CN213400813U - Rectangular nanocrystalline iron core - Google Patents
Rectangular nanocrystalline iron core Download PDFInfo
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- CN213400813U CN213400813U CN202022759975.6U CN202022759975U CN213400813U CN 213400813 U CN213400813 U CN 213400813U CN 202022759975 U CN202022759975 U CN 202022759975U CN 213400813 U CN213400813 U CN 213400813U
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Abstract
The utility model discloses a rectangular nanocrystalline iron core, which is a hollow cuboid formed by winding nanocrystalline strips, and an adhesion layer is arranged between adjacent nanocrystalline strip layers and is obtained by a dip coating solidification mode; the four outer side surfaces of the hollow cuboid are connected with each other through an outer arc surface; every two of the four inner side surfaces of the hollow cuboid are connected through an inner arc surface; the periphery of the cross section of the rectangular nanocrystalline iron core is rectangular, and four edges of the rectangle are connected in pairs through arcs; the length of the rectangle is 300-800mm, and the width of the rectangle is 200-700 mm; the rectangular nanocrystalline iron cores can be formed by stacking a plurality of rectangular nanocrystalline iron cores in the height direction, and bonding layers are arranged between adjacent rectangular nanocrystalline iron cores in the plurality of rectangular nanocrystalline iron cores. The utility model discloses a rectangle iron core size that coiling preparation was obtained is big, capacious.
Description
Technical Field
The utility model belongs to the technical field of the new material, in particular to rectangle nanocrystalline iron core.
Background
A high-capacity high-frequency transformer (the frequency is more than or equal to 10kHz, the capacity is more than or equal to 200kVA) is one of key core devices in the fields of flexible alternating current transmission, new energy (photovoltaic, wind power and the like) grid connection, power grid intellectualization, power grid side energy storage and the like.
The nanocrystalline iron core is the key for improving the capacity, the working frequency and the efficiency of the high-frequency transformer, reducing the volume and reducing the number of PET modules, and is the heart of the high-frequency transformer. However, the development and application of the large-capacity nanocrystalline iron core are restricted by common technical bottlenecks in the industries such as uneven microstructure, embrittlement during annealing, low yield, stress sensitivity and the like in the development process of the large-capacity nanocrystalline iron core.
Chinese patent applications CN1144389A and CN2266780Y disclose a nanocrystalline soft magnetic iron core with a protective box and a manufacturing method thereof, wherein an iron core element is composed of an iron core, a protective film on the end face of the iron core, and a protective box with ventilation holes. Chinese patent application 201510319907.9 discloses a rectangular amorphous nanocrystalline magnetic core and a method for making the same, comprising preparing a strip containing Co component, winding the strip, rectangular molding, annealing, and spraying the end face and surface of an iron core.
Chinese patent 201010223202.4 discloses a nanocrystalline strip material wound into an iron core with a diameter of 70mm x 120mm x 30mm, which is prepared by tape making, winding into an iron core, annealing in a magnetic field, and carrying out non-adhesion treatment on the iron core between sheets. Chinese patent application 201310071294.2 discloses a nanocrystalline iron core of power transformer of inverter welding machine and its preparation method, which comprises the steps of rapid hardening method for making belt, winding iron core and heat treatment, the maximum size of the iron core is phi 120mm phi 60mm phi 30mm nanocrystalline iron core, iron loss is 15W/kg under 20kHz and 0.5T, and remanence is 0.15T. Chinese patent 201480008901.3 discloses an annular magnetic core of an Fe-based nanocrystalline soft magnetic alloy, which is formed of an Fe-based nanocrystalline soft magnetic alloy in which part of Fe is replaced with Ni and/or Co, and a magnetic component using the same. Chinese patent CN201580019461 provides a Fe-based nanocrystalline alloy magnetic core, which is wound into an outer diameter of 31mm and an inner diameter of 21mm to form a ring-shaped magnetic core (height of 15 mm); chinese patent CN201680008320 discloses a magnetic core based on nanocrystalline magnetic alloy, which is a toroidal core with Outer Diameter (OD) 42.0-130.5 mm, Inner Diameter (ID) 40.0-133.0 mm, and height (H) 25.4-50.8 mm. US2016369364a1 discloses a method for producing nanocrystalline cores having dimensions phi 190mm x phi 150mm x 25mm, annealed with a stress relief. Chinese patent application 201710383666.3 discloses a distribution transformer with an iron-based nanocrystalline iron core and a method for manufacturing the iron core, wherein a plurality of layers of nanocrystalline thin strips are connected by hot pressing, and the iron-based nanocrystalline iron core is a cylindrical cavity structure with a hollow interior. Chinese patent application 201610046537.0 discloses a heat treatment method for applying a transverse magnetic field to a nanocrystalline magnetic core, wherein the size specification of the annular magnetic core is 20mm (outer diameter) × 14mm (inner diameter) × 10 (width). The Chinese patent application 201810938249.5 discloses a heat treatment method of an amorphous nanocrystalline magnetic core, and the size specification of an annular magnetic core is phi 32mm multiplied by phi 20mm multiplied by 10 mm.
