CN115036125A - Nanocrystalline magnetic core and preparation method thereof and magnetic equipment - Google Patents
Nanocrystalline magnetic core and preparation method thereof and magnetic equipment Download PDFInfo
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- CN115036125A CN115036125A CN202210740695.1A CN202210740695A CN115036125A CN 115036125 A CN115036125 A CN 115036125A CN 202210740695 A CN202210740695 A CN 202210740695A CN 115036125 A CN115036125 A CN 115036125A
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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
- H01F41/02—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 for manufacturing cores, coils, or magnets
- H01F41/0206—Manufacturing of magnetic cores by mechanical means
- H01F41/0213—Manufacturing of magnetic circuits made from strip(s) or ribbon(s)
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B27/00—Other grinding machines or devices
- B24B27/06—Grinders for cutting-off
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
- B24B9/02—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground
- B24B9/06—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D5/00—Fine working of gems, jewels, crystals, e.g. of semiconductor material; apparatus or devices therefor
- B28D5/04—Fine working of gems, jewels, crystals, e.g. of semiconductor material; apparatus or devices therefor by tools other than rotary type, e.g. reciprocating tools
- B28D5/045—Fine working of gems, jewels, crystals, e.g. of semiconductor material; apparatus or devices therefor by tools other than rotary type, e.g. reciprocating tools by cutting with wires or closed-loop blades
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F3/00—Cores, Yokes, or armatures
- H01F3/04—Cores, Yokes, or armatures made from strips or ribbons
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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
- H01F41/005—Impregnating or encapsulating
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Abstract
The invention relates to a nanocrystalline magnetic core, a preparation method thereof and magnetic equipment, wherein the preparation method of the nanocrystalline magnetic core comprises the following steps: s1, overlapping and fixing a plurality of nanocrystalline strips to form nanocrystalline strips with preset thickness; s2, keeping the nanocrystalline strip with the preset thickness in the original shape or winding the nanocrystalline strip into a first preset shape; s3, carrying out vacuum impregnation treatment on the nanocrystalline strip wound into the preset shape in the S2, baking the impregnated nanocrystalline strip, and curing and molding the impregnated nanocrystalline strip; and S4, cutting the solidified and molded nanocrystalline strip material in the step S3 according to the required magnetic conduction direction by adopting a cutting process to form a nanocrystalline magnetic core in a second preset shape. The solidified and molded nanocrystalline strip is cut by adopting a cutting process, and the nanocrystalline magnetic core with any shape can be cut according to the requirement, so that the damage to the shape or the structure caused by the existing stamping process is avoided, and the shape limitation of the stamping process is broken through.
Description
Technical Field
The invention relates to the technical field of nanocrystalline magnetic cores, in particular to a nanocrystalline magnetic core, a preparation method thereof and magnetic equipment.
Background
With the arrival of electrification, power electronic technology has been widely applied to various corners of life, and switching power supply technology is widely used from consumer products such as mobile phone adapters and the like to electric vehicles, high-speed rails and the like, and essential magnetic components in a switching power supply circuit play a vital role in working performance. Common soft magnetic materials in power circuits mainly comprise soft magnetic ferrite, amorphous nanocrystalline, silicon steel sheets and the like, wherein the amorphous nanocrystalline material has obvious advantages in a frequency range from hundreds of hertz to hundreds of thousand of hertz due to the advantages of high stability, high magnetic permeability, high saturation magnetic flux and the like, and is more widely applied to the production of power electronic magnetic components.
The nanocrystalline magnetic cores on the market at present mainly comprise annular nanocrystalline magnetic cores and runway nanocrystalline magnetic cores, are single in shape and structure, and cannot meet the magnetism of a plurality of specific shapes or have special requirements on magnetic circuits. A nanocrystalline magnetic core processing technology with a special shape is disclosed in patent application No. 202110966855, X and patent name 'a nanocrystalline magnetic core preparation method and nanocrystalline magnetic core', wherein nanocrystalline strips are firstly adhered, then cut into a specific shape through a punching mode, and the magnetic core cut into the specific shape is positioned and adhered to form a required thickness so as to form the final shape of the nanocrystalline magnetic core. The method for producing nanocrystalline magnetic cores disclosed in this patent provides a way to prepare nanocrystalline special-shaped magnetic cores, but still has several problems: firstly, a punching mode is used for forming the adhered strip materials in the preparation method, the punching mode has strict limitation on the cutting thickness, in order to produce the magnetic core with the thickness of 10mm, large-scale punching equipment is required to be used or the formed materials are positioned and attached for multiple times to reach the required thickness, and the process is complex; next, the magnetic permeability direction of the nanocrystalline core produced in the production method is a direction parallel to the lamination of the nanocrystals (the plane perpendicular to the thickness direction in method 1, i.e., the direction in which the magnetic permeability is high, is the plane direction of the single magnetic material sheet), and it is difficult to produce a magnetic core perpendicular to the longitudinal direction in method 1, i.e., a magnetic core having a high magnetic permeability in the lamination direction.
