Inductor magnetic core and inductor
By introducing a reinforcement layer with a density greater than that of the inner core into the inductor core and smoothly transitioning its end surface with the inner core, the problem of easy damage during the molding process of the inductor core is solved, and the resistance to bumps and overall strength is improved.
Patent Information
- Application Number
- CN202422008955.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-19
- Publication Date
- 2025-07-11
- Estimated Expiration
- 2034-08-19
AI Technical Summary
The existing inductor cores are easily damaged by sharp corners during molding, resulting in poor quality.
The inner core and reinforcement layer structure are adopted, and the inner core extends in the first direction. The reinforcement layer is around the inner core and has a density greater than that of the inner core. The end face of the reinforcement layer is flush or smoothly transitioning with the end face of the inner core to form a density gradient layer to enhance protection.
Improve the anti-bumping ability of the inductor core, reduce damage, and improve quality problems.
Smart Images
Figure CN223092654U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of inductors, and particularly to a magnetic core of an inductor. Background Art
[0002] At present, the magnetic core of an inductor is usually formed by pressing in one piece. The magnetic core of an inductor usually has sharp corners. During the forming process of the inductor, the sharp corners of the magnetic core of the inductor are easily damaged by bumping, and the magnetic core of the inductor needs to be replaced. Therefore, there is a technical problem of poor quality in the current magnetic core of the inductor. Summary of the Utility Model
[0003] This application provides a magnetic core of an inductor, which is used to improve the technical problem that the current magnetic core of the inductor is easily damaged by bumping and has poor quality.
[0004] In addition, the purpose of this application is also to provide an inductor using the above magnetic core of the inductor.
[0005] In a first aspect, in an embodiment, a magnetic core of an inductor is provided. The magnetic core of the inductor includes an inner core body and a strengthening layer. The inner core body extends in a first direction, and the strengthening layer is located outside the inner core body and extends in a circumferential direction perpendicular to the first direction. The density of the strengthening layer is greater than that of the inner core body; in the first direction, the end face of one end of the inner core body is flush with or smoothly transitions to the end face of the strengthening layer.
[0006] Further, in an embodiment, in the first direction, the two ends of the inner core body are respectively a first core body end and a second core body end, and the two ends of the strengthening layer are respectively a first strengthening layer end and a second strengthening layer end; the first core body end and the first strengthening layer end are at the same end of the magnetic core of the inductor. At least a part of the end face of the first strengthening layer end is a strengthening layer slope surface, and the strengthening layer slope surface gradually moves away from the inner core body in the direction from the first strengthening layer end to the second strengthening layer end.
[0007] Further, in an embodiment, the strengthening layer slope surface includes a concave section, a transition section, and a convex section connected in sequence. The convex section is connected to the end face of the inner core body, the convex section is located outside the end face of the inner core body, the transition section is located outside the convex section, and the transition section connects the concave section and the convex section.
[0008] Further, in an embodiment, the end face of the first strengthening layer end further includes a flat section, and the flat section is located outside the concave section and is connected to the concave section.
[0009] Further, in one embodiment, the reinforcing layer includes a first layer, a second layer, a third layer, and a fourth layer. The planar section is the end face of the first layer, the concave section is the end face of the second layer, the transition section is the end face of the third layer, the convex section is the end face of the fourth layer, and the densities of the first layer, the second layer, the third layer, and the fourth layer decrease in sequence.
[0010] Further, in one embodiment, the reinforcing layer includes a density gradient layer. The slope face of the reinforcing layer is the end face of the density gradient layer, and the density of the density gradient layer gradually increases in the direction away from the inner core.
[0011] Further, in one embodiment, the inductor magnetic core is integrally compression molded.
[0012] Further, in one embodiment, the inductor magnetic core has a symmetry plane, and the inductor magnetic core is symmetrically arranged with respect to the symmetry plane, and the symmetry plane is perpendicular to the first direction.
