Magnetic core, inductance element and product

Abstract

The invention provides a magnetic core, an inductance element and a product, the magnetic core is provided with a first blade, a second blade and a middle column, the junction of the first blade and the middle column and the junction of the second blade and the middle column are provided with fillets, and the radius of the fillets is R; in the axial direction of the middle column, a gap with the height E is formed between the first blade and the second blade; the thickness of the first blade is D1, and the first blade has a first extension length L1 relative to the middle column in the length of the first blade; the thickness of the second blade is D2, and the second blade has a second extension length L2 relative to the middle column in the length of the second blade; if the # imgabs 0 # and the # imgabs 1 #, the radius R meets the following relational expression: # imgabs 2 #; if the # imgabs is 3 # and the # imgabs is 4 #, the radius R meets the following relational expression: # imgabs 5 #; if the # imgabs is 6 # and the # imgabs is 7 #, the radius R meets the following relational expression: # imgabs 8 #; if # imgabs9 #, the radius R meets the following relational expression: # imgabs10 #; and if the # imgabs is 11 #, the radius R meets the following relational expression: # imgabs 12 #. The product is provided with an inductance element, the inductance element is provided with the magnetic core, and the magnetic core is high in mechanical shock resistance, high in cold and hot shock resistance and high in reliability.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic components, and in particular to a magnetic core, an inductor element provided with the magnetic core, and a product provided with the inductor element. Background Art

[0002] In the existing production process of magnetic glue inductors, after winding on the I-shaped magnetic core, it is necessary to fill the gap of the I-shaped magnetic core with magnetic epoxy glue and cover the winding with the magnetic epoxy glue. The magnetic epoxy glue plays a structural support role, improves the magnetic properties of the magnetic glue inductor, enhances the heat dissipation performance of the magnetic glue inductor, and improves the moisture-proof and chemical protection capabilities of the magnetic glue inductor. The I-shaped magnetic core has a first blade, a second blade and a middle column, and the middle column is connected between the first blade and the second blade, wherein the junction between the first blade and the middle column and the junction between the second blade and the middle column are almost right-angled. Since the existing I-shaped magnetic core is supported by brittle material ferrite, the expansion coefficients of the ferrite material and the magnetic epoxy glue are greatly different, and there is a certain shrinkage rate in the curing process of the magnetic epoxy glue, the thermal stress generated after heat treatment is easy to exceed the tolerance limit of the ferrite, resulting in cracks at the junction of the blade and the middle column. Summary of the invention

[0003] In order to solve the above problems, the main purpose of the present invention is to provide a magnetic core with strong mechanical impact resistance, strong thermal shock resistance and high reliability.

[0004] Another object of the present invention is to provide an inductor element provided with the above magnetic core.

[0005] Another object of the present invention is to provide a product provided with the inductor element.

[0006] In order to achieve the main purpose of the present invention, the present invention provides a magnetic core, comprising a first blade, a second blade and a middle column, wherein the middle column is connected between the first blade and the second blade, wherein a chamfer is provided at the junction of the first blade and the middle column, and a chamfer is provided at the junction of the second blade and the middle column, and the radius of the chamfer is R; in the axial direction of the middle column, the first blade and the second blade have a gap, and the height of the gap is E; the thickness of the first blade is D1, and in the first length direction of the first blade, the first blade has a first extension length L1 relative to the middle column; the thickness of the second blade is D2, and in the second length direction of the second blade, the second blade has a second extension length L2 relative to the middle column; if and , then the radius R satisfies the following relationship: ;like and , then the radius R satisfies the following relationship: ;like and , then the radius R satisfies the following relationship: ;like , then the radius R satisfies the following relationship: ;like , then the radius R satisfies the following relationship: .

