EP4000766A1 - Verfahren zur herstellung eines permanentmagneten unter verwendung einer magnetmaterialform - Google Patents

Verfahren zur herstellung eines permanentmagneten unter verwendung einer magnetmaterialform Download PDF

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Publication number
EP4000766A1
EP4000766A1 EP20209447.0A EP20209447A EP4000766A1 EP 4000766 A1 EP4000766 A1 EP 4000766A1 EP 20209447 A EP20209447 A EP 20209447A EP 4000766 A1 EP4000766 A1 EP 4000766A1
Authority
EP
European Patent Office
Prior art keywords
magnetic
mold
cavity
magnet
set forth
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP20209447.0A
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English (en)
French (fr)
Inventor
Ziad Azar
Richard Clark
Zhanjiang Hu
Hans-joergen Thougaard
Adriana Cristina Urda
Dong Yi
Maohua ZHANG
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens Gamesa Renewable Energy AS
Original Assignee
Siemens Gamesa Renewable Energy AS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens Gamesa Renewable Energy AS filed Critical Siemens Gamesa Renewable Energy AS
Priority to EP20209447.0A priority Critical patent/EP4000766A1/de
Priority to PCT/EP2021/075617 priority patent/WO2022111876A1/en
Priority to CN202180079104.4A priority patent/CN116490938A/zh
Publication of EP4000766A1 publication Critical patent/EP4000766A1/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/12—Both compacting and sintering
    • B22F3/1208—Containers or coating used therefor
    • 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
    • H01F1/032—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 hard-magnetic materials
    • H01F1/04—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 hard-magnetic materials metals or alloys
    • H01F1/047—Alloys characterised by their composition
    • H01F1/053—Alloys characterised by their composition containing rare earth metals
    • H01F1/055—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
    • H01F1/057—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
    • H01F1/0571—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes
    • H01F1/0575—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together
    • H01F1/0577—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together sintered
    • 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
    • H01F41/0253—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 for manufacturing permanent magnets
    • H01F41/0273—Imparting anisotropy
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
    • B22F2998/10—Processes characterised by the sequence of their steps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C2202/00—Physical properties
    • C22C2202/02—Magnetic
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy
    • C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
    • C22C33/0278—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5%

