Magnetic core inductor, manufacturing method of magnetic core inductor and electronic device
By setting a hollowed-out groove on the side wall of the magnetic core base plate and bending the coil lead part, the problems of reduced mechanical strength and low magnet space utilization caused by the existing magnetic core inductor lead storage method are solved, and the manufacturing of high-strength magnetic core inductors with excellent impact resistance is realized.
Patent Information
- Application Number
- CN202511799101.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-02
- Publication Date
- 2026-03-03
AI Technical Summary
The existing method of storing the lead wires of magnetic core inductors involves creating grooves on the bottom blades, which leads to a decrease in mechanical strength, a reduction in the utilization of magnet space, and the problem that protruding leads can easily cause brittle fracture of the magnetic core.
A hollowed-out groove is set on the side wall of the magnetic core base plate, and the coil lead is bent into the hollowed-out groove and fixed by the package body, which avoids opening a groove at the bottom, improving mechanical strength and magnet space utilization.
This improves the mechanical strength and shock resistance of the magnetic core inductor, reduces the risk of breakage, enhances the utilization of magnet space, ensures pin position consistency, and improves production yield and product reliability.
Smart Images
Figure CN121601401A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of inductor technology, and in particular to a magnetic core inductor, a method for manufacturing a magnetic core inductor, and an electronic device thereof. Background Technology
[0002] Power inductors, as core passive components of power electronic systems, are widely used in voltage conversion, energy storage, and noise filtering. Their performance directly affects the efficiency, size, and reliability of the entire circuit. In current power inductor manufacturing, trapezoidal (T-CORE) or I-CORE core structures are commonly used. In these structures, the coil leads or soldered metal terminals of the wound core need to be properly concealed to prevent them from protruding and affecting the inductor's final installation and performance.
[0003] Currently, the common lead wire storage method used in the industry involves pressing a groove into the bottom surface of the bottom blade of the T-CORE or I-CORE during manufacturing. The lead wire is then bent and wound around the bottom surface of the T-CORE or I-CORE bottom blade and fixed in the groove. However, this storage method has certain drawbacks.
[0004] First, creating grooves on the bottom blades significantly weakens their mechanical strength, making them prone to cracking during core pressing or sintering, and susceptible to breakage under stress in subsequent processes. Second, grooves on the bottom blades encroach on the magnet space that could be used to construct a complete magnetic circuit, reducing the effective volume utilization of the magnet and thus limiting the inductor's electromagnetic performance. Furthermore, the leads, being concealed at the bottom, tend to protrude from the bottom surface of the blades. Since the bending shape and protrusion height of the leads are difficult to control, this can lead to inconsistent product heights. Under mechanical impact, the protruding leads may directly transfer stress to the core body, causing brittle fracture of the core. Summary of the Invention
[0005] The purpose of this invention is to provide a magnetic core inductor, a method for manufacturing a magnetic core inductor, and an electronic device thereof. The magnetic core inductor has high mechanical strength, improves its impact resistance, making it less prone to breakage, and also improves the utilization rate of the magnet space and enhances the electromagnetic performance of the magnetic inductor.
[0006] To achieve this objective, the present invention adopts the following technical solution:
[0007] On the one hand, a magnetic core inductor is provided, comprising:
[0008] A magnetic core base plate, wherein the magnetic core base plate is provided with a mounting surface, and a first hollow groove and a second hollow groove are provided on the side wall of the magnetic core base plate;
[0009] A coil is disposed on the mounting surface. A first pin is provided at a first end of the coil, and a second pin is provided at a second end of the coil. The first pin is bent toward the mounting surface into a first hollow groove with the end of the first pin facing the side wall of the first hollow groove. The second pin is bent toward the mounting surface into a second hollow groove with the end of the second pin facing the side wall of the second hollow groove.
[0010] An encapsulation body is provided, which covers the outside of the coil and fixes the coil to the magnetic core base plate.
[0011] In some possible implementations, the first and second cutouts are located on opposite sides of the coil.
[0012] In some possible implementations, along the extending direction of the mounting surface, the cross-sectional area of the first hollow groove is greater than the cross-sectional area of the first pin portion, and the cross-sectional area of the second hollow groove is greater than the cross-sectional area of the second pin portion.
[0013] In some possible implementations, along the extension direction of the mounting surface, the sum of the cross-sectional areas of the first hollow groove and the second hollow groove is less than half the cross-sectional area of the magnetic core base plate.
