JPS58100659A - Wound iron core - Google Patents

Abstract

PURPOSE:To obtain a wound iron core having superior energizing current characteristics by winging a sheet of an Fe-Co-Si-B alloy having high magnetic permeability and a specified composition. CONSTITUTION:An amorphous alloy is provided with a composition represented by the formula[where T is 1 or >=2 kinds of elements selected from 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 and Dy, d+e+f+g+h=100, 72<=d+e<=85, 0.7<=e/(d+ e)<= 0.99, 0<=f<=3, 7<g<16, 7<h<10 and 15<=g+h<=25]. The amorphous allly is annealed at 250-450 deg.C in a DC or AC magnetic field with >=10 Oe intensity and cooled at <=300 deg.C/hr cooling rate in the magnetic field. The resulting alloy is formed into a sheet and the sheet is wound to obtain a wound core.

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 high magnetic permeability alloy thin plate.

For magnetic phase shifters, magnetic amplifiers, DC current detectors, magnetic modulators, etc., wound cores made of, for example, anisotropic SO%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 until saturation.
A steep IV characteristic that reaches saturation is required.

In addition, among conventional iron cores, especially permalloy iron cores such as 5oNi permalloy and supermalloy, the magnetic properties due to mechanical strain during transportation, transportation, winding, etc. are high due to the high strain sensitivity of the constituent materials. It has major drawbacks, such as significant deterioration of the core, impairing the required functions as a wound core and electrical balance. In addition, K to manufacture these conventional wound core constituent materials requires complicated and detailed processes such as melting, ingot formation, hot rolling, pickling, and cold rolling, which makes the wound core less expensive. It was considered expensive.

The object of the present invention is to eliminate the drawbacks of the above-mentioned prior art and to provide a wound core that is excellent in excitation current characteristics, strain sensitivity, and impact resistance, and is less expensive.

In order to achieve the above object, the present invention is characterized in that an Fe-Co-8t-B based amorphous alloy thin plate is used as a high magnetic permeability alloy thin plate constituting the wound core.

The inventors have developed the formula F @ 4 CO @ T (S i
g B h (in the formula, T is Be, Mg, 0m%8rSB
a%Ti, Zr, Hf, V, Nb.

Ta% Cr, Me, W, Mn% Ru, NiS Pd
, Cu, Zn, Y.

Co, Pr, Nd, amlEts, G (1%Tb,
D7 One or more of the following, d+・
+f+g+h=100), especially in the above formula, 72≦d+・≦85, (L70≦−/d
10, ≦α99, O≦f≦5.7 (g (16,7(h
(We discovered that excellent excitation current characteristics can be obtained by constructing a wound core using an amorphous alloy that satisfies the following conditions: 10,15≦g1h≦25, annealed in a magnetic field and cooled. This completes the present invention.

In the present invention, if the total of Sl and B, which are amorphous forming elements, is less than 15 atoms (hereinafter simply referred to as -), it is difficult to form the amorphous state itself. ), if it exceeds 2s%, the magnetic flux density will decrease, so it is set to 15 to 25-. Other metalloid elements as amorphous forming elements, such as C, P, G@, Bi
, ml are known, but the combination of 81 and B is superior in terms of thermal stability and toughness. C%P, G.,B
Although the effects of the present invention are not significantly impaired even if AI is contained, it is desirable that the content be 5- or less.

If the B content is less than 7q4, it is difficult to make it amorphous;
If it is 0- or higher, the environmental resistance properties, such as moisture resistance and alkali resistance, will be greatly reduced, which is not preferable.

If the content of 81 is less than 7%, the thermal stability will be impaired, and if the content is more than 16%, the He content will be less than 110%, which is not preferable.

The sum of F and Co is between 72 and 85. If it exceeds 85%, amorphization becomes difficult, and if it is less than 72%, the magnetic flux density decreases (ToJ), which is not preferable.

F generates magnetic anisotropy through annealing and cooling in a magnetic field through interaction with Co, improves the squareness of the B-H-clad, and therefore improves the excitation current characteristics up to saturation. It has the effect of creating steepness.

