EP1513169B1 - Vorrichtung zur vielpoligen Magnetisierung und Verfahren zur Herstellung einer solchen Vorrichtung - Google Patents

Vorrichtung zur vielpoligen Magnetisierung und Verfahren zur Herstellung einer solchen Vorrichtung Download PDF

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Publication number
EP1513169B1
EP1513169B1 EP04468015.5A EP04468015A EP1513169B1 EP 1513169 B1 EP1513169 B1 EP 1513169B1 EP 04468015 A EP04468015 A EP 04468015A EP 1513169 B1 EP1513169 B1 EP 1513169B1
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EP
European Patent Office
Prior art keywords
thorn
magnetizing
cuttings
cooling
head
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.)
Expired - Lifetime
Application number
EP04468015.5A
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English (en)
French (fr)
Other versions
EP1513169A2 (de
EP1513169A3 (de
Inventor
Anton Hamler
Albin Sirc
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.)
Iskra Mehanizmi Industrija Mehanizmov Aparatov In Sistemov DD
Original Assignee
Iskra Mehanizmi Industrija Mehanizmov Aparatov In Sistemov DD
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Application filed by Iskra Mehanizmi Industrija Mehanizmov Aparatov In Sistemov DD filed Critical Iskra Mehanizmi Industrija Mehanizmov Aparatov In Sistemov DD
Priority to SI200432340A priority Critical patent/SI1513169T1/sl
Publication of EP1513169A2 publication Critical patent/EP1513169A2/de
Publication of EP1513169A3 publication Critical patent/EP1513169A3/de
Application granted granted Critical
Publication of EP1513169B1 publication Critical patent/EP1513169B1/de
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F13/00—Apparatus or processes for magnetising or demagnetising
    • H01F13/003—Methods and devices for magnetising permanent magnets

