Magnetic device

Abstract

To improve the reliability of a magnetic device.SOLUTION: A magnetic device includes: a magnetic core (1) including a middle column (11) and side boards (12) connected to two ends of the middle column, a functional groove (6) being provided in each side board; windings (2) wound around the middle column according to a predetermined rule, two ends of each winding each having a winding lead (21); metal terminals (3) disposed to oppose to each other and connected to a side of each side board far away from the middle column at a predetermined interval, the winding lead being electrically connected to a welding part (31) of each metal terminal through the functional groove; a magnetic cover (4) connected to the magnetic core to form a closed magnetic circuit together with the magnetic core (1); and adhesive layers (5) each arranged between two of the side boards, the metal terminals, and the magnetic cover, and fixing the magnetic cover and the metal terminals to the magnetic core, respectively.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] This application relates to the technical field of magnetic devices, and specifically, to magnetic devices.

Background Art

[0002] Magnetic devices are widely used in the automotive field and are used to address problems related to power filtering and power conversion. By reducing common-mode noise in power lines, it helps ensure that electronic devices operate properly in automobiles. Magnetic devices can further effectively reduce electromagnetic interference by applying them to automotive wires and signal lines, support the automotive system to meet electromagnetic compatibility standards. In the actual operating state of an automobile, due to mechanical vibrations, uncertain mechanical shocks, an operating temperature range of -50°C to +150°C, various humidity conditions, salt spray conditions, altitude, etc., it poses great challenges to the reliable operation of magnetic devices in related technologies. To better meet the requirements for magnetic devices in the in-vehicle environment, it is necessary to design magnetic devices with excellent reliability.

Summary of the Invention

[0003] Therefore, this application provides a magnetic device for improving the reliability of magnetic devices.

[0004] To achieve the above objectives, the following technical means are adopted.

[0005] The magnetic device includes a middle foot portion and side end plates connected to both ends of the middle foot portion. A magnetic core is provided with functional grooves on the side end plates, and a winding wound around the middle foot portion according to a predetermined rule. Both ends of each winding have winding leads respectively. Metal terminals are arranged opposite to each other and connected to the side away from the middle foot portion of the side end plate at a predetermined interval. The winding leads are electrically connected to the welding portions of the metal terminals through the functional grooves. A magnetic cover is connected to the magnetic core to form a closed magnetic circuit with the magnetic core. An adhesive layer is provided between the side end plates, the metal terminals, and the magnetic cover to adhesively fix the magnetic cover and the metal terminals to the magnetic core respectively.

[0006] The present application further provides that a first fitting groove is provided on the side end plate, the metal terminal is fitted into the first fitting groove through the adhesive layer, and the groove depth of the first fitting groove is set to be not less than a first set multiple of the thickness of the metal terminal.

[0007] The present application further provides that the functional grooves are provided on the side of the side end plate away from the magnetic cover and located between adjacent metal terminals.

[0008] The present application further provides that a connection pin directed towards the side end plate is provided on one side of the metal terminal, and second fitting grooves connected and communicating with the first fitting groove are provided on both sides of the side end plate. The connection pin is fixed in the second fitting groove through the adhesive layer.

[0009] The present application further provides that a first external pin is integrally connected to the metal terminal, and the first external pin is engaged with the side away from the magnetic cover of the side end plate and protrudes from the outer surface of the side end plate.

[0010] The present application further provides that, taking the shortest distance from the side of the welding portion of the metal terminal close to the first external pin to the side of the first external pin away from the welding portion of the metal terminal as A and the width of the first external pin as B, 0.1B ≤ A ≤ B or B < A ≤ B + 1.5 mm.

[0011] The present application further provides that first auxiliary grooves are further provided on both sides of the side end plate, second auxiliary grooves are provided at positions on the side edges of the magnetic cover corresponding to the first auxiliary grooves, the first auxiliary grooves are connected and communicated with the second auxiliary grooves, and the adhesive layer is provided to be filled in the first auxiliary grooves and the second auxiliary grooves.

[0012] The present application further provides that a third auxiliary groove is provided on the side of the side end plate close to the magnetic cover, the third auxiliary groove is located between adjacent metal terminals, a fourth auxiliary groove is provided at a position on the magnetic cover corresponding to the third auxiliary groove, the third auxiliary groove is connected and communicated with the fourth auxiliary grooves, and the adhesive layer is provided to be filled in the third auxiliary grooves and the fourth auxiliary grooves.

[0013] The present application further provides that the functional grooves are arranged on both sides of the side end plate, a fifth auxiliary groove is provided at a position on the end of the magnetic cover corresponding to the metal terminal, a sixth auxiliary groove is provided on the side end plate, the first fitting groove and the fifth auxiliary groove are connected and communicated through the sixth auxiliary groove, and the adhesive layer is provided to be filled in the fifth auxiliary groove and the sixth auxiliary groove.

[0014] The present application further provides that a third fitting groove is provided in the first fitting groove, and the metal terminal is provided with a bent pin that is inserted into the third fitting groove and fixed to the third fitting groove through the adhesive layer.

[0015] The present application further provides that the metal terminal is provided with a fitting through hole that is connected to the bent pin or has a predetermined distance therefrom, and the adhesive layer is provided to extend into the fitting through hole.

[0016] The present application further provides that the functional grooves are arranged on the side edges of the side end plate and have functional inclined surfaces, a functional pin is integrally connected to one side of the metal terminal, the welding part is located on the functional pin, and the functional pin is provided to be in close contact with the functional inclined surface.

[0017] The present application further provides that the functional inclined surface inclines toward the middle foot portion and has a first direction and a predetermined inclination angle, and the winding lead is provided to be electrically connected to the welding portion on the functional pin through the functional inclined surface in a one-to-one correspondence with the functional pin.

[0018] The present application further provides that a functional table is integrally connected to the side of the side end plate away from the magnetic cover, the functional table protrudes from the functional inclined surface, a second external pin is connected to one side of the metal terminal, and the second external pin is engaged with the functional table and provided to protrude from the outer surface of the side end plate.

[0019] The present application further provides that a predetermined distance is provided between the symmetrically arranged second external pins, and the symmetrically arranged second external pins on the same side end plate are positioned between the symmetrically arranged functional inclined surfaces.

[0020] The present application further provides that a functional pin located in the first fitting groove is integrally connected to one side of the metal terminal, the welding portion is located on the functional pin, and the welding portion and the winding lead are provided to be positionally corresponding to the functional groove.

[0021] The present application further provides that the functional groove is connected to and communicates with the first fitting groove, and the connection portion between the functional groove and the first fitting groove is chamfered.

[0022] The present application further provides that a functional pin is provided on one side of the metal terminal, the welding portion is located on the functional pin, a constriction portion is provided between the functional pin and the metal terminal, both ends of the constriction portion are integrally connected to the functional pin and the metal terminal respectively, and the structural width of the constriction portion is a second set multiple of the structural width of the functional pin.

[0023] Furthermore, on one side of the metal terminal, a functional pin having a chamfered portion at one end is provided, the welding portion is located at the chamfered portion, and the winding lead is electrically connected to the welding portion after passing through the functional groove, and the extending direction of the winding lead and the side edge of the chamfered portion facing the functional groove are provided so as to have a set angle.

