WO2021031191A1 - Noyau de fer, dispositif électronique et appareil électronique - Google Patents

Noyau de fer, dispositif électronique et appareil électronique Download PDF

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Publication number
WO2021031191A1
WO2021031191A1 PCT/CN2019/102006 CN2019102006W WO2021031191A1 WO 2021031191 A1 WO2021031191 A1 WO 2021031191A1 CN 2019102006 W CN2019102006 W CN 2019102006W WO 2021031191 A1 WO2021031191 A1 WO 2021031191A1
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WO
WIPO (PCT)
Prior art keywords
iron core
soft magnetic
electronic device
magnetic material
cross
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Application number
PCT/CN2019/102006
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English (en)
Chinese (zh)
Inventor
邱健达
黄宏升
Original Assignee
深圳市大疆创新科技有限公司
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Application filed by 深圳市大疆创新科技有限公司 filed Critical 深圳市大疆创新科技有限公司
Priority to PCT/CN2019/102006 priority Critical patent/WO2021031191A1/fr
Priority to CN201980031815.7A priority patent/CN112119472A/zh
Publication of WO2021031191A1 publication Critical patent/WO2021031191A1/fr

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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
    • H01F3/06—Cores, Yokes, or armatures made from wires
    • 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
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • 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
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F2027/348—Preventing eddy currents

