An inductor

Abstract

The present invention discloses an inductor comprising a magnetic core and a coil. The coil is wound around a portion of the magnetic core, and a gap is provided between the core and the coil in another portion. By providing a gap between the magnetic core and the coil, the coil's interception of leakage flux from the core is reduced, eddy current losses in the coil are reduced, and the inductance of the inductor is increased.

Description

Technical Field

[0001] The present invention belongs to the field of inductance, and in particular relates to an inductor. Background Art

[0002] An inductor is a component that can convert electrical energy into magnetic energy and store it. It is widely used in various circuit structures. An inductor is generally composed of a skeleton, a magnetic core, and a coil. The magnetic core is a high-frequency magnetic material with high magnetic permeability and high magnetic flux density.

[0003] Among them, a winding part is provided on the skeleton, and a hollow channel is provided on the winding part along the axial direction. The coil is wound on the winding part, and at least part of the magnetic core is inserted into the hollow channel. An air gap is opened on the part of the magnetic core, and there is leakage magnetic flux in the air gap of the part of the magnetic core. The way of inserting the magnetic core into the hollow channel is that the outer surface of the magnetic core is tightly fitted with the inner surface of the hollow channel, which increases the cutting between the coil and the leakage magnetic flux formed on the magnetic core, resulting in eddy current loss in the coil and reducing the inductance of the inductor. Summary of the Invention

[0004] The first technical problem to be solved by the present invention is to overcome the deficiencies in the prior art and provide an inductor to increase the distance between the magnetic core and the coil, reduce coil loss, and increase inductance.

[0005] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is:

[0006] The invention provides an inductor, comprising a magnetic core and a coil wound on the outer wall of the magnetic core, wherein a distance is provided between a part of the outer wall of the magnetic core and the coil.

[0007] Furthermore, an insulating structure is provided on at least a portion of the magnetic core, and the coil is wound on the insulating structure.

[0008] Furthermore, the insulating structure includes a skeleton having a winding portion for winding the coil, a hollow channel being provided axially in the winding portion, a magnetic core being provided on the skeleton, and at least a portion of the magnetic core being axially inserted into the hollow channel, and a spacing being provided between a portion of the magnetic core and the hollow channel.

[0009] Furthermore, two magnetic columns are provided on opposite sides of the magnetic core, and a middle magnetic column is provided on the magnetic core between the two magnetic columns. The middle magnetic column is inserted into the hollow channel, and a distance is provided between the middle magnetic column and the hollow channel.

[0010] The magnetic core includes two sub-cores, each sub-core including an outer ring magnetic core and a middle column arranged inside the outer ring magnetic core; the two outer ring magnetic cores are opposite and in contact with each other to form two magnetic columns, and the two middle columns are opposite and spaced apart and inserted into the hollow channel to form an intermediate magnetic column and an air gap.

[0011] Furthermore, the two sub-magnetic cores have the same size and are both E-shaped. The outer ring magnetic core includes two sub-magnetic columns arranged on both sides of the middle column, and a connecting magnetic column connecting the two sub-magnetic columns. The middle column is inserted into the hollow channel. One side wall of the winding part is clamped between one sub-magnetic column and the middle column and abuts against the connecting magnetic column, and its opposite side wall is clamped between the other sub-magnetic column and the middle column and abuts against the connecting magnetic column.

[0012] Furthermore, the middle column is a rectangular column, and the distances between the upper and lower end faces of the middle column and the hollow channel are equal, and the distances between the left and right end faces of the middle column and the hollow channel are equal.

[0013] Furthermore, first protrusions axially extending relative to the winding portion are provided on opposite sides of the top of the winding portion, second protrusions axially extending relative to the winding portion are provided on opposite sides of the bottom of the winding portion, and part of the connecting magnetic column is clamped between the first protrusion and the second protrusion.

[0014] Furthermore, the left and right sides of the first protrusion radially extend relative to the winding portion to form two first extension portions, and the left and right sides of the second protrusion radially extend relative to the winding portion to form two second extension portions, and the sub-magnetic column and the remaining connecting magnetic columns are clamped between the first extension portion and the second extension portion.

