EP3373311B1 - Skelett für magnetkern und verfahren zu seiner herstellung - Google Patents

Skelett für magnetkern und verfahren zu seiner herstellung Download PDF

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Publication number
EP3373311B1
EP3373311B1 EP18000128.1A EP18000128A EP3373311B1 EP 3373311 B1 EP3373311 B1 EP 3373311B1 EP 18000128 A EP18000128 A EP 18000128A EP 3373311 B1 EP3373311 B1 EP 3373311B1
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EP
European Patent Office
Prior art keywords
core
rods
cross
skeleton
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.)
Active
Application number
EP18000128.1A
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German (de)
English (en)
French (fr)
Other versions
EP3373311A1 (de
Inventor
Michal Kubík
Daniel Koutný
David Palousek
Ondrej Machácek
Zbynek Stecker
Ivan MAZUREK
Jakub ROUPEC
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.)
Vysoke Uceni Technicke V Brne
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Vysoke Uceni Technicke V Brne
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Publication of EP3373311A1 publication Critical patent/EP3373311A1/de
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/04—Cores, Yokes, or armatures made from strips or ribbons
    • 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
    • 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
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/08—Cores, Yokes, or armatures made from powder

Definitions

  • the invention relates to ferromagnetic cores intended for devices based on the electromagnetic principle, and it also relates to a manufacturing method for their structure.
  • the magnetic induction flux passes at least partially through a core made of ferromagnetic material (pure iron, silicon steel, soft structural steel, FeNi alloys, FeCo alloys, etc.). These materials are characterized by good magnetic properties, i.e. high permeability, high magnetic saturation and low remanence, and good mechanical properties.
  • ferromagnetic material pure iron, silicon steel, soft structural steel, FeNi alloys, FeCo alloys, etc.
  • These materials are characterized by good magnetic properties, i.e. high permeability, high magnetic saturation and low remanence, and good mechanical properties.
  • a disadvantage of these materials is their considerable electrical conductance, which allows the formation of eddy currents in the core of devices that work with a pulsating magnetic field.
  • 1 and 2 represent typical examples of the distribution of magnetic induction and the vector of current density in a simple magnetic circuit, a toroidal core. It is noticeable that the magnetic induction vector is directed perpendicularly to the XZ section plane, while the current density vector lies in this plane. The eddy currents always flow in the plane perpendicular to the magnetic lines of force, in all directions.
  • the cores are made of ferromagnetic sheets or strips with a dielectric layer, s US9251939 or US2016/0336100 . But that only helps partially, since such a structure throttles the eddy currents in only one direction.
  • the magnetic core after the US2011/095642 is formed by wrapping a foil of a ferromagnetic material, after wrapping a laminate consisting of several layers of the foil always leaving a gap intended for filling with casting resin. After wrapping such a laminate tube, eight elements are made of one on its circumference Insulating material attached to which another laminate tube is wrapped.
  • the GB162731 refers to a device for controlling the starting current in rotating machines by means of eddy currents generated in a core.
  • the core passing through a coil is formed by elongated ferromagnetic elements - ribbons, rods or tubes, separated by air gaps. These elements are made of common materials, the permeability of which is chosen according to the intended use. These elongated elements are separated at both ends by insulation and clamped between ferromagnetic plates that connect the parallel sections of the core.
  • EP2975618 describes a core consisting of rods formed by stacks of laminated sheet metal strips. The packs lie on top of each other in rows, leaving a gap between some adjacent packs to form a cooling channel.
  • the invention is based on the object of providing a magnet core and a method for its manufacture, the structure of the core significantly limiting the formation of eddy currents while retaining good mechanical properties and saving material.
  • this object is achieved by a method having the features of claim 1 and by a skeleton for a magnetic core having the features of claim 8 .
  • Preferred embodiments of the method are defined in the dependent claims.
  • the number of rods and their distribution in a cross section of the core are advantageously proportional to the intensity of the magnetic flux determined in the model in the given cross section of the core.
  • the total cross-sectional area of the rods in each cross-section of the core is proportional to the intensity of the magnetic flux determined in the model in the given cross-section of the core.
  • the transverse area and shape of the cross section of the rod change along the rod depending on the current intensity of the magnetic flux determined in the model.
  • the structure of the skeleton is advantageously supplemented with ferromagnetic material having a cellular structure in order to increase its strength.
  • the ferromagnetic skeleton can be flooded with casting resin, which then solidifies, or filled with a magnetically conductive dielectric.
  • the skeleton for a magnetic core consists of bars of ferromagnetic material, which in each core section take the direction of the lines of force of the predefined magnetic flux of the model, being formed by a bundle of bars separated by layers of air, directed at a distance from each other, with the neighboring ones Rods are connected by spaced fixed bridges of the same ferromagnetic material.
  • the essence of the invention is illustrated below using an example of a simple toroidal magnetic core Figures 3 to 6 illustrated.
  • the ferromagnetic structure of the core is formed by a bundle of rods 1, eg of FeNi alloy, which are spaced apart so that between each pair of adjacent rods 1 there remains a layer of air or a gap filled with a dielectric. It is evident that the rods are 1 in take the direction of the lines of force of the magnetic field at every intersection of the core. Adjacent bars 1 are connected by fixed bridges 2 of the same material, placed at regular intervals.
  • Another embodiment of the invention is 7 shown.
  • the solid bridges 2 maintaining the spacing of the individual rods 1 are there formed outside the outer mantle of the core, and after filling the gaps in the skeleton with a solid dielectric, they can be broken off. This ensures complete mutual electrical insulation of the individual rods.
  • the manufacturing method of the core skeleton described below makes it possible to manufacture the skeleton in such a way that the sum of the cross-sectional areas of individual rods 1 in a cross-section of the core corresponds to the intensity of the magnetic flux in this cross-section.
  • the transverse area or the shape of the cross-section of the rod 1 can vary along the rod 1 depending on the intensity of the magnetic flux at the given location.
  • the measures mentioned are aimed at saving ferromagnetic material in the core and thereby reducing its weight.
  • they have the consequence that, e.g. in the case of a cylindrical core, the density of the rods and thus the mechanical strength in the direction of the circumference are reduced.
  • a cellular structure laminate structure
  • This structure gives the core high strength without significantly increasing the weight.
  • the structure documented for the simple toroidal core can be used with cores of any shape, whether represented by a closed magnetic circuit or occupying only part of the circuit.
  • the described nuclear skeleton is manufactured in such a way that the shape of the bundle of rods, the distribution of rods in the bundle, and the cross-sectional shape of individual rods are determined using a numerical method, eg FEM, and After that, the bundle of rods is produced using additive technology in a 3D printer, e.g. SLM.
  • a numerical method eg FEM
  • SLM additive technology
  • the direction of the magnetic induction in the stationary state can be taken from a model - a massive core provided with an induction coil using the numerical method FEM.
  • FEM numerical method
  • the lines of magnetic force are concentric circles. Their exact form can be determined using Maxwell's equations.
  • Production on a 3D printer using the SLM or SLS method consists of applying a thin layer of powder, which is subsequently melted or sintered with a laser beam. Another layer is then applied and melted again so that the individual layers bond. Proceed in this way until the whole part is finished.
  • auxiliary supports overhanging parts can also be produced.
  • the auxiliary supports are finally demolished.
  • a structure can also be built without supports.
  • the core skeleton can be fabricated from a variety of current-carrying ferromagnetic materials such as pure iron, silicon steel, mild steel, magnetic stainless steel, FeCoV alloys such as Hiperco, FeNi alloys, FeCo alloys, and the like.
  • the core's ferromagnetic construction can be overmolded in a mold with a dielectric potting resin, or the gaps can be filled with a sandy magnetically conductive dielectric which improves the cumulative magnetic properties of the core. In this way, a fully compact core is created.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Soft Magnetic Materials (AREA)
  • Electromagnets (AREA)
  • Linear Motors (AREA)
EP18000128.1A 2017-02-17 2018-02-12 Skelett für magnetkern und verfahren zu seiner herstellung Active EP3373311B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CZ2017-91A CZ307249B6 (cs) 2017-02-17 2017-02-17 Skelet jádra tvořeného pruty z feromagnetického materiálu

