Chinese character'ri '-shaped three-phase dual-common-mode and differential-mode inductor

Abstract

The utility model relates to a divisional application, the original application number is 202420945726.1, the application date is May 6, 2024, and the three-phase common mode inductor is named as a magnetic element and is shaped like a Chinese character'ri '. The technical scheme of the utility model provides a three-phase double common-mode and differential-mode inductor shaped like a Chinese character'ri ', which belongs to the technical field of magnetic elements and inductors, and is characterized in that each magnetic element comprises two strip-shaped structures, two side magnetic columns and a middle magnetic column, the strip-shaped structures are arranged at intervals, the two side magnetic columns and the middle magnetic column are arranged between the strip-shaped structures, and the side magnetic columns are arranged on two sides of the middle magnetic column. Each strip-shaped structure comprises a plurality of strip structures which are arranged in a stacked mode, the strip structures are arranged in a stacked mode in the Z-axis direction, air gaps are reserved between the middle magnetic columns and the strip-shaped structures, magnetic strips are arranged between the side magnetic columns and the middle magnetic columns, and the length of the magnetic strips is smaller than that of the middle magnetic columns. And the sheet structures can form a magnetic flux loop, so that the magnetic flux of the magnetic element is improved.

Description

[0001] This utility model is a divisional application. The original application number is 202420945726.1, the application date is May 6, 2024, and the title is Magnetic Element, "Sun-shaped" Three-phase Common-mode Inductor. Technical Field

[0002] This utility model relates to the technical fields of magnetic elements and inductors, especially inductive cores, three-phase inductors, and multi-groove inductors. Background Art

[0003] Inductors are developing in the direction of being small in volume, low in manufacturing cost, and capable of increasing the magnetic flux of the inductor.

[0004] Chinese Patent (CN220774093U) discloses a three-dimensional structure inductor. Three groups of magnetic columns are arranged between the upper and lower magnetic cores in a similar triangular shape, which is different from the conventional side-by-side parallel distribution structure and has better heat dissipation effect. Summary of the Utility Model

[0005] The main purpose of this utility model is to propose a magnetic element and an inductor used as an inductive core to obtain a larger magnetic flux and a smaller volume.

[0006] According to this utility model, a "sun-shaped" three-phase dual-common differential-mode inductor is proposed. It includes a winding and a magnetic element as the magnetic core. The magnetic element includes two spaced bar-shaped structures, two side magnetic columns and one middle magnetic column arranged between the bar-shaped structures. The side magnetic columns are arranged on both sides of the middle magnetic column. The bar-shaped structure includes multiple stacked strip structures. The strip structures are stacked along the Z-axis direction. There is an air gap between the middle magnetic column and the bar-shaped structure. A magnetic strip is arranged between the side magnetic column and the middle magnetic column. The length of the magnetic strip is less than the length of the middle magnetic column.

[0007] Preferably, the strip structure is a planar structure.

[0008] Preferably, the strip structure is a non-planar structure. The strip structure includes straight sections and bent sections, and the straight sections and the bent sections are arranged alternately. The straight sections correspond to the side magnetic columns and / or the middle magnetic column.

[0009] The utility model technical solution proposes a "Japanese-shaped" three-phase dual common differential mode inductor, wherein the magnetic element includes two strip structures arranged at intervals and two side magnetic columns and one middle magnetic column arranged between the strip structures, the side magnetic columns are arranged on both sides of the middle magnetic column, the strip structure includes a plurality of stacked strip structures, the strip structure is stacked along the Z-axis direction, an air gap is left between the middle magnetic column and the strip structure, a magnetic strip is arranged between the side magnetic column and the middle magnetic column, and the length of the magnetic strip is less than the length of the middle magnetic column. The sheet structures can form a magnetic flux loop to increase the magnetic flux of the magnetic element. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] With reference to the accompanying drawings, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings are only used for illustrative purposes and are not intended to limit the protection scope of the present utility model.