[0024] Furthermore, the middle foot portion and the side end plate that are integrally connected form an E-shaped structure or a drum-shaped structure, the portion where the side end plate protrudes from the middle foot portion constitutes a side panel, and the height of the side panel with respect to the middle foot portion is provided to be greater than the height of the winding with respect to the middle foot portion.

[0025] In summary, compared with the prior art, the present application discloses a magnetic device, a magnetic cover is connected to a magnetic core to form a closed magnetic circuit with the magnetic core, a winding is wound around the middle foot portion of the magnetic core according to a predetermined rule, metal terminals are arranged opposite to each other and are connected to the side away from the middle foot portion of the side end plate at a predetermined interval, a functional groove is provided on the side end plate, a winding lead is electrically connected to the welding portion of the metal terminal through the functional groove, and an adhesive layer is provided between the side end plate, the metal terminal and the magnetic cover to adhesively fix the magnetic cover and the metal terminal to the magnetic core respectively, thereby improving the structural reliability of the magnetic device and optimizing the overall performance of the magnetic device.

Brief Description of the Drawings

[0026] To more clearly explain the technical means in the embodiments of the present application, the drawings necessary for explaining the embodiments will be briefly described below. The drawings in the following description are only some embodiments of the present application, and it is obvious that those skilled in the art can also derive other drawings from these drawings without creative efforts.

Figure 1

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Embodiments for Carrying out the Invention

[0027] In this specification, exemplary embodiments are described in detail, and the examples are shown in the accompanying drawings. In the following description, when referring to the drawings, unless otherwise indicated, the same reference numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments that are consistent with the present application. Rather, they are merely examples of devices and methods that are consistent with some aspects of the present application that are described in detail in the appended claims.

[0028] In addition, in this specification, the terms "comprise", "include" or any other variation thereof are intended to cover non-exclusive inclusion, such that a process, method, article or apparatus that includes a series of elements not only includes these elements but also includes other elements not explicitly listed, or elements inherent to such a process, method, article or apparatus. Without further limitation, an element defined by the statement "include" does not exclude the presence of further identical elements in the process, method, article or apparatus that includes the element. Furthermore, components, features, and elements having the same name in different embodiments of this application may have the same meaning or different meanings, and the specific meaning needs to be determined based on the interpretation in that specific embodiment or in combination with the context of that specific embodiment.

[0029] It should be understood that the specific embodiments described herein are for the purpose of illustrating the present application and not for limiting the present application.

[0030] In the following description, suffixes used to represent elements such as "module", "component", or "unit" are only for the purpose of facilitating the description of the present application and have no special meaning in themselves. Therefore, "module", "component", or "unit" can be used interchangeably.

[0031] In the description of the present application, the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. These terms are only for the purpose of facilitating and simplifying the description of the present application and do not indicate or imply that the device or component mentioned must have a specific orientation and be configured and operate in a specific orientation. Therefore, it should not be understood as limiting the present application. Also, the terms "first", "second", "third" are only for the purpose of description and should not be understood as indicating or implying relative importance.

[0032] Hereinafter, the technical means according to the present application will be described in detail with reference to specific examples. Note that the order of description of the following examples does not limit the priority order of the examples.

[0033] As described in the background art, magnetic devices are widely used in automotive systems. However, in the actual operating state of an automobile, due to mechanical vibrations, uncertain mechanical shocks, an operating temperature of -50°C to +150°C, various humidity conditions, salt spray conditions, altitude, etc., magnetic devices in related technologies do not have reliability suitable for them. Therefore, their good operating life cannot be ensured. For this reason, the present application discloses a magnetic device.

