EP0034552A1 - Verfahren und Vorrichtung zur vielpoligen Magnetisierung eines streifenförmigen Materials - Google Patents

Verfahren und Vorrichtung zur vielpoligen Magnetisierung eines streifenförmigen Materials Download PDF

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Publication number
EP0034552A1
EP0034552A1 EP81420014A EP81420014A EP0034552A1 EP 0034552 A1 EP0034552 A1 EP 0034552A1 EP 81420014 A EP81420014 A EP 81420014A EP 81420014 A EP81420014 A EP 81420014A EP 0034552 A1 EP0034552 A1 EP 0034552A1
Authority
EP
European Patent Office
Prior art keywords
strip
magnets
magnetization
stack
pole pieces
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.)
Granted
Application number
EP81420014A
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English (en)
French (fr)
Other versions
EP0034552B1 (de
Inventor
Claude Bouchara
Robert Henaff
Pierre Jacob
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.)
Aimants Ugimac SA
Ugimag SA
Original Assignee
Aimants Ugimac SA
Ugimag SA
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 Aimants Ugimac SA, Ugimag SA filed Critical Aimants Ugimac SA
Priority to AT81420014T priority Critical patent/ATE5750T1/de
Publication of EP0034552A1 publication Critical patent/EP0034552A1/de
Application granted granted Critical
Publication of EP0034552B1 publication Critical patent/EP0034552B1/de
Expired 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
    • H01F41/0253—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
    • 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

