region 34 can be regarded as the bending line for the bending, which is convenient for the side pushing and folding of the electrical connection portion 30.

[0074] Please refer to Figure 7 and Figure 8 As shown, the electrical connection portion 30 may be provided with a first branch 301 and a second branch 302. The width of the first branch 301 is less than the width of the second branch 302, that is, the first branch 301 and the second branch 302 have a height difference along the second direction y, so that the first branch 301 and the second branch 302 form a stepped structure. In the example shown in the figure, the upper parts of the first branch 301 and the second branch 302 form a stepped structure, and the lower parts of the first branch 301 and the second branch 302 also form a stepped structure. The height differences of these two stepped structures can be equal. The lead 20 is wound around the first branch 301. This stepped structure is beneficial to the winding of the lead 20.

[0075] Optionally, the step height of the stepped structure is H1, that is, along the second direction y, the height difference between the upper side or the lower side of the first branch 301 and the second branch 302 is H1. The wire diameter of the lead 20 is φ, and H1 ≥ 0.2*φ; the height difference H1 within this value range is more beneficial to the winding of the lead 20.

[0076] In one example, the first branch 301 may be provided with a recessed region 303. The recessed direction (or the depth direction) of the recessed region 303 is parallel to the width direction of the first branch 301, that is, the first direction x. The recessed region 303 facilitates the lead 20 to be more closely attached to the first branch 301 when it is wound around the electrical connection portion 30. Optionally, the x-y cross-section of the recessed region 303 includes but is not limited to a V shape or an arc shape.

[0077] Optionally, the depression depth of the depression area 303 is H2, and H2≥0.02mm. The depression depth H2 within this range can ensure that the lead wire 20 is more closely attached to the first subsection 301 when wound on the electrical connection portion 30, ensuring the winding stability of the lead wire 20, and can also ensure the structural strength of the first subsection 301.

[0078] For electromagnetic devices 100 such as common mode inductors, the winding 2 may include at least two coils, see Figure 2 and Figure 3 As shown, taking two coils as an example, the winding 2 includes a first coil and a second coil, the magnetic column 111 may be provided with a protrusion 113, the protrusion 113 protrudes from the main part of the magnetic column 111, the protrusion 113 is located between the first coil and the second coil, and the protrusion 113 is provided with at least one wire groove (not shown in the figure), for example, provided on the bottom surface of the protrusion 113, the wire groove is used to accommodate the lead 20 extending from one of the first coil and the second coil toward the other. Through the protrusion 113, each coil and its lead 20 can be constrained to prevent the winding 2 from slipping and scattering between layers and crossing caused by slipping and scattering, thereby improving the consistency and stability of the product.

[0079] Second embodiment

[0080] For structural elements with the same name, the same reference numerals are used in this application to identify them.

[0081] Based on the description of the electromagnetic device 100 of the first embodiment, the difference is that in the electromagnetic device 100 of the second embodiment, for any external terminal 3, the main electrode 3a also includes a patch portion (equivalent to the commonly described "patch electrode") 31 and a side portion (equivalent to the commonly described "side electrode") 32 that are vertically connected and both in a sheet shape, and an extension portion 33. Of course, in other examples, the main electrode 3a may not be provided with the extension portion 33.

[0082] One end of the additional electrode 3b is directly connected to the side portion 32, not to the extension portion 33. The structure of the additional electrode 3b may be the same as that of the first embodiment, for example, an electrical connection portion 30 is also provided, and the electrical connection portion 30 is provided at the other end of the additional electrode 3b.

[0083] Combination Figures 10 to 16 As shown, the additional electrode 3b can be located relative to the main electrode 3a as follows Fig.13 and Fig.14 In the first position shown in FIG. 1 , after the lead wire 20 is wound and welded to the electrical connection portion 30 at the first position, the additional electrode 3b can be bent relative to the main electrode 3a to a position as shown in FIG. Figures 10 to 12The second position 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; in the second position, the electrical connection portion 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 additional electrode 3b is bent to the second position, it can be the final product state of the electromagnetic device 100. Here, the electromagnetic device 100 of the second embodiment can also have the beneficial effects produced by the aforementioned first embodiment.

[0084] The present application also provides a method for manufacturing an electromagnetic device, such as Fig.17 As shown, the method at least includes the following steps S1 to S6.

[0085] S1: Provide a magnetic column and two magnetic walls, and set the two magnetic walls at both ends of the magnetic column;

[0086] S2: providing a plurality of external terminals, the external terminals comprising a main electrode and an additional electrode connected to each other, setting the external terminals on the corresponding magnetic walls, and the additional electrodes are located at a first position relative to the main electrodes, and the electrical connection portion is located outside the two magnetic walls;

[0087] S3: Winding the lead wire around the magnetic column to form a winding, wherein the winding is located between two magnetic walls;

[0088] S4: At the first position, electrically connect the lead wire of the winding to the electrical connection portion;

[0089] S5: bending the additional electrode from a first position to a second position relative to the main electrode, so that the electrical connection portion and the lead wire electrically connected thereto are located between the two magnetic walls and are arranged opposite to the winding;

[0090] S6: Provide a magnetic cover plate, and connect the magnetic cover plate to the first sides of the two magnetic walls to form a magnet with a closed magnetic circuit.

[0091] In each step of the method, the materials, connection relationships and combination methods of each structural element can refer to the prior art and the description of the first and second embodiments mentioned above.