[0015] Furthermore, the two first protrusions radially protrude relative to the winding part to form a first groove body, the two second protrusions radially protrude relative to the winding part to form a second groove body, and the winding part located between the first protrusions and the second protrusions is provided with four third protrusions radially protruding relative to the winding part, and a third groove body is formed between the two opposing third protrusions, and each groove body is connected in sequence to form a continuous limiting groove.

[0016] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art.

[0017] 1. By setting a distance between part of the magnetic core and the coil, the coil can be kept away from the leakage flux of the magnetic core, minimizing the cutting of the leakage flux of the magnetic core by the coil as much as possible, reducing the eddy current loss of the coil and increasing the inductance of the inductor.

[0018] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, as part of this disclosure, are intended to provide a further understanding of the disclosure. The exemplary embodiments of the disclosure and their descriptions are intended to explain the disclosure and do not constitute undue limitations thereon. Obviously, the drawings described below are merely examples, and those skilled in the art can derive other drawings based on these drawings without inventive effort.

[0020] Figure 1is a schematic structural diagram of an inductor provided in an embodiment of the present invention;

[0021] Figure 2 is a cross-sectional view of an inductor provided by an embodiment of the present invention;

[0022] Figure 3 is a schematic structural diagram of a skeleton provided by an embodiment of the present invention;

[0023] Figure 4 is a structural schematic diagram of a magnetic core structure provided by one embodiment of the present invention;

[0024] Figure 5 Schematic diagram of the distribution of main magnetic flux and leakage magnetic flux on a magnetic core structure provided by one embodiment of the present invention;

[0025] Figure 6 is a structural schematic diagram of a magnetic core structure provided by another embodiment of the present invention;

[0026] Figure 7 It is a structural schematic diagram of a magnetic core structure with an insulating member inserted in an air gap provided by an embodiment of the present invention.

[0027] In the figure: 1-skeleton; 11-winding part; 111-hollow channel; 12-coil pin; 2-magnetic core; 21-sub-magnetic core; 211-outer ring magnetic core; 212-middle column; 22-magnetic column; 23-middle magnetic column; 231-sub-middle magnetic column; 3-spacing; 31-first spacing; 32-second spacing; 4-first protrusion; 41-first extension; 5-second protrusion; 51-second extension; 6-limiting groove; 7-air gap; 71-middle air gap; 72-side air gap; 8-insulating member; 81-first plastic sheet; 9-heat sink; 91-glue layer.

[0028] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0030] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0031] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; and direct or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0032] Example

[0033] like Figure 1 as well as Figure 2 As shown, the present invention provides an inductor, comprising a magnetic core 2 and a coil, wherein the coil is wound around at least a portion of the magnetic core 2, and a distance is provided between at least a portion of the magnetic core 2 and the coil.

[0034] In the embodiment of the present invention, a gap is provided between part of the magnetic core 2 and the coil so that the coil can be away from the leakage flux of the magnetic core, thereby minimizing the amount of the coil cutting the leakage flux of the magnetic core 2, reducing the eddy current loss of the coil, and improving the inductance of the inductor. The number of coil turns is not increased or a more expensive magnetic core is used to reduce the eddy current loss of the coil, thereby reducing costs.

[0035] It should be noted that if Figure 5 As shown, Figure 5 The magnetic core structure of the embodiment of the present invention is Figure 5 The figure shows the distribution of the main magnetic flux and leakage magnetic flux on the magnetic core structure. The magnetic core structure includes a magnetic core and a coil mounted on a portion of the magnetic core. An air gap is provided on the portion of the magnetic core. When the coil is energized, current flows through the coil. When current flows through the coil, a magnetic field is formed in the space around the coil. Since the magnetic core has better magnetic conductivity than air, most of the magnetic flux forms a loop along the magnetic core and the air gap. This part of the magnetic flux becomes the main magnetic flux. Another part of the magnetic flux does not pass through the air gap, but forms its own loop through the air. This part becomes the leakage magnetic flux.

[0036] In an embodiment of the present invention, an insulating structure is provided on at least part of the magnetic core, and the coil is wound on the insulating structure. The insulating structure has a certain thickness and has no effect on cutting. The insulating structure allows at least part of the coil to be spaced from the magnetic core.