[0014] In some possible implementations, the side of the first pin portion facing away from the mounting surface and the side of the second pin portion facing away from the mounting surface are both flush with or lower than the surface of the magnetic core base plate facing away from the mounting surface.
[0015] In some possible implementations, the magnetic core inductor further includes a magnetic core post disposed on the mounting surface and connected to the magnetic core base plate, and the coil is sleeved on the magnetic core post.
[0016] On the other hand, a method for manufacturing a magnetic core inductor is provided, which is applied to the aforementioned magnetic core inductor, and specifically includes the following steps:
[0017] S1: The coil is placed on the mounting surface, and the first pin portion corresponds to the first hollow slot, and the second pin portion corresponds to the second hollow slot;
[0018] S2: Bend the first pin into the first hollow groove and make the end of the first pin face the side wall of the first hollow groove; bend the second pin into the second hollow groove and make the end of the second pin face the side wall of the second hollow groove.
[0019] S3: The coil is encapsulated on the magnetic core base plate by the encapsulation body, and the side of the first pin portion and the second pin portion facing away from the mounting surface is exposed outside the encapsulation body.
[0020] In some possible implementations, in step S2, the first pin portion is bent into a stacked shape at least once within the first hollow groove; the second pin portion is bent into a stacked shape at least once within the second hollow groove.
[0021] In some possible implementations, the package is soft magnetic powder, and the package is coated onto the coil and part of the magnetic core base plate by a molding process. The package fills the first hollow groove and the second hollow groove and fixes the first pin portion and the second pin portion.
[0022] On the other hand, an electronic device is provided, including a circuit board and the aforementioned magnetic core inductor, wherein the magnetic core inductor is mounted on the circuit board, and both the first pin portion and the second pin portion are electrically connected to the circuit board.
[0023] The beneficial effects of this invention are:
[0024] This invention provides a magnetic core inductor, a method for manufacturing a magnetic core inductor, and an electronic device. The magnetic core inductor includes a magnetic core base plate, a coil, and a package. The magnetic core base plate has a mounting surface, and a first and a second perforated groove are provided on its side wall. The coil is disposed on the mounting surface, with a first lead at one end and a second lead at the other end. The first lead is bent toward the mounting surface into the first perforated groove, with its end facing the side wall of the first perforated groove. The second lead is bent toward the mounting surface into the second perforated groove, with its end facing the side wall of the second perforated groove. The package covers the coil and fixes it to the magnetic core base plate. The first and second perforated grooves on the side wall of the magnetic core base plate eliminate the need for a groove at the bottom of the base plate, ensuring the integrity of the bottom structure of the base plate. This significantly improves the mechanical strength and shock resistance of the base plate, reducing the risk of stress-induced breakage during production and use. Furthermore, when subjected to mechanical impact, the first and second pins experience less impact, with most of the stress transferred to the core base plate. A smaller amount of stress is directly transferred to the package, preventing brittle fracture of the package and reducing the risk of short circuits and poor contact during assembly. Moreover, the absence of grooves on the bottom of the core base plate, which encroach on the magnetic space of the complete magnetic circuit, improves the effective volume utilization of the core base plate. This allows for more substantial use of magnetic material, significantly enhancing the saturation current and other characteristics of the core inductor within the same product size. This enables further miniaturization of the overall core inductor size, making it suitable for more highly integrated applications. Additionally, the first and second cutouts accurately define the positions of the first and second pins, ensuring consistent shapes for each core inductor's first and second pins, thus improving production yield and product reliability. Attached Figure Description
[0025] Figure 1 This is a schematic diagram of the structure of the magnetic core inductor provided in an embodiment of the present invention;
[0026] Figure 2 This is a schematic diagram of the structure of the magnetic core base plate and coil involved in the embodiments of the present invention;
[0027] Figure 3 This is a schematic diagram of the structure of the magnetic core base plate and magnetic core column provided in the embodiment of the present invention.
[0028] In the picture:
[0029] 1. Magnetic core base plate; 11. Mounting surface; 12. First hollow slot; 13. Second hollow slot; 2. Coil; 21. First pin portion; 22. Second pin portion; 3. Package body; 4. Magnetic core post. Detailed Implementation
[0030] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.
[0031] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.
[0032] In the description of this invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0033] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.