Disclosure of Invention
The invention aims to solve the technical problems that the existing nanocrystalline magnetic core is single in shape and structure, complex in preparation method and incapable of meeting the application requirements of magnetic cores in different shapes and different magnetic conduction directions, and provides a nanocrystalline magnetic core, a preparation method thereof and magnetic equipment.
The technical scheme for solving the technical problems is as follows: a preparation method of a nanocrystalline magnetic core comprises the following steps:
s1, overlapping and fixing a plurality of nanocrystalline strips to form nanocrystalline strips with preset thickness;
s2, keeping the nanocrystalline strip with the preset thickness in the original shape or winding the nanocrystalline strip into a first preset shape;
s3, performing vacuum impregnation treatment on the nanocrystalline strip wound into the preset shape in the S2, baking the impregnated nanocrystalline strip, and curing and molding the impregnated nanocrystalline strip;
and S4, cutting the solidified and molded nanocrystalline strip material in the step S3 according to the required magnetic conduction direction by adopting a cutting process to form a nanocrystalline magnetic core in a second preset shape.
The invention has the beneficial effects that: according to the preparation method of the nanocrystalline magnetic core, nanocrystalline strips are overlapped and fixed according to a preset thickness, then the overall shape design is carried out according to the final requirement (the most material-saving or most easy cutting and other factors can be considered), then solidification is carried out, and cutting is carried out according to the required magnetic conduction direction after solidification, so that the nanocrystalline magnetic core materials with various complex shapes and specific magnetic conduction direction characteristics are produced. And the solidified and molded nanocrystalline strip is cut by adopting a cutting process, so that the constraint of the shape of the nanocrystalline magnetic core is greatly reduced, the nanocrystalline magnetic core with any shape can be cut according to the requirement, the damage to the shape or the structure possibly caused by the existing stamping process is avoided, and the shape limitation of the stamping process is broken through. The preparation method can be used for carrying out more design exploration on the shape structure and the like of the nanocrystalline magnetic core, carrying out design in the initial winding and forming stage and the later cutting reverse direction, and realizing the possibility of designing the magnetic material with a complex magnetic circuit.
On the basis of the technical scheme, the invention can be further improved as follows.
Further, the cutting process in S4 includes at least one of a wheel cutting process and a wire cutting process.
The beneficial effect of adopting the further scheme is that: and the nanocrystalline magnetic core with a simple shape can be cut by adopting a grinding wheel cutting process, and only simple polishing and chamfering treatment is needed after cutting.
Further, after the nanocrystalline strip solidified and molded in the step S3 is cut by using the grinding wheel cutting process, polishing and chamfering are performed on the edges and corners formed by cutting.
Further, after the nanocrystalline strip solidified and molded in the step S3 is cut by using the wire cutting process, a cutting surface formed by wire cutting is physically polished, and an ablation part caused by wire cutting is removed.
The beneficial effect of adopting the further scheme is that: for the nanocrystalline magnetic core with complex shape to be cut, a linear cutting process can be adopted for cutting, and the cutting speed is strictly controlled by using slow-moving wire or medium-moving wire or fast-moving wire in the linear cutting process, so that the nanocrystalline magnetic core material and the impregnation curing material are prevented from generating magnetism due to uneven thermal expansionCore fragmentation, generally by a medium-speed wire-feeding process, with a specific wire-feeding speed of 1500mm 2 /h～2500mm 2 H, optionally, the wire speed is 1500mm 2 /h、1600mm 2 /h、 1700mm 2 /h、1800mm 2 /h、1900mm 2 /h、2000mm 2 /h、2100mm 2 /h、2200mm 2 /h、 2300mm 2 /h、2400mm 2 /h、2500mm 2 H is the ratio of the total weight of the catalyst to the total weight of the catalyst. Because the wire-cut surface is ablated by electric sparks, the insulation characteristic between layers of the nanocrystalline magnetic core is damaged, and the overall performance of the magnetic core is affected, the wire-cut surface needs to be physically polished, and the ablated part is removed.
