US3819427A - Method of making an electromagnetic-sheet stack - Google Patents

Method of making an electromagnetic-sheet stack Download PDF

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Publication number
US3819427A
US3819427A US00264797A US26479772A US3819427A US 3819427 A US3819427 A US 3819427A US 00264797 A US00264797 A US 00264797A US 26479772 A US26479772 A US 26479772A US 3819427 A US3819427 A US 3819427A
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US
United States
Prior art keywords
sheets
stack
sheet
stamping
electromagnetic
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
US00264797A
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English (en)
Inventor
V Baesch
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.)
Ludwig-Ofag-Indugas Ind GmbH
Original Assignee
Ludwig-Ofag-Indugas Ind GmbH
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Publication of US3819427A publication Critical patent/US3819427A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
    • H01F1/147—Alloys characterised by their composition
    • H01F1/14766—Fe-Si based alloys
    • H01F1/14775—Fe-Si based alloys in the form of sheets
    • H01F1/14783—Fe-Si based alloys in the form of sheets with insulating coating
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/24—Magnetic cores
    • H01F27/245—Magnetic cores made from sheets, e.g. grain-oriented
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/341—Preventing or reducing no-load losses or reactive currents
    • 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
    • H01F41/0206—Manufacturing of magnetic cores by mechanical means
    • H01F41/0233—Manufacturing of magnetic circuits made from sheets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/04—Details of the magnetic circuit characterised by the material used for insulating the magnetic circuit or parts thereof

