Powder magnetic core

Abstract

The utility model discloses a powder magnetic core which comprises a body, the body is formed by combining an inner-ring magnetic core, a middle-ring magnetic core and an outer-ring magnetic core, the inner-layer magnetic core, the middle-layer magnetic core and the outer-layer magnetic core of the body are all of an annular structure, and the inner-ring magnetic core, the middle-ring magnetic core and the outer-ring magnetic core are combined into one layer. According to the utility model, by designing the combined structure of the inner-ring magnetic core, the middle-ring magnetic core and the outer-ring magnetic core, the inner-ring magnetic core is made of a high-magnetic-conductivity material, and the outer-ring magnetic core is made of a low-loss material, so that the magnetic cores can play the advantages of respective materials in different areas, and the magnetic cores are more stable in performance due to the circular-ring-shaped structure and the multi-layer combined mode. Compared with a traditional simple geometrical shape, a magnetic circuit is more reasonable, a plurality of magnetic circuit channels are formed by the multi-layer structure, distribution of magnetic lines of force can be better guided, the magnetic circuit is further optimized, the magnetic leakage phenomenon is reduced, and the magnetic coupling efficiency of the magnetic core is improved.

Description

Technical Field

[0001] This utility model relates to the field of magnetic core technology, specifically to a pressed powder magnetic core. Background Technology

[0002] Powder cores are magnetic components made by mixing magnetic powder with an insulating medium and then pressing and heat-treating them. They are widely used in electronic devices.

[0003] Traditional pressed powder magnetic cores employ simple geometric shapes, such as toroidal or E-shaped cores, resulting in an inefficient magnetic circuit distribution. This leads to uneven distribution of magnetic field lines within the core, with localized areas of excessively high or low magnetic flux density. Consequently, the overall magnetic properties of the core are affected, increasing hysteresis and eddy current losses. Existing pressed powder magnetic cores also typically lack effective heat dissipation structures. Under high-power or high-frequency operating conditions, the core generates a significant amount of heat, which is difficult to dissipate quickly. Prolonged heat accumulation causes the core temperature to rise, leading to decreased permeability, increased losses, and other problems, severely impacting the core's performance and lifespan. For example, pressed powder magnetic cores used in switching power supplies often require additional cooling devices due to poor heat dissipation, increasing system cost and size.

[0004] Therefore, it is necessary to invent a pressed powder magnetic core to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a pressed powder magnetic core to address the aforementioned shortcomings in the technology.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a pressed powder magnetic core, comprising a body, wherein the body is composed of three parts: an inner magnetic core, a middle magnetic core, and an outer magnetic core. The inner, middle, and outer magnetic cores of the body are all circular ring structures, and the inner, middle, and outer magnetic cores are combined into one layer.

[0007] The body adopts a multi-layer structure, with mica sheets laid between each layer of the body. Each part of the body has several heat dissipation holes, and the outer wall of the outer ring magnetic core of the body has several protrusions. High-strength fibers are uniformly mixed into the pressed powder of the body.

[0008] As a preferred embodiment of this utility model, an inner magnetic core is nested outside the inner magnetic core, and an outer magnetic core is nested outside the middle magnetic core. The inner magnetic core is made of a high permeability material, and the outer magnetic core is made of a low-loss material.

[0009] As a preferred embodiment of this utility model, a plurality of heat dissipation holes are evenly distributed on the inner ring magnetic core, the middle ring magnetic core and the outer ring magnetic core, and the plurality of heat dissipation holes are evenly distributed vertically on the body.

[0010] As a preferred embodiment of this utility model, a plurality of the protrusions are evenly distributed at equal intervals on the outside of the outer ring magnetic core, and each of the protrusions is hemispherical, with a height of 0.5-1mm and a diameter of 1-2mm.

[0011] The technical effects and advantages provided by this utility model in the above technical solution are as follows:

[0012] 1. By designing a structure combining an inner core, a middle core, and an outer core, with the inner core made of a high-permeability material and the outer core made of a low-loss material, this design allows the core to leverage the advantages of each material in different areas. The ring structure and multi-layer combination result in a more rational magnetic circuit compared to traditional simple geometric shapes. The multi-layer structure forms multiple magnetic circuit channels, which can better guide the distribution of magnetic lines of force, further optimize the magnetic circuit, reduce magnetic leakage, and improve the magnetic coupling efficiency of the core. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0014] Figure 1 This is a perspective view of the overall structure of this utility model;

[0015] Figure 2 This is a cross-sectional view of the overall structure of this utility model;

[0016] Figure 3 This is a cross-sectional view of the overall structure of this utility model;

[0017] Figure 4 This is an exploded view of the main body of this utility model.