Further, S5, the cut nanocrystalline magnetic core is subjected to surface painting treatment.
A nanocrystalline magnetic core is prepared by the preparation method of the nanocrystalline magnetic core.
The nanocrystalline magnetic core is manufactured by firstly curing and then cutting, can be used for preparing nanocrystalline magnetic cores in various shapes, can be applied to more magnetic equipment, is not limited to a ring inductor, and can be designed into various shapes such as an E shape and a tank shape, so that the volume of the existing magnetic core only using a ferrite magnetic core is greatly reduced, and the power density is improved.
Further, the shape of the nanocrystalline magnetic core includes at least one of a U-shaped structure, an E-shaped structure, a can-shaped structure, and an arc-shaped structure.
The beneficial effect of adopting the further scheme is that: the nanocrystalline magnetic core may be cut into any shape as desired.
A magnetic device is made of the nanocrystalline magnetic core.
Compared with a PC95 ferrite core, the magnetic device of the invention has smaller volume and is less prone to saturation by adopting the nanocrystalline core.
Further, the magnetic device comprises a wireless power transfer device; the wireless electric energy transmission equipment comprises a base and a plurality of first nanocrystalline magnetic cores, wherein the first nanocrystalline magnetic cores are of U-shaped structures, the base is annular, an annular assembling groove is formed in the base, the first nanocrystalline magnetic cores are arranged in sequence in the assembling groove, and the first nanocrystalline magnetic cores are multiple in the direction of the notch of the assembling groove, and the opening ends of the U-shaped structures of the first nanocrystalline magnetic cores face towards the notch of the assembling groove.
The beneficial effect of adopting the further scheme is that: taking the coupler of the wireless power transmission equipment as an example, in order to achieve the same inductance value, the volume of the nanocrystalline magnetic core cut by using the method is about 1/2 of the volume of the ferrite magnetic core using PC95, and the nanocrystalline magnetic core is less prone to saturation.
Further, the first nanocrystalline magnetic core of the U-shaped structure is provided with a first U-shaped groove wall and a second U-shaped groove wall which are arranged in parallel at intervals, the length of the second U-shaped groove wall along the opening direction of the U-shaped structure is larger than that of the first U-shaped groove wall along the opening direction of the U-shaped structure, and the openings at the two ends of the plurality of first nanocrystalline magnetic cores are sequentially and closely arranged in the assembling groove.
The beneficial effect of adopting the further scheme is that: the U-shaped groove walls of the U-shaped nanocrystalline magnetic cores are long and short, so that the whole body is in an isosceles trapezoid structure when overlooked, and a plurality of U-shaped nanocrystalline magnetic cores are conveniently arranged in the assembling groove of the base to form a compact annular structure.
Further, magnetic equipment includes switching power supply equipment, switching power supply equipment includes two second nanocrystalline magnetic cores, the second nanocrystalline magnetic core is E type structure, the intermediate structure of the second nanocrystalline magnetic core of E type structure is protruding, and the lock is corresponded to the opening of the second nanocrystalline magnetic core of two E type structures, and it has high frequency inductance to wind on the arch in the middle of the second nanocrystalline magnetic core of two E type structures.
The beneficial effect of adopting the further scheme is that: taking a switching power supply device as an example, the relative permeability of a traditional ferrite material (such as an east magnetic DRM95 material) with the same size is about 3300, and the permeability of a nanocrystalline core can reach 3 times, so that the number of turns required to reach the same inductance value is less, and on the other hand, the saturated magnetic flux density of the nanocrystalline core is more than 2 times of that of the DRM95 material, so that the working current of the inductor can be increased by more than 3 times, and in addition, the curie temperature of the nanocrystalline core can reach 400 ℃, so that the nanocrystalline core can have better performance in a high-temperature environment.