Example

[0034] Referring to FIG. 1, the magnetic device of this example includes a magnetic core 1, a winding 2, a metal terminal 3, a magnetic cover 4, and an adhesive layer 5. Specifically, the magnetic core 1 includes a middle foot portion 11 and side end plates 12 connected to both ends of the middle foot portion 11. The winding 2 is wound around the middle foot portion 11 according to a predetermined rule, and both ends of each winding 2 have winding leads 21 respectively. The metal terminals 3 are arranged opposite to each other and are connected to the side away from the middle foot portion 11 of the side end plate 12 at a predetermined interval. The magnetic cover 4 is connected to the magnetic core 1 to form a closed magnetic circuit with the magnetic core 1. The adhesive layer 5 is provided between the side end plate 12, the metal terminal 3, and the magnetic cover 4 to adhesively fix the magnetic cover 4 and the metal terminal 3 to the magnetic core 1 respectively. When specifically implemented, a functional groove 6 is provided on the side end plate 12. By electrically connecting the winding lead 21 through the functional groove 6 to the welding portion 31 of the metal terminal 3, the winding lead 21 passing through the functional groove 6 is guided to be connected to the metal terminal 3 located on the side away from the middle foot portion 11 of the side end plate 12 after passing over the side end plate 12 from the middle foot portion 11. By having a sufficient physical separation space between the connection point of the winding lead 21 and the welding portion 31 and the winding 2, the structural reliability of the magnetic device is improved, and the overall performance of the magnetic device is optimized. Furthermore, a first fitting groove 13 is provided in the side end plate 12, and the metal terminal 3 is fitted into the first fitting groove 13 via the adhesive layer 5, so that the metal terminal 3 and the magnetic core 1 are stably and integrally connected. The contour shape of the metal terminal 3 may conform to the groove shape of the first fitting groove 13 so that the metal terminal 3 can be easily fixed to the magnetic core 1. The groove depth of the first fitting groove 13 is equal to or greater than a first set multiple of the thickness of the metal terminal 3. That is, the first fitting groove 13 protects the metal terminal 3 by the groove wall or regulates the connection relationship of the metal terminal 3 by the groove contour, so that the fitting between the metal terminal 3 and the first fitting groove 13 can be made strong and clean. The numerical range of the first set multiple in this embodiment may include 0.1 to 1.2, that is, the groove depth of the first fitting groove 13 is (0.1 to 1.2) times the thickness of the metal terminal 3. Considering that the adhesive layer 5 adhesively fixes the metal terminal 3 to the magnetic core 1, that is, when the groove depth of the first fitting groove 13 is equal to 1.2 times the thickness of the metal terminal 3, the outer surface of the metal terminal 3 is flush with the outer surface of the side end plate 12. That is, the thickness between the first fitting groove 13 of the adhesive layer 5 and the metal terminal 3 is 0.2 times the thickness of the metal terminal 3. When 0.1 ≤ first set multiple < 1.2, the metal terminal 3 protrudes from the first fitting groove 13. Preferably, the first set multiple may further be a fixed value including 0.25 times, 0.4 times, 0.6 times, 0.8 times or 1.0 times. A first external pin 32 that engages with the side of the metal terminal 3 away from the magnetic cover 4 of the side end plate 12 and protrudes from the outer surface of the side end plate 12 is integrally connected to the metal terminal 3. That is, the first external pin 32 stabilizes the connection relationship between the metal terminal 3 and the magnetic core 1, and the first external pin 32 protruding from the side end plate 12 can also be easily externally attached to the magnetic device. The first external pins 32 of this embodiment may be provided symmetrically with respect to the side end plate 12, and in order to facilitate the external attachment of the magnetic device, the spaces between the first external pins 32 may be located in the same plane and parallel to the side end plate 12. The first external pin 32 may be integrally formed with the metal terminal 3 and orthogonal to the metal terminal 3 so that the metal terminal 3 can be conveniently and reliably mounted on the magnetic core 1. Note that welding parts 31 are integrally connected to the respective metal terminals 3. After the winding lead 21 guided by the functional groove 6 passes from the middle foot part 11 over the side end plate 12, it is fixed to and electrically connected to the welding part 31 located on the side away from the middle foot part 11 of the side end plate 12. Here, the fixing method may be laser welding fixation or thermocompression bonding fixation. The end of the welding part 31 away from the metal terminal 3 may be further provided with a spherical structure, which ensures that the winding lead 21 can be easily and quickly wound around the welding part 31. The smooth spherical structure can prevent damage to the winding lead 21, that is, through the end provided as the spherical structure, it is ensured that the winding lead 21 can be aligned and uniformly act on the welding part 31. Of course, the structural shape of the welding part 31 in this embodiment is not limited to this, and other shapes that facilitate the fixing of the winding lead 21 may be used, so the description thereof is omitted here. The winding leads 21 of this embodiment are drawn out corresponding to both ends of the winding 2. Taking two stacked windings 2 as an example, the windings 2 at the same end can draw out two winding leads 21 corresponding to different layers. After these two winding leads 21 pass through the functional groove 6, they are wound one-to-one corresponding to the symmetrically arranged welding parts 31, which facilitates the subsequent welding fixation and the construction of the coil loop. To prevent the adjacent metal terminals 3 from accidentally contacting each other, the metal terminals 3 on the side end plate 12 are arranged opposite to each other with a predetermined interval, and the winding 2 is wound according to a predetermined rule. Here, the predetermined rule may be to select a plurality of windings 2 with the same winding direction so as to reduce the leakage inductance, or adopt an alternating direction design, or define the number of layers of the winding 2, the winding density of the winding 2, and the material of the wire used for the winding 2, etc. It should be understood that this is also possible. Specifically, when implementing, there is an adhesive layer 5 for fixing between the side end plate 12 and the metal terminal 3. Similarly, there is also an adhesive layer 5 between the side end plate 12 and the magnetic cover 4 and between the metal terminal 3 and the magnetic cover 4. Thus, the adhesive layer 5 easily fixes and adheres the magnetic cover 4 and the metal terminal 3 to the magnetic core 1 respectively, ensuring the structural stability of the entire magnetic device. Furthermore, the middle foot portion 11 and the side end plate 12 are integrally connected to form an E-shaped structure or a drum-shaped structure. The portion where the side end plate 12 protrudes from the middle foot portion 11 constitutes the side panel 8. The height of the side panel 8 with respect to the middle foot portion 11 is greater than the height of the winding 2 with respect to the middle foot portion 11, so that the winding 2 can be easily wound, facilitating the construction of a closed magnetic circuit between the magnetic cover 4 and the magnetic core 1. The first external pin 32 of this embodiment can extend until it is flush with the side panel 8. Based on the structural design of the side panel 8, the magnetic device of this embodiment can prevent magnetic loss and reduce the leakage magnetic flux of the magnetic core 1, thereby reducing the influence on surrounding electromagnetic sensitive devices during actual operation, so that the overall performance of the magnetic device can be improved. Both the magnetic core 1 and the magnetic cover 4 are made of magnetic materials. To meet the operating requirements of the magnetic device, this magnetic material may include one or more of ferrite materials, magnetic metal alloy materials, ferrosilicon alloy materials, or soft magnetic materials. The middle foot portion 11 of this embodiment may be provided in a rectangular body structure so that the winding 2 can be laminated more easily, that is, to provide more winding space. The edges and corners of the rectangular body are used to adjust the magnetic field distribution of the magnetic device, contributing to the optimization of the performance of the inductance element and making processing and manufacturing easier in the manufacturing process. The winding 2 of this embodiment may use a copper enameled wire material and is composed of at least one enameled wire. Metal copper is an excellent conductive material with low resistance characteristics. By using copper enameled wire as the winding 2, the resistance of the inductance element can be reduced and the current propagation efficiency can be improved. And copper has excellent thermal conductivity and can effectively conduct heat from the winding 2, preventing the reduction or damage of the inductance performance due to over-temperature. On the other hand, copper enameled wire usually can withstand relatively high temperatures, so it is suitable for use in some high-temperature environments, which is very important for magnetic devices that need to operate under high-temperature conditions. It should be understood that copper enameled wire has relatively high corrosion resistance and can resist the corrosion of some chemical substances, thereby extending the service life of the magnetic device.

