CN117352273B - Iron core unit and magnetic powder core reactor - Google Patents
Iron core unit and magnetic powder core reactor Download PDFInfo
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- CN117352273B CN117352273B CN202311404659.9A CN202311404659A CN117352273B CN 117352273 B CN117352273 B CN 117352273B CN 202311404659 A CN202311404659 A CN 202311404659A CN 117352273 B CN117352273 B CN 117352273B
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- 239000006247 magnetic powder Substances 0.000 title claims abstract description 110
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims description 236
- 239000011162 core material Substances 0.000 claims abstract description 162
- 238000004804 winding Methods 0.000 claims abstract description 63
- 239000000696 magnetic material Substances 0.000 claims abstract description 23
- 229910052742 iron Inorganic materials 0.000 claims description 66
- 238000003475 lamination Methods 0.000 claims description 41
- 230000005291 magnetic effect Effects 0.000 claims description 33
- 229910000976 Electrical steel Inorganic materials 0.000 claims description 19
- 239000000463 material Substances 0.000 claims description 11
- 230000035699 permeability Effects 0.000 claims description 7
- 230000004907 flux Effects 0.000 claims description 5
- 229910005347 FeSi Inorganic materials 0.000 claims description 4
- PMVSDNDAUGGCCE-TYYBGVCCSA-L Ferrous fumarate Chemical group [Fe+2].[O-]C(=O)\C=C\C([O-])=O PMVSDNDAUGGCCE-TYYBGVCCSA-L 0.000 claims description 2
- 239000000853 adhesive Substances 0.000 claims description 2
- 230000001070 adhesive effect Effects 0.000 claims description 2
- 239000002707 nanocrystalline material Substances 0.000 claims description 2
- 230000007547 defect Effects 0.000 abstract description 3
- 230000000052 comparative effect Effects 0.000 description 17
- 239000003822 epoxy resin Substances 0.000 description 6
- 229920000647 polyepoxide Polymers 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000005389 magnetism Effects 0.000 description 4
- 230000005415 magnetization Effects 0.000 description 4
- 238000000137 annealing Methods 0.000 description 3
- 230000006698 induction Effects 0.000 description 3
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
Classifications
-
- 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
- H01F27/26—Fastening parts of the core together; Fastening or mounting the core on casing or support
- H01F27/263—Fastening parts of the core together
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F37/00—Fixed inductances not covered by group H01F17/00
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Soft Magnetic Materials (AREA)
Abstract
一种铁心单元及磁粉芯电抗器，属于电抗器技术领域，克服就现有技术中铁心难以同时具有低损耗和低噪音的缺陷。本发明铁心单元包括磁粉芯铁心和套设在磁粉芯铁心外部的卷绕铁心；卷绕铁心采用软磁材料，磁粉芯铁心采用磁粉芯材料，所述软磁材料损耗＜磁粉芯材料损耗；所述卷绕铁心由若干个环形卷绕铁心沿磁粉芯铁心高度方向排列而成，上下相邻的两个环形卷绕铁心之间设置有高度≤8mm的气隙。本发明铁心单元同时具有较低的损耗和较低噪音。
A core unit and a magnetic powder core reactor, belonging to the technical field of reactors, overcome the defect that the core in the prior art is difficult to have both low loss and low noise. The core unit of the present invention comprises a magnetic powder core and a winding core sleeved on the outside of the magnetic powder core; the winding core adopts a soft magnetic material, and the magnetic powder core adopts a magnetic powder core material, and the loss of the soft magnetic material is less than the loss of the magnetic powder core material; the winding core is composed of a plurality of annular winding cores arranged along the height direction of the magnetic powder core, and an air gap with a height of ≤8mm is provided between two adjacent annular winding cores. The core unit of the present invention has both low loss and low noise.
Description
Technical Field
The invention belongs to the technical field of reactors, and particularly relates to an iron core unit and a magnetic powder core reactor.
Background
The parallel reactor is widely applied in the reactive compensation field and is mainly used for absorbing the capacitive reactive power of the power transmission lines with different voltage levels. The magnetic circuit structure of the existing iron core shunt reactor is a combined structure of silicon steel and an air gap, and the noise problem of the existing iron core reactor is outstanding due to the existence of the air gap.