Definitions

  • the present invention relates to a method of making a sheet stack for use with an electromagnetic coil.
  • the field or stator element of a motor, transformer, choke, meter movement, relay, magnetic-field detector or the like is usually formed from a multiplicity of similar laminations or sheets produced by stamping. These sheets are secured together in a stack by weldment beads, spot welds, straps or by means of rivets or bolts, after which the assembled stack is submitted to a heattreatment operation (annealing) which improves its magnetic properties.
  • Another object of my invention is to provide an improved method of making such a stack.
  • Yet another object of the invention is to provide a method of making an improved sheet stack wherein the electromagnetic properties of the finished product are excellent.
  • the thin sheets or lamella of sheet iron, sheet steel or a steel-alloy sheet of silicon steel are stamped or punched from a larger sheet and are geometrically identical, the sheets being stacked in coextensive relationship after the application of an inert antibonding spacing substance uniformly to the surfaces of the sheets.
  • the stack which is mechanically fixed in the final configuration of the magnetic body by rivets, bolts, weld seams, clamps or straps, is then annealed in an oxidizing atmosphere at a temperature and for a period sufficient to cause oxide layers to form on the spacedly juxtaposed surfaces of the adjoining sheets, the spacing material permitting the oxidizing furnace gases to pass between the sheets.
  • the spacing layer is sufficiently porous to allow access to the metal surfaces of the oxidizing furnace gases so that the oxidation of the sheets is effected continuously and uniformly in spite of the presence of the spacer particles.
  • the latter are, as noted, chemically inert and physically inert with respect to the composition of the plate and the heat treatment.
  • the silicon dioxide or talc powder does not bond to the metal surfaces or to the oxide layers formed thereon, nor does it chemically react with either the furnace gases or the metals.
  • the oxide layers which are produced in situ in the furnace, form the permanent insulating and isolating layers without bonding of portions of the sheets together as has hitherto interfered with the uniformity of oxidation.
  • the furnace atmosphere, annealing temperatures, depth of the formed oxide layer may conform to the state of the art and I may mention German published Application No. 1,433,744 in this regard.
  • sheet is used herein in the sense of the art, namely, to define generally C-shaped, E-shaped, D-shaped, T-shaped and I-shaped thin magnetic members which are joined together in stacks to form stators for electrodynamic devices or the cores of such devices as chokes, transformers and induction coils.
  • the inhibitor is applied to the sheets as a finely divided aerosol powder.
  • the hot gas of the furnace penetrates between the sheets to thoroughly decarburize the sheets even at their centers and otherwise ensure uniform heating.
  • FIG. 1 is a perspective view of a stack according to the present invention
  • FIG. 2 is a section taken along line 11-11 of FIG. 1 drawn to a greatly enlarged scale
  • FIG. 3 is a largely diagrammatic view illustrating the method according to the present invention.
  • FIGS. 1 and 2 show a sheet stack 4 formed of a plurality of identical sheets I held together by rivets 5. Each sheet 1 is separated from the neighboring sheet 1 by a layer of inhibitor 3 enabling oxide coatings 2 to form on the confronting faces of the sheets 1. In this manner each sheet 1 is effectively insulated from the other sheets so that losses due to eddy currents are held to a minimum.
  • such a stack is produced by first stamping out the elements 1 from a sheet 6 at a stamping station 7. Oil mixed with the inhibitor 3 in powdered form is fed to the stamping device from a supply 8.
  • the temperature to which the stack 4 need be heated and the rate at which it should be cooled depend on just what magnetic properties are supposed to be imparted to it. This temperature need merely be sufficient, for
  • the present purposes to form the coatings 2 as, for example, vitreous or glass-like layers of microscopic thickness; the temperature should also be below that at which the applied spacing layer is broken down.
  • the inhibitor is, as stated above, a very finely divided powder which does not react with the sheets 1.
  • the following products have utility as inhibitors according to the present invention, silicon dioxide (particularly with silicon-steel alloys); metallic soaps, talc, and other heat-resistant fine powders. As described above these powders may be mixed with the stamping oil, or they may be blown over the stamped sheets, or both methods may be combined.
  • the sheets 1 themselves may be made of magnet steel, soft iron, a silicon-steel alloy, or the like, as well known in the transformer art.
  • the stack 4 of silicon-steel sheets is exposed to oxidizing gases at the annealing temperature to form the oxide layers 2 along the spacedly juxtaposed surfaces of the sheets.
  • the spacing between the sheets can be of the order of 1 to microns and will, of course, depend upon the layer of the particles introduced at 3 as the spacing layer.
  • stamping oil serves as the medium for coating the surfaces of the sheets with the spacing material, it is preferred to use a stamping oil which is decomposed in the annealing furnace or evaporates prior to annealing.
  • the oxide layers may have thicknesses of the order of microns and are found to be highly satisfactory as insulating layers between the sheets.
  • the steel-sheet material may consist of 30 to 40 percent by weight cobalt, l to 24 percent by weight silicon, 0 to 3 percent by weight chromium, 0.4 to 0.8 percent by weight carbon, 0 to 9 percent by weight tungsten, the balance iron.
  • Example II The process described in Example I is carried out except that thelayer, composed of talc, is applied in the stamping lubricant which is evaporated in the annealing oven during the initial phases of the treatment.
  • thelayer composed of talc
  • stamping lubricant which is evaporated in the annealing oven during the initial phases of the treatment.
  • stable oxide layers of a thickness of 1 to 10 microns are formed uniformly on the spacedly juxtaposed surfaces of the sheets.
  • a method of making an electromagnetic sheet stack 'for cooperation with an electromagnetic coil comprising the steps of:
  • stamping a multiplicity of ferromagnetic congruent sheets from a larger plate and coating said sheets with a film of oil and talc constituting a bond inhibitor in the stamping process

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)
  • Soft Magnetic Materials (AREA)
  • Manufacture Of Motors, Generators (AREA)
  • Manufacturing Of Steel Electrode Plates (AREA)
US00264797A 1971-09-11 1972-06-21 Method of making an electromagnetic-sheet stack Expired - Lifetime US3819427A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2145553A DE2145553C3 (de) 1971-09-11 1971-09-11 Verfahren zur Herstellung von Blechpaketen für die feldführenden TeUe elektrischer Maschinen und Geräte

Publications (1)

Publication Number Publication Date
US3819427A true US3819427A (en) 1974-06-25

Family

ID=5819323

Family Applications (1)

Application Number Title Priority Date Filing Date
US00264797A Expired - Lifetime US3819427A (en) 1971-09-11 1972-06-21 Method of making an electromagnetic-sheet stack