[0037] like Figure 1 as well as Figure 2 As shown, in an embodiment of the present invention, the insulating structure includes a skeleton 1, the skeleton 1 has a winding portion 11 for winding a coil, a hollow channel 111 is axially provided in the winding portion 11, a magnetic core 2 is provided on the skeleton 1, and at least part of the magnetic core 2 is axially inserted into the hollow channel 111, and a spacing 3 is provided between part of the magnetic core 2 and the hollow channel 111.

[0038] In the embodiment of the present invention, an air gap 7 is provided on at least a portion of the magnetic core 2. At least a portion of the magnetic core 2 is axially inserted into the hollow channel 111. A gap 3 is provided between the outer wall of at least the portion of the magnetic core inserted into the hollow channel 111 and the inner wall of the hollow channel 111. This gap 3 reduces the amount of leakage flux from the coil to the magnetic core, thereby reducing eddy current losses in the coil and thereby increasing the inductance while maintaining the same number of coil turns. Furthermore, while increasing the inductance, the number of coil turns remains unchanged, thereby reducing production costs.

[0039] It should be noted that a spacing 3 is provided between at least part of the magnetic core and the hollow channel 111. The spacing 3 refers to the distance between each part of the partial magnetic core 2 and the inner wall of the relative hollow channel 111. There is a distance between at least one part of the partial magnetic core 2 and the inner wall of the hollow channel 111.

[0040] In the embodiment of the present invention, two magnetic columns 22 are provided on opposite sides of the magnetic core 2, and an intermediate magnetic column 23 is provided on the magnetic core between the two magnetic columns 22. The intermediate magnetic column 23 is inserted into the hollow channel 111, and a gap 3 is provided between the intermediate magnetic column 23 and the hollow channel 111.

[0041] In the embodiment of the present invention, Figure 4 As shown, an intermediate magnetic column 23 is provided in the middle of the magnetic core 2. The intermediate magnetic column 23 is inserted into the hollow channel 111. An air gap 7 is provided on the intermediate magnetic column 23. Therefore, when the intermediate magnetic column 23 with the air gap 7 is inserted into the hollow channel 111, a gap 3 is provided between the intermediate magnetic column 23 and the inner wall of the hollow channel 111. This ensures that a gap is provided between the air gap provided on the intermediate magnetic column 23 and the hollow channel 111, thereby keeping the leakage magnetic flux away from the coil, thereby reducing the cutting of the leakage magnetic flux of the magnetic core by the coil.

[0042] There is an air gap on the middle magnetic column, or at least two air gaps are provided on the middle magnetic column. The width of the air gap 7 generally refers to the size of the air gap in the axial direction of the middle magnetic column 23; Figure 6As shown, when at least two air gaps are provided on the middle magnetic column 23, the sum of the widths of the at least two air gaps is equal to the width of the air gap when one air gap is provided on the magnetic core. The at least two air gaps are spaced apart along the axial direction of the middle magnetic column 23. A plurality of air gaps 7 are provided on the middle magnetic column 23 to reduce the relative width of the air gap 7, thereby reducing the leakage flux and thus reducing the magnetic loss of the magnetic core structure. Moreover, since the leakage flux is reduced, the cutting of the leakage flux of the magnetic core by the coil can be reduced, and the eddy current loss of the coil can be reduced, thereby achieving the purpose of increasing the inductance under the condition of the same number of coil turns. Moreover, on the basis of the purpose of increasing the inductance, the material of the magnetic core is not changed, thereby reducing the production cost.

[0043] like Figure 1 and Figure 2 As shown, in an embodiment of the present invention, the magnetic core 2 includes two sub-cores 21, and the sub-cores 21 include an outer ring magnetic core 211 and a middle column 212 arranged on the inner side of the outer ring magnetic core 211; the two outer ring magnetic cores 211 are opposite and in contact with each other to form two magnetic columns, and the two middle columns 212 are opposite and inserted into the hollow channel 111 at intervals to form an intermediate magnetic column and an air gap.

