CN117831907B - High resistivity inductor - Google Patents
High resistivity inductor Download PDFInfo
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- CN117831907B CN117831907B CN202410053586.1A CN202410053586A CN117831907B CN 117831907 B CN117831907 B CN 117831907B CN 202410053586 A CN202410053586 A CN 202410053586A CN 117831907 B CN117831907 B CN 117831907B
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- 238000004804 winding Methods 0.000 claims abstract description 122
- 239000000843 powder Substances 0.000 claims abstract description 100
- 229910002555 FeNi Inorganic materials 0.000 claims abstract description 43
- 229920005989 resin Polymers 0.000 claims description 59
- 239000011347 resin Substances 0.000 claims description 59
- 239000011812 mixed powder Substances 0.000 claims description 39
- 239000000203 mixture Substances 0.000 claims description 37
- 239000002245 particle Substances 0.000 claims description 19
- 229920002050 silicone resin Polymers 0.000 claims description 16
- 239000011247 coating layer Substances 0.000 claims description 14
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 claims description 11
- 239000010410 layer Substances 0.000 claims description 10
- 239000012299 nitrogen atmosphere Substances 0.000 claims description 9
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 7
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 7
- 230000001939 inductive effect Effects 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 7
- 230000006698 induction Effects 0.000 abstract description 4
- 238000013461 design Methods 0.000 abstract description 3
- 229910005347 FeSi Inorganic materials 0.000 description 22
- 229910052710 silicon Inorganic materials 0.000 description 17
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 13
- 239000010703 silicon Substances 0.000 description 13
- 239000002159 nanocrystal Substances 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 4
- 238000009413 insulation Methods 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 3
- 238000000137 annealing Methods 0.000 description 2
- 229910010293 ceramic material Inorganic materials 0.000 description 2
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/24—Magnetic cores
- H01F27/255—Magnetic cores made from particles
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
- H01F1/147—Alloys characterised by their composition
- H01F1/14708—Fe-Ni based alloys
- H01F1/14733—Fe-Ni based alloys in the form of particles
- H01F1/14741—Fe-Ni based alloys in the form of particles pressed, sintered or bonded together
- H01F1/1475—Fe-Ni based alloys in the form of particles pressed, sintered or bonded together the particles being insulated
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
- H01F1/147—Alloys characterised by their composition
- H01F1/14766—Fe-Si based alloys
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
- H01F1/147—Alloys characterised by their composition
- H01F1/14766—Fe-Si based alloys
- H01F1/14791—Fe-Si-Al based alloys, e.g. Sendust
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
- H01F1/147—Alloys characterised by their composition
- H01F1/153—Amorphous metallic alloys, e.g. glassy metals
- H01F1/15333—Amorphous metallic alloys, e.g. glassy metals containing nanocrystallites, e.g. obtained by annealing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
- H01F1/147—Alloys characterised by their composition
- H01F1/153—Amorphous metallic alloys, e.g. glassy metals
- H01F1/15358—Making agglomerates therefrom, e.g. by pressing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
- H01F27/306—Fastening or mounting coils or windings on core, casing or other support
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- Engineering & Computer Science (AREA)
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- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Dispersion Chemistry (AREA)
- Crystallography & Structural Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Coils Or Transformers For Communication (AREA)
- Hard Magnetic Materials (AREA)
Abstract
The application relates to the technical field of electronic equipment, in particular to a high-resistivity inductor, which comprises a magnet and a winding, wherein the winding is distributed in the magnet, and meanwhile, the winding extends out of the magnet to form an electrode, so that the high-resistivity inductor does not need to be electroplated with other materials to reduce the contact resistance among materials, and the magnet consists of Fe-based nanocrystalline and one or more of FeSiAl powder, feSi powder and FeNi powder. In the high-resistivity inductor provided by the application, the high-resistivity inductor is designed through structural design and material proportioning, so that the technical problem that the inductor loss is increased due to large induction current caused by small resistivity of the traditional inductor is solved.
Description
Technical Field
The application relates to the technical field of electronic equipment, in particular to a high-resistivity inductor.
Background
With the continuous improvement of the computing power of the AI server, the power of a core computing chip is greatly improved along with the improvement of the computing power, and the current is continuously increased, so that the induction current of a magnet in an inductor in a circuit is rapidly increased, and the heating problem is more and more serious.
The resistivity of the inductor needs to be increased when the induced current is reduced, and as the alloy magnet in the traditional inductor is often coated by ceramic materials such as phosphide or talcum powder, the resistivity of the ceramic materials such as phosphide and talcum powder is relatively low, the coating density is small, the resistivity is further reduced, the induced current of the inductor is larger, and the loss of the inductor is further increased.
