EP1564764A2 - Powder composite magnetic core and method of manufacturing the same - Google Patents

Powder composite magnetic core and method of manufacturing the same Download PDF

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Publication number
EP1564764A2
EP1564764A2 EP20040460055 EP04460055A EP1564764A2 EP 1564764 A2 EP1564764 A2 EP 1564764A2 EP 20040460055 EP20040460055 EP 20040460055 EP 04460055 A EP04460055 A EP 04460055A EP 1564764 A2 EP1564764 A2 EP 1564764A2
Authority
EP
European Patent Office
Prior art keywords
powder
magnetic material
filled
hard
magnetic
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Withdrawn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
EP20040460055
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German (de)
French (fr)
Inventor
Bogumil Weglinski
Artur Buniowski
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.)
Politechnika Wroclawska
Original Assignee
Politechnika Wroclawska
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 Politechnika Wroclawska filed Critical Politechnika Wroclawska
Publication of EP1564764A2 publication Critical patent/EP1564764A2/en
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/0206—Manufacturing of magnetic cores by mechanical means
    • H01F41/0246—Manufacturing of magnetic circuits by moulding or by pressing powder
    • 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
    • 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

Definitions

  • the invention concerns method for manufacturing powder composite magnetic core and powder composite magnetic core designed for manufacture of magnetic circuits used in electrotechnical appliances, and especially those employed in electrical machines.
  • Inductive element and method for producing the same are already known from international patent application WO02/101763.
  • Said powder composite is produced by mixing a ferromagnetic amorphous or nanocrystalline alloy powder with a ferromagnetic dielectric powder and a thermoplastic or duroplastic polymer, with dielectric ferromagnetic powder alloy equaling more than 55% by volume.
  • Inductive element produced of dielectric ferromagnetic powder is characteristic in that in the mixture of powders, ribbons of ferromagnetic alloy are placed in the mixture of powders.
  • magnetic cores or powder composite magnetic cores which are manufactured as components from homogenous mass of compressed powder, wherein the compacted magnetic cores are thermally or chemically treated.
  • Method for manufacturing comprises the die being filled with first with soft magnetic powder, then with hard magnetic powder, wherein the filling sequence is repeated alternatingly at least once with soft magnetic powder and at least with hard magnetic powder, with the poured powder being bounded through compacting.
  • the hard magnetic powder is mixed with insulating and bounding dielectric.
  • the die is being simultaneously filled with soft and hard magnetic powders along its walls.
  • powder composite magnetic core comprises at least two spaces, with at least one space is filled with soft magnetic material and at least one with hard magnetic material.
  • At least one space should be filled with hard magnetic material placed within the space filled with soft magnetic powder.
  • At least one space is filled with soft magnetic material and at least one is filled with hard magnetic material. These spaces are located along lateral sides of the magnetic core.
  • At least one layer of hard magnetic material is located along lateral sides of soft magnetic material, or at least one layer of hard magnetic material is located perpendicular to lateral sides of a component made of soft magnetic material.
  • Powder composite magnetic cores manufactured by the use of this innovative method are characterized by very good magnetic properties.
  • the innovative method allows for manufacture of magnetic core configurations of any number of soft magnetic and hard magnetic layers.
