GB442849A - Improvements in inductance coils - Google Patents

Improvements in inductance coils

Info

Publication number
GB442849A
GB442849A GB1434734A GB1434734A GB442849A GB 442849 A GB442849 A GB 442849A GB 1434734 A GB1434734 A GB 1434734A GB 1434734 A GB1434734 A GB 1434734A GB 442849 A GB442849 A GB 442849A
Authority
GB
United Kingdom
Prior art keywords
core
coil
parts
box
stems
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
GB1434734A
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.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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 Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Priority to GB1434734A priority Critical patent/GB442849A/en
Publication of GB442849A publication Critical patent/GB442849A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H01F17/043—Fixed inductances of the signal type  with magnetic core with two, usually identical or nearly identical parts enclosing completely the coil (pot cores)

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Testing Electric Properties And Detecting Electric Faults (AREA)

Abstract

442,849. Inductances. TELEFONAKTIEBOLAGET L. M. ERICSSON, 33, Kungsgatan, Stockholm. May 11, 1934, No. 14347. Void [Abridged as open to inspection under Sect. 91 of the Acts, Nov. 19, 1934]. [Class 37] In inductance coils provided with a shell-type core, which may be moulded from compressed powdered magnetic material mixed with insulating material, the core surrounded coaxially by the coil winding is divided into two parts which have their ends so shaped that by relative rotation the reluctance of the core is varied. In the construction shown, the coil 3 is surrounded by a shell type core consisting of powdered magnetic material mixed with material known under the Registered Trade Mark "Bakelite." The core is divided into two parts 1, 2 forming a round box and lid, each part having a central cylindrical stem surrounded by the coil 3. The two stems have their meeting ends semicircular so that the area of the surface of contact is varied by rotating the lid 2 relatively to the box 1, thereby adjusting the inductance of the coil 3. The assembly is enclosed in a sheet metal box 5 with a cover 6, serving for electrostatic and electromagnetic shielding. A spring 9 presses the core parts 1, 2 together. A screw 7 engaging a semicircular slit in the cover 6 enables the core part 2 to be fixed when the desired adjustment has been made. The abutting surfaces of the core stems may be shaped to give any desired law of variation. The box 1 and cover 2 may be rigidly connected, one or both central stems being rotatable in relation to the core parts.
GB1434734A 1934-05-11 1934-05-11 Improvements in inductance coils Expired GB442849A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1434734A GB442849A (en) 1934-05-11 1934-05-11 Improvements in inductance coils

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1434734A GB442849A (en) 1934-05-11 1934-05-11 Improvements in inductance coils

Publications (1)

Publication Number Publication Date
GB442849A true GB442849A (en) 1936-02-17

Family

ID=10039546

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1434734A Expired GB442849A (en) 1934-05-11 1934-05-11 Improvements in inductance coils

Country Status (1)

Country Link
GB (1) GB442849A (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1005207B (en) * 1953-01-28 1957-03-28 Philips Patentverwaltung Magnetic circuit arrangement
DE1005206B (en) * 1953-01-28 1957-03-28 Philips Patentverwaltung Magnetic circuit arrangement
US2823359A (en) * 1954-06-01 1958-02-11 Rca Corp Miniature intermediate-frequency transformer
DE968916C (en) * 1952-05-09 1958-04-10 Steatite Res Corp Magnetic pot core for induction coils
US2836804A (en) * 1954-02-23 1958-05-27 Int Standard Electric Corp Inductors
US2873431A (en) * 1954-07-12 1959-02-10 Hallicrafters Co Variable inductor
DE973387C (en) * 1951-01-12 1960-02-04 Siemens Ag Pot core made of bulk or ferrite core material with an air gap in the center bar
US3162829A (en) * 1958-11-14 1964-12-22 Philips Corp Ferromagnetic pot-core assembles
US4728918A (en) * 1984-09-24 1988-03-01 Siemens Aktiengesellschaft Storage coil with air gap in core
US5347257A (en) * 1990-02-23 1994-09-13 Stocker & Yale, Inc. Varying inductances

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE973387C (en) * 1951-01-12 1960-02-04 Siemens Ag Pot core made of bulk or ferrite core material with an air gap in the center bar
DE968916C (en) * 1952-05-09 1958-04-10 Steatite Res Corp Magnetic pot core for induction coils
DE1005207B (en) * 1953-01-28 1957-03-28 Philips Patentverwaltung Magnetic circuit arrangement
DE1005206B (en) * 1953-01-28 1957-03-28 Philips Patentverwaltung Magnetic circuit arrangement
US2836804A (en) * 1954-02-23 1958-05-27 Int Standard Electric Corp Inductors
US2823359A (en) * 1954-06-01 1958-02-11 Rca Corp Miniature intermediate-frequency transformer
US2873431A (en) * 1954-07-12 1959-02-10 Hallicrafters Co Variable inductor
US3162829A (en) * 1958-11-14 1964-12-22 Philips Corp Ferromagnetic pot-core assembles
US4728918A (en) * 1984-09-24 1988-03-01 Siemens Aktiengesellschaft Storage coil with air gap in core
US5347257A (en) * 1990-02-23 1994-09-13 Stocker & Yale, Inc. Varying inductances

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