[0011] Figure 1 It is a schematic diagram of the three-dimensional structure of the magnetic element involved in the embodiment of the utility model;

[0012] Figure 2 It is a schematic diagram of a sheet structure of a magnetic element involved in an embodiment of the utility model;

[0013] Figure 3 It is a schematic diagram of the three-dimensional structure of the magnetic element involved in the embodiment of the utility model;

[0014] Figure 4 It is a schematic diagram of a strip structure of a magnetic element involved in an embodiment of the utility model;

[0015] Figure 5 It is a schematic diagram of another strip structure of a magnetic element involved in an embodiment of the utility model;

[0016] Figure 6 It is a schematic plan view of a magnetic element with an air gap according to an embodiment of the utility model;

[0017] Figure 7 It is a schematic plan view of a magnetic element with a magnetic strip according to an embodiment of the utility model;

[0018] Figure 8 It is a schematic diagram of the three-dimensional structure of a three-phase dual common differential mode inductor involved in an embodiment of the utility model;

[0019] Fig. 9 It is a schematic diagram of the three-dimensional structure of a three-phase common-mode inductor involved in an embodiment of the utility model;

[0020] Fig.10 A schematic diagram of the three-dimensional structure of a three-phase single common differential mode inductor according to an embodiment of the utility model;

[0021] Fig.11 A schematic diagram of the three-dimensional structure of a multi-slot inductor according to an embodiment of the present utility model.

[0022] Description of Figure Numbers:

[0023] 10. Magnetic components;

[0024] 11. Ring structure; 111. Sheet structure; 12. Magnetic column; 12a. Air gap; 13. Magnetic strip; 14. Winding;

[0025] 20. Magnetic components;

[0026] 21, strip structure; 21a, side magnetic column; 211, strip structure; 211a, straight section; 211a1, side; 211b, curved section; 22, middle magnetic column;

[0027] 30. Three-phase common mode inductor;

[0028] 40. Three-phase single common differential mode inductor;

[0029] 50. Three-phase dual common differential mode inductor;

[0030] 60. Multi-slot inductor.

[0031] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0033] Magnetic integration: Winding two or more discrete magnetic components on a pair of magnetic cores and integrating them together structurally to reduce the number and volume of magnetic components.

[0034] Decoupling: The windings of each discrete component share a common magnetic core, and there is no magnetic connection between them, which does not affect their respective working conditions.

[0035] Coupling: The windings of each discrete component share a common magnetic core, and there is mutual coupling of magnetic flux between them.

[0036] The present invention provides a magnetic element 10 as a magnetic core. Figure 1As shown, the magnetic element 10 includes an annular structure 11 and a magnetic column 12. The magnetic column 12 is connected inside the annular structure 11. In order to increase the length of the magnetic flux loop and improve the magnetic flux, the annular structure 11 is a rectangular structure, and the magnetic column 12 is perpendicular to the side of the rectangular structure and parallel to the adjacent side of the rectangular structure. Figure 1 As shown, the magnetic column 12 is perpendicular to the long side of the rectangular structure (ring structure 11 ) and parallel to the short side of the rectangular structure (ring structure 11 ).

[0037] For the ring structure 11, see Figure 1 and Figure 2 The annular structure 11 is composed of a plurality of stacked sheet structures 111 , and the sheet structures 111 are stacked along the Z-axis direction. Figure 1 The schematic diagram shows that multiple sheet structures 111 are stacked along the Z-axis direction, the magnetic column 12 contacts each sheet structure, and the magnetic flux passes through all sheet structures 111, thereby increasing the magnetic flux of the magnetic element. In the actual production process, adjacent sheet structures 111 are connected by an insulating layer. The insulating layer includes a glue layer or a shell layer (cushion layer), and the glue layer is formed by spraying, scraping, dipping, etc.