[0018] Explanation of reference numerals in the attached figures:

[0019] 1. Body; 11. Inner ring magnetic core; 12. Middle ring magnetic core; 13. Outer ring magnetic core; 2. Mica sheet; 3. Heat dissipation holes; 4. Protrusion. Detailed Implementation

[0020] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0021] This utility model provides, for example Figure 1-4The powder core shown includes a body 1, which is composed of three parts: an inner core 11, a middle core 12, and an outer core 13. The inner, middle, and outer cores of the body 1 are all circular ring structures, and the inner core 11, the middle core 12, and the outer core 13 are combined into one layer.

[0022] In this example, the inner core 11, as the inner layer of the magnetic core, works in conjunction with the middle core 12 and the outer core 13 to form a reasonable magnetic circuit. Its annular structure provides a relatively concentrated path for the magnetic lines of force, making their distribution more uniform within the core and avoiding the problem of excessively high or low local magnetic flux density found in traditional cores, thus improving the overall magnetic performance of the core. The middle core 12, located between the inner core 11 and the outer core 13, serves as a transition and synergistic element. It works in conjunction with the inner and outer cores to further optimize the magnetic circuit distribution. Through reasonable permeability and size design, the middle core 12 can effectively adjust the distribution of magnetic lines of force, making them more uniformly distributed within the core and reducing hysteresis and eddy current losses. In this multi-layered core, the close nesting of the middle core 12 with the inner core 11 and the outer core 13 increases the overall structural stability of the core. This nested structure allows the parts of the magnetic core to support each other when subjected to external impacts or vibrations, reducing the risk of magnetic performance degradation due to structural loosening.

[0023] The main body 1 adopts a multi-layer structure. Mica sheets 2 are laid between each layer of the main body 1. Several heat dissipation holes 3 are opened in each part of the main body 1. Several protrusions 4 are provided on the outer wall of the outer ring magnetic core 13 of the main body 1. High-strength fibers are uniformly mixed into the pressed powder of the main body 1.

[0024] In this example, mica sheets 2 are laid between each layer of the body 1, providing excellent insulation and effectively isolating the electrical connections between the magnetic core layers, preventing electrical faults such as interlayer short circuits. Simultaneously, mica sheets 2 also possess thermal insulation properties, which can, to some extent, prevent heat transfer between layers, helping to disperse heat and avoid localized overheating, thereby improving the thermal stability of the magnetic core. High-strength fibers are uniformly mixed into the pressed powder of the body 1, filling the spaces between magnetic powder particles and enhancing the internal structural strength of the magnetic core. When the magnetic core is subjected to external impact or vibration, the high-strength fibers can disperse stress, preventing cracking or damage, thus improving the mechanical stability and durability of the magnetic core.

[0025] Furthermore, in the above technical solution, the inner magnetic core 11 is nested with a middle magnetic core 12, and the middle magnetic core 12 is nested with an outer magnetic core 13. The inner magnetic core 11 is made of a high permeability material, and the outer magnetic core 13 is made of a low loss material.

[0026] In this example, the inner core 11 is made of a high-permeability material, capable of generating a large magnetic flux under relatively low magnetic field strength. This allows the inner core 11 to effectively guide and concentrate magnetic field lines, enhancing the overall magnetic performance of the core. In electronic devices, such as transformers or inductors, the high-permeability inner core 11 helps improve the energy conversion efficiency and reduce energy loss. The outer core 13 is made of a low-loss material, effectively reducing energy loss during core operation. Under high-power or high-frequency operating conditions, the low-loss characteristics of the outer core 13 can reduce core heating, improving core efficiency and stability. This is significant for extending the lifespan of the core and improving the performance of electronic devices.

[0027] Furthermore, in the above technical solution, a number of heat dissipation holes 3 are evenly distributed on the inner ring magnetic core 11, the middle ring magnetic core 12, and the outer ring magnetic core 13. These heat dissipation holes 3 are vertically and evenly distributed on the body 1. These holes 3 significantly increase the heat dissipation area of ​​the magnetic core and provide channels for air circulation. When the magnetic core generates heat during operation, air can flow through the heat dissipation holes 3 inside the magnetic core, carrying away the heat and effectively reducing the temperature of the magnetic core. This is particularly important for magnetic cores operating under high power or high frequency conditions, preventing problems such as decreased permeability and increased losses due to heat accumulation, and ensuring the stable performance of the magnetic core.