Definitions

  • the present invention relates to a method of manufacturing a permanent magnet, in particular a focused magnetic flux magnet. Further, the present invention relates to a method of manufacturing an electromechanical transducer, in particular a generator for a wind turbine. The present invention further relates to a mold and a use of the mold to manufacture a focused magnetic flux magnet.
  • the present invention hence relates to the technical field of manufacturing permanent magnets for electromechanical transducers.
  • Permanent magnetic materials are used in a plurality of different fields of application. Probably the technically and economically most important field of applications are electromechanical transducers, i.e. electric motors and electric generators.
  • An electric motor being equipped with at least one permanent magnet converts electric energy into mechanical energy by producing a temporary varying magnetic field by means of windings or coils. This temporary varying magnetic field interacts with the magnetic field of the PM resulting e.g. in a rotational movement of a rotor arrangement with respect to a stator arrangement of the electric motor.
  • an electric generator converts mechanical energy into electric energy.
  • An electric generator is a core component of any power plant for generating electric energy. This holds true for power plants which directly capture mechanical energy, e.g. hydroelectric power installations, tidal power installations, and wind power installations also denominated wind turbines. However, this also holds true for power plants which i) first use chemical energy e.g. from burning fossil fuel or from nuclear energy in order to generate thermal energy, and which ii) second convert the generated thermal energy into mechanical energy by means of appropriate thermodynamic processes.
  • the efficiency of an electric generator is probably the most important factor for optimizing the production of electric energy.
  • a permanent magnet electric generator it is essential that the magnetic flux produced by the permanent magnets is strong, i.e. there is a high level/magnitude of magnetic flux density.
  • sintered rare earth magnets e.g. using a NdFeB (Nd 2 Fe 14 B) material composition.
  • the spatial magnetic field distribution produced by permanent magnets has an impact on the generator efficiency.
  • the performance of torque/power production is determined by an airgap between stator arrangement and rotor arrangement flux density which is produced by the permanent magnets. It has been found that said airgap flux density, and accordingly the torque/power, can be increased, and thereby improved, by utilizing permanent magnets with improved magnetic alignment properties, in particular focused magnetic flux magnets.
  • the airgap flux density can be increased by using a higher magnet grade, however there is a physical limitation.
  • the magnet can be made thicker, however, this leads to increased magnet volume and hence higher manufacturing costs. Said option also has a physical limitation because, as the magnet thickness is increased, disadvantages with respect to magnetic saturation may occur.
  • EP 2762838 A1 describes an apparatus and methods for manufacturing magnets having magnetically oriented grains.
  • the field of a permanent magnet is shaped by applying an external field to the material from which the magnet is made in such a way as to magnetize different regions of the material in different directions.
  • the apparatus may include a metal-powder press that may press metal powder in the presence of a magnetic field. The press may compress the powder in an axial direction.
  • the field may have magnetic flux lines that are transverse to the axial direction.
  • the field may have magnetic flux lines that are along the axial direction.
  • Figure 4 shows an example of manufacturing a focused magnetic flux permanent magnet according to the prior art: a magnetic powder 430 comprising a plurality of magnetic particles is placed into a cavity 410 of a mold 400.
  • the mold 400 is arranged between two magnetic poles 440, wherein the magnetic poles are excited by alignment coils, which provide a magnetic flux 450.
  • the region 425 outside the cavity 410 are conventionally made of non-magnetic material with a very low relative magnetic permeability, which is close to the relative magnetic permeability of air, in particular around 1.0 ⁇ r .
  • Said non-magnetic material is selected for the required mechanical properties, wherein typically non-magnetic stainless steel is applied.
  • the magnetic poles 440 establish the magnetic flux 450 that crosses the cavity 410 to achieve the required alignment of the particles of the magnetic powder 430 inside the cavity 410.
  • Figure 5 shows the magnetic flux lines, in other words, the predicted equipotential magnetic field plots, in and around the cavity 410 and also of the magnetic powder 430.
  • the cavity 410 is surrounded by a non-magnetic material 425 with a relative magnetic permeability of around 1.0 ⁇ r such as non-magnetic stainless steel.
  • Figure 5 shows a zoom to a corner of the cavity 410 of Figure 4 . It can be clearly seen that the magnetic flux lines are distorted and deviate from the desired distribution. Specifically, a change in the declination of the magnetic flux lines can be seen, where the magnetic flux lines cross the boundary between the cavity 410 and the non-magnetic material 425 around the cavity 410.
  • a method of manufacturing a permanent magnet in particular a focused magnetic flux magnet
  • the method comprising: i) providing a mold, wherein the mold comprises a cavity, in particular having the shape of the magnet to be manufactured, and a mold region, in particular directly, around the cavity, e.g. surrounding the cavity, ii) establishing a magnetic flux, e.g. by using magnetic poles, with respect to the cavity, i.e. in the cavity and at least partially out of the cavity, iii) placing a magnetic powder, comprising a plurality of magnetic particles, e.g.
  • the magnetic particles of the magnetic powder are oriented, in particular aligned in the magnet flux to provide an angular distribution of magnetization directions, and iv) forming the permanent magnet from the magnetic powder particles, e.g. by pressing/sintering the magnetic powder particles, with the oriented angular distribution of magnetization directions.
  • the mold region comprises a magnetic material, for example a ferromagnetic material like iron, or magnetic stainless steel, with a relative magnetic permeability that is higher than air, in particular 1.01 ⁇ r or higher, more in particular higher than 1.05 ⁇ r , more in particular in the range 1.01 to 10 ⁇ r , more in particular 1.01 to 5 ⁇ r , more in particular 1.03 to 5 ⁇ r .
