RU2041514C1 - Transformer - Google Patents

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Publication number
RU2041514C1
RU2041514C1 RU92010326A RU92010326A RU2041514C1 RU 2041514 C1 RU2041514 C1 RU 2041514C1 RU 92010326 A RU92010326 A RU 92010326A RU 92010326 A RU92010326 A RU 92010326A RU 2041514 C1 RU2041514 C1 RU 2041514C1
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RU
Russia
Prior art keywords
transformer
magnetic alloy
content
boron
core
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RU92010326A
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Russian (ru)
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RU92010326A (en
Inventor
Ю.Н. Стародубцев
В.И. Кейлин
В.Я. Белозеров
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Научно-производственное предприятие "Гамма"
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Priority to RU92010326A priority Critical patent/RU2041514C1/en
Publication of RU92010326A publication Critical patent/RU92010326A/en
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Abstract

FIELD: electrical engineering. SUBSTANCE: proposed transformer has one or more strip-wound cores made of iron base magnetic alloy and several windings inductively coupled with cores; magnetic alloy has components in following proportion; at. percent: copper 0.5-2.0; one or more components of group containing niobium, tantalum, tungsten, molybdenum, chromium, vanadium 2-5; silicon 5-18; boron 4-14; iron the rest. EFFECT: improved design of core. 11 cl, 7 tbl

Description

 The invention relates to metallurgy, in particular to iron-based magnetic alloys, from which the cores of current transformers, power transformers of secondary power sources and high-frequency transformers for various purposes are made.

 For current transformers operating in the field of weak magnetic fields, the most important indicator is the high inductance of the core, which is linearly related to the initial magnetic permeability. High inductance provides increased accuracy of the current transformer. In power transformers of secondary power sources, it is necessary to have cores with high magnetic permeability and low magnetic losses in the frequency range of about 10 kHz.

Known transformers, the cores of which are made of electrical steel and alloys of type 45 NP with an initial magnetic permeability of up to 4000 A / m [1]
A known transformer selected as a prototype, the core of which is made of an amorphous alloy based on iron with an initial magnetic permeability of 10,000 A / m. The composition of the alloy is determined by the region in the ternary diagram of iron-boron-silicon. The use of a thin amorphous tape (thickness 25 μm) of this composition allows us to achieve good characteristics of transformers in the high frequency region [2]
In order to improve the electromagnetic characteristics of transformers, a transformer is proposed in which the magnetic circuit is made of a magnetic alloy based on iron containing components in the following ratio, at. copper 0.5-2.0; one or more components from the group comprising niobium, tantalum, tungsten, molybdenum, chromium, vanadium, 2-5; silicon 5-18; boron 4-12; iron the rest. To obtain the highest electromagnetic characteristics of the transformer, the alloy must have a structure in which at least 50% of crystallites with a size of less than 100 nm.

 One embodiment of the invention is a transformer, in which the core is made of an alloy containing copper, niobium, molybdenum or chromium or tungsten, silicon, boron, an iron base. The presence of molybdenum, chromium, and tungsten in the alloy makes it possible to form an oxide film of these elements on the surface of the tape, which prevents internal oxidation and, therefore, allows the production of cores with high magnetic properties.

 To obtain the highest magnetic permeability, it is preferable that the silicon content is in the range of 12-15 at. and the boron content is 8 10 at.

 After applying the winding to the core, impregnating or performing other operations, compressive stresses may occur in the core that impair the magnetic properties. To obtain a core with low sensitivity to external mechanical stresses, it is preferable that the silicon content in the alloy is in the range of 14-17 at. and the content of boron is 6-8 at.

 For power transformers, it is preferable to use alloys with high saturation induction. For this, it is necessary that the silicon content is in the range of 7-11 at. and the content of boron is 9-11 at.

EXAMPLES In the table. 1 shows the results of testing cores 32 x 20 x 10 mm in size, made of a tape 25 ± 3 μm thick of a magnetic alloy Fe 72.5 Cu 1 Nb 2 M 2 Si 13.5 B 9 , where M Nb, Ta, W, Mo, Cr, V. Annealing of the cores was carried out in air according to the optimal regime for each alloy. From the table. 1, it follows that the highest permeability is obtained in the cores of an alloy in which Mo, Cr, W elements are present, which form an oxide film on the surface of the tape.

In the table. 2 shows the results of testing cores made of an alloy of Fe 75.5-6 Cu 1 (Mo x Nb 1-x ) b Si 13.5 B 9 . The mode of annealing of the cores 32 x 20 x 10 mm in air at 540 about 1 hour. From the table. 2 it follows that the ratio of molybdenum to the sum of the components of molybdenum and niobium 0.5 is optimal for obtaining the highest initial magnetic permeability μ o .

In the table. 3 shows a comparison of the magnetic properties of the cores made of Fe 73.5 Cu 1 Mo 1.5 Nb 1.5 Si 13.5 B 9 alloy and Fe 8 , Si 5 B 14 alloy used for the manufacture of the prototype transformer core.

