CN114420431A - Conversion method of single-phase transformers with different structural iron core types - Google Patents
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- CN114420431A CN114420431A CN202210110836.1A CN202210110836A CN114420431A CN 114420431 A CN114420431 A CN 114420431A CN 202210110836 A CN202210110836 A CN 202210110836A CN 114420431 A CN114420431 A CN 114420431A
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 13
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 7
- 230000006698 induction Effects 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 description 5
- 239000010949 copper Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 239000004020 conductor Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
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- G—PHYSICS
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
- G06F17/15—Correlation function computation including computation of convolution operations
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/24—Magnetic cores
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Abstract
The invention provides a conversion method of single-phase transformers with different structural iron core modelsOriginal source(ii) a According to power POriginal sourceCalculating to obtain an iron core structural constant Sc atom*S0 atom(ii) a The power of the converted single-phase transformer is PChangeable pipeStructural constant S of the core of the single-phase transformer after conversionc change*S0 change(ii) a Another PChangeable pipe＝POriginal source；Sc change*S0 changeEqual to or about equal to Sc atom*S0 atom. The single-phase transformers with different shapes and the same power are obtained through the same iron core structure constant, so that the same power transformers with different lengths, widths and heights are generated; the problem that the space reserved for the transformer by the whole machine can be solved; solves the interchangeability of the iron cores with the same power and non-standardizationAnd (5) problems are solved.
Description
Technical Field
The invention relates to a conversion method of single-phase transformers with different structural iron core models.
Background
As is well known, it is a trend to reserve a narrow space for a chassis for installing a transformer under the trend of thinning and miniaturization of the power supply overall machine. Moreover, not only the enclosure space is narrow, but also transformers are required to be either flattened, or elongated, or square, or rectangular, and various shapes are not sufficient. The unidirectional transformer with the set model cannot meet the size requirement. Or along with the upgrading and updating of products, the overall shape of the products is changed, the occupied space of the single-phase transformer is compressed, and the single-phase transformer is replaced by the transformers with other structural iron core types.
Disclosure of Invention
The invention provides a conversion method of single-phase transformers with different structural iron core models; single-phase transformers with different shapes and same power are obtained through the same iron core structural constant, so that the same power transformers with different lengths, widths and heights are generated; the problem that the space reserved for the transformer by the whole machine can be solved; the interchangeability problem of the non-standardized iron cores with the same power is solved; overcomes the defects in the prior art.
The invention provides a conversion method of single-phase transformers with different structural iron core models, wherein the power P is 4.44fBm xj kc xSc xS0×10-8；
Wherein: bm-transformer core magnetic induction amplitude;
j-the current density of the copper-clad wire;
f-supply frequency;
S0-a window area of the core;
sc-cross sectional area of the core;
kc-the fill factor of the core;
km-the copper wire duty factor in the core window;
single-phase transformer P ═ P to be convertedOriginal source；
According to power POriginal sourceCalculating to obtain an iron core structural constant Sc atom*S0 atom；
The power of the converted single-phase transformer is PChangeable pipeStructural constant S of the core of the single-phase transformer after conversionc change*S0 change；
Another PChangeable pipe＝POriginal source；Sc change*S0 changeEqual to or about equal to Sc atom*S0 atom。
Further, the invention provides a conversion method of single-phase transformers of different models, which can also have the following characteristics: the single-phase transformer is EI-type iron core or UI-type iron core or CD-type iron core.
Furthermore, the invention provides a single-phase transformer with different structural iron core typesThe conversion method may also have the following features: s0＝h×c；Sc＝a×b；
Wherein h-the height of the window of the core;
c-width of the window of the core;
a-the width of the core;
b-thickness of the core.
Then S0×Sc＝h×c×a×b。
Further, the invention provides a method for converting single-phase transformers with different structural iron core types, which can also have the following characteristics: h isOriginal source×cOriginal source×aOriginal source×bOriginal source＝hChangeable pipe×cChangeable pipe×aChangeable pipeAnd b is changed.
Further, the invention provides a method for converting single-phase transformers with different structural iron core types, which can also have the following characteristics: pChangeable pipe＝POriginal source＝0.75kVA；Sc change*S0 change≈Sc atom*S0 atom＝620。
Drawings
FIG. 1 is a profile view of a CD type 0.75kVA single-phase transformer in the embodiment.