Compared with silicon steel materials, the magnetic powder core material has the characteristic of low magnetic permeability, and when the magnetic powder core material is applied to a magnetic circuit structure of a reactor, the magnetic powder core material can reduce or completely replace an air gap in a magnetic circuit, and is hopeful to thoroughly solve the problem of exceeding noise of the existing silicon steel core shunt reactor. However, the magnetic powder core material has larger loss, and the direct application of the magnetic powder core material as the iron core column can cause overlarge iron core loss.
Disclosure of Invention
Therefore, the invention aims to overcome the defect that the iron core is difficult to have low loss and low noise in the prior art, thereby providing an iron core unit and a magnetic powder core reactor.
For this purpose, the invention provides the following technical scheme.
In a first aspect, the present invention provides an iron core unit including a magnetic powder core and a wound iron core sleeved outside the magnetic powder core;
the winding iron core is made of soft magnetic materials, the magnetic powder core iron core is made of magnetic powder core materials, and the loss of the soft magnetic materials is less than the loss of the magnetic powder core materials;
The winding iron core is formed by arranging a plurality of annular winding iron cores along the height direction of the magnetic powder core, and an air gap with the height less than or equal to 8mm is arranged between two upper and lower adjacent annular winding iron cores.
Soft magnetic materials generally refer to magnetic materials having a low coercivity and a high permeability.
The magnetic powder core material is a composite soft magnetic material formed by mixing and pressing ferromagnetic powder and an insulating medium.
The loss of the soft magnetic material is less than that of the magnetic powder core material, and the loss refers to the loss at the frequency of 50Hz under the same magnetic flux density, and the loss unit is (W/kg).
Further, the inner diameter of the wound core is equal to the diameter of the magnetic powder core, and the outer diameter of the wound core is 1.04-1.30 times of the diameter of the magnetic powder core.
Further, the diameter of the magnetic powder core iron core is 50-400 mm.
Further, in the plurality of annular winding cores, the upper end face of the uppermost annular winding core is flush with the upper end face of the magnetic powder core, and the lower face of the lowermost annular winding core is flush with the lower end face of the magnetic powder core.
Further, the soft magnetic material is isotropic. The winding iron core of the iron core unit is wound along the length direction of the soft magnetic material, namely, along the direction easy to conduct magnetism during manufacturing. When the reactor of the invention operates, the magnetic field of the winding iron core part is along the vertical winding direction (easy magnetic conduction direction), namely, the magnetic field is along the difficult magnetic conduction direction, and the magnetic field direction performances of the two directions of the isotropic material are basically the same. If the material is an anisotropic material, the winding direction is easy to conduct magnetism, and the direction perpendicular to the winding direction is the direction difficult to conduct magnetism, so that the loss in the direction difficult to conduct magnetism is relatively large, and the loss is difficult to reduce.
Further, the soft magnetic material is at least one of non-oriented silicon steel, amorphous material or nanocrystalline material.
Further, the relative magnetic conductivity of the magnetic powder core material is less than or equal to 60.
Further, the magnetic powder core material is FeSi magnetic powder, feSiAl magnetic powder or nanocrystalline magnetic powder with the frequency of 50Hz and the magnetic flux density of 1.0T and the loss less than or equal to 5.0W/kg;
further, the soft magnetic material is non-oriented silicon steel with the trade mark of 35W 210.
Further, a first air passage is formed in the magnetic powder core iron core, and preferably, the magnetic powder core iron core is composed of two symmetrical arc-shaped magnetic powder cores, and a gap between the two arc-shaped magnetic powder cores forms the first air passage; preferably, the width of the first air passage is 5-15 mm.
Further, the height of the magnetic powder core is 20 mm-80 mm, and the section is round.
In a second aspect, the invention provides a magnetic powder core reactor, which comprises an upper iron yoke, a plurality of iron core columns, a plurality of windings and a lower iron yoke; the iron core columns are positioned between the upper iron yoke and the lower iron yoke, and each winding is correspondingly sleeved on one iron core column;
each core limb consists of a plurality of the core units.