Publications (2)

Publication Number Publication Date
EP3373311A1 EP3373311A1 (de) 2018-09-12
EP3373311B1 true EP3373311B1 (de) 2022-09-28

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP18000128.1A Active EP3373311B1 (de) 2017-02-17 2018-02-12 Skelett für magnetkern und verfahren zu seiner herstellung

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EP (1) EP3373311B1 (cs)
CZ (1) CZ307249B6 (cs)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3102316B1 (fr) * 2019-10-16 2021-09-24 Commissariat Energie Atomique pièce monobloc et ferromagnétique d’une machine électrique tournante
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
CN114048705B (zh) * 2021-11-24 2024-05-28 大连理工大学 一种螺管式电磁阀的优化设计方法
DE102024106870A1 (de) * 2024-03-11 2025-09-11 Rolls-Royce Deutschland Ltd & Co Kg Magnetkern für eine elektrische Maschine

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB162731A (en) * 1920-01-03 1921-05-03 British Thomson Houston Co Ltd Improvements in and relating to electro-magnetic devices for controlling alternating current dynamo electric machines
DE2505080C3 (de) * 1975-02-07 1989-04-06 Hartmann, Götz-Udo, 6391 Grävenwiesbach Funkentstördrossel und Verfahren zu ihrer Herstellung
GB2105522A (en) * 1981-09-05 1983-03-23 Gen Motors Ltd Laminated core structure
US5530251A (en) * 1994-12-21 1996-06-25 International Business Machines Corporation Inductively coupled dual-stage magnetic deflection yoke
JP2000067667A (ja) * 1998-08-25 2000-03-03 Kobe Steel Ltd Ｎｂ３ Ａｌ系超電導線材の前駆体と、Ｎｂ３ Ａｌ系超電導線材およびその製造方法
US6348275B1 (en) * 1998-11-06 2002-02-19 Honeywell International Inc. Bulk amorphous metal magnetic component
DE102006017762B4 (de) * 2006-04-12 2010-07-08 Siemens Ag Verfahren zum Laminieren eines Elektrobandes für Transformatorenkerne
JP5442388B2 (ja) * 2009-10-22 2014-03-12 株式会社日立産機システム 磁性鉄心およびその製造方法、アキシャルギャップ型回転電機、静止機
US10022789B2 (en) * 2011-06-30 2018-07-17 Persimmon Technologies Corporation System and method for making a structured magnetic material with integrated particle insulation
DE102013112325B4 (de) * 2013-11-08 2024-02-08 Sma Solar Technology Ag Ringspule und Herstellungsverfahren für eine Ringspule
EP2975618B1 (de) * 2014-07-16 2019-05-29 Siemens Aktiengesellschaft Kern für eine elektrische Induktionseinrichtung

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CZ201791A3 (cs) 2018-04-25
CZ307249B6 (cs) 2018-04-25
EP3373311A1 (de) 2018-09-12

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