[0038] The sheet structure 111 is a magnetic material with high magnetic permeability, amorphous, nano-chip material, and the sheet structure 111 is stacked to form an annular structure 11. When winding the winding, a protective layer needs to be provided on the outer surface of the annular structure 11. Amorphous, nano-chip material is relatively brittle, so stress concentration is avoided during the winding process to damage the sheet and affect the magnetic flux. The magnetic column 12 is a die-casting structure, including manganese-zinc ferrite material, nickel-zinc ferrite material, permalloy material, iron-silicon-aluminum powder material, etc. The cross-section of the magnetic column is circular, oval or square. The cross-section of the annular structure 11 is rectangular or square, which is convenient for production and processing.

[0039] The amorphous and nanocrystalline chip material structure 111 has a higher cost and a more complicated production process than the amorphous and nanocrystalline strip material structure during the molding process. In another embodiment, the magnetic element 20 includes a strip structure 21 arranged at intervals in the Y-axis direction, and magnetic columns are arranged between the strip structures 21. The magnetic columns are arranged at intervals along the X-axis direction. When there are two magnetic columns, the magnetic element 20 is used to form a two-phase inductor; when there are three magnetic columns, the magnetic element 20 is used to form a three-phase inductor; Figure 3 As shown, the magnetic column includes a side magnetic column 21a and a middle magnetic column 22. The structure and material of the side magnetic column 21a and the middle magnetic column 22 are the same as those described in the above embodiment.

[0040] For strip structure 21, see Figure 3 and Figure 4The strip structure 21 is composed of a plurality of stacked strip structures 211, and the strip structure 211 is stacked along the Z-axis direction. It can be seen that when the strip structure 211 is stacked along the X-axis direction or the Y-axis direction, there are problems of different magnetic circuits or too narrow magnetic flux circuits. Figure 3 The schematic diagram shows that multiple strip structures 211 are stacked along the Z-axis direction, and the side magnetic columns 21a and the middle magnetic columns 22 are in contact with each strip structure 211. The magnetic flux passes through all the strip structures 211, thereby increasing the magnetic flux of the magnetic element. In the actual production process, adjacent strip structures 211 are connected by an insulating layer. The insulating layer includes a glue layer or a shell layer (cushion layer), and the glue layer is formed by spraying, scraping, dipping, etc.

[0041] The strip structure 211 is a magnetic material with high magnetic permeability. The production process of amorphous and nanocrystalline strips is mature, and the thickness and width of the strips are controllable, which is convenient for mass production and processing.

[0042] The strip structure 211 in the above embodiment is a plane. In another embodiment, the strip structure 211 is a non-plane and includes a straight section 211a and a curved section 211b. The straight section 211a and the curved section 211b are arranged alternately. Figure 5 As shown, the strip structure 211 includes three straight sections 211a, and a curved section 211b is provided between two adjacent straight sections 211a, that is, the straight sections 211a at both ends correspond to the positions of the side magnetic columns 21a, and the middle straight section 211a corresponds to the position of the middle magnetic column 22. The edge 211a1 of the straight section 211a is connected to the top surface of the side magnetic column 21a or the middle magnetic column 22, and the straight section 211a is in full contact with the top surface of the side magnetic column 21a or the middle magnetic column 22, thereby reducing the air gap and the leakage magnetic loss. The multiple strip structures 211 are stacked and arranged, and the curved section 211b is provided to increase the length of the magnetic flux loop, improve the magnetic flux of the magnetic element, and adjust the inductance and performance parameters.

[0043] In one embodiment, there is an air gap 12a between the magnetic column 12 and the annular structure 11. Figure 6 As shown, one end of the magnetic column 12 is connected to the side of the rectangular structure (ring structure 11) and is parallel to the adjacent side of the rectangular structure (ring structure 11), and an air gap 12a exists between the other end of the magnetic column 12 and the opposite side of the rectangular structure (ring structure 11). The air gap can increase the leakage inductance, and the leakage inductance of the common mode inductor can be used as a differential mode inductor to filter out differential mode noise, realize integrated design, reduce component volume, and reduce costs.

