Magnetic core, inductive element and product

Abstract

The application provides a magnetic core, an inductance element and a product. The magnetic core has a first blade, a second blade and a middle column. The intersection of the first blade, the second blade and the middle column is provided with a fillet, and the radius of the fillet is R. In the axial direction of the middle column, the first blade and the second blade have a gap with a height of E. The thickness of the first blade is D1, and the first blade has a first overhanging 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 overhanging length L2 relative to the middle column in the length of the second blade. If D1 / E < 0.5 and D2 / E < 0.5, the radius R satisfies the following relationship: If D1 / E > 0.5 and D2 / E < 0.5, the radius R satisfies the following relationship: If D1 / E < 0.5 and D2 / E > 0.5, the radius R satisfies the following relationship: If D1 / E > 0.5 and D2 / E > 0.5, the radius R satisfies the following relationship: If D1 / E > 0.5, the radius R satisfies the following relationship: If D2 / E > 0.5, the radius R satisfies the following relationship. The product is provided with the inductance element, and the inductance element is provided with the above magnetic core. The magnetic core has high mechanical impact resistance, high cold and hot impact resistance and high reliability.

Description

TECHNICAL FIELD

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

[0002] In the production process of the existing magnetic glue inductor, after winding on the I-shaped magnetic core, it is necessary to fill the magnetic epoxy glue in the gap of the I-shaped magnetic core and make the magnetic epoxy glue cover the winding. The magnetic epoxy glue plays a structural supporting role and improves the magnetic performance of the magnetic glue inductor, enhances the heat dissipation performance of the magnetic glue inductor, and improves the moisture-proof and chemical protection ability of the magnetic glue inductor. The I-shaped magnetic core has a first blade, a second blade and a column, and the column is connected between the first blade and the second blade. The junctions of the first blade and the column and the junctions of the second blade and the column are almost right angle transitions. Since the existing I-shaped magnetic core is supported by brittle material ferrite, there is a large difference between the expansion coefficients of the ferrite material and the magnetic epoxy glue, and there is a certain shrinkage rate in the curing process of the magnetic epoxy glue. Therefore, the thermal stress generated after heat treatment is easy to exceed the tolerance limit of the ferrite, resulting in cracking at the junctions of the blades and the column. SUMMARY

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

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

[0005] Still another purpose of the present application is to provide a product provided with the inductor element.

[0006] In order to achieve the main purpose of the present application, the present application provides a magnetic core, which has a first blade, a second blade and a column, and the column is connected between the first blade and the second blade. The junction of the first blade and the column is provided with a rounded corner, and the junction of the second blade and the column is provided with a rounded corner. The radius of the rounded corner is R. In the axial direction of the 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 overhanging length L1 relative to the 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 overhanging length L2 relative to the column. If and The radius R satisfies the following relationship: If and The radius R satisfies the following relationship: If and If R is greater than 0, the radius R satisfies the following relationship: If R is greater than 0, the radius R satisfies the following relationship: If R is greater than 0, the radius R satisfies the following relationship: If R is greater than 0, the radius R satisfies the following relationship: If R is greater than 0, the radius R satisfies the following relationship: .

[0007] As can be seen from the above, by setting the chamfer, the junction of the center column and the blade is smoothly transitioned, and the force transmission is more gentle, avoiding the thermal stress generated by the magnetic epoxy adhesive under thermal cycling from concentrating at the junction of the center column and the blade, thereby preventing cracking at the junction of the center column and the blade; and by designing the radius of the chamfer, when the radius R is too small, the junction of the center column and the blade still cracks, and when the radius R is too large, the winding space is occupied; in addition, by designing the relationship between the radius R and the thickness of the blade (such as D1, D2), the length of the blade extension (such as L1, L2), and the height of the blade gap E, a reasonable matching relationship is formed between the dimensions of the magnetic core.

[0008] One preferred scheme 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 tangent 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 tangent 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.

[0009] As can be seen from the above, the center column with a circular cross section can make the distribution of the magnetic field around it more uniform, effectively reduce such loss, and improve the efficiency of the inductance element provided with the magnetic core.

