EP0034552B1 - Procédé et dispositif pour l'aimantation multipolaire d'un matériau en bandes - Google Patents

Procédé et dispositif pour l'aimantation multipolaire d'un matériau en bandes Download PDF

Info

Publication number
EP0034552B1
EP0034552B1 EP81420014A EP81420014A EP0034552B1 EP 0034552 B1 EP0034552 B1 EP 0034552B1 EP 81420014 A EP81420014 A EP 81420014A EP 81420014 A EP81420014 A EP 81420014A EP 0034552 B1 EP0034552 B1 EP 0034552B1
Authority
EP
European Patent Office
Prior art keywords
magnets
strip
magnetization
stack
elements
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
Application number
EP81420014A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0034552A1 (fr
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/fr
Application granted granted Critical
Publication of EP0034552B1 publication Critical patent/EP0034552B1/fr
Expired legal-status Critical Current

Links

Images

Classifications

    • 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.
  • 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 of the highly coercive materials, to achieve a multipolar magnetization of very variable shape and to allow a very high speed of movement of the strip, for example several tens of meters per minute.
  • the multipolar magnetization device for 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 a high coercive field, here called "main magnets and pole pieces made of magnetically soft material, the direction of magnetization of the main magnets having a component perpendicular to the large faces of the elements and two opposites for the two main magnets adjacent to a 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 parallel to the large faces of the flat elements and the plane of the strip being general in a plane perpendicular to the large faces of the elements.
  • the main magnets preferably, magnets made of cobalt-rare earth alloy are chosen.
  • 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 travels 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 parallel to the plan of the large faces.
  • the term “plane of the strip and” axis of travel respectively means the plane tangent to the strip on the generator of the strip closest to the magnetizer and the tangent to the curve of advance 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 N-S are opposite.
  • the pole pieces serving 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 neutral zones, located on the same width of the strip.
  • the two stacks are placed face to face, so that the elements of the same nature of each stack are facing each other and that the directions of magnetization NS of two magnets main opposite are of 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 tapers in the vicinity of the strip, for example a trapezoidal section whose small base is situated 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 more permanent magnets, called magnets field, located at the periphery of the stack and whose direction of magnetization NS is parallel to the axis of travel 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 in the vicinity of 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 pole 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.
  • 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 non-crossing, as shown in FIG. 2, when on this same width of the strip and on only one of the faces, there is an alternating succession of North and South poles separated by neutral zones, the lines of field closing on this face and 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 an iron-cobalt alloy containing 35% 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) travels in a plane perpendicular to the large faces of the stack and in a direction (or scrolling axis) parallel to the small bases (4) of the trapezoidal flat elements.
  • the two stacks define 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 straight cylindrical side 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 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 take the form of a stack of circular discs rotating around an axis, but the field magnets (8) and the contiguous pole part remain fixed, as shown diagrammatically in FIG. 8.
  • an intermediate magnet (9) which 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, there is thus obtained a succession of S main magnets (1) and intermediate magnets (9), the latter being 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.
  • non-traversing 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) in non-through magnetization and 0.65 Tesla (6500 Gauss) in through magnetization is obtained in the air gap with a thickness of 3 mm for a flexible strip of 3 mm thickness.
  • a stack of discs with a diameter of 20 mm is produced, movable around an axis, these discs being alternately SmCo 5 magnets with a thickness of 1.3 mm and pole pieces made of Fe-Co alloy with a thickness of 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 of the air gap (in 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 stacking system of Example 1.
  • the field in the air gap is then increased by 10%.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (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)
  • Soft Magnetic Materials (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)
  • Treatments Of Macromolecular Shaped Articles (AREA)
  • Magnetic Record Carriers (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Mixers With Rotating Receptacles And Mixers With Vibration Mechanisms (AREA)
  • Non-Mechanical Conveyors (AREA)
  • Decoration Of Textiles (AREA)
  • Manufacture Of Motors, Generators (AREA)
  • Machine Translation (AREA)
EP81420014A 1980-02-15 1981-02-12 Procédé et dispositif pour l'aimantation multipolaire d'un matériau en bandes Expired EP0034552B1 (fr)

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 EP0034552A1 (fr) 1981-08-26
EP0034552B1 true EP0034552B1 (fr) 1983-12-28

Family

ID=9238778

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81420014A Expired EP0034552B1 (fr) 1980-02-15 1981-02-12 Procédé et dispositif pour l'aimantation multipolaire d'un matériau en bandes

Country Status (17)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3533968A1 (de) * 1985-09-24 1987-03-26 Weinsheim Chemie Verfahren und vorrichtung zur magnetisierung von magnetisierbares material enthaltenden schichten

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
HU190975B (en) * 1984-09-28 1986-12-28 Elzett Muevek,Hu Magnetizing device for magnetizing key-magnets and rotor magnets of magnetic system safety lock
WO1991011537A1 (en) * 1990-01-30 1991-08-08 Ufimsky Neftyanoi Institut Method and device for thermomagnetic treatment of articles
JPH07505977A (ja) * 1992-04-14 1995-06-29 アールゼーエフ　インターナショナル　コーポレイション 増強された磁気引力を有する磁化材料及びこの材料を多極磁化する方法及び装置
US5424703A (en) * 1992-05-08 1995-06-13 The Electrodyne Company, Inc. Magnetization of permanent magnet strip materials
DE4301771C2 (de) * 1993-01-23 1995-06-29 Steingroever Magnet Physik Magnetisiervorrichtung für Dauermagnet-Folien mit streifenförmigen Polen
EP0715300A3 (en) 1994-11-30 1997-02-05 Eastman Kodak Co Magnetic roller recorder with very high field
DE4442917C2 (de) * 1994-12-01 1998-12-03 Wst Steuerungstechnik Gmbh Verfahren zum Aufbringen von Magnetmarken
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
US9208934B1 (en) 2007-03-16 2015-12-08 Magnum Magnetics Corporation Material magnetizer systems
CN103282280B (zh) 2010-10-27 2016-02-10 洲际大品牌有限责任公司 磁性可闭合的产品容置包装
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
JP7444855B2 (ja) 2018-08-30 2024-03-06 ムーグ インコーポレーテッド リングコイル及び蛇行コイルを有するクローポールモータ
CN111341520B (zh) * 2020-03-23 2021-08-06 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