[0028] Furthermore, in the above technical solution, a number of protrusions 4 are evenly distributed at equal intervals on the outside of the outer ring magnetic core 13. Each of the protrusions 4 is hemispherical, with a height of 0.5-1mm and a diameter of 1-2mm.

[0029] In this example, these protrusions 4 significantly increase the heat dissipation surface area of ​​the outer ring magnetic core 13. When the magnetic core generates heat during operation, the protrusions 4 enhance the turbulence effect of airflow, accelerate heat dissipation, and prevent the magnetic core temperature from becoming too high due to heat accumulation. In addition, as the outer layer of the magnetic core, the outer ring magnetic core 13 can also provide a certain degree of protection for the inner ring magnetic core 11 and the middle ring magnetic core 12, reducing the impact of external factors on the internal magnetic core.

[0030] The working process of the powder-pressed magnetic core provided by this utility model is as follows:

[0031] When the electronic device is powered on, current flows through the circuit associated with the pressed powder core, generating a magnetic field inside the core. The inner core 11, made of a high-permeability material, can generate a large magnetic flux even with a relatively small magnetic field strength, effectively guiding and concentrating magnetic field lines. The middle core 12, located between the inner core 11 and the outer core 13, acts as a transition and synergistic element, working in conjunction with the inner and outer cores to further optimize the magnetic circuit distribution, resulting in a more uniform distribution of magnetic field lines within the core. The outer core 13, made of a low-loss material, effectively reduces energy loss while ensuring the integrity of the magnetic circuit. Through the combined action of the inner, middle, and outer cores, a rational magnetic circuit is formed, avoiding the problem of excessively high or low local magnetic flux density found in traditional cores, improving the overall magnetic performance of the core, and increasing the energy conversion efficiency of the equipment.

[0032] Under high-power or high-frequency operating conditions, the magnetic core generates a significant amount of heat due to hysteresis and eddy current losses. In this situation, the heat dissipation holes 3 and protrusions 4 play crucial roles. The heat dissipation holes 3 are evenly distributed vertically on the inner core 11, middle core 12, and outer core 13, providing channels for airflow. Air can flow through the heat dissipation holes 3 within the magnetic core, carrying away heat. Simultaneously, the hemispherical protrusions 4 on the outer wall of the outer core 13 are evenly spaced, greatly increasing the heat dissipation surface area and enhancing the turbulence effect of airflow, accelerating heat dissipation. Furthermore, the mica sheets 2 between each layer provide insulation, helping to disperse heat and prevent localized overheating. Through the synergistic effect of these heat dissipation structures, the temperature of the magnetic core is effectively reduced, preventing problems such as decreased permeability and increased losses due to heat accumulation, thus ensuring the stability of the magnetic core's performance and its service life.

[0033] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A pressed powder magnetic core, comprising a body (1), characterized in that: The body (1) is composed of three parts: an inner magnetic core (11), a middle magnetic core (12) and an outer magnetic core (13). The inner, middle and outer magnetic cores of the body (1) are all circular ring structures. The inner magnetic core (11), the middle magnetic core (12) and the outer magnetic core (13) are combined into one layer. The body (1) adopts a multi-layer structure. Mica sheets (2) are laid between each layer of the body (1). Several heat dissipation holes (3) are opened in each part of the body (1). Several protrusions (4) are provided on the outer wall of the outer ring magnetic core (13) of the body (1). High-strength fibers are uniformly mixed into the pressed powder of the body (1).

2. The pressed powder magnetic core according to claim 1, characterized in that: The inner magnetic core (11) is nested with a middle magnetic core (12), and the middle magnetic core (12) is nested with an outer magnetic core (13). The inner magnetic core (11) is made of a high permeability material, and the outer magnetic core (13) is made of a low loss material.

3. The pressed powder magnetic core according to claim 1, characterized in that: Several heat dissipation holes (3) are evenly distributed on the inner ring magnetic core (11), the middle ring magnetic core (12) and the outer ring magnetic core (13), respectively, and the several heat dissipation holes (3) are evenly distributed vertically on the body (1).

4. The pressed powder magnetic core according to claim 1, characterized in that: Several protrusions (4) are evenly distributed at equal intervals on the outside of the outer ring magnetic core (13). Each of the protrusions (4) is hemispherical, with a height of 0.5-1 mm and a diameter of 1-2 mm.

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