CN112017849A

CN112017849A - Electromagnetic element with heat conduction structure and coil

Info

Publication number: CN112017849A
Application number: CN201910464164.2A
Authority: CN
Inventors: 李和纯; 何俊汉; 游善溥
Original assignee: Yao Sheng Electronic Co Ltd
Current assignee: Yao Sheng Electronic Co Ltd
Priority date: 2019-05-30
Filing date: 2019-05-30
Publication date: 2020-12-01

Abstract

An electromagnetic element with heat conducting structure and coil comprises a frame body including an outer frame made of magnetically conductive material; the outer frame comprises at least one opening and at least one strut which is made of magnetic conductive material, one end of the strut is positioned at one side of the outer frame, and the other end is positioned at the other side of the outer frame; wherein the frame body formed by the outer frame and the at least one strut forms a closed loop, so that a magnetic field can pass through the frame body from a point to form a closed loop; at least one coil, each coil surrounding the corresponding pillar of the at least one pillar, wherein two ends of the coil extend out of the inner space of the outer frame of the frame body for guiding current to enter and exit; an adhesive area is located in the inner space of the outer frame of the frame body, wherein the adhesive area is formed by heat-conducting adhesive and is arranged between the coil and the support wrapped by the coil and between the coil and the corresponding inner side edge of the frame body at the periphery.

Description

Electromagnetic element with heat conduction structure and coil

Technical Field

The present disclosure relates to electromagnetic components, and particularly to an electromagnetic component with a heat conducting structure and a coil.

Background

As shown in fig. 5, the conventional method for manufacturing an inductor mainly uses a spiral ring structure, in which a spiral ring-shaped coil 41 'is wrapped around a ring-shaped magnetic conductive ring 31'. Such a spiral coil will generate a ring-shaped magnetic field in the center of the coil 41 ', which is integrated in the form of an inductor around the ring-shaped magnetically permeable ring 31'. This type of inductor has the disadvantage that the toroidal coil must be wound manually or by means of a machine with a complex structure, but the machine of this type is not suitable for manufacturing small-volume toroidal coils, since the toroidal coils have considerable dimensions. If manufactured manually, this is time-consuming and costly. In addition, the conventional spiral loop inductor easily causes abrasion of the lead of the coil in the manufacturing process, thereby damaging the overall insulation.

As shown in fig. 6, another structure for forming an inductor in the prior art mainly includes a frame 10 ', which includes an outer frame 20 ' made of a magnetic conductive material and at least one pillar 30 ' made of a magnetic conductive material, wherein one end of the pillar 30 ' is located on one side of the outer frame 20 ', and the other end of the pillar 30 ' is located on the other side of the outer frame 20 '; wherein the frame 10 'formed by the outer frame 20' and the at least one pillar 30 'forms a closed loop, such that a magnetic field can pass through the frame 10' from a point to form a closed loop. At least one coil 40 ', each coil 40 ' surrounding a corresponding pillar 30 ' of the at least one pillar 30 ', wherein both ends of the coil 40 ' extend out of the outer frame 20 ' of the frame body 10 ' for guiding current to and from. When the coil 40 ' is energized, a magnetic field is formed inside the coil 40 ', and the magnetic lines of the magnetic field extend outward from one opening of the coil and then enter the other opening of the coil 40 ' to form a closed loop. However, this structure has a disadvantage of lacking an effective heat conduction mechanism, and the heat generated when the coil is energized will accumulate inside the frame body and cannot be conducted to the outside, which results in the temperature of the coil increasing, and when the temperature of the lead wire is higher, the current amount of the current will be reduced, and the inductance value will be reduced. Therefore, the inductance is not rated, and the whole circuit cannot achieve the expected effect.

Therefore, the present invention is directed to a novel electromagnetic device having a heat conductive structure and a coil, so as to solve the above-mentioned drawbacks of the prior art.

