JPH0323619B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a wound core with good excitation current characteristics, which is formed by winding a thin plate of high magnetic permeability alloy, and a method for manufacturing the same. For magnetic transfer devices, magnetic amplifiers, DC current detectors, magnetic modulators, etc., wound cores made of, for example, anisotropic 50% Ni permalloy, supermalloy, grain-oriented silicon steel, etc. are used. These conventional wound cores are known for their excellent excitation current characteristics and their steepness to saturation, but in recent years, there has been a demand for excitation with smaller currents, increased saturation voltage, and steeper characteristics to saturation. It is being In addition, among conventional iron cores, especially permalloy iron cores such as 50Ni permalloy and supermalloy, the strain sensitivity of the constituent materials is high, so transportation, transportation, etc.
During winding work, the magnetic properties are significantly deteriorated due to mechanical strain, which has major drawbacks such as impairing the required function as a wound core and electrical balance. In addition, manufacturing these conventional wound core materials requires complex and detailed processes such as melting, ingot-forming, hot rolling, pickling, and cold rolling, so the cost of the wound core is low. It was considered expensive. SUMMARY OF THE INVENTION An object of the present invention is to eliminate the drawbacks of the prior art described above, and to provide a wound core that is excellent in excitation current characteristics, strain sensitivity, and impact resistance, and is less expensive, and a method for manufacturing the same. In order to achieve the above object, the present invention has developed Fe-Co-Si-
It is characterized by using a B-based amorphous alloy thin plate. The inventors of the present application have determined that the formula Fe _d Co _e T _f Si _g B _h (where T is
Be, Mg, Ca, Sr, Ba, Ti, Zr, Hf, V, Nb,
Ta, Cr, Mo, W, Mn, Ru, Ni, Pd, Cu,
Zn, Y, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy
One or more of the following, d+e+f
+g+h=100), especially in the above formula, 72≦d+e≦85, 0.70≦e/d+
e≦0.99, f≦3, 7<g<16, 7<h<10, 15
The present invention was completed based on the discovery that excellent excitation current characteristics can be obtained by constructing a wound core using an amorphous alloy that satisfies the condition ≦g+h≦25, annealed in a magnetic field and cooled. It is. In the present invention, Si and B, which are amorphous forming elements,
If the total is less than 15 atomic % (hereinafter simply referred to as %), it will be difficult to make it amorphous, and if it exceeds 25%, the magnetic flux density will decrease, so it is set to 15 to 25%.
Although other metalloid elements such as C, P, Ge, Bi, and Al are known as amorphous forming elements, the combination of Si and B is superior in terms of thermal stability and toughness. Even if C, P, Ge, Bi, and Al are included, the effects of the present invention will not be significantly impaired, but 5%
The following is desirable. If the content of B is less than 7%, it is difficult to make it amorphous, and if it is more than 10%, the environmental resistance properties, such as moisture resistance,
This is not preferable because the alkali resistance is greatly reduced. If the Si content is less than 7%, thermal stability will be impaired.
If it is 16% or more, Hc becomes 0.1 Oe or more, which is not preferable. The total amount of Fe and Co is 72% to 85%, and if it exceeds 85%, it becomes difficult to make it amorphous, and if it is less than 72%, the magnetic flux density decreases, which is not preferable. Fe generates induced magnetic anisotropy by annealing and cooling in a magnetic field due to interaction with Co.B-H
This has the effect of improving the squareness of the curve and thus increasing the steepness up to saturation in the excitation current characteristics. Also, the ratio of Fe and Co is 0.70≦Co／Fe＋Co≦
The reason why it is limited to 0.99 is that the magnetostriction constant λs cannot be made substantially smaller with any other composition.
Note that the magnetostriction constant is an important constant that governs the soft magnetic properties of an amorphous material, and it is extremely important to make it substantially zero in order to obtain excellent excitation current characteristics. Further, each element indicated by T can be included as an additive element in a total amount of 3% or less. Ti, Zr, Hf,
Addition of a group of V, Nb, Ta, Mo, W, Ni, and Pd improves amorphous formation ability, and Cr and Pd improve corrosion resistance.
Improves moisture resistance. Y, Ce, Pr, Nd, Sm,
A group of Eu, Gd, Tb, and Dy improves hardness, raises crystallization temperature, and increases thermal stability. Be, Mg, Ca, Sr, Ba, and Ru improve the ability to form an amorphous state, and this tendency becomes particularly strong when used in combination with other additive elements. Mn has the effect of lowering Hc. It is necessary that the total amount of these additional elements T be 3% or less in order to guarantee high magnetic flux density. If it exceeds 3%, for example, B ₁₀ tends to decrease rapidly, which is not preferable. An amorphous core material having the above composition range is used as a toroidal core in a DC or AC magnetic field of 10 Oe or more,
By annealing at a suitable temperature between 250°C and 450°C and cooling in a magnetic field at a cooling rate of no more than 300°C per hour, Hc is less than 0.02 Oe, B ₁₀ is less than 8000 G, Br/
B ₁₀ ; A low coercive force of 75% or more, high magnetic flux density, and a high square ratio winding core can be easily obtained. Conventionally, direct current is generally used as the waveform of the magnetic field, but half-wave rectification and alternating current (commercial frequency) also have little effect. The optimal temperature for heat treatment will vary depending on changes in composition, but if it exceeds 450℃, embrittlement will become significant, and
At temperatures below 250°C, stress relaxation by annealing is impossible and has little effect. If the cooling rate in a magnetic field exceeds 300℃/hour, uneven cooling is likely to occur (75%)
Br/B ₁₀ above cannot be obtained. Hereinafter, it will be explained in detail based on examples. Table 1 shows examples of DC magnetism of the amorphous alloy core constituting the wound core of the present invention for conventional supermalloy and 50Ni permalloy. All compositions were manufactured under the heat treatment conditions shown in Table 1 in the DC magnetic field shown in the same table. Moreover, the comparative example is a case where the optimum heat treatment temperature was adopted.