First, the ratio of F@ and Co is a70≦C9//Fe+CO
≦α! The reason why it is limited to 9 is that the magnetostriction constant λl cannot be made substantially smaller with a composition other than this.

Incidentally, the magnetostriction constant is an important constant that governs the soft magnetic properties of an amorphous material, and making it substantially zero is extremely superimposed in order to obtain excellent excitation current characteristics.

9. It is possible to contain the total amount of each element shown as an additive element in a total amount of st4 or less. TI, Zr, Hf.

The addition of V, Nb, Ta, Mo, W, Nl, and Pd improves the amorphous formation ability, and Cr and Pd improve corrosion resistance and moisture resistance. Y%CI, Pr, Nd
%8mSgu.

The group Gd%Tb%D7 improves hardness and increases crystallization temperature and thermal stability. B., Mg
, Ca, 8r, Ba, and Ru improve the ability to form an amorphous state, and this tendency is particularly enhanced when used in combination with other additive elements. Mn has the effect of lowering He. It is not preferable that the total amount of these additional elements T be less than s%.

An amorphous core material having the above composition range is formed into a toroidal core and annealed in a direct current or alternating current magnetic field of 100 °C or more at an appropriate temperature between 250 °C and 450 °C, and at a cooling rate of 500 °C or less per hour in the magnetic field. Cool in the cell (LO).
20. Below, B. So 8000Q.

/ih * 75 Low coercive force, high magnetic flux density,
A high-angle 1/1-inch 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 optimum temperature for heat treatment may deviate due to changes in composition45
When the temperature exceeds 0°C, embrittlement becomes significant, and when the temperature is lower than 250°C, stress relaxation by annealing is impossible and has little effect. If the cooling rate in a magnetic field exceeds 300°C per hour, uneven cooling is likely to occur, and this is the case when the cooling rate exceeds 300°C per hour. is not obtained.

Hereinafter, it will be explained in detail based on examples.

111t1 Table C shows examples of DC magnetism of the amorphous alloy core constituting the wound core of the present invention with respect to conventional supermalloy and 5ONi permalloy. This is the case when the optimum heat treatment temperature is adopted for any composition.

Table 1 As is clear from Table 1, the amorphous alloy core constituting the wound core of the present invention exhibits a low coercive force that is equal to or lower than that of supermalloy, and the percentage is on the same level as that of 5ONi permalloy. It is clear that it has overall excellent performance, combining the advantages of conventional materials, and exhibits excellent excitation current characteristics. 'Figure 1 shows alloy A in Table 1!
(3), the excitation current characteristics in sOHm of the wound core configured as M + 6 (4) are shown in comparison with supermalloy (1) and 5ONi permalloy (2) (the numbers in parentheses are the numbers in the figure). ).

The core dimensions of the wound core are inner diameter 25971φ, outer diameter 55xmφ
, the height Sws, and the number of excitation turns are 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, has excellent linearity during this period, and has excellent excitation characteristics. have.

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 shields, magnetic amplifiers, magnetic phase shifters, DC current detectors, magnetic modulators, etc. It is. Further, due to 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 H$.

Claims (1)

[Claims] t A wound core formed by winding a high magnetic permeability alloy thin plate, characterized in that an F.-Co-S l-B based amorphous alloy thin plate is used as the alloy thin plate. Wound core. 2. In the item described in claim 1, the amorphous alloy has a composition formula F., CoeTf81. B, (in the formula,
TFi, Be, Mg, Ca, 8r, Ba, TI
, Zr, Hf. V, Nb, Ta, Cr, Mo, W, Mn, Ru, Ni,
Pd. Cu%Zn, Y, Co, Pr, Nd, Sm, Eu, Gd
,Tb. One or more types of Dy, d+・10f+g+
h= 100.72≦d10≦85, α70≦”/(a
+・)≦199.0≦f≦3.7×g (16.7×h×10.15≦g10h≦25). (5) Claims 1 and 9 are also set forth in paragraph 2, in which the amorphous alloy is annealed at a temperature between 250°C and 450°C in a direct current or alternating current magnetic field of 10 Oe or more. , a wound core obtained by cooling in a magnetic field at a cooling rate of 300°C or less per hour.