[0013] Further, in one embodiment, the outer peripheral surface of the reinforcing layer includes an arc-shaped corner extending in the first direction, and the arc-shaped corner is smoothly transitioned with the connected side surface; a sharp corner is formed at the intersection of the end face of the reinforcing layer and the outer peripheral surface of the reinforcing layer.
[0014] In a second aspect, in one embodiment, an inductor is provided. The inductor includes a coil and an inductor magnetic core; the inductor magnetic core includes an inner core and a reinforcing layer. The inner core extends in the first direction, and the reinforcing layer is located outside the inner core and extends circumferentially perpendicular to the first direction. The density of the reinforcing layer is greater than the density of the inner core; in the first direction, the end face of one end of the inner core is flush with or smoothly transitioned with the end face of the reinforcing layer.
[0015] Further, in one embodiment, in the first direction, the two ends of the inner core are respectively a first core end and a second core end, and the two ends of the reinforcing layer are respectively a first reinforcing end and a second reinforcing end; the first core end and the first reinforcing end are at the same end of the inductor magnetic core, and at least a part of the end face of the first reinforcing end is a slope face of the reinforcing layer, and the slope face of the reinforcing layer gradually moves away from the inner core in the direction from the first reinforcing end to the second reinforcing end.
[0016] Further, in one embodiment, the slope face of the reinforcing layer includes a concave section, a transition section, and a convex section connected in sequence. The convex section is connected to the end face of the inner core, the convex section is located outside the end face of the inner core, the transition section is located outside the convex section, and the transition section connects the concave section and the convex section.
[0017] Further, in one embodiment, the end face of the first end of the reinforcing layer further includes a planar section, which is located on the periphery of the concave section and is connected to the concave section.
[0018] Further, in one embodiment, the reinforcing layer includes a first layer, a second layer, a third layer, and a fourth layer. The planar section is the end face of the first layer, the concave section is the end face of the second layer, the transition section is the end face of the third layer, and the convex section is the end face of the fourth layer. The densities of the first layer, the second layer, the third layer, and the fourth layer decrease in sequence.
[0019] Further, in one embodiment, the reinforcing layer includes a density gradient layer, and the slope face of the reinforcing layer is the end face of the density gradient layer. The density of the density gradient layer gradually increases in the direction away from the inner core body.
[0020] Further, in one embodiment, the inductor magnetic core is integrally compression molded.
[0021] Further, in one embodiment, the inductor magnetic core has a symmetry plane, and the inductor magnetic core is symmetrically arranged with respect to the symmetry plane, and the symmetry plane is perpendicular to the first direction.
[0022] Further, in one embodiment, the outer peripheral surface of the reinforcing layer includes an arc-shaped corner extending in the first direction, and the arc-shaped corner is smoothly transitioned with the adjacent side surface; a sharp corner is formed at the intersection of the end face of the reinforcing layer and the outer peripheral surface of the reinforcing layer.