Disclosure of Invention

In order to solve the above problems in the prior art, the present invention provides an electromagnetic component having a heat conducting structure and a coil, wherein a heat conducting adhesive is filled in an inner space of a frame body, so that heat generated by the coil is effectively transferred to the frame body through the heat conducting adhesive. Therefore, the invention can effectively remove the heat generated by the wire, and the higher the temperature of the wire is, the higher the current amount of the current can be reduced, so that the inductance value is reduced. Therefore, the inductance is not the rated inductance, and the whole circuit cannot achieve the expected effect. Meanwhile, compared with the inductor in a spiral ring form, the inductor is simple in manufacturing mode, and therefore cost can be saved. And the insulation of the conducting wire in the coil is not damaged in the manufacturing process. The coil of the present invention may have various wire types such as flat wire, self-adhesive twisted wire, or self-adhesive single-core wire.

In order to achieve the above object, the present invention provides an electromagnetic component having a heat conducting structure and a coil, which includes a frame body including an outer frame and at least one pillar; the outer frame is made of magnetic conductive material; the outer frame comprises at least one opening, wherein the inner space of the outer frame is a closed space formed by all wall surfaces in the outer frame and the section with the minimum area of the at least one opening; at least one pillar, one end of the pillar is positioned at one side of the outer frame, and the other end of the pillar is positioned at the other side of the outer frame; wherein the support is made of magnetic conductive material; wherein the frame body formed by the outer frame and the at least one strut forms a closed loop, so that a magnetic field can pass through the frame body from a point to form a closed loop; at least one coil, each coil surrounding the corresponding pillar of the at least one pillar, wherein two ends of the coil extend out of the inner space of the outer frame of the frame body for guiding current to enter and exit; an adhesive area is located in the inner space of the outer frame of the frame body, wherein the adhesive area is formed by heat-conducting adhesive and is arranged between the coil and the support wrapped by the coil and is also arranged between the coil and the corresponding inner side edge of the frame body at the periphery.

Further, the volume of the adhesive area accounts for more than 30% of the inner space of the outer frame of the frame body.

Further, the thermal conductivity of the thermal conductive paste constituting the adhesive region is greater than 0.3 λ (W/m · K).

Furthermore, the at least one support is a single support, and the coil is wound on the support to form an inductor.

Furthermore, the at least one strut is two struts, one end of each strut is positioned at one side of the outer frame, and the other end of each strut is positioned at the other side of the outer frame; the at least one coil is two coils, and each coil surrounds a corresponding pillar of the two pillars to form a transformer.

Furthermore, the outer frame is provided with two openings, and the inner space is a closed space formed by all wall surfaces in the outer frame and the minimum area cross sections of the two openings.

Further, the wire of the coil is selected from a flat wire, a self-adhesive twisted wire or a self-adhesive single-core wire.

Drawings

FIG. 1 is a schematic view of the combination of elements of the present invention.

Fig. 2 is a schematic view of a frame body according to the present invention.

FIG. 3 is a schematic diagram of an assembly of elements according to another embodiment of the present invention.

Fig. 4 is a schematic view of the frame body of fig. 3.

Fig. 5 is a schematic cross-sectional view of a prior art inductor structure.

Fig. 6 is another inductor structure of the prior art.

Description of the reference numerals

10 frame body

10' frame body

11 inner side edge

12 inner side edge

13 inner side edge

14 inner side edge

20 outer frame

20' outer frame

21 opening

25 inner space

30 support

30' support

31' magnetic conductive ring

40 coil

40' coil

41 opening

41' coil

42 opening

50 gluing area

51 Heat-conducting glue

100 closed loop.

Detailed Description

The technical solution in the embodiments of the present invention is clearly and completely described below with reference to the drawings in the embodiments of the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.

Referring to fig. 1 to 4, an electromagnetic element with a heat conducting structure and a coil according to the present invention includes the following components:

a frame body 10, comprising: an outer frame and at least one support;

an outer frame 20; the outer frame 20 is made of a magnetically permeable material. The outer frame 20 includes at least one opening 21, wherein the inner space 25 of the outer frame 20 is a closed space formed by the wall surfaces of the inner frame 20 and the minimum area cross section of the at least one opening 21. In fig. 2, the outer frame 20 has two openings 21, so the internal space 25 is a closed space formed by the wall surfaces A, B, C, D of the outer frame 20 and the minimum area cross-section E, F of the two openings 21.