Disclosure of Invention
The application provides a high-resistivity inductor, which aims to solve the technical problems that the conventional inductor has small resistivity and causes large induction current, and the loss of the inductor is increased.
In order to solve the technical problems, the application adopts a technical scheme that: there is provided a high resistivity inductor, the high resistivity inductor comprising: a magnet and a winding;
The windings are distributed inside the magnet while the windings extend out of the magnet to form electrodes, so that the high-resistivity inductor does not need to be plated with other materials to reduce contact resistance between materials;
The magnet consists of one or more of Fe-based nanocrystalline, feSiAl powder, feSi powder and FeNi powder.
Optionally, the winding includes a winding extension part, a winding oblique line part and a winding straight line part, wherein an included angle between the winding extension part and the winding oblique line part is 110-170 degrees so as to reduce the risk of cracking of the magnet caused by residual stress release caused by winding processing in the working process of the winding and reduce fluctuation of an inductance value.
Optionally, the length ratio of the winding oblique line part to the winding straight line part is 1:1-5:1, so as to reduce the stress concentration problem caused by the thermal effect.
Optionally, the edge of the magnet is spaced from the linear portion of the winding by a distance greater than 0.2mm.
Optionally, the Fe-based nanocrystalline comprises 76.5-82wt% of Fe, 7.0-9.5wt% of Si, 1.5-2.5wt% of Al, 6.0-8.0wt% of B, 1.5-2.5wt% of P and 0.5-1.5wt% of Cu.
Optionally, the powder granularity of the Fe-based nanocrystalline is 5-25 um, and the surface of the powder of the Fe-based nanocrystalline is provided with an oxide layer of 20-50 nm.
Optionally, a silicon oxide or aluminum oxide coating layer is arranged on the surface of the FeSiAl powder and/or the FeSi powder and/or the FeNi powder, the thickness of the coating layer is more than 10nm, and the granularity of the FeSiAl powder and/or the FeSi powder and/or the FeNi powder is 0.7-3.5 um.
Optionally, the high-resistivity inductor further comprises a silicone resin or a silica sol, wherein the mass of the silicone resin or the silica sol is 1.0-1.5 wt% of the total mass of the FeSiAl powder and/or the FeSi powder and/or the FeNi powder.
Optionally, the silicon resin or silica sol and the FeSiAl powder and/or FeSi powder and/or FeNi powder form agglomerate grains with the granularity of 10-20 um, the agglomerate grains, a resin mixture and Fe-based nanocrystalline are graded to form mixed powder, the mixed powder contains the resin mixture with the content of 0.7wt% -1.5wt%, and the resin mixture is one or more of polyvinyl butyral resin, organic silicon resin and silicone resin.
Optionally, the resin mixture forms an inductive green body with the magnet and the winding under a pressure of 1500-2000 MPa, and the high-resistivity inductor is formed by annealing under a nitrogen atmosphere of 0.5-1.5H at 450-600 ℃.
The beneficial effects of the application are as follows: in the high-resistivity inductor provided by the application, the high-resistivity inductor is designed through structural design and material proportioning, so that the technical problem that the inductor loss is increased due to large induction current caused by small resistivity of the traditional inductor is solved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:
FIG. 1 is a cross-sectional view of a high resistivity inductor according to an embodiment of the present application;
Fig. 2 is a cross-sectional view of a structure of a high resistivity inductor according to an embodiment of the present application.
Reference numerals illustrate: 1. a magnet; 2. a winding; 3. a winding straight line portion; 4. winding diagonal line parts; 5. and a winding extension.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art without making any inventive effort, are intended to be within the scope of the present application.
It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present application, the directional indications are merely used to explain the relative positional relationship, movement, etc. between the components in a specific gesture (as shown in the drawings), and if the specific gesture is changed, the directional indications are correspondingly changed.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present application, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present application.
As shown in fig. 1 to 2, the present application provides a high-resistivity inductor including a magnet 1 and a winding 2, the winding 2 being distributed inside the magnet 1, while the winding 2 extends outside the magnet 1 to form an electrode.
The winding 2 comprises a winding extension part 5, a winding oblique line part 4 and a winding straight line part 3, wherein an included angle between the winding extension part 5 and the winding oblique line part 4 is 110-170 degrees, the length ratio of the winding oblique line part 4 to the winding straight line part 3 is 1:1-5:1, and the distance between the edge of the magnet 1 and the winding straight line part 3 is more than 0.2mm.