Embodiment

[0035] Referring to FIGS. 1, 2 and 3, in this embodiment, the same reference numerals as those in Embodiment 1 are used, and based on the entire technical means of Embodiment 1, the functional groove 6 of this embodiment is on the side away from the magnetic cover 4 of the side end plate 12 and is located between adjacent metal terminals 3. When specifically implemented, the functional groove 6 is located between adjacent metal terminals 3, the winding lead 21 is electrically connected to the welding part 31 of the metal terminal 3 through the functional groove 6, and by restricting the position of the functional groove 6, the winding leads 21 of each winding 2 may be connected to the metal terminal 3 through the functional groove 6 at the same end together, optimizing the structural processing of the magnetic core 1, and improving the cost performance of the magnetic device. Furthermore, a connection pin 33 directed towards the side end plate 12 is provided on one side of the metal terminal 3, and second fitting grooves 14 connected and communicating with the first fitting groove 13 are provided on both sides of the side end plate 12. The connection pin 33 is fixed in the second fitting groove 14 through the adhesive layer 5. That is, through the structural design of the first fitting groove 13 and the second fitting groove 14, it is ensured that the metal terminal 3 is fixed to the side end plate 12 through the connection pin 33, and the metal terminal 3 and the magnetic core 1 are stably and integrally connected, thereby improving the structural reliability of the magnetic device. A third fitting groove 15 is provided in the first fitting groove 13 of this embodiment, and a bent pin 34 inserted into the third fitting groove 15 and fixed to the third fitting groove 15 through the adhesive layer 5 is integrally connected to the metal terminal 3, thereby improving the structural reliability of the magnetic device. Furthermore, a fitting through hole 35 connected to the bent pin 34 is provided on the metal terminal 3. By extending the adhesive layer 5 into the fitting through hole 35, the fitting through hole 35 and the adhesive layer 5 are fitted by the bent pin 34, strengthening the connection relationship between the bent pin 34 and the third fitting groove 15, and further fixing the metal terminal 3 to the magnetic core 1 to ensure the stability of the entire structure of the magnetic device. When specifically implemented, in order to strengthen the connection relationship between the side end plate 12 and the magnetic cover 4, first auxiliary grooves 71 are further provided on both sides of the side end plate 12, and second auxiliary grooves 72 are provided at positions on the side edges of the magnetic cover 4 corresponding to the first auxiliary grooves 71. The first auxiliary grooves 71 are connected to and communicate with the second auxiliary grooves 72. By filling the adhesive layer 5 into the first auxiliary grooves 71 and the second auxiliary grooves 72, the magnetic cover 4 and the magnetic core 1 are stably and integrally connected by the adhesive layer 5, improving the structural reliability of the magnetic device. Furthermore, a third auxiliary groove 73 may be further provided on the side of the side end plate 12 close to the magnetic cover 4. The third auxiliary groove 73 is located between adjacent metal terminals 3. A fourth auxiliary groove 74 is provided at a position on the magnetic cover 4 corresponding to the third auxiliary groove 73. The third auxiliary groove 73 is connected to and communicates with the fourth auxiliary groove 74. The adhesive layer 5 is filled into the third auxiliary groove 73 and the fourth auxiliary groove 74, that is, the stable connection relationship between the magnetic cover 4 and the magnetic core 1 is further strengthened by the adhesive layer 5. In addition, the third auxiliary groove 73 may be correspondingly positioned with the functional groove 6, that is, the third auxiliary groove 73 calibrates the fitting position between the magnetic cover 4 and the magnetic core 1 to prevent unintentional displacement or deviation of the magnetic cover 4, thereby ensuring the integrity of the overall structure of the magnetic device. Since the cross-sectional contour of the first auxiliary groove 71, the second auxiliary groove 72, the third auxiliary groove 73 or the fourth auxiliary groove 74 in this embodiment is arc-shaped, serrated, triangular or wedge-shaped, sufficient contact between the adhesive layer 5 and the auxiliary groove and fixed adhesion after contact are ensured, thereby ensuring the connection stability of the entire magnetic device. When specifically implementing, referring to FIG. 2, taking the shortest distance from the side of the welding part 31 of the metal terminal 3 close to the first external pin 32 to the side away from the welding part 31 of the metal terminal 3 of the first external pin 32 as A, and the width of the first external pin 32 as B, then 0.1B ≤ A ≤ B. By defining this dimension, it is prevented that in the vertical projection from the magnetic cover 4 towards the first external pin 32, the welding part 31 completely shields the first external pin 32. Since the first external pin 32 needs solder for electrical connection to the outside, for example, when it is necessary to observe whether the height on the outer surface of the side of the first external pin 32 located in the first fitting groove 13 is 1 / 3 to 1 / 2 of the solder height, it should be understood that based on the feature definition of 0.1B ≤ A ≤ B, the soldering state of the first external pin 32 can be made easy, quick, and clear. On the other hand, when B < A ≤ B + 1.5 mm, in the vertical projection from the magnetic cover 4 towards the first external pin 32, the welding part 31 can clearly show the soldering state of the first external pin 32 with a significant gap or distance from the first external pin 32. Of course, in this embodiment, a certain multiple may be further provided. That is, taking the shortest distance from the side of the welding part 31 of the metal terminal 3 close to the first external pin 32 to the side away from the welding part 31 of the metal terminal 3 of the first external pin 32 as A, and the width of the first external pin 32 as B, then A = 0.25B, A = 0.5B, or A = 0.8B. When A = 0.25B, in the vertical projection from the magnetic cover 4 towards the first external pin 32, the welding part 31 shields 3 / 4 of the first external pin 32. Similarly, when A = 0.5B, the welding part 31 shields 1 / 2 of the first external pin 32. When A = B, the welding part 31 is considered to block the side of the first external pin 32 and be completely exposed from the first external pin 32. The magnetic cover 4 of this embodiment is connected to the magnetic core 1 to form a closed magnetic circuit with the magnetic core 1. The winding 2 is wound around the middle foot portion 11 of the magnetic core 1 according to a predetermined rule. The metal terminals 3 are arranged oppositely and arranged on the side end plates 12 at both ends of the middle foot portion 11 with a predetermined interval. On the side of the side end plate 12 away from the magnetic cover 4, a functional groove 6 is provided between adjacent metal terminals 3. The winding leads 21 at both ends of each layer of the winding 2 are electrically connected to the welding part 31 of the metal terminal 3 through the functional groove 6. The metal terminal 3 is adhered in the first fitting groove 13 on the side end plate 12. The metal terminal 3 fits to the side end plate 12 through the connection pin 33, the bending pin 34 and the fitting through hole 35. By improving the structural reliability of the magnetic device as a whole through the enhanced adhesion of the adhesive layer 5, the comprehensive performance of the magnetic device is improved.

Embodiment

[0036] Referring to FIGS. 4, 5 and 6, this embodiment uses the same reference numerals as the above-described embodiment. This embodiment has the same technical means as the above-described embodiment, namely, the magnetic core 1, the winding 2, the metal terminal 3, the magnetic cover 4 and the adhesive layer 5. That is, the magnetic core 1 includes a middle foot portion 11 and side end plates 12 connected to both ends of the middle foot portion 11. The winding 2 is wound around the middle foot portion 11 according to a predetermined rule. Both ends of each winding 2 respectively have winding leads 21. The metal terminals 3 are arranged oppositely and connected to the side away from the middle foot portion 11 of the side end plate 12 at a predetermined interval. The magnetic cover 4 is connected to the magnetic core 1 to form a closed magnetic circuit with the magnetic core 1. The adhesive layer 5 is provided between the side end plate 12, the metal terminal 3 and the magnetic cover 4 to adhesively fix the magnetic cover 4 and the metal terminal 3 to the magnetic core 1 respectively. A functional groove 6 is provided on the side end plate 12. The winding lead 21 is electrically connected to the welding part 31 of the metal terminal 3 through the functional groove 6. A first fitting groove 13 is provided on the side end plate 12. The metal terminal 3 is fitted into the first fitting groove 13 through the adhesive layer 5. Based on the overall technical means of the above-described embodiment, the functional grooves 6 of this embodiment are arranged on both sides of the side end plate 12. When specifically implemented, the functional grooves 6 are arranged on both sides of the side end plate 12. To protect the winding leads 21 located on the sides of the side end plate 12, the groove depth of the functional grooves 6 is greater than the wire diameter of the winding leads 21. The winding leads 21 are guided by the functional grooves 6, and the winding leads 21 of each winding 2 may be connected to the welding part 31 of the metal terminal 3 through the functional grooves 6 on both sides of the side end plate 12 at the same end respectively. By optimizing the structural processing of the magnetic core 1, the cost performance of the magnetic device can be improved. Furthermore, a fifth auxiliary groove 75 is provided at the end of the magnetic cover 4 corresponding to the metal terminal 3, and a sixth auxiliary groove 76 is provided on the side end plate 12. The first auxiliary groove 13 and the fifth auxiliary groove 75 are connected and communicated through the sixth auxiliary groove 76. By filling the adhesive layer 5 into the first auxiliary groove 13, the fifth auxiliary groove 75 and the sixth auxiliary groove 76, the fixation between the magnetic cover 4 and the magnetic core 1 is ensured. Furthermore, the magnetic core 1, the metal terminal 3 and the magnetic cover 4 are stably and integrally connected by the adhesive layer 5, improving the structural reliability of the magnetic device. By filling the adhesive layer 5 located in the fifth auxiliary groove 75 or the sixth auxiliary groove 76 into half or all of the fifth auxiliary groove 75 or the sixth auxiliary groove 76, the fixation between the magnetic cover 4 and the magnetic core 1 is ensured. To make the adhesive layer 5 extend better in the fifth auxiliary groove 75, a bellmouth structure may be provided at the end of the fifth auxiliary groove 75 facing the side end plate 12, that is, the fifth auxiliary groove 75 may gradually shrink from one end of the side end plate 12 to one end of the magnetic cover 4 in the groove structure. In addition, the position of the fifth auxiliary groove 75 in the magnetic cover 4 may correspond to the metal terminal 3, that is, the symmetric fifth auxiliary groove 75 further calibrates the fitting position between the magnetic cover 4 and the magnetic core 1, preventing the unintended displacement or deviation of the magnetic cover 4, thereby ensuring the alignment of the entire structure of the magnetic device. In this embodiment, the shortest distance from the side of the welding part 31 of the metal terminal 3 near the first external pin 32 to the side away from the welding part 31 of the metal terminal 3 of the first external pin 32 is set as A, and the width of the first external pin 32 is set as B. Then, 0.1B ≦ A ≦ B, or B < A ≦ B + 1.5 mm. With this setting, the soldering state of the first external pin 32 can be grasped, and the description is omitted here. A third fitting groove 15 is provided in the first fitting groove 13 of this embodiment. A bent pin 34 that is inserted into the third fitting groove 15 and fixed to the third fitting groove 15 via an adhesive layer 5 is integrally connected to the metal terminal 3. A fitting through hole 35 is provided in the metal terminal 3. The fitting through hole 35 is spaced apart from the bent pin 34 by a predetermined distance, and the connection relationship between the bent pin 34 and the third fitting groove 15 is strengthened by the fitting through hole 35 and the adhesive layer 5, thereby fixing the metal terminal 3 to the magnetic core 1 and ensuring the stability of the entire structure of the magnetic device.

