Vertical three-phase common mode inductor
By adopting a triangular toroidal magnetic core and an insulating support design, the problems of low winding efficiency and magnetic circuit asymmetry in traditional vertical three-phase common-mode inductors are solved, realizing automated winding and magnetic circuit optimization, and improving the performance and space utilization of the inductor.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-15
- Publication Date
- 2026-03-27
AI Technical Summary
Traditional vertical three-phase common-mode inductors have low winding efficiency, high cost, and are difficult to adapt to automated production. The saturation of the inner diameter of the toroidal core leads to high volume redundancy, and the toroidal structure limits mass production efficiency.
It adopts a triangular toroidal core design, including a straight section core and coils. The three-phase magnetic flux paths are separated by physical structure. Combined with an insulating bracket and adhesive connection, it realizes automated winding and optimized magnetic circuit efficiency.
It improves winding efficiency, reduces the use of magnetic core material, optimizes space utilization, and enhances the performance and reliability of three-phase common-mode inductors.
Smart Images
Figure CN224052979U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of inductance element, especially relates to a vertical three-phase common mode inductor. BACKGROUND
[0002] The vertical three-phase common mode inductor is a core element for suppressing common mode noise in a three-phase power system, and a traditional scheme generally adopts a circular ring-shaped magnetic core for manually winding a coil. The typical structure includes a circular magnetic ring, a three-phase winding, and a fixed substrate, and relies on a symmetrical magnetic circuit to achieve noise filtering. However, the circular design requires manual winding, which is low in efficiency and poor in consistency. With the increasing demand for device miniaturization and automated production, the defects of such structure in cost, efficiency, and reliability are increasingly prominent.
[0003] In the prior art, the ring-shaped magnetic core needs to be threaded by hand with a crochet needle, which has significant limitations. First, manual winding is slow and cannot adapt to automated production lines. Second, the inner diameter of the circular ring-shaped magnetic core is saturated, resulting in effective magnetic circuit loss and high volume redundancy. In addition, the ring-shaped structure limits the clamping and positioning of the winding machine, restricting mass production efficiency. SUMMARY
[0004] The utility model aims to provide a three-phase common mode inductor to improve the performance and winding efficiency of the three-phase common mode inductor.
[0005] To achieve this purpose, the utility model adopts the following technical solutions:
[0006] A vertical three-phase common mode inductor includes a triangular ring-shaped magnetic core, a coil, and a substrate.
[0007] The triangular ring-shaped magnetic core includes first, second, and third straight section magnetic cores, all of which are straight sections.
[0008] The first, second, and third straight section magnetic cores are respectively wound with the coil. The coil is electrically connected to the substrate, and the third straight section magnetic core is glued to the substrate.
[0009] In an embodiment, the first, second, and third straight section magnetic cores, when extended, form an equilateral triangle.
[0010] In an embodiment, the third straight section magnetic core is also symmetrically formed with at least two protrusions, and the protrusions avoid the coil. When the third straight section magnetic core is glued to the substrate, the protrusions form a gap of a predetermined height between the third straight section magnetic core and the substrate.
[0011] In an embodiment, the three rounded corner portions of the triangular ring-shaped magnetic core are formed with three outer circular arc structures concentric with the center of the triangular ring-shaped magnetic core.
[0012] In an embodiment, an insulating support is further included, which comprises a back plate and three partitions, each of which is arranged perpendicularly to the back plate and distributed radially; the partitions are used to insulate and separate the coils wound around the first straight magnetic core, the second straight magnetic core and the third straight magnetic core respectively, and the area of the back plate is greater than the hollow area of the triangular ring-shaped magnetic core.
[0013] In an embodiment, the shape of the back plate is similar to that of the triangular ring-shaped magnetic core.
[0014] In an embodiment, the back plate is further formed with a foolproof structure.
[0015] In an embodiment, the back plate is further formed with a glue groove, which is used for glue dispensing to fixedly connect the back plate with the coils or the triangular ring-shaped magnetic core.
[0016] Compared with the prior art, the utility model has the following beneficial effects:
[0017] In the embodiment of the utility model, the triangular straight section type arrangement of the first straight magnetic core, the second straight magnetic core and the third straight magnetic core separates three-phase magnetic flux paths through physical structure, reduces the superposition area of the magnetic field, avoids excessive concentration of the cross-sectional local magnetic field, thereby reducing the risk of magnetic circuit saturation of the cross section of the triangular ring-shaped magnetic core, improving the utilization rate of the magnetic field strength of the unit magnetic core cross section, thereby compared with the circular ring-shaped magnetic core, the circular ring-shaped magnetic core is overall symmetrical, but the coil distribution is easy to be unbalanced, the magnetic circuit is asymmetrical, and the magnetic field loss is large, the triangular ring-shaped magnetic core of the embodiment reduces the cross-sectional area and volume of the magnetic core while optimizing the magnetic circuit efficiency and improving the performance of the three-phase common mode inductor.