Further, the upper and lower adjacent iron core units are bonded by the adhesive, and the bonding gap height is less than or equal to 0.10mm.
Further, the upper iron yoke is provided with a second air passage along the length direction, the lower iron yoke is provided with a third air passage along the length direction, and the first air passage, the second air passage and the third air passage are aligned in parallel to form a through air passage.
Further, the upper yoke comprises a first multi-stage yoke lamination and a second multi-stage yoke lamination which are symmetrical, and the first multi-stage yoke lamination is formed by stacking a plurality of yoke laminations with the same width and different lengths.
Further, the width of the iron yoke lamination is 50% -75% of the diameter of the iron core column.
The iron yoke lamination is made of oriented silicon steel, and the loss is not higher than 1.05W/kg under the sine magnetization condition of 50Hz frequency and 1.70T magnetic density; such as oriented silicon steel grade B30P 105.
Further, a plurality of iron core columns are arranged along the length direction of the upper iron yoke, and the distance between two adjacent iron core columns is equal.
The upper iron yoke and the lower iron yoke are vertically and symmetrically distributed.
The upper iron yoke and the lower iron yoke form a stepped semicircle corresponding to the diameter of the iron core column at the two ends by adopting iron yoke lamination sheets with different lengths and different thicknesses to be stacked along the radial direction.
Further, the widths of the first air passage, the second air passage and the third air passage are the same.
The winding is formed by pouring epoxy resin: the coils in the winding are wound in multiple layers, epoxy resin is integrally poured after winding is completed, and the epoxy resin is solidified to form the poured coil.
The technical scheme of the invention has the following advantages:
1. The iron core unit comprises a magnetic powder core and a winding iron core arranged outside the magnetic powder core; the winding iron core is made of soft magnetic materials, the magnetic powder core iron core is made of magnetic powder core materials, and the loss of the soft magnetic materials is less than the loss of the magnetic powder core materials; the winding iron core is formed by arranging a plurality of annular winding iron cores along the height direction of the magnetic powder core, and an air gap with the height less than or equal to 8mm is arranged between two upper and lower adjacent annular winding iron cores.
According to the invention, the iron core unit is designed into a magnetic circuit structure that the magnetic powder core material and the low-loss soft magnetic material are connected in parallel inside and outside, when a magnetic field flows through the iron core unit, the magnetic field can be split, namely, one part of the magnetic field passes through the inner magnetic powder core material, and the other part of the magnetic field passes through the outer soft magnetic material, so that the loss of the magnetic powder core material is reduced, the overhigh temperature of the magnetic powder core is avoided, and the integral loss of the iron core unit is reduced.
The magnetic powder core iron core inside the iron core unit has no air gap, and only the winding iron core arranged outside is provided with the air gap with the height less than or equal to 8mm, so that the noise of the iron core unit is obviously reduced.
The iron core unit has lower loss and lower noise.
2. The inner diameter of a wound iron core of the iron core unit is equal to the diameter of a magnetic powder core iron core, and the outer diameter of the wound iron core is 1.04-1.30 times of the diameter of the magnetic powder core iron core. The noise can be ensured not to be increased obviously like the traditional silicon steel iron core reactor, and the purpose of reducing the loss of the magnetic powder core can be achieved. Avoiding noise or excessive loss.
3. The magnetic powder core iron core of the iron core unit is internally provided with a first air passage. The first air passage can increase heat dissipation of the magnetic powder core iron core, and the application is prevented from being influenced due to overhigh temperature.
4. The upper iron yoke of the reactor is provided with a second air passage along the length direction, the lower iron yoke is provided with a third air passage along the length direction, and the first air passage, the second air passage and the third air passage are aligned in parallel to form a through air passage. The loss of the reactor can be reduced, the heat dissipation is enhanced, the overall temperature of the reactor is reduced, and the applicability is improved.
5. In the iron core unit, the relative magnetic permeability of the magnetic powder core material is less than or equal to 60. The relative magnetic permeability of the magnetic powder core material is limited in the range of the invention, so that the situation that the noise is increased because an air gap is required to be introduced to meet the inductance value of the reactor when the magnetic permeability is overlarge can be avoided.