  • Main advantage of this innovative method is the possibility of manufacture of a dielectromagnetic-dielectromagnet type hybrid magnetic core through the use of powders exhibiting the desired properties in the filling process. Hybrid is formed during the process of filling the die with a proper powder. In case of cores or their more developed configurations, dielectromagnetic powder is used as layer which separates hard magnetic powder layers.
  • FIG. 1 illustrates powder composite magnetic core with one layer of soft magnetic material and one layer of hard magnetic material
  • Fig. 2 powder composite magnetic core with three spaces of soft magnetic material and two spaces of hard magnetic material
  • Fig. 3 sectional view of powder composite magnetic core with one layer of hard magnetic material located along lateral sides of a component made of soft magnetic material
  • Fig. 4 powder composite magnetic core with two spaces of hard magnetic material located along lateral sides of a component made of soft magnetic material
  • Fig. 5 demagnetization characteristics in function of magnetic field intensity, and Fig. 6 - maximal value of energy density for respective powder composite magnetic cores.
  • Method for manufacturing powder composite magnetic core comprises the die being filled with soft magnetic powder and then with hard magnetic powder. Layers of powders are bonded through the process of compacting, wherein hard magnetic powder is mixed with insulating and bonding dielectric before it is poured into the die.
  • Method for manufacturing powder composite magnetic core proceeds in the same way as in example 1, the difference being that the sequence of form filling is repeated three times with soft magnetic powder and twice with hard magnetic powder.
  • Method for manufacturing powder composite magnetic core proceeds in the same way as in example 1, the difference being that soft magnetic powder and hard magnetic powder are poured into the die simultaneously.
  • Powder composite magnetic core manufactured as component made of compacted powder, has two spaces 1, 2, wherein one space is filled with soft magnetic powder 1, and second space is filled with hard magnetic material 2.
  • Powder composite magnetic core is manufactured as in example 4, the difference being that it is manufactured as a layered magnetic core and has two spaces filled with hard magnetic powder 2 located between three layers of filled with soft magnetic material 1.
  • Powder composite magnetic core is manufactured as in example 4, the difference being that it is manufactured as a cylinder, whose soft magnetic material space 1 is located within hard magnetic material space 2.
  • Powder composite magnetic core is manufactured as in example 6, the difference being that it is manufactured as a cubicoid.
  • Powder composite magnetic core is manufactured as in example 4, the difference being that it is manufactured as a cubicoid, wherein soft magnetic material-filled spaces 1 are located alternately with hard magnetic material-filled spaces along the lateral sides of rectangular prism.
  • Magnetic properties of new powder composite magnetic cores are illustrated with diagrams, first of which presents the dependence of magnetic field intensity H in function of demagnetization jB, and the second - maximum values of energy density BH max for selected types of A, B, C and D magnetic cores.
  • Magnetic cores A and B are manufactured as layered magnetic cores and each has one hard magnetic material-filled layer 2 located between two spaces filled with soft magnetic material 1. Magnetic cores A and B differ as far as the thickness of spaces is concerned. Magnetic core C is manufactured as a layered magnetic core, as in example 2. Magnetic core D is also manufactured as a layered magnetic core, the difference being that it has three spaces filled with hard magnetic material 2 located between four soft magnetic material-filled spaces 1.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Soft Magnetic Materials (AREA)
  • Hard Magnetic Materials (AREA)