[0034] Example 1:
[0035] like Figures 1 to 3 As shown, this embodiment provides a magnetic core inductor. The magnetic core inductor includes a magnetic core base plate 1, a coil 2, and a package 3. The magnetic core base plate 1 is provided with a mounting surface 11, and a first slot 12 and a second slot 13 are provided on the side wall of the magnetic core base plate 1. The coil 2 is disposed on the mounting surface 11. A first lead portion 21 is provided at the first end of the coil 2, and a second lead portion 22 is provided at the second end of the coil 2. The first lead portion 21 is bent toward the side facing the mounting surface 11 into the first slot 12, with the end of the first lead portion 21 facing the side wall of the first slot 12. The second lead portion 22 is bent toward the side facing the mounting surface 11 into the second slot 13, with the end of the second lead portion 22 facing the side wall of the second slot 13. The package 3 covers the outside of the coil 2 and fixes the coil 2 to the magnetic core base plate 1.
[0036] In this embodiment, the magnetic core inductor has a first hollowed-out groove 12 and a second hollowed-out groove 13 on the side wall of the magnetic core base plate 1. This eliminates the need for a groove at the bottom of the magnetic core base plate 1, ensuring the integrity of the bottom structure and significantly improving its mechanical strength and resistance to mechanical impact. This reduces the risk of stress-induced breakage during production and use. Furthermore, when subjected to mechanical impact, the first lead portion 21 and the second lead portion 22 experience less impact, with most stress transferred to the magnetic core base plate 1 and a smaller amount directly transferred to the package 3, preventing brittle fracture of the package 3. This also reduces the risk of short circuits and poor contact during assembly. Moreover, the absence of a groove at the bottom of the magnetic core base plate 1 encroaches on the magnetic space of the complete magnetic circuit, improving the effective volume utilization of the magnetic core base plate 1. This allows for a more substantial use of the magnetic material, significantly improving the saturation current and other characteristics of the magnetic core inductor within the same product size. This enables further miniaturization of the overall size of the magnetic core inductor, making it suitable for more highly integrated applications. In addition, the first slot 12 and the second slot 13 can accurately limit the position of the first pin portion 21 and the second pin portion 22, ensuring that the shape of the first pin portion 21 and the second pin portion 22 of each magnetic core inductor is consistent, thereby improving production yield and product reliability.
[0037] Specifically, the magnetic core base plate 1 has a cuboid structure. The side of the magnetic core base plate 1 facing away from the mounting surface 11 is the bottom. The magnetic core base plate 1 is formed by pressing and molding soft magnetic metal powder to create the first hollow groove 12 and the second hollow groove 13, which simplifies the manufacturing process of the magnetic core base plate 1 and reduces manufacturing costs. The main body of the coil 2 is wound and placed at the center of the magnetic core base plate 1. The first lead portion 21 and the second lead portion 22 are located on both sides of the main body and extend in the same direction.
[0038] Optionally, the core base plate 1 can be made of alloy, amorphous, nanocrystalline, high-entropy alloy, or ferrite. Alloys, amorphous, nanocrystalline, high-entropy alloys, and ferrites have good structural strength or magnetic permeability. Different materials can be selected according to different operating frequencies and power levels. In other embodiments, the core base plate 1 can also be made of other soft magnetic materials, not limited to this embodiment.
[0039] Optionally, along the extension direction of the mounting surface 11, the cross-section of the first hollow groove 12 and the cross-section of the second hollow groove 13 are square, rhomboid, circular or elliptical. Their structure is simple, which is convenient for processing the magnetic core base plate 1 and ensures that the magnetic core base plate 1 has a certain structural strength. It is also convenient to place the first pin portion 21 and the second pin portion 22.
[0040] Specifically, along the thickness direction of the magnetic core base plate 1, the first hollow groove 12 and the second hollow groove 13 are through grooves. The edges of the first hollow groove 12 and the second hollow groove 13 are provided with rounded corners or chamfers to reduce stress concentration. In other embodiments, the cross-sections of the first hollow groove 12 and the second hollow groove 13 may also be other shapes, not limited to this embodiment.
[0041] Example 2:
[0042] Based on Embodiment 1, optionally, the first hollowed-out groove 12 and the second hollowed-out groove 13 are located on both sides of the coil 2 to ensure the mechanical balance of the magnetic core base plate 1 and the coil 2 in terms of structure, and to prevent uneven stress caused by housing the first pin portion 21 and the second pin portion 22 on one side of the coil 2. Specifically, the first hollowed-out groove 12 and the second hollowed-out groove 13 are located at two adjacent apex corners of the magnetic core base plate 1 and are arranged opposite to each other, so that the magnetic core base plate 1 is convex. In other embodiments, the first hollowed-out groove 12 and the second hollowed-out groove 13 can also be arranged symmetrically about the center of the magnetic core base plate 1.