[0007] As can be seen from the above, by setting the fillet, the transition between the center column and the blade is smooth, and the force transmission is smoother, so as to avoid the thermal stress generated by the magnetic epoxy adhesive under the impact of thermal cycle from being concentrated at the junction between the center column and the blade, thereby preventing the junction between the center column and the blade from cracking; and by designing the radius of the fillet, it is avoided that when the radius R is too small, the junction between the center column and the blade still cracks, and when the radius R is too large, it is avoided that the winding space is occupied; in addition, by designing the relationship between the radius R and the blade thickness (such as D1, D2), the blade extension length (such as L1, L2) and the blade gap height E, a reasonable matching relationship is formed between the sizes of the various parts of the magnetic core.

[0008] A preferred solution is that the cross-section of the center column is circular; in the first length direction, the distance between the first side surface of the first blade and the section of the center column closest to the first side surface and parallel to the first side surface is the first extension length L1; in the second length direction, the distance between the second side surface of the second blade and the section of the center column closest to the second side surface and parallel to the second side surface is the second extension length L2; the first length direction is parallel to the second length direction.

[0009] As can be seen from the above, the center column with a circular cross section can make the magnetic field more evenly distributed around it, and effectively reduce such losses, thereby improving the efficiency of the inductor element provided with the magnetic core.

[0010] Another preferred solution is that the cross-section of the center column is runway-shaped; the third length direction, the first length direction, and the second length direction of the runway-shaped cross-section are parallel to each other; in the first length direction, the distance between the first side surface of the first blade and the third side surface of the center column closest to the first side surface and parallel to the first side surface is the first extension length L1; in the second length direction, the distance between the second side surface of the second blade and the third side surface of the center column closest to the second side surface and parallel to the second side surface is the second extension length L2.

[0011] It can be seen from the above that the center column with a runway-shaped cross-section can improve space utilization, and within a given space range, the center column with a runway-shaped cross-section has a larger effective magnetic conductive area than the center column with a circular cross-section, thereby making it possible to increase performance parameters such as inductance without increasing the overall volume of the magnetic core.

[0012] Another preferred solution is that the cross-section of the center column is rectangular; in the first length direction, the distance between the first side surface of the first blade and the fourth side surface of the center column closest to the first side surface and parallel to the first side surface is the first extension length L1; in the second length direction, the distance between the second side surface of the second blade and the fourth side surface of the center column closest to the second side surface and parallel to the second side surface is the second extension length L2; the first length direction is parallel to the second length direction.

[0013] As can be seen from the above, the middle column with a rectangular cross section can guide the magnetic field according to the directions of its long side and short side, and can make the manufacture of the magnetic core relatively simple.

[0014] In a further embodiment, the magnetic core is made of ferrite material.

[0015] As can be seen from the above, the use of ferrite to make the magnetic core has higher magnetic permeability and lower hysteresis loss and eddy current loss.

[0016] A further solution is that the magnetic core is formed by cutting a square blank formed by a positive pressure molding process, or the magnetic core is formed by cutting a square blank formed by a side pressure molding process; or the magnetic core is formed by integral molding and pressing of a mold.

[0017] As can be seen from the above, forming a square blank by positive pressure or pressure measurement and cutting the square blank into a magnetic core can reduce mold costs, improve the flexibility of magnetic core production, and make the magnetism have higher dimensional accuracy; while using a mold to form a magnetic core in one piece is conducive to improving production efficiency and ensuring the consistency of each magnetic core, while also making the spacing of the magnetic core have higher dimensional accuracy.

[0018] In order to achieve another purpose of the present invention, the present invention provides an inductor component, including winding wire and magnetic epoxy glue, wherein it also includes the above-mentioned magnetic core, one of the first blade and the second blade is an electrode blade, and the other is a printing blade; the winding wire is wound on the middle column, and the two end legs of the winding wire are arranged at the electrode blade, and the magnetic epoxy glue fills the gap and covers the winding wire.

[0019] As can be seen from the above, by adopting the above magnetic core, the inductor element is not easy to crack due to thermal stress after heat treatment, thereby improving the reliability of the inductor element and improving the yield rate of the inductor element production.