The magnet 1 is composed of one or more of Fe-based nanocrystalline and FeSiAl and/or FeSi and/or FeNi powder, wherein the Fe-based nanocrystalline comprises 76.5-82wt% of Fe, 7.0-9.5wt% of Si, 1.5-2.5wt% of Al, 6.0-8.0wt% of B, 1.5-2.5wt% of P and 0.5-1.5wt% of Cu. Wherein the powder granularity of the Fe-based nanocrystalline is 5-25 um, and the surface of the powder of the Fe-based nanocrystalline is provided with an oxide layer of 20-50 nm.
The high-resistivity inductor further comprises silicon resin or silica sol, wherein the mass of the silicon resin or the silica sol is 1.0wt% -1.5wt% of the total mass of FeSiAl powder and/or FeSi powder and/or FeNi powder.
The silicon resin or the silica sol and FeSiAl powder and/or FeSi powder and/or FeNi powder form agglomerated particles with the granularity of 10-20 um, the agglomerated particles, a resin mixture and Fe-based nanocrystalline are graded to form mixed powder, the mixed powder contains 0.7wt% -1.5wt% of the resin mixture, the resin mixture is one or more of polyvinyl butyral resin, organic silicon resin and silicone resin, and the mass of the Fe-based nanocrystalline accounts for 25wt% -55wt% of the mixed powder.
The surface of FeSiAl powder and/or FeSi powder and/or FeNi powder is provided with a layer of silicon oxide or aluminum oxide coating, wherein the thickness of the coating is more than 10nm, and the granularity of the FeSiAl powder and/or FeSi powder and/or FeNi powder is 0.7-3.5 um.
The resin mixture forms an inductor blank with the magnet 1 and the winding 2 under a pressure of 1500MPa to 2000MPa, and the inductor with high resistivity is formed by annealing under a nitrogen atmosphere of 0.5 to 1.5H at 450 to 600 ℃.
In specific example 1:
A high resistivity inductor is composed of a magnet 1 and a winding 2, wherein the winding 2 is distributed inside the magnet 1, while the winding 2 extends outside the magnet 1 to form an electrode with a length of 0.3mm.
The winding 2 comprises a winding extension part 5, a winding oblique line part 4 and a winding straight line part 3, wherein the angle between the winding extension part 5 and the winding oblique line part 4 is 110 degrees, the length ratio of the winding oblique line part 4 to the winding straight line part 3 is 1:1, and the distance from the edge of the magnet 1 to the winding straight line part 3 is 0.6mm.
The magnet 1 is composed of Fe-based nanocrystals and FeSiAl powder, wherein the components of the Fe-based nanocrystals are 82wt% Fe, 7.0wt% Si, 1.5wt% Al, 6.0wt% B, 1.5wt% P, 0.5wt% Cu, the powder particle size of the Fe-based nanocrystals is 5-25 um, and the powder surface of the Fe-based nanocrystals has an oxide layer of 50 nm.
The FeSiAl powder and the silicon resin accounting for 1.0wt% of the mass of the FeSiAl powder form agglomerated particles with the granularity of 20um, and the agglomerated particles are graded with Fe-based nanocrystalline and a resin mixture to form mixed powder, wherein the mass of the Fe-based nanocrystalline accounts for 25wt% of the mass of the mixed powder. The FeSiAl powder comprises 83wt% of Fe, 10wt% of Si and 7wt% of Al, wherein a layer of aluminum oxide coating layer is arranged on the surface of the FeSiAl powder, the thickness of the coating layer is 20nm, and the granularity of the FeSiAl powder is 3.5um.
The mixed powder also contains 0.7 weight percent of resin mixture, wherein the resin mixture is a mixed resin containing polyvinyl butyral resin and organic silicon resin, the mass of the polyvinyl butyral resin accounts for 0.5 weight percent of the mass of the mixed powder, and the mass of the organic silicon resin accounts for 0.2 weight percent of the mass of the mixed powder.
The resin mixture was formed into an inductor blank with magnet 1 and winding 2 at a pressure of 1500MPa and annealed by a nitrogen atmosphere of 0.5H at 600 c to form the final inductor.
In specific example 2:
The high resistivity inductor is composed of a magnet 1 and a winding 2, wherein the winding 2 is distributed inside the magnet 1, and the winding 2 extends outside the magnet 1 to form an electrode with a length of 2mm.
