US3710291A - Permanent magnet - Google Patents

Permanent magnet Download PDF

Info

Publication number
US3710291A
US3710291A US00199647A US3710291DA US3710291A US 3710291 A US3710291 A US 3710291A US 00199647 A US00199647 A US 00199647A US 3710291D A US3710291D A US 3710291DA US 3710291 A US3710291 A US 3710291A
Authority
US
United States
Prior art keywords
pieces
magnetic
permanent magnet
stator
shaped
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
US00199647A
Other languages
English (en)
Inventor
G Nicoud
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.)
SERMAG
SOC D ETUDES ET DE RECHERCHES MAGNETIQUES SERMAG FR
Original Assignee
SERMAG
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 SERMAG filed Critical SERMAG
Application granted granted Critical
Publication of US3710291A publication Critical patent/US3710291A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K23/00—DC commutator motors or generators having mechanical commutator; Universal AC/DC commutator motors
    • H02K23/02—DC commutator motors or generators having mechanical commutator; Universal AC/DC commutator motors characterised by arrangement for exciting
    • H02K23/04—DC commutator motors or generators having mechanical commutator; Universal AC/DC commutator motors characterised by arrangement for exciting having permanent magnet excitation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/02—Permanent magnets [PM]
    • H01F7/0205—Magnetic circuits with PM in general
    • H01F7/021—Construction of PM
    • H01F7/0215—Flexible forms, sheets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/17—Stator cores with permanent magnets
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49009—Dynamoelectric machine
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/4902—Electromagnet, transformer or inductor
    • Y10T29/49075—Electromagnet, transformer or inductor including permanent magnet or core

