US3538601A - Method for the manufacture of laminated electromagnetic cores - Google Patents

Method for the manufacture of laminated electromagnetic cores Download PDF

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Publication number
US3538601A
US3538601A US730439A US3538601DA US3538601A US 3538601 A US3538601 A US 3538601A US 730439 A US730439 A US 730439A US 3538601D A US3538601D A US 3538601DA US 3538601 A US3538601 A US 3538601A
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US
United States
Prior art keywords
laminations
polar
electromagnet
manufacture
cores
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
US730439A
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English (en)
Inventor
Patrick J M Nerot
Claude P Vinot
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Telemecanique SA
Original Assignee
La Telemecanique Electrique SA
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Publication date
Application filed by La Telemecanique Electrique SA filed Critical La Telemecanique Electrique SA
Application granted granted Critical
Publication of US3538601A publication Critical patent/US3538601A/en
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Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/081—Magnetic constructions
    • 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
    • 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
    • Y10T29/49078—Laminated

Definitions

  • a method for the manufacture of an electromagnet core made of a movable and of a stationary part WhlCh comprises assembling punched laminations into two stacks to form the said parts, each defining a polar surface and truing only one of said polar surfaces, by grinding, the other polar surface remaining rough.
  • An electromagnet core formed of a movable and of a stationary part and made of laminations stacked into the said parts, each part defining a polar surface.
  • One of the polar surfaces is a polished surface whereas the other polar surface is defined by rough edges of the corresponding laminations.
  • the present invention relates to a method for the manufacture of laminated electromagnet cores and cores so obtained.
  • the present invention relates to a very simple method for manufacturing stationary or movable laminated cores usually used in alternating current ,electromagnets. These cores are made in magnetic laminations punched in the form of an E or an U, the said laminations being thereafter assembled in generally riveted stacks.
  • stationary or movable laminated cores usually used in alternating current ,electromagnets.
  • These cores are made in magnetic laminations punched in the form of an E or an U, the said laminations being thereafter assembled in generally riveted stacks.
  • many devices, such as relays or contactor,.one of these stacks forms the stationary portion and carries the magnetic coil that creates the magnetic flux on one of its branches whereas the other portion, called the armature, is movable in translation or in rotation of a relatively small angle.
  • One object of the manufacturing method of the invention lies in that it makes it possible to obtain still better results with simpler, and consequently, more economical means. It relates to a two-part electromagnet of which one part is movable in relation to the other, that obviates the sticking effect of the polar surfaces and with a very high manoeuvring possibility without deterioration of the said surfaces. It is applicable to all shapes of electromagnet cores but it is particularly efiicient for a magnetic core made of two branches such as those made with U-shaped laminations and provided with an antiresidual 4 air gap incorporated in the branches. This type of electromagnet is described and illustrated in U.S. Pat. N0. 1,518,020, issued Dec. 2, 1924.
  • the oil reserve between the laminations may be used as well as with E-shaped three-branch cores or U-shaped two-branch cores. In each case, there will be two cooperating polar surfaces narrowly joined since, if the core is U-shaped, there must be an incorporated air gap.
  • these joined surfaces are obtained by truing up the stack of assembled laminations by grinding.
  • the coexistence of these means: the oil film on the polar meeting surfaces and the same surfaces being trued up by grinding has drawbacks.
  • the oil film bursts and splashes on the external parts.
  • the flat polished surfaces have a tendency to stick to one another and prevent the reopening of the magnetic circuit. To obviate this, truing by grinding of the two parts of the core could obviously be totally omitted but the magnetic circuit would then vibrate and make a great noise when excited.
  • the laminations are degreased by immersion in a bath of liquid trichlorethylene at a temperature of 87 C., the immersion period being'about 20 minutes to obtain a weight of oil of 0.2 mmg./cm.
  • This figure is suitable for a small magnetic core of 76 g. such as used in relays.
  • the amount of oil may attain 0.5 mmg. per cm. the immersion period being then reduced. In every case, experimentation must be made and the amount of oil needed may vary from 0.1 to 0.5 mmg. per cm.
  • One of the stacks of laminations for instance that which constitutes the armature 1 of the electromagnet, may thereafter be assembled by any convenient means such as rivets 2. It is thereafter trued up by grinding to obtain perfectly fiat polar surfaces 3.
  • the polar surfaces 3 and 5 movable against one another are of different physical nature.
  • a surface 3 polished by the work of the millstone on the other hand, an irregular surface 5 formed of very small grooves 6 as illustrated in FIG. 2.
  • the parallel assembly of the punched laminations in the same working direction gives, on the edge of the stack of laminations, a series of narrow parallel surfaces separated by minute edgy groove 6; besides, these surfaces have been subjected to a certain hardening inherent to the cold working of the metal.
  • the groove '6 thus formed and that would disappear if they were trued up by grinding will thus serve to hold into position the oil film that comes from the reserve between the laminations. Furthermore, the cooperating polar surfaces 3 and 5 may no longer adhere as would two polished surfaces under atmospheric pressure. Finally, the voids corresponding to the grooves fin rea e ta c ..,th ma neti c rcu tthus proving the antiresidual effect.
  • a method of manufacturing a laminated electromagnet core comprising: punching metal laminations into a predetermined shape; spreading over the surface of the laminations a predetermined amount of oil which is proportional to the size of the laminations; assembling said punched laminations in parallel relationship into stacks to constitute two core portions defining rough polar surfaces while maintaining a common direction for the mounting of the stacked laminations with regard to the punching direction, truing up the rough polar surfaces of only one of said stacks by grinding, aligning the laminations of the other stack by ramming against its rough polar surface, and assembling said two core portions to form an electromagnet core having cooperating polar surfaces.
  • Amethod as defined in claim 1 including degreasing said laminations.
  • a method as defined in claim 2 wherein said degreasing includes immersing said laminations in a bath of liquid trichlorethylene.
  • a method as defined in claim 1 wherein said predetermined amount of oil spread over the surface is from 0.1 mmg./cm. to and including 0.5 mmg./cm.
  • a method as defined in claim 1 including forming minute grooves on said polar surfaces when said laminations are assembled in parallel relationship.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Electromagnets (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)
US730439A 1967-05-26 1968-05-20 Method for the manufacture of laminated electromagnetic cores Expired - Lifetime US3538601A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR107973A FR1532459A (fr) 1967-05-26 1967-05-26 Procédé pour construire des noyaux d'électro-aimant en tôles feuilletées et noyaux ainsi obtenus