[0023] For the inductor magnetic core according to the above embodiment, the reinforcing layer of the inductor magnetic core of the present application is located on the periphery of the inner core body, and the density of the reinforcing layer is greater than that of the inner core body. In this way, the strength of the reinforcing layer can be greater than that of the inner core body. Under the protection of the reinforcing layer, the inductor magnetic core is not easily damaged after being knocked, improving the technical problem that the current inductor magnetic core is easily damaged by knocking and has poor quality. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 is a schematic structural diagram of an inductor magnetic core in one embodiment;
[0025] Figure 2 is a top view of an inductor magnetic core in one embodiment;
[0026] Figure 3 is along Figure 2 the cross-sectional view taken along A-A in
[0027] Figure 4 is Figure 3 the enlarged view of part A in
[0028] List of feature names corresponding to the reference numerals in the figures: 1. Inner core; 11. First end of the core; 12. Second end of the core; 2. Reinforcing layer; 21. First end of the reinforcing layer; 211. Slope of the reinforcing layer; 2111. Concave section; 2112. Transition section; 2113. Convex section; 212. Flat section; 22. Second end of the reinforcing layer; 23. Density gradient layer; 231. First layer; 232. Second layer; 233. Third layer; 234. Fourth layer; 24. Outer peripheral surface; 241. Arc-shaped corner. Detailed implementation manners
[0029] The present application will be further described in detail below in conjunction with the accompanying drawings through specific implementation manners. Similar elements in different implementation manners are labeled with related similar reference numerals. In the following implementation manners, many detailed descriptions are provided to enable a better understanding of the present application. However, those skilled in the art can easily recognize that some of the features can be omitted in different situations, or can be replaced by other elements, materials, or methods. In some cases, some operations related to the present application are not shown or described in the specification to avoid overwhelming the core part of the present application with excessive descriptions. For those skilled in the art, it is not necessary to describe these related operations in detail, and they can fully understand the related operations based on the descriptions in the specification and the general technical knowledge in the art.
[0030] In addition, the features, operations, or characteristics described in the specification can be combined in any appropriate manner to form various implementation manners. At the same time, the steps or actions in the method description can also be reordered or adjusted in an obvious manner by those skilled in the art. Therefore, the various sequences in the specification and the drawings are only for clearly describing a certain embodiment and do not mean that they are the necessary sequences, unless it is stated that a certain sequence must be followed.
[0031] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meanings. And the "connection" and "coupling" mentioned in the present application, unless otherwise specified, both include direct and indirect connection (coupling).
[0032] In one embodiment, please refer to Figures 1 to 4 , the inductor core includes an inner core 1 and a reinforcing layer 2. The inner core 1 extends in a first direction, and the reinforcing layer 2 is located outside the inner core 1 and extends circumferentially perpendicular to the first direction. The density of the reinforcing layer 2 is greater than that of the inner core 1. In the first direction, the end face of one end of the inner core 1 is flush with or smoothly transitions to the end face of the reinforcing layer 2.
[0033] The reinforcing layer 2 of the inductor core of the present application is located on the periphery of the inner core body 1, and the density of the reinforcing layer 2 is greater than that of the inner core body 1, so that the strength of the reinforcing layer 2 can be greater than that of the inner core body 1. Under the protection of the reinforcing layer 2, the inductor core is not easily damaged after being bumped, improving the technical problem that the current inductor core is easily damaged by bumps and has poor quality. The end face of one end of the inner core body 1 is flush with or smoothly transitions to the end face of the reinforcing layer 2, so that the end of the inner core body 1 is not easily damaged after being bumped.
[0034] Further, in an embodiment, please refer to Figure 2 and Figure 3 , in the first direction, the two ends of the inner core body 1 are respectively the core first end 11 and the core second end 12, and the two ends of the reinforcing layer 2 are respectively the reinforcing layer first end 21 and the reinforcing layer second end 22. The core first end 11 and the reinforcing layer first end 21 are at the same end of the inductor core, and the core second end 12 and the reinforcing layer second end 22 are at the same end of the inductor core.
[0035] At least a part of the end face of the reinforcing layer first end 21 is the reinforcing layer slope surface 211, and the reinforcing layer slope surface 211 gradually moves away from the inner core body 1 in the direction from the reinforcing layer first end 21 to the reinforcing layer second end 22.
[0036] Through the reinforcing layer slope surface 211, it is possible to avoid the occurrence of a step between the end face of the reinforcing layer 2 and the end face of the inner core body 1, reduce stress concentration, and facilitate processing.
[0037] In an embodiment, please refer to Figure 3 and Figure 4 , the reinforcing layer 2 includes a density gradient layer 23, the reinforcing layer slope surface 211 is the end face of the density gradient layer 23, and the density of the density gradient layer 23 gradually increases in the direction away from the inner core body 1. This is more convenient for the manufacture of the inductor core, and at the same time, the overall strength of the inductor core is relatively high.
