GB998332A - Improvements in electrical induction apparatus - Google Patents

Improvements in electrical induction apparatus

Info

Publication number
GB998332A
GB998332A GB12781/62A GB1278162A GB998332A GB 998332 A GB998332 A GB 998332A GB 12781/62 A GB12781/62 A GB 12781/62A GB 1278162 A GB1278162 A GB 1278162A GB 998332 A GB998332 A GB 998332A
Authority
GB
United Kingdom
Prior art keywords
grain
coating
bonded
silicon steel
those parts
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
GB12781/62A
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.)
General Electric Co
Original Assignee
General Electric Co
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 General Electric Co filed Critical General Electric Co
Publication of GB998332A publication Critical patent/GB998332A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • 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
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Dispersion Chemistry (AREA)
  • Electromagnetism (AREA)
  • Physics & Mathematics (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing Of Steel Electrode Plates (AREA)
  • Soft Magnetic Materials (AREA)

Abstract

The grain-oriented silicon steel laminations of the magnetic core of a transformer or dynamo have insulating coatings consisting essentially of beta calcium orthosilicate bonded to the surfaces of those parts only of the laminations in which the magnetic flux travels across the grain. A coating of magnesium silicate may be bonded to the surfaces of those parts in which the flux travels along the grain. The coating of beta calcium orthosilicate is formed by coating silicon steel sheets with a water slurry of calcium hydroxide and heating from about 900-1250 DEG C. for 2-8 hours. The coating is said to decrease the core loss and the magnetostriction. Two exemplary methods are described, details being given of the cross-grain magnetic properties of the lamination strips prepared thereby.
GB12781/62A 1961-04-17 1962-04-03 Improvements in electrical induction apparatus Expired GB998332A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US103226A US3169236A (en) 1961-04-17 1961-04-17 Magnetic core for electrical induction apparatus with reduced magnetic losses

Publications (1)

Publication Number Publication Date
GB998332A true GB998332A (en) 1965-07-14

Family

ID=22294047

Family Applications (1)

Application Number Title Priority Date Filing Date
GB12781/62A Expired GB998332A (en) 1961-04-17 1962-04-03 Improvements in electrical induction apparatus

Country Status (4)

Country Link
US (1) US3169236A (en)
BE (1) BE616533A (en)
DE (1) DE1288208B (en)
GB (1) GB998332A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4025379A (en) 1973-05-03 1977-05-24 Whetstone Clayton N Method of making laminated magnetic material

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3389006A (en) * 1964-05-18 1968-06-18 Armco Steel Corp Process for forming a refractory coating on silicon-iron stock
US8686824B2 (en) * 2010-09-16 2014-04-01 Mirus International Inc. Economical core design for electromagnetic devices

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2909741A (en) * 1959-10-20 Encased magnetic core impregnated
DE896830C (en) * 1941-05-20 1953-11-16 Vacuumschmelze Ag Process for isolating cores
US2904875A (en) * 1954-08-26 1959-09-22 Westinghouse Electric Corp Method of coating magnetic sheet material
US2966725A (en) * 1955-03-15 1961-01-03 David E Parker Magnetostrictive core production
US3029403A (en) * 1958-05-23 1962-04-10 Honeywell Regulator Co Magnetic core structures

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4025379A (en) 1973-05-03 1977-05-24 Whetstone Clayton N Method of making laminated magnetic material

Also Published As

Publication number Publication date
US3169236A (en) 1965-02-09
BE616533A (en) 1962-08-16
DE1288208B (en) 1969-01-30

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