6. The width of the iron yoke lamination is 50% -75% of the diameter of the iron core column. The width of the iron yoke lamination is smaller than the diameter of the iron core column, so that the weight of the upper iron yoke and the lower iron yoke can be reduced, and the characteristic of high magnetic induction of the iron yoke silicon steel material is fully utilized. The method comprises the following steps: the height of the iron yoke of the traditional pure silicon steel iron core reactor is larger than the diameter of the iron core column, and the purpose of the iron yoke is to prevent the iron yoke from saturation and increase loss. The iron yoke is made of silicon steel, the magnetic induction of the iron yoke is higher than that of magnetic powder materials, the height of the iron yoke can be reduced in order to fully utilize the characteristic of high magnetic induction of the iron yoke, the magnetic density in the iron yoke is improved to some extent, and the performance can be guaranteed while the weight and cost of the iron yoke can be reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a magnetic powder core reactor according to embodiment 1;
fig. 2 is a schematic diagram of a core leg structure;
Fig. 3 is a structural view of a core unit;
Fig. 4 is a view showing a structure of a magnetic powder core;
Fig. 5 is a structural view of a wound core;
FIG. 6 is a block diagram of the upper and lower yokes;
Fig. 7 is a top view structural dimension of the magnetic powder core reactor, and the dimension (length unit: mm) of each lamination can be seen from the figure;
fig. 8 is a schematic diagram of the shunt reactor of comparative example 1 (winding omitted in the drawing);
fig. 9 is a schematic diagram of the shunt reactor of comparative example 2 (the windings are omitted).
Reference numerals:
1-an upper iron yoke; 2-an iron core column; 3-winding; 4-a lower yoke; a 5-core unit; 6-a magnetic powder core; 701-a first annular wound core; 702-a second annular wound core; 8-air gap; 9-winding the iron core; 10-a first multi-stage yoke lamination; 11-a second multi-stage yoke lamination; 12-a second airway; 13-a first arc-shaped magnetic powder core; 14-a second arc-shaped magnetic powder core; 15-first airway.
Detailed Description
The following examples are provided for a better understanding of the present invention and are not limited to the preferred embodiments described herein, but are not intended to limit the scope of the invention, any product which is the same or similar to the present invention, whether in light of the present teachings or in combination with other prior art features, falls within the scope of the present invention.
The specific experimental procedures or conditions are not noted in the examples and may be followed by the operations or conditions of conventional experimental procedures described in the literature in this field. The reagents or apparatus used were conventional reagent products commercially available without the manufacturer's knowledge.
Example 1
The utility model provides a 10kV, 300 kvar's magnetic powder core shunt reactor structure, is shown as fig. 1, includes upper yoke 1, three iron leg 2 that are located the top, three winding 3 that suit respectively on iron leg 2 and is located the lower yoke 4 of bottom. The three iron core columns 2 are positioned between the upper iron yoke 1 and the lower iron yoke 4, are respectively positioned at the two ends and the middle of the upper iron yoke 1 along the length direction of the upper iron yoke 1, and have equal spacing between two adjacent iron core columns 2 and 400mm center distance.
As shown in fig. 2, the core leg 2 is formed by bonding 12 core units 5 in the axial direction, the height of the core units 5 is 80mm, the bonding gap is 0.10mm, the height of the core leg 2 is 961.1mm, and the diameter is 185mm.
The core unit 5 is composed of a magnetic powder core 6 and a wound core 9 disposed outside the magnetic powder core 6, as shown in fig. 3 to 5. The winding iron core 9 is made of soft magnetic materials, the magnetic powder core iron core 6 is made of magnetic powder core materials, the loss of the soft magnetic materials is less than that of the magnetic powder core materials, and the soft magnetic materials are isotropic. The wound core 9 in this example is formed by winding and annealing (vacuum annealing in a vacuum annealing furnace at 750 ℃ for 3 hours to remove stress induced by winding) non-oriented silicon steel with a mark of 35W 210. The magnetic powder core 6 is made of FeSi magnetic powder core material with relative magnetic conductivity of 60 and loss of 5.0W/kg when the magnetic flux density is 1.0T at the power frequency of 50 Hz. The loss of the non-oriented silicon steel of 35W210 is lower than that of the magnetic powder core material.