Hitachi metal EP0695812A1 discloses a nanocrystalline alloy with an insulating coating and a magnetic core thereof, wherein the magnetic core is a circular magnetic core with 100mm of outer diameter and 80mm of inner diameter and has a width of 20 mm; the thickness of the insulating coating is 0.05-0.1 μm; chinese patent 201511029401.0 provides a method for precisely preparing an annular high permeability nanocrystalline magnetic core, which includes the steps of solidifying the nanocrystalline magnetic core and cutting the nanocrystalline magnetic core, wherein the diameter of the annular magnetic core is 37.9 mm.
The capacity of the transformer is substantially proportional to the sectional area of the core, and therefore the sectional area of the core of the large-capacity high-frequency transformer is larger in size. However, the nanocrystalline iron core becomes brittle after annealing, the larger the size is, the larger the microstructure unevenness is, and the difficulty in iron core preparation, transportation, winding and assembly and application caused by the brittleness problem is multiplied. Therefore, the larger the nanocrystalline iron core size, the greater the manufacturing difficulty.
In summary, the nanocrystalline iron core in the prior art is mostly annular, the maximum size of the iron core is phi 120mm x phi 60mm x h30mm and less, the iron core is basically a bare iron core or the surface and the end face of the iron core are only sprayed with glue paint, and the large-size rectangular integral dip-coated nanocrystalline iron core with the weight of 50kg or more and the size of 355mm length, 170mm width, 50mm thickness and 50mm height or more is lacked.
SUMMERY OF THE UTILITY MODEL
To the not enough and defect that prior art exists, the utility model aims to provide a rectangle nanocrystalline iron core, this iron core has big size and weight, can be used to large capacity transformer.
The utility model provides a technical scheme that technical problem adopted as follows:
a rectangular nanocrystalline iron core is formed by stacking a plurality of single rectangular nanocrystalline iron cores in the height direction, and an adhesive layer is arranged between adjacent single rectangular nanocrystalline iron cores in the plurality of single rectangular nanocrystalline iron cores; the single-rectangular nanocrystalline iron core is a hollow cuboid formed by winding nanocrystalline strips, an adhesion layer is arranged between every two adjacent nanocrystalline strip layers, and the adhesion layer is obtained in a paint dipping and curing mode; the four outer side surfaces of the hollow cuboid are connected with each other through an outer arc surface; every two of the four inner side surfaces of the hollow cuboid are connected through an inner arc surface; the periphery of the cross section of the rectangular nanocrystalline iron core is rectangular, and four edges of the rectangle are connected in pairs through arcs; the length of the rectangle is 300-800mm, and the width of the rectangle is 200-700 mm; wherein the length of the rectangle refers to the vertical distance between two short sides of the rectangle, and the width of the rectangle refers to the vertical distance between two long sides of the rectangle.
In the above rectangular nanocrystalline iron core, as a preferred embodiment, the thickness of the rectangular nanocrystalline iron core (i.e., the vertical distance between the outer side surface and the inner side surface) is 50 to 400 mm.
In the above rectangular nanocrystalline iron core, as a preferred embodiment, the radius of the outer circular arc (i.e. the radius of the chamfer between the right angles of the rectangle) is 50-200 mm.