[0044] In an embodiment of the present invention, two sub-magnetic cores 21 are arranged opposite to each other to form a magnetic core 2; specifically, one side of the outer ring magnetic core is open, and the outer ring magnetic core is annular, which can be circular or square. The two outer ring magnetic cores 211 are opposite to and in contact with each other to form an outer frame of the magnetic core, and the outer frame of the magnetic core includes two magnetic columns 22; the outer ring magnetic core 211 is annular, so that the outer ring magnetic core 211 has an inner side and an outer side, and the middle column 212 is arranged on the inner side of the outer ring magnetic core 211 and extends toward the open side of the outer ring magnetic core 211. The two middle columns 212 are opposite to each other and spaced apart to form an intermediate magnetic column. An air gap in the intermediate magnetic column is formed between the axial end surfaces of the two middle columns 212, and other air gaps are respectively opened on the two middle columns 212;

[0045] like Figure 7 As shown, further, the middle magnetic column 23 is divided into a plurality of sub-middle magnetic columns 231 by a plurality of air gaps, and an insulating member 8 is provided in each air gap to realize the connection between two adjacent sub-middle magnetic columns 23;

[0046] The insulating member 8 is a first plastic sheet 81. The area of the side surface of the first plastic sheet 81 can be smaller than the area of the axial end surface of the sub-intermediate magnetic column 231, or can be equal to the area of the axial end surface of the intermediate magnetic column, as long as it ensures that the two adjacent sub-intermediate magnetic columns 231 can be connected. Preferably, the area of the side surface of the first plastic sheet 81 is equal to the area of the axial end surface of the intermediate magnetic column, thereby increasing the connection strength between the two adjacent sub-intermediate magnetic columns 231.

[0047] In addition, a second plastic sheet extending along the axial direction of the middle magnetic column is provided on the middle magnetic column. The second plastic sheet is arranged in contact with the middle magnetic column. Each first plastic sheet is vertically connected to the second plastic sheet. All first plastic sheets are arranged on the same side of the second plastic sheet. The second plastic sheet integrates several first plastic sheets 81 to avoid the situation where several first plastic sheets 81 are easily lost, and several first plastic sheets 81 can be inserted into their corresponding air gaps at the same time, thereby improving insertion efficiency.

[0048] Furthermore, heat sinks 9 are provided on opposite sides of the first plastic sheet 81. One side of the heat sink 9 is connected to the axial end face of the sub-intermediate magnetic column 231, and the other side is connected to one side of the first plastic sheet 81. The setting of the heat sink 9 enables the first plastic sheet 81 to be connected to the sub-intermediate magnetic column 231, thereby realizing the connection between two adjacent sub-intermediate magnetic columns 231. At the same time, the heat sink 9 can reduce the temperature of the magnetic core, facilitate heat dissipation, and further improve the saturation value. The heat sink 9 is a glue layer 91 that sticks the first plastic sheet 81 to the axial end faces of the two sub-intermediate magnetic columns 231.

[0049] Specifically, the two sub-magnetic cores are of the same size and are both E-shaped. The outer ring magnetic core 211 includes two sub-magnetic columns arranged on both sides of the center column 212, and a connecting magnetic column connecting the two sub-magnetic columns. The two sub-magnetic columns and the center column 212 are perpendicular to the connecting magnetic column. The center column 212 is inserted into the hollow channel 111. One side wall of the winding portion 11 is clamped between one sub-magnetic column and the center column 212 and abuts against the connecting magnetic column. The opposite side wall is clamped between the other sub-magnetic column and the center column 212 and abuts against the connecting magnetic column.

[0050] The two sub-cores 21 are both E-shaped, wherein the length of the middle column 212 of the sub-core 21 is smaller than the length of the sub-magnetic columns, so that when the outer ring cores 211 are opposite and in contact, an air gap can be formed between the two middle columns 212;

[0051] The two sub-cores are of the same size and are both E-shaped. The two center legs 212 are opposed to each other and spaced apart to form an air gap in the middle of the middle magnetic leg, which is referred to as the middle air gap 71. The air gaps in other positions of the middle magnetic leg are referred to as side air gaps 72. The width of the side air gaps 72 is less than or equal to the width of the middle air gap 71, and the spacing between the air gaps is equal.

[0052] As a preferred technical solution, the width of the side air gap 72 is smaller than the width of the middle air gap 71, so as to avoid the situation where the side air gap 72 is too wide and close to both sides of the magnetic core 2, thereby causing increased damage to the magnetic core 2.

[0053] In the embodiment of the present invention, the middle magnetic column 23 is a rectangular column, and the distances between the upper and lower end surfaces of the middle column and the hollow channel are equal, and the distances between the left and right end surfaces of the middle column and the hollow channel are equal.