At least one support post 30, one end of the support post 30 is located at one side of the outer frame 20, and the other end of the support post 30 is located at the other side of the outer frame 20; wherein the support 30 is made of magnetically conductive material.

Wherein the frame body 10 formed by the outer frame 20 and the at least one support 30 forms a closed loop, so that a magnetic field can pass through the frame body 10 from a point to form a closed loop.

At least one coil 40, each coil 40 surrounding a corresponding pillar 30 of the at least one pillar 30, wherein two ends of the coil 40 extend out of the inner space 25 of the outer frame 20 of the frame body 10 for guiding current to and from. Wherein the coil 40 is made of a conductive metal such as copper or aluminum. The wire of the coil 40 can be of various types, such as flat wire, self-adhesive stranded wire, or self-adhesive monofilament wire.

According to the electromagnetic theory, when the coil 40 is energized, a magnetic field is formed inside the coil 40, and the magnetic lines of the magnetic field extend outward from one opening 41 of the coil 40 and then enter the other opening 42 of the coil 40 to form a closed loop 100. In the present invention, since the coils 40 surround the corresponding pillars 30, a substantial majority of the magnetic lines of force are distributed along the frame body 10 to form a closed loop 100 passing through the interior of the coil 40 as shown in the figure.

An adhesive area 50 is located in the inner space 25 of the outer frame 20 of the frame body 10, wherein the adhesive area 50 is formed by a thermal conductive adhesive 51 and is located between the coil 40 and the pillar 30 covered by the coil 40, and is also located between the coil 40 and the corresponding

inner sides

11 and 12 of the frame body 10 at the periphery, and in fig. 1, the

inner sides

11 and 12 respectively correspond to the inner left and the inner right of the frame body 10. Wherein the volume of the adhesive area 50 is more than 30% of the inner space 25 of the outer frame 20 of the frame body 10, and the thermal conductivity of the thermal conductive adhesive 51 constituting the adhesive area 50 is more than 0.3 λ (W/m · K, W represents Watt, m represents meter, and K represents Kjeldahl temperature).

In the embodiment of fig. 1, a single pillar 30 is taken as an example, and the structure of the single pillar 30 is suitable for an inductor.

Another embodiment of the present invention is described below, as an embodiment of a dual strut 30, comprising the following elements:

a frame body 10, comprising: an outer frame and two struts;

an outer frame 20, the outer frame 20 is made of magnetic conductive material. The outer frame 20 includes at least one opening 21, wherein the inner space 25 of the outer frame 20 is a closed space formed by the wall surfaces of the inner frame 20 and the minimum area cross section of the at least one opening 21. In fig. 4, since there are two openings 21, the internal space 25 is a closed space formed by the wall surfaces A, B, C, D inside the outer frame 20 and the minimum area cross-section E, F of the two openings 21.

Two support columns 30, one end of each support column 30 is located at one side of the outer frame 20, and the other end of each support column 30 is located at the other side of the outer frame 20; wherein each support post 30 is made of a magnetically permeable material.

The frame 10 formed by the outer frame 20 and the two supports 30 forms a closed loop, so that a magnetic field can pass through the frame 10 from a point to form a closed loop.

Two coils 40, each coil 40 surrounding a corresponding pillar 30 of the two pillars 30, wherein two ends of the coil 40 extend out of the inner space 25 of the outer frame 20 of the frame body 10 for guiding current to and from.

According to electromagnetic theory, when each coil 40 is energized, a magnetic field is formed inside each coil 40, and the magnetic lines of the magnetic field extend outward from one opening 41 of each coil 40 and then enter the other opening 42 of the coil 40 to form a closed loop 100. In the present invention, since each coil 40 surrounds the periphery of the corresponding strut 30, a substantial majority of the magnetic lines of force are distributed along the frame body 10 to form a closed loop 100 passing through the interior of each coil 40 as shown in the figure.

