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Press powder magnetic core and choke using said magnetic core

A technology of powder magnetic core and choke, applied in magnetic core/yoke, transformer/inductor magnetic core, inorganic material magnetic and other directions, can solve the problems of DC superposition characteristics and undisclosed iron loss.

Inactive Publication Date: 2003-09-10
TOKIN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, Japanese Patent Application Publication No. 2-290002 only describes the improvement of initial magnetic permeability and frequency characteristics, and does not disclose the improvement of DC superposition characteristics and iron loss.

Method used

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  • Press powder magnetic core and choke using said magnetic core
  • Press powder magnetic core and choke using said magnetic core
  • Press powder magnetic core and choke using said magnetic core

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0041]The alloy powder composed of 4.5% by weight silicon-0.5% by weight oxygen-1.5% by weight aluminum-the rest is iron, produced by water pulverization, is classified to a particle size of 150 μm or less, and silicon is mixed in a weight ratio of 1.5% by weight as a binder Ketone resins. Then, compression molding was performed using a molding die to form a spiral shape with an outer diameter of 27 mm, an inner diameter of 14 mm, and a height of 18 mm.

[0042] Then, this molded body was placed in an inert atmosphere, kept at 850° C. for 1 hour, and then gradually cooled at room temperature to obtain a dust core. On the dust core, 30 turns of the first turn and 30 turns of the second turn are performed, and the magnetic properties of the magnetic permeability, coercive force, and iron loss at 20kHz and 0.1T are measured with the ST-8232 AC BH detector of Iwasaki Communications. , and the results are shown in Table 1.

[0043] As a comparative example, a high-silicon steel s...

example 2

[0047] The amount of silicon is 0.5, 1.5, 2.5, 3.5, 4.5, 5.5, 6.5, 7.5, 8.5, 9.5% by weight, the amount of oxygen is 0.5±0.1% by weight, and all the compositions are 10% by weight of aluminum, and the rest is iron, A total of 10 types of compositions were used, and the alloy powder was produced by water pulverization method, classified to be less than 150 μm by the same method as in Example 1, added with a binder, and formed into a spiral dust core by a metal mold.

[0048] Then, heat treatment for deformation correction was performed, and the inductance at the time of 26 A DC superposition (12000 A / m) was measured at a frequency of 20 kHz. According to the inductance value, the magnetic permeability when 26A DC is superimposed is calculated. The results are shown in figure 2 . from figure 2 It can be seen that μ is 20 or more in the region where the amount of silicon is 8.0% by weight or less. Then, the iron loss was measured under the conditions of 20kHz and 0.1T, and ...

example 3

[0050] Production of gas pulverized powder with silicon content of 4.5% by weight, aluminum content of 1.0% by weight, and the rest of iron alloy composition, after classification to 150 μm or less, the temperature is kept constant, and the atmosphere is properly adjusted to produce an oxygen content of 0.05, 0.1, 0.25, 0.5, 0.75, 1.0, 1.25% by weight of alloy powder. Then, after mixing these powders with a binder in the same manner as in Examples 1 and 2, helical powder magnetic cores of the same shape were manufactured in exactly the same manner as in Example 2.

[0051] Then, after the heat treatment for deformation correction, these cores were wound in the same manner as in Example 1, and the iron loss was measured under the conditions of 20 kHz and 0.1 T. The results are shown in image 3 . from image 3 It can be seen that when the amount of oxygen is less than 0.1% by weight, the iron loss rapidly deteriorates.

[0052] Then, wind the wire on the dust core with the ...

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Abstract

It is composed of silicon: 3.0-8.0 % in weight, oxygen 0.1-1.0%, Mn, Al, V, Cr and Ti: at least 0-2.0% for one of then (not including zero) and remaining Fe. The alloy powder is prepared with actual size below 150 micro m and mixed with bonding agent to be formed with metal mold by compression, Therefore, magnetic powder core is got with over 20 AC permeability under 12000A / m DC applied magnetic field at 20kH2 1000 KW / m3 core loss property under 20KHz, 0.1T, over 1000G magnetic saturation and lower than 3.00e magnetic retentivity.

Description

technical field [0001] The invention relates to a choke that can be mounted on a switching power supply, and a powder magnetic core suitable for it. Background technique [0002] In recent years, the problem of energy saving and global warming caused by the increase of carbon dioxide gas has become more and more serious, so energy saving measures for general household electrical appliances and industrial machines have been rapidly developed. Generally, appliances that use motors, such as air conditioners and refrigerators, and lighting fixtures, have a high priority for energy-saving measures because they consume a lot of power. [0003] In order to promote the energy saving of such products, it is required to adopt high-efficiency motors and improve the efficiency of circuits. The problem of high power in the circuit is the power supply unit that converts the 50 / 60Hz AC input to DC. In order to improve its efficiency, the popularity of switching power supplies in industria...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00H01F1/22H01F3/08H01F27/24
Inventor 藤原照彦石井政义斋藤义孝
Owner TOKIN CORP
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