[0020] A further solution is that two end foot accommodating grooves are provided on the side of the electrode blade facing away from the printing blade, and one end foot of the winding is located in one end foot accommodating groove; the end foot accommodating groove is filled with an electrode coating layer.

[0021] As can be seen from the above, providing the electrode coating layer can not only reliably fix the end pins of the winding in the end pin receiving grooves, but also prevent the end pins from being worn, and at the same time can also enhance the conductivity.

[0022] In order to achieve another object of the present invention, the present invention provides a product, including a printed circuit board, which also includes the above-mentioned inductor element, and the inductor element is mounted on the printed circuit board and electrically connected to the printed circuit board.

[0023] It can be seen from the above that the product equipped with the above-mentioned inductor element has stronger reliability, mechanical impact resistance, and thermal shock resistance.

[0024] A further solution is that the product may be an electrical device or a means of transportation.

[0025] As can be seen from the above, inductor components can be applied to different categories of products and have a wide range of applications and high practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram from a first viewing angle when the cross section of the middle column of the magnetic core embodiment of the present invention is circular.

[0027] Figure 2 It is a structural schematic diagram of a magnetic core embodiment of the present invention when the cross section of the middle column is circular at a second viewing angle.

[0028] Figure 3 It is a schematic structural diagram of a magnetic core embodiment of the present invention when the cross section of the middle column is in a racetrack shape.

[0029] Figure 4 It is a schematic structural diagram of a magnetic core embodiment of the present invention when the cross section of the middle column is rectangular.

[0030] Figure 5 It is a partial cross-sectional schematic diagram of an embodiment of an inductor element of the present invention.

[0031] The present invention is further described below in conjunction with the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0032] Magnetic core embodiment Reference Figure 1 and Figure 2The magnetic core 1 has a first blade 11, a second blade 12 and a middle column 13, and the middle column 13 is connected between the first blade 11 and the second blade 12, so that the shape of the magnetic core 1 is roughly I-shaped. Among them, a chamfer is provided at the junction of the first blade 11 and the middle column 13, and a chamfer is also provided at the junction of the second blade 12 and the middle column 13, and the radius of the chamfer is R; the chamfer can make the middle column 13 and the first blade 11 and the second blade 12 transition smoothly at the junction, thereby making the force transmission at the junction of the middle column 13 and the first blade 11 and the second blade 12 smoother, so as to avoid the thermal stress generated by the magnetic epoxy adhesive under the impact of thermal cycle to be concentrated at the junction of the middle column 13 and the first blade 11 and / or the second blade 12, thereby preventing the junction of the middle column 13 and the first blade 11 and / or the second blade 12 from cracking.

[0033] In the axial direction of the center column 13, the first blade 11 and the second blade 12 have a gap, the height of the gap is E, and the gap is used to accommodate the winding and the magnetic epoxy glue. In addition, the thickness of the first blade 11 is D1, and in the first length direction of the first blade 11, the first blade 11 has a first extension length L1 relative to the center column 13; similarly, the thickness of the second blade 12 is D2, and in the second length direction of the second blade 12, the second blade 12 has a second extension length L2 relative to the center column 13.

[0034] It can be understood that when the radius R of the chamfer is too small, the thermal stress generated by the magnetic epoxy glue under the impact of thermal cycling will still be concentrated at the junction of the middle column 13 and the first blade 11 and / or the second blade 12, which will still cause cracks at the junction of the middle column 13 and the first blade 11 and / or the second blade 12; and as the radius R of the chamfer gradually increases, the thermal stress will gradually become uniform, making it less likely for cracks to occur; however, although the larger the radius R of the chamfer, the more it can ensure that the junction of the middle column 13 and the first blade 11 and / or the second blade 12 will not be broken due to the stress concentration generated by the magnetic epoxy glue, the larger the radius R of the chamfer, the more space it occupies for winding, thereby affecting the performance of the inductor component provided with the magnetic core 1, and it is necessary to ensure that the radius R of the chamfer is designed reasonably.