[Table] As is clear from Table 1, the amorphous alloy core constituting the wound core of the present invention exhibits a low coercive force equivalent to or lower than that of supermalloy, and Br/B ₁₀ is 50Ni.
It has the same level of performance as permalloy, and has excellent performance that combines the advantages of conventional materials.
It is clear that it exhibits good excitation current characteristics. Figure 1 shows the excitation current characteristics at 50Hz of wound cores made of alloys No. 2 (3) and No. 16 (4) in Table 1 in comparison with supermalloy (1) and 50Ni permalloy (2). (The numbers in parentheses indicate the numbers in the figure.) The core dimensions of the wound core are: inner diameter 25mmφ, outer diameter 35mmφ, height 5mm, and the number of excitation turns is 15 turns on both the primary and secondary sides. As is clear from Fig. 1, the wound core of the present invention maintains a low excitation magnetomotive force (excitation current) up to a high level of output voltage, and has good linearity during this period, and has excellent excitation characteristics. There is. Table 2 shows the DC squareness ratio Br/of the wound core of the present invention.
B ₁₀ and B _n = 2KG, frequency 100kHz iron loss W ₂ / _100k
The figure shows an example of a comparison between conventional supermalloy and 50Ni permalloy. In each case, each composition was manufactured under the heat treatment conditions shown in Table 2 in a DC magnetic field shown in the same table. Moreover, the comparative example is a case where the optimum heat treatment temperature was adopted.

