Inductance element capable of reducing temperature rise

Abstract

The utility model belongs to the technical field of inductance elements, and provides an inductance element capable of reducing temperature rise, which comprises a coil and two oppositely arranged magnetic cores, each magnetic core comprises a magnetic core middle column, and an air gap is arranged between the two oppositely arranged magnetic core middle columns; the coil is wound on the periphery of the magnetic core middle column, a gap is reserved between the inner periphery of the coil and the outer periphery of the magnetic core middle column, and the width of the gap is at least 2 mm. According to the utility model, the inner diameter of the wound coil is increased, the inner surface of the coil is separated from the center post of the magnetic core, a gap is reserved, the width of the gap is at least 2mm, an air gap is formed in the magnetic core, and magnetic leakage exists at the air gap, so that eddy current is generated to a peripheral conductor, and the distance between the air gap and the coil is increased; therefore, the eddy current intensity generated by the leakage flux at the air gap to the coil can be reduced, so that the temperature rise caused by eddy current loss is reduced, the complicated segmented processing of the magnetic core middle column is avoided, and the cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of inductance elements, and particularly relates to an inductance element for reducing temperature rise. Background Art

[0002] When an inductance element works, an alternating magnetic field will generate an induced electromotive force in the magnetic core, thereby causing eddy currents. The eddy currents will generate Joule heat on the magnetic core resistance, resulting in temperature rise. Usually, in order to reduce the temperature rise, methods such as adopting segmented air gaps on the magnetic core or increasing the wire diameter are used. However, the processing of the middle column of the magnetic core with segmented air gaps is very complicated, and usually other materials different from the middle column of the magnetic core are used to fill the air gaps. This method will increase the processing cost. Therefore, an inductance element capable of compressing the magnetic core processing material is needed, and by reducing the eddy current loss method, the purpose of reducing the temperature rise and the processing cost can be achieved. Content of the Utility Model

[0003] Aiming at the defects in the prior art, the utility model provides an inductance element for reducing temperature rise, which realizes the effect of reducing temperature rise by reducing eddy current loss, and reduces the processing cost by using less material for processing the magnetic core.

[0004] To solve the above problems, an inductance element for reducing temperature rise provided by the utility model includes a coil and two oppositely arranged magnetic cores. The magnetic core includes a middle column of the magnetic core, and there is an air gap between the two oppositely arranged middle columns of the magnetic core.

[0005] The coil is wound around the periphery of the middle column of the magnetic core. There is a gap between the inner circumference of the coil and the outer circumference of the middle column of the magnetic core, and the width of the gap is at least 2 mm.

[0006] Generally, in order to reduce the temperature rise, the method of increasing the wire diameter of the coil or changing to a segmented air gap is usually used to solve the problem. However, for the magnetic core with segmented air gaps, different materials are usually stacked on the middle column of the magnetic core to fill the air gaps. Therefore, using the conventional method makes the processing of the magnetic core more complicated and the cost higher. And generally, when the coil is wound, it is closely attached to the middle column of the magnetic core, and only an insulating film is clamped between the coil and the middle column of the magnetic core. In the utility model, by arranging the two magnetic cores oppositely, an air gap is formed between the two middle columns of the magnetic core. There will be a magnetic leakage phenomenon at the air gap, which will generate eddy currents in the middle column of the magnetic core and the conductors around the air gap. In the utility model, on the premise that the coil can be wound, the winding diameter of the coil is increased, so that the coil is far away from the middle column of the magnetic core and the air gap, which can reduce the eddy current intensity generated by the magnetic leakage at the air gap on the coil, thereby reducing the temperature rise caused by eddy current loss, and avoiding complex segmented processing and reducing the cost.

[0007] Preferably, the magnetic core includes a bottom plate, and the middle column of the magnetic core is installed at the central position of the corresponding bottom plate to facilitate uniform magnetic flux distribution.

[0008] Preferably, the magnetic core further includes side columns arranged at both ends of the bottom plate, and a card slot for placing the coil is formed between the side columns and the corresponding middle column of the magnetic core.

[0009] Preferably, the inner wall surface of the side column is an arc surface to reduce the eddy current effect caused by magnetic flux change and reduce eddy current loss.

[0010] Preferably, the width of the card slot is greater than the wire diameter of the coil, and the outer periphery of the coil abuts against the inner wall of the side column to limit the coil and prevent the coil from moving, so that there is a certain distance between the inner periphery of the wound coil and the circumferential surface of the middle column of the magnetic core.

[0011] Preferably, one end of the middle column of the magnetic core away from the corresponding bottom plate is lower than the corresponding end of the side column to facilitate the formation of an air gap between the two middle columns of the magnetic core.

[0012] Preferably, the side columns of the two magnetic cores abut against each other correspondingly.

[0013] Preferably, the cross-sectional shape of the middle column of the magnetic core is circular, elliptical or polygonal to facilitate its application in different products. Description of the Drawings

[0014] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to actual scale.

[0015] Figure 1 It is the front view of an inductance element for reducing temperature rise provided by an embodiment of the present invention;

[0016] Figure 2 It is the schematic diagram of the magnetic core of an inductance element for reducing temperature rise provided by an embodiment of the present invention;

[0017] Figure 3 It is the schematic connection structure diagram of the coil and the magnetic core of an embodiment of the present invention.

[0018] In the drawings, 1 - coil; 2 - bottom plate; 3 - middle column of the magnetic core; 4 - side column; 5 - air gap; 6 - card slot. Detailed Embodiments

[0019] The embodiments of the technical solution of the present utility model will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present utility model, and therefore are only examples and cannot be used to limit the protection scope of the present utility model.