In the table. Figures 4 and 5 show the results of testing cores made of an alloy Fe 96-yZ Cu 1 Mo 1.5 Nb 1.5 Si 13.5 B 9 after annealing according to the optimal regime. From the table. 4 it follows that to obtain cores with high saturation induction it is necessary to reduce the content of silicon and boron in the alloy. In the table. 5 shows the data after the annealing of the cores and then impregnating them with an aqueous solution of sodium water glass and drying at 100 ° C for 2 hours. The inorganic adhesive Drying creates compressive stresses in the core, which reduce the magnetic permeability and magnetic losses increase. From the table. 5, it follows that with an increase in the ratio of silicon to boron, the sensitivity of magnetic permeability to compressive stresses decreases. Moreover, a decrease in the sensitivity of the magnetic properties of the core to compressive stresses while maintaining a high level of these properties is achieved with a silicon content in the range of 14-17 at. and boron is 6-8 at.

In the table. Figure 6 shows a comparison of the current and angular (f, and δ, min, respectively) errors of the current transformer. Both transformers have the same parameters of the primary and secondary windings: W 1 4, I 1 300 A; W 2 240, I 2 5 A. Secondary load of 5 VA. The magnetic cores are made of an alloy of Fe 73.5 Cu 1 Mo 1.5 Nb 1.5 Si 13.5 B 9 and an amorphous alloy Fe 81 Si 5 B 14 and have dimensions 140 x x120 x 35 and 130 x 90 x 40 mm, respectively. From the table. 6 it follows that the use of a Fe 73.5 Cu 1 Mo 1.5 Nb 1.5 Si 13.5 B 9 alloy transformer in the transformer, despite a smaller core cross section, reduces the current and angular errors of the current transformer.

Let us compare the parameters of power transformers whose magnetic cores are made of an alloy Fe 73.5 Cu 1 Mo 1.5 Nb 1.5 Si 13.5 B 9 (1) and an alloy Fe 81 Si 5 B 14 (2). The following transformer characteristics are specified: operating frequency 20 kHz, voltage per revolution U / W10B, magnetic losses in the core no more than 12 W. These requirements are met by transformers with the parameters presented in table. 7. It follows that the transformer with the core of the alloy Fe 73.5 Cu 1 Mo 1.5 Nb 1.5 Si 13.5 B 9 has a mass of 2.5 times less than the prototype transformer.

Claims (9)

 1. A TRANSFORMER consisting of one or more tape cores made of a magnetic alloy containing silicon, boron and iron, and several windings inductively coupled to the cores, characterized in that the magnetic alloy further comprises copper and one or more components selected from groups of niobium, tantalum, tungsten, molybdenum, chromium, vanadium, with the following ratio of alloy components, at.
Copper 0.5 2.0
One or more components from the group containing
niobium, tantalum, tungsten, molybdenum, chromium, vanadium 2 5
Silicon 5 18
Boron 4 12
Iron Else
2. The transformer according to claim 1, characterized in that the core is made of an alloy with a structure consisting of at least 50% of crystals less than 100 nm in size.
3. The transformer according to claim 1, characterized in that the core is made of a magnetic alloy containing copper, molybdenum, niobium, silicon, boron, iron,
4. The transformer according to claim 3, characterized in that in the magnetic alloy the ratio of the molybdenum content to the sum of the content of molybdenum and niobium is 0.1 to 1.0.
 5. The transformer according to claim 3, characterized in that in the magnetic alloy the ratio of the molybdenum content to the sum of the content of molybdenum and niobium is 0.5.
 6. The transformer according to claim 3, characterized in that on the surface of the magnetic alloy tape there is a molybdenum oxide film with a thickness of at least 5 nm.
 7. The transformer according to claim 1, characterized in that the core is made of a magnetic alloy containing copper, niobium, chromium and / or tungsten, silicon, boron, iron.
 8. The transformer according to claim 7, characterized in that on the surface of the magnetic alloy tape there is a film of chromium oxide or tungsten with a thickness of at least 5 nm.
 9. The transformer according to claim 1, characterized in that the core is made of a magnetic alloy in which the silicon content is 4 to 17 at. and the content of boron is 6 8 at.
 10. The transformer according to claim 1, characterized in that the core is made of a magnetic alloy in which the silicon content is 12 15 at. and the content of boron is 3 at.
 11. The transformer according to claim 1, characterized in that the core is made of a magnetic alloy in which the silicon content is 7 11 at. and the boron content is 9 11 at%
RU92010326A 1992-12-07 1992-12-07 Transformer RU2041514C1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
RU92010326A RU2041514C1 (en) 1992-12-07 1992-12-07 Transformer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
RU92010326A RU2041514C1 (en) 1992-12-07 1992-12-07 Transformer

Publications (2)

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RU92010326A RU92010326A (en) 1995-04-20
RU2041514C1 true RU2041514C1 (en) 1995-08-09

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RU92010326A RU2041514C1 (en) 1992-12-07 1992-12-07 Transformer

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Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
1. Сидоров И.И. Мукосеев В.В. и Христинин А.Л. Малогабаритные трансформаторы и дроссели. М.: Радио и связь, 1985. *
2. Патент Великобритании N 2038358, кл. C 22C 38/02, 1980. *

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