[0038] Of course, in an embodiment, the density of the reinforcing layer 2 may not be gradient, that is, the density at different positions in the reinforcing layer 2 is the same.
[0039] In an embodiment, please refer to Figures 1 to 4 , the structures at both ends of the inductor core are the same, and the structures of the core second end 12 and the reinforcing layer second end 22 will not be elaborated.
[0040] In some other embodiments, in addition to the end face of the core first end 11 being higher than the end face of the reinforcing layer first end 21, the end face of the reinforcing layer first end 21 may also be higher than the end face of the core first end 11. At this time, the reinforcing layer slope surface 211 gradually approaches the inner core body 1 in the direction from the reinforcing layer first end 21 to the reinforcing layer second end 22.
[0041] Further, in an embodiment, please refer toFigure 3 and Figure 4 , the slope surface 211 of the strengthening layer includes a concave section 2111, a transition section 2112, and a convex section 2113 that are connected in sequence. The convex section 2113 is connected to the end face of the inner core body 1, the convex section 2113 is located on the periphery of the end face of the inner core body 1, the transition section 2112 is located on the periphery of the convex section 2113, and the transition section 2112 connects the concave section 2111 and the convex section 2113. In one embodiment, the two adjacent sections among the concave section 2111, the transition section 2112, and the convex section 2113 are smoothly transitioned.
[0042] Further, in one embodiment, please refer to Figure 4 , the end face of the strengthening layer 2 includes a flat section 212, and the flat section 212 is located on the periphery of the concave section 2111. In one embodiment, a sharp angle is formed at the intersection of the end face of the strengthening layer 2 and the outer peripheral surface of the strengthening layer 2. Specifically, the flat section 212 intersects with the outer peripheral surface of the strengthening layer 2 and forms a sharp angle.
[0043] Specifically, in one embodiment, please refer to Figures 3 to 4 , the density gradient layer 23 includes a first layer 231, a second layer 232, a third layer 233, and a fourth layer 234. The flat section 212 is the end face of the first layer 231, the concave section 2111 is the end face of the second layer 232, the transition section 2112 is the end face of the third layer 233, the convex section 2113 is the end face of the fourth layer 234, and the densities of the first layer 231, the second layer 232, the third layer 233, and the fourth layer 234 decrease in sequence, that is, the density of the first layer 231 is greater than the density of the second layer 232, the density of the second layer 232 is greater than the density of the third layer 233, and the density of the third layer 233 is greater than the density of the fourth layer 234.
[0044] In some other embodiments, the slope surface 211 of the strengthening layer may also be directly connected to the outer peripheral surface of the strengthening layer 2, and the slope surface 211 of the strengthening layer gradually moves away from the inner core body 1 in the direction from the first end 21 to the second end 22 of the strengthening layer.
[0045] In one embodiment, please refer to Figure 3 and Figure 4 , the outer peripheral surface 24 of the strengthening layer 2 extends in the first direction, the flat section 212 is perpendicular to the first direction, and the flat section 212 forms a 90-degree angle with the outer peripheral surface 24 of the strengthening layer 2. In some other embodiments, the flat section 212 may also form an 80-degree or 120-degree angle with the outer peripheral surface of the strengthening layer 2.
[0046] Further, in one embodiment, the inductor core is integrally pressed and formed. Specifically, in one embodiment, the forming process of the inductor core is to integrally press and form the reinforcing layer 2 and the inner core body 1 with powder, and then perform heat treatment and infiltration treatment. When pressing and forming the inductor core, more powder is filled in the reinforcing layer 2 so that the density of the formed reinforcing layer 2 is greater than that of the inner core body 1.
[0047] Further, in one embodiment, the inductor core has a symmetry plane, and the inductor core is symmetrically arranged with respect to the symmetry plane, and the symmetry plane is perpendicular to the first direction. The inductor core is a symmetric structure, which is more convenient for processing. In some other embodiments, the inductor core may not be a symmetric structure, and in this case, the inductor core has no symmetry plane.