Definitions

  • the present invention relates to permanent magnets and, more particularly, to magnets made of a material having a high coercive force, from which the ferrites are a preferred example.
  • magnets In the above application and also in the manufacture of magnets, the attractive force of which will be used for various purposes, for instance insulating closing devices or fixing devices, use has been made in prior art of a permanent magnet material usually termed "magnetic rubber.”
  • This material has been disclosed in French Pat. Specification No. 1,135,734 filed on Nov. 24, 1955 by the firm Tesla Narodin Podnik.” It consists of an elastic binder mixed with ferrite powder. It has the property of adhering, due to its elasticity, to plane or profiled surfaces. It is adapted, moreover, to be subsected to various types of magnetization.
  • the (BH) max product there of is for instance between 1.3 and 1.8, as compared to between 2.5 and 3.5 for the tiles and consequently, the use of such a material for manufacturing certain types of stators is prohibited.
  • a magnet will combine the advantages of both the conventional magnets and the magnetic rubber, without having their drawbacks.
  • Permanent magnets are priorly known which combine a plurality of piece of an Alnico type alloy fixed to a support.
  • the support is a rigid yoke sintered at the same time as the pieces.
  • the rigidity should be lowered by opering out notches in the support. This does not provide a magnet having the same flexibility as a magnetic rubber and adapted for the same kind of applications.
  • a permanent magnet comprising a plurality of pieces made of hard magnetic material fastened to a supporting member and magnetized in a direction substantially at right angles with said supporting member, has the supporting member made of at least one thin flexible sheet on which the said pieces are stuck.
  • the said sheet is made of a non magnetic material, the pieces being made of ferrite and having a magnetization which alternates with a given pitch.
  • all the pieces are magnetized so as to present the same polarity along their contact surface with the supporting member and the latter may then be indifferently made from a magnetic or non magnetic material.
  • FIG. 1 is a perspective view of a permanent magnet according to the invention
  • FIG. 2 is a plan view showing two such magnets mounted in a stator arrangement and
  • FIG. 3 shows a portion of a magnet with alternate poles.
  • FIG. 1 a comparatively pliant supporting member 1, for instance made of a steel ribbon or sheet of other metal, such as aluminum or brass, or even paper or other material, either magnetic or not.
  • a layer of glue 2 affords fastening of magnetic pieces, advantageously made of ferrite, cut out of a massive block.
  • a plurality of small juxtaposed bars, 3, 4, 5 having for instance a length of 2 cm, a width of 7 mm and a thickness of 4 mm will be adapted for manufacturing a stator tile.
  • the illustrated shape and arrangement of the magnetic pieces are by no way limiting, and will depend upon the desired application.
  • the bars will be subjected to a further cutting operation through directions at right angle with those of the first cutting operation. This will render the arrangement deformable along two mutually perpendicular directions.
  • the cutting operation(s) may be effected either before or after the lay out and fastening of the magnetic pieces on their supporting member, while the magnetization in effected last of all, in a direction substantially perpendicular to the surface of the support.
  • HO. 2 illustrates a particularly advantageous application.
  • Reference numeral 6 is the yoke of a motor stator, 7 and 8 two tiles made of ferrite bars stuck on two steelribbons (7a and 80 respectively), in accordance with the technique illustrated in H0. 1. All the bars of a same tile are magnetized radially with the same polarity and the magnetic sheets and act as pole pieces.
  • the "tiles" thus obtained are adapted to the design of stators of various diameters.
  • tiles may have as small a thickness as desired, with respect to the stator diameter. No machining tool is necessary and the manufacture is quite simple and may be automatized.
  • tiles For example, for use in a DC. motor having a 40 mm diameter rotor and with a strontium ferrite cut out into bars having the above mentioned dimensions, tiles have been manufacture in accordance with the above disclosed technique, having a span angle of 140 and providing a flux of 28,500 Maxwell in the rotor with a conventional massive tile made of strontium ferrite, the maximum span angle which may be obtained is with a flux of 29,500 Maxwell through the rotor. With a tile made of magnetic rubber, a span angle of may be obtained,
  • a tile made of bars of 6,5 X U X 26 mm made as disclosed hereinabove may have a span angle as high as 130 and generate a flux of 43,000 Maxwell through the rotor.
  • Such a flux is of the same order of magnitude as that which should be generated by a conventional massive tile, but the latter could not be designed with a span angle exceeding l20.
  • a tile made of magnetic rubber could have a span angle as high as 140, but with a flux not exceeding 30,000 Maxwell.
  • the composite tile of the invention substantially combines the advantages of the two prior art types of tiles, yet without having these drawbacks.
  • the tiles For motors of larger size it would be possible to manufacture the tiles by stiching the ferrite bars on a paper support, shaping the resulting assembly, placing it in a mould and pouring a resin, such as Araldite," about the assembly. The resin will penetrate into the interstices between the bars and, when hardening, will fix the shape of the assembly. The paper support will then be removed and a pole piece thicker than that the said support will be glued in place of it.
  • a resin such as Araldite
  • FIG. 3 there is shown a portion of a permanent magnet made of small ferrite bars, such as 9 to 17, bonded with a glue 18 on a sheet of non magnetic material 19, for instance paper. Bars 9-11 have for instance their North pole engaging the support 18-19, and also the bars -17, while the bars 12 14 have their South pole engaging the support 18 19. It results that the magnetization pattern alternates with a pitch of for instance three bars, such a permanent magnet may be used in the design of a magnetic attraction device or a magnetic coupling.
  • a permanent magnet made of small ferrite bars, such as 9 to 17, bonded with a glue 18 on a sheet of non magnetic material 19, for instance paper. Bars 9-11 have for instance their North pole engaging the support 18-19, and also the bars -17, while the bars 12 14 have their South pole engaging the support 18 19. It results that the magnetization pattern alternates with a pitch of for instance three bars, such a permanent magnet may be used in the design of a magnetic attraction device or a magnetic coupling.
  • a permanent magnet stator tile apparatus comprising: a supporting member; a plurality of pieces of magnetic material attached to said supporting member at a relatively narrow bottom face thereof each of said pieces of magnetic material aligned relatively closely spaced to the next succeeding piece and magnetized in a direction substantially at right angles therewith, wherein each of said pieces has a thickness dimension substantially smaller than its height; the support member comprises at least one thin and flexible sheet on which the same magnetic pieces are stuck.
  • said magnetic pieces are ferrite material shaped as parallelepipeds having a length dimension substantially transverse of said support member, a thickness dimension substantially tangent thereto and a height dimension substantially normal thereto said pieces being magnetized in a direction substantially perpendicular with said support member, wherein each of said pieces are separated by a distance substantially less than its thickness dimension at the point of contact with the support means, and each piece of magnetic material is oriented so as to produce a magnetic field of one polarity in the stator tile assembly.
  • the apparatus as described in claim 1 further including a stator member for supporting an opposite narrow face of each of said pieces within an annular opening thereof, thereof said plurality of pieces and their support member forming a pole piece shaped as a section of a relatively thin ring with radial magnetization.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
  • Power Steering Mechanism (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
US00199647A 1970-11-18 1971-11-17 Permanent magnet Expired - Lifetime US3710291A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7041301A FR2114151A5 (xx) 1970-11-18 1970-11-18