Drawings
FIG. 1 is a schematic view of a nanocrystalline ribbon wound into a first shape according to the present invention;
FIG. 2 is a schematic view of a second shape of the nanocrystalline ribbon wound according to the present invention;
FIG. 3 is a schematic view of a third shape of the nanocrystalline ribbon wound according to the present invention;
FIG. 4 is a schematic top view of a first nano-crystalline magnetic core of U-shaped configuration of the present invention after painting and polishing;
FIG. 5 is a schematic structural view of a first nanocrystalline magnetic core of a U-shaped structure after being painted and polished;
FIG. 6 is a schematic left-side view of a first nanocrystalline magnetic core of a U-shaped structure of the present invention after being painted and polished;
FIG. 7a is a first schematic diagram illustrating a process for fabricating a second nanocrystalline magnetic core of an E-type configuration in accordance with the present invention;
FIG. 7b is a second schematic diagram illustrating a second process for fabricating a second nanocrystalline magnetic core of the E-type structure in accordance with the present invention;
FIG. 7c is a third schematic diagram illustrating a process for fabricating a second nanocrystalline magnetic core of an E-type configuration in accordance with the present invention;
FIG. 7d is a fourth schematic diagram illustrating a second nanocrystalline magnetic core of type E according to the present invention;
FIG. 8 is a schematic perspective view of a third nanocrystalline magnetic core of arcuate configuration in accordance with the present invention;
fig. 9 is a schematic front view of a wireless power transmission apparatus according to the present invention;
fig. 10 is a schematic cross-sectional view illustrating a wireless power transmission apparatus according to the present invention;
fig. 11 is a schematic perspective view of a high-frequency inductor for a switching power supply device according to the present invention;
FIG. 12 is a first process flow diagram of a method for fabricating a nanocrystalline magnetic core according to the present invention;
fig. 13 is a schematic process flow diagram of a method for manufacturing a nanocrystalline magnetic core according to the present invention.
In the drawings, the components represented by the respective reference numerals are listed below:
1. a first nanocrystalline magnetic core; 11. a first U-shaped groove wall; 12. a second U-shaped groove wall; 2. a second nanocrystalline magnetic core; 21. a protrusion; 3. a third nanocrystalline magnetic core; 4. a base.
A. The direction of the grain;
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
Example 1
As shown in fig. 12, the method for manufacturing a nanocrystalline magnetic core according to this embodiment includes the following steps:
s1, overlapping and fixing a plurality of nanocrystalline strips to form nanocrystalline strips with preset thickness;
s2, keeping the nanocrystalline strip with the preset thickness or winding the nanocrystalline strip into a first preset shape;
s3, performing vacuum impregnation treatment on the nanocrystalline strip wound into the preset shape in the S2 to enable an impregnation liquid to be impregnated into gaps of the nanocrystalline strip, baking the impregnated nanocrystalline strip, and curing and molding the impregnated nanocrystalline strip;
and S4, cutting the solidified and molded nanocrystalline strip material in the step S3 according to the required magnetic conduction direction by adopting a cutting process to form a nanocrystalline magnetic core in a second preset shape.
Specifically, the first preset shape of the embodiment may be any shape as long as the requirements of the subsequent process can be met. For example, the shape may be square, as shown in fig. 1, so as to facilitate the subsequent formation of an L-shaped nanocrystalline magnetic core; may be circular, as shown in fig. 2, so as to form the arc-shaped nanocrystalline magnetic core subsequently; may be curved as shown in fig. 3 to facilitate subsequent formation of an arcuate nanocrystalline core.
In a preferable aspect of this embodiment, the cutting process in S4 includes at least one of a grinding wheel cutting process and a wire cutting process. The grinding wheel cutting is to grind a required cutting surface by using a grinding wheel grinding tool. The wire cutting is to use a wire cutting machine to set the cutting sequence and coordinates of the target shape and then perform wire cutting. And for the nanocrystalline magnetic core with a simple shape, cutting can be carried out by adopting a grinding wheel cutting process, and only simple polishing and chamfering treatment is needed after cutting.
Optionally, after the nanocrystalline ribbon solidified and molded in S3 is cut by using the grinding wheel cutting process, polishing and chamfering are performed on the edges and corners formed by cutting.