The winding 2 comprises a winding extension part 5, a winding oblique line part 4 and a winding straight line part 3, wherein an included angle between the winding extension part 5 and the winding oblique line part 4 is 170 degrees, the length ratio of the oblique line part of the winding 2 to the winding straight line part 3 is 5:1, and the distance between the edge of the magnet 1 and the winding straight line part 3 is 0.5mm.
Magnet 1 comprises Fe-based nanocrystals and FeNi powder, wherein the Fe-based nanocrystals comprise 76.5wt% Fe, 9.5wt% Si, 2.5wt% Al, 8.0wt% B, 2.5wt% P, 1.5wt% Cu. The powder granularity of the Fe-based nanocrystalline is 5-25 um, and the surface of the Fe-based nanocrystalline powder is provided with an oxide layer of 20 nm.
The FeNi powder comprises 53wt% of Fe and 47wt% of Ni, wherein a silicon oxide coating layer is arranged on the surface of the FeNi powder, the thickness of the coating layer is 15nm, and the granularity of the FeNi powder is 0.7um.
The FeNi powder and silica sol accounting for 1.5wt% of the mass of the FeNi powder form agglomerated particles with the granularity of 10um, the agglomerated particles are graded with Fe-based nanocrystalline and a resin mixture to form mixed powder, the mass of the resin mixture is 1.5wt% of the mass of the mixed powder, and the mass of the Fe-based nanocrystalline accounts for 55wt% of the mass of the mixed powder.
The resin mixture consists of polyvinyl butyral resin and silicone resin, wherein the mass of the polyvinyl butyral accounts for 0.8wt% of the mass of the mixed powder, and the mass of the silicone resin accounts for 0.7wt% of the mass of the mixed powder.
The resin mixture was formed into an inductor blank with magnet 1 and winding 2 at a pressure of 2000MPa and annealed by a nitrogen atmosphere of 1.5H at 450 ℃ to form the final inductor.
In specific example 3:
A high resistivity inductor is composed of a magnet 1 and a winding 2, the winding 2 is distributed inside the magnet 1, the winding 2 extends outside the magnet 1 to form an electrode, and the length of the electrode is 0.85mm.
The winding 2 comprises a winding extension part 5, a winding oblique line part 4 and a winding straight line part 3, wherein an included angle between the winding extension part 5 and the winding oblique line part 4 is 30 degrees, the length ratio of the winding oblique line part 4 to the winding straight line part 3 is 3:1, and the distance between the edge of the magnet 1 and the winding straight line part 3 is 0.5mm.
The magnet 1 is composed of Fe-based nanocrystals, feSi powder and FeNi powder, wherein the Fe-based nanocrystals comprise 79.4wt% Fe, 8.5wt% Si, 2.0wt% Al, 7.1wt% B, 1.8wt% P, and 1.2wt% Cu. The powder granularity of the Fe-based nanocrystalline is 5-25 um, and the surface of the powder of the Fe-based nanocrystalline is provided with an oxide layer of 30 nm.
The FeSi powder comprises 94.5wt% of Fe and 5.5wt% of Si, the FeNi powder comprises 53wt% of Fe and 47wt% of Ni, and a silicon oxide coating layer is arranged on the surfaces of the FeSi powder and the FeNi powder, wherein the thickness of the coating layer is 18nm, the granularity of the FeSi powder and the FeNi powder is 1.7um, and the ratio of the FeSi powder to the FeNi powder is 3:7.
The FeSi powder and the FeNi powder and the silicon resin accounting for 1.2 weight percent of the total mass of the FeSi powder and the FeNi powder form agglomerated particles with the granularity of 15um, the agglomerated particles are graded with Fe-based nanocrystalline and a resin mixture to form mixed powder, the mass of the resin mixture accounts for 1.2 weight percent of the mass of the mixed powder, and the mass of the Fe-based nanocrystalline accounts for 35 weight percent of the mass of the mixed powder.
The resin mixture consisted of silicone resin, the mass of silicone resin was 0.5wt% of the mass of the mixed powder, and the mass of silicone resin was 0.7wt% of the mass of the mixed powder.
The resin mixture was formed into an inductor blank with magnet 1 and winding 2 at a pressure of 1800MPa and annealed by a nitrogen atmosphere of 1.0H at 520 ℃ to form the final inductor.
In comparative example 1:
A high resistivity inductor is composed of a magnet 1 and a winding 2, the winding 2 being distributed inside the magnet 1, while the winding 2 extends outside the magnet 1 to form an electrode with a length of 2mm.
