CN212694975U

CN212694975U - Soft magnetic core

Info

Publication number: CN212694975U
Application number: CN202021647384.3U
Authority: CN
Inventors: 蒋玉梅
Original assignee: Hengdian Group DMEGC Magnetics Co Ltd
Current assignee: Hengdian Group DMEGC Magnetics Co Ltd
Priority date: 2020-08-10
Filing date: 2020-08-10
Publication date: 2021-03-12
Anticipated expiration: 2030-08-10

Abstract

The utility model relates to a magnetic core technical field discloses a soft magnetic core, include: the magnetic core main body comprises a substrate and side legs, wherein the side legs comprise a first side leg and a second side leg which are oppositely arranged at two ends of the substrate; the magnetic core split body comprises a cover plate and a middle column, the cover plate is arranged at one end, far away from the substrate, of the first side leg and the second side leg in a covering mode, one end of the middle column is arranged on the side face of the cover plate, and the other end of the middle column is connected to the substrate; and the coil is wound on the periphery of the center pillar. Through the structure, the soft magnetic core can avoid the leakage inductance and is beneficial to reducing the loss of the soft magnetic core.

Description

Soft magnetic core

Technical Field

The utility model relates to a magnetic core technical field especially relates to a soft-magnetic core.

Background

The soft magnetic core is easy to magnetize and demagnetize due to its low coercive force and high magnetic conductivity, and is widely used in various electrical and electronic devices.

As shown in fig. 1, a conventional soft magnetic core in the market at present generally adopts a structure in which an E-shaped main body 100 and an I-shaped cover plate 101 are connected in a matching manner, the E-shaped main body 100 is divided into two side legs 102 and a center pillar 103 located between the two side legs 102, and an air gap 104 is formed on the center pillar 103. Since the coil of the soft magnetic core is wound around the center pillar 103, during actual use, a leakage inductance (loss of inductance in air) occurs at the air gap 104 portion of the center pillar 103, so that the loss of the soft magnetic core increases. In addition, the soft magnetic core is glued at the air gap 104 of the center pillar 103 during assembly, so that the I-shaped cover plate 101 is connected to the center pillar 103.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a soft magnetic core, this soft magnetic core can avoid the emergence of the sense of leaking, is favorable to reducing the loss of self.

To achieve the purpose, the utility model adopts the following technical proposal:

a soft magnetic core comprising: the magnetic core main body comprises a substrate and side legs, wherein the side legs comprise a first side leg and a second side leg which are oppositely arranged at two ends of the substrate; the magnetic core split body comprises a cover plate and a middle column, the cover plate is arranged at one end, far away from the substrate, of the first side leg and the second side leg in a covering mode, one end of the middle column is arranged on the side face of the cover plate, and the other end of the middle column is connected to the substrate; and the coil is wound on the periphery of the center pillar.

Preferably, an air gap is provided between the cover plate and the first and second legs.

As a preferred scheme of the soft magnetic core, glue is filled in an air gap between the cover plate and the first side leg and the second side leg, and the cover plate is adhered to the first side leg and the second side leg through the glue.

Preferably, the width of the air gap between the cover plate and the first leg is equal to the width of the air gap between the cover plate and the second leg.

As a preferred scheme of the soft magnetic core, the first side leg includes a first side surface, the second side leg includes a second side surface, the first side surface and the second side surface are circumferential surfaces and are arranged oppositely, and a central axis of the first side surface and a central axis of the second side surface are both coincident with a central axis of the center pillar.

As a preferable aspect of the soft magnetic core, the first side surface and the second side surface are equidistant from a central axis of the center pillar.

As a preferable aspect of the soft magnetic core, the center pillar is connected to the center of the lid plate.

As a preferable mode of the soft magnetic core, a projection of the core main body on the side surface of the cover plate coincides with a projection of the core division body on the side surface of the cover plate.

As a preferable mode of the soft magnetic core, the core main body and the core division body are both integrally formed pieces.

As a preferable mode of the soft magnetic core, the core main body and the core division body are both ferrite magnetic material pieces.