Country Status (14)

Country Link
US (1) US3819427A (fr)
JP (1) JPS5144721B2 (fr)
AT (1) AT313419B (fr)
BE (1) BE782242A (fr)
CS (1) CS171270B2 (fr)
DD (1) DD97783A5 (fr)
DE (1) DE2145553C3 (fr)
FR (1) FR2152511B1 (fr)
GB (1) GB1336109A (fr)
HU (1) HU162998B (fr)
NL (1) NL7208881A (fr)
PL (1) PL75666B1 (fr)
RO (1) RO64388A (fr)
SE (1) SE378020B (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4113530A (en) * 1974-04-23 1978-09-12 Kawasaki Steel Corporation Method for forming a heat-resistant insulating film on a grain oriented silicon steel sheet
FR2414816A1 (fr) * 1978-01-11 1979-08-10 Citroen Sa Perfectionnements apportes aux moteurs electriques alimentes par un courant hache
US4206004A (en) * 1971-10-11 1980-06-03 Kawasaki Steel Corporation Process of pretreating cold-rolled steel sheet for annealing
US4682126A (en) * 1984-06-01 1987-07-21 The United States Of America As Represented By The Secretary Of The Air Force Electromagnet for programmable microwave circulator
US4882834A (en) * 1987-04-27 1989-11-28 Armco Advanced Materials Corporation Forming a laminate by applying pressure to remove excess sealing liquid between facing surfaces laminations
US5018267A (en) * 1989-09-05 1991-05-28 Armco Inc. Method of forming a laminate
ES2127078A1 (es) * 1994-10-17 1999-04-01 Aeg Zahler Gmbh Paquete para nucleo de laminas de chapa superpuestas.
CN102832761A (zh) * 2012-09-18 2012-12-19 哈尔滨电机厂有限责任公司 定子铁心边段硅钢片叠片粘结成一体的制备方法
CN103474294A (zh) * 2013-09-18 2013-12-25 湖州友邦电器有限公司 一种接触器铁芯的制造方法
CN114123675A (zh) * 2020-08-31 2022-03-01 西门子股份公司 用于制造电机的方法以及设备和车辆

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS509139B1 (fr) * 1970-09-09 1975-04-10
JPS4940730A (fr) * 1972-08-22 1974-04-16
JPS5327929B2 (fr) * 1972-08-22 1978-08-11
JPS5263725A (en) * 1975-11-21 1977-05-26 Yashica Co Ltd Shutter control circuit
ES460709A1 (es) * 1976-08-11 1978-11-16 Gen Electric Un metodo para formar un nucleo de estator aglomerado.
JPS5423526A (en) * 1977-07-23 1979-02-22 Ricoh Co Ltd Automatic electronic shutter circuit
DE3110339C2 (de) * 1981-03-17 1984-09-27 Thyssen Industrie Ag, 4300 Essen Verfahren zum Herstellen eines Blechpakets für einen Langstator-Linearmotor
JPS63202009A (ja) * 1987-02-18 1988-08-22 Nakano Paamaroi Kk コアの製造方法
JPH04236149A (ja) * 1991-01-14 1992-08-25 Fanuc Ltd 電動機のステータ構造

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2354123A (en) * 1941-08-16 1944-07-18 Westinghouse Electric & Mfg Co Insulation for silicon irons
US2484242A (en) * 1946-04-03 1949-10-11 Westinghouse Electric Corp Coating ferrous metal sheets with an insulating film
US3076160A (en) * 1960-01-11 1963-01-29 Gen Electric Magnetic core material
US3189483A (en) * 1954-08-26 1965-06-15 Westinghouse Electric Corp Coatings for magnetic sheet material
US3240638A (en) * 1964-10-21 1966-03-15 Westinghouse Electric Corp Use of silicon steel alloy having a critical sulfur range to insure cube-onface orientation
US3523881A (en) * 1966-09-01 1970-08-11 Gen Electric Insulating coating and method of making the same
US3562029A (en) * 1968-04-18 1971-02-09 Allegheny Ludlum Steel Processing of fibrous magnesium silicate coated silicon steel