Abstract

Method for manufacturing powder magnetic core comprises the die being filled with first with soft magnetic powder, and then with hard magnetic powder, wherein the filling sequence is repeated altematingly, at least once with soft magnetic powder and at least with hard magnetic powder, with the poured powder being bounded through compacting.
Powder composite magnetic core manufactured as spatial element characteristic in that it has at least two spaces (1, 2) existing, with at least one space filled with soft magnetic material (1) and least one space being filled with hard magnetic material (2).

Description

  • The invention concerns method for manufacturing powder composite magnetic core and powder composite magnetic core designed for manufacture of magnetic circuits used in electrotechnical appliances, and especially those employed in electrical machines.
  • Inductive element and method for producing the same are already known from international patent application WO02/101763. Said powder composite is produced by mixing a ferromagnetic amorphous or nanocrystalline alloy powder with a ferromagnetic dielectric powder and a thermoplastic or duroplastic polymer, with dielectric ferromagnetic powder alloy equaling more than 55% by volume. Inductive element produced of dielectric ferromagnetic powder is characteristic in that in the mixture of powders, ribbons of ferromagnetic alloy are placed in the mixture of powders.
  • Known from their employment are magnetic cores or powder composite magnetic cores, which are manufactured as components from homogenous mass of compressed powder, wherein the compacted magnetic cores are thermally or chemically treated.
  • Method for manufacturing, according to the invention comprises the die being filled with first with soft magnetic powder, then with hard magnetic powder, wherein the filling sequence is repeated alternatingly at least once with soft magnetic powder and at least with hard magnetic powder, with the poured powder being bounded through compacting.
  • Favourably, the hard magnetic powder is mixed with insulating and bounding dielectric.
  • What is favourable is also that the die is being simultaneously filled with soft and hard magnetic powders along its walls.
  • According to the invention, the idea of powder composite magnetic core comprises at least two spaces, with at least one space is filled with soft magnetic material and at least one with hard magnetic material.
  • Favourably, at least one space should be filled with hard magnetic material placed within the space filled with soft magnetic powder.
  • What is also favourable is that at least one space is filled with soft magnetic material and at least one is filled with hard magnetic material. These spaces are located along lateral sides of the magnetic core.
  • Favourably, at least one layer of hard magnetic material is located along lateral sides of soft magnetic material, or at least one layer of hard magnetic material is located perpendicular to lateral sides of a component made of soft magnetic material.
  • Powder composite magnetic cores manufactured by the use of this innovative method are characterized by very good magnetic properties. The innovative method allows for manufacture of magnetic core configurations of any number of soft magnetic and hard magnetic layers. Main advantage of this innovative method is the possibility of manufacture of a dielectromagnetic-dielectromagnet type hybrid magnetic core through the use of powders exhibiting the desired properties in the filling process. Hybrid is formed during the process of filling the die with a proper powder. In case of cores or their more developed configurations, dielectromagnetic powder is used as layer which separates hard magnetic powder layers.
  • Embodiment of the invention w is presented in the drawing in which Fig. 1 illustrates powder composite magnetic core with one layer of soft magnetic material and one layer of hard magnetic material; Fig. 2 - powder composite magnetic core with three spaces of soft magnetic material and two spaces of hard magnetic material; Fig. 3 - sectional view of powder composite magnetic core with one layer of hard magnetic material located along lateral sides of a component made of soft magnetic material; Fig. 4 - powder composite magnetic core with two spaces of hard magnetic material located along lateral sides of a component made of soft magnetic material; Fig. 5 - demagnetization characteristics in function of magnetic field intensity, and Fig. 6 - maximal value of energy density for respective powder composite magnetic cores.
    • Example 1.
  • Method for manufacturing powder composite magnetic core comprises the die being filled with soft magnetic powder and then with hard magnetic powder. Layers of powders are bonded through the process of compacting, wherein hard magnetic powder is mixed with insulating and bonding dielectric before it is poured into the die.
    • Example 2.
  • Method for manufacturing powder composite magnetic core proceeds in the same way as in example 1, the difference being that the sequence of form filling is repeated three times with soft magnetic powder and twice with hard magnetic powder.
    • Example 3.
  • Method for manufacturing powder composite magnetic core proceeds in the same way as in example 1, the difference being that soft magnetic powder and hard magnetic powder are poured into the die simultaneously.
    • Example 4.
  • Powder composite magnetic core, manufactured as component made of compacted powder, has two spaces 1, 2, wherein one space is filled with soft magnetic powder 1, and second space is filled with hard magnetic material 2.
    • Example 5.
  • Powder composite magnetic core is manufactured as in example 4, the difference being that it is manufactured as a layered magnetic core and has two spaces filled with hard magnetic powder 2 located between three layers of filled with soft magnetic material 1.
    • Example 6.
  • Powder composite magnetic core is manufactured as in example 4, the difference being that it is manufactured as a cylinder, whose soft magnetic material space 1 is located within hard magnetic material space 2.
    • Example 7.
  • Powder composite magnetic core is manufactured as in example 6, the difference being that it is manufactured as a cubicoid.
    • Example 8.
  • Powder composite magnetic core is manufactured as in example 4, the difference being that it is manufactured as a cubicoid, wherein soft magnetic material-filled spaces 1 are located alternately with hard magnetic material-filled spaces along the lateral sides of rectangular prism.
  • Magnetic properties of new powder composite magnetic cores are illustrated with diagrams, first of which presents the dependence of magnetic field intensity H in function of demagnetization jB, and the second - maximum values of energy density BHmax for selected types of A, B, C and D magnetic cores.
  • It is clearly visible that maximum value of energy density for A, B, C and D magnetic cores depends on the thickness and the number of layers of the tested A, B, C and D magnetic cores. Magnetic cores A and B are manufactured as layered magnetic cores and each has one hard magnetic material-filled layer 2 located between two spaces filled with soft magnetic material 1. Magnetic cores A and B differ as far as the thickness of spaces is concerned. Magnetic core C is manufactured as a layered magnetic core, as in example 2. Magnetic core D is also manufactured as a layered magnetic core, the difference being that it has three spaces filled with hard magnetic material 2 located between four soft magnetic material-filled spaces 1.