Optionally, after the nanocrystalline ribbon solidified and molded in S3 is cut by using the wire cutting process, a cut surface formed by wire cutting is physically polished, and an ablation part caused by wire cutting is removed. For the nanocrystalline magnetic core with a complex shape needing to be cut, a linear cutting process can be adopted for cutting, and slow-speed wire or fast-speed wire is used in the linear cutting process to strictly control the cutting speed, so that the nanocrystalline magnetic core material and the impregnation curing material are prevented from being heated and expanded unevenly to cause the fragmentation of the magnetic core. Because the wire-cut surface is ablated by electric sparks, the insulation characteristic between layers of the nanocrystalline magnetic core is damaged, and the overall performance of the magnetic core is affected, the wire-cut surface needs to be physically polished, and the ablated part is removed. The physical polishing method can be a grinding wheel or sand paper for polishing. The two standard process methods of wire cutting are slow wire cutting, medium wire cutting and fast wire cutting, and the cutting speed needs to be adjusted according to actual conditions.
In a preferred embodiment of this embodiment, as shown in fig. 13, the preparation method further includes S5, performing a surface painting process on the cut nanocrystalline magnetic core.
The method of the embodiment is adopted to prepare the first nanocrystalline magnetic core 1 with the U-shaped structure, and a plurality of nanocrystalline strips can be overlapped and fixed to form a nanocrystalline strip with a preset thickness; keeping the nanocrystalline strip with the preset thickness in an original state; carrying out vacuum impregnation treatment on the nanocrystalline strip with a preset thickness, baking the impregnated nanocrystalline strip, and curing and molding the impregnated nanocrystalline strip; cutting a cured and molded nanocrystalline strip into common columnar nanocrystalline magnetic core blocks by adopting a linear cutting process, then cutting along a texture direction A to form a U-shaped groove, wherein the magnetic conduction direction is a U-shaped section, finally cutting at the opening end of the U-shaped groove to form an isosceles trapezoid, physically polishing the cutting surface of the cut nanocrystalline magnetic core, removing the linear cutting ablation part, and then spraying paint to form a first nanocrystalline magnetic core 1 with a U-shaped structure, as shown in figures 4-6.
The method of the embodiment is adopted to prepare the second nanocrystalline magnetic core 2 with the E-shaped structure, and a plurality of nanocrystalline strips can be overlapped and fixed to form a nanocrystalline strip with a preset thickness; keeping the nanocrystalline strip with the preset thickness in an original state; carrying out vacuum impregnation treatment on the nanocrystalline strip with a preset thickness, baking the impregnated nanocrystalline strip, and curing and molding the impregnated nanocrystalline strip as shown in fig. 7 a; cutting the solidified and formed nanocrystalline strip into small blocks by adopting a linear cutting process, as shown in fig. 7b, then cutting along the direction vertical to the texture direction to form an E-shaped structure, as shown in fig. 7c, physically polishing the cutting surface of the cut nanocrystalline magnetic core, removing the linear cutting ablation part, then spraying paint, as shown in fig. 7d, and forming a second nanocrystalline magnetic core 2 with the E-shaped structure.
The third nanocrystalline magnetic core 3 with the arc-shaped structure is prepared by the method of the embodiment, and a plurality of nanocrystalline strips can be overlapped and fixed to form a nanocrystalline strip with a preset thickness; winding the nanocrystalline strip with a preset thickness into a circular ring shape or a curve shape, as shown in fig. 2 or fig. 3; carrying out vacuum impregnation treatment on the nanocrystalline strip with a preset thickness, baking the impregnated nanocrystalline strip, and curing and molding the impregnated nanocrystalline strip; cutting along the direction perpendicular to the grain direction by adopting a grinding wheel cutting process to form an arc-shaped structure, and polishing and chamfering edges and corners of the cut nanocrystalline magnetic core as shown in fig. 8 to form a third nanocrystalline magnetic core 3 with the arc-shaped structure.
According to the preparation method of the nanocrystalline magnetic core, the nanocrystalline strip is overlapped and fixed according to the preset thickness, then the overall shape design is carried out according to the final requirement (the most material-saving or most easy cutting and other factors can be considered), then the nanocrystalline magnetic core is solidified, and then the nanocrystalline magnetic core is cut according to the required magnetic conduction direction after the nanocrystalline strip is solidified, so that the nanocrystalline magnetic core material with various complex shapes and specific magnetic conduction direction characteristics is produced. And the solidified and molded nanocrystalline strip is cut by adopting a cutting process, so that the constraint of the shape of the nanocrystalline magnetic core is greatly reduced, the nanocrystalline magnetic core in any shape can be cut according to the requirement, the damage to the shape or structure possibly caused by the existing stamping process is avoided, and the shape limitation of the stamping process is broken through. The preparation method can be used for carrying out more design exploration on the shape structure and the like of the nanocrystalline magnetic core, and can realize the possibility of designing a magnetic material with a complex magnetic circuit by carrying out design in the initial winding forming stage and the later cutting reverse direction.