Embodiment

[0037] Referring to FIGS. 4, 5 and 6, this embodiment uses the same reference numerals as in Embodiment 3. Based on the overall technical means of Embodiment 3, the adhesive layer 5 of this embodiment may include an adhesive main body portion 50, a first adhesive portion 51, a second adhesive portion 53 and a fourth adhesive portion 54. Specifically, when implementing, the first adhesive portion 51 is integrally connected to the adhesive main body portion 50. The adhesive main body portion 50 is connected between the side end plate 12 and the metal terminal 3. The first adhesive portion 51 extends into the fifth auxiliary groove 75 and the sixth auxiliary groove 76. That is, based on the structural design of the adhesive layer 5, the adhesive main body portion 50 is adhesively fixed to the side end plate 12 and the metal terminal 3 respectively. The first adhesive portion 51 ensures the fixation between the magnetic cover 4 and the magnetic core 1 by the combination of the fifth auxiliary groove 75 and the sixth auxiliary groove 76. Further, the magnetic core 1, the metal terminal 3 and the magnetic cover 4 are stably integrally connected by the adhesive layer 5, improving the structural reliability of the magnetic device. Furthermore, the first adhesive portion 51 extending into the fifth auxiliary groove 75 or the sixth auxiliary groove 76 is filled with half or all of the groove of the fifth auxiliary groove 75 or the sixth auxiliary groove 76 to ensure the fixation between the magnetic cover 4 and the magnetic core 1. A bellmouth structure may be provided at the end of the fifth auxiliary groove 75 facing the side end plate 12 so that the first adhesive portion 51 extends better into the fifth auxiliary groove 75. That is, the fifth auxiliary groove 75 may gradually narrow from one end of the side end plate 12 toward one end of the magnetic cover 4 in the groove structure. In order to further improve the stable connection relationship between the magnetic cover 4 and the magnetic core 1, the adhesive layer 5 may include a second adhesive portion 52 integrally connected to the adhesive main body portion 50. The second adhesive portion 52 is connected between the side end plate 12 and the magnetic cover 4. Specifically, the side end plate 12 and the magnetic cover 4 face each other with a uniform gap, and the second adhesive portion 52 extends from the adhesive main body portion 50 and is sufficiently filled in this gap, so that the side end plate 12 and the magnetic cover 4 can be firmly fixed. On the other hand, a built-in groove may be further provided on the side of the side end plate 12 facing the magnetic cover 4 and / or on the side of the magnetic cover 4 facing the side end plate 12. By further accommodating the second adhesive portion 52 in the built-in groove, the fixation between the side end plate 12 and the magnetic cover 4 is ensured. The third adhesive portion 53 of this embodiment is integrally connected to the adhesive main body portion 50. By filling the third adhesive portion 53 between the third fitting groove 15 and the bending pin 34, a stable connection between the bending pin 34 and the third fitting groove 15 is ensured through the third adhesive portion 53, and the stable connection relationship between the metal terminal 3 and the magnetic core 1 is further significantly strengthened. Furthermore, the fourth adhesive portion 54 is integrally connected to the bending pin 34 and is filled in the fitting through hole 35. In order to ensure the filling effect, the filling height of the fourth adhesive portion 54 in the fitting through hole 35 may be 1 / 3 or more of the thickness of the metal terminal 3. By fixing the metal terminal 3 to the magnetic core 1 through the fitting through hole 35 and the fourth adhesive portion 54, the stability of the entire structure of the magnetic device is ensured. It should be understood that the first adhesive portion 51, the second adhesive portion 52, the third adhesive portion 53, and the fourth adhesive portion 54 of this embodiment all extend from the adhesive main body portion 50 in the structural design of the side end plate 12 and the magnetic cover 4. That is, the adhesive layer 5 has an excellent fixing effect among the magnetic core 1, the metal terminal 3, and the magnetic cover 4 as a whole, thereby improving the reliability of the entire structure of the magnetic device.