[0043] Furthermore, along the extension direction of the mounting surface 11, the cross-sectional area of the first hollow groove 12 is larger than the cross-sectional area of the first pin portion 21, and the cross-sectional area of the second hollow groove 13 is larger than the cross-sectional area of the second pin portion 22, so that the first pin portion 21 is completely housed in the first hollow groove 12, and the second pin portion 22 is completely housed in the second hollow groove 13, so that the edges of the first pin portion 21 and the second pin portion 22 do not protrude from the magnetic core base plate 1, reducing the overall space occupied by the magnetic core inductor and facilitating the encapsulation of the package 3.
[0044] Furthermore, along the extending direction of the mounting surface 11, the sum of the cross-sectional areas of the first hollow groove 12 and the second hollow groove 13 is less than half the cross-sectional area of the magnetic core base plate 1, ensuring the structural strength of the magnetic core base plate 1. The specific dimensions of the first hollow groove 12 and the second hollow groove 13 can be precisely designed according to specific circumstances to match the wire diameter of the first pin portion 21 and the second pin portion 22.
[0045] Example 3:
[0046] Based on Embodiment 2, optionally, the side of the first pin portion 21 facing away from the mounting surface 11 and the side of the second pin portion 22 facing away from the mounting surface 11 are both flush with the side of the magnetic core base plate 1 facing away from the mounting surface 11 or located within the first cutout groove 12 and the second cutout groove 13, respectively. This prevents the first pin portion 21 and the second pin portion 22 from protruding from the bottom of the magnetic core base plate 1, thus avoiding stress being directly transmitted to the package body 3 through the first pin portion 21 and the second pin portion 22, and improving the shock resistance of the magnetic core inductor. Specifically, the thickness of the magnetic core base plate 1 is set according to specific circumstances to be sufficient to accommodate the first pin portion 21 and the second pin portion 22.
[0047] Example 4:
[0048] Based on Embodiment 1, optionally, the magnetic core inductor further includes a magnetic core post 4, which is disposed on the mounting surface 11 and connected to the magnetic core base plate 1. The coil 2 is sleeved on the magnetic core post 4. By providing the magnetic core post 4, it is easier to fix the coil 2 and improve the stability during the assembly of the magnetic core inductor. Specifically, the magnetic core post 4 has a cylindrical structure. The axis of the magnetic core post 4 extends along the thickness direction of the magnetic core base plate 1. The magnetic core post 4 is fixed at the center position of the magnetic core base plate 1.
[0049] The magnetic core inductor of this embodiment is named INT-CORE. This magnetic core inductor can be applied to various electronic component products where terminals or coils are assembled with magnetic cores. The magnetic core inductor of this embodiment can increase the cross-sectional area of the effective magnetic circuit, with the increase ranging from 5% to 15%.
[0050] Example 5:
[0051] This embodiment provides a method for manufacturing a magnetic core inductor. This method is used to manufacture the magnetic core inductors described in Embodiments 1 to 4 above, and specifically includes the following steps:
[0052] S1: Place the coil 2 on the mounting surface 11, and make the first pin portion 21 correspond to the first hollow groove 12, and the second pin portion 22 correspond to the second hollow groove 13;
[0053] S2: Bend the first pin portion 21 into the first hollow groove 12 and make the end of the first pin portion 21 face the side wall of the first hollow groove 12; bend the second pin portion 22 into the second hollow groove 13 and make the end of the second pin portion 22 face the side wall of the second hollow groove 13.
[0054] S3: The coil 2 is encapsulated on the magnetic core base plate 1 by the encapsulation body 3, and the side of the first pin portion 21 and the second pin portion 22 facing away from the mounting surface 11 is exposed outside the encapsulation body 3.
[0055] The magnetic core inductor manufactured using this method houses the entire first lead portion 21 within the first slot 12 and the entire second lead portion 22 within the second slot 13. This eliminates the need for grooves on the bottom of the magnetic core base plate 1, ensuring the integrity of the bottom structure and significantly improving its mechanical strength and shock resistance. This reduces the risk of stress-induced breakage during production and use. Furthermore, the absence of grooves on the bottom of the magnetic core base plate 1, which encroach on the magnetic space of the complete magnetic circuit, improves the effective volume utilization of the base plate 1. This allows for a more substantial use of magnetic material, enhancing the consistency of each magnetic core inductor and improving production yield and product reliability.