Definitions

  • This invention relates in general to apparatus and processes for magnetizing and demagnetizing hard magnetic materials, and in particular to multipole magnetizing devices.
  • the present invention concerns a device for multipolar magnetization of hard magnetic materials, such as rare earths and ferrites, and a method for producing such magnetizing device.
  • hard magnetic materials such as rare earths and ferrites
  • the device should withstand high mechanical loadings produced by magnetic forces of the strong magnetic field.
  • the magnetizing device warms itself intensively as the magnetic field is generated by high current impulses. So, the design of the magnetizing device and the method for producing the said device should be such as to ensure that the geometrical form of the device would be precise and symmetric and that the heat released during the magnetization process would be conveyed away efficiently.
  • a multipolar magnetizing device for permanent magnets having a supporting structure, which can be either a solid block, or a series of superimposed sheets, made of electrically insulating material, which may be of fiberglass, with prepared apertures to receive the electrically conductive magnetizing winding.
  • the apertures are arranged to firmly support the winding to prevent displacement despite the strong magnetic fields generated by a high-current impulse discharge.
  • the winding can be arranged to produce a variety of polar patterns on flat magnets or, by providing a suitable opening in the supporting structure, on cylindrical magnets.
  • Highly coercive magnet materials are known to be magnetized primarily with high current pulses through a current conductor arranged to form a sequence of current loops around a round magnet, or a sequence of current loops along the flat magnet.
  • the required magnetic field is created by means of the said current loops, which are generally made of wire in prior art magnetizers.
  • the electrically conductive array may be formed from a continuous length of wire, or rod
  • the array may be conveniently formed from sections of wire, or rod, whose respective ends project through the supporting plate, the ends of adjacent sections being twisted together to provide a maximum surface area exposed to the air or other cooling fluid.
  • the twisted portions may be bonded, as by soldering, or brazing.
  • Magnetizing device for continuous magnets with a high current leader and a bobbin, in/in order/through that the high current leader is guided for pole production in a suitable way characterised in that bobbins are made from a composite material from a good heat-conductor and/or ferromagnetic powders and an electrical insulated bonding agent, whereby the volume fraction of the bonding agent is lower as 20%.
  • a magnetising device for multi-pole permanent magnets has high-current conductors which are constructed integrally and have lateral webs which project through a retaining plate such that they dissipate the heat produced in the current conductor.
  • the current conductors are produced from a copper strip by stamping out the intermediate spaces between the cooling webs.
  • the essential aspect of the magnetizing device according to the present invention is that it can magnetize highly coercive magnet materials, such as rare earths, which require a high value of magnetic field strength to reach the point of magnetic saturation.
  • the device is designed to concentrate the magnetic field on very thin sections enabling narrow magnetic pole pitches to be formed; consequently, a series of pole pairs can be arranged around a cylindrical magnet or along the surface of a flat magnet.
  • Another object of the invention is to provide a stable magnetizing process as well as small dissipation of widths and amplitudes of the magnetic fields of the pole pairs. This object is achieved by ensuring suitable accuracy of the geometric shape of the magnetizing head.
  • the frame structure of the multipole magnetizing device consists of a base 1, two supports, 2 and 3, affixed on the edges of the base 1, and a cooling plate 14, which is affixed to the supports 2 and 3 by means of fastening sockets 14a.
  • a support 4 for a thorn 5 is affixed, the thorn 5 being designed to accept the magnet, which should be magnetized.
  • a magnetizing head 6 is disposed in the center of a mechanical protecting block 7 in such a way, that its longitudinal axis coincides with the longitudinal axis of the thorn 5.
  • the block 7 with the integrated magnetizing head 6 is fastened onto the supports 2 and 3 in such a manner that it can be moved along the said supports.
  • the block 7 is made of nonconductive and nonmagnetizable material and has adequate mechanical strength to ensure proper support to the magnetizing head 6 in its radial direction, so that the magnetizing head can withstand high forces of strong magnetic field produced by high-current impulses.
  • a cooling thorn 15 is affixed, which has a cooling system built in such a way, that within the thorn 15 a tube 15b is inserted, which is to a small degree thinner than the cylindrical cavity of the thorn (15) and is cut obliquely on its lower end.
  • the cooling liquid flows downwards the tube 15b to the end of the cooling thorn 15, where the liquid is turned upwards to flow between the outer wall of the tube 15b and the wall of the cylindrical cavity of the thorn 15 towards the outlet conduit 16 in the cooling plate 14.
  • the multipole magnetizing head 6 is manufactured in the shape of a tubular body 8, made of a solid material, which must be a good electrical conductor.
  • vertical cuttings 9 and 11 are arranged in alternating succession, the said cuttings being cut across the entire width of the wall of the body 8, while in vertical direction their length is equal to approximately 8/9 of the height of the body 8, wherein the said cuttings 9 commence at the top of the body 8 and the said cuttings 11 commence at the bottom of the body 8.
  • a cutting 10 is made, which runs across the entire height of the body 8.
  • the sequence of cuttings 9, 10 and 11 forms a series of electrically conductive columns in the body 8.
  • the geometric shape of the columns creates a current loop that begins at cutting 10.
  • the shape of the columns that form the current loop ensures that during magnetizing process the main portion of the current is sufficiently close to the surface of the magnet material, which is evident from the figure 6 .
  • the width of the magnetic poles is defined by the arrangement of cuttings 9, 10, and 11 around the body 8, i.e. by the gaps between the said cuttings.
  • the best conditions can be achieved by lamellization of the body 8, as in this case at high current impulses with the order of magnitude of 80 kA the order of magnitude of the magnetic flux density on the surface of the magnetic material can be 2 T.
  • the cuttings 9, 10, and 11 on the body 8 of the magnetizing head 6 can be produced by means of wire erosion or immersing erosion process or by any other metal removal process. These processes can produce geometrically precise symmetric current conducting paths ensuring thereby the required symmetry of magnetic poles. In addition, focusing of the magnetic field in narrow portions of the magnetic material can be achieved. The symmetry of the magnetic poles is important also as it ensures compensation of strong transversal forces arising due to high current impulses in the magnetizing head 8. An efficient compensation of transversal forces prolongs the life span of the magnetizing device. Adequate mechanical strength of the magnetizing device is accomplished by the precise geometrical shape of the body 8 and the cuttings 9, 10, and 11, which provide the required symmetry of current conducting paths and thereby ensure a uniform distribution of forces against the supporting walls of the mechanical protecting block 7.
  • the openings of the cuttings 9, 10, and 11 separating the individual current paths are filled with synthetic resin re-enforced with glass fibers or Kevlar® fibers.
  • the removal of heat is carried out by means of the cooling thorn 15, which is made of material with good heat conducting properties and is also cooled by means of a cooling system integrated in the thorn, the said cooling system ensuring efficient removal of heat from the thorn 15.
  • the cooling thorn 15 releases the heat also into the cooling plate 14.
  • the thorn 15 is brought into physical contact with the columns of the body 8, i.e. with the current conducting paths, and can therefore accept the built-up heat energy even faster.
  • the cooling time is defined so that a working temperature around 100°C is maintained to ensure longer life span of the device and a stable magnetization process.
  • the body 8 is made of an insulated band, which is a good electrical conductor.
  • the said insulated band is formed in the shape of a block, while in a device for magnetizing cylindrical magnets the said band is rolled into a coil of a toroidal shape.
  • the body 8 is made of insulated concentric tubes, which are put together into a block in the case of a device for magnetizing flat magnets, while in the case of a device for magnetizing cylindrical magnets, the said insulated concentric tubes are rolled into a coil having a toroidal shape.
  • the current conducting paths have a rectangular section, when the body 8 is formed into a block, and a section in the form of a ring, when the body 8 has a cylindrical shape.
  • the order of magnitude of the magnetic field intensity can be as high as 2500 kA/m. Besides, such intensity can be generated on very narrow sections around a cylindrical magnet or along the surface in case of a flat magnet. Such high intensity is necessary for magnetizing rare earth magnetic materials as demonstrated in the figures 6 and 7 .

