JPS62226602A - High space factor low loss amorphous magnetic core - Google Patents

Abstract

PURPOSE:To obtain a high space factor and low loss magnetic core by winding an alloy thin belt formed by the single side cooling of a definite composition formula material wherein essential elements are Mo and W. CONSTITUTION:An amorphous alloy thin belt 5-15mum thick is made by single side cooling using the material shown by a composition formula wherein T is Co or Fe and 0.3<=W<=3, 0.2<=x<=2, 10<=y<=18, 8=z=9.5. A magnetic core is made by wiring the thin belt with tension of 1 x 10<7> Pa or more. This constitution enbet obtaining a high space factor and low loss magnetic core since a good surface roughness alloy thin belt can be obtained.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is a low-loss transformer with a high space factor suitable for high-frequency transformers, saturable reactors, chokes, etc. used in high frequencies, particularly in the frequency range where 100 KI (z) is recommended. It concerns an amorphous magnetic core.

[Conventional technology]

Conventionally, ferrite cores have been mainly used as magnetic cores used in frequency regions exceeding 100 KHz.

In recent years, amorphous magnetic cores have attracted attention and are beginning to be applied to various applications. By the way, switching power supplies tend to have higher frequencies in order to be miniaturized, and magnetic components are also required to have even lower loss in the high frequency range. Amorphous magnetic cores have a low loss compared to conventional permalloy magnetic cores, etc., but at frequencies 91)' of several hundred KILz or more, the loss increases, so it is necessary to make the thickness of the ribbon thinner.

[Problem that the invention seeks to solve]

However, the above-mentioned conventional amorphous magnetic core has a high frequency, especially 1
When manufacturing by a single roll method etc. to reduce eddy current in the frequency band where 00KHz disappears, if the thickness of the amorphous ribbon is made thinner, the surface roughness of the ribbon deteriorates and the space factor decreases after it is made into a magnetic core. It has some problems. For this reason, even if you try to increase the frequency and reduce the volume of the magnetic core, the size will not be as small as expected.

An object of the present invention is to provide a magnetic core with a high space factor and low loss using an amorphous alloy ribbon of a specific composition and good surface roughness manufactured by a single-sided cooling method.

[Means for solving problems]

The present invention is based on the composition formula % where T is at least one element selected from Co and Fe, and 0.3≦W≦3.0.2≦X≦2.10≦y≦18.8
This is a low-loss amorphous magnetic core with a high space factor and made of an amorphous alloy ribbon manufactured by a single-sided cooling method having the relationship of ≦Z≦9.5.

In the present invention, Mo and W are essential elements, and the amount of Mo w
, W amount X has the following relationship, it is easy to produce an amorphous ribbon with good surface roughness.

0.3 ≦W ≦3. You can get the following.

10% limited the SL amount y to 10% or more and 18% or less
This is because if it is less than 18%, it is difficult to achieve low loss, and if it exceeds 18%, the amorphous ribbon becomes brittle.

B fJ z was limited to 8% or more and 9.5% or less
If it is less than 9.5%, the core loss will increase, and if it exceeds 9.5%, it will tend to react with the nozzle during production of the ribbon, resulting in poor surface roughness of the amorphous alloy ribbon.

In addition, when increasing the space factor of the wound core, I
It is desirable to wind with a tension of α or more, in which case a high space factor can be achieved.

Further, in some cases, interlayer insulation may be provided with a thickness that does not significantly affect the decrease in space factor. Does interlayer insulation cause fine oxide powder to be attached to the surface?

This is done by forming an oxide film on the surface through chemical treatment.

〔Example〕

The present invention will be explained below according to examples.

Example 1 An amorphous alloy ribbon with an average thickness of 8 μm and a width of 10 mm was produced by a single roll method, and an outer diameter of 19 m and an inner diameter of 15 an.
It was wound under tension of Xlo'Pα and heat-treated in a nitrogen atmosphere. Space factor of the obtained magnetic core 1 frequency 200
When the core loss of KIL, t3+++ 2kG was measured, the results shown in the table below were obtained.