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2354123A (en) * 1941-08-16 1944-07-18 Westinghouse Electric & Mfg Co Insulation for silicon irons
US2484242A (en) * 1946-04-03 1949-10-11 Westinghouse Electric Corp Coating ferrous metal sheets with an insulating film
US3189483A (en) * 1954-08-26 1965-06-15 Westinghouse Electric Corp Coatings for magnetic sheet material
US3076160A (en) * 1960-01-11 1963-01-29 Gen Electric Magnetic core material
US3240638A (en) * 1964-10-21 1966-03-15 Westinghouse Electric Corp Use of silicon steel alloy having a critical sulfur range to insure cube-onface orientation
US3523881A (en) * 1966-09-01 1970-08-11 Gen Electric Insulating coating and method of making the same
US3562029A (en) * 1968-04-18 1971-02-09 Allegheny Ludlum Steel Processing of fibrous magnesium silicate coated silicon steel

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4206004A (en) * 1971-10-11 1980-06-03 Kawasaki Steel Corporation Process of pretreating cold-rolled steel sheet for annealing
US4113530A (en) * 1974-04-23 1978-09-12 Kawasaki Steel Corporation Method for forming a heat-resistant insulating film on a grain oriented silicon steel sheet
FR2414816A1 (fr) * 1978-01-11 1979-08-10 Citroen Sa Perfectionnements apportes aux moteurs electriques alimentes par un courant hache
US4209720A (en) * 1978-01-11 1980-06-24 Societe Anonyme Automobiles Citroen Electric motors supplied with chopped current
US4682126A (en) * 1984-06-01 1987-07-21 The United States Of America As Represented By The Secretary Of The Air Force Electromagnet for programmable microwave circulator
US4948656A (en) * 1987-04-27 1990-08-14 Armco Advanced Materials Corporation Laminate including sealing liquid between facing surfaces of laminations
US4882834A (en) * 1987-04-27 1989-11-28 Armco Advanced Materials Corporation Forming a laminate by applying pressure to remove excess sealing liquid between facing surfaces laminations
US5018267A (en) * 1989-09-05 1991-05-28 Armco Inc. Method of forming a laminate
US5116686A (en) * 1989-09-05 1992-05-26 Armco Inc. Method of forming a laminate and the product thereof a laminate including a sealing agent and a bonding agent
ES2127078A1 (es) * 1994-10-17 1999-04-01 Aeg Zahler Gmbh Paquete para nucleo de laminas de chapa superpuestas.
CN102832761A (zh) * 2012-09-18 2012-12-19 哈尔滨电机厂有限责任公司 定子铁心边段硅钢片叠片粘结成一体的制备方法
CN103474294A (zh) * 2013-09-18 2013-12-25 湖州友邦电器有限公司 一种接触器铁芯的制造方法
CN103474294B (zh) * 2013-09-18 2016-02-17 湖州友邦电器有限公司 一种接触器铁芯的制造方法
CN114123675A (zh) * 2020-08-31 2022-03-01 西门子股份公司 用于制造电机的方法以及设备和车辆

Also Published As

Publication number Publication date
JPS5144721B2 (fr) 1976-11-30
PL75666B1 (fr) 1974-12-31
NL7208881A (fr) 1973-03-13
GB1336109A (en) 1973-11-07
HU162998B (fr) 1973-05-28
FR2152511A1 (fr) 1973-04-27
JPS4837605A (fr) 1973-06-02
CS171270B2 (fr) 1976-10-29
FR2152511B1 (fr) 1974-12-13
DE2145553B2 (de) 1974-08-22
DD97783A5 (fr) 1973-05-12
AT313419B (de) 1974-02-25
DE2145553A1 (de) 1973-03-22
SE378020B (fr) 1975-08-11
DE2145553C3 (de) 1979-07-19
RO64388A (fr) 1979-03-15
BE782242A (fr) 1972-08-16

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