magnetic core
A magnetic core and soft magnetic technology, applied in the direction of magnetic core/yoke, transformer/inductor magnetic core, magnetic objects, etc., can solve the problems such as the difficulty of miniaturization of the magnetic core
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Embodiment 1～8、 comparative example 1～2
[0073] Iron-based amorphous alloy thin strips were produced by chilled roll extrusion. By changing the conditions of the chilled roll extrusion method, the average thickness and Ks were changed. Through this work, iron-based amorphous alloy sheets of samples 1 to 4 were prepared. The average thickness and Ks of the iron-based amorphous alloy sheet are as shown in Table 1. The crystallization temperatures of samples 1 to 4 were 500°C to 515°C.
[0074] [Table 1]
[0075]
[0076] Next, an insulating layer was formed on the surface of the iron-based amorphous alloy plate. For Examples 1 to 8 and Comparative Example 1, as shown in Table 2, silicon oxide (SiO 2 ), magnesium oxide (MgO) or aluminum oxide (Al 2 o 3 ) insulating particles and an insulating layer was formed by the above-mentioned method. In Comparative Example 2, a resin paste was applied to the surface of the alloy plate of Sample 1 to form an insulating layer. Table 2 shows the material, average particle ...
Embodiment 9
[0098] (Example 9, Comparative Example 3)
[0099] A magnetic core was produced as Comparative Example 3, which was the same as Comparative Example 1 except that the outer diameter was 37 mm×the inner diameter was 23 mm×the width was 15 mm. In addition, a magnetic core was produced as Example 9, which was the same as Example 7 except that the magnetic core was set to the same size (37 mm outer diameter x 23 mm inner diameter x 15 mm width). The initial magnetic permeability μ at a frequency of 100 kHz was 17,000 in Comparative Example 3 and 35,000 in Example 9.
[0100] The L value of the magnetic core in which 8 turns of the wire was wound on the magnetic core of Comparative Example 3 was 1.2 mH. On the other hand, the L value of the magnetic core wound with 6 turns of the wire of Example 9 was 1.4 mH. In the case of the same core size, Example 9, which has a large initial magnetic permeability μ at a frequency of 100 kHz, has a large L value even though the number of windi...
Embodiment 10、 comparative example 4
[0102] A magnetic core of Comparative Example 4 (outer diameter 37 mm×inner diameter 23 mm×width 15 mm, number of windings 8 turns, L value 1.2 mH) was prepared. A magnetic core was manufactured as Example 10, except that the core size of Example 9 (initial permeability μ at 100 kHz frequency was 35,000) was changed so that the L value of the wound core became the same as 1.2 mH. Other than that, it is the same as in Example 9. The size of the magnetic core in Example 10 is 29 mm in outer diameter x 23 mm in inner diameter x 15 mm in width, realizing miniaturization. The mass of the magnetic core of Comparative Example 4 was 57 g, whereas that of Example 10 was 21 g. It can be seen that when the initial magnetic permeability μ at a frequency of 100 kHz is increased in this way, miniaturization can be achieved if the same performance is required.
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