In the above rectangular nanocrystalline iron core, as a preferred embodiment, the height of the rectangular nanocrystalline iron core is 50 to 600 mm.
In the rectangular nanocrystalline iron core, as a preferred embodiment, the material of the bonding layer is heat-conducting silica gel, epoxy resin AB gel or organic silicon heat-conducting pouring sealant.
In the above rectangular nanocrystalline iron core, as a preferred embodiment, the number of single rectangular nanocrystalline iron cores stacked in the height direction is 2 to 20.
In the rectangular nanocrystalline iron core, as a preferred embodiment, the single rectangular nanocrystalline iron core is an iron core subjected to integral paint dipping treatment.
In the above rectangular nanocrystalline iron core, as a preferred embodiment, the weight of the rectangular nanocrystalline iron core is not less than 60 kg.
In the above rectangular nanocrystalline iron core, as a preferred embodiment, the thickness of the nanocrystalline strip is 14 to 26 μm.
In the above rectangular nanocrystalline iron core, as a preferred embodiment, the single rectangular nanocrystalline iron core further includes:
the ground wire copper connecting sheet is arranged on the surface of the single-rectangular nanocrystalline iron core, the middle position of the single-rectangular nanocrystalline iron core in the thickness direction, and a connecting line between the outer arc and the center of the rectangle; and/or
And the epoxy plates are arranged on the upper surface and the lower surface of the rectangular nanocrystalline iron core.
Compared with the prior art, the utility model discloses following beneficial effect has:
(1) the utility model discloses a rectangle iron core size that coiling preparation was obtained is big, capacious.
(2) The utility model discloses a rectangular core can satisfy large capacity high frequency transformer's operation requirement, is suitable for at material and electric technical field wide application.
(3) The utility model can splice two or more iron cores into a bigger iron core, which can greatly improve the size and sectional area of the iron core, thereby improving the capacity of the nanocrystalline iron core; the high-capacity high-frequency transformer core with the capacity of 200-1000 kVA or even 3MW can be prepared in an extending way.
(4) The utility model discloses jumbo size rectangle nanocrystalline iron core has adopted the dip coating solidification technique, has effectively solved the big more, the annealing problem that becomes crisp more serious difficult problem of iron core.
(5) The utility model discloses single iron core weight is more than or equal to 20kg, and the rectangular nanocrystalline iron core weight that obtains after the concatenation is more than or equal to 60kg, iron core loss P0.5T/10kHz≤6W/kg，P0.6T/3kHz≤2.2W/kg。
Drawings
Fig. 1 is a schematic structural view of a novel nanocrystalline iron core formed by splicing three single rectangular nanocrystalline iron cores of the present invention;
fig. 2 shows the loss of the rectangular nanocrystalline iron core of this example 1 at different frequencies and operating magnetic induction; wherein, 1 is an outer side surface, 2 is an outer arc surface, 3 is an inner side surface, 4 is an inner arc surface, and 5 is an outer arc.
Detailed Description
In order to highlight the objects, technical solutions and advantages of the present invention, the present invention will be further described with reference to the following embodiments, examples of which are provided by way of illustration rather than limitation of the present invention. The technical solution of the present invention is not limited to the following specific embodiments, but also includes any combination between the specific embodiments.
The specific preparation method of the nanocrystalline rectangular iron core of the utility model is as follows:
(1) cutting the nanocrystalline strip with the width of 50mm-150mm into the strip with the required width by a roller according to the requirement, wherein the thickness of the strip is 14-26 μm;
(2) designing the length, width and height of a rectangular iron core and the length and width of a window of the high-frequency transformer according to power and application requirements;
(3) winding the strip into a designed rectangular shape by using an iron core winding machine;
(4) loading the rectangular iron core into a magnetic field annealing furnace, and adding a transverse magnetic field to perform uniform annealing;
(5) moving the annealed iron core into paint dipping equipment for integral paint dipping;
(6) after dipping paint, moving the dipped paint into a curing furnace for drying and curing;
(7) after curing, moving out, cleaning and packaging to obtain the large-size rectangular paint-dipped nanocrystalline iron core special for the single high-frequency transformer;
(8) two or more rectangular paint-dipped nanocrystalline iron cores are combined into a spliced whole in a gluing stacking mode in the height direction, and the gluing is low-stress high-heat-conducting glue;
(9) and cleaning and packaging the obtained iron core with the spliced large size of 50-600mm or more to obtain a final finished product.