Example 2
A nanocrystalline magnetic core according to this example was produced by the method of producing a nanocrystalline magnetic core according to example 1 above.
The shape of the nanocrystalline magnetic core of this embodiment includes at least one of a U-shaped structure, an E-shaped structure, a can-shaped structure, and an arc-shaped structure. The nanocrystalline magnetic core may be cut into any shape as desired.
Specifically, the U-shaped nanocrystalline magnetic cores are shown in fig. 4 to 6. Nanocrystalline magnetic cores of the E-type structure are shown in fig. 7c and 7 d. The nanocrystalline magnetic core of the arc structure is shown in fig. 8.
The relative magnetic permeability of common power ferrite (such as PC95) is about 3300, and the nanocrystalline magnetic core of the embodiment can reach 10000, so that the coil turns required by the same inductance value are less, and the whole volume can be reduced; meanwhile, the saturation magnetic flux of the PC95 is about 0.55T, the nanocrystalline magnetic core of the embodiment can reach 1.5T, and the sectional area of the magnetic core required under the same magnetic flux is smaller.
The nanocrystalline magnetic core of this embodiment adopts solidification earlier, the back cutting is made, can prepare the nanocrystalline magnetic core of various shapes, can be applied to high-performance nanocrystalline magnetic core in more magnetic equipment, not only is limited to annular inductance, can also design into various shapes such as E type, jar type, greatly reduced current magnetic core volume that can only use ferrite core, improve power density.
Example 3
As shown in fig. 9 and 10, a magnetic device of the present embodiment is made using the above-described nanocrystalline magnetic core. The magnetic device of the present embodiment, which uses the above-mentioned nanocrystalline core, is smaller in size and less prone to saturation than a PC95 ferrite core.
The nanocrystal core of the present embodiment can be applied to various magnetic devices, for example, to a radio transmission device, a switching power supply device, and the like.
The first embodiment is as follows: the magnetic device comprises a wireless power transfer device; wireless power transmission equipment includes base 4 and a plurality of first nanocrystalline magnetic core 1, first nanocrystalline magnetic core 1 is U type structure, base 4 is the annular, be equipped with annular assembly groove on the base 4, it is a plurality of first nanocrystalline magnetic core 1 arranges in proper order in the assembly groove, it is a plurality of the U type structure opening end of first nanocrystalline magnetic core 1 all faces the notch direction of assembly groove. Taking a coupler of a wireless power transmission device as an example, in order to achieve the same inductance value, the volume of the nanocrystalline magnetic core cut by using the method is about 1/2 of the volume of a ferrite magnetic core using PC95, and the nanocrystalline magnetic core is less prone to saturation.
Further, the first nanocrystalline magnetic core 1 of the U-shaped structure is provided with a first U-shaped groove wall 11 and a second U-shaped groove wall 12 which are arranged at intervals in parallel, the length of the second U-shaped groove wall 12 along the opening direction of the U-shaped structure is greater than the length of the first U-shaped groove wall 11 along the opening direction of the U-shaped structure, and the openings at the two ends of the plurality of first nanocrystalline magnetic cores 1 are sequentially and closely arranged in the assembling groove. The U-shaped groove wall of the nanocrystalline magnetic core with the U-shaped structure is long and short, so that the whole body is overlooked to be in an isosceles trapezoid structure, and the nanocrystalline magnetic cores with a plurality of U-shaped structures are conveniently arranged in the assembly groove of the base to form a compact annular structure.