As shown in fig. 5, the wound core 9 is formed by arranging 2 annular wound cores having a height of 37.5mm in the height direction along the magnetic powder core 6 having a height of 80mm, and the upper end portion of the first annular wound core 701 positioned at the upper portion is flush with the upper end portion of the magnetic powder core 6, and the lower end portion of the second annular wound core 702 positioned at the lower portion is flush with the lower end portion of the magnetic powder core 6.
An air gap 8 having a height of 5mm is provided between first annular wound core 701 and second annular wound core 702. The inner diameters of first annular wound core 701 and second annular wound core 702 are 145mm, which are the same as the diameter of magnetic powder core 6, and the outer diameters of first annular wound core 701 and second annular wound core 702 are 185mm, which are the same as the diameter of core limb 2.
As shown in fig. 4, the magnetic powder core iron core 6 is composed of a first circular arc-shaped magnetic powder core 13, a second circular arc-shaped magnetic powder core 14 and a first air passage 15 positioned between the first circular arc-shaped magnetic powder core 13 and the second circular arc-shaped magnetic powder core 14, wherein the width of the first air passage 15 is 10mm.
As shown in fig. 6 and 7, the upper yoke 1 is provided with a second air passage 12 along the length direction, the lower yoke 4 is provided with a third air passage along the length direction, and the first air passage 15, the second air passage 12 and the third air passage of the upper and lower adjacent core units 5 are aligned in parallel to form a through air passage. The first air passage 15, the second air passage 12 and the third air passage have the same width.
The upper yoke 1 comprises symmetrical first and second multi-stage yoke laminations 10, 11, the first and second multi-stage yoke laminations 10, 11 being formed by stacking yoke laminations of the same width (direction perpendicular to the plane of the paper in fig. 7) and of different lengths and thicknesses. The width of the yoke laminations in this embodiment is 75% of the diameter of the leg cores and is about 143mm.
The first multi-stage iron yoke lamination 10 in this embodiment is formed by stacking 7 iron yoke laminations having lengths x thicknesses (mm x mm) of 20.50 x 984.86, 13 x 974.86, 14 x 959.86, 13 x 939.86, 11 x 914.86,8 x 889.86,8 x 849.86, respectively. The first multi-stage yoke lamination 10 and the second multi-stage yoke lamination 11 are formed at both ends thereof in a stepped semicircular shape corresponding to the diameter of the core leg 2.
In the embodiment, the iron yoke lamination adopts oriented silicon steel with the trade name of B30P105, and the loss is 1.03W/kg under the sine magnetization condition of 50Hz frequency and 1.70T magnetic density.
The winding 3 is formed by pouring a bi-component epoxy resin material for a conventional dry-type transformer in a star-shaped connection mode. The number of turns of the winding is 981, the winding is wound in 9 layers, the inner diameter of the winding is 260mm, the outer diameter of the winding is 360mm, and the winding 3 is sleeved on the iron core limb 2, as shown in figure 2.
The 10kV rated voltage is applied to the 10kV and 300kvar magnetic powder core shunt reactor, the reactance value is 334 omega, the core loss is 1900W, and the noise is 50dB. The loss of the magnetic powder core 6 was 1178W, and the loss of the wound core 9 was 722W.
Comparative example 1
The comparative example provides a shunt iron core reactor, as shown in fig. 8, comprising an upper iron yoke 1 at the top, three iron legs 2, three windings respectively sleeved on the iron legs 2, and a lower iron yoke 4 at the bottom. The three iron core columns 2 are positioned between the upper iron yoke 1 and the lower iron yoke 4, are respectively positioned at the two ends and the middle of the upper iron yoke 1 along the length direction of the upper iron yoke 1, and have equal spacing between two adjacent iron core columns 2 and a center distance of 349mm.