  • a magnetic material for example a ferromagnetic material like iron, or magnetic stainless steel, with a relative magnetic permeability that is higher than air, in particular 1.01 ⁇ r or higher, more in particular higher than 1.05 ⁇ r , more in particular in the range 1.01 to 10 ⁇ r , more in particular 1.01 to 5 ⁇ r , more in particular 1.03 to 5 ⁇ r .
  • an electromechanical transducer in particular a generator of a wind turbine, more in particular a direct drive wind turbine, the method comprising: i) providing a stator arrangement, and ii) providing a rotor arrangement using a permanent magnet, in particular a focused magnetic flux magnet manufactured as described above.
  • a mold for manufacturing a permanent magnet in particular a focused magnetic flux magnet
  • the mold comprises: i) a cavity for receiving a magnetic powder, and ii) a mold region around the cavity, wherein the mold region comprises a material with a relative magnetic permeability ⁇ r that is higher than air, i.e. 1.01 ⁇ r or higher, in particular higher than 1.05 ⁇ r , more in particular in the range 1.01 to 10 ⁇ r , more in particular 1.01 to 5 ⁇ r .
  • the term "mold", or mould, cast(ing) mold may in particular refer to any element that comprises a cavity within a mold region, and which element is suitable to form a magnet within said cavity.
  • the mold may have any shape or size that is suitable to manufacture the desired magnet. Since magnets are often manufactured by pressing magnetic powder, the mold may be configured to perform/support a powder pressing step.
  • the mold may compromise a pressing arm, e.g. a piston, that presses, e.g. punches, the powder inside the cavity, while the magnetic particles are aligned in the magnet field.
  • the mold may comprise sidewalls around the cavity. Further, the mold may comprise a pressing part.
  • the whole region around the cavity may be made of the magnetic material, or only a part of the mold region may comprise the magnetic material.
  • the magnetic powder may be, at least partially, pressed to a compact structure, in particular at least compact enough to not fall apart, wherein the pressing may be sufficient to retain the alignment.
  • This compact structure may be taken out of the mold in a further step and may then be further pressed and sintered outside the mold.
  • the magnetic permeability is the measure of the resistance of a material against the formation of a magnetic field. Hence, it is the degree of magnetization that a material obtains in response to an applied magnetic field.
  • the relative magnetic permeability of air is around 1.0 ⁇ r , while the relative magnetic permeability of, in particular pure, iron is much higher, depending on the grade of purity.
  • the magnetic permeability of NdFeB is for example around 1.03 ⁇ r .
  • the invention is based on the idea that a method of manufacturing a permanent magnet, in particular a focused magnetic flux magnet, with an improved orientation, in particular alignment, of angular distribution of magnetization directions, can be provided, when the permanent magnet is manufactured using a mold, wherein a mold region around a cavity is made of a magnetic material with a relative magnetic permeability being higher than the relative permeability of air, i.e. 1.01 ⁇ r or higher, in particular 1.03 ⁇ r or higher.
  • the described manufacturing method may be applicable to many different permanent magnet shapes, e.g. rectangular, segmented magnets or one-piece magnets, which are manufactured from particles that are aligned, e.g. using magnetic poles, in a magnetic field.
  • permanent magnet shapes e.g. rectangular, segmented magnets or one-piece magnets, which are manufactured from particles that are aligned, e.g. using magnetic poles, in a magnetic field.
  • the permanent magnet is a focused magnetic flux magnet with an angular, in particular spatial, distribution of magnetization directions resulting in a focused magnetization.
  • an electromechanical transducer with especially advantageous power/torque performance can be provided.
  • Using a mold material that has a relative magnetic permeability > 1.0 ⁇ r may allow the required magnetic field to be established in the cavity with a lower level of excitation.
  • Varying the thickness and/or width and/or shape gives the magnet designer a further degree of freedom for realizing a desired magnetic flux density profile, in particular within in the air gap between the rotor arrangement and the stator arrangement.
  • the mold region comprises a ferromagnetic material. This may provide the advantage that an established material with defined magnetic properties can be directly applied. For example, the same material or a material with similar magnetic properties as for the magnetic powder particles may be used.
  • the magnetic material of the mold region comprises a magnetic property that is, in particular essentially, equal and/or similar to a magnetic property of the magnetic powder.
  • the magnetic material of the mold region comprises a magnetic property that is not less than 0.5 times and not more than 1.5 times in comparison to the magnetic property of the magnetic powder.
  • the magnetic saturation of the mold region may be the magnetic saturation of the magnetic powder, in particular ⁇ 0.2 T.
  • the magnetic property comprises the magnetic permeability and/or the magnetic saturation.
  • Magnetic saturation may be the state reached when an increase in applied external magnetic field cannot increase the magnetization of a material further. Magnetic saturation may be a characteristic of ferromagnetic materials and their alloys.
  • the mold region comprises at least one of the group which consists of: the sidewalls, the bottom, the top of the mold.
  • the sidewalls and/or the bottom/top may be very thick in order to enlarge the advantage of using the mold region magnetic material.
  • At least one diameter of the cavity may be the same or smaller than at least one thickness of the mold region.
  • the cavity may further comprise a cover and/or top, and the cover may also be made of the mold region magnetic material.
  • the top and/or the bottom may comprise a piston for pressing the magnetic powder in the mold cavity.
  • forming comprises: pressing the magnetic powder. This may provide the advantage that known and established magnet formation methods can be directly applied, while the magnetic alignment of the obtained magnet is highly improved.
  • the magnetic flux is established by magnetic poles which comprise a ferromagnetic material and/or alignment coils. Also in this case, known and established magnet formation methods can be directly applied, while the magnetic alignment of the obtained magnet is highly improved.
  • the magnetic poles are not limited in their shape, e.g. circular as shown in the Figures. Instead, multiple magnetic pole shapes may be realized, for example rectangular, flat, or circular with different radii, or elliptical.
  • the method further comprises: forming the focused magnetic flux magnet by one magnet piece.