The utility model has the advantages that:

the utility model provides a soft magnetic core, this soft magnetic core include magnetic core main part, magnetic core components of a whole that can function independently and coil, and the limit leg of magnetic core main part sets up the one end that the base plate was kept away from to first limit leg and second limit leg in the base plate both ends of magnetic core main part including relative, the cover plate lid of magnetic core components of a whole that can function independently first limit leg and second limit leg, and the one end of center pillar sets up on the side of cover plate, and the other end is connected on the base plate, and the coil can magnetize the center pillar around the periphery of locating the center pillar. Through above-mentioned structure, connected respectively on cover plate and base plate by the both ends of coil winding's center pillar, avoided the air gap to appear in the wire winding region to avoid the emergence of the leakage inductance phenomenon, reduced the loss of this soft magnetic core.

Drawings

FIG. 1 is a schematic diagram of a prior art soft magnetic core configuration;

fig. 2 is a schematic structural diagram of a soft magnetic core according to an embodiment of the present invention.

In fig. 1:

100. a body of type E; 101. a type I coverslip; 102. side legs; 103. a center pillar; 104. an air gap.

In fig. 2:

1. a magnetic core body; 11. a substrate; 12. side legs; 121. a first side leg; 1211. a first side surface; 122. a second side leg; 1221. a second side surface; 2. the magnetic cores are separated; 21. a cover sheet; 22. a center pillar; 3. a coil; 4. an air gap.

Detailed Description

In order to make the technical problem solved by the present invention, the technical solutions adopted by the present invention and the technical effects achieved by the present invention clearer, the following will be described in further detail with reference to the accompanying drawings, and obviously, the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by the skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The technical solution of the soft magnetic core provided by the present invention is described below by referring to the accompanying drawings and specific embodiments.

As shown in fig. 2, the present embodiment provides a soft magnetic core, which includes a magnetic core main body 1, a magnetic core split body 2 and a coil 3, wherein an accommodating cavity is formed in the magnetic core main body 1, the magnetic core split body 2 includes a cover sheet 21 and a center pillar 22, the cover sheet 21 covers a port of the accommodating cavity, one end of the center pillar 22 is disposed on a side surface of the cover sheet 21, the other end of the center pillar is connected to a bottom surface of the accommodating cavity (i.e., connected to the magnetic core main body 1), and the coil 3 is wound around an outer periphery of the center pillar 22 and can magnetiz. Through the structure, the two ends of the central column 22 wound by the coil 3 are respectively connected to the cover plate 21 and the magnetic core main body 1, so that the air gap 4 is prevented from being formed in the winding area, the leakage inductance phenomenon is prevented, and the loss of the soft magnetic core is reduced.

Preferably, the core division body 2 is an integrally formed piece, i.e. the cover plate 21 and the middle pillar 22 are made by an integrally forming process. Specifically, the raw materials for manufacturing the cover plate 21 and the middle column 22 are integrally pressed and formed, and then are sintered at high temperature to finally form the magnetic core split body 2, so that the overall strength of the magnetic core split body 2 can be enhanced, the processing process is simple, and the manufacturing cost is reduced. It should be noted that the magnetic core split body 2 is a ferrite magnetic material member, is composed of iron oxide and one or more oxides or carbonate compounds of other metals, and has the advantages of high magnetic permeability, high resistance in a wide frequency range, low eddy current loss and the like.

In the present embodiment, the magnetic core main body 1 includes a base plate 11 and a side leg 12, the side leg 12 includes a first side leg 121 and a second side leg 122 oppositely disposed at two ends of the base plate 11, an accommodating cavity is formed between the first side leg 121 and the second side leg 122, and one end of the center pillar 22 away from the cover plate 21 abuts on the base plate 11. Specifically, the magnetic core main body 1 is an integrally formed member, that is, the base plate 11 and the leg 12 are integrally formed. Specifically, the raw materials for manufacturing the substrate 11 and the side legs 12 are integrally pressed and formed, and then are sintered at a high temperature to finally form the magnetic core main body 1, so that the overall strength of the magnetic core main body 1 can be enhanced, the processing process is simple, and the manufacturing cost of the soft magnetic core is reduced. It should be noted that the magnetic core body 1 is a ferrite magnetic material, is composed of iron oxide and one or more oxides or carbonate compounds of other metals, and has the advantages of high magnetic permeability, high resistance in a wide frequency range, low eddy current loss, and the like.

