JPH0123926B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wound core having good excitation current characteristics, which is formed by winding a thin plate of a high magnetic permeability alloy, and a method for manufacturing the same. For magnetic phase shifters, magnetic amplifiers, DC current detectors, magnetic modulators, etc., wound cores made of, for example, anisotropic 50Ni permalloy, supermalloy, grain-oriented silicon steel, etc. are used. These conventional wound cores are known for their excellent excitation current characteristics and their steepness until saturation. It has been demanded. 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.
It has major drawbacks such as significant deterioration of magnetic properties due to mechanical strain during winding work, impairing the required function as a wound core and electrical balance. In addition, manufacturing these conventional wound core constituent materials requires complex and detailed processes such as melting, ingot-forming, hot rolling, pickling, and cold welding, which reduces the cost of the wound core. It was considered expensive. SUMMARY OF THE INVENTION An object of the present invention is to eliminate the drawbacks of the above-mentioned conventional techniques, 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. The inventors of the present application have determined that the formula Fe _d Co _e T _f Si _g B _h (where T is
Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W,
An amorphous alloy of one or more of Mn, Ni, and Pd, represented by d+e+f+g+h=100), especially in the above formula, 0≦f≦3, 72≦
d+e≦85, 7≦g<16, 7≦h<10, 15≦g+
Heat treating an amorphous alloy that satisfies the condition h≦25,
In particular, the inventors have discovered that excellent excitation current characteristics can be obtained by constructing a wound core using a core that has been heat-treated in a magnetic field and cooled, thereby completing the present invention. 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 the best 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
It is desirable that it is 5% or less. 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%, the thermal stability will be impaired, and if it is more than 16%, the Hc will be 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. Co causes induced magnetic anisotropy due to annealing and cooling in a magnetic field through interaction with Fe, which has the effect of increasing the squareness of the BH curve and, therefore, the steepness of the excitation current characteristics up to saturation. has. Further, each element indicated by T can be included as an additive element. Ti, Zr, Hf, V, Nb, Ta,
Addition of a group of Mo, W, Mn, Ni, and Pd improves amorphous formation ability, and Cr and Pd improve corrosion resistance and moisture resistance. Mn has the effect of lowering Hc. The total amount of these additional elements T is preferably 10% or less in order to ensure high magnetic flux density. If it exceeds 10%, for example, _B10 tends to decrease rapidly, which is not preferable. Hc Less than 0.09Oe at B ₁₀
At 12,000G, a low coercive force, high magnetic flux density, and high square ratio core with Br/B ₁₀ of 75% or more can be easily obtained. Conventionally, direct current is generally used as the magnetic field, but
Even with half-wave rectification and alternating current (commercial frequency), the effect hardly decreases. The optimal temperature for heat treatment will vary depending on composition changes, 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 occur75
Br/B ₁₀ of % or more cannot be obtained. Hereinafter, a detailed explanation will be given 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. This is the case when the optimum heat treatment temperature is adopted for any composition. As is clear from Table 1, the amorphous alloy core constituting the wound core of the present invention exhibits a low coercive force equal to or lower than that of supermalloy, with B ₁₀ and Br/B ₁₀
It is clear that this material has the same level as 50Ni permalloy, has excellent performance that combines the advantages of conventional materials, and exhibits good excitation current characteristics. Figure 1 shows alloys No. 2 (3) and No. 11 (4) in Table 1.
The excitation current characteristics at 50 Hz of the wound core made of the following are shown in comparison with those of supermalloy (1) and 50Ni permalloy (2) (numerals 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. As is clear from the above examples, the excitation characteristics of the wound core of the present invention are extremely excellent, and the magnetic amplifier,
It is excellent as a control wound core for magnetic phase shifters, DC current detectors, magnetic modulators, etc. 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. 【table】

[Brief explanation of drawings]

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. A wound core formed by winding a high magnetic permeability alloy thin plate, the composition of which is: Fe _d Co _e Si _g B _h , where d+e+g+h=100 72≦d+e≦85, 7 A wound iron core characterized in that it is made by winding Fe--Co--Si--B based amorphous alloy thin plates expressed by ≦g<16, 7≦h<10, 15≦g+h≦25. 2. In a wound core formed by winding a high permeability alloy thin plate, its composition is as follows: Fe _d Co _e T _f Si _g B _h , where T=(Ti, Zr, Hf, V, Nb,
Ta, Cr, Mo, W, Pd, Ni, Mn) d+e+f+g+h=100, 0<f≦
3, 72≦d+e≦85, 7≦g<16, 7≦h
A wound iron core characterized in that it is made by winding Fe-Co-Si-B amorphous alloy thin plates expressed by <10, 15≦g+h≦25. 3 Its composition is: Composition formula: Fe _d Co _e Si _g B _h However, d+e+g+h=100 72≦d+e≦85, 7≦g<16, 7≦h
A method for manufacturing a wound iron core, which comprises winding an Fe--Co--Si--B amorphous alloy thin plate expressed by <10, 15≦g+h≦25 and then heat-treating the sheet. 4. In the method for manufacturing a wound core according to claim 3, the heat treatment includes annealing in a magnetic field between 250°C and 450°C, and cooling in the magnetic field at a cooling rate of 300°C or less per hour. A method of manufacturing a wound iron core characterized by subjecting it to. 5 Its composition is: Composition formula: Fe _d Co _e T _f Si _g B _h However, T = (Ti, Zr, Hf, V, Nb,
Ta, Cr, Mo, W, Pd, Ni, Mn) d+e+f+g+h=100, 0<f≦
3, 72≦d+e≦85, 7≦g<16, 7
1. A method for manufacturing a wound core, which comprises winding an Fe--Co--Si--B amorphous alloy thin plate represented by ≦h<10, 15≦g+h≦25, and then heat-treating the sheet. 6. In the method for manufacturing a wound core according to claim 5, annealing is performed in a magnetic field between 250°C and 450°C as the heat treatment, and cooling in the magnetic field is performed at a cooling rate of 300°C or less per hour. A method of manufacturing a wound iron core characterized by subjecting it to.