[0054] In an embodiment of the present invention, the intermediate magnetic column 23 is a square column. Specifically, the intermediate magnetic column 23 is in the shape of a rectangular parallelepiped, so that the middle column has upper and lower end faces, left and right end faces, and front and rear end faces, and each end face is a horizontal plane; due to the different shapes of the hollow channel 111 and the different plug-in methods of the intermediate magnetic column 23, a first spacing 31 is provided between the upper and lower end faces of the intermediate magnetic column 23 and the inner wall of the hollow channel 111, and a second spacing 32 is provided between the left and right end faces of the intermediate magnetic column 23 and the inner wall of the hollow channel 111; the two first spacings 31 can be equal or unequal, and the two second spacings 32 can be equal or unequal. Preferably, the two first spacings 31 are equal, and the two second spacings 32 are equal, thereby greatly reducing the cutting of the leakage magnetic flux of the magnetic core 2 by the coil.

[0055] The inductor satisfies the following equation:

[0056] K=r 2 / (r+0.29*δ / π) 2 ;

[0057] γ=d / δ;

[0058] M=K*γ 1 / 2 ;

[0059] Where r is the radius of the core, δ is the width of the air gap, d is the distance between the coil and the core, K is the conversion factor of the magnetic flux of the core, γ is the conversion factor of the edge flux loss, and M is the effective conversion factor of the magnetic flux;

[0060] There are at least n air gaps on the magnetic core, and the width of each air gap is δ1, δ2...δn, so δ1+δ2+...+δn=δ; among them, the larger the M value, the larger the effective magnetic flux, and thus the larger the inductance.

[0061] It should be noted that, in the embodiment of the present invention, the coil is equivalent to being mounted on the middle magnetic column, and n air gaps are provided on the middle magnetic column. d can be considered as the average distance between the middle magnetic column and the hollow channel.

[0062] The inductor designed using the above relationship has lower inductor losses when δ and d are changed. The resulting increase in the effective value of the inductor magnetic flux φ means that with the same number of coil turns, the inductance L is greater. This can also be understood as the same inductance L can be achieved with a lower number of turns than the normal inductor coil, while keeping other inductor parameters unchanged.

[0063] It is understandable that increasing the d value will inevitably lead to a reduction in the eddy current loss of the coil.

[0064] The magnetic core includes two E-shaped sub-cores of the same size. A magnetic core with a radius of r = 5 mm is used, wherein the width of the middle magnetic column is half of the core radius described above. The coil has 50 turns, and the total length of the winding portion 11 is 42 mm. With other conditions unchanged, for different δ values and d values, a total of four groups are divided. The inductance of the corresponding inductors is measured, and the eddy current loss of the coil is calculated. The measurement results are compared with those of control groups 1 and 2. The results are shown in Table 1.

[0065] For group 1, the middle magnetic column is divided into two sections, with the width of the air gap δ = 8 mm and the spacing d = 4 mm;

[0066] For group 2, the middle magnetic column is divided into two sections, with the width of the air gap δ = 5 mm and the spacing d = 2.5;

[0067] For group 3, the middle magnetic column is divided into two sections, with the width of the air gap δ = 15 mm and the spacing d = 7.5;

[0068] For group 4, the middle magnetic column is divided into six sections, with five air gaps. The width of each air gap is δ1, δ2, δ3, δ4, and δ5, and satisfies δ1+δ2+δ3+δ4+δ5=8mm. δ1, δ2, δ3, and δ4 are the widths of the four side air gaps. Each middle column has two side air gaps, and δ5 is the width of the middle air gap. Among them, δ1=δ2=δ3=δ4=1mm, δ5=4mm, and the spacing d=4mm.

[0069] For control group 1, the middle magnetic column is divided into two sections, with the width of the air gap δ = 8 mm and the spacing d = 2 mm;

[0070] For control group 2, the middle magnetic column is divided into two sections, the width of the air gap is δ=8 mm, and the spacing is d=1 mm.