Definitions

  • This application relates to the field of magnet technology, and in particular to an iron core structure.
  • the iron core When the iron core is in use, its internal magnetic field will periodically change, thereby forming an eddy current inside the iron core.
  • the eddy current will cause energy loss and an increase in the temperature of the iron core, so the resistance of the iron core perpendicular to the direction of the magnetic flux is increased.
  • the reduction of eddy current is the industry’s basic requirement for iron cores, which is especially important for high frequency and high magnetic flux density applications.
  • the invention can effectively increase the resistance of the iron core perpendicular to the direction of the magnetic flux and reduce the eddy current loss while ensuring the maximum permeability of the magnetic flux direction of the iron core.
  • the first type is the laminated type and the winding type.
  • the basic composition is a soft magnetic material sheet, which is stacked or wound to form an iron core, and the magnetic flux direction is parallel to the plane of the sheet. It uses the insulating material coated on the surface of the sheet to form interlayer insulation, and confines the eddy current in the sheet to reduce the eddy current loss.
  • the second type is the particle bonding type, whose basic composition is soft magnetic material particles, which are bonded into a specific shape to form an iron core.
  • the surface of the particles is coated with an insulating material to form insulation between the particles, and the eddy current is restricted in the particles to reduce the eddy current loss.
  • the laminated core and the wound core are basically thin sheets, and the cross-section perpendicular to the magnetic flux is a rectangle with a large aspect ratio, and has not been divided into the smallest cross-sectional unit, so the eddy current loss is not the most excellent.
  • the basic composition of the particle-bonded iron core is particles.
  • the cross-section is divided into the smallest units in the direction perpendicular to the magnetic flux, there are also gaps between particles in the direction of the magnetic flux.
  • the gap increases the magnetic resistance of the iron core in the direction of the magnetic flux, and the magnetic permeability performance is not optimal.
  • the present application provides an iron core structure to solve the above technical problems.
  • the iron core When the iron core is in use, its internal magnetic field will periodically change, thereby forming an eddy current inside the iron core.
  • the eddy current will cause energy loss and an increase in the temperature of the iron core, so the resistance of the iron core perpendicular to the direction of the magnetic flux is increased.
  • the reduction of eddy current is the industry’s basic requirement for iron cores, which is especially important for high frequency and high magnetic flux density applications. This application can effectively increase the resistance of the iron core perpendicular to the direction of the magnetic flux while ensuring the maximum permeability of the magnetic flux direction of the iron core, and reduce the eddy current loss.
  • the first aspect of the present application provides an iron core, comprising: a soft magnetic material, the soft magnetic material is wire-shaped; an insulating layer; the insulating layer is located on the surface of the soft magnetic material; wherein, the soft magnetic material The materials are gathered parallel to each other to form a bundle.
  • the axial direction of the wire harness is parallel to the magnetic flux direction.
  • the iron core further includes an adhesive, and the soft magnetic material forms a wire harness by means of the adhesive.
  • the iron core is a columnar iron core or an annular iron core.
  • the iron core has any shape formed by scanning the same cross section along a curve.
  • cross-sectional shape of the thread-like soft magnetic material is a circle, a square, a rectangle or a regular hexagon.
  • cross section of the iron core is circular, trapezoidal, square, rectangular or regular hexagon.
  • cross-sectional shape of the soft magnetic material is the same as the cross-sectional shape of the iron core.
  • the diameter of the filament-shaped soft magnetic material is 0.005mm-0.5mm.
  • the insulating layer includes an organic insulating material or an inorganic insulating material.
  • the insulating layer and the adhesive are made of the same material, which simultaneously achieves insulation and adhesion.
  • a second aspect of the present application provides an electronic device, the electronic device includes an iron core, wherein the iron core includes: a soft magnetic material, the soft magnetic material is wire-shaped; an insulating layer; The surface of the soft magnetic material; wherein the soft magnetic materials are gathered parallel to each other to form a bundle.
  • the axial direction of the wire harness is parallel to the magnetic flux direction.
  • the iron core further includes an adhesive, and the soft magnetic material forms a wire harness by means of the adhesive.
  • the iron core is a columnar iron core or an annular iron core.
  • the iron core has any shape formed by scanning the same cross section along a curve.
  • cross-sectional shape of the thread-like soft magnetic material is a circle, a square, a rectangle or a regular hexagon.
  • cross section of the iron core is circular, trapezoidal, square, rectangular or regular hexagon.
  • cross-sectional shape of the soft magnetic material is the same as the cross-sectional shape of the iron core.
  • the diameter of the filament-shaped soft magnetic material is 0.005mm-0.5mm.
  • the insulating layer includes an organic insulating material or an inorganic insulating material.
  • the insulating layer and the adhesive are made of the same material, which simultaneously achieves insulation and adhesion.
  • the electronic device includes a motor, a transformer, a self-inductor or a mutual inductor.
  • a third aspect of the present application provides an electronic device, characterized in that the electronic device has the aforementioned electronic device.
  • the electronic device includes at least one of an unmanned aerial vehicle, a car, a remote control car, and a robot.
  • the iron core structure formed by the parallel gathering and bonding of the wire harness can optimize the eddy current loss and the magnetic permeability performance at the same time.
  • the wire harness is parallel to the direction of the magnetic flux, and the soft magnetic material is continuous in the direction of the magnetic flux to ensure that there is no gap This leads to a decrease in magnetic permeability.
  • the core structure divides the cross-section into the smallest units in the direction perpendicular to the magnetic flux, which can effectively increase the core perpendicular to the magnetic flux while ensuring the maximum permeability in the direction of the magnetic flux of the iron core.
  • the resistance in the direction reduces the eddy current loss.