Publications (1)

Publication Number Publication Date
US3710291A true US3710291A (en) 1973-01-09

Family

ID=9064321

Family Applications (1)

Application Number Title Priority Date Filing Date
US00199647A Expired - Lifetime US3710291A (en) 1970-11-18 1971-11-17 Permanent magnet

Country Status (6)

Country Link
US (1) US3710291A (xx)
DE (1) DE2158571A1 (xx)
FR (1) FR2114151A5 (xx)
GB (1) GB1354387A (xx)
IT (1) IT940645B (xx)
NL (1) NL7115880A (xx)

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4002937A (en) * 1975-07-03 1977-01-11 Dickey-John Corporation Magnetic sensing device
US4080542A (en) * 1974-04-08 1978-03-21 Photocircuits Division Of Kollmorgen Corporation High density flux magnetic circuit
US4451811A (en) * 1979-07-30 1984-05-29 Litton Systems, Inc. Magnet structure
US4599826A (en) * 1984-03-05 1986-07-15 Institut Sverkhtverdykh Materialov Akademii Naukukrainskoi Ssr Device for magnetoabrasive machining of workpieces
US4645960A (en) * 1979-07-30 1987-02-24 Litton Systems, Inc. Ferro-fluid bearing
US4834870A (en) * 1987-09-04 1989-05-30 Huron Valley Steel Corporation Method and apparatus for sorting non-ferrous metal pieces
US4869811A (en) * 1988-07-05 1989-09-26 Huron Valley Steel Corporation Rotor for magnetically sorting different metals
WO1991001277A1 (en) * 1989-07-24 1991-02-07 H.K. Research & Development, Inc. Magnetic fluid conditioner
US4998034A (en) * 1988-10-05 1991-03-05 Hitachi, Ltd. Low speed high torque motor with production method
US5275292A (en) * 1992-05-18 1994-01-04 Brugger Richard D Eddy current separator
US5320297A (en) * 1988-01-13 1994-06-14 Beloit Technologies, Inc. Roll-winding apparatus drive mechanism
US5522513A (en) * 1994-03-30 1996-06-04 Howell; Billy R. Separator disc
US5575485A (en) * 1991-11-25 1996-11-19 Industrie Ilpea S.P.A. Magnetic gasket suitable for forming a seal between a fixed part and an openable part
US5682670A (en) * 1992-07-16 1997-11-04 Magnet Applications Limited Method for the fabrication of multipole magnets
WO1999038175A1 (de) * 1998-01-23 1999-07-29 Wampfler Aktiengesellschaft Ferritkern
US20040104636A1 (en) * 2001-02-23 2004-06-03 Ortt Earl M. Stator assembly with an overmolding that secures magnets to a flux ring and the flux ring to a stator housing
US20040113504A1 (en) * 2002-02-22 2004-06-17 Michael Agnes Field assembly for a motor and method of making same
US20050173995A1 (en) * 2004-01-10 2005-08-11 Lg Electronics Inc. Stator for reciprocating motor
FR2910194A1 (fr) * 2006-12-15 2008-06-20 Valeo Equip Electr Moteur Machine electrique tournante, notamment pour demarreur de vehicule automobile
US20100026433A1 (en) * 2006-09-26 2010-02-04 Peter Bugiel Magnet arrangement for magnetic levitation vehicles and method for the production thereof
US20100218365A1 (en) * 2008-05-23 2010-09-02 Panasonic Corporation Manufacturing method of rare earth-iron ring magnet with continuous orientation controlled anisotropy
US20100289348A1 (en) * 2009-05-18 2010-11-18 Compact Dynamics Gmbh Axial flow machine
US20130061431A1 (en) * 2010-05-16 2013-03-14 Gooper Hermetic Ltd. Flexible magnetic sealing apparatus
US20150089794A1 (en) * 2013-10-01 2015-04-02 Whirlpool Corporation Method of manufacturing a rotor for an electric motor for a washing machine
US20160358703A1 (en) * 2015-06-08 2016-12-08 Apple Inc. Thin magnet fabrication
EP2076954A4 (en) * 2006-10-13 2017-08-23 Black & Decker, Inc. Motor with permanent magnets and method of manufacturing; power tool with same
US10993505B1 (en) * 2019-08-29 2021-05-04 Frank Dale Boxberger Flexible magnetic fastening apparatus