The winding 2 comprises a winding extension 5, a winding oblique line 4 and a winding straight line 3, and the distance from the edge of the magnet 1 to the winding straight line 3 is 0.5mm.
The magnet 1 consists of Fe-based nanocrystalline and FeNi powder, wherein the components of the Fe-based nanocrystalline are 76.5wt% Fe, 9.5wt% Si, 2.5wt% Al, 8.0wt% B, 2.5wt% P and 1.5wt% Cu, the powder granularity of the Fe-based nanocrystalline is 5-25 um, and the surface of the powder of the Fe-based nanocrystalline is provided with an oxide layer of 20 nm.
The FeNi powder comprises 53wt% of Fe and 47wt% of Ni, a silicon oxide coating layer is arranged on the surface of the FeNi powder, the thickness of the coating layer is 15nm, the particle size of the FeNi powder is 0.7 mu m, the FeNi powder and silica sol accounting for 1.5wt% of the mass of the FeNi powder form agglomerated particles with the particle size of 10 mu m, the agglomerated particles are graded with Fe-based nano crystals and a resin mixture to form mixed powder, the mass of the resin mixture accounts for 1.5wt% of the mass of the mixed powder, and the mass of the Fe-based nano crystals accounts for 55wt% of the mass of the mixed powder.
The resin mixture consisted of a polyvinyl butyral resin, the mass of which was 0.8% by weight of the mass of the mixed powder, and a silicone resin, the mass of which was 0.7% by weight of the mass of the mixed powder.
The resin mixture was formed into an inductor blank with magnet 1 and winding 2 at a pressure of 2000MPa and annealed by a nitrogen atmosphere of 1.5H at 450 ℃ to form the final inductor.
In comparative example 2:
a high resistivity inductor is composed of a magnet 1 and a winding 2, the winding 2 being distributed inside the magnet 1, while the winding 2 extends outside the magnet 1 to form an electrode with a length of 0.3mm.
The winding 2 comprises a winding extension part 5, a winding oblique line part 4 and a winding straight line part 3, wherein an included angle between the winding extension part 5 and the winding oblique line part 4 is 110 degrees, the length ratio of the winding oblique line part 4 to the winding straight line part 3 is 1:1, and the distance between the edge of the magnet 1 and the winding straight line part 3 is 0.6mm.
The magnet 1 consists of Fe-based nanocrystalline and FeSiAl powder, wherein the Fe-based nanocrystalline comprises 82wt% of Fe, 7.0wt% of Si, 1.5wt% of Al, 6.0wt% of B, 1.5wt% of P and 0.5wt% of Cu, the powder granularity of the Fe-based nanocrystalline is 5-25 um, and the surface of the powder of the Fe-based nanocrystalline is provided with a 50nm oxide layer.
The Fe-based nanocrystalline and the resin mixture are graded to form mixed powder, the mass of the Fe-based nanocrystalline accounts for 99.3wt% of the mass of the mixed powder, the content of the resin mixture in the mixed powder is 0.7wt%, the resin mixture is a mixed resin containing polyvinyl butyral resin and organic silicon resin, the mass of the polyvinyl butyral accounts for 0.5wt% of the mass of the mixed powder, and the mass of the organic silicon resin accounts for 0.2wt% of the mass of the mixed powder.
The resin mixture was formed into an inductor blank with magnet 1 and winding 2 at a pressure of 1500MPa and annealed by a nitrogen atmosphere of 0.5H at 600 c to form the final inductor.
In comparative example 3:
a high resistivity inductor is composed of a magnet 1 and a winding 2, the winding 2 being distributed inside the magnet 1, while the winding 2 extends outside the magnet 1 to form an electrode with a length of 0.85mm.
The winding 2 comprises a winding extension part 5, a winding oblique line part 4 and a winding straight line part 3, wherein an included angle between the winding extension part 5 and the winding oblique line part 4 is 30 degrees, the length ratio of the winding oblique line part 4 to the winding straight line part 3 is 3:1, and the distance from the edge of the magnet 1 to the winding straight line part 3 is 0.5mm.
The magnet 1 is composed of FeSi powder and FeNi powder, wherein the FeSi powder comprises 94.5wt% of Fe and 5.5wt% of Si, the FeNi powder comprises 53wt% of Fe and 47wt% of Ni, a silicon oxide coating layer is arranged on the surfaces of the FeSi powder and the FeNi powder, the thickness of the coating layer is 18nm, the particle sizes of the FeSi powder and the FeNi powder are 5-25 um, the ratio of the FeSi powder to the FeNi powder is 3:7, the FeSi powder and the FeNi powder form agglomerated particles with the particle size of 15um with silicon resin accounting for 1.2wt% of the total mass of the FeSi powder and the FeNi powder, the agglomerated particles are mixed with the resin mixture to form mixed powder, and the mass of the resin mixture accounts for 1.2wt% of the mass of the mixed powder.