[0035] In order to ensure the performance of the inductor component and prevent the thermal stress generated by the magnetic epoxy adhesive from causing cracks at the junction of the middle column 13 and the first blade 11 and / or the second blade 12, the radius R of the chamfered corner at the junction of the middle column 13 and the first blade 11 and the radius R of the chamfered corner at the junction of the middle column 13 and the second blade 12 are designed as follows: In this embodiment, the shapes of the first blade 11 and the second blade 12 are substantially similar, so that the thickness D1 of the first blade 11 is equal to the thickness D2 of the second blade 12, and the first extension length L1 of the first blade 11 relative to the center column 13 is equal to the second extension length L2 of the second blade 12 relative to the center column 13, that is, and , at this time, the radius R of the fillet satisfies the following relationship: .

[0036] The radius R of the chamfer designed by the above relationship can avoid the radius R of the chamfer being too small, which may cause cracks at the junction of the center column 13 and the first blade 11 and / or the second blade 12, and can also avoid the radius R of the chamfer being too large, which may occupy the winding space.

[0037] In addition, by designing the relationship between the radius R of the fillet and the blade thickness (such as the thickness D1 of the first blade 11 and the thickness D2 of the second blade 12), the blade extension length (such as the first extension length L1 and the second extension length L2), and the blade gap height E, a reasonable matching relationship is formed between the sizes of the various parts of the magnetic core 1; for example, when the corresponding size conditions are met to determine the value range of the fillet radius R, it can be ensured that the magnetic core 1 can achieve a relatively good balance in terms of magnetic field distribution, electromagnetic induction and other performances under different blade thickness and extension length comparison conditions. For example, in application scenarios such as inductance, a suitable fillet radius R can make the magnetic field distribution inside the magnetic core 1 more uniform, which helps to reduce the occurrence of adverse phenomena such as local magnetic saturation of the magnetic core 1, thereby improving the performance and working reliability of the inductor component constructed based on the magnetic core 1.

[0038] Furthermore, a reasonable fillet radius R and the coordination between various dimensions can enable the magnetic core 1 to play a more ideal role in guiding and converging the magnetic field during operation. For example, it can improve the rationality of the distribution of the magnetic flux density in the magnetic core 1. In devices such as inductors that use the magnetic core 1, it helps to better realize the conversion between electrical energy and magnetic energy, reduce energy loss, and improve the working efficiency and overall performance of related electrical equipment.

[0039] In addition, in the present embodiment, the first blade 11 and the second blade 12 are in the shape of rectangular plates, and the cross-section of the middle column 13 is circular; therefore, it can be understood that, in the first length direction of the first blade 11, the distance between the first side surface 111 of the first blade 11 and the section 131 of the middle column 13 closest to the first side surface 111 and parallel to the first side surface 111 is the first extension length L1, and similarly, in the second length direction of the second blade 12, the distance between the second side surface 121 of the second blade 12 and the section 131 of the middle column 13 closest to the second side surface 121 and parallel to the second side surface 121 is the second extension length L2; the first length direction is parallel to the second length direction; wherein, the first length direction of the first blade 11 is parallel to the second length direction of the second blade 12. Setting the middle column 13 as a cylinder (even if the cross section of the middle column 13 is circular) can make the magnetic field more evenly distributed around it, and effectively reduce this loss, thereby improving the efficiency of the inductor element provided with the magnetic core 1; and, since the cross section of the middle column 13 is uniform and regular, and the difference in the circumferential direction is small, according to the Ampere loop theorem, the magnetic flux conduction is more stable, and the magnetic saturation can be reduced, so that the inductor element provided with the magnetic core 1 can reduce eddy current loss at high frequencies, thereby improving the sensitivity and stability of the inductor element.

[0040] like Figure 3 or Figure 4 As shown, in some embodiments, if ,and When , the radius R of the fillet satisfies the following relationship: .