  • the present application provides the aforementioned iron core, electronic device, and electronic device to provide an iron core structure formed by parallel aggregation and bonding of wire bundles that can simultaneously optimize eddy current loss and magnetic permeability.
  • the magnetic flux direction is parallel, and the soft magnetic material is continuous in the magnetic flux direction to ensure that the magnetic permeability performance will not be reduced due to the gap.
  • the iron core structure divides the cross-section into the smallest unit in the direction perpendicular to the magnetic flux, effectively reducing the current Eddy current loss.
  • Fig. 1 is a schematic diagram of a laminated core provided in the prior art
  • Fig. 2 is a schematic diagram of a wound core provided in the prior art
  • Fig. 3 is a schematic cross-sectional view of four kinds of filaments provided by an embodiment of the present application.
  • Fig. 4 is a schematic front view of four kinds of filaments provided by an embodiment of the present application.
  • Fig. 5 is a schematic cross-sectional microscopic view according to an embodiment of the present application.
  • FIG. 6 is a schematic diagram of a cylindrical iron core provided by an embodiment of the present application.
  • Fig. 7 is a schematic diagram of two ring-shaped iron cores provided by an embodiment of the present application.
  • the iron core products involved in this application include but are not limited to the following products: 1. Motor iron cores, especially iron cores of axial flux motors; 2. Transformer iron cores; 3. Self-inductors and mutual inductors.
  • the motor core is not only a good magnetic material, but also a kind of electrical conductor; when the alternating magnetic field lines pass through the electrical conductor, the electrical Induced electromotive force will be generated in the body, and under the action of induced electromotive force, a loop current will be generated in the conductor to heat the conductor; this phenomenon is caused by the alternating magnetic force lines passing through the conductor, and induced electromotive force and loop current are generated in the conductor People call it an eddy current, because the loop current it generates is not output as energy, but is lost in its own conductor.
  • the first type is the laminated type and the winding type.
  • the basic composition is a soft magnetic material sheet, which is stacked or wound to form an iron core, and the magnetic flux direction is parallel to the plane of the sheet. It uses the insulating material coated on the surface of the sheet to form interlayer insulation, and confines the eddy current in the sheet to reduce the eddy current loss.
  • the second type is the particle bonding type, whose basic composition is soft magnetic material particles, which are bonded into a specific shape to form an iron core.
  • the surface of the particles is coated with an insulating material to form insulation between the particles, and the eddy current is restricted in the particles to reduce the eddy current loss.
  • Figure 1 shows a schematic diagram of a laminated core provided in the prior art
  • Figure 2 shows A schematic diagram of a wound iron core provided in the prior art is shown
  • a laminated iron core is formed by laminating a plurality of iron chips, and each iron chip is fixed by riveting or adhesive, and the iron core 10
  • the core cores 11 are thin plates punched from a strip-shaped electromagnetic steel sheet with a die.
  • the annular central annular portion 12 is set in the center, and the plurality of teeth 13 are formed as the central annular portion 12 is the center and is arranged radially.
  • a magnetic pole portion 14 that is long in the circumferential direction is connected to each tooth portion 13.
  • the iron core 10 contributes to improving the magnetic characteristics of the iron core.
  • a wound core is formed by winding an iron core.
  • the core 20 is an iron core 21 wound with a predetermined number of turns. Therefore, the wound core 20 contributes to improving the magnetic properties of the core.
  • the basic composition of the laminated core and the wound core is thin slices.
  • the cross section perpendicular to the magnetic flux is a rectangle with a large aspect ratio, and it has not been divided into the smallest cross-sectional unit. The eddy current loss is still large, which cannot achieve better results.
  • the second type of particle-bonded iron core (not shown), its basic composition is particles. Although it has divided the cross section into the smallest unit in the direction perpendicular to the magnetic flux, it also exists in the direction of the magnetic flux. The gap between particles, which increases the magnetic resistance of the iron core in the direction of the magnetic flux, and the permeability performance is not optimal.
  • the iron core structure formed by the parallel aggregation and bonding of the wire harnesses of the present application can optimize the eddy current loss and the magnetic permeability performance at the same time, and make the wire harness parallel to the direction of the magnetic flux during use.
  • the iron core structure is continuous with soft magnetic materials in the direction of the magnetic flux, ensuring that the magnetic permeability performance will not be reduced due to the gap.
  • the iron core structure divides the cross section into the smallest unit in the direction perpendicular to the magnetic flux, effectively reducing the eddy current loss.
  • the present application provides an iron core comprising: a soft magnetic material, the soft magnetic material is in the shape of a wire; an insulating layer (Not shown); the insulating layer is located on the surface of the soft magnetic material; wherein the soft magnetic materials are gathered parallel to each other to form a wire bundle.
  • Figure 4 shows four types of wire harnesses.
  • the cross-sectional views of the four wire harnesses can be understood with reference to the cross-sectional shape shown in Figure 3.
  • the upper left shows a soft magnetic material with a hexagonal cross-section, and multiple wire-shaped
  • the soft magnetic materials are gathered in parallel to each other to form a bundle.
  • the gathered state is shown in the upper left corner of Fig. 4, and the upper right of Fig. 3 shows the soft magnetic material with a square cross section, and a plurality of thread-like soft magnetic materials are parallel to each other.
  • the state after gathering is shown in the wire harness in the upper right corner of Figure 4, and the bottom left of Figure 3 shows a soft magnetic material with a circular cross-section, and a plurality of thread-like soft magnetic materials are gathered in parallel to each other to form a wire harness
  • the assembled state is shown in the wire harness in the lower left corner of Fig. 4, and the lower right of Fig. 3 shows the soft magnetic material with a rectangular cross section, and a plurality of soft magnetic materials in the form of filaments are gathered parallel to each other to form a bunch of wires.
  • the axial direction of the wire harness is parallel to the magnetic flux direction.
  • the iron core further includes an adhesive
  • the soft magnetic material forms a wire harness with the adhesive.