[0056] Specifically, in step S1, the coil 2 is fitted onto the magnetic core post 4, and the coil 2 is rotated to adjust it to a suitable angle so that the first pin 21 corresponds to the first slot 12 and the second pin 22 corresponds to the second slot 13. In step S2, the first pin 21 is bent and fitted against the side wall of the first slot 12 to fully utilize the space of the first slot 12; the second pin 22 is bent and fitted against the side wall of the second slot 13 to fully utilize the space of the second slot 13 and ensure the accuracy of the installation position. At the same time, the bending positions of the first pin 21 and the second pin 22 are controlled to ensure that the edges of the bent first pin 21 and the second pin 22 do not protrude from the side and bottom of the magnetic core base plate 1. Soft magnetic powder is filled into the first hollow groove 12, the second hollow groove 13, and the mounting surface 11. The soft magnetic powder is then pressed to form a package 3, which covers the coil 2 and fixes the first lead portion 21 and the second lead portion 22. The pressed magnetic core inductor has an overall cubic structure. Optionally, in step S2, the first lead portion 21 is bent into a stacked shape at least once within the first hollow groove 12; the second lead portion 22 is bent into a stacked shape at least once within the second hollow groove 13. The space of the first hollow groove 12 and the second hollow groove 13 is fully utilized to ensure that the first lead portion 21 and the second lead portion 22 can be completely accommodated. Specifically, both the first lead portion 21 and the second lead portion 22 are repeatedly bent towards the bottom of the magnetic core base plate 1 to form a stacked shape.
[0057] Optionally, in step S3, the package 3 is made of soft magnetic powder. The package 3 is coated onto the coil 2 and part of the magnetic core base plate 1 through a molding process. The package 3 fills the first hollow groove 12 and the second hollow groove 13 and fixes the first pin portion 21 and the second pin portion 22. The package 3, coated onto the coil 2 and part of the magnetic core base plate 1 through a molding process, can protect the coil 2 and the magnetic core base plate 1 and form a magnetic circuit. At the same time, it can fix the first pin portion 21 and the second pin portion 22. Through one-step molding, multiple objectives such as packaging, fixing the first pin portion 21 and the second pin portion 22, and constructing a magnetic circuit are achieved simultaneously. The process is simple, consistent, and suitable for automated mass production.
[0058] Specifically, the soft magnetic powder can be one or more of ferrite powder, amorphous powder, nanocrystalline powder, high-entropy alloy powder, permalloy powder, or ferrosilicon powder. As a functional phase, the soft magnetic powder provides magnetic permeability and undertakes magnetic flux conduction. The soft magnetic powder is mixed with an insulating binder to form a soft magnetic composite, wherein the insulating binder is epoxy resin, phenolic resin, polyimide, or silicone resin. To improve the filling rate of the soft magnetic powder in the binder and reduce eddy current losses, the surface of the soft magnetic powder is insulatingly treated to form a thin and dense phosphate insulating layer or silicon dioxide insulating layer on its surface. Furthermore, the volume percentage of the soft magnetic powder in the soft magnetic composite is between 40% and 80%, so that the soft magnetic powder has good magnetic properties and is easy to mold.