[0041] Similarly, in some embodiments, if and When , the radius R of the fillet satisfies the following relationship: .

[0042] Similarly, in some embodiments, if , then the radius R of the fillet satisfies the following relationship: .

[0043] Similarly, in some embodiments, if , then the radius R of the fillet satisfies the following relationship: .

[0044] It can be seen that for blades with equal thickness but different extension lengths (such as , ) and unequal leaf thickness ( , ) and other possible practical situations, and respectively gives the appropriate value range of the fillet radius R, which allows the design of the magnetic core 1 to adapt to different manufacturing process requirements and specific usage scenarios, and has the potential for application in electromagnetic products of different specifications and different performance emphases, thereby improving its versatility and scope of application.

[0045] In some embodiments, the shape of the first blade 11 and the shape of the second blade 12 may be different, so as to expand the application scope of the magnetic core 1, meet the use requirements of different use scenarios, and enable the magnetic core 1 to have different performances. Figure 3 As shown, the first blade 11 can be roughly arranged to be an octagon, and the second blade 12 can be roughly arranged to be a dodecagon; for example, Figure 4 As shown, the first blade 11 and the second blade 12 can be roughly arranged to be twelve-deformed, but the shapes of the first blade 11 and the second blade 12 are not completely the same.

[0046] Another example Figure 3 As shown, in some embodiments, the cross-section of the middle column 13 is runway-shaped, and the third length direction of the runway-shaped cross-section, the first length direction of the first blade 11, and the second length direction of the second blade 12 are parallel to each other; based on this, it can be understood that in the first length direction of the first blade 11, the distance between the first side surface 111 of the first blade 11 and the third side surface 132 of the middle column 13 closest to the first side surface 111 and parallel to the first side surface 111 (i.e., the section 131 of the arc surface of the middle column 13 in the shape of a runway column) is the first extension length L1, and in the second length direction of the second blade 12, the distance between the second side surface 121 of the second blade 12 and the third side surface 132 of the middle column 13 closest to the second side surface 121 and parallel to the second side surface 121 is the second extension length L2. It can be seen that the middle column 13 with a runway-shaped cross section can improve the space utilization rate, and within a given space range, the middle column 13 with a runway-shaped cross section has a larger effective magnetic conductive area than the middle column 13 with a circular cross section, so that without increasing the overall volume of the magnetic core 1, it is possible to increase performance parameters such as the inductance value. In addition, the runway-shaped magnetic field distribution has unique advantages. It has different magnetic field characteristics in the long axis direction and the short axis direction, and can guide the direction of the magnetic field according to specific application requirements; for example, in some device applications that require a directional magnetic field, by reasonably designing the long axis and short axis directions of the middle column 13 with a runway-shaped cross section, the magnetic field can be more concentratedly distributed in the desired direction, thereby improving the sensitivity of the device to changes in the magnetic field direction. At the same time, the runway-shaped magnetic field distribution can also reduce the edge effect to a certain extent, making the transition of the magnetic field inside the magnetic core 1 smoother, and can better meet the needs of complex electromagnetic environments compared to some magnetic cores 1 with simple geometric shapes.