[0071] Table 1

[0072]

[0073] As can be seen from Table 1, compared with control group 1 and control group 2, by increasing d and / or reducing δ, the eddy current loss of the coils in groups 1, 2, 3, and 4 is reduced and the inductance is increased;

[0074] Compared with group 1, when multiple air gaps are used, the inductance of group 4 can be further increased and the eddy current loss can be further reduced.

[0075] In summary, the way to increase the inductance of the inductor is:

[0076] Method 1: By setting a distance between the magnetic core 2 and the coil, the distance between the magnetic core 2 and the coil is increased, the cutting of the leakage flux of the magnetic core by the coil is reduced, and the eddy current loss of the coil is reduced;

[0077] Method 2: By providing at least two air gaps 7 on the magnetic core 2, the width of all air gaps 7 is equal to the width of the air gap when one air gap 7 is provided on the magnetic core 2, thereby reducing the relative width of the air gap, reducing the leakage flux on the magnetic core, thereby reducing the core loss, and reducing the cutting of the leakage flux of the magnetic core by the coil, thereby reducing the eddy current loss of the coil;

[0078] Method 3: The inductance of the inductor is increased by combining the method 1 of reducing the relative width of the air gap with the method 2 of increasing the distance between the magnetic core 2 and the coil to increase the degree of increase in inductance.

[0079] like Figure 3 As shown, in an embodiment of the present invention, first protrusions 4 axially extending relative to the winding portion 11 are provided on opposite sides of the top of the winding portion 11, and second protrusions 5 axially extending relative to the winding portion 11 are provided on opposite sides of the bottom of the winding portion 11, and part of the connecting magnetic column is clamped between the first protrusion 4 and the second protrusion 5.

[0080] In an embodiment of the present invention, when there is a distance between the upper and lower end faces and the left and right end faces of the middle column and the inner wall of the hollow channel 111, in order to realize the installation of the magnetic core 2 on the skeleton 1, a first protrusion 4 is provided at the top of the winding part 11, and a second protrusion 5 is provided at the bottom of the winding part 11, so that a clamping space is formed between the first protrusion 4 and the second protrusion 5, and the partially connected magnetic column is clamped in the clamping space, thereby realizing the assembly of the magnetic core 2 and the skeleton 1 and improving the stability of the magnetic core 2 on the skeleton 1.

[0081] like Figure 3 As shown, in an embodiment of the present invention, the left and right sides of the first protrusion 4 radially protrude relative to the winding portion 11 to form two first extension portions 41, and the left and right sides of the second protrusion radially protrude relative to the winding portion 11 to form two second extension portions 51, and the sub-magnetic column and the remaining connecting magnetic columns are clamped between the first extension portion 41 and the second extension portion 51.

[0082] In an embodiment of the present invention, in order to further enhance the assembly strength between the magnetic core 2 and the skeleton 1, a first extension portion 41 is provided on both sides of the left and right sides of the first protrusion 4, and a second extension portion 51 is provided on both sides of the left and right sides of the second protrusion 5. A clamping space is formed between the first extension portion 41 and the second extension portion 51, and the sub-magnetic column and the remaining connecting magnetic columns are all arranged in the clamping space.

[0083] like Figure 3 As shown, in an embodiment of the present invention, two first protrusions radially protrude relative to the winding portion 11 to form a first groove body, two second protrusions radially protrude relative to the winding portion 11 to form a second groove body, and the winding portion 11 located between the first protrusions and the second protrusions is provided with four third protrusions radially protruding relative to the winding portion 11, and a third groove body is formed between the two opposing third protrusions, and each groove body is connected in sequence to form a continuous limiting groove 6.

[0084] In an embodiment of the present invention, the first protrusion protrudes radially upward relative to the winding portion 11, so that a first groove body is formed between the two opposite first protrusions, and the second protrusion protrudes radially downward relative to the winding portion 11, so that a second groove body is formed between the two opposite second protrusions. In addition, the winding portion 11 between the first protrusion and the second protrusion is also provided with four third protrusions radially protruding relative to the winding portion 11, and a third groove body is formed between the two opposite third protrusions. A limiting groove 6 for limiting the coil is formed between the first groove body, the second groove body, and the two third groove bodies, so that the coil is wound in the limiting groove 6, thereby avoiding winding chaos of the coil during winding.

[0085] like Figure 3 As shown, in the embodiment of the present invention, a plurality of coil pins 12 are provided on the second protrusion and are spaced apart along the left-right direction.