Publications (1)

Publication Number Publication Date
US3538601A true US3538601A (en) 1970-11-10

Family

ID=8631686

Family Applications (1)

Application Number Title Priority Date Filing Date
US730439A Expired - Lifetime US3538601A (en) 1967-05-26 1968-05-20 Method for the manufacture of laminated electromagnetic cores

Country Status (11)

Country Link
US (1) US3538601A (OSRAM)
AT (1) AT284251B (OSRAM)
BE (1) BE714018A (OSRAM)
CH (1) CH488258A (OSRAM)
DE (2) DE1764271C3 (OSRAM)
DK (1) DK137298B (OSRAM)
FR (1) FR1532459A (OSRAM)
GB (1) GB1158859A (OSRAM)
LU (1) LU55958A1 (OSRAM)
NL (1) NL157736B (OSRAM)
SE (1) SE367887B (OSRAM)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4616204A (en) * 1982-08-09 1986-10-07 Allied Corporation Cut magnetic core formed of a glassy metal alloy
US4948656A (en) * 1987-04-27 1990-08-14 Armco Advanced Materials Corporation Laminate including sealing liquid between facing surfaces of laminations
US5176946A (en) * 1991-05-10 1993-01-05 Allen-Bradley Company, Inc. Laminated contactor core with blind hole
US6118366A (en) * 1997-12-09 2000-09-12 Siemens Automotive Corporation Electromagnetic actuator with split housing assembly
US20030151327A1 (en) * 2000-03-30 2003-08-14 Ramirez Rivio Arturo Process for forming the stack of metallic laminations for the stator of an eletric motor and the stack of metallic laminations
DE102006019206A1 (de) * 2006-04-21 2007-10-25 Windhorst Beteiligungsgesellschaft Mbh Verfahren, Anordnung und Spritzgusswerkzeug zum Verbinden eines thermoplastischen Magnetwerkstoffs mit einem nicht-magnetischen Trägerstoff
DE102017217433A1 (de) * 2017-09-29 2019-04-04 Siemens Aktiengesellschaft Jochbolzen
US10823305B2 (en) 2015-09-24 2020-11-03 Vitesco Technologies GmbH Laminated solenoid armature for an electromagnetic activation device and injection valve for metering a fluid

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD247297A1 (de) * 1986-03-31 1987-07-01 Pentacon Dresden Veb Haltemagnetsystem fuer fotografische kameras
US5443664A (en) * 1988-11-16 1995-08-22 Hitachi Metals, Ltd. Surge current-suppressing circuit and magnetic device therein