  • each of the wire-shaped soft magnetic materials is formed into a wire bundle by an adhesive.
  • the iron core is a columnar iron core or an annular iron core.
  • Figure 6 shows an embodiment in which the iron core is cylindrical, in which the cross-section of the wire-shaped soft magnetic material is circular, and multiple soft material materials are parallel to each other to form a wire harness.
  • the cross-section of the entire wire harness is a regular hexagon. Ground, the shape of the cross-section of the soft magnetic material can also be selected as hexagonal, rectangular or square, and the cross-section of the entire wire harness can also be selected as other shapes, alternatively, round, rectangular or square.
  • This application is for soft materials or
  • the cross-sectional shape of the wire harness is not limited.
  • the extension direction of the wire harness is columnar extension, therefore, this kind of iron core structure is called a columnar iron core.
  • the iron core is annular.
  • the cross section of the thread-like soft magnetic material is circular, and multiple soft material materials are parallel to each other to form a wire bundle.
  • the cross section of the entire wire bundle is a regular hexagon.
  • the shape of the cross section of the soft magnetic material can also be selected as a hexagon.
  • Shape, rectangle or square, and the cross-section of the entire wire harness can also be selected as other shapes, alternatively, circular, rectangular or square, this application does not limit the cross-sectional shape of the soft material or the wire harness.
  • the extension direction of the wire harness is an annular extension, therefore, this kind of iron core structure is called an annular iron core.
  • the ring-shaped extension can constitute the entire ring or part of the ring. As shown in the upper figure of Fig. 7, it is a closed ring, and as shown in the lower figure of Fig. 7, it is an open ring.
  • the iron core has any shape formed by scanning the same cross section along a curve.
  • the iron core can also be obtained by scanning in a linear direction, such as the iron core shown in FIG. 6, which is a shape formed by scanning a regular hexagonal wire harness in a linear direction
  • the iron core shown in FIG. 7 is a regular six A shape formed by scanning the polygonal wire harness along the direction of a curve, and in the embodiment shown in FIG. 7, the curve is a circular curve or a part of a circular curve.
  • FIG. 5 exemplarily shows a wire harness structure, in which the cross section of the wire-shaped soft magnetic material 1 is circular, the cross section of the wire harness is trapezoidal, and the insulating material coating layer 2 coats the surface of the soft magnetic material ,
  • the adhesive 3 bonds a plurality of soft magnetic materials to form a wire harness structure.
  • the cross-sectional shape of the thread-like soft magnetic material is a circle, a square, a rectangle or a regular hexagon.
  • the cross section of the iron core is circular, trapezoidal, square, rectangular or regular hexagon.
  • the cross-sectional shape of the soft magnetic material is the same as the cross-sectional shape of the iron core.
  • the diameter of the thread-shaped soft magnetic material is 0.005mm-0.5mm.
  • the insulating layer includes an organic insulating material or an inorganic insulating material.
  • the insulating layer is located on the surface of the soft material material and insulates a plurality of soft magnetic materials.
  • the insulating layer and the adhesive are made of the same material, which simultaneously achieves insulation and adhesion.
  • the above-mentioned iron core can be applied to a motor, a transformer, a self-inductor, or a mutual inductor.
  • an electronic device may also be provided, the electronic device having the aforementioned electronic device.
  • the above-mentioned iron core may be applied to at least one of unmanned aerial vehicles, automobiles, remote control vehicles, and robots.
  • the iron core structure formed by the parallel gathering and bonding of the wire harness can optimize the eddy current loss and the magnetic permeability performance at the same time.
  • the wire harness is parallel to the direction of the magnetic flux, and the soft magnetic material is continuous in the direction of the magnetic flux to ensure that there is no gap This leads to a decrease in magnetic permeability.
  • the core structure divides the cross-section into the smallest units in the direction perpendicular to the magnetic flux, which can effectively increase the core perpendicular to the magnetic flux while ensuring the maximum permeability in the direction of the magnetic flux of the iron core.
  • the resistance in the direction reduces the eddy current loss.
  • an iron core structure which is formed by parallel gathering and bonding of soft magnetic material wire bundles, the axial direction of the wire bundle is parallel to the magnetic flux direction in use, and an insulating layer exists between the wire bundles to reduce the iron core eddy current loss.
  • the aforementioned iron core structure can be exemplarily manufactured by the following method:
  • the thin wire is made of soft magnetic materials such as pure iron, silicon steel, and low carbon steel.
  • the diameter of the wire is between 0.05 and 0.5mm; for example, the cross-sectional shape of the wire is round, square, or rectangular. Or regular hexagon.
  • the insulating material is an inorganic insulating material.
  • the filaments are grouped together in parallel, and the filaments are bonded to each other with the aid of an adhesive to form a columnar core.
  • the diameter of the filament may be a value other than 0.05 to 0.5 mm.
  • the cross-sectional shape of the filament may be a circle, a square, a rectangle, or other shapes other than a regular hexagon.
  • the insulating material on the surface of the filament may be an organic insulating material.
  • the insulating material and the adhesive may be the same substance, that is, there is one material, which can play the role of insulation and bonding at the same time.
  • the shape of the iron core can be any shape formed by scanning the same cross section along a curve in addition to a columnar shape and a ring shape.
  • an iron core comprising: a soft magnetic material, the soft magnetic material is in the shape of a wire; an insulating layer; the insulating layer is located on the surface of the soft magnetic material; wherein the soft magnetic materials are gathered in parallel to form a wire bundle .
  • the iron core structure manufactured based on the above structure or method optimizes the comprehensive performance of the iron core internal resistance and magnetic permeability.
  • the iron core structure is continuous with soft magnetic materials in the direction of the magnetic flux, ensuring that the magnetic permeability performance will not be reduced due to the gap.
  • the iron core structure divides the cross section into the smallest unit in the direction perpendicular to the magnetic flux, effectively reducing the eddy current loss.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Soft Magnetic Materials (AREA)