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4091300A (en) * 1975-08-30 1978-05-23 Lucas Industries Limited Permanent magnet electrical machines
EP0027308B1 (en) * 1979-08-16 1984-10-24 Inoue-Japax Research Incorporated Manufacture and use of magnetic scale systems
US4486289A (en) * 1982-02-05 1984-12-04 University Of British Columbia, Canada Planar magnetron sputtering device
JPS59159929A (ja) * 1983-02-28 1984-09-10 Nippon Gakki Seizo Kk 磁石材料の製法
GB2223882A (en) * 1988-10-13 1990-04-18 Marconi Co Ltd Magnetic apparatus
US5556540A (en) * 1994-06-30 1996-09-17 Brunsting; William J. Magnetic assembly for a closed pressurized flow path of lubricating oil
DE29515302U1 (de) * 1995-09-25 1995-11-30 Rheinmagnet Horst Baermann GmbH, 53819 Neunkirchen-Seelscheid Magnetanordnung
US5714063A (en) * 1996-05-28 1998-02-03 Brunsting; William J. Apparatus for the removal of ferrous particles from liquids
DE19628722A1 (de) * 1996-07-17 1998-01-22 Esselte Meto Int Gmbh Vorrichtung zum Deaktivieren eines Sicherungselementes für die elektronische Artikelsicherung
DE19734303B4 (de) * 1997-08-08 2005-09-22 Siemens Ag Magnetrad
CN105947293B (zh) * 2016-06-28 2018-07-20 横店集团东磁股份有限公司 一种适用于磁瓦包装的自动化生产线及其实现方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2958019A (en) * 1956-09-17 1960-10-25 Indiana General Corp Magnetic pad assembly
US3173066A (en) * 1961-06-22 1965-03-09 Gen Motors Corp Magnetic sealing strip
US3368275A (en) * 1962-07-03 1968-02-13 Syncro Corp Casting, machining, and assembling a magnetic motor ring structure

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE842817C (de) * 1950-04-23 1952-07-03 Deutsche Edelstahlwerke Ag Verfahren zur Herstellung von Magneten mit Eisenleitteilen
GB875807A (en) * 1957-02-09 1961-08-23 Baermann Max Improvements in or relating to permanent magnets
DE1251808B (de) * 1961-11-13 1967-10-12 AMP Incorporated, Harrisburg Pa (V St A) Verfahren zur Herstellung von Magnetkern Speicheranordnungen und Anordnung zur Ausfuhrung des Verfahrens

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2958019A (en) * 1956-09-17 1960-10-25 Indiana General Corp Magnetic pad assembly
US3173066A (en) * 1961-06-22 1965-03-09 Gen Motors Corp Magnetic sealing strip
US3368275A (en) * 1962-07-03 1968-02-13 Syncro Corp Casting, machining, and assembling a magnetic motor ring structure