Definitions

  • the present invention relates to a device for carrying out the multipolar magnetization of a magnetizable material in the form of sheets or strips, more particularly flexible strips of relatively small thickness of the magnetic rubber type.
  • production rates are often limited to a strip speed of less than 1 m / min, and even much less in the case of double-sided multipolar magnetization.
  • the object of the present invention relates to a device for magnetizing sheet or strip materials which eliminates all the drawbacks mentioned above, in which the magnetic field is created by permanent magnets capable of magnetizing at technical saturation.
  • highly coercive materials to make a mul t ipo- lar magnetization of greatly varying shape and allow a scroll speed of the high band, for example several tens of meters per minute.
  • the multipolar magnetization device of a strip material on one face or on two faces, object of the present invention consists in producing one or two stacks on their large parallel faces, of flat prismatic elements, these elements being alternately permanent magnets with high coercive force, referred to herein as "main magnets" and polar material in Magnemite parts q uement soft, the direction of magnetization of the main magnets having a nerpendi vide component to the large faces of the elements in opposite directions for the two magnets principal adjacent to the same pole piece; to magnetize a strip, it is scrolled in the immediate vicinity or against a stack or, in the same way, in an air gap between two stacks, preferably in a direction substantially parallel to the large faces of the flat elements and the plane of the strip being generally in a plane perpendicular to the large faces of the elements.
  • the magnetically soft material used for the pole pieces is preferably soft iron or an iron-cobalt alloy, but it is also possible to use permalloy, iron-nickel alloys, silicon or carbon steels, soft ferrites, according to the required magnetic permeability.
  • the strip is passed through the air gap defined by two stacks placed face to face.
  • a non-traversing magnetization it suffices to use a single stack or to replace the second with a block of soft iron (or other ferromagnetic material) or any other non-magnetic device ensuring for example the displacement and the guiding of the strip or sheet.
  • the flat elements are delimited by two large parallel faces and the stacking takes place on these large faces.
  • the strip runs in the air gap or in the vicinity of the active part of the magnetizer, it is generally in a plane perpendicular to these large faces and it advances in a direction called the running axis, which is substantially parallel in terms of the large faces.
  • the term “plane of the strip” and “axis of travel” respectively mean the tangent plane to the strip on the generatrix of the strip closest to the magnetizer and the tangent to the advance curve of a point of the strip located in the previous tangent plane.
  • the direction of magnetization of the main magnets is not parallel to the large faces of these magnets and of the adjacent pole pieces.
  • the directions of magnetization NS are opposite.
  • the pole pieces used to channel towards the air gap or the surface of the magnetizer the magnetic flux produced by the opposing magnets we have, at the outlet of the pole pieces on the surface of the magnetizer, an alternation of the North and South poles separated by zones neutral, located on the same width of the strip.
  • the two stacks are placed facing each other, so that the elements of the same nature of each stack are facing each other and that the directions of magnetization NS of two facing main magnets are in opposite directions.
  • the device according to the invention may include several non-limiting variants of the scope of the invention.
  • the stacked flat elements have a lateral surface which narrows in the vicinity of the strip, for example a trapezoidal section whose small base is located on the side of the strip, so as to orient and concentrate the magnetic flux towards this one.
  • These sections do not necessarily determine a prismatic lateral surface of the stack.
  • the stacked pole pieces have the shape of circular discs, having a cylindrical outer surface of revolution, movable around a non-ferromagnetic axis, which eliminates any sliding of the strip relative to the magnet when these discs rotate at an appropriate speed; the main magnets then have a base inscribed in (or equal to) the base of the pole pieces.
  • these discs can be driven and / or mounted idly on their axis.
  • the inside diameter of the pole pieces be greater than the inside diameter of the main magnets.
  • the invention also relates to an improved device compared to the previous device, characterized in that the pieces of the stack are brought, in addition, into contact with one or or several permanent magnets, called field magnets, located at the periphery of the stack and whose direction of magnetization NS is parallel to the running axis of the strip and in the same direction. Therefore, the direction of magnetization of the field magnets is parallel to the plane of the large faces of the stack and perpendicular to the direction of magnetization of the permanent magnets of the stack.
  • the pole pieces have a larger section than that of the main magnets and they enclose them completely; they alone are in contact with the field magnets and have a general form of "comb".
  • the main magnets which then play the role of anti-leakage magnets, work mainly in the third quadrant of the hysteresis cycle, which makes it possible to increase the magnetomotor force which they generate and, consequently, the field of the air gap (or near the poles).
  • the comb system can also consist of a stack of discs and be rotatable about an axis, but in this case, only the main magnets and the ends of the combs located between the main magnets, are mobile, the field magnets and the contiguous polar part remaining fixed and as close as possible to the mobile parts.
  • the field obtained in the air gap can be further increased by inserting between two main magnets adjacent to the same pole piece and replacing a part of said pole piece, an intermediate magnet attached to these two main magnets and located alternately at the before and at the rear of the stack in the direction of the axis of travel of the strip, the direction of magnetization NS of these intermediate magnets being parallel to the axis of travel of the strip and in the opposite direction.
  • Figures 1 and 2 show in cross section a magnetic strip respectively through and non-through magnetization.