Abstract

La présente invention concerne un noyau de fer, comprenant : des matériaux magnétiques doux, qui sont en forme de fil ; et une couche isolante, située sur la surface des matériaux magnétiques doux, les matériaux magnétiques doux étant parallèles les uns aux autres et assemblés pour former un faisceau de câbles. La performance globale de la résistance interne et de la perméabilité magnétique du noyau de fer est optimisée ; les matériaux magnétiques doux de la structure de noyau de fer sont continus le long d'une direction de flux magnétique de telle sorte qu'il soit garanti que la performance de perméabilité magnétique peut ne pas être réduite en raison d'un espace ; de plus, la section transversale de la structure de noyau de fer est divisée en unités minimales dans une direction perpendiculaire au flux magnétique de telle sorte que la perte de courant de Foucault soit efficacement réduite.
PCT/CN2019/102006 2019-08-22 2019-08-22 Noyau de fer, dispositif électronique et appareil électronique WO2021031191A1 (fr)

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PCT/CN2019/102006 WO2021031191A1 (fr) 2019-08-22 2019-08-22 Noyau de fer, dispositif électronique et appareil électronique
CN201980031815.7A CN112119472A (zh) 2019-08-22 2019-08-22 铁芯、电子器件及电子装置

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PCT/CN2019/102006 WO2021031191A1 (fr) 2019-08-22 2019-08-22 Noyau de fer, dispositif électronique et appareil électronique

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CN113328549A (zh) * 2021-06-08 2021-08-31 清华大学 具有导磁线的铁心、磁路部件、轴向磁场电机和磁阻电机

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CN204668098U (zh) * 2015-05-15 2015-09-23 汪颖 一种低电磁性噪音的干式卷绕铁芯电抗器
DE102016119650A1 (de) * 2016-10-14 2018-04-19 Hochschule Aalen Verfahren zur Herstellung eines weichmagnetischen Kernmaterials
JP2018148119A (ja) * 2017-03-08 2018-09-20 株式会社神戸製鋼所 イグニッションコイル用鉄心及びイグニッションコイル用鉄心の製造方法
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CN204668098U (zh) * 2015-05-15 2015-09-23 汪颖 一种低电磁性噪音的干式卷绕铁芯电抗器
DE102016119650A1 (de) * 2016-10-14 2018-04-19 Hochschule Aalen Verfahren zur Herstellung eines weichmagnetischen Kernmaterials
JP2018148119A (ja) * 2017-03-08 2018-09-20 株式会社神戸製鋼所 イグニッションコイル用鉄心及びイグニッションコイル用鉄心の製造方法
CN109102998A (zh) * 2018-07-26 2018-12-28 江门市汇鼎科技有限公司 一种软磁片及其制备方法和用途

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