Direct-current-bias-resistant soft magnetic powder core

Abstract

The utility model provides a soft magnetic powder core resistant to direct current bias, which relates to the technical field of soft magnetic powder cores and comprises a soft magnetic powder core body, a through hole penetrating through the bottom is arranged at the top end of the soft magnetic powder core body close to the center, a first fixing ring is arranged on the inner wall of the through hole, and a second fixing ring is arranged on the periphery of the soft magnetic powder core body. Fixing pieces are symmetrically arranged at the top end and the bottom of the soft magnetic powder core body, through the design of the soft magnetic powder core body, the through hole, the first fixing ring, the second fixing ring and the fixing pieces, the first fixing ring, the second fixing ring and the fixing pieces are used in cooperation, and therefore the soft magnetic powder core body can be prevented from falling, being broken and splashing. And through cooperative use of the first square hole, the second square hole and the circular groove, the heat dissipation effect of the soft magnetic powder core body can be enhanced, and the service life is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of soft magnetic powder core technology, and in particular to a soft magnetic powder core resistant to DC bias. Background Technology

[0002] Soft magnetic powder cores are a type of soft magnetic material made by mixing and pressing ferromagnetic powder particles with an insulating medium. Because the ferromagnetic particles are very small (0.5~5 micrometers for high frequency use) and are separated by a non-magnetic electrically insulating film, they can isolate eddy currents and are suitable for higher frequencies. On the other hand, due to the gap effect between particles, the material has low permeability and constant permeability. Also, because the particle size is small, the skin phenomenon is basically not occurring, and the change in permeability with frequency is relatively stable.

[0003] Common DC bias resistant soft magnetic powder cores have relatively simple structures and lack external fixing structures. During installation, if the DC bias resistant soft magnetic powder core is accidentally dropped to the ground, it is easy for it to break, resulting in fragments that are difficult to find and have insufficient practicality. Therefore, we propose a DC bias resistant soft magnetic powder core. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies. Common DC bias resistant soft magnetic powder core structures are relatively simple and lack external fixing structures. During installation, if the DC bias resistant soft magnetic powder core is accidentally dropped to the ground, it is prone to breakage, resulting in fragments that are difficult to find and thus lack practicality.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A DC bias resistant soft magnetic powder core includes a soft magnetic powder core body. A through hole is opened at the top of the soft magnetic powder core body near the center and extending through the bottom. A first fixing ring is provided on the inner wall of the through hole. A second fixing ring is provided on the outer periphery of the soft magnetic powder core body. Fixing plates are symmetrically arranged at the top and bottom of the soft magnetic powder core body.

[0007] As a preferred embodiment of this utility model, the soft magnetic powder core body is an iron-silicon-aluminum powder core.

[0008] The technical effect of adopting the above-mentioned further solution is that the iron-silicon-aluminum powder core is mainly made of pure iron, silicon and aluminum. By adding silicon and aluminum to pure iron, the magnetic hysteresis coefficient of the material can be reduced to be close to zero, thereby reducing material loss and having a strong resistance to DC bias.

[0009] As a preferred embodiment of this utility model, the outer periphery of the soft magnetic powder core body is coated with a silicon carbide-based wear-resistant coating.

[0010] The technical effects of adopting the above-mentioned further solutions are: the high temperature resistance and high frequency characteristics of silicon carbide have driven the demand for high temperature resistance and wear resistance of the coating of matching magnetic components, which can enhance the surface protection of soft magnetic powder core under high pressure and high temperature conditions, and reduce wear between it and the first fixing ring, the second fixing ring and the fixing plate.

[0011] As a preferred embodiment of this utility model, the inner wall of the first fixing ring is provided with a plurality of first square holes at equal intervals near the top and bottom.

[0012] The technical effect of adopting the above-mentioned further solution is that the inner side of the soft magnetic powder core body can be cooled and dissipated through the first square hole, thereby improving the stability of use.

[0013] As a preferred embodiment of this utility model, the inner wall of the second fixing ring is provided with a plurality of second square holes at equal intervals near the top and bottom.

