GB735989A - Improvements in or relating to high frequency magnetic cores - Google Patents
Improvements in or relating to high frequency magnetic coresInfo
- Publication number
- GB735989A GB735989A GB26718/53A GB2671853A GB735989A GB 735989 A GB735989 A GB 735989A GB 26718/53 A GB26718/53 A GB 26718/53A GB 2671853 A GB2671853 A GB 2671853A GB 735989 A GB735989 A GB 735989A
- Authority
- GB
- United Kingdom
- Prior art keywords
- core
- stress
- magnetic
- ferrite
- magnetostriction
- 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
Links
- 229910000859 α-Fe Inorganic materials 0.000 abstract 5
- 238000004804 winding Methods 0.000 abstract 3
- 239000000203 mixture Substances 0.000 abstract 2
- 229910001369 Brass Inorganic materials 0.000 abstract 1
- 239000010951 brass Substances 0.000 abstract 1
- 238000005266 casting Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 abstract 1
- 230000035699 permeability Effects 0.000 abstract 1
- 229920000728 polyester Polymers 0.000 abstract 1
- 239000011347 resin Substances 0.000 abstract 1
- 229920005989 resin Polymers 0.000 abstract 1
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
- H01F41/0206—Manufacturing of magnetic cores by mechanical means
- H01F41/0246—Manufacturing of magnetic circuits by moulding or by pressing powder
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/26—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on ferrites
- C04B35/265—Compositions containing one or more ferrites of the group comprising manganese or zinc and one or more ferrites of the group comprising nickel, copper or cobalt
-
- 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
- H01F1/34—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 non-metallic substances, e.g. ferrites
- H01F1/342—Oxides
- H01F1/344—Ferrites, e.g. having a cubic spinel structure (X2+O)(Y23+O3), e.g. magnetite Fe3O4
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F17/00—Fixed inductances of the signal type
- H01F17/04—Fixed inductances of the signal type with magnetic core
Abstract
735,989. Magnetic compositions and structures. WESTERN ELECTRIC CO., Inc. Sept. 29, 1953 [Oct. 2, 1952], No. 26718/53. Class 38 (2). The magnetic properties of a ferrite core are changed by the continued application of stress, e.g. application of radial compressive stress on an annular core of Ni Zn ferrite increases the maximum permeability and retentivity so that the hysteresis loop becomes more nearly rectangular. The cores are particularly suitable for magnetic memory devices and magnetic amplifiers. The stress may be that developed in core 11 by the shrinking as it sets of the body 13, e.g. of styrene-polyester casting resin, in which it is embedded. The core may carry winding 12 or there may be a hole in the central plastic part through which the winding passes. The stress may be increased by passing a current through the winding during setting of the plastic whereby the core dimensions are altered by the propery of magnetostriction. Variable stress for testing its effects may be applied by controllable oil pressure in a rubber tube 25 encircling the core 21 and held in place in a bass casing 22 by a brass plug 23. The properties of stressed cores of Ni Zn ferrites of different compositions are tabulated and contrasted with those of Mn Zn ferrite. In general ferrites with negative magnetostriction should be compressed and those with positive magnetostriction placed in tension.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US312746A US2818514A (en) | 1952-10-02 | 1952-10-02 | Stressed ferrite cores |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB735989A true GB735989A (en) | 1955-08-31 |
Family
ID=23212832
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB26718/53A Expired GB735989A (en) | 1952-10-02 | 1953-09-29 | Improvements in or relating to high frequency magnetic cores |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US2818514A (en) |
| BE (1) | BE523180A (en) |
| CH (1) | CH324094A (en) |
| FR (1) | FR1080958A (en) |
| GB (1) | GB735989A (en) |
| NL (1) | NL84264C (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2997443A (en) * | 1955-03-03 | 1961-08-22 | Plessey Co Ltd | Modified nickel ferrite |
| US2996695A (en) * | 1955-12-06 | 1961-08-15 | Cgs Lab Inc | Controllable inductor |
| BE562891A (en) * | 1956-12-14 | |||
| US2955217A (en) * | 1957-03-06 | 1960-10-04 | Harris Transducer Corp | Transducer element |
| US2947890A (en) * | 1957-03-25 | 1960-08-02 | Harris Transducer Corp | Transducer |
| US3027526A (en) * | 1957-12-23 | 1962-03-27 | Burroughs Corp | Magnetic core assembly |
| US3079470A (en) * | 1959-12-21 | 1963-02-26 | Armour Res Found | Magnetic transducer head |
| US3351832A (en) * | 1967-02-01 | 1967-11-07 | Aerojet General Co | Article of manufacture and apparatus for producing ultrasonic power |
| US3484630A (en) * | 1967-12-11 | 1969-12-16 | Doall Co | Ultrasonic magnetostrictive transducer element |
| FR96356E (en) * | 1968-01-15 | 1972-06-16 | ||
| FR96237E (en) * | 1968-01-15 | 1972-05-19 | ||
| US7456714B2 (en) * | 2006-10-09 | 2008-11-25 | Igo, Inc. | Magnetostriction aided switching |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1326366A (en) * | 1913-02-07 | 1919-12-30 | Motor Ignition & Devices Company | Method of making electric coils. |
| US1876745A (en) * | 1927-08-26 | 1932-09-13 | Gen Cable Corp | Method of applying heat to the coverings of electrically conductive cores |
| US2317166A (en) * | 1939-08-15 | 1943-04-20 | Victor R Abrams | Pumping device |
| US2452530A (en) * | 1943-05-15 | 1948-10-26 | Hartford Nat Bank & Trust Co | Magnetic core |
| US2414525A (en) * | 1944-02-25 | 1947-01-21 | Westinghouse Electric Corp | Process of applying insulation |
| US2526688A (en) * | 1946-12-28 | 1950-10-24 | Sprague Electric Co | Process of producing electrical condensers |
| US2519277A (en) * | 1947-01-15 | 1950-08-15 | Bell Telephone Labor Inc | Magnetostrictive device and alloy and method of producing them |
| US2638567A (en) * | 1950-05-05 | 1953-05-12 | Eugene J Cronin | Magnetostriction apparatus |
-
0
- NL NL84264D patent/NL84264C/xx active
- BE BE523180D patent/BE523180A/xx unknown
-
1952
- 1952-10-02 US US312746A patent/US2818514A/en not_active Expired - Lifetime
-
1953
- 1953-06-23 FR FR1080958D patent/FR1080958A/en not_active Expired
- 1953-09-03 CH CH324094D patent/CH324094A/en unknown
- 1953-09-29 GB GB26718/53A patent/GB735989A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| NL84264C (en) | |
| US2818514A (en) | 1957-12-31 |
| BE523180A (en) | |
| FR1080958A (en) | 1954-12-15 |
| CH324094A (en) | 1957-08-31 |
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