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)

Claims (7)

  1. Vorrichtung zur vielpoligen Magnetisierung zur Herstellung mehrpoligen Dauermagneten mit symmetrischen und abwechselnden Gegenpolen, wobei die Dauermagneten aus stark koerzitiven Materialien wie hartmagnetischen Ferriten und Materialien auf Basis von Seltenen Erden hergestellt werden, dadurch gekennzeichnet, dass
    - an den Kanten einer Basis (1) zwei Träger (2 und 3) befestigt sind,
    - in der Mitte der Basis ein Träger (4) für einen Stift (5) befestigt ist, wobei der Stift (5) ausgelegt ist, um den zu magnetisierenden Magneten zu empfangen;
    - ein Magnetisierungskopf (6) in der Mitte eines mechanischen Schutzblocks (7) derart angeordnet ist, dass die Längsachse des Magnetisierungskopfs (6) mit der Längsachse des Stifts (5) zusammenfällt;
    - die Träger (2 und 3) durch den Block (7) und durch die Befestigungsbuchsen (14a) einer Kühlplatte (14) derart durchtreten, dass die Kühlplatte (14) an den Träger (2 und 3) befestigt ist;
    - in der Mitte der eine Leitung (16) zum Ablauf von Kühlflüssigkeit umfassenden Kühlplatte (14) ein Kühlstift (15) zur Wärmeableitung befestigt ist, der ein Kühlsystem derart eingebettet hat, dass innerhalb des Stifts eine Röhre (15b) eingesetzt ist, die etwa dünner als der zylindrische Hohlraum des Stifts (5) ist und an seinem unteren Ende schräg geschnitten ist;
    - der Block (7) mit dem integrierten Magnetisierungskopf (6) an den Trägern (2 und 3) derart befestigt ist, dass er entlang der genannten Träger zwischen einer Position, in welcher der Magnetisierungskopf (6) den Stift (5) umgibt, und einer Position, in welcher der Magnetisierungskopf (6) den Kühlstift (15) umgibt, verschiebbar ist;
    - der Block (7) aus nicht leitendem und nicht magnetisierbaren Material ausgefertigt ist und eine ausreichende mechanische Festigkeit aufweist, um die richtige Unterstützung des Magnetisierungskopfs (6) in seiner Radialrichtung zu gewährleisten.
  2. Vorrichtung nach Anspruch 1, wobei der vielpolige Magnetisierungskopf (6) in Form eines, aus einem festen Material hergestellten röhrenförmigen Körpers (8) vorliegt, der ein guter elektrischer Leiter sein muss; dass im Körper (8) senkrechte, über die gesamte Breite der Wand des Körpers (8) geschnittene, in Wechselfolge hintereinanderliegende Schlitze (9 und 11) angeordnet sind, während ihre Länge in senkrechter Richtung gleich etwa 8/9 der Höhe des Körpers (8) ist, wobei die genannten Schlitze (9) an der Oberseite des Körpers (8) und die genannten Schlitze (11) an der Bodenseite des Körpers beginnen; dass zwischen dem ersten Schlitz und dem letzten Schlitz (9), an welchen die Anschlüsse (12 und 13) angeschlossen werden, ein Schlitz (10) anstatt des Schlitzes (11) ausgeführt ist, der sich über die gesamte Höhe des Körpers (8) erstreckt.
  3. Vorrichtung nach Anspruch 1, wobei der vielpolige Magnetisierungskopf (6) die Form eines röhrenförmigen Körpers (8) aufweist und aus einem elektrisch leitenden, isolierten Band ausgefertigt ist, das zu einer Spule in Toroidform aufgerollt ist.
  4. Vorrichtung nach Anspruch 1, wobei der vielpolige Magnetisierungskopf (6) die Form eines röhrenförmigen Körpers (8) aufweist und aus isolierten konzentrischen Röhren ausgefertigt ist.
  5. Vorrichtung nach Anspruch 2, wobei die Schlitze im röhrenförmigen Körper (8) des vielpoligen Magnetisierungskopfs (6) mit dem Drahterodierungs- oder Senkerodierungsverfahren ausgefertigt werden und wobei die Öffnungen der Schlitze mit Kunstharz, das mit Glasfasern oder Kevlar®-Fasern verstärkt ist, gefüllt sind.
  6. Vorrichtung nach Anspruch 2, wobei die Schlitze im röhrenförmigen Körper (8) des vielpoligen Magnetisierungskopfs (6) mit dem Metallabtragungsverfahren ausgefertigt werden und wobei die Öffnungen der Schlitze mit Kunstharz, das mit Glasfasern oder Kevlar®-Fasern verstärkt ist, gefüllt sind.
  7. Vorrichtung nach Anspruch 1, wobei während des Magnetisierungsvorgangs und insbesondere nach Abschluss des Magnetisierungsvorgangs die Kühlflüssigkeit durch das Kühlsystem der Vorrichtung hindurchgeleitet wird, zuerst nach unten durch die im Kühlstift (15) angeordnete Röhre (15b), dann nach oben zwischen der Außenwand der Röhre (15b) und der Wand des zylindrischen Hohlraums des Stifts (15) gegen die in der Kühlplatte (14) angeordneten Auslassleitung (16), und schließlich durch die Ablaufleitung (16).
EP04468015.5A 2003-09-05 2004-09-03 Vorrichtung zur vielpoligen Magnetisierung und Verfahren zur Herstellung einer solchen Vorrichtung Expired - Lifetime EP1513169B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SI200432340A SI1513169T1 (sl) 2003-09-05 2004-09-03 Mnogopolna magnetilna naprava in postopek izdelave