[0047] Another example Figure 4As shown, in some embodiments, the cross section of the middle column 13 is rectangular; based on this, it can be understood that in the first length direction of the first blade 11, the distance between the first side surface 111 of the first blade 11 and the fourth side surface 133 of the middle column 13 closest to the first side surface 111 and parallel to the first side surface 111 is the first extension length L1, and in the second length direction of the second blade 12, the distance between the second side surface 121 of the second blade 12 and the fourth side surface 133 of the middle column 13 closest to the second side surface 121 and parallel to the second side surface 121 is the second extension length L2; wherein the first length direction is parallel to the second length direction. The middle column 13 is set as a rectangular column (even if the cross section of the middle column 13 is rectangular), so that the magnetic field can be guided according to the long side and short side directions of the cross section of the middle column 13, and the manufacture of the magnetic core 1 can be relatively simple. It can be understood that the first extension distance L1 and the second extension distance both follow the maximum value principle, that is, the first extension distance L1 is usually the maximum distance between the first side surface 111 of the first blade 11 and the side surface (such as the middle column 13 with a runway-shaped cross-section, the middle column 13 with a polygonal cross-section) or the cross-section (such as the middle column 13 with a circular cross-section) of the center column 13, and the first extension distance L2 is the maximum distance between the first side surface 121 of the first blade 12 and the side surface (such as the middle column 13 with a runway-shaped cross-section, the middle column 13 with a polygonal cross-section) or the cross-section (such as the middle column 13 with a circular cross-section) of the center column 13.

[0048] In this embodiment, the magnetic core 1 is made of ferrite material, so that the magnetic core 1 has a higher magnetic permeability, so that under the same current or magnetic field, it can generate a stronger magnetic induction intensity, thereby achieving a larger inductance value in a smaller volume; at the same time, the hysteresis loss of the magnetic core 1 is low, and because the resistivity of ferrite is relatively high, when the alternating magnetic field passes through, the eddy current generated is smaller, so the eddy current loss of the magnetic core 1 made of ferrite is also smaller.

[0049] In some embodiments, the ferrite material may be first formed into a square blank by a positive pressure forming process, and then the square blank may be processed by a cutting process to form the magnetic core 1; or, the ferrite material may be first formed into a square blank by a side pressure forming process, and then the square blank may be processed by a cutting process to form the magnetic core 1. Forming the square blank by positive pressure or pressure measurement and cutting the square blank into the magnetic core 1 can reduce mold costs, improve the production flexibility of the magnetic core 1, and enable the magnetic core 1 to have a higher dimensional accuracy.

[0050] In some embodiments, the magnetic core 1 may also be pressed out by integral mold forming. Using integral mold forming to press out the magnetic core 1 is beneficial to improving production efficiency and ensuring the consistency of each magnetic core 1 , while also enabling the spacing of the magnetic cores 1 to have a higher dimensional accuracy.

[0051] In summary, it can be seen that by designing the radius R of the chamfer at the junction of the middle column 13 of the magnetic core 1 and the first blade 11 and the second blade 12, the junction of the middle column 13 and the first blade 11 and the second blade 12 will not crack under the thermal stress generated by the magnetic epoxy adhesive under thermal cycle impact, so that the magnetic core 1 has strong mechanical impact resistance, strong heat and cold shock resistance and high reliability.

[0052] Inductor Component Embodiment Reference Figure 5 The inductor element 100 includes a winding 2, a magnetic epoxy glue 3 and the magnetic core 1 described in the above magnetic core embodiment, wherein one of the first blade 11 and the second blade 12 is an electrode blade and the other is a printing blade. For example, in this embodiment, the first blade 11 is a printing blade and the second blade 12 is an electrode blade. The winding 2 is wound on the middle column 13, and the two end legs 21 of the winding 2 are arranged at the electrode blades. The magnetic epoxy glue 3 fills the gap and covers the winding 2. By adopting the above magnetic core 1, the inductor element 100 is not easy to crack due to thermal stress after heat treatment, thereby improving the reliability of the inductor element 100 and improving the yield rate of the inductor element 100.

[0053] In some embodiments, two end pin accommodating grooves 121 are provided on the side of the electrode blade facing away from the printing blade, and one end pin 21 of the winding 2 is located in one end pin accommodating groove 121; the end pin accommodating groove 121 is filled with an electrode coating layer 4. Providing the electrode coating 4 layer can not only reliably fix the end pin 21 of the winding 2 in the end pin accommodating groove 121, but also prevent the end pin 21 from being worn, and also enhance the conductivity.