As can be seen from the table below, the amorphous magnetic core according to the present invention has a higher space factor and lower core loss than conventional amorphous magnetic cores, and is suitable for miniaturizing the magnetic core by increasing the frequency.

Example 2 Figure 1 shows an F with an average thickness of 8 pm manufactured by a single roll method.
876,5- z M 01 W z S 113,
FIG. 3 is a diagram showing the space factor of a wound core made from a 58 g amorphous ribbon.

If the W amount X is less than 0.2% or more than 2%, the surface roughness of the ribbon deteriorates and the space factor of the magnetic core decreases. Therefore, the amount of W
is preferably 0.2% or more and 2% or less.

Example 3 Figure 2 shows an F with an average thickness of 8 μm manufactured by a single roll method.
eta, s-W Mow WI S 113.5 B
97 is a diagram showing the space factor of a wound core made from a 97 mm/L/7 as thin ribbon.

If the MO amount W is less than 0.3% or more than 3%, the surface roughness of the ribbon will deteriorate and the space factor of the magnetic core will decrease.
The O amount W is preferably 0.3% or more and 3% or less.

Example 4 Figure 3 shows Fe73 of the present invention produced by a single roll method.
, 5 M 02 W 2 S 113.58 g Magnetic core A made from amorphous ribbon and conventional Fe, 5i9B
□ is a diagram showing the thickness dependence of the space factor of a magnetic core B made from an amorphous ribbon.

It can be seen that the difference in space factor between the magnetic core of the present invention and the conventional magnetic core is particularly significant in the range of plate thickness from 5 μm to 15 μm. As described above, the magnetic core of the present invention is particularly excellent as a magnetic core used at a frequency of several 100 KHz where the plate thickness must be reduced.

Example 5 FIG. 4 is a diagram showing the change in space factor when the winding tension is changed when producing a wound magnetic core according to the present invention.

If the tension is less than 1X107Pα, the space factor decreases significantly, so it is more desirable that the tension is 1X107Pα or more.

〔Effect of the invention〕

According to the present invention, it is possible to suppress the decrease in the space factor of the amorphous magnetic core due to deterioration of the surface roughness of the amorphous ribbon, which has been insufficient in the past, and to obtain a low-loss magnetic core. can achieve miniaturization.

[Brief explanation of drawings]

Figure 1 shows F with an average thickness of 8 μm manufactured by the single roll method.
Er! , s-x MOtWx 5113. A diagram showing the space factor of a wound core made from S Bs amorphous ribbon,
Figure 2 shows F with an average thickness of 8 μm manufactured by the single roll method.
ers, s-v Moy wIS 14i, s B
FIG. 3 is a diagram showing the space factor of a wound magnetic core made from an amorphous ribbon made from F e7.9 amorphous ribbon according to the present invention. ,, Mo2W
2 is a diagram showing the thickness dependence of the space factor of a magnetic core made from a 2sL3.5Bs amorphous ribbon and a magnetic core made from a conventional Fe7s S Ig B lx amorphous ribbon. FIG. 4 is a diagram showing changes in the space factor depending on the winding tension.

Claims (3)

[Claims] (1) Composition formula T_1_0_0_-_w_-_x_-_y_-_zMo
It is represented by _wWxSi_yB_z, where T is at least one element selected from Co and Fe, and 0.3≦w≦3, 0.2≦x≦2, 10≦y≦18, 8
A low-loss amorphous magnetic core with a high space factor, characterized by being made of an amorphous alloy ribbon produced by a single-sided cooling method having the relationship of ≦z≦9.5. (2) The thickness of the amorphous alloy ribbon is from 5μm to 15μm
2. A low-loss amorphous magnetic core with a high space factor as claimed in claim 1, characterized in that the space factor is between m. (3) A low-loss amorphous magnetic core with a high space factor as claimed in claim 1 or 2, characterized in that it is made of an amorphous alloy ribbon wound with a tension of 1×10^7 Pa or more.