[0010] Another preferred scheme is that the cross section of the center column is track-shaped; the third length direction, the first length direction and the second length direction of the track-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] As can be seen from the above, the center column with a track-shaped cross section can improve the space utilization rate, and in a given space range, the center column with a track-shaped cross section has a larger effective magnetic conduction area than the center column with a circular cross section, so that it is possible to increase performance parameters such as inductance value without increasing the overall volume of the magnetic core.

[0012] Another preferred solution is that the cross section of the middle column is rectangular; in the first length direction, the distance between the first side of the first leaf and the fourth side of the middle column closest to the first side and parallel to the first side is the first overhanging length L1; in the second length direction, the distance between the second side of the second leaf and the fourth side of the middle column closest to the second side and parallel to the second side is the second overhanging 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 the rectangular cross section can guide the magnetic field according to the long side and the short side directions, and the manufacturing of the magnetic core can be relatively simple.

[0014] A further solution is that the magnetic core is made of ferrite material.

[0015] As can be seen from the above, the magnetic core made of ferrite has high magnetic permeability and low hysteresis loss and low eddy current loss.

[0016] A further solution is that the magnetic core is cut from the square blank formed by the cutting process on the square blank formed by the direct compression process, or the magnetic core is cut from the square blank formed by the cutting process on the square blank formed by the side compression process; or the magnetic core is integrally formed by the mold.

[0017] As can be seen from the above, the square blank is formed by direct compression or side compression and the magnetic core is cut from the square blank, which can reduce the cost of the mold, improve the production flexibility of the magnetic core, and make the magnetic core have high dimensional accuracy; and the magnetic core is integrally formed by the mold, which can improve the production efficiency, ensure the consistency of each magnetic core, and make the spacing of the magnetic core have high dimensional accuracy.

[0018] In order to achieve another object of the present application, the present application provides an inductance element comprising a winding and a magnetic epoxy, wherein the magnetic core, one of the first leaf and the second leaf is an electrode leaf, and the other is an ink leaf; the winding is wound on the middle column, the two ends of the winding are provided at the electrode leaf, and the magnetic epoxy fills the gap and covers the winding.

[0019] As can be seen from the above, the inductance element adopts the above-mentioned magnetic core, so that the magnetic core is not easy to crack due to thermal stress after heat treatment, which improves the reliability of the inductance element and improves the yield of inductance element production.

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

[0021] As can be seen from the above, the electrode coating layer can not only reliably fix the end foot of the winding in the end foot accommodating groove, but also prevent the end foot from being worn, and also enhance the conductivity.

[0022] In order to achieve another object of the present application, the present application provides a product comprising a printed circuit board, wherein the inductance element as described above is further included, and the inductance element is mounted on the printed circuit board and electrically connected with the printed circuit board.

[0023] From the above, it can be seen that the product provided with the inductance element has stronger reliability, mechanical impact resistance and cold-hot impact resistance.

[0024] Further, the product can be an electrical equipment or a vehicle.

[0025] From the above, it can be seen that the inductance element can be applied to different types of products, and has a wide application range and high practicability. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a structural schematic view of the middle column of the magnetic core embodiment of the present application in a first view angle when the cross section of the middle column is circular.

[0027] Figure 2 is a structural schematic view of the middle column of the magnetic core embodiment of the present application in a second view angle when the cross section of the middle column is circular.

[0028] Figure 3 is a structural schematic view of the middle column of the magnetic core embodiment of the present application when the cross section of the middle column is runway-shaped.

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

[0030] Figure 5 is a partial sectional view of the inductance element embodiment of the present application.