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1834898A (en) * 1930-05-21 1931-12-01 Gen Electric Magnetic core
US2541502A (en) * 1948-06-14 1951-02-13 Magnetic Metals Company Apparatus for coating thin stiff sheets
US2997633A (en) * 1958-05-13 1961-08-22 Westinghouse Electric Corp Electromagnetic actuated devices
US3058039A (en) * 1957-06-24 1962-10-09 Gen Controls Co Laminated magnetic structure, and process for making same

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE840285C (de) * 1951-01-28 1952-05-29 Kloeckner Moeller Verfahren zur Herstellung von Wechselstrommagneten
DE944071C (de) * 1953-06-12 1956-06-07 Siemens Ag Elektrisches Schaltrelais mit einem lamellierten Magneten und mit hohen Schaltzahlen, insbesondere elektrische Schuetze
DE1045546B (de) * 1954-09-14 1958-12-04 Licentia Gmbh Verfahren zur Herstellung eines genieteten Blechpakets fuer einen brummfreien Wechselstrommagneten
DE1884388U (de) * 1958-09-16 1963-12-12 Starkstrom Schaltegeraetefabri Wechselstrommagnet.
DE1160101B (de) * 1959-01-23 1963-12-27 Licentia Gmbh Elektromagnet mit Korrosionsschutz
CH407325A (de) * 1963-01-25 1966-02-15 Breitmeier Max Verfahren zur Herstellung eines lamellierten, magnetischen Kerns für elektrische Maschinen und Apparate und nach diesem Verfahren hergestellter, lamellierter magnetischer Kern
DE1258516B (de) * 1963-12-17 1968-01-11 Siemens Ag Magnetblock fuer Wechselstrommagnete mit weitgehender Unterdrueckung von Wirbelstroemen
DE1489669A1 (de) * 1964-12-23 1969-10-09 Asea Ab Verfahren zur Herstellung von Kernen und Ankern fuer Elektromagnete

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1834898A (en) * 1930-05-21 1931-12-01 Gen Electric Magnetic core
US2541502A (en) * 1948-06-14 1951-02-13 Magnetic Metals Company Apparatus for coating thin stiff sheets
US3058039A (en) * 1957-06-24 1962-10-09 Gen Controls Co Laminated magnetic structure, and process for making same
US2997633A (en) * 1958-05-13 1961-08-22 Westinghouse Electric Corp Electromagnetic actuated devices

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4616204A (en) * 1982-08-09 1986-10-07 Allied Corporation Cut magnetic core formed of a glassy metal alloy
US4948656A (en) * 1987-04-27 1990-08-14 Armco Advanced Materials Corporation Laminate including sealing liquid between facing surfaces of laminations
US5176946A (en) * 1991-05-10 1993-01-05 Allen-Bradley Company, Inc. Laminated contactor core with blind hole
US6118366A (en) * 1997-12-09 2000-09-12 Siemens Automotive Corporation Electromagnetic actuator with split housing assembly
US20030151327A1 (en) * 2000-03-30 2003-08-14 Ramirez Rivio Arturo Process for forming the stack of metallic laminations for the stator of an eletric motor and the stack of metallic laminations
DE102006019206A1 (de) * 2006-04-21 2007-10-25 Windhorst Beteiligungsgesellschaft Mbh Verfahren, Anordnung und Spritzgusswerkzeug zum Verbinden eines thermoplastischen Magnetwerkstoffs mit einem nicht-magnetischen Trägerstoff
DE102006019206B4 (de) * 2006-04-21 2009-04-09 Windhorst Beteiligungsgesellschaft Mbh Verfahren, Anordnung und Spritzgusswerkzeug zum Verbinden eines thermoplastischen Magnetwerkstoffs mit einem nicht-magnetischen Trägerstoff
US10823305B2 (en) 2015-09-24 2020-11-03 Vitesco Technologies GmbH Laminated solenoid armature for an electromagnetic activation device and injection valve for metering a fluid
DE102017217433A1 (de) * 2017-09-29 2019-04-04 Siemens Aktiengesellschaft Jochbolzen

Also Published As

Publication number Publication date
DE1764271C3 (de) 1982-11-18
NL157736B (nl) 1978-08-15
SE367887B (OSRAM) 1974-06-10
FR1532459A (fr) 1968-07-12
DK137298C (OSRAM) 1978-07-17
DE1764271A1 (de) 1972-04-06
BE714018A (OSRAM) 1968-09-16
DE1992600U (de) 1968-08-29
AT284251B (de) 1970-09-10
CH488258A (fr) 1970-03-31
GB1158859A (en) 1969-07-23
DK137298B (da) 1978-02-13
LU55958A1 (OSRAM) 1968-07-12
DE1764271B2 (de) 1973-03-22
NL6807152A (OSRAM) 1968-11-27

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