Example

[0038] Referring to FIGS. 7 and 8, this embodiment uses the same reference numerals as the above-described embodiments and is based on the entire technical means of the above-described embodiments. The functional groove 6 of this embodiment is arranged on the side of the side end plate 12 and has a functional slope. When specifically implementing, taking the X-Y plane coordinates constructed in FIG. 8 as an example, the X-axis direction can be regarded as the first direction of this embodiment, and the Y-axis direction can be regarded as the second direction of this embodiment. Of course, this embodiment is not limited thereto. In the actual mounting requirements, X-Y may be any other two directions that are perpendicular to each other in space, and the description thereof is omitted here. Furthermore, a functional pin 36 is integrally connected to one side of the metal terminal 3. The welding part 31 is located on the functional pin 36 so as to form a terminal pad. The functional pin 36 is in close contact with the functional inclined surface of the functional groove 6, and the winding lead 21 is electrically connected to the welding part 31 of the functional pin 36 through the functional inclined surface in a one-to-one correspondence with the functional pin 36. The functional inclined surface of the functional groove 6 is inclined toward the middle foot part 11 and has a predetermined inclination angle with the first direction. The functional pin 36 of this embodiment is arranged to be in close contact with the functional inclined surface of the functional groove 6, that is, the functional pin 36 is inclined from the second direction toward the first direction, and the functional pin 36 is similarly inclined toward the winding 2 and has the same predetermined inclination angle as the functional inclined surface of the functional groove 6 with the first direction, thereby ensuring a strict close contact relationship between the functional pin 36 and the functional inclined surface of the functional groove 6. The sides of the functional pin 36 facing the functional inclined surface of the functional groove 6 may all be flat, that is, the functional pin 36 and the functional inclined surface of the functional groove 6 may be in close contact without a gap. Based on the structural design that the functional inclined surface of the functional groove 6 is inclined toward the middle foot part 11 and has a predetermined inclination angle with the first direction, and the winding leads 21 of each winding 2 correspond to the functional pins 36 one-to-one, the winding leads 21 of each winding 2 respectively correspond to the functional pins 36 at the same end, and the functional inclined surface of the functional groove 6 guides the pulling out of the winding leads 21 and provides a safe space for the winding leads 21, thereby ensuring a safe and firm electrical connection relationship between the winding leads 21 and the metal terminal 3, and further ensuring a highly reliable operation of the magnetic device. It should be understood that the functional groove 6 is provided on the side of the side end plate 12, or the functional inclined surface of the functional groove 6 is provided on the side away from the winding 2 of the side end plate 12 and the functional inclined surface is connected to and communicates with the side wall of the side end plate 12, so that it can function as a positioning groove to facilitate the assembly of the metal terminal 3. In this embodiment, based on the structural design of the functional slope of the functional groove 6, when the functional slope of the functional groove 6 has sufficient clearance space with respect to the side end plate 12, and further when the winding lead 21 is electrically connected to the functional pin 36, the connection point is within the clearance space, that is, the connection point does not affect the longitudinal dimension of the magnetic device, and there is no risk of accidentally rubbing the winding lead 21 by protruding from the side end plate 12. Moreover, a sufficient physical separation space is ensured between the connection point of the winding lead 21 and the functional pin 36 and the winding 2, so that the risk of melting the winding 2 at high temperature when the winding lead 21 and the functional pin 36 are welded and fixed can be avoided, and the contamination of the winding 2 by foreign matters during welding can be prevented, thereby improving the structural reliability of the magnetic device. In this embodiment, when the functional slope of the functional groove 6 inclines towards the middle foot portion 11 and the predetermined inclination angle with the first direction is Q, the size range of Q is 5 to 80°, so as to ensure that the functional slope of the functional groove 6 has sufficient clearance space with respect to the side end plate 12. Further, the winding lead 21 can be in close contact with the functional pin 36 along this inclination, which can help fix the winding lead 21 and reduce its vibration and displacement. Preferably, in order to ensure that the functional slope of the functional groove 6 has sufficient clearance space with respect to the side end plate 12, and further the winding lead 21 is in close contact with the functional pin 36 along this inclination, and the inclination of the functional slope of the functional groove 6 can hide the connection point between the winding lead 21 and the functional pin 36, the size range of Q may be 20 to 70°, 30 to 60°, and 40 to 50°. In some embodiments, when the functional slope of the functional groove 6 inclines towards the middle foot portion 11 and the predetermined inclination angle with the first direction is Q, Q is 45°. In some embodiments, when the functional slope of the functional groove 6 inclines towards the middle foot portion 11 and the predetermined inclination angle with the first direction is Q, Q is 10°. When specifically implemented, what is different from the first external pin 32 of the above-described embodiment is that a functional table 16 is integrally connected to the side away from the magnetic cover 4 of the side end plate 12 of this embodiment. The functional table 16 protrudes from the functional slope of the functional groove 6, and a second external pin 17 is connected to one side of the metal terminal 3. The second external pin 17 engages with the functional table 16 so that the magnetic device can be easily externally attached via the second external pin 17 and protrudes from the outer surface of the side end plate 12. Furthermore, there is a predetermined distance between the symmetrically arranged second external pins 17, and the symmetrically arranged second external pins 17 are located between the symmetrically arranged functional grooves 6 on the same side end plate 12. The second external pin 17 may be orthogonal to the metal terminal 3, that is, the second external pin 17 may have a bending angle of 90° with the metal terminal 3. And in order to easily arrange the entire structure of the magnetic device, the second external pin 17 may be parallel to the functional table 16 on the side end plate 12. Furthermore, the structural processing of the magnetic device can be optimized to improve the cost performance of the magnetic device. In some embodiments, the second external pin 17 may be orthogonal to the second direction and parallel to the first direction. It should be noted that in this embodiment, there is a predetermined distance between the symmetrically arranged second external pins 17, and the symmetrically arranged second external pins 17 are located between the symmetrically arranged functional grooves 6 on the same side end plate 12. That is, when the magnetic device and the external system are connected via the second external pin 17, the functional slope of the functional groove 6 provides a sufficient safety space for the wiring of the winding lead 21 in accordance with the functional table 16, and prevents excessive contact between the winding lead 21 and the outside, thereby reducing the risk of accidentally rubbing the winding lead 21 and improving the operating safety of the magnetic device. The welding part 31 of this embodiment inclines toward the middle foot part 11 along with the functional slope. Specifically, the winding lead 21 realizes an electrical connection with the functional pin 36 via the welding part 31, and the connection method is realized by welding. However, in order to perform welding easily and quickly, the welding part 31 may be provided in an oblate spherical structure. When specifically implemented, since the first fitting groove 13 is connected to and communicates with the functional slope, and the adhesive layer 5 in the first fitting groove 13 can extend to the functional slope of the functional groove 6, the fixing of the functional pin 36 and the side end plate 12, and the fixing of the winding lead 21 and the side end plate 12 are enhanced, the structural reliability of the magnetic device as a whole is ensured, the performance of the magnetic device is optimized. Similarly, since the adhesive layer 5 can extend to the outer surface of the functional table 16, the fixing relationship between the second external pin 17 and the side end plate 12 is enhanced. That is, functional grooves 6 having functional slopes are symmetrically provided on the side of the side end plate 12. The functional slopes of the functional grooves 6 are inclined toward the middle foot portion 11 and have a predetermined inclination angle in the first direction. The functional pins 36 are arranged to be in close contact with the functional slopes, and the winding leads 21 are electrically connected to the functional pins 36 via the functional slopes in a one-to-one correspondence with the functional pins 36, thereby improving the structural reliability of the magnetic device and optimizing the overall performance of the magnetic device.