[0018] Further, the first straight magnetic core, the second straight magnetic core and the third straight magnetic core of the embodiment are all arranged in the form of straight section magnetic core, which can be positioned with the aid of a winding jig, thereby realizing automatic winding and improving the winding efficiency of the vertical three-phase common mode inductor. BRIEF DESCRIPTION OF DRAWINGS
[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.
[0020] The structures, proportions, sizes, etc. shown in the drawings of the present application are only used to cooperate with the content disclosed in the specification, so that those skilled in the art can understand and read, and are not used to limit the implementation conditions of the present application, so they do not have technical significance. Any modification of structure, change of proportion relationship or adjustment of size, without affecting the effects and purposes that can be achieved by the present application, should still fall within the scope of the technical content disclosed by the present application.
[0021] Figure 1 is a schematic diagram of a prior art structure;
[0022] Figure 2 is a schematic diagram of an embodiment of the vertical three-phase common-mode inductor of the present application;
[0023] Figure 3 is a schematic diagram of another embodiment of the vertical three-phase common-mode inductor of the present application;
[0024] Figure 4 is a schematic diagram of an embodiment of part of the structure of the present application;
[0025] Figure 5 is a schematic diagram of another embodiment of the vertical three-phase common-mode inductor of the present application;
[0026] Figure 6 is a schematic diagram of an embodiment of part of the structure of the present application; Figure 5
[0027] Illustration: 100, vertical three-phase common-mode inductor;
[0028] 110, triangular ring magnetic core; 111, first straight magnetic core; 112, second straight magnetic core; 113, third straight magnetic core; 113a, protruding part; 114, outer circular arc structure;
[0029] 120, coil; 130, substrate; 140, insulating support; 141, back plate; 141a, foolproof structure; 141b, glue groove; 142, partition plate. DETAILED DESCRIPTION
[0030] To make the technical objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0031] In the description of this utility model, it should be understood that the terms "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be a component centrally located at the same time.
[0032] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.
[0033] This utility model embodiment provides a vertical three-phase common mode inductor 100.
[0034] Please see Figures 1 to 6 In an embodiment of this utility model, the vertical three-phase common mode inductor 100 includes a triangular ring magnetic core 110, a coil 120, and a substrate 130.
[0035] The triangular ring magnetic core 110 includes a first straight-segment magnetic core 111, a second straight-segment magnetic core 112, and a third straight-segment magnetic core 113, all of which are straight segments.
[0036] The first straight magnetic core 111, the second straight magnetic core 112, and the third straight magnetic core 113 are respectively wound with the coil 120; the coil 120 is electrically connected to the substrate 130, and the third straight magnetic core 113 is glued to the substrate 130.
[0037] It can be understood that, in the embodiment of the utility model, the triangular straight section type of the first straight section magnetic core 111, the second straight section magnetic core 112 and the third straight section magnetic core 113 separates three-phase magnetic flux paths through physical structure, reduces the superposition area of the magnetic field, avoids the excessive concentration of the cross-section local magnetic field, thereby reducing the risk of magnetic circuit saturation of the cross section of the triangular ring magnetic core 110, improving the utilization rate of the magnetic field strength of the unit magnetic core cross section, so that compared with the circular ring magnetic core, the circular ring magnetic core is overall symmetrical, but the coil distribution is easy to be unbalanced, the magnetic circuit is asymmetrical, and the magnetic field loss is large, the triangular ring magnetic core 110 of the embodiment reduces the magnetic core cross section area and volume while optimizing the magnetic circuit efficiency, and improves the performance of the three-phase common mode inductor.
[0038] Further, the first straight section magnetic core 111, the second straight section magnetic core 112 and the third straight section magnetic core 113 of the embodiment are all straight section magnetic cores, which can be assisted and positioned by a winding jig, thereby realizing automatic winding and improving the winding efficiency of the vertical three-phase common mode inductor 100.
[0039] In specific embodiments, the material of the triangular ring magnetic core 110 is a magnetic material such as ferrite or amorphous alloy.
[0040] Optionally, the coil 120 is a copper wire or an enameled wire; the substrate 130 is an FR4 epoxy resin board or an aluminum substrate 130 or a ceramic substrate 130. The third straight section magnetic core 113 and the substrate 130 are glued and fixed by using epoxy structural adhesive.
[0041] Please refer to Figure 2 In specific embodiments, the overall structure of the first straight section magnetic core 111, the second straight section magnetic core 112 and the third straight section magnetic core 113 after extension can form an equilateral triangle.
[0042] It can be understood that the equilateral triangle arrangement fundamentally solves the problems of complex winding path and unbalanced three-phase magnetic field caused by geometric asymmetry of the traditional ring magnetic core.
[0043] Please refer to Figure 4 In a preferred embodiment, the third straight section magnetic core 113 also symmetrically forms at least two protruding portions 113a, and the protruding portions 113a avoid the arrangement of the coil 120; when the third straight section magnetic core 113 and the substrate 130 are glued and connected, the protruding portions 113a can form a gap of a preset height between the third straight section magnetic core 113 and the substrate 130.