Cited By (50)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4080542A (en) * 1974-04-08 1978-03-21 Photocircuits Division Of Kollmorgen Corporation High density flux magnetic circuit
US4002937A (en) * 1975-07-03 1977-01-11 Dickey-John Corporation Magnetic sensing device
US4451811A (en) * 1979-07-30 1984-05-29 Litton Systems, Inc. Magnet structure
US4645960A (en) * 1979-07-30 1987-02-24 Litton Systems, Inc. Ferro-fluid bearing
US4599826A (en) * 1984-03-05 1986-07-15 Institut Sverkhtverdykh Materialov Akademii Naukukrainskoi Ssr Device for magnetoabrasive machining of workpieces
US4834870A (en) * 1987-09-04 1989-05-30 Huron Valley Steel Corporation Method and apparatus for sorting non-ferrous metal pieces
US5320297A (en) * 1988-01-13 1994-06-14 Beloit Technologies, Inc. Roll-winding apparatus drive mechanism
US4869811A (en) * 1988-07-05 1989-09-26 Huron Valley Steel Corporation Rotor for magnetically sorting different metals
US4998034A (en) * 1988-10-05 1991-03-05 Hitachi, Ltd. Low speed high torque motor with production method
US5030344A (en) * 1989-07-24 1991-07-09 H.K. Research & Development, Inc. Magnetic fluid conditioner
WO1991001277A1 (en) * 1989-07-24 1991-02-07 H.K. Research & Development, Inc. Magnetic fluid conditioner
US5575485A (en) * 1991-11-25 1996-11-19 Industrie Ilpea S.P.A. Magnetic gasket suitable for forming a seal between a fixed part and an openable part
US5275292A (en) * 1992-05-18 1994-01-04 Brugger Richard D Eddy current separator
US5682670A (en) * 1992-07-16 1997-11-04 Magnet Applications Limited Method for the fabrication of multipole magnets
US5522513A (en) * 1994-03-30 1996-06-04 Howell; Billy R. Separator disc
WO1999038175A1 (de) * 1998-01-23 1999-07-29 Wampfler Aktiengesellschaft Ferritkern
US6983529B2 (en) 2001-02-23 2006-01-10 Black & Decker Inc. Stator assembly with an overmolding that secures magnets to a flux ring and the flux ring to a stator housing
US6903475B2 (en) 2001-02-23 2005-06-07 Black & Decker Inc. Stator assembly with an overmolding that secures magnets to a flux ring and the flux ring to a stator housing
US20050184610A1 (en) * 2001-02-23 2005-08-25 Michael Agnes Field assembly for a motor and method of making same
US20050189831A1 (en) * 2001-02-23 2005-09-01 Ortt Earl M. Stator assembly with an overmolding that secures magnets to a flux ring and the flux ring to a stator housing
US20050188528A1 (en) * 2001-02-23 2005-09-01 Ortt Earl M. Stator assembly with an overmolding that secures magnets to a flux ring and the flux ring to a stator housing
US20050194854A1 (en) * 2001-02-23 2005-09-08 Michael Agnes Field assembly for a motor and method of making same
US20040104636A1 (en) * 2001-02-23 2004-06-03 Ortt Earl M. Stator assembly with an overmolding that secures magnets to a flux ring and the flux ring to a stator housing
US7088024B2 (en) 2001-02-23 2006-08-08 Black & Decker Inc. Field assembly for a motor and method of making same
US7091642B2 (en) 2001-02-23 2006-08-15 Black & Decker Inc. Field assembly for a motor and method of making same
US7119469B2 (en) 2001-02-23 2006-10-10 Black & Decker Inc. Stator assembly with an overmolding that secures magnets to a flux ring and the flux ring to a stator housing
US20040113504A1 (en) * 2002-02-22 2004-06-17 Michael Agnes Field assembly for a motor and method of making same
US7038343B2 (en) 2002-02-22 2006-05-02 Black & Decker Inc. Field assembly for a motor and method of making same
US20050173995A1 (en) * 2004-01-10 2005-08-11 Lg Electronics Inc. Stator for reciprocating motor
US8248196B2 (en) * 2006-09-26 2012-08-21 Thyssenkrupp Transrapid Gmbh Magnet arrangement for magnetic levitation vehicles and method for the production thereof
US20100026433A1 (en) * 2006-09-26 2010-02-04 Peter Bugiel Magnet arrangement for magnetic levitation vehicles and method for the production thereof
EP2076954A4 (en) * 2006-10-13 2017-08-23 Black & Decker, Inc. Motor with permanent magnets and method of manufacturing; power tool with same
FR2910194A1 (fr) * 2006-12-15 2008-06-20 Valeo Equip Electr Moteur Machine electrique tournante, notamment pour demarreur de vehicule automobile
US8371021B2 (en) * 2008-05-23 2013-02-12 Panasonic Corporation Manufacturing method of rare earth-iron ring magnet with continuous orientation controlled anisotropy
US20100218365A1 (en) * 2008-05-23 2010-09-02 Panasonic Corporation Manufacturing method of rare earth-iron ring magnet with continuous orientation controlled anisotropy
US20100289348A1 (en) * 2009-05-18 2010-11-18 Compact Dynamics Gmbh Axial flow machine
US20200075209A1 (en) * 2010-05-16 2020-03-05 Gooper Hermetic Ltd. Flexible magnetic sealing apparatus
US9966174B2 (en) * 2010-05-16 2018-05-08 Gooper Hermetic Ltd. Flexible magnetic sealing apparatus
US20130061431A1 (en) * 2010-05-16 2013-03-14 Gooper Hermetic Ltd. Flexible magnetic sealing apparatus
US20180322992A1 (en) * 2010-05-16 2018-11-08 Gooper Hermetic Ltd. Flexible magnetic sealing apparatus
US20220172869A1 (en) * 2010-05-16 2022-06-02 Gooper Hermetic Ltd Flexible magnetic sealing apparatus
US10629349B2 (en) * 2010-05-16 2020-04-21 Gooper Hermeteic Ltd. Flexible magnetic sealing apparatus
US11600418B2 (en) * 2010-05-16 2023-03-07 Gooper Hermetic, Ltd. Flexible magnetic sealing apparatus
US11270823B2 (en) * 2010-05-16 2022-03-08 Gooper Hermetic Ltd Flexible magnetic sealing apparatus
US11677301B2 (en) * 2013-10-01 2023-06-13 Whirlpool Corporation Method of manufacturing a rotor for an electric motor for a washing machine
US20150089794A1 (en) * 2013-10-01 2015-04-02 Whirlpool Corporation Method of manufacturing a rotor for an electric motor for a washing machine
US10491087B2 (en) * 2013-10-01 2019-11-26 Whirlpool Corporation Method of manufacturing a rotor for an electric motor for a washing machine
US10008325B2 (en) * 2015-06-08 2018-06-26 Apple Inc. Thin magnet fabrication
US20160358703A1 (en) * 2015-06-08 2016-12-08 Apple Inc. Thin magnet fabrication
US10993505B1 (en) * 2019-08-29 2021-05-04 Frank Dale Boxberger Flexible magnetic fastening apparatus