Embodiment

[0039] Referring to FIGS. 9 and 10, in this embodiment, the same reference numerals as those in the above-described embodiment are used. Based on the entire technical means of the above-described embodiment, the functional grooves 6 of this embodiment are arranged on the same side end plate 12, and the first external pin 32 is integrally connected to the metal terminal 3. The first external pin 32 engages with the side away from the magnetic cover 4 of the side end plate 12 and protrudes from the outer surface of the side end plate 12. The functional grooves 6 may be arranged between the first external pins 32, or the first external pins 32 may be arranged between the functional grooves 6. When specifically implemented, a functional pin 36 is integrally connected to one side of the metal terminal 3. The functional pin 36 of this embodiment is located in the first fitting groove 13, and the welding portion 31 is located on the functional pin 36 so as to form a terminal pad. The welding portion 31 and the winding lead 21 are positionally corresponding to the functional groove 6. That is, the winding lead 21 is electrically connected to the welding portion 31 through the functional groove 6. By the winding leads 21 and the functional grooves 6 that correspond to each other one by one, the winding leads 21 of each winding 2 respectively correspond to the functional grooves 6 at the same end portion, so that the extraction of the winding leads 21 through the functional grooves 6 is ensured, and a safety space can be provided for the winding leads 21. Based on the structural design in which the metal terminal 3 is located on the side away from the middle foot portion 11 of the side end plate 12, a sufficient physical separation space can be ensured between the connection point of the winding lead 21 and the metal terminal 3 and the winding 2, and when the winding lead 21 and the metal terminal 3 are welded and fixed, the risk of melting and damaging the winding 2 at high temperature can be avoided. By preventing the contamination of the winding 2 by foreign matters during welding, the structural reliability of the magnetic device can be improved. In the present embodiment, the groove depth of the functional groove 6 is larger than the wire diameter of the winding lead 21 so that the functional groove 6 can easily and better accommodate and guide the winding lead 21. In order to easily and better guide the winding lead 21, the groove shape of the functional groove 6 may be an arc shape, a triangle shape, a U shape, a trapezoid shape or a rectangle shape, and it is ensured that the winding lead 21 is accurately joined, and further mechanical stability can be provided, which helps to fix the winding lead 21 and reduce its vibration and displacement. Specifically, when implementing, the functional groove 6 may be connected and communicated with the first fitting groove 13, and the connection portion between the functional groove 6 and the first fitting groove 13 is chamfered, so as to prevent the winding lead 21 from receiving force at the corner of the functional groove 6 and the first fitting groove 13, and since the winding lead 21 is easily and smoothly connected to the welding portion 31 after being drawn out from the functional groove 6, the occurrence of winding damage can be prevented and the product reliability can be improved. The functional groove 6 may gradually expand toward the first fitting groove 13, or be a rectangular groove. Furthermore, a seventh auxiliary groove 77 may be further provided on the side away from the middle foot portion 11 of the side end plate 12, the seventh auxiliary groove 77 is respectively connected and communicated with the functional groove 6 and the first fitting groove 13, and the seventh auxiliary groove 77 gradually expands from the functional groove 6 toward the first fitting groove 13, that is, the seventh auxiliary groove 77 may be provided as a bellmouth structure, so that the winding lead 21 can be smoothly connected to the welding portion 31 after being drawn out from the functional groove 6, and by avoiding excessive hard contact with the groove wall of the functional groove 6, the quality of the winding lead 21 can be ensured. That is, the metal terminal 3 is connected to the side away from the middle foot portion 11 of the side end plate 12. A functional pin 36 is integrally connected to one side of the metal terminal 3. A welding portion 31 is provided on the functional pin 36. A functional groove 6 is provided on the side away from the magnetic cover 4 of the side end plate 12. The winding lead 21 is electrically connected to the welding portion 31 through the functional groove 6 in correspondence. By guiding the extraction of the winding lead 21 through the functional groove 6, providing a safety space for the winding lead 21, and ensuring that there is a sufficient physical separation space between the connection point of the winding lead 21 and the metal terminal 3 and the winding 2, the structural reliability of the magnetic device is improved and the overall performance of the magnetic device is optimized.

Embodiment

[0040] Referring to FIGS. 9 and 10, in this embodiment, the same reference numerals as those in the above-described embodiment are used. Based on the entire technical means of the above-described embodiment, a functional pin 36 is provided on one side of the metal terminal 3 of this embodiment. The welding portion 31 is located on the functional pin 36. A constriction portion 37 is provided between the functional pin 36 and the metal terminal 3. Both ends of the constriction portion 37 are integrally connected to the functional pin 36 and the metal terminal 3 respectively. The structural width of the constriction portion 37 is the second set multiple of the structural width of the functional pin 36. Specifically, when implementing, the constriction portion 37 of this embodiment, as a link between the functional pin 36 and the metal terminal 3, that is, when the welding portion 31 of the functional pin 36 and the winding lead 21 are welded, the structural design of the constriction portion 37 reduces the transmission of heat generated by welding to the metal terminal 3. Furthermore, assuming the structural width of the functional pin 36 is J and the structural width of the constriction portion 37 is K, then K = the second set multiple of J. The numerical range of the second set multiple of this embodiment may include 0.2 to 0.9 times, that is, the structural width of the constriction portion 37 is 0.2 to 0.9 times the structural width of the functional pin 36. Preferably, the structural width of the constriction portion 37 is 0.2 times, 0.4 times, 0.6 times, 0.7 times, or 0.9 times the structural width of the functional pin 36. Assuming the side of the constriction portion 37 is E, the two sides E of the constriction portion 37 may be reduced facing each other in the structural form, or one side E of the constriction portion 37 may be reduced towards the opposite side E. Preferably, by providing the cross-sectional contour of the side E in an arc shape, the connection between the functional pin 36 and the metal terminal 3 is made through a narrow bridge structure, reducing the transfer of heat from the welding of the welding part 31 to the metal terminal 3. It should be understood that the structural width of the constricted portion 37 in this embodiment is much smaller than the structural width of the functional pin 36, and the contour line of the side E may be a regular straight line, and the description thereof is omitted here. On the other hand, a functional pin 36 is provided on one side of the metal terminal 3 in this embodiment. One end of the functional pin 36 has a chamfered portion 38, the welding part 31 is located at the chamfered portion 38, and the welding part 31 is inclined toward the functional groove 6. In this way, the chamfered portion 38 is laid on the functional pin 36 toward the functional groove 6, and the extending direction in which the winding lead 21 is electrically connected to the welding part 31 after passing through the functional groove 6 and the side of the chamfered portion 38 facing the functional groove 6 have a set value angle. Preferably, the numerical range of the set value angle includes 60° to 90°. Specifically, the specific numerical value of the set value may be 60°, 70°, 80°, or 90°. When the set value angle is 90°, the extending direction in which the winding lead 21 in this embodiment is electrically connected to the welding part 31 after passing through the functional groove 6 and the side of the chamfered portion 38 facing the functional groove 6 are perpendicular to each other. Assuming the extending direction in which the winding lead 21 is electrically connected to the welding part 31 after passing through the functional groove 6 is C, and the side of the chamfered portion 38 facing the functional groove 6 is D, then C and D have a set value angle. That is, due to the action of the chamfered portion 38, the extending direction in which the winding lead 21 is electrically connected to the welding part 31 after passing through the functional groove 6 and the side of the chamfered portion 38 facing the functional groove 6 have a set value angle, preventing the winding lead 21 from deviating from the welding position, and further enabling the winding lead 21 to be easily electrically connected to the welding part 31, ensuring a strong connection between the winding lead 21 and the welding part 31, and improving the product reliability.