[0044] In one embodiment, a magnetic strip 13 is provided between the magnetic column 12 and the side parallel to the side of the rectangular structure (ring structure 11), and the length of the magnetic strip 13 is less than the length of the magnetic column 12. When the winding 14 is wound around the magnetic column 12 and the side of the rectangular structure (ring structure 11) parallel to the magnetic column, the magnetic strip 13 generates leakage inductance, thereby improving the effect of the differential mode inductance ( Figure 7 and Figure 8 ).

[0045] The utility model provides a "Japanese-shaped" three-phase common-mode inductor 30, such as Fig. 9 As shown, it includes a magnetic element 10 and a winding 14 . It is known that the magnetic element 10 may also be a magnetic element 20 .

[0046] The utility model provides a "Japanese-shaped" three-phase single common differential mode inductor 40, such as Fig.10 As shown, it includes a magnetic element 10 and a winding 14, and an air gap 12a is left between the magnetic column 12 and the edge of the ring structure 11. It can be known that the magnetic element 10 can also be a magnetic element 20, that is, an air gap is left between the middle magnetic column 22 and the strip structure 21. This structure can obtain stronger anti-saturation performance, increase leakage inductance, and increase differential mode inductance.

[0047] The utility model provides a "Japanese-shaped" three-phase dual common differential mode inductor 50, such as Figure 8 As shown, it includes a magnetic element 10 and a winding 14 , and a magnetic strip 13 is arranged between the winding 14 . It is known that the magnetic element 10 can also be a magnetic element 20 , that is, the magnetic strip 13 is arranged between the side magnetic column 21 a and the middle magnetic column 22 .

[0048] The utility model provides a multi-slot inductor 60, such as Fig.11 As shown, it includes a magnetic element 20 and a winding 14, and the strip structures 21 are arranged at intervals. When the number of strip structures 21 N=3, the strip structures 21 are connected with side magnetic columns 21a, and the winding 14 is wound on the side magnetic columns 21. By setting the winding method (clockwise (counterclockwise)), a common (differential) mode inductor is formed; when N=2, it is a single-slot inductor.

[0049] In one embodiment, the magnetic element 20 includes a middle magnetic column 22 , and windings are wound around the middle magnetic column 22 to obtain a multi-slot multi-phase inductor.

[0050] It should be noted that when the material of the magnetic element in the above embodiment is ferrite material, the magnetic element can be an integrally formed structure through die-casting.

[0051] The winding method of the winding in the above embodiment, such as clockwise winding or counterclockwise winding, and the winding turn ratio are set according to actual needs. In addition, the winding wires of the windings include round wires and flat wires. Flat wires are preferably used because they have a larger surface area and are conducive to heat dissipation under high current conditions. At the same time, the number of winding turns can be increased to obtain a larger inductance.

[0052] In the above embodiment, the air gap and the magnetic strip can also be arranged in the magnetic element 20 .

Claims

1. "Japanese-shaped" three-phase dual common differential mode inductor, characterized in that: The invention comprises a winding (14) and a magnetic element as a magnetic core, wherein the magnetic element comprises two strip structures (21) arranged at intervals, two side magnetic columns (21a) and a middle magnetic column (22) arranged between the strip structures (21), wherein the side magnetic columns (21a) are arranged on both sides of the middle magnetic column (22), the strip structure (21) comprises a plurality of stacked strip structures (211), wherein the strip structures (211) are stacked along the Z-axis direction, an air gap is left between the middle magnetic column (22) and the strip structure (21), a magnetic strip is arranged between the side magnetic column (21a) and the middle magnetic column (22), and the length of the magnetic strip is less than the length of the middle magnetic column (22).

2. The "Japanese-shaped" three-phase dual common differential mode inductor according to claim 1 is characterized in that: The strip structure (211) is a planar structure.

3. The "Japanese-shaped" three-phase dual common differential mode inductor according to claim 2 is characterized in that: The strip structure (211) is a non-planar structure, comprising a straight section (211a) and a curved section (211b), wherein the straight section (211a) and the curved section (211b) are arranged alternately, and the straight section (211a) corresponds to the side magnetic column (21a) and / or the middle magnetic column (22).

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