The second embodiment is as follows: as shown in fig. 11, the magnetic device includes a switching power supply device, the switching power supply device includes two second nanocrystalline magnetic cores 2, the second nanocrystalline magnetic cores 2 are of an E-type structure, the middle structure of the second nanocrystalline magnetic core 2 of the E-type structure is a protrusion 21, the openings of the second nanocrystalline magnetic cores 2 of the two E-type structures are correspondingly buckled, and a high-frequency inductor is wound around the protrusion 21 in the middle of the second nanocrystalline magnetic cores 2 of the two E-type structures. Taking the high-frequency inductor wound by the second nanocrystalline magnetic core 2 with the E-shaped structure as an example, the high-frequency inductor can be used as a resonance inductor in an inverter circuit. For E-type magnetism with the same size, the relative permeability of a traditional ferrite material (such as east magnetic DRM95 material) is about 3300, the permeability of a nanocrystalline magnetic core can reach 3 times, so that the number of turns needed for reaching the same inductance value is less, and on the other hand, the saturated magnetic flux density of the nanocrystalline magnetic core is more than 2 times of that of DRM95 material, so that the working current of the inductor can be improved by more than 3 times, and in addition, the Curie temperature of the nanocrystalline magnetic core can reach 400 ℃, so that the nanocrystalline magnetic core can have better performance in a high-temperature environment.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, but are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "above," and "over" a second feature may be directly on or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A method for preparing a nanocrystalline magnetic core is characterized by comprising the following steps:
s1, overlapping and fixing a plurality of nanocrystalline strips to form nanocrystalline strips with preset thickness;
s2, keeping the nanocrystalline strip with the preset thickness in the original shape or winding the nanocrystalline strip into a first preset shape;
s3, carrying out vacuum impregnation treatment on the nanocrystalline strip wound into the preset shape in the S2, baking the impregnated nanocrystalline strip, and curing and molding the impregnated nanocrystalline strip;
and S4, cutting the solidified and molded nanocrystalline strip material in the step S3 according to the required magnetic conduction direction by adopting a cutting process to form a nanocrystalline magnetic core in a second preset shape.
2. The method of claim 1, wherein the cutting process in the step S4 includes at least one of a grinding wheel cutting process and a wire cutting process.
3. The method for preparing a nanocrystalline magnetic core according to claim 2, wherein the grinding wheel cutting process is adopted to cut the nanocrystalline strip solidified and molded in S3, and then polishing and chamfering are performed on the edges and corners formed by cutting.
4. The method for preparing a nanocrystalline magnetic core according to claim 2, wherein after the nanocrystalline ribbon solidified and molded in S3 is cut by the wire cutting process, a cut surface formed by the wire cutting is physically ground, and an ablated part caused by the wire cutting is removed.
5. The method for preparing a nanocrystalline magnetic core according to claim 1, further comprising S5, performing surface painting treatment on the cut nanocrystalline magnetic core.
6. A nanocrystalline magnetic core, characterized by, use a method of manufacturing nanocrystalline magnetic core as claimed in claims 1 to 5; the shape of the nanocrystalline magnetic core comprises at least one of a U-shaped structure, an E-shaped structure, a tank-shaped structure and an arc-shaped structure.
7. A magnetic device made using the nanocrystalline core of claim 6.
8. The magnetic device of claim 7, wherein the magnetic device comprises a wireless power transfer device; the wireless electric energy transmission equipment comprises a base and a plurality of first nanocrystalline magnetic cores, wherein the first nanocrystalline magnetic cores are of U-shaped structures, the base is annular, an annular assembling groove is formed in the base, the first nanocrystalline magnetic cores are arranged in sequence in the assembling groove, and the first nanocrystalline magnetic cores are multiple in the direction of the notch of the assembling groove, and the opening ends of the U-shaped structures of the first nanocrystalline magnetic cores face towards the notch of the assembling groove.
9. The magnetic device as claimed in claim 8, wherein the first nanocrystalline magnetic core of the U-shaped structure has a first U-shaped groove wall and a second U-shaped groove wall which are arranged in parallel and spaced apart, the length of the second U-shaped groove wall along the opening direction of the U-shaped structure is greater than the length of the first U-shaped groove wall along the opening direction of the U-shaped structure, and the openings at both ends of the plurality of first nanocrystalline magnetic cores are arranged in the assembly groove in close proximity in sequence.
10. The magnetic device according to claim 7, wherein the magnetic device comprises a switching power supply device, the switching power supply device comprises two second nanocrystalline magnetic cores, the second nanocrystalline magnetic cores are in an E-shaped structure, the middle structures of the second nanocrystalline magnetic cores in the E-shaped structure are protrusions, the openings of the second nanocrystalline magnetic cores in the two E-shaped structures are correspondingly buckled, and a high-frequency inductor is wound on the protrusion in the middle of the second nanocrystalline magnetic cores in the two E-shaped structures.
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