(10) If the width of the used nanocrystalline strip is larger than or equal to 50mm, the rectangular paint-dipped nanocrystalline iron core can be obtained without the step (9).
(11) According to the design and the use condition of the high-frequency transformer, whether a ground wire copper connecting sheet is added at the vertex position of a single iron core and whether epoxy plates are added on the upper surface and the lower surface are determined.
In the nanocrystalline rectangular iron core, the strip with the required width is selected according to the height of the iron core of the high-frequency transformer. According to the principle of reducing working procedures and improving the efficiency of devices, the single iron core is prepared by adopting a plurality of iron cores to be spliced or a strip material with enough width according to the height determination. For example, the iron core having a height dimension of 50mm, 80mm, 100mm, 150mm, 200mm, 300mm, 400mm, or 500mm may be formed by a 50mm wide strip (single core), (40+40) mm wide strip (two-piece core splicing), or 80mm wide strip (single core), (50+ 50) mm wide strip (three-piece core splicing), or 150mm wide strip (single core), (100+100) mm wide strip (two-piece core splicing), (150+150) mm wide strip (two-piece core splicing), (100+100+ 100) mm wide strip (four-piece core splicing), or (100+100+100+100+100) mm wide strip (five-piece core splicing). The thinner the strip, the lower the loss of the nanocrystalline iron core.
The step of winding the iron core into the rectangular iron core means that the nanocrystalline strip with the preset width is loaded into a material tray of a winding device and wound to obtain the corresponding rectangular iron core.
And in the nanocrystalline rectangular iron core, the iron core and the die are placed into a magnetic field annealing furnace together for uniform annealing, and a transverse magnetic field is applied when the isothermal process is finished, wherein the magnetic field is 20-50 mT.
In the nanocrystalline rectangular iron core, the dip coating of the iron core refers to epoxy resin paint, epoxy resin AB paint and three-proofing paint, or modified epoxy resin paint and three-proofing paint;
in the nanocrystalline rectangular iron core, the adhesive is a high thermal conductive adhesive, such as a high thermal conductive silica gel, an epoxy resin AB adhesive or an organic silicon thermal conductive pouring sealant.
Example 1
A rectangular nanocrystalline iron core is a hollow cuboid formed by winding nanocrystalline strips (the thickness of the strips is 18 microns), an adhesion layer is arranged between every two adjacent nanocrystalline strip layers, and the adhesion layer is obtained in a paint dipping and curing mode; every two of the four outer side surfaces 1 of the hollow cuboid are connected through an outer arc surface 2; every two of the four inner side surfaces 3 of the hollow cuboid are connected through an inner arc surface 4; the periphery of the cross section of the rectangular nanocrystalline iron core is rectangular, and four sides of the rectangle are connected in pairs through an outer circular arc 5 (namely two adjacent sides of the four sides of the rectangle are connected through circular arcs); the length of the rectangle is 480mm, the width of the rectangle is 320mm, the thickness of the rectangular nanocrystalline iron core is 60mm, and the radius of the outer arc 5 is 60 mm;
the height of the nanocrystalline rectangular iron core is 120 mm; the iron core is formed by stacking 2 single iron cores with the height of 60mm in the height direction, bonding layers are arranged between adjacent rectangular nanocrystalline iron cores, and the total weight of the iron cores is 52kg (the weight of a single iron core is 26 kg).