[0044] Specifically, the protrusion 113a is integrally formed with the third straight magnetic core 113. The protrusion 113a is located at both ends of the contact surface between the third straight magnetic core 113 and the substrate 130. The protrusion 113a contacts and supports the upper surface of the substrate 130, so that a continuous air channel gap is formed between the middle region of the magnetic core and the substrate 130 due to the lifting of the protrusion 113a. This air channel gap is used to fill the structural adhesive, thereby improving the bonding strength between the substrate 130 and the coil 120 or the third straight magnetic core 113, and reducing the thermal expansion stress during the adhesive curing process to avoid bonding failure.
[0045] Furthermore, such as Figure 3 As shown, in a preferred embodiment, to further reduce the volume of the triangular ring magnetic core 110, the three rounded corner portions of the triangular ring magnetic core 110 are formed with three outer circular arc structures 114 concentric with the center of the triangular ring magnetic core 110.
[0046] Please see Figure 4 , Figure 5 and Figure 6 In this embodiment of the present invention, the vertical three-phase common-mode inductor 100 further includes an insulating support 140. The insulating support 140 includes a back plate 141 and three partitions 142. The partitions 142 are all arranged perpendicular to the back plate 141 and are radially distributed. The partitions 142 are used to insulatingly separate adjacent coils 120 that are respectively wound around the first straight magnetic core 111, the second straight magnetic core 112 and the third straight magnetic core 113. The area of the back plate 141 is larger than the hollow area of the triangular ring magnetic core 110.
[0047] It is understood that the insulating support 140 is typically a 3D printed part, the partition 142 is used to achieve insulation between adjacent coils 120, and the back plate 141 is used to facilitate the installation of the insulating support 140. The back plate 141 and the radial partition 142 are designed to specifically solve the problems of inter-turn short circuits and creepage failures caused by physical contact in the three-phase coils 120 of traditional three-phase common-mode inductors. Compared with the partition 142 without the back plate 141, the back plate 141 structure improves the installation efficiency of the partition 142, and the back plate 141 ensures the mechanical strength of the partition 142.
[0048] Furthermore, the shape of the back plate 141 is similar to that of the triangular ring magnetic core 110.
[0049] It is understandable that when the shape of the back plate 141 is similar to that of the triangular ring magnetic core 110, the installation efficiency of the partition 142 can be further improved.
[0050] Optionally, such as Figure 5 or Figure 6As shown, when the back plate 141 is an equilateral triangle structure, the back plate 141 is further formed with a fool-proof structure 141a, thereby realizing fool-proof installation of the partition plate 142.
[0051] In a specific embodiment, please continue to refer to Figure 5 and Figure 6 In order to improve the reliability of the installation of the partition plate 142, the back plate 141 is further formed with a glue groove 141b, which is used for dispensing glue to fix the back plate 141 and the coil 120 or the triangular ring-shaped magnetic core 110.
[0052] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.
Claims
1. A vertical three-phase common-mode inductor, characterized by, The triangular annular magnetic core, the coil and the substrate are included; The triangular annular magnetic core includes a first straight magnetic core, a second straight magnetic core and a third straight magnetic core which are all straight sections; The first straight magnetic core, the second straight magnetic core and the third straight magnetic core are respectively wound with the coil; the coil is conductively connected with the substrate, and the third straight magnetic core is adhesively connected with the substrate.
2. The vertical three-phase common-mode inductor of claim 1, wherein, The overall structure of the first straight magnetic core, the second straight magnetic core and the third straight magnetic core after elongation can form an equilateral triangle.
3. The vertical three-phase common-mode inductor of claim 2, wherein, The third straight magnetic core is further symmetrically formed with at least two protruding portions which avoid the coil; when the third straight magnetic core is adhesively connected with the substrate, the protruding portions can make the third straight magnetic core and the substrate form a gap with a preset height.
4. The vertical three-phase common-mode inductor of claim 2, wherein, Three rounded corner portions of the triangular annular magnetic core are formed with three outer circular arc structures which are concentric with the center of the triangular annular magnetic core.
5. The vertical three-phase common-mode inductor according to any one of claims 1 to 4, characterized in that Further included is an insulating support which includes a back plate and three partition plates which are all perpendicularly arranged with the back plate and radially distributed; the partition plates are used for insulatingly separating the coils which are respectively wound on the first straight magnetic core, the second straight magnetic core and the third straight magnetic core, and the area of the back plate is greater than the hollow area of the triangular annular magnetic core.
6. The vertical three-phase common-mode inductor of claim 5, wherein, The shape of the back plate is similar to the shape of the triangular annular magnetic core.
7. The vertical three-phase common-mode inductor of claim 6, wherein, The back plate is further formed with a foolproof structure.
8. The vertical three-phase common-mode inductor of claim 6, wherein, The back plate is further formed with a glue groove which is used for dispensing glue to fixedly connect the back plate with the coil or the triangular annular magnetic core.