GB646464A - Improvements in or relating to electric chokes, transformers or the like having a variable reluctance - Google Patents

Improvements in or relating to electric chokes, transformers or the like having a variable reluctance

Info

Publication number
GB646464A
GB646464A GB811/48A GB81148A GB646464A GB 646464 A GB646464 A GB 646464A GB 811/48 A GB811/48 A GB 811/48A GB 81148 A GB81148 A GB 81148A GB 646464 A GB646464 A GB 646464A
Authority
GB
United Kingdom
Prior art keywords
limb
core
laminations
windings
winding
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
GB811/48A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB811/48A priority Critical patent