[0031] The present application is further described below in combination with the drawings and embodiments. DETAILED DESCRIPTION

[0032] Magnetic core embodiment

[0033] Reference Figure 1 and Figure 2The magnetic core 1 has a first leaf 11, a second leaf 12 and a column 13 connected between the first leaf 11 and the second leaf 12, so that the shape of the magnetic core 1 is approximately in the shape of an I-beam. The first leaf 11 and the column 13 are provided with a fillet at the junction, and the second leaf 12 and the column 13 are also provided with a fillet at the junction. The radius of the fillet is R. The fillet can make the column 13 and the first leaf 11 and the second leaf 12 smoothly transition at the junction, and further make the force transmission at the junction of the column 13 and the first leaf 11 and the second leaf 12 more gentle, so as to avoid the thermal stress generated by the magnetic epoxy under thermal cycle impact from being concentrated at the junction of the column 13 and the first leaf 11 and / or the second leaf 12, and further prevent the junction of the column 13 and the first leaf 11 and / or the second leaf 12 from cracking.

[0034] In the axial direction of the column 13, the first leaf 11 and the second leaf 12 have a gap with a height of E for accommodating the wire and the magnetic epoxy. In addition, the thickness of the first leaf 11 is D1, and in the first length direction of the first leaf 11, the first leaf 11 has a first overhanging length L1 relative to the column 13. Similarly, the thickness of the second leaf 12 is D2, and in the second length direction of the second leaf 12, the second leaf 12 has a second overhanging length L2 relative to the column 13.

[0035] It can be understood that when the radius R of the fillet is too small, the thermal stress generated by the magnetic epoxy under thermal cycle impact will still be concentrated at the junction of the column 13 and the first leaf 11 and / or the second leaf 12, and further cause cracks at the junction of the column 13 and the first leaf 11 and / or the second leaf 12. As the radius R of the fillet gradually increases, the thermal stress will gradually be uniformized, and further make it less likely to cause cracks. However, although the larger the radius R of the fillet is, the more it can ensure that the junction of the column 13 and the first leaf 11 and / or the second leaf 12 will not be broken by the stress concentration generated by the magnetic epoxy, the larger the radius R of the fillet is, the more it occupies the space of the wire, and further affects the performance of the inductor element provided with the magnetic core 1. Therefore, it is necessary to ensure that the radius R of the fillet is designed reasonably.

[0036] In order to ensure the performance of the inductor element and prevent the junction of the column 13 and the first leaf 11 and / or the second leaf 12 from cracking due to the thermal stress generated by the magnetic epoxy, the radius R of the fillet at the junction of the column 13 and the first leaf 11 and the fillet at the junction of the column 13 and the second leaf 12 is designed as follows:

[0037] In the present embodiment, the shapes of the first leaf 11 and the second leaf 12 are basically similar, so that the thickness D1 of the first leaf 11 is equal to the thickness D2 of the second leaf 12, and the first overhanging length L1 of the first leaf 11 relative to the column 13 is equal to the second overhanging length L2 of the second leaf 12 relative to the column 13, that is, and At this time, the radius R of the chamfer satisfies the following relationship: .

[0038] The radius R of the chamfer designed through the above relationship can not only avoid the radius R of the chamfer being too small to cause cracking at the junction of the center column 13 and the first and / or second blades 11 and 12, but also avoid the radius R of the chamfer being too large to occupy the space of the winding.

[0039] In addition, by designing the relationship between the radius R of the chamfer, the thickness of the blades (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 dimensions of the magnetic core 1. For example, when the corresponding size conditions are met to determine the value range of the radius R of the chamfer, the magnetic core 1 can achieve a relatively good balance in performance such as magnetic field distribution and electromagnetic induction under different blade thickness and extension length conditions. For example, in an inductance application scenario, a suitable radius R of the chamfer can make the magnetic field distribution inside the magnetic core 1 more uniform, which helps to reduce the occurrence of local magnetic saturation and other adverse phenomena of the magnetic core 1, and thus improves the performance and working reliability of the inductance element based on the magnetic core 1.

[0040] Furthermore, a reasonable radius R of the chamfer and the matching between the dimensions can make the magnetic core 1 play a more ideal role in guiding and converging the magnetic field during work, such as improving the rationality of the distribution of magnetic flux density inside the magnetic core 1, which helps to better achieve the conversion between electric energy and magnetic energy in devices using the magnetic core 1 such as inductance elements, reduces energy loss, and improves the working efficiency and overall performance of related electrical equipment.