[0054] Product Examples The product includes a printed circuit board and the inductor element described in the above-mentioned inductor element embodiment, and the inductor element is mounted on the printed circuit board and electrically connected to the printed circuit board. The product is provided with the above-mentioned inductor element to enhance its reliability, mechanical impact resistance and thermal shock resistance. Among them, the products include but are not limited to electrical equipment, transportation vehicles, etc.; it can be seen that the inductor element can be applied to different categories of products, with a wide range of applications and high practicality.

[0055] Finally, it should be emphasized that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A magnetic core, comprising a first blade, a second blade and a middle column, wherein the middle column is connected between the first blade and the second blade, characterized in that: A chamfer is provided at the junction of the first blade and the center column, and the chamfer is provided at the junction of the second blade and the center column, and the radius of the chamfer is R; In the axial direction of the center column, a gap exists between the first blade and the second blade, and the height of the gap is E; The thickness of the first blade is D1, and in the first length direction of the first blade, the first blade has a first extension length L1 relative to the center column; The thickness of the second blade is D2, and in the second length direction of the second blade, the second blade has a second extension length L2 relative to the center column; like and , then the radius R satisfies the following relationship: ; like and , then the radius R satisfies the following relationship: ; like and , then the radius R satisfies the following relationship: ; like , then the radius R satisfies the following relationship: ; like , then the radius R satisfies the following relationship: .

2. The magnetic core according to claim 1, characterized in that: The cross section of the center column is circular; In the first length direction, the distance between the first side surface of the first blade and the section of the center column closest to the first side surface and parallel to the first side surface is the first extension length L1; In the second length direction, the distance between the second side surface of the second blade and the section of the center column closest to the second side surface and parallel to the second side surface is the second extension length L2; The first length direction is parallel to the second length direction.

3. The magnetic core according to claim 1, characterized in that: The cross section of the center column is in the shape of a racetrack; The third length direction of the racetrack-shaped cross section, the first length direction and the second length direction are parallel to each other; In the first length direction, the distance between the first side surface of the first blade and the third side surface of the center column closest to the first side surface and parallel to the first side surface is the first extension length L1; In the second length direction, the distance between the second side surface of the second blade and the third side surface of the center column closest to the second side surface and parallel to the second side surface is the second extension length L2.

4. The magnetic core according to claim 1, characterized in that: The cross section of the center column is rectangular; In the first length direction, the distance between the first side surface of the first blade and the fourth side surface of the center column closest to the first side surface and parallel to the first side surface is the first extension length L1; In the second length direction, the distance between the second side surface of the second blade and the fourth side surface of the center column closest to the second side surface and parallel to the second side surface is the second extension length L2; The first length direction is parallel to the second length direction.

5. The magnetic core according to any one of claims 1 to 4, characterized in that: The magnetic core is made of ferrite material.

6. The magnetic core according to claim 5, characterized in that The magnetic core is formed by cutting a square blank formed by a positive pressure forming process, or The magnetic core is formed by cutting a square blank formed by a side pressing forming process using a cutting process; or The magnetic core is formed by integral molding and pressing through a mold.

7. Inductive component, including winding and magnetic epoxy adhesive, characterized in that: Also includes the magnetic core according to any one of claims 1 to 6, wherein one of the first blade and the second blade is an electrode blade and the other is a printing blade; The winding wire is wound on the center column, and the two end feet of the winding wire are arranged at the electrode blades. The magnetic epoxy glue fills the gap and covers the winding wire.

8. The inductor element according to claim 7, characterized in that: Two end foot accommodating grooves are provided on the side of the electrode blade facing away from the printing blade, and one end foot of the winding is located in one of the end foot accommodating grooves; The end pin accommodating groove is filled with an electrode coating layer.

9. Products, including printed circuit boards, characterized in that It also includes the inductor element as claimed in claim 7 or 8, wherein the inductor element is mounted on the printed circuit board and electrically connected to the printed circuit board.

10. The product according to claim 9, characterized in that The product may be an electrical device or a vehicle.

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