The iron core column 2 is formed by arranging 4 iron core units with different heights along the axial direction, the heights of the 4 iron core units 5 are 214mm, 150mm and 214mm from bottom to top respectively, the height of an air gap between the upper iron core unit and the lower iron core unit is 8mm, the total height of the air gap of the iron core column is 24mm, the height of the iron core column 2 is 752mm, and the diameter of the iron core column is 175mm. The air gap in the comparative example was supported by providing 4 epoxy spacers of 8mm thickness between the upper and lower core units.
The iron core unit 5 is made of conventional pure silicon steel, in particular 35W550 grade non-oriented silicon steel. The performance index of the iron core reactor of the comparative example 1 meets the JB/T10775 standard requirement.
The upper yoke 1 is composed of two symmetrical multi-stage yoke laminations which are stacked by yoke laminations of the same width (the direction parallel to the length of the paper in fig. 8) and different lengths and thicknesses.
The multi-stage yoke lamination in this comparative example was a 7-stage lamination stack with a yoke lamination width of 193mm.
The first multi-stage yoke lamination 10 in this comparative example is formed by stacking 7 yoke laminations having lengths×thicknesses (mm×mm) of 873×24, 863×14, 848×13, 828×12, 803×11, 778×7, 748×6, respectively. The two ends of the upper iron yoke 1 are formed into a stepped semicircle with the diameter equivalent to that of the iron core limb.
The iron yoke lamination in this comparative example used 35W550 grade non-oriented silicon steel with a loss of 5.2W/kg under sinusoidal magnetization at a frequency of 50Hz and a magnetic density of 1.50T.
The winding is formed by pouring a bi-component epoxy resin material for a conventional dry-type transformer, and a star-shaped connection mode is adopted. The number of turns of the winding is 760, 6 layers of windings are wound, the inner diameter of the winding is 265mm, the outer diameter of the winding is 309mm, and the winding is sleeved on the iron core column 2.
Comparative example 2
The comparative example provides a shunt iron core reactor, as shown in fig. 9, comprising an upper iron yoke 1 at the top, three iron legs 2, three windings respectively sleeved on the iron legs 2, and a lower iron yoke 4 at the bottom. The three iron core columns 2 are positioned between the upper iron yoke 1 and the lower iron yoke 4, are respectively positioned at the two ends and the middle of the upper iron yoke 1 along the length direction of the upper iron yoke 1, and have equal spacing between two adjacent iron core columns 2 and 420mm center distance.
The iron core column 2 is formed by bonding 45 iron core units along the axial direction, the height of the iron core unit 5 is 20mm, the bonding gap height between the upper iron core unit and the lower iron core unit is 0.10mm, the height of the iron core column 2 is 904.5mm, and the diameter is 195mm.
The core unit 5 is made of the same magnetic powder core material as in the example, specifically a FeSi magnetic powder core material having a relative permeability of 60 and a loss of 5.0W/kg at a magnetic flux density of 1.0T at a power frequency of 50 Hz.
The upper yoke 1 is composed of two symmetrical multi-stage yoke laminations which are stacked by yoke laminations of the same width (the direction parallel to the length of the paper in fig. 9) and different lengths and thicknesses.
The multi-stage iron yoke lamination in this comparative example is an 8-stage lamination structure, and is formed by stacking 8 iron yoke laminations, and the width of each iron yoke lamination is 143mm. The length x thickness (mm x mm) of the yoke laminations are 1035 x 38, 1025 x 30, 1015 x 30, 1000 x 22, 980 x 22, 960 x 14, 935 x 14, 900 x 12, respectively. The two ends of the upper yoke 1 are formed into a stepped semicircle corresponding to the diameter of the core limb 2.
The iron yoke lamination in this comparative example used oriented silicon steel with a trade name of B30P105, which had a loss of 1.03W/kg under sinusoidal magnetization at a frequency of 50Hz and a magnetic density of 1.70T.
The winding 3 is formed by casting a conventional dry-type transformer by using a bi-component epoxy resin material in a star-shaped connection mode. The number of turns of the winding is 936, 13 layers of windings are wound, the inner diameter of the winding is 280mm, the outer diameter of the winding is 360mm, and the winding is sleeved on the iron core column 2.
The performance index of the parallel iron core reactor meets the JB/T10775 standard requirement.