Fig. 2 is a structure diagram of an iron core of a CD type 0.75kVA single-phase transformer in the embodiment.
FIG. 3 is a diagram of the appearance of a UI type 0.75kVA single-phase transformer in the embodiment.
FIG. 4 is a structure diagram of the core of the UI type 0.75kVA single-phase transformer in the embodiment.
Fig. 5 is an outline diagram of an EI type 0.75kVA single-phase transformer in the embodiment.
Fig. 6 is a structure diagram of an iron core of an EI type 0.75kVA single-phase transformer in the embodiment.
Detailed Description
In order to more clearly explain the implementation of the present invention, the following detailed description is made with reference to the accompanying drawings and examples. The specific examples described herein are merely illustrative of the present disclosure and are not intended to limit the present embodiments.
Examples
In the embodiment, a method for converting single-phase transformers with different structural iron core models is a design method for deriving correlation between single-phase transformer power and iron core structure constant from a transformer mathematical model, and establishes an accurate magnitude relationship as follows:
the basic formula of the power of the iron core is determined by the volt-ampere value of the transformer:
power P4.44 fBm kc Sc S0×10-8；
Wherein: bm-transformer core magnetic induction magnitude (Gs);
j-wire-wrapped copper conductor current density (A/mm x mm);
f-supply frequency (Hz);
S0window area of the iron core (cm x cm);
sc-cross sectional area (cm. times.cm) of the core;
kc-the fill factor of the core (0.91-0.96);
km-space factor of copper lines in the core window (0.18-0.39).
Of course, S0＝h×c Sc＝a×b S0×Sc＝h×c×a×b。
Wherein h-the height of the window of the core;
c-width of the window of the core;
c-width of the core;
d-thickness of the core.
All electrical property parameters and coefficients are set to a constant K, i.e.
K＝4.44fBm*j*kc*km×10-8。
Then, knowing the value of power P, the core structure constant Sc S can be obtained0＝P/K(cm4)。
As long as the core structure constant ScS0 is the same, the power P is the same, i.e. the proportional relationship between the core center post cross-sectional area Sc and the window cross-section S0 is changed anyway, and as long as the constant ScS0 is not changed, the corresponding power is also not changed.
Therefore, according to the current single-phase transformer power P to be convertedOriginal sourceCalculating to obtain an iron core structural constant Sc atom*S0 atom(ii) a Parameters of the alternative or switched unidirectional transformer namelyComprises the following steps: pChangeable pipe＝POriginal source；Sc change*S0 changeEqual to or about equal to Sc atom*S0 atom。
Three standard configurations of the structure of a single-phase transformer core: (1) the EI-type iron core consists of an E piece and an I piece, and is provided with a coil. (2) The UI type iron core consists of a U sheet and an I sheet, and 2 coils are arranged on the UI type iron core. (3) CD type iron core: consists of half U-shaped iron core and half U-shaped iron core, and is also provided with 2 coils. After the three iron cores are provided with the coils, the three iron cores are fixed into a transformer by using a clamping frame screw, and the lead wires are welded or fixed on the terminals by using screws.
The following description will be made by taking the core structures of three types of single-phase transformers as examples:
assuming a unidirectional transformer P to be convertedOriginal source0.75kVA, calculated according to the formula:
Sc atom*S0 atom＝620(cm4)；
Wherein h isOriginal source＝12.4，cOriginal source＝×4，aOriginal source＝2.5，bOriginal source＝5。
Then the alternative single-phase transformer PChangeable pipeMust also be 0.75kVA, Sc change*S0 changeEqual to or about equal to 620(cm 4).
Therefore, if the alternative model is UI type transformer, the parameter is PChangeable pipe＝0.75kVA，Sc change*S0 change≈620。hRing (C)＝12.5，cRing (C)＝×3，aRing (C)＝3，bRing (C)5.52; final Sc changeS0 is 621(cm 4).
If the replaced type is UI type transformer, the parameter is PChangeable pipe＝0.75kVA，Sc change*S0 change≈620。hRing (C)＝7.5，cRing (C)＝×2.5，aRing (C)＝5，bRing (C)6.62; final Sc change*S0 change＝620.6(cm4)。
The three single-phase transformers with different structural iron core types have the same power and the same structural constants of the iron cores, and can be mutually converted for use.