  • Figures 3 and 4 show respectively in section, along aa '- (fig.4) and bb' (fig.3), a through magnetization device with simple stack of trapezoidal contour elements.
  • Figures 5 and 6 respectively show a sectional view, along cc '(fig. 6) and dd' (fig.5), of a through magnetization device with simple stack of elements in the form of circular discs.
  • Figure 7 shows a side view and in partial section, along cc '(fig.9), a non-through magnetization device with combs.
  • FIG. 8 represents the lower part of a comb device for through magnetization comprising a movable stack in the vicinity of the strip, seen in section.
  • FIG. 9 is a plan view of the device shown in FIG. 7.
  • a strip of magnetizable material has a through magnetization as shown in Figure 1 when it has on the two faces in the width direction a succession of South poles and alternating North poles separated by neutral zones; when this arrangement is periodic, the distance between two neighboring poles defines the polar pitch of the magnetization.
  • the field lines cross the thickness of the strip, being approximately perpendicular to the faces.
  • the magnetization is not overall length, as shown in Figure 2, when on the same width of the strip and on one of the faces, there is a p alternating succession oles North and South separated by neutral zones, lines field closing on this face and not practically not crossing the thickness of the strip.
  • the device represented in FIGS. 3 and 4 comprises two stacks on their large faces, of flat elements which are alternately permanent magnets (1), for example made of cobalt-rare earth alloy, with high coercive field and ferromagnetic pole pieces (2 ), for example in iron-cobalt alloy with 35X cobalt.
  • the large faces of these flat elements have a profile which, in the vicinity of the strip (3) is trapezoidal as it appears in FIG. 4, the small base (4) of the trapezium facing the strip (3).
  • Each of the stacks is held by supports (5) made of soft iron or any other magnetically soft material.
  • Two magnets (1) located on either side of the same pole piece (2) have overall magnetization directions preferably perpendicular to the plane of the large faces of the stack and in opposite directions.
  • the strip (3) runs in a plane substantially perpendicular to the large faces of the stack and in a direction (or running axis) substantially parallel to the small bases (4) of the trapezoidal flat elements.
  • the two stacks delimit an air gap (6).
  • Each main magnet (1) and each pole piece (2) of one of the stacks is respectively located opposite a magnet and of a pole piece of the other similar stack.
  • the magnetization directions are in opposite directions. One thus obtains in the air gap to the right of the pole pieces, a succession of field lines and alternating directions, represented by the arrows which will print on the width of the strip (3) running in the air gap (6), a alternating succession of North and South poles separated by neutral zones.
  • the stacks are formed of flat elements, main magnets (1) and pole pieces (2), in the form of circular discs, movable around an axis (7) and having a surface single right cylindrical lateral and rotating at a speed such that any slippage of the strip relative to the magnet is eliminated.
  • the pole pieces (2) have a larger section than that of the magnets (1) and extend beyond the stack, completely surrounding the magnets (1) to form a sort of comb. These pole pieces (2) are in contact with field magnets (8) which give them a certain magnetic potential.
  • the direction of magnetization of these field magnets (8) is parallel to the running axis (11) of the strip (3), that is to say also parallel to the large faces of the stack and to the plane of the strip and, therefore, perpendicular to the magnetization directions of the magnets (I), as shown in Figure 9.
  • the presence of the field magnets (8) makes it possible to increase the magnetomotive force generated by the magnets (1) and, therefore, the field of the air gap.
  • the flux created by the field magnets (8) is forced, because of the presence of the main magnets (1), to pass through the strip (3).
  • the active part of this system can be in the form of a stack of circular discs rotating around an axis, but the field magnets (8) and the adjacent polar part remain fixed, as shown diagrammatically in FIG. 8.
  • an intermediate magnet (9) part of the pole piece located between two main magnets (1) is replaced by an intermediate magnet (9).
  • This intermediate magnet has the form of a bar perpendicular to the plane of the strip (3), attached to the two main magnets (1) and located, relative to the axis of travel of the strip, alternately at the front and at the back of the stack. As shown in FIG. 9, one thus obtains an S-shaped succession of main magnets (1) and intermediate magnets (9), the latter being arranged staggered at the ends of the adjacent magnets (1).
  • a magnetizer comprising two similar stacks located one opposite the other and delimiting an air gap in which the strip (3) runs.
  • the main magnets (1) of each of the stacks face each other, as do the pole pieces, and the directions of magnetization of two magnets face to face on either side of the air gap are not parallel to the faces. and their results are in opposite directions.
  • To obtain a non-crossing magnetization only half of the magnet is used, the other half being removed or replaced by a soft iron roller, or by a non-magnetic device ensuring the movement and guiding of the sheet. or tape.
  • a stack of fixed magnets made of SmCo 5 alloy 2.5 mm thick and pole pieces made of Fe-Co alloy 2 mm thick is produced.
  • An induction of 0.4 Tesla (4000 Gauss) is obtained in the air gap with a thickness of 3 mm. non-through magnetization and 0.65 Tesla (6500 Gauss) through magnetization for a flexible strip 3 mm thick.
  • a stack of 20 mm diameter discs is made, movable around of an axis, these discs being alternately SmCo 5 magnets of thickness 1.3 mm and pole pieces of Fe-Co alloy of thickness 1.2 mm.
  • Such a device makes it possible to magnetize at saturation a magnetic rubber band with barium ferrite of thickness less than or equal to 1 mm in through or non-through magnetization.
  • the value of the field in the air gap (in the air) is 380 kA / m for a distance of 4 mm and reaches 1000 kA / m for a distance of 0.8 mm.
  • a comb system with intermediate magnets is produced, having the same characteristics as the simple stack system of example l.
  • the field in the air gap is then increased by 10%.