Referring to fig. 2, the nanocrystalline rectangular core loss P0.5T/10kHz＝5.6W/kg，P0.6T/3kHz＝1.82W/kg。
Example 2
A rectangular nanocrystalline iron core is a hollow cuboid formed by winding nanocrystalline strips (the thickness of the strips is 16 microns), an adhesion layer is arranged between every two adjacent nanocrystalline strip layers, and the adhesion layer is obtained in a paint dipping and curing mode; every two of the four outer side surfaces 1 of the hollow cuboid are connected through an outer arc surface 2; every two of the three inner side surfaces 3 of the hollow cuboid are connected through an inner arc surface 4; the periphery of the cross section of the rectangular nanocrystalline iron core is rectangular, and four sides of the rectangle are connected in pairs through an outer circular arc 5 (namely two adjacent sides of the four sides of the rectangle are connected through circular arcs); the length of the rectangle is 390mm, the width of the rectangle is 330mm, the thickness of the rectangular nanocrystalline iron core is 50mm, and the radius of the outer arc 5 is 50 mm;
the height of the nanocrystalline rectangular iron core is 150 mm; the iron core is formed by stacking 3 single iron cores with the height of 50mm in the height direction, and bonding layers are arranged between the adjacent rectangular nanocrystalline iron cores; the total weight of the iron core is 66kg (the weight of a single iron core is 22 kg).
The nanocrystalline rectangular iron core has loss P0.5T/10kHz＝5.3W/kg，P0.6T/3kHz＝1.67W/kg。
Claims (10)
1. A rectangular nanocrystalline iron core is characterized in that the rectangular nanocrystalline iron core is formed by stacking a plurality of single rectangular nanocrystalline iron cores in the height direction, and an adhesive layer is arranged between adjacent single rectangular nanocrystalline iron cores in the plurality of single rectangular nanocrystalline iron cores; the single-rectangular nanocrystalline iron core is a hollow cuboid formed by winding nanocrystalline strips, an adhesion layer is arranged between every two adjacent nanocrystalline strip layers, and the adhesion layer is obtained in a paint dipping and curing mode; the four outer side surfaces of the hollow cuboid are connected with each other through an outer arc surface; every two of the four inner side surfaces of the hollow cuboid are connected through an inner arc surface; the periphery of the cross section of the rectangular nanocrystalline iron core is rectangular, and four edges of the rectangle are connected in pairs through an outer circular arc; the length of the rectangle is 300-800mm, and the width of the rectangle is 200-700 mm.
2. The rectangular nanocrystalline iron core according to claim 1, wherein the rectangular nanocrystalline iron core has a thickness of 50-200 mm.
3. The rectangular nanocrystalline iron core according to claim 1, wherein the outer arc has a radius of 50-200 mm.
4. The rectangular nanocrystalline iron core according to claim 1, wherein the rectangular nanocrystalline iron core has a height of 50-600 mm.
5. The rectangular nanocrystalline iron core according to claim 1, wherein the bonding layer is made of heat-conducting silica gel, epoxy resin AB glue or organosilicon heat-conducting pouring sealant.
6. The rectangular nanocrystalline iron core according to claim 1, wherein the number of the single rectangular nanocrystalline iron cores stacked in the height direction is 2 to 20.
7. The rectangular nanocrystalline iron core according to claim 1, wherein the single rectangular nanocrystalline iron core is an integrally paint-dipped iron core.
8. The rectangular nanocrystalline iron core according to claim 1, wherein the rectangular nanocrystalline iron core has a weight of 60kg or more.
9. The rectangular nanocrystalline iron core according to claim 1, wherein the nanocrystalline ribbon has a thickness of 14-26 μm.
10. The rectangular nanocrystalline iron core according to claim 1, wherein the single rectangular nanocrystalline iron core further comprises:
the ground wire copper connecting sheet is arranged on the surface of the single-rectangular nanocrystalline iron core, the middle position of the single-rectangular nanocrystalline iron core in the thickness direction, and a connecting line between the outer arc and the center of the rectangle; and/or
And the epoxy plates are arranged on the upper surface and the lower surface of the rectangular nanocrystalline iron core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022759975.6U CN213400813U (en) | 2020-11-25 | 2020-11-25 | Rectangular nanocrystalline iron core |
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| CN202022759975.6U CN213400813U (en) | 2020-11-25 | 2020-11-25 | Rectangular nanocrystalline iron core |
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| CN213400813U true CN213400813U (en) | 2021-06-08 |
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