[0014] The technical effect of adopting the above-mentioned further solution is that the outer periphery of the soft magnetic powder core body can be cooled and dissipated through the second square hole, thereby improving the stability of use.

[0015] As a preferred embodiment of this utility model, the top end of the fixing piece extends through the bottom, and a groove is provided corresponding to the through hole.

[0016] The technical advantage of adopting the above-mentioned further solution is that the grooves and through holes facilitate the installation of the soft magnetic powder core body.

[0017] As a preferred embodiment of this utility model, the top of the fixing plate extends through the bottom and has several circular grooves evenly arranged thereon.

[0018] The technical effect of adopting the above-mentioned further solution is that the circular groove can improve the cooling and heat dissipation effect at the top and bottom of the soft magnetic powder core body.

[0019] As a preferred embodiment of this utility model, the first fixing ring and the second fixing ring are welded to the fixing plate by laser welding.

[0020] The technical effect of adopting the above-mentioned further solution is that by laser welding the first and second fixing rings to the fixing plate, the soft magnetic powder core body can be protected, preventing the soft magnetic powder core body from falling, breaking, and splashing, thus improving its practicality.

[0021] Compared with the prior art, the beneficial effects of this utility model are:

[0022] In this invention, the design of the soft magnetic powder core body, the first fixing ring, the second fixing ring, and the fixing plate, along with the coordinated use of the first fixing ring, the second fixing ring, and the fixing plate, can prevent the soft magnetic powder core body from falling, breaking, and splashing. Compared with traditional soft magnetic powder core bodies, this design effectively improves practicality. The coordinated use of the first square hole, the second square hole, and the circular groove can enhance the heat dissipation effect of the soft magnetic powder core body and extend its service life. Attached Figure Description

[0023] Figure 1 A schematic diagram of the overall structure of a DC bias resistant soft magnetic powder core provided by this utility model;

[0024] Figure 2 A schematic diagram of the overall structure of a DC bias resistant soft magnetic powder core provided by this utility model;

[0025] Figure 3 A side view of the overall structure of a DC bias resistant soft magnetic powder core provided by this utility model;

[0026] Figure 4 This invention provides an anatomical diagram of the overall top structure of a DC bias-resistant soft magnetic powder core.

[0027] Legend: 1. Soft magnetic powder core body; 101. Silicon carbide-based wear-resistant coating; 2. Through hole; 3. First fixing ring; 301. First square hole; 4. Second fixing ring; 401. Second square hole; 5. Fixing piece; 501. Groove; 502. Circular groove. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0029] To facilitate understanding of this utility model, a more comprehensive description of this utility model will be provided below with reference to relevant embodiments, and several embodiments of this utility model will be given. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of this utility model more thorough and complete.

[0030] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0032] Example 1

[0033] like Figure 1-4 As shown, this utility model provides a technical solution: a DC bias resistant soft magnetic powder core, including a soft magnetic powder core body 1, a through hole 2 is provided at the top of the soft magnetic powder core body 1 near the center and extending through the bottom, a first fixing ring 3 is provided on the inner wall of the through hole 2, a second fixing ring 4 is provided on the periphery of the soft magnetic powder core body 1, and fixing plates 5 are symmetrically provided at the top and bottom of the soft magnetic powder core body 1.