The resin mixture consisted of a silicone resin and a silicone resin, the mass of the silicone resin was 0.5wt% of the mass of the mixed powder, and the mass of the silicone resin was 0.7wt% of the mass of the mixed powder.
The resin mixture was formed into an inductor blank with magnet 1 and winding 2 at a pressure of 1800MPa and annealed by a nitrogen atmosphere of 1.0H at 520 ℃ to form the final inductor.
Performing performance evaluation on the heat-treated product, wherein the size of the product is 10.0mm long, 10.0mm wide and 6.0mm high, using an inductance value and saturation current of a 3260B type LCR tester (1V/800 kHz), and using an insulation resistance tester TH2683 to test insulation resistance between an electrode of an inductor and a magnet;
Examples and comparative examples performance comparisons:
comparison of the specific examples with the comparative examples gives: the saturation current and insulation resistance of the product produced under the same preparation conditions are obviously different from different materials and structures, which shows that the influence of composition control and structural design on the insulation resistance of the product and the saturation current of the product is very important.
The above embodiments are not intended to limit the scope of the present application, so: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.
Claims (1)
1. A high resistivity inductor, comprising:
The high-resistivity inductor consists of a magnet (1) and a winding (2), wherein the winding (2) is distributed inside the magnet (1), and the winding (2) extends out of the magnet (1) to form an electrode, and the length of the electrode is 2mm;
The winding (2) comprises a winding extension part (5), a winding oblique line part (4) and a winding straight line part (3), wherein an included angle between the winding extension part (5) and the winding oblique line part (4) is 170 degrees, the length ratio of the winding oblique line part (4) to the winding straight line part (3) is 5:1, and the distance between the edge of the magnet (1) and the winding straight line part (3) is 0.5mm;
The magnet (1) comprises Fe-based nanocrystalline and FeNi powder, wherein the Fe-based nanocrystalline comprises 76.5wt% of Fe, 9.5wt% of Si, 2.5wt% of Al, 8.0wt% of B, 2.5wt% of P and 1.5wt% of Cu, the powder granularity of the Fe-based nanocrystalline is 5-25 um, and the surface of the Fe-based nanocrystalline powder is provided with a 20nm oxide layer;
the FeNi powder comprises 53wt% of Fe and 47wt% of Ni, wherein a silicon oxide coating layer is arranged on the surface of the FeNi powder, the thickness of the coating layer is 15nm, and the granularity of the FeNi powder is 0.7um;
The FeNi powder and silica sol accounting for 1.5wt% of the mass of the FeNi powder form agglomerated particles with the granularity of 10um, the agglomerated particles are graded with the Fe-based nanocrystalline and a resin mixture to form mixed powder, the mass of the resin mixture is 1.5wt% of the mass of the mixed powder, and the mass of the Fe-based nanocrystalline accounts for 55wt% of the mass of the mixed powder;
The resin mixture consists of polyvinyl butyral resin and silicone resin, wherein the mass of the polyvinyl butyral accounts for 0.8wt% of the mass of the mixed powder, and the mass of the silicone resin accounts for 0.7wt% of the mass of the mixed powder;
The resin mixture forms an inductive green body with the magnet (1) and the winding (2) at a pressure of 2000MPa and is annealed by a nitrogen atmosphere of 1.5H at 450 ℃ to form the final high resistivity inductor.
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| CN214588372U (en) * | 2021-03-17 | 2021-11-02 | 麦格磁电科技（珠海）有限公司 | Iron core and inductor |
| CN116666064A (en) * | 2023-07-17 | 2023-08-29 | 惠州铂科新感科技有限公司 | Magnetic powder-winding cofiring type inductance element and preparation method thereof |
| JP2023124670A (en) * | 2022-02-25 | 2023-09-06 | Tdk株式会社 | Soft magnetic alloy powder, magnetic core, and magnetic component |
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| CN1697097A (en) * | 1995-06-19 | 2005-11-16 | 日本电装株式会社 | Electromagnetic coil |
| JP2000042694A (en) * | 1998-07-31 | 2000-02-15 | Seiko Epson Corp | Production of magnet material, magnet material and bond magnet |
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