  • the method further comprises: forming the focused magnetic flux magnet by at least two magnet pieces being attached to each other.
  • single piece may particularly mean that the respective magnet is integrally or monolithically formed by means of a single bulk magnetic material.
  • Using a sintered magnet material, in particular with a rare earth material composition, may provide the advantage that a strong magnetic flux density in particular within the various focal regions can be realized.
  • an angular distribution of magnetization directions as described above is based on or is directly related with a preferred direction of particle, e.g. grain, orientations. This means that it is not necessary that all particles, contributing to a particular magnetic domain alignment direction or magnetization line, have to be oriented exactly in the same direction. It is rather only necessary that among a certain distribution of particle orientations there is, in particular in average, a preferred particle orientation.
  • the magnetic powder comprises NdFeB, which is a highly effective magnetic material.
  • the, in particular focused, magnetization directions of the angular distribution comprise, in particular essentially ideal, straight lines.
  • Having focusing magnetization directions along flux lines may provide the advantage that the process of manufacturing the magnet, e.g. during a sintering procedure, may be facilitated. This holds true in particular in view of the matter of fact that an external magnetic field having a corresponding and necessary inhomogeneity can be generated comparatively easy with a proper spatial arrangement of external magnet coils/poles.
  • the magnetic focusing of the respective focused magnetic flux magnet may not be perfect.
  • the distribution of magnetization directions may result, at least in a cross-sectional view, in a focal volume having a certain spatial extension.
  • the magnetic focal region may be, at least in a cross-sectional view, a magnetic focal point.
  • the described focusing may be i) a two dimensional (2D) focusing or ii) a three dimensional (3D) focusing.
  • the wind turbine is a direct drive wind turbine.
  • a generator comprises a stator arrangement and a rotor arrangement.
  • the generator is realized in a so called “inner stator - outer rotor" configuration, wherein the rotor arrangement surrounds the stator arrangement. This means that permanent magnets are moved around an arrangement of a plurality of coils of the inner stator arrangement which coils produce an induced current resulting from picking up a time varying magnetic flux from the moving permanent magnets.
  • spatially relative terms such as “front” and “back”, “above” and “below”, “left” and “right”, et cetera are used to describe an element's relationship to another element(s) as illustrated in the figures.
  • the spatially relative terms may apply to orientations in use which differ from the orientation depicted in the figures.
  • All such spatially relative terms refer to the orientation shown in the figures only for ease of description and are not necessarily limiting as an apparatus according to an embodiment of the invention can assume orientations different than those illustrated in the figures when in use.
  • a magnetic material is used outside the cavity of the mold.
  • This magnetic material should have a permeability higher than the air and there are not particular upper limits for this permeability, depending on the specific mold design and dimensions.
  • the magnetic saturation and/or the relative magnetic permeability of this material is preferentially similar to that of the magnetic powder, but there are also no specific limits for the magnetic saturation of this materials.
  • Figure 1 shows a mold 100 for manufacturing a permanent magnet, wherein the mold 100 comprises a cavity 110 for receiving a magnetic powder 130 that comprises magnetic particles.
  • the mold 100 further comprises a mold region 120 arranged around the cavity 110, wherein the mold region 120 comprises the sidewalls and the bottom of the cavity 110.
  • the mold region 120 is very thick in comparison to the size of the cavity 110.
  • the mold region 120 comprises a material with a relative magnetic permeability that is larger than the relative magnetic permeability of air, larger than the relative magnetic permeability of non-magnetic stainless steel, and larger than 1.01 ⁇ r .
  • the non-magnetic material of the prior art is replaced with a magnetic material having magnetic properties (essentially) similar to the magnetic powder 130 within the cavity.
  • the magnetic powder 130 When performing the described manufacturing method, the magnetic powder 130 is placed into a cavity 110 of the mold 100.
  • the magnetic flux 150 is established using, e.g. at least two, magnetic poles 140 arranged with respect to the cavity 110.
  • the magnetic particles of the magnetic powder 130 are then oriented in the magnet flux 150 to provide an angular distribution of magnetization directions.
  • the permanent magnet is formed from the magnetic powder 130 with oriented angular distribution of magnetization directions by pressing the particles within the cavity 110. In case that a focused magnetic flux magnet is formed, the angular distribution of magnetization directions is focused.
  • Figure 2 shows the magnetic flux lines 150 during the manufacturing process.
  • the cavity 110 is surrounded by a mold region 120 magnetic material with a relative magnetic permeability of more than 1.01 ⁇ r , in particular similar to that of the magnetic powder 130.
  • a relative magnetic permeability of more than 1.01 ⁇ r in particular similar to that of the magnetic powder 130.
  • Figure 3 shows a zoom to a corner of the cavity 110 of Figure 2 , i.e. an interface between the cavity 110 and the mold region 120. It can be clearly seen that the magnetic flux lines 150 are not distorted and do not deviate from the desired distribution. No change in the declination of the magnetic flux lines 150 can be seen, where the magnetic flux lines 150 cross the interface between cavity 110 and mold region 120.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)
  • Powder Metallurgy (AREA)
EP20209447.0A 2020-11-24 2020-11-24 Verfahren zur herstellung eines permanentmagneten unter verwendung einer magnetmaterialform Withdrawn EP4000766A1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP20209447.0A EP4000766A1 (de) 2020-11-24 2020-11-24 Verfahren zur herstellung eines permanentmagneten unter verwendung einer magnetmaterialform
PCT/EP2021/075617 WO2022111876A1 (en) 2020-11-24 2021-09-17 Method of manufacturing a permanent magnet using a magnetic material mold
CN202180079104.4A CN116490938A (zh) 2020-11-24 2021-09-17 使用磁性材料模具制造永磁体的方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20209447.0A EP4000766A1 (de) 2020-11-24 2020-11-24 Verfahren zur herstellung eines permanentmagneten unter verwendung einer magnetmaterialform