In this embodiment, after the magnetic core body 1 is sintered, the two end faces of the magnetic core body 1 that are provided to face each other are polished to ensure the height dimension of the magnetic core body 1 to be accurate. Then, an air gap 4 is formed by taking the end face of the magnetic core main body 1 far away from the cover plate 21 as a reference, so that the air gap 4 is arranged between the cover plate 21 and the first side leg 121 and the second side leg 122 after the magnetic core main body 1 and the magnetic core split body 2 are assembled, the air gap 4 can adjust the magnetic conductivity, the direct current bias is improved, and the magnetic characteristics of the soft magnetic core can be improved.

Preferably, the first side leg 121 includes a first side surface 1211, the second side leg 122 includes a second side surface 1221, both the first side surface 1211 and the second side surface 1221 are circumferential surfaces and are oppositely disposed, both the first side surface 1211 and the second side surface 1221 have a circular arc-shaped cross-sectional shape, and both a central axis of the first side surface 1211 and a central axis of the second side surface 1221 coincide with a central axis of the center pillar 22, so that the first side leg 121 and the second side leg 122 are coaxially disposed with the center pillar 22, thereby facilitating the arrangement of the overall structure of the soft magnetic core.

More preferably, the first side 1211 and the second side 1221 are equidistant from the central axis of the center pillar 22, so that the first side leg 121 and the second side leg 122 have the same influence on the magnetic field generated by the center pillar 22, which is beneficial to ensure that the magnetic field generated by the soft magnetic core is symmetrically and uniformly distributed.

In the present embodiment, the center pillar 22 is connected to the center of the cover sheet 21 so that the base plate 11 and the cover sheet 21 are arranged to face each other. Preferably, the projection of the magnetic core main body 1 on the side surface of the cover plate 21 coincides with the projection of the magnetic core sub-body 2 on the side surface of the cover plate 21, so that the magnetic core main body 1 and the magnetic core sub-body 2 are arranged in a facing and edge alignment manner, which is beneficial to the overall structural arrangement of the soft magnetic core and the generated magnetic field distribution.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, rearrangements and substitutions will now occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A soft magnetic core, comprising:

the magnetic core comprises a magnetic core main body (1) and a magnetic core, wherein the magnetic core main body comprises a substrate (11) and side legs (12), and the side legs (12) comprise a first side leg (121) and a second side leg (122) which are oppositely arranged at two ends of the substrate (11);

the magnetic core split body (2) comprises a cover plate (21) and a center pillar (22), the cover plate (21) is arranged at one end, far away from the substrate (11), of the first side leg (121) and the second side leg (122) in a covering mode, one end of the center pillar (22) is arranged on the side face of the cover plate (21), the other end of the center pillar (22) is connected to the substrate (11), air gaps (4) are arranged between the cover plate (21) and the first side leg (121) and between the cover plate (21) and the second side leg (122), glue is filled in the air gaps (4) between the cover plate (21) and the first side leg (121) and between the cover plate and the second side leg (122), and the cover plate (21) is adhered to the first side leg (121) and the second side leg (122) through the glue;

and the coil (3) is wound on the periphery of the center pillar (22).

2. A soft magnetic core according to claim 1, characterised in that the width of the air gap (4) between the cover plate (21) and the first leg (121) is equal to the width of the air gap (4) between the cover plate (21) and the second leg (122).

3. A soft magnetic core according to claim 1, wherein the first side leg (121) comprises a first side face (1211), the second side leg (122) comprises a second side face (1221), the first side face (1211) and the second side face (1221) are both circumferential faces and are oppositely arranged, and a central axis of the first side face (1211) and a central axis of the second side face (1221) are both coincident with a central axis of the center leg (22).

4. A soft magnetic core according to claim 3, wherein the first side surface (1211) and the second side surface (1221) are equidistant from a central axis of the center leg (22).

5. A soft magnetic core according to claim 1, wherein the center leg (22) is connected to the center of the lid piece (21).

6. A soft magnetic core according to claim 5, characterized in that the projection of the core body (1) on the side of the cover sheet (21) coincides with the projection of the core division body (2) on the side of the cover sheet (21).

7. A soft magnetic core according to claim 1, wherein the core main body (1) and the core split body (2) are each an integrally formed piece.

8. A soft magnetic core according to claim 1, characterized in that the core body (1) and the core segments (2) are both pieces of ferrite magnetic material.