Claims (8)

  1. Method for manufacturing powder composite magnetic cores, wherein powders are bounded first by their compression and then by their sintering or curing, wherein the form is being filled with soft magnetic material and then with hard magnetic material, with the pouring sequence of the die is repeated alternatingly, at least once with soft magnetic material and at least once with hard magnetic material, with subsequent bounding of the powder through compacting.
  2. Method as claimed in Claim 1, wherein the hard magnetic powder is mixed with insulating and bonding dielectric.
  3. Method as claimed in Claim 1, wherein the die is being filled with hard magnetic material along its walls.
  4. Method as claimed in Claim 1, wherein the die is being filled with soft magnetic material along its walls.
  5. Method as claimed in Claim 1, wherein the die is simultaneously being filled with soft magnetic material and hard magnetic material along its walls.
  6. Powder composite magnetic core manufactured as spatial element of compacted powder of any shape, wherein at least two spaces (1, 2) exist, with at least one space is filled with soft magnetic material (1) and at least one space is filled with hard magnetic material (2)
  7. Powder composite magnetic core as claimed in Claim 5, wherein at least one space is filled with hard magnetic material (2) is located (3).
  8. Powder composite magnetic core as claimed in Claim 7, wherein at least one space is filled with soft magnetic material (1) and at least one space is filled with hard magnetic material (2) are located along lateral sides of the magnetic core.
EP20040460055 2003-12-24 2004-12-23 Powder composite magnetic core and method of manufacturing the same Withdrawn EP1564764A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PL364235A PL202422B1 (en) 2003-12-24 2003-12-24 Method for manufacture of the magnetic core from powder composites and the magnetic core made of powder composites
PL36423503 2003-12-24

Publications (1)

Publication Number Publication Date
EP1564764A2 true EP1564764A2 (en) 2005-08-17

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EP20040460055 Withdrawn EP1564764A2 (en) 2003-12-24 2004-12-23 Powder composite magnetic core and method of manufacturing the same

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EP (1) EP1564764A2 (en)
PL (1) PL202422B1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006017844A1 (en) * 2006-04-18 2007-10-25 Siemens Ag Permanent magnet producing method for e.g. electrical motor`s rotor, involves inserting magnetic raw material into coating material forming cap that serves as protection unit at rotor in mounted condition, and forming magnet in cap
CN101572143B (en) * 2009-03-11 2011-04-06 南京信息工程大学 Compound permanent magnetic powder and method for preparing same
DE102012222224A1 (en) * 2012-12-04 2014-06-05 SUMIDA Components & Modules GmbH Magnetic cores and process for their preparation
US8974608B2 (en) * 2007-04-17 2015-03-10 Fuji Electric Co., Ltd. Powder magnetic core and the method of manufacturing the same

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006017844A1 (en) * 2006-04-18 2007-10-25 Siemens Ag Permanent magnet producing method for e.g. electrical motor`s rotor, involves inserting magnetic raw material into coating material forming cap that serves as protection unit at rotor in mounted condition, and forming magnet in cap
DE102006017844B4 (en) * 2006-04-18 2013-02-21 Siemens Aktiengesellschaft Method for producing a permanent magnet for an electrodynamic machine
US8974608B2 (en) * 2007-04-17 2015-03-10 Fuji Electric Co., Ltd. Powder magnetic core and the method of manufacturing the same
CN101572143B (en) * 2009-03-11 2011-04-06 南京信息工程大学 Compound permanent magnetic powder and method for preparing same
DE102012222224A1 (en) * 2012-12-04 2014-06-05 SUMIDA Components & Modules GmbH Magnetic cores and process for their preparation
DE102012222224B4 (en) * 2012-12-04 2016-02-18 SUMIDA Components & Modules GmbH Magnetic core and multi-part core arrangement
US9831033B2 (en) 2012-12-04 2017-11-28 Sumida Components And Modules Gmbh Method for producing magnetic cores

Also Published As

Publication number Publication date
PL364235A1 (en) 2005-06-27
PL202422B1 (en) 2009-06-30

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