Publications (1)

Publication Number Publication Date
EP4000766A1 true EP4000766A1 (de) 2022-05-25

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EP20209447.0A Withdrawn EP4000766A1 (de) 2020-11-24 2020-11-24 Verfahren zur herstellung eines permanentmagneten unter verwendung einer magnetmaterialform

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EP (1) EP4000766A1 (de)
CN (1) CN116490938A (de)
WO (1) WO2022111876A1 (de)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004105062A1 (ja) * 2003-05-20 2004-12-02 Aichi Steel Corporation ボンド磁石の製造方法
EP2762838A2 (de) 2013-01-30 2014-08-06 Arnold Magnetic Technologies AG Magneten mit umrissenem Feld
DE102014202848A1 (de) * 2014-02-17 2015-08-20 Robert Bosch Gmbh Spritzwerkzeug zur Herstellung eines Permanentmagneten
WO2019219986A2 (en) * 2019-03-11 2019-11-21 Siemens Gamesa Renewable Energy A/S Magnet assembly comprising magnet devices each having a focusing magnetic domain alignment pattern
WO2019238981A2 (en) * 2019-08-20 2019-12-19 Siemens Gamesa Renewable Energy A/S Mould and method for manufacturing flux focusing permanent magnets comprising spread magnetic flux lines

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004105062A1 (ja) * 2003-05-20 2004-12-02 Aichi Steel Corporation ボンド磁石の製造方法
EP2762838A2 (de) 2013-01-30 2014-08-06 Arnold Magnetic Technologies AG Magneten mit umrissenem Feld
DE102014202848A1 (de) * 2014-02-17 2015-08-20 Robert Bosch Gmbh Spritzwerkzeug zur Herstellung eines Permanentmagneten
WO2019219986A2 (en) * 2019-03-11 2019-11-21 Siemens Gamesa Renewable Energy A/S Magnet assembly comprising magnet devices each having a focusing magnetic domain alignment pattern
WO2019238981A2 (en) * 2019-08-20 2019-12-19 Siemens Gamesa Renewable Energy A/S Mould and method for manufacturing flux focusing permanent magnets comprising spread magnetic flux lines

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WO2022111876A1 (en) 2022-06-02
CN116490938A (zh) 2023-07-25

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