An adhesive area 50 is located in the inner space 25 of the outer frame 20 of the frame body 10, wherein the adhesive area 50 is formed by a heat conductive adhesive 51 and is located between each coil 40 and the pillar 30 covered by the coil 40, and is also located between each coil 40 and the corresponding inner side edges 11, 12, 13, 14 of the frame body 10 at the periphery, and in fig. 3, the inner side edges 11, 12, 13, 14 respectively correspond to the inner left side, the inner right side, the inner upper side and the inner lower side of the frame body 10. Wherein the volume of the adhesive area 50 is more than 30% of the inner space 25 of the outer frame 20 of the frame body 10, and the thermal conductivity of the thermal conductive adhesive 51 constituting the adhesive area 50 is more than 0.3 λ (W/m · K, W represents Watt, m represents meter, and K represents Kjeldahl temperature).

The above-described double leg 30 structure is suitable for a transformer. When the coils 40 are energized, magnetic lines of force of each coil 40 form a closed loop along the frame body 10, and the mutual inductance of the two coils 40 causes the primary-side and secondary-side voltages to vary.

According to the invention, the heat-conducting glue is filled in the internal space of the frame body, so that the heat generated by the coil is effectively transmitted to the frame body outwards through the heat-conducting glue. Therefore, the invention can effectively remove the heat generated by the wire, and the higher the temperature of the wire is, the higher the current amount of the current can be reduced, so that the inductance value is reduced. Therefore, the inductance is not the rated inductance, and the whole circuit cannot achieve the expected effect. Compared with the inductor in a spiral ring form, the inductor in the invention has a simpler manufacturing method, so that the cost can be saved. And the insulation of the conducting wire in the coil is not damaged in the manufacturing process. The coil of the present invention may have various wire types such as flat wire, self-adhesive stranded wire, or self-adhesive monofilament wire.

It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Claims

1. An electromagnetic component having a thermally conductive structure and a coil, comprising:

a frame body, comprising: an outer frame and at least one support;

an outer frame made of magnetic conductive material; the outer frame comprises at least one opening, wherein the inner space of the outer frame is a closed space formed by all wall surfaces in the outer frame and the section with the minimum area of the at least one opening;

at least one pillar, one end of the pillar is positioned at one side of the outer frame, and the other end of the pillar is positioned at the other side of the outer frame; wherein the support is made of magnetic conductive material;

wherein the frame body formed by the outer frame and the at least one strut forms a closed loop, so that a magnetic field can pass through the frame body from a point to form a closed loop;

at least one coil, each coil surrounding the corresponding pillar of the at least one pillar, wherein two ends of the coil extend out of the inner space of the outer frame of the frame body for guiding current to enter and exit;

an adhesive area is located in the inner space of the outer frame of the frame body, wherein the adhesive area is formed by heat-conducting adhesive and is arranged between the coil and the support wrapped by the coil and is also arranged between the coil and the corresponding inner side edge of the frame body at the periphery.

2. The electromagnetic component with a thermally conductive structure and a coil as claimed in claim 1, wherein the volume of the adhesive region is more than 30% of the inner space of the outer frame of the frame body.

3. The electromagnetic component with the heat conductive structure and the coil as claimed in claim 1 or 2, wherein the heat conductive glue forming the glue area has a heat conductivity greater than 0.3 λ W/m-K.

4. The electromagnetic component of claim 1, wherein the at least one support is a single support, and the coil is wound on the support to form an inductor.

5. The electromagnetic component with a heat conductive structure and a coil as claimed in claim 1, wherein the at least one support is two supports, one end of each support is located at one side of the outer frame, and the other end of each support is located at the other side of the outer frame; the at least one coil is two coils, and each coil surrounds a corresponding pillar of the two pillars to form a transformer.

6. The electromagnetic component with the heat conductive structure and the coil as claimed in claim 1, wherein the outer frame has two openings, and the inner space is a closed space formed by the wall surfaces inside the outer frame and the minimum area cross-section of the two openings.

7. The electromagnetic component having a thermally conductive structure and a coil of claim 1, wherein the coil is selected from the group consisting of a flat wire, a self-adhesive stranded wire, and a self-adhesive single-core wire.