[0041] In addition, in the embodiment, the first blade 11 and the second blade 12 are in a rectangular plate shape, and the cross section of the middle column 13 is in a circular shape; 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 tangent surface 131 of the middle column 13 closest to the first side surface 111 and parallel to the first side surface 111 is the first protruding 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 tangent surface 131 of the middle column 13 closest to the second side surface 121 and parallel to the second side surface 121 is the second protruding 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. The middle column 13 is set as a cylinder (even if the cross section of the middle column 13 is in a circular shape), which can make the distribution of the magnetic field around it more uniform, effectively reduce the loss, and improve the efficiency of the inductance element provided with the magnetic core 1; and since the cross section of the middle column 13 is uniform and regular, the difference in the circumferential direction is small, according to the Ampere loop theorem, the conduction of the magnetic flux is more stable, the magnetic saturation can be reduced, so that the inductance element provided with the magnetic core 1 can reduce the eddy current loss at high frequency, and improve the sensitivity and stability of the inductance element.

[0042] As Figure 3 or Figure 4 shown, in some embodiments, if and , then the radius R of the fillet satisfies the following relationship: .

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

[0044] Similarly, in some embodiments, if , then the radius R of the fillet satisfies the following relationship: .

[0045] Similarly, in some embodiments, if , then the radius R of the fillet satisfies the following relationship: .

[0046] As can be seen, for blades with equal thickness but different protruding lengths (such as , ) and blades with different thicknesses ( , etc. The suitable value range of the radius R of the rounded corner is given according to different actual situations, which makes the design of the magnetic core 1 adapt to different manufacturing process requirements and specific use scenarios, has application potential in electromagnetic products of different specifications and different performance focuses, and improves the universality and application range.

[0047] In some embodiments, the shape of the first leaf 11 and the shape of the second leaf 12 can be different, so as to expand the application range of the magnetic core 1, meet the use requirements of different use scenarios, and make the magnetic core 1 have different performances. For example, as shown in Figure 3 , the first leaf 11 can be roughly set as an octagon, and the second leaf 12 can be roughly set as a dodecagon; for example, as shown in Figure 4 , the first leaf 11 and the second leaf 12 can both be roughly set as a dodecagon, but the shapes of the first leaf 11 and the second leaf 12 are not completely the same.

[0048] For example, as shown in Figure 3 , in some embodiments, the cross section of the middle column 13 is in the shape of a racetrack, and the third length direction of the cross section in the shape of a racetrack, the first length direction of the first leaf 11 and the second length direction of the second leaf 12 are parallel to each other; based on this, it can be understood that in the first length direction of the first leaf 11, the distance between the first side surface 111 of the first leaf 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 tangent surface 131 of the arc surface of the middle column 13 in the shape of a racetrack column) is the first protruding length L1, and in the second length direction of the second leaf 12, the distance between the second side surface 121 of the second leaf 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 protruding length L2. It can be seen that the middle column 13 with the cross section in the shape of a racetrack can improve the space utilization, and in a given space range, the middle column 13 with the cross section in the shape of a racetrack has a larger effective magnetic area than the middle column 13 with the cross section in the shape of a circle, so that it is possible to increase the performance parameters such as inductance without increasing the overall volume of the magnetic core 1. In addition, the magnetic field distribution in the shape of a racetrack has unique advantages, and the magnetic field characteristics in the long axis direction and the short axis direction are different, which can guide the direction of the magnetic field according to the specific application requirements; for example, in some device applications that require directional magnetic field, by reasonably designing the long axis and short axis directions of the middle column 13 with the cross section in the shape of a racetrack, the magnetic field can be more concentrated in the expected direction, improving the sensitivity of the device to the change of the magnetic field direction. At the same time, the magnetic field distribution in the shape of a racetrack can also reduce the edge effect to a certain extent, so that the transition of the magnetic field inside the magnetic core 1 is smoother, which can better meet the complex electromagnetic environment requirements compared with some simple geometric magnetic cores 1.