[0086] In the embodiment of the present invention, a coil pin 12 is provided on the second bump. The coil wound on the winding portion 11 has an input end and an output end. Both the coil input end and the coil output end are provided on the coil pin 12 .

[0087] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any technician familiar with this patent can make slight changes or modifications to equivalent embodiments using the above technical content without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the solution of the present invention.

Claims

1. An inductor comprising a magnetic core and a coil, wherein the coil is wound around at least a portion of the magnetic core, characterized in that: A spacing is provided between at least a portion of the magnetic core and the coil; An insulating structure is provided on at least part of the magnetic core, and the coil is wound on the insulating structure; The insulating structure includes a frame having a winding portion for winding a coil, a hollow channel being provided in the axial direction of the winding portion, a magnetic core being provided on the frame, and at least a portion of the magnetic core being inserted into the hollow channel, with a gap being provided between the portion of the magnetic core and the hollow channel; Two magnetic columns are provided on opposite sides of the magnetic core, and an intermediate magnetic column is provided on the magnetic core between the two magnetic columns. The intermediate magnetic column is inserted into the hollow channel, and a gap is provided between the intermediate magnetic column and the hollow channel. The magnetic core includes two sub-cores, each sub-core including an outer ring magnetic core and a middle column arranged inside the outer ring magnetic core; the two outer ring magnetic cores are opposite and in contact with each other to form two magnetic columns, and the two middle columns are opposite and spaced apart and inserted into the hollow channel to form an intermediate magnetic column and an air gap; The inductor satisfies the following equation: K=r 2 / (r+0.29*δ / π) 2 ; γ=d / δ; M=K*γ 1 / 2 ; Where r is the radius of the core, δ is the width of the air gap, d is the distance between the coil and the core, K is the conversion factor of the magnetic flux of the core, γ is the conversion factor of the edge flux loss, and M is the effective conversion factor of the magnetic flux; Among them, the middle magnetic column is divided into six sections, and there are 5 air gaps on the magnetic core. The width of each air gap is δ1, δ2, δ3, δ4, and δ5, respectively, and satisfies δ1+δ2+δ3+δ4+δ5=8mm. δ1, δ2, δ3, and δ4 are the widths of the four side air gaps. Two side air gaps are set on each middle column, and δ5 is the width of the middle air gap. Among them, δ1=δ2=δ3=δ4=1mm, δ5=4mm, and the spacing d=4mm.

2. The inductor according to claim 1, wherein The two sub-magnetic cores are of the same size and are both E-shaped. The outer ring magnetic core includes two sub-magnetic columns arranged on both sides of the middle column and a connecting magnetic column connecting the two sub-magnetic columns. The middle column is inserted into the hollow channel. One side wall of the winding part is clamped between one sub-magnetic column and the middle column and abuts against the connecting magnetic column, and its opposite side wall is clamped between the other sub-magnetic column and the middle column and abuts against the connecting magnetic column.

3. The inductor according to claim 2, wherein: The middle column is a rectangular parallelepiped column, and the distances between the upper and lower end faces of the middle column and the hollow channel are equal, and the distances between the left and right end faces of the middle column and the hollow channel are equal.

4. The inductor according to claim 2 or 3, wherein: The opposite sides of the top of the winding part are provided with first protrusions axially protruding relative to the winding part, and the opposite sides of the bottom of the winding part are provided with second protrusions axially protruding relative to the winding part. Part of the connecting magnetic column is clamped between the first protrusion and the second protrusion.

5. The inductor according to claim 4, wherein: The left and right sides of the first protrusion radially extend relative to the winding part to form two first extension parts, and the left and right sides of the second protrusion radially extend relative to the winding part to form two second extension parts. The sub-magnetic column and the remaining connecting magnetic columns are clamped between the first extension part and the second extension part.

6. The inductor according to claim 4, wherein: The two first protrusions radially protrude relative to the winding part to form a first groove body, the two second protrusions radially protrude relative to the winding part to form a second groove body, and the winding part located between the first protrusions and the second protrusions is provided with four third protrusions radially protruding relative to the winding part, and a third groove body is formed between the two opposing third protrusions, and each groove body is connected in sequence to form a continuous limiting groove.

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