Landscapes

  • Power Engineering (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)
  • Hard Magnetic Materials (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)
  • Magnetic Treatment Devices (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)
  • Soft Magnetic Materials (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Manufacture Of Motors, Generators (AREA)
  • Non-Mechanical Conveyors (AREA)
  • Mixers With Rotating Receptacles And Mixers With Vibration Mechanisms (AREA)
  • Magnetic Record Carriers (AREA)
  • Decoration Of Textiles (AREA)
  • Treatments Of Macromolecular Shaped Articles (AREA)
  • Machine Translation (AREA)
EP81420014A 1980-02-15 1981-02-12 Verfahren und Vorrichtung zur vielpoligen Magnetisierung eines streifenförmigen Materials Expired EP0034552B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81420014T ATE5750T1 (de) 1980-02-15 1981-02-12 Verfahren und vorrichtung zur vielpoligen magnetisierung eines streifenfoermigen materials.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8003758A FR2476375A1 (fr) 1980-02-15 1980-02-15 Dispositif pour l'aimantation multipolaire d'un materiau en bandes
FR8003758 1980-02-15

Publications (2)

Publication Number Publication Date
EP0034552A1 true EP0034552A1 (de) 1981-08-26
EP0034552B1 EP0034552B1 (de) 1983-12-28

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ID=9238778

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81420014A Expired EP0034552B1 (de) 1980-02-15 1981-02-12 Verfahren und Vorrichtung zur vielpoligen Magnetisierung eines streifenförmigen Materials

Country Status (17)

Country Link
US (1) US4379276A (de)
EP (1) EP0034552B1 (de)
JP (1) JPS56131909A (de)
AT (1) ATE5750T1 (de)
BE (1) BE887520A (de)
BR (1) BR8100871A (de)
CA (1) CA1163673A (de)
CH (1) CH642764A5 (de)
DE (1) DE3161723D1 (de)
DK (1) DK62481A (de)
FR (1) FR2476375A1 (de)
IE (1) IE50917B1 (de)
IN (1) IN153578B (de)
IT (1) IT1135431B (de)
LU (1) LU83131A1 (de)
MX (1) MX150049A (de)
NO (1) NO156738C (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2571173A1 (fr) * 1984-09-28 1986-04-04 Elzett Muevek Dispositif d'aimantation, notamment pour des aimants de cles et des serrures magnetiques de securite
DE4301771A1 (de) * 1993-01-23 1994-07-28 Steingroever Magnet Physik Magnetisiervorrichtung für Dauermagnet-Folien mit streifenförmigen Polen
EP0639292A1 (de) * 1992-05-08 1995-02-22 Electrodyne Co Magnetisierung von permanentmagnetischen bandmaterialen.
DE4442917A1 (de) * 1994-12-01 1996-06-05 Wst Steuerungstechnik Gmbh Verfahren zum Aufbringen von Magnetmarken
US9208934B1 (en) 2007-03-16 2015-12-08 Magnum Magnetics Corporation Material magnetizer systems
CN111341520A (zh) * 2020-03-23 2020-06-26 东莞市融贤实业有限公司 一种喇叭主、副磁体一次同时充磁的方法

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3533968C2 (de) * 1985-09-24 1995-06-08 Weinsheim Chemie Vorrichtung zur Magnetisierung von magnetisierbares Material enthaltenden Schichten
WO1991011537A1 (en) * 1990-01-30 1991-08-08 Ufimsky Neftyanoi Institut Method and device for thermomagnetic treatment of articles
CA2117796C (en) * 1992-04-14 2000-08-15 Raymond C. Srail Magnetized material having enhanced magnetic pull strength and a process and apparatus for the multipolar magnetization of the material
EP0715300A3 (de) 1994-11-30 1997-02-05 Eastman Kodak Co Aufnahmegerät mit sehr hohem Feld aufweisender Magnetwalze
US6233407B1 (en) 1995-11-20 2001-05-15 Eastman Kodak Company Camera with magnetic roller recorder for repetitively recording information along magnetic track on filmstrip
US6134821A (en) * 1998-01-16 2000-10-24 Magnum Magnetics Magnetic signage systems and processes related thereto
US7148778B2 (en) * 2001-11-30 2006-12-12 The Regents Of The University Of California High performance hybrid magnetic structure for biotechnology applications
US6954128B2 (en) * 2001-11-30 2005-10-11 The Regents Of The University Of California High performance hybrid magnetic structure for biotechnology applications
US7501921B2 (en) * 2005-05-13 2009-03-10 Magnetnotes, Ltd. Temperature controlled magnetic roller
US8115583B2 (en) * 2006-11-15 2012-02-14 Vasily Lensky Generation of multipolar electromagnetic energy
EP2632809B1 (de) 2010-10-27 2015-11-18 Intercontinental Great Brands LLC Magnetisch verschliessbare verpackung für ein produkt
US8866572B2 (en) * 2011-02-19 2014-10-21 A. Todd McMullen Special random magnetization apparatus and process for thin sheet magnetic sheets and rolls
US9455078B2 (en) * 2014-07-29 2016-09-27 Magnum Magnetics Corporation Non-linear multi-pole magnetization of flexible magnetic sheets
US11509203B2 (en) 2018-07-25 2022-11-22 Moog Inc. Claw-pole motor with rotor flux concentrators and poles and stator with solenoid coil and alternating stator teeth
US11581762B2 (en) 2018-08-30 2023-02-14 Moog Inc. Claw pole motor with a ring coil and a meandering coil