[0059] The preparation process of the package 3 includes ingredient mixing, molding, and curing. First, the package 3 is mixed by weighing the surface-insulating soft magnetic powder and insulating binder according to the volume ratio of the soft magnetic powder mentioned above, and adding appropriate amounts of solvent (such as acetone, butanone) and coupling agent (such as silane coupling agent). This mixture is then thoroughly mixed in a mixer to form a uniform paste or lumpy composite material. Next, the mixed composite material is molded by placing it into a mold pre-filled with the magnetic core base plate 1, coil 2, and magnetic core column 4. Molding is performed using a hydraulic press or punch press. The molding pressure is preferably controlled between 50 MPa and 200 MPa. This pressure range is sufficient to ensure sufficient material flow and complete filling of the internal gaps of the coil 2 and the first and second hollowed-out grooves 12 and 13 of the magnetic core base plate 1, while ensuring sufficient density of the package 3. Finally, a curing process is performed by placing the molded semi-finished product in an oven for heat curing. The curing temperature depends on the material of the insulating adhesive, preferably ranging from 100°C to 180°C. In this embodiment, the insulating adhesive is epoxy resin, cured at 150°C for 1-2 hours. The curing process causes a cross-linking reaction in the adhesive, shaping the encapsulated body 3 and achieving its final mechanical strength and hardness. Example Six:
[0060] This embodiment provides an electronic device, including a circuit board and the magnetic core inductor described in embodiments one through four above. The magnetic core inductor is mounted on the circuit board, and the first lead portion 21 and the second lead portion 22 are electrically connected to the circuit board. Specifically, the side of the magnetic core base plate 1 facing away from the mounting surface 11 is attached to the circuit board. The circuit board is provided with pads, and both the first lead portion 21 and the second lead portion 22 are soldered to the pads. In this embodiment, the bottom structure of the magnetic core base plate 1 has good integrity, allowing the bottom of the magnetic core base plate 1 to better fit against the circuit board, facilitating its installation and providing installation stability. Furthermore, it significantly improves the mechanical strength and resistance to mechanical shock of the magnetic core base plate 1, reducing the risk of the magnetic core inductor breaking due to stress during use, thereby increasing the service life of the electronic device.
[0061] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.
Claims
1. A magnetic core inductor, characterized in that, include: A magnetic core base plate, wherein the magnetic core base plate is provided with a mounting surface, and a first hollow groove and a second hollow groove are provided on the side wall of the magnetic core base plate; A coil is disposed on the mounting surface. A first pin is provided at a first end of the coil, and a second pin is provided at a second end of the coil. The first pin is bent toward the mounting surface into a first hollow groove with the end of the first pin facing the side wall of the first hollow groove. The second pin is bent toward the mounting surface into a second hollow groove with the end of the second pin facing the side wall of the second hollow groove. A package body that covers the outside of the coil and fixes the coil to the magnetic core base plate.
2. The magnetic core inductor according to claim 1, characterized in that, The first and second hollowed-out slots are located on both sides of the coil, respectively.
3. The magnetic core inductor according to claim 1, characterized in that, Along the extending direction of the mounting surface, the cross-sectional area of the first hollow groove is greater than the cross-sectional area of the first pin portion, and the cross-sectional area of the second hollow groove is greater than the cross-sectional area of the second pin portion.
4. The magnetic core inductor according to claim 3, characterized in that, Along the extending direction of the mounting surface, the sum of the cross-sectional area of the first hollow groove and the cross-sectional area of the second hollow groove is less than half of the cross-sectional area of the magnetic core base plate.
5. The magnetic core inductor according to claim 3, characterized in that, The side of the first pin portion facing away from the mounting surface and the side of the second pin portion facing away from the mounting surface are both flush with or lower than the side of the magnetic core base plate facing away from the mounting surface.
6. The magnetic core inductor according to claim 1, characterized in that, The magnetic core inductor also includes a magnetic core post, which is disposed on the mounting surface and connected to the magnetic core base plate, and the coil is sleeved on the magnetic core post.
7. A method for manufacturing a magnetic core inductor, characterized in that, The application to the magnetic core inductor as described in any one of claims 1-6 specifically includes the following steps: S1: The coil is placed on the mounting surface, and the first pin portion corresponds to the first hollow slot, and the second pin portion corresponds to the second hollow slot; S2: Bend the first pin into the first hollow groove and make the end of the first pin face the side wall of the first hollow groove; bend the second pin into the second hollow groove and make the end of the second pin face the side wall of the second hollow groove. S3: The coil is encapsulated on the magnetic core base plate by the encapsulation body, and the side of the first pin portion and the second pin portion facing away from the mounting surface is exposed outside the encapsulation body.
8. The method for manufacturing a magnetic core inductor according to claim 7, characterized in that, In step S2, the first pin portion is bent into a stacked shape at least once within the first hollow groove; the second pin portion is bent into a stacked shape at least once within the second hollow groove.
9. The method for manufacturing a magnetic core inductor according to claim 7, characterized in that, In step S3, the package is soft magnetic powder. The package is coated onto the coil and part of the magnetic core base plate by molding process. The package fills the first hollow groove and the second hollow groove and fixes the first pin part and the second pin part.
10. An electronic device, characterized in that, The device includes a circuit board and a magnetic core inductor as described in any one of claims 1-7, wherein the magnetic core inductor is mounted on the circuit board and both the first pin portion and the second pin portion are electrically connected to the circuit board.