[0048] Further, in one embodiment, please refer to Figure 2 , the cross-section of the inductor core perpendicular to the first direction is in an E shape. In some other embodiments, the inductor core may also be in a T shape or a long strip shape.
[0049] Further, in one embodiment, please refer to Figure 1 , the outer peripheral surface 24 of the reinforcing layer 2 includes an arc-shaped corner 241 extending in the first direction, and the arc-shaped corner 241 is smoothly transitioned with the connected side surface. The arc-shaped corner 241 is more convenient for processing, has higher strength, and is not easily damaged by bumping.
[0050] In one embodiment of an inductor, the inductor includes a coil and an inductor core as described in any of the above embodiments. The coil is wound around the inductor core. In one embodiment, the inductor is a high-power inductor for a new energy vehicle.
[0051] The above uses specific examples to elaborate on the present application, which is only used to help understand the present application and is not intended to limit the present application. For those skilled in the art of the present application, based on the idea of the present application, several simple deductions, deformations or substitutions can also be made.
Claims
1. An inductor core, characterized in that, The inductor core includes an inner core body and a reinforcing layer. The inner core body extends in a first direction, and the reinforcing layer is disposed around the inner core body and extends in a circumferential direction perpendicular to the first direction. The density of the reinforcing layer is greater than that of the inner core body; in the first direction, the end face of one end of the inner core body is flush with or smoothly transitions to the end face of the reinforcing layer.
2. The inductor core according to claim 1, wherein, In the first direction, the two ends of the inner core body are respectively a first core end and a second core end, and the two ends of the reinforcing layer are respectively a first reinforcing end and a second reinforcing end; the first core end and the first reinforcing end are at the same end of the inductor core. At least a part of the end face of the first reinforcing end is a reinforcing slope surface, and the reinforcing slope surface gradually moves away from the inner core body in the direction from the first reinforcing end to the second reinforcing end.
3. The inductor core according to claim 2, wherein, The reinforcing slope surface includes a concave section, a transition section, and a convex section connected in sequence. The convex section is connected to the end face of the inner core body, the convex section is disposed around the end face of the inner core body, the transition section is disposed around the convex section, and the transition section connects the concave section and the convex section.
4. The inductor core according to claim 3, characterized in that, The end face of the first reinforcing end of the reinforcing layer further includes a flat section, and the flat section is disposed around the concave section and is connected to the concave section.
5. The inductor core according to claim 4, wherein, The reinforcing layer includes a first layer, a second layer, a third layer, and a fourth layer. The flat section is the end face of the first layer, the concave section is the end face of the second layer, the transition section is the end face of the third layer, the convex section is the end face of the fourth layer, and the densities of the first layer, the second layer, the third layer, and the fourth layer decrease in sequence.
6. The inductor core according to claim 2, wherein The reinforcing layer includes a density gradient layer, the reinforcing slope surface is the end face of the density gradient layer, and the density of the density gradient layer gradually increases in the direction away from the inner core body.
7. The inductor core according to any one of claims 1-4, characterized in that, The inductor core is integrally compression molded.
8. The inductor core according to any one of claims 1 to 4, characterized in that, The inductor core has a symmetry plane, and the inductor core is symmetrically arranged with respect to the symmetry plane, and the symmetry plane is perpendicular to the first direction.
9. The inductor core according to any one of claims 1-4, characterized in that, The outer peripheral surface of the reinforcing layer includes an arc-shaped corner extending in the first direction, and the arc-shaped corner smoothly transitions to the adjacent side surface; a sharp corner is formed at the intersection of the end face of the reinforcing layer and the outer peripheral surface of the reinforcing layer.
10. An inductor, characterized in that, The inductor includes a coil and an inductor core according to any one of claims 1-9.