[0041] As described in detail above with respect to the present application, in this specification, the principles and embodiments of the present application are described using specific examples. However, the description of the above examples is merely for understanding the core idea of the present application. On the other hand, those skilled in the art may make changes to the specific embodiments and the scope of application based on the concept of the present application. In summary, the content of this specification should not be construed as limiting the present application.

Description of Reference Numerals

[0042] 1 Core 11 Middle Foot 12 Side End Plate 13 First Fitting Groove 14 Second Fitting Groove 15 Third Fitting Groove 16 Function Table 17 Second External Pin 2 Coil 21 Coil Lead 3 Metal Terminal 31 Welding Portion 32 First External Pin 33 Connection Pin 34 Bent Pin 35 Fitting Through Hole 36 Function Pin 37 Necking Portion 38 Chamfered Portion 4 Magnetic Cover 5 Adhesive Layer 50 Adhesive Body Portion 51 First Adhesive Portion 52 Second Adhesive Portion 53 Third Adhesive Portion 54 Fourth Adhesive Portion 6 Function Groove 71 First Auxiliary Groove 72 Second Auxiliary Groove 73 Third Auxiliary Groove 74 Fourth Auxiliary Groove 75 Fifth Auxiliary Groove 76 Sixth Auxiliary Groove 77 Seventh Auxiliary Groove 8 Side Panel

Claims

1. A magnetic core including a center foot and side end plates connected to both ends of the center foot, the side end plates being provided with functional grooves; a winding wound around the center leg portion according to a predetermined rule, each of the windings having a winding lead at both ends; metal terminals arranged opposite to each other and connected to the side of the side plate away from the center foot portion at a predetermined interval, the winding lead being electrically connected to a welded portion of the metal terminal through the functional groove; a magnetic cover connected to the magnetic core to form a closed magnetic circuit with the magnetic core; an adhesive layer provided between the side end plate, the metal terminal and the magnetic cover for adhesively fixing the magnetic cover and the metal terminal to the magnetic core, respectively.

2. 2. The magnetic device according to claim 1, wherein a first fitting groove is provided in the side end plate, the metal terminal is fitted into the first fitting groove via the adhesive layer, and the groove depth of the first fitting groove is equal to or greater than a first set multiple of the thickness of the metal terminal.

3. 2. The magnetic device according to claim 1, wherein the functional grooves are located on the side of the side end plate away from the magnetic cover and between adjacent metal terminals.

4. The magnetic device described in claim 2, characterized in that a connection pin facing the side end plate is provided on one side of the metal terminal, and a second mating groove connected to and communicating with the first mating groove is provided on both sides of the side end plate, and the connection pin is fixed in the second mating groove via the adhesive layer.

5. 2. The magnetic device of claim 1, wherein a first external pin is integrally connected to the metal terminal, the first external pin engages with the side of the side end plate away from the magnetic cover, and protrudes from the outer surface of the side end plate.

6. The magnetic device described in claim 5, characterized in that if A is the shortest distance from the side of the welded portion of the metal terminal closer to the first external pin to the side of the first external pin away from the welded portion of the metal terminal, and B is the width of the first external pin, then 0.1B≦A≦B or B<A≦B+1.5 mm.

7. 2. The magnetic device of claim 1, further comprising a first auxiliary groove on both sides of the side end plate, a second auxiliary groove on a side edge of the magnetic cover at a location corresponding to the first auxiliary groove, the first auxiliary groove being connected to and communicating with the second auxiliary groove, and the adhesive layer being filled into the first auxiliary groove and the second auxiliary groove.

8. 2. The magnetic device of claim 1, wherein a third auxiliary groove is provided on the side of the side end plate closer to the magnetic cover, the third auxiliary groove being located between adjacent metal terminals, a fourth auxiliary groove is provided on the magnetic cover at a location corresponding to the third auxiliary groove, the third auxiliary groove is connected to and communicates with the fourth auxiliary groove, and the adhesive layer is filled into the third auxiliary groove and the fourth auxiliary groove.

9. 3. The magnetic device of claim 2, wherein the functional grooves are arranged on both sides of the side end plate, a fifth auxiliary groove is provided at an end of the magnetic cover corresponding to the metal terminal, a sixth auxiliary groove is provided on the side end plate, the first fitting groove and the fifth auxiliary groove are connected and communicated via the sixth auxiliary groove, and the adhesive layer is filled into the fifth auxiliary groove and the sixth auxiliary groove.

10. 3. The magnetic device according to claim 2, wherein a third mating groove is provided in the first mating groove, and a bent pin is integrally connected to the metal terminal and is inserted into the third mating groove and fixed to the third mating groove via the adhesive layer.

11. 11. The magnetic device according to claim 10, wherein the metal terminal has a mating through hole connected to the bent pin or spaced a predetermined distance therefrom, and the adhesive layer extends into the mating through hole.

12. 2. The magnetic device according to claim 1, wherein the functional grooves are arranged on the side edges of the side end plates and have functional inclined surfaces, a functional pin is integrally connected to one side of the metal terminal, the welded portion is located on the functional pin, and the functional pin is in close contact with the functional inclined surface.

13. 13. The magnetic device according to claim 12, wherein the functional slope is inclined toward the midfoot portion and has a predetermined slope angle with respect to the first direction, and the winding leads correspond one-to-one with the functional pins and are electrically connected to the welds at the functional pins via the functional slope.

14. The magnetic device of claim 13, characterized in that a functional table is integrally connected to the side of the side end plate away from the magnetic cover, the functional table protruding from the functional slope, a second external pin is connected to one side of the metal terminal, and the second external pin engages with the functional table and protrudes from the outer surface of the side end plate.

15. The magnetic device according to claim 14, characterized in that the second external pins arranged symmetrically on the same side end plate are positioned between the functional slopes arranged symmetrically, with a predetermined distance between the second external pins arranged symmetrically.

16. 3. The magnetic device according to claim 2, wherein a functional pin located in the first fitting groove is integrally connected to one side of the metal terminal, the welded portion is located on the functional pin, and the welded portion and the winding lead are in positional correspondence with the functional groove.

17. 17. The magnetic device according to claim 16, wherein the functional groove is connected to and communicates with the first fitting groove, and a connecting portion between the functional groove and the first fitting groove is chamfered.

18. 2. The magnetic device of claim 1, wherein a functional pin is provided on one side of the metal terminal, the welded portion is located on the functional pin, a constricted portion is provided between the functional pin and the metal terminal, both ends of the constricted portion are integrally connected to the functional pin and the metal terminal, respectively, and a structural width of the constricted portion is a second set multiple of a structural width of the functional pin.

19. 2. The magnetic device according to claim 1, characterized in that a functional pin having a chamfered portion at one end is provided on one side of the metal terminal, the welding portion is located on the chamfered portion, and an angle between an extension direction in which the winding lead passes through the functional groove and is electrically connected to the welding portion and a side edge of the chamfered portion facing the functional groove forms a set value.

20. The magnetic device of any one of claims 1 to 19, characterized in that the midfoot portion and the side end plate are integrally connected to form an E-shaped structure or a drum-shaped structure, the portion of the side end plate protruding from the midfoot portion forms a side panel, and the height of the side panel relative to the midfoot portion is greater than the height of the winding relative to the midfoot portion.

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