Certainly, after the structural constant of the iron core corresponding to a certain power is determined, the magnetic induction amplitude (Gs) of the iron core of the transformer still needs to be determined according to Bm; j-wire-wrapped copper conductor current density (A/mm x mm); f-supply frequency (Hz); kc-the fill factor of the core; (0.91-0.96); km-electrical and mechanical parameters such as the space factor of copper wires in the core window (0.18-0.39) adjust the ratio of Sc (main cross-sectional area of the core center post) and S0 (cross-sectional area of the core window) in the structural constant.
After the iron core is determined by the structural constant, a proper framework winding coil is designed to be suitable for assembling the iron core. If the matching is poor, the trim Bm-transformer core magnetic induction amplitude (Gs) and the trim j-coil copper conductor current density (A/mm multiplied by mm) are adjusted, namely, the coil number and the coil diameter are adjusted to make the coil completely fit for the assembly of the core.
The invention provides a conversion method of single-phase transformers with different structural iron core types, which reflects the interchangeability among iron cores with different structures to generate the same power transformer with different length, width and height, and realizes the interchangeability of iron cores with the same power and different heights by enabling the iron cores with three different structures of EI type UI type and CD type to have the same intermediate parameter of the structure constant of the iron core.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention.
Claims (5)
1. A conversion method of single-phase transformers with different structural iron core models is characterized in that:
power P4.44 fBm kc Sc S0×10-8；
Wherein: bm-transformer core magnetic induction amplitude;
j-the current density of the copper-clad wire;
f-supply frequency;
S0-a window area of the core;
sc-cross sectional area of the core;
kc-the fill factor of the core;
km-the copper wire duty factor in the core window;
sheets to be convertedPhase transformer P ═ POriginal source；
According to power POriginal sourceCalculating to obtain an iron core structural constant Sc atom*S0 atom；
The power of the converted single-phase transformer is PChangeable pipeStructural constant S of the core of the single-phase transformer after conversionc change*S0 change；
Another PChangeable pipe＝POriginal source；Sc change*S0 changeEqual to or about equal to Sc atom*S0 atom。
2. The method for converting a single-phase transformer having core types of different configurations according to claim 1, wherein:
the single-phase transformer is an EI-type iron core, a UI-type iron core or a CD-type iron core.
3. The method for converting a single-phase transformer having core types of different configurations according to claim 1, wherein: s0＝h×c；Sc＝a×b；
Wherein h-the height of the window of the core;
c-width of the window of the core;
a-the width of the core;
b-thickness of the core.
Then S0×Sc＝h×c×a×b。
4. A method for converting a single-phase transformer having core types of different configurations as set forth in claim 3, wherein:
horiginal source×cOriginal source×aOriginal source×bOriginal source＝hChangeable pipe×cChangeable pipe×aChangeable pipe×bChangeable pipe。
5. The method for converting a single-phase transformer having core types of different configurations according to claim 1, wherein:
wherein, PChangeable pipe＝POriginal source＝0.75kVA；Sc change*S0 change≈Sc atom*S0 atom＝620。
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101295931A (en) * | 2008-05-30 | 2008-10-29 | 深圳市科陆电子科技股份有限公司 | AC power source current output stabilization and converting circuit, converter and conversion method |
| CN106847477A (en) * | 2017-04-06 | 2017-06-13 | 青州市宝利电子有限公司 | A kind of ring-like power transformer substitutes the method and annular power transformer of EI type lamination silicon steel core transformers |
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- 2022-01-29 CN CN202210110836.1A patent/CN114420431A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101295931A (en) * | 2008-05-30 | 2008-10-29 | 深圳市科陆电子科技股份有限公司 | AC power source current output stabilization and converting circuit, converter and conversion method |
| CN106847477A (en) * | 2017-04-06 | 2017-06-13 | 青州市宝利电子有限公司 | A kind of ring-like power transformer substitutes the method and annular power transformer of EI type lamination silicon steel core transformers |
Non-Patent Citations (1)
| Title |
|---|
| 郭木森: "《电工学》", vol. 2, 高等教育出版社, pages: 517 - 525 * |
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