Test examples
Table 1 shows the results of the reactor performance parameter tests of example 1, comparative example 1 and comparative example 2. The noise reduction of the example was about 12% compared to comparative example 1. The noise level was comparable to that of comparative example 2, and the core loss was reduced by 26%. The defect that the existing reactor is difficult to have low loss and low noise at the same time is overcome.
Table 1 shunt reactor test results
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present invention.
Claims (9)
1. The iron core unit is characterized by comprising a magnetic powder core iron core and a winding iron core sleeved outside the magnetic powder core iron core;
the winding iron core is made of soft magnetic materials, the magnetic powder core iron core is made of magnetic powder core materials, and the loss of the soft magnetic materials is less than the loss of the magnetic powder core materials;
the winding iron core is formed by arranging a plurality of annular winding iron cores along the height direction of the magnetic powder core, and an air gap with the height less than or equal to 8mm is arranged between two upper and lower adjacent annular winding iron cores;
the magnetic powder core iron core is composed of two symmetrical arc-shaped magnetic powder cores, and a gap between the two arc-shaped magnetic powder cores forms a first air passage.
2. The core unit according to claim 1, wherein an inner diameter of the wound core is equal to a diameter of the magnetic powder core, and an outer diameter of the wound core is 1.04 to 1.30 times the diameter of the magnetic powder core.
3. The core unit according to claim 1, wherein at least one of the following conditions is satisfied:
(1) The soft magnetic material is isotropic;
(2) The soft magnetic material is at least one of non-oriented silicon steel, amorphous material or nanocrystalline material;
(3) The relative magnetic permeability of the magnetic powder core material is less than or equal to 60;
(4) The magnetic powder core material is FeSi magnetic powder, feSiAl magnetic powder or nanocrystalline magnetic powder with the frequency of 50Hz and the loss less than or equal to 5.0W/kg under the magnetic flux density of 1.0T.
4. A core unit according to any one of claims 1-3, characterized in that the magnetic powder core has a core height of 20 mm-80 mm.
5. The magnetic powder core reactor is characterized by comprising an upper iron yoke, a plurality of iron core columns, a plurality of windings and a lower iron yoke; the iron core columns are positioned between the upper iron yoke and the lower iron yoke, and each winding is correspondingly sleeved on one iron core column;
each core limb consists of a number of core units according to any of claims 1-4.
6. A magnetic powder core reactor according to claim 5, wherein the upper and lower adjacent core units are bonded by an adhesive, and the bonding gap height is equal to or less than 0.10mm.
7. A magnetic powder core reactor according to claim 5 or 6, wherein the upper yoke is provided with a second air passage in a length direction, and the lower yoke is provided with a third air passage in a length direction; the second air passage and the third air passage are aligned in parallel with the first air passage arranged in the magnetic powder core, so that a through air passage is formed.
8. A magnetic powder core reactor according to claim 5 or 6, wherein the upper yoke comprises symmetrical first and second multi-stage yoke laminations, the first multi-stage yoke lamination being formed by stacking a plurality of yoke laminations having the same width and different lengths.
9. A magnetic powder core reactor according to claim 8, wherein the yoke laminations have a width of 50-75% of the diameter of the core limb.
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| WO2022131131A1 (en) * | 2020-12-18 | 2022-06-23 | 株式会社Ifg | Induction heating type heat treatment device for wound core and heat treatment method therefor |
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| JP2009038107A (en) * | 2007-07-31 | 2009-02-19 | Diamond Electric Mfg Co Ltd | Ignition coil for internal combustion engine |
| CN202473528U (en) * | 2011-08-26 | 2012-10-03 | 新华都特种电气股份有限公司 | Three-dimensional wound iron core electric reactor |
| CN102709031A (en) * | 2012-02-03 | 2012-10-03 | 苏州天擎电子通讯有限公司 | Novel electric reactor |
| CN104715899A (en) * | 2013-12-12 | 2015-06-17 | 台达电子企业管理（上海）有限公司 | Three-phase electric reactor |
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| WO2022131131A1 (en) * | 2020-12-18 | 2022-06-23 | 株式会社Ifg | Induction heating type heat treatment device for wound core and heat treatment method therefor |
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