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2501615A (en) * 1946-03-07 1950-03-21 Western Electric Co Method of forming magnetic field patterns
DK90770C (da) * 1954-04-22 1961-04-24 Philips Nv Magnetsystem indeholdende to dele, der hver har et antal pladeformede permanentmagneter adskilt fra hinanden ved ligeledes pladeformede, men tyndere legemer.
US3467926A (en) * 1967-04-07 1969-09-16 Cloyd D Smith Combined magnetizer and demagnetizer
US4292261A (en) * 1976-06-30 1981-09-29 Japan Synthetic Rubber Company Limited Pressure sensitive conductor and method of manufacturing the same

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3533968A1 (de) * 1985-09-24 1987-03-26 Weinsheim Chemie Verfahren und vorrichtung zur magnetisierung von magnetisierbares material enthaltenden schichten

Also Published As

Publication number Publication date
NO156738B (no) 1987-08-03
IE810288L (en) 1981-08-15
IT8119681A0 (it) 1981-02-12
JPS6137766B2 (enrdf_load_stackoverflow) 1986-08-26
IN153578B (enrdf_load_stackoverflow) 1984-07-28
EP0034552A1 (fr) 1981-08-26
JPS56131909A (en) 1981-10-15
FR2476375B1 (enrdf_load_stackoverflow) 1983-10-07
US4379276A (en) 1983-04-05
FR2476375A1 (fr) 1981-08-21
ATE5750T1 (de) 1984-01-15
LU83131A1 (fr) 1981-09-11
DK62481A (da) 1981-08-16
IE50917B1 (en) 1986-08-20
MX150049A (es) 1984-03-05
IT1135431B (it) 1986-08-20
CH642764A5 (fr) 1984-04-30
DE3161723D1 (en) 1984-02-02
BE887520A (fr) 1981-08-13
CA1163673A (fr) 1984-03-13
BR8100871A (pt) 1981-08-25
NO810487L (no) 1981-08-17
NO156738C (no) 1987-11-11

Similar Documents

Publication Publication Date Title
EP0034552B1 (fr) Procédé et dispositif pour l'aimantation multipolaire d'un matériau en bandes
CA1067954A (fr) Plateau magnetique a aimants permanents et electro-permanents
EP0974185B1 (fr) Actionneur lineaire ameliore
FR2466673A1 (fr) Frein commutable a aimantation permanente
EP0636272B1 (en) Magnetized material having enhanced magnetic pull strength and a process and apparatus for the multipolar magnetization of the material
FR2651367A1 (fr) Procede et appareil pour former des zones magnetisees sur un corps magnetisable.
EP0713604B1 (fr) Actionneur electromagnetique monophase a faible course presentant un bon rapport force sur puissance electrique
WO2016062844A1 (fr) Moteur polyphasé présentant une alternance d'aimants permanents et de pôles saillants
EP0138642A1 (fr) Structure ferromagnétique d'une source d'ions créée par des aimants permanents et des solénoides
FR2941106A1 (fr) Machine electrique tournante a poles saillants
BE537552A (fr) Systeme magnetique
FR2526603A1 (fr) Moteur lineaire a tige et glissiere de guidage
EP3652845B1 (fr) Convertisseur d'energie electromagnetique
EP0174322B1 (fr) Dispositif d'aimantation multipolaire
EP0268619B1 (fr) Dispositif d'actionnement electromagnetique
EP1581991B1 (fr) Actionneur rotatif bistable monophase hybride
FR3062947A1 (fr) Methode d'aimantation, dispositif d'aimantation et aimant pour codeur magnetique
FR2793066A1 (fr) Procede et dispositif pour la demagnetisation de produits de faible epaisseur
KR840002411B1 (ko) 스트립형 재료의 다극자화 장치
FR2571173A1 (fr) Dispositif d'aimantation, notamment pour des aimants de cles et des serrures magnetiques de securite
CH459368A (fr) Procédé d'aimantation de roues magnétiques pour engrenage magnétique et dispositif pour la mise en oevre du procédé
FR2704993A1 (fr) Dispositif à moteur électrique linéaire pour déplacer un ou plusieurs chariots sur piste commune.
EP0639839A1 (fr) Dispositif de magnétisation ou démagnétisation d'un produit metallique
FR2462805A1 (fr) Inducteur pour machine electrique a entrefer axial
WO2003098783A1 (fr) Moteur lineaire

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT DE GB NL SE

17P Request for examination filed

Effective date: 19810901

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Designated state(s): AT DE GB NL SE

REF Corresponds to:

Ref document number: 5750

Country of ref document: AT

Date of ref document: 19840115

Kind code of ref document: T

REF Corresponds to:

Ref document number: 3161723

Country of ref document: DE

Date of ref document: 19840202

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19840331

Year of fee payment: 4

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19850111

Year of fee payment: 5

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 19870119

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19870228

Year of fee payment: 7

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Effective date: 19880212

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19880213

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19880901

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19881101

GBPC Gb: european patent ceased through non-payment of renewal fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19881118

EUG Se: european patent has lapsed

Ref document number: 81420014.3

Effective date: 19880927