[0034] Example 2

[0035] like Figure 1-4As shown, the soft magnetic powder core body 1 is an iron-silicon-aluminum powder core, which is mainly made of pure iron, silicon, and aluminum. By adding silicon and aluminum to pure iron, the magnetic hysteresis coefficient of the material can be reduced to near zero, thereby reducing material loss and providing strong resistance to DC bias. The soft magnetic powder core body 1 is coated with a silicon carbide-based wear-resistant coating 101. The high temperature resistance and high frequency characteristics of silicon carbide drive the demand for high temperature and wear resistance coatings for matching magnetic components, which can enhance the surface protection of the soft magnetic powder core under high pressure and high temperature conditions and reduce wear between it and the first fixing ring 3, the second fixing ring 4, and the fixing plate 5. The inner wall of the first fixing ring 3 has several first square holes 301 equidistantly arranged around the top and bottom. Through the first square holes 301, a certain number of holes can be opened. To cool and dissipate heat on the inner side of the soft magnetic powder core body 1 and improve its stability, the inner wall of the second fixing ring 4 is provided with several second square holes 401 at equal intervals near the top and bottom. The second square holes 401 can cool and dissipate heat on the outer side of the soft magnetic powder core body 1 and improve its stability. The top of the fixing plate 5 extends through the bottom and has a groove 501 corresponding to the through hole 2. The groove 501 and the through hole 2 facilitate the installation of the soft magnetic powder core body 1. The top of the fixing plate 5 extends through the bottom and has several circular grooves 502 evenly arranged. The circular grooves 502 can improve the cooling and heat dissipation effect at the top and bottom of the soft magnetic powder core body 1. The first fixing ring 3 and the second fixing ring 4 are welded to the fixing plate 5 by laser welding to improve the stability.

[0036] The workflow of this utility model is as follows: When assembling and using a DC bias resistant soft magnetic powder core, firstly, a silicon carbide-based wear-resistant coating 101 is sprayed onto the surface of the soft magnetic powder core body 1 using a spray gun. After drying, the first fixing ring 3 is embedded into the through hole 2 opened on the inner side of the soft magnetic powder core body 1, and the second fixing ring 4 is sleeved on the outer periphery of the soft magnetic powder core body 1. Finally, two fixing pieces 5 are placed at the top and bottom of the soft magnetic powder core body 1 in sequence, so that the fixing pieces 5 fit with the first fixing ring 3 and the second fixing ring 4, and the groove 501 corresponds to the through hole 2. Finally, the first fixing ring 3, the second fixing ring 4 and the fixing pieces 5 are welded together using laser welding to complete the entire assembly process. Compared with traditional soft magnetic powder cores, this method effectively improves practicality. Furthermore, the combined use of the first square hole 301, the second square hole 401 and the circular groove 502 can enhance the heat dissipation effect of the soft magnetic powder core body 1 and improve its service life.

[0037] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A DC bias-resistant soft magnetic powder core, comprising a soft magnetic powder core body (1), characterized in that: The soft magnetic powder core body (1) has a through hole (2) at the top near the center and extending through the bottom. The inner wall of the through hole (2) is provided with a first fixing ring (3). The outer periphery of the soft magnetic powder core body (1) is provided with a second fixing ring (4). The top and bottom of the soft magnetic powder core body (1) are symmetrically provided with fixing plates (5).

2. The DC bias-resistant soft magnetic powder core according to claim 1, characterized in that: The soft magnetic powder core body (1) is an iron-silicon-aluminum powder core.

3. The DC bias-resistant soft magnetic powder core according to claim 1, characterized in that: The outer periphery of the soft magnetic powder core body (1) is coated with a silicon carbide-based wear-resistant coating (101).

4. The DC bias-resistant soft magnetic powder core according to claim 1, characterized in that: The inner wall of the first fixing ring (3) is provided with a number of first square holes (301) at equal intervals around the top and bottom.

5. A DC bias-resistant soft magnetic powder core according to claim 1, characterized in that: The inner wall of the second fixing ring (4) is provided with several second square holes (401) at equal intervals around the top and bottom.

6. The DC bias-resistant soft magnetic powder core according to claim 1, characterized in that: The top of the fixing piece (5) extends through the bottom, and a groove (501) is provided corresponding to the through hole (2).

7. The DC bias-resistant soft magnetic powder core according to claim 1, characterized in that: The top of the fixing piece (5) extends through the bottom and has several circular grooves (502) evenly arranged.

8. A DC bias-resistant soft magnetic powder core according to claim 1, characterized in that: The first fixing ring (3) and the second fixing ring (4) are welded to the fixing piece (5) by laser welding.

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