[0049] For example, as shown in Figure 4As shown, in some embodiments, the cross section of the pillar 13 is rectangular; based on this, it can be understood that, in the first length direction of the first leaf 11, the distance between the first side surface 111 of the first leaf 11 and the fourth side surface 133 of the pillar 13 closest to the first side surface 111 and parallel to the first side surface 111 is the first protruding length L1, and in the second length direction of the second leaf 12, the distance between the second side surface 121 of the second leaf 12 and the fourth side surface 133 of the pillar 13 closest to the second side surface 121 and parallel to the second side surface 121 is the second protruding length L2; wherein the first length direction is parallel to the second length direction. By setting the pillar 13 as a rectangular column (i.e., the cross section of the pillar 13 is rectangular), the magnetic field can be guided according to the long side and short side directions of the cross section of the pillar 13, and the manufacturing of the magnetic core 1 can be relatively simple. It can be understood that the first protruding distance L1 and the second protruding distance L2 both follow the maximum principle, i.e., generally the first protruding distance L1 is the maximum distance between the first side surface 111 of the first leaf 11 and the side surface (such as the pillar 13 with a runway-shaped cross section, the pillar 13 with a polygonal cross section) or the tangent surface (such as the pillar 13 with a circular cross section) of the pillar 13, and the second protruding distance L2 is the maximum distance between the first side surface 121 of the first leaf 12 and the side surface (such as the pillar 13 with a runway-shaped cross section, the pillar 13 with a polygonal cross section) or the tangent surface (such as the pillar 13 with a circular cross section) of the pillar 13.

[0050] In the present embodiment, the magnetic core 1 is made of ferrite material, so that the magnetic core 1 has high magnetic permeability, so as to be able to generate stronger magnetic induction intensity under the same current or magnetic field action, thereby realizing larger inductance value in smaller volume; at the same time, the magnetic core 1 has low magnetic hysteresis loss, and since the resistivity of ferrite is high, the eddy current generated when the alternating magnetic field passes through is small, so the eddy current loss of the magnetic core 1 made of ferrite is also small.

[0051] In some embodiments, the ferrite material can be first formed into a square blank through a positive pressure forming process, and then the square blank is processed through a cutting process to form the magnetic core 1; or the ferrite material can be first formed into a square blank through a side pressure forming process, and then the square blank is processed through a cutting process to form the magnetic core 1. By forming a square blank through positive pressure or pressure forming and cutting the square blank to form the magnetic core 1, the mold cost can be reduced, the production flexibility of the magnetic core 1 can be improved, and the magnetic core 1 can have high dimensional accuracy.

[0052] In some embodiments, the magnetic core 1 can also be integrally formed by a mold, and the use of mold integral forming to make the magnetic core 1 is conducive to improving production efficiency and ensuring the consistency of each magnetic core 1, and also enables the spacing of the magnetic core 1 to have high dimensional accuracy.

[0053] As can be seen from the above, by designing the radius R of the rounded corner at the junction of the middle column 13 and the first leaf 11 and the second leaf 12 of the magnetic core 1, the junction of the middle column 13 and the first leaf 11 and the second leaf 12 will not crack under the thermal stress generated by the magnetic epoxy glue under the thermal cycle impact, so that the magnetic core 1 has strong mechanical impact resistance, strong cold and hot impact resistance and high reliability.

[0054] Inductor embodiment

[0055] Reference Figure 5 The inductor 100 comprises the winding 2, the magnetic epoxy glue 3 and the magnetic core 1 described in the above magnetic core embodiment, wherein one of the first leaf 11 and the second leaf 12 is an electrode leaf and the other is a printing leaf, and in this embodiment, the first leaf 11 is a printing leaf and the second leaf 12 is an electrode leaf. The winding 2 is wound on the middle column 13, and the two ends 21 of the winding 2 are arranged at the electrode leaf, and the magnetic epoxy glue 3 fills the gap and covers the winding 2. The inductor 100 uses the above magnetic core 1, so that the magnetic core 1 is not easy to crack due to thermal stress after heat treatment, thereby improving the reliability of the inductor 100 and improving the yield of the inductor 100 production.