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SI200300220 2003-09-05
SI200300220A SI21630A (sl) 2003-09-05 2003-09-05 Mnogopolna magnetilna naprava in postopek izdelave

Publications (3)

Publication Number Publication Date
EP1513169A2 EP1513169A2 (de) 2005-03-09
EP1513169A3 EP1513169A3 (de) 2009-12-23
EP1513169B1 true EP1513169B1 (de) 2016-06-08

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EP04468015.5A Expired - Lifetime EP1513169B1 (de) 2003-09-05 2004-09-03 Vorrichtung zur vielpoligen Magnetisierung und Verfahren zur Herstellung einer solchen Vorrichtung

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102789875B (zh) * 2012-09-11 2014-01-22 成都图南电子有限公司 适用于高度较高磁体的辐射充磁装置
ES3024132T3 (en) * 2019-05-03 2025-06-03 Pomoca S A Multipolar magnetising fixture for high coercivity materials
CN111376388B (zh) * 2019-10-28 2021-08-20 横店集团东磁股份有限公司 一种提高永磁铁氧体二极径向磁环磁性能的成型模具
CN111354531A (zh) * 2020-05-13 2020-06-30 宣城立创自动化科技有限公司 一种智能磁瓦充磁装置及其应用方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH184107A (de) * 1934-07-11 1936-05-15 Baermann Max Jr Verfahren zur Herstellung von permanenten Magneten.
US3158797A (en) * 1961-10-31 1964-11-24 Stackpole Carbon Co Device for magnetizing circular magnets
DE3214176A1 (de) 1982-04-17 1983-10-20 Erich Dr.-Ing. 5300 Bonn Steingroever Vielpolige magnetisiervorrichtung fuer dauermagnete
DE3506757A1 (de) * 1984-09-22 1986-08-28 Erich Dr.-Ing. 5300 Bonn Steingroever Magnetisiervorrichtung fuer dauermagnete
US4638280A (en) * 1985-10-29 1987-01-20 Dietrich Steingroever Multipolar magnetizing device provided with cooling means
SU1670705A1 (ru) * 1988-10-01 1991-08-15 Всесоюзный Научно-Исследовательский Проектно-Конструкторский Институт Технологии Электрических Машин Малой Мощности Индуктор дл импульсного намагничивани многополюсных роторов
DE3901303A1 (de) * 1989-01-18 1990-07-19 Gerd Pruschke Magnetisiervorrichtung fuer dauermagnete

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Publication number Publication date
SI21630A (sl) 2005-04-30
SI1513169T1 (sl) 2016-10-28
EP1513169A2 (de) 2005-03-09
EP1513169A3 (de) 2009-12-23

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