Also Published As

Publication number Publication date
GB1354387A (en) 1974-06-05
DE2158571A1 (de) 1972-06-08
NL7115880A (xx) 1972-05-23
FR2114151A5 (xx) 1972-06-30
IT940645B (it) 1973-02-20

Similar Documents

Publication Publication Date Title
US3710291A (en) Permanent magnet
JP6517189B2 (ja) 弓形磁石片、永久磁石片、永久磁石組立体、永久磁石応用装置およびモータ
EP0479514B1 (en) Magnetic field generating device used for MRI
US5345669A (en) Method of making a permanent magnet rotor
CN1625826B (zh) 用于电机的转子
CN205159023U (zh) 磁铁单元
JP2004533113A (ja) 磁気保持装置
MY118088A (en) Method of manufacturing cores for rotary electric machines
EP0639292B1 (en) Magnetization of permanent magnet strip materials
JP2010172131A (ja) 回転電機
US3558947A (en) Discoidal wire wound armatures
US4459500A (en) Magnetic field pole assembly
US7638914B2 (en) Permanent magnet bonding construction
JP6907742B2 (ja) 磁石材の製造方法、モータの製造方法
JP2003527744A (ja) 単磁石部品の製造及びマガジン化方法並びに小型化した磁石系の製造のためのその組み立て及びその磁石系
EP2677631B1 (en) Cylindrical magnetic circuit and producing method thereof
CA1181476A (en) Permanent magnetic holding arrangement, particularly for temporary holding of ferro-magnetic parts
EP0092440A2 (en) Magnet roller
US3889220A (en) Stacked magnetic arrangement
US4529954A (en) Magnetizing apparatus for anisotropic permanent magnets
US3786386A (en) Magnetic anchoring device for graphic arts
WO2019238981A3 (en) Mould and method for manufacturing flux focusing permanent magnets comprising spread magnetic flux lines
EP3975387A1 (en) Rotor structure of synchronous motor
JP7381851B2 (ja) 円筒状ボンド磁石の製造方法、円筒状ボンド磁石成形用金型、および円筒状ボンド磁石
JPS629688Y2 (xx)