Citations (1)

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FR1564140A (de) * 1967-04-07 1969-04-18

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US2501615A (en) * 1946-03-07 1950-03-21 Western Electric Co Method of forming magnetic field patterns
ES221304A1 (es) * 1954-04-22 1955-06-01 Philips Nv Un sistema magnetico de la clase que comprende dos o mas pares adyascentes, cada una de las cuales contiene un gran numero de imanes permanentes
US3127544A (en) * 1960-11-18 1964-03-31 Leyman Corp Apparatus for magnetizing permanent magnet materials to form band-like poles thereon
US3671893A (en) * 1970-11-18 1972-06-20 Gen Electric Magnetic latch and switch using cobalt-rare earth permanent magnets
US3879754A (en) * 1973-11-29 1975-04-22 Honeywell Inc Magnetic field producing apparatus
FR2273749A1 (fr) * 1974-06-10 1976-01-02 Inst Manipulacnich Dopravnich Dispositif pour la manutention en accrochage de matieres ferromagnetiques sans ouvriers accrocheurs
US4292261A (en) * 1976-06-30 1981-09-29 Japan Synthetic Rubber Company Limited Pressure sensitive conductor and method of manufacturing the same

Patent Citations (1)

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Publication number Priority date Publication date Assignee Title
FR1564140A (de) * 1967-04-07 1969-04-18

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2571173A1 (fr) * 1984-09-28 1986-04-04 Elzett Muevek Dispositif d'aimantation, notamment pour des aimants de cles et des serrures magnetiques de securite
EP0639292A1 (de) * 1992-05-08 1995-02-22 Electrodyne Co Magnetisierung von permanentmagnetischen bandmaterialen.
EP0639292A4 (en) * 1992-05-08 1995-03-08 The Electrodyne Company Magnetization of permanent magnet strip materials.
DE4301771A1 (de) * 1993-01-23 1994-07-28 Steingroever Magnet Physik Magnetisiervorrichtung für Dauermagnet-Folien mit streifenförmigen Polen
DE4442917A1 (de) * 1994-12-01 1996-06-05 Wst Steuerungstechnik Gmbh Verfahren zum Aufbringen von Magnetmarken
DE4442917C2 (de) * 1994-12-01 1998-12-03 Wst Steuerungstechnik Gmbh Verfahren zum Aufbringen von Magnetmarken
US9208934B1 (en) 2007-03-16 2015-12-08 Magnum Magnetics Corporation Material magnetizer systems
CN111341520A (zh) * 2020-03-23 2020-06-26 东莞市融贤实业有限公司 一种喇叭主、副磁体一次同时充磁的方法

Also Published As

Publication number Publication date
EP0034552B1 (de) 1983-12-28
NO810487L (no) 1981-08-17
NO156738C (no) 1987-11-11
JPS6137766B2 (de) 1986-08-26
IT8119681A0 (it) 1981-02-12
CH642764A5 (fr) 1984-04-30
US4379276A (en) 1983-04-05
FR2476375A1 (fr) 1981-08-21
MX150049A (es) 1984-03-05
ATE5750T1 (de) 1984-01-15
NO156738B (no) 1987-08-03
DE3161723D1 (en) 1984-02-02
IN153578B (de) 1984-07-28
IT1135431B (it) 1986-08-20
CA1163673A (fr) 1984-03-13
IE810288L (en) 1981-08-15
DK62481A (da) 1981-08-16
IE50917B1 (en) 1986-08-20
FR2476375B1 (de) 1983-10-07
LU83131A1 (fr) 1981-09-11
BE887520A (fr) 1981-08-13
BR8100871A (pt) 1981-08-25
JPS56131909A (en) 1981-10-15

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