【table】

[Table] As is clear from Table 2, the wound core according to the present invention has the same squareness ratio as the conventional 50% Ni permalloy, but the iron loss at high frequencies is significantly smaller, and it has a higher squareness ratio than supermalloy, resulting in less iron loss. small. Therefore, the heat generation is smaller than that of the conventional wound core, and the controllability is also equal to or better than that of the conventional wound core. Table 3 shows a comparison of the rate of change in iron loss ΔW after 120 hours when a conventional amorphous amorphous core and an amorphous amorphous core according to the present invention were placed in a constant temperature chamber at a temperature of 80°C and a humidity of 95%. It is a table. Here, ΔW = (W ¹²⁰ ₂ / ₁₀₀ k - W ⁰ ₂ / ₁₀₀ k) / W ⁰ ₂ / ₁₀₀ k However, W ¹²⁰ ₂ / ₁₀₀ k: B _n = 2KG after 120 hours, f = 100k
Iron loss in Hz W ⁰ ₂ / ₁₀₀ k: Initial iron loss at B _n = 2 KG, f = 100 kHz In addition, for each composition, the heat treatment shown in Table 3 in the alternating current magnetic field shown in the same table was applied. This is a case of manufacturing under certain conditions. Moreover, the comparative example is a case where the optimum heat treatment temperature was adopted.

[Table] As is clear from Table 3, the wound core of the present invention is superior to the conventional amorphous wound core in that the characteristics change less even under high temperature environments. As is clear from the above examples, the wound core of the present invention has extremely excellent excitation characteristics, and is excellent as a control wound core for magnetic amplifiers, magnetic phase shifters, DC current detectors, magnetic modulators, etc. It is. Furthermore, because of the strength and toughness inherent in the amorphous alloy of the core material, the wound core of the present invention has low stress sensitivity, excellent impact resistance, and high reliability.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the excitation current characteristics of the wound core of the present invention and the conventional wound core at 50 Hz.

Claims (1)

[Claims] 1. In a wound core formed by winding a high magnetic permeability alloy thin plate, the alloy thin plate has a composition formula Fe _d
Co _e Si _g B _h (where d+e+g+h=100, 72≦d
+e≦85, 0.70≦e/(d+e)≦0.99, 7<g
<16, 7<h<10, 15≦g+h≦25)
A wound core characterized by using a Fe-Co-Si-B amorphous alloy thin plate. 2. In a wound core formed by winding a high magnetic permeability alloy thin plate, the alloy thin plate has a composition formula Fe _d
Co _e T _f Si _g B _h (where T is Be, Mg, Ca, Sr, Ba,
Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W,
Mn, Ru, Ni, Pd, Cu, Zn, Y, Ce, Pr, Nd,
One or more of Sm, Eu, Gd, Tb, Dy, d+e+f+g+h=100, 72≦d+e≦
85, 0.70≦e/(d+e)≦0.99, f≦3, 7<
A wound core characterized in that it uses an Fe-Co-Si-B amorphous alloy thin plate having the following relationships: g<16, 7<h<10, 15≦g+h≦25). 3 Composition formula Fe _d Co _e Si _g B _h (in the formula, d+e+g+h
=100, 72≦d+e≦85, 0.70≦e/(d+e)≦
0.99, 7<g<16, 7<h<10, 15≦g+h≦
25) Fe-Co-Si-B amorphous alloy
In a DC or AC magnetic field of 10 oersted or more
Annealed between 250℃ and 450℃, hourly
A method for manufacturing a wound iron core, characterized in that a thin alloy plate with high magnetic permeability is formed by cooling in a magnetic field at a cooling rate of 300°C or less, and the thin plate is wound. 4 Composition formula Fe _d Co _e T _f Si _g B _h (where T is Be, Mg,
Ca, Sr, Ba, Ti, Zr, Hf, V, Nb, Ta, Cr,
Mo, W, Mn, Ru, Ni, Pd, Cu, Zn, Y, Ce,
One or more of Pr, Nd, Sm, Eu, Gd, Tb, Dy, d+e+f+g+h=100, 72
≦d+e≦85, 0.70≦e/(d+e)≦0.99, f
≦3, 7<g<16, 7<h<10, 15≦g+h≦
25) Fe-Co-Si-B amorphous alloy shown in
In a DC or AC magnetic field of 10 oersted or more
Annealed between 250℃ and 450℃, hourly
A method for manufacturing a wound iron core, characterized in that a thin alloy plate with high magnetic permeability is formed by cooling in a magnetic field at a cooling rate of 300°C or less, and the thin plate is wound.