[0056] In some embodiments, two end foot accommodating grooves 121 are arranged on the side of the electrode leaf away from the printing leaf, and one end foot 21 of the winding 2 is located in one end foot accommodating groove 121; the electrode coating layer 4 is filled in the end foot accommodating groove 121. The electrode coating layer 4 can not only reliably fix the end foot 21 of the winding 2 in the end foot accommodating groove 121, but also prevent the end foot 21 from being worn, and also enhance the conductivity.

[0057] Product embodiment

[0058] The product comprises a printed circuit board and the inductor described in the above inductor embodiment, and the inductor is mounted on the printed circuit board and electrically connected with the printed circuit board. The product uses the above inductor, so that the reliability, mechanical impact resistance and cold and hot impact resistance of the product are stronger. The product includes but is not limited to electrical equipment, vehicles and the like; it can be seen that the inductor can be applied to different categories of products, has a wide range of application and high practicability.

[0059] Finally, it should be emphasized that the above description is only the preferred embodiment of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A magnetic core having a first leaf, a second leaf and a web connecting between the first leaf and the second leaf, characterized in that: a fillet is provided at the junction of the first leaf and the web, and a fillet is provided at the junction of the second leaf and the web, the radius of the fillet being R; in the axial direction of the web, the first leaf and the second leaf have a gap, the height of the gap being E; the thickness of the first leaf is D1, and in the first length direction of the first leaf, the first leaf has a first overhang length L1 relative to the web; the thickness of the second leaf is D2, and in the second length direction of the second leaf, the second leaf has a second overhang length L2 relative to the web; If and then the radius R satisfies the following relation: ; If and then the radius R satisfies the following relation: ; If and then the radius R satisfies the following relation: ; If then the radius R satisfies the following relation: ; If then the radius R satisfies the following relation: . 2.A magnetic core according to claim 1, characterized in that: the cross section of the web is circular; in the first length direction, the distance between the first side of the first leaf and the tangent plane of the web closest to the first side and parallel to the first side is the first overhang length L1; in the second length direction, the distance between the second side of the second leaf and the tangent plane of the web closest to the second side and parallel to the second side is the second overhang length L2; the first length direction is parallel to the second length direction. 3.A magnetic core according to claim 1, characterized in that: the cross section of the web is track-shaped; the third length direction of the track-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 of the first leaf and the third side of the web closest to the first side and parallel to the first side is the first overhang length L1; in the second length direction, the distance between the second side of the second leaf and the third side of the web closest to the second side and parallel to the second side is the second overhang length L2. 4.A magnetic core according to claim 1, characterized in that: the cross section of the web is rectangular; in the first length direction, the distance between the first side of the first leaf and the fourth side of the web closest to the first side and parallel to the first side is the first overhang length L1; in the second length direction, the distance between the second side of the second leaf and the fourth side of the web closest to the second side and parallel to the second side is the second overhang length L2; the first length direction is parallel to the second length direction. 5.A magnetic core according to any one of claims 1 to 4, characterized in that: the magnetic core is made of ferrite material. 6.A magnetic core according to claim 5, characterized in that the magnetic core is cut from a square blank formed by a cutting process on a positive compression molding process, or the magnetic core is cut from a square blank formed by a cutting process on a side compression molding process; or the magnetic core is integrally formed by a mold. 7.An inductor element comprising a winding and a magnetic epoxy, characterized in that: The magnetic core also includes the first leaf and the second leaf, one of which is an electrode leaf and the other is a printing leaf. The winding is wound on the center column, and the two ends of the winding are provided at the electrode leaf, and the magnetic epoxy fills the gap and covers the winding.

8. The inductive element according to claim 7, characterized in that: The electrode leaf is provided with two end foot accommodating grooves on the side away from the printing leaf, 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.

9. A product comprising a printed circuit board, characterized in that The inductive element also includes the inductive element according to claim 7 or 8, which is mounted on the printed circuit board and electrically connected with the printed circuit board.

10. The product according to claim 9, wherein The product can be an electrical equipment or a vehicle.

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