[0092] The method of this embodiment can be used to manufacture an electromagnetic device 100 as in any of the previous embodiments. Here, the beneficial effects produced by the electromagnetic device 100 of any of the previous examples are not described in detail here.

[0093] It should be noted that although the method uses step codes such as S1, S2, etc., the purpose is to express the corresponding content more clearly and concisely, and does not constitute a substantial limitation on the sequence. When implementing it specifically, those skilled in the art may execute S3 first and then S2, etc., but these should all be within the scope of protection of this application.

[0094] The above descriptions are only some embodiments of the present application, and are not intended to limit the patent scope of the present application. For ordinary technicians in this field, all equivalent structural changes made using the contents of this specification and drawings are also included in the patent protection scope of the present application.

[0095] Although the terms "first, second", etc. are used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. In addition, the singular forms "one", "an", and "the" are intended to include plural forms as well. The terms "or" and "and / or" are interpreted as inclusive, or mean any one or any combination. Only when the combination of elements, functions, steps, or operations is inherently mutually exclusive in some way, an exception to this definition will occur.

Claims

1. An electromagnetic device, characterized in that: Comprising: A magnet, including a magnetic cover plate and a magnetic core, the magnetic core including magnetic columns and two magnetic walls oppositely arranged at both ends of the magnetic columns in a first direction, and a first side of the magnetic wall being connected to the magnetic cover plate; A winding wound around the magnetic column and located between the two magnetic walls; A plurality of external terminals arranged on corresponding magnetic walls, the external terminals including a main electrode and an additional electrode connected to each other, and a lead of the winding being electrically connected to an electrical connection part of the additional electrode; the additional electrode can be bent relative to the main electrode to a first position or a second position, wherein, in the first position, the electrical connection part and the lead electrically connected thereto are located outside the two magnetic walls; in the second position, the electrical connection part and the lead electrically connected thereto are located between the two magnetic walls and are oppositely arranged to the winding.

2. The electromagnetic device according to claim 1, wherein The main electrode includes a patch part and a side part vertically connected, the patch part is arranged on a second side of the magnetic wall, the side part is arranged on a third side of the magnetic wall, the second side and the first side of the magnetic wall are oppositely arranged in a second direction and are both perpendicular to the third side; One end of the additional electrode is connected to the side part, and the electrical connection part is arranged at the other end of the additional electrode.

3. The electromagnetic device according to claim 1, wherein The main electrode includes a patch part, a side part and an extension part vertically connected, the patch part is arranged on a second side of the magnetic wall, the side part is arranged on a third side of the magnetic wall, the extension part is connected to the patch part and is arranged on a fourth side of the magnetic wall, the second side and the first side of the magnetic wall are oppositely arranged in a second direction and are both perpendicular to the third side, and the fourth side faces the magnetic column; One end of the additional electrode is connected to the extension part, and the electrical connection part is arranged at the other end of the additional electrode.

4. The electromagnetic device according to claim 3, characterized in that: A necking area is arranged at the connection between the additional electrode and the extension part, the width of the necking area is D1, the width of the additional electrode is D2, the width of the extension part is D3, D1 < D2 and D1 < D3; the additional electrode can be bent relative to the main electrode to the first position or the second position at the necking area.

5. The electromagnetic device according to claim 4, characterized in that: D2 < D3, and the width D1 of the necking area further satisfies: 0.1*D3 ≤ D1 ≤ 0.95*D3.

6. The electromagnetic device according to any one of claims 1 to 5, characterized in that: The electrical connection part is provided with a first branch and a second branch, the width of the first branch is smaller than the width of the second branch, so that the first branch and the second branch form a stepped structure, and the lead is wound around the first branch.

7. The electromagnetic device according to claim 6, characterized in that: The first branch is provided with a recessed area, and the recessed direction of the recessed area is parallel to the width direction of the first branch.

8. The electromagnetic device according to claim 7, characterized in that: Satisfying at least one of the following: The step height of the stepped structure is H1, the wire diameter of the lead is φ, and H1 ≥ 0.2*φ; The recessed depth of the recessed area is H2, and H2 ≥ 0.02 mm.

9. The electromagnetic device according to claim 1, characterized in that: The winding includes a first coil and a second coil, the magnetic column is provided with a protrusion, the protrusion is located between the first coil and the second coil, the protrusion is provided with at least one wire groove, and the wire groove is used to accommodate a lead extending from one of the first coil and the second coil toward the other.

10. A method for manufacturing an electromagnetic device, characterized in that: For manufacturing an electromagnetic device as claimed in any one of claims 1 to 9, the method comprises: A magnetic column and two magnetic walls are provided, and the two magnetic walls are arranged at two ends of the magnetic column; Providing a plurality of external terminals, the external terminals comprising a main electrode and an additional electrode connected to each other, the external terminals being arranged on corresponding magnetic walls, the additional electrodes being located at a first position relative to the main electrode, and the electrical connection portions being located outside the two magnetic walls; Winding a lead wire around the magnetic column to form a winding, wherein the winding is located between the two magnetic walls; At the first position, electrically connecting the lead wire of the winding to the electrical connection portion; The additional electrode is bent from a first position to a second position relative to the main electrode, so that the electrical connection portion and the lead wire electrically connected thereto are located between two magnetic walls and are arranged opposite to the winding; A magnetic cover plate is provided and connected to the first sides of the two magnetic walls to form a magnet with a closed magnetic circuit.

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