[0020] It should be noted that unless otherwise specified, the technical terms or scientific terms used in this application should have the ordinary meaning understood by those skilled in the art to which the present utility model belongs.

[0021] In the description of this application, it should be understood that the orientation or positional relationship indicated by the terms "center", "length", "upper", "lower", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model.

[0022] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0023] In this application, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0024] Referring to Figure 1 、 Figure 2 and Figure 3 , this embodiment provides an inductor element for reducing temperature rise, which includes a coil 1 and two relatively arranged magnetic cores. The magnetic cores include a magnetic core middle column 3, and there is an air gap 5 between the two relatively arranged magnetic core middle columns 3; the coil 1 is wound around the periphery of the magnetic core middle column 3, and there is a gap between the inner circumference of the coil 1 and the outer circumference of the magnetic core middle column 3, and the width of the gap is at least 2 mm.

[0025] In the present utility model, by arranging two magnetic cores opposite to each other, an air gap 5 is formed between the middle columns 3 of the two magnetic cores. There will be a magnetic leakage phenomenon at the air gap 5, which will generate eddy currents in the surrounding conductor coil 1. When winding the coil 1 through a through-tube, the winding diameter of the coil 1 is increased, and the gap width between the inner circumference of the coil 1 and the outer circumference of the middle column 3 of the magnetic core is at least 2 mm, so that the influence of the magnetic leakage at the air gap 5 on the coil 1 is reduced, thereby reducing the eddy current intensity. Therefore, the temperature rise caused by eddy current loss is reduced, and at the same time, the complicated segmented processing of the middle column 3 of the magnetic core is avoided, and the cost is reduced.

[0026] Specifically, the middle column 3 of the magnetic core is usually a region with a relatively high magnetic flux density. Therefore, when the above-mentioned coil 1 can be wound, its inner circumference is far away from the middle column 3 of the magnetic core, so that the influence of the magnetic flux change in the magnetic core on the coil 1 is reduced, thereby reducing the magnetic core eddy current loss and heat generation; and the depth of the above-mentioned air gap 5 is determined according to the inductance required by the product.

[0027] In the embodiment of the present application, the magnetic core further includes a bottom plate 2 and side columns 4 arranged at both ends of the bottom plate 2. A card slot 6 for placing the coil 1 is formed between the side column 4 and the corresponding middle column 3 of the magnetic core. The above-mentioned middle column 3 of the magnetic core is installed at the center position of the corresponding bottom plate 2, so as to make the magnetic flux distribution in the magnetic core more uniform, balance the electromagnetic coupling in the coil, and thus achieve better electromagnetic performance.

[0028] Specifically, the inner wall surface of the side column 4 is an arc surface, and the arc surface shape can reduce the eddy current effect caused by the magnetic flux change, reduce the eddy current loss, help reduce the temperature rise, and at the same time can also reduce the damage to components such as the coil 1 during assembly.

[0029] In this embodiment, the width of the card slot 6 is greater than the wire diameter of the coil 1, so as to make the winding diameter range of the coil 1 larger and achieve the effect of keeping the coil 1 away from the middle column 3 of the magnetic core. Specifically, the outer circumference of the coil 1 abuts against the inner wall of the side column 4, so as to limit the coil 1 and prevent the coil 1 from moving.

[0030] In the embodiment of the present application, the side columns 4 of the two magnetic cores are correspondingly abutted, and the end of the middle column 3 of the magnetic core away from the corresponding bottom plate 2 is lower than the corresponding end of the side column 4, so as to form an air gap 5 between the two middle columns 3 of the magnetic core.

[0031] In the embodiment of the present application, the cross-sectional shape of the middle column 3 of the magnetic core is circular. In practice, the cross-sectional shape of the middle column 3 of the magnetic core can also be oval or polygonal, so as to be applied in different products.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of the present invention, and they should all be covered within the scope of the claims and the description of the present invention.

Claims

1. An inductor element for reducing temperature rise, characterized in that: include: A coil (1) and two magnetic cores arranged opposite to each other, wherein the magnetic core comprises a magnetic core center column (3), and an air gap (5) is provided between the two magnetic core center columns (3) arranged opposite to each other; The coil (1) is wound around the periphery of the magnetic core center column (3), a gap is left between the inner periphery of the coil (1) and the outer periphery of the magnetic core center column (3), and the width of the gap is at least 2 mm.

2. The inductor component for reducing temperature rise according to claim 1, characterized in that: The magnetic core comprises a base plate (2), and the magnetic core center column (3) is installed at the center position of the corresponding base plate (2).

3. The inductor element for reducing temperature rise according to claim 2, characterized in that: The magnetic core further comprises side columns (4) arranged at both ends of the bottom plate (2), and a slot (6) for placing the coil (1) is formed between the side columns (4) and the corresponding magnetic core center column (3).

4. The inductor element for reducing temperature rise according to claim 3, characterized in that: The inner wall surface of the side column (4) is a curved surface.

5. The inductor element for reducing temperature rise according to claim 3, characterized in that: The width of the slot (6) is greater than the wire diameter of the coil (1), and the outer periphery of the coil (1) abuts against the inner wall of the side column (4).

6. The inductor element for reducing temperature rise according to claim 3, characterized in that: One end of the magnetic core center column (3) away from the corresponding bottom plate (2) is lower than the corresponding end of the side column (4).

7. The inductor element for reducing temperature rise according to claim 3, characterized in that: The side columns (4) of the two magnetic cores are correspondingly abutted.

8. The inductor component for reducing temperature rise according to claim 1, characterized in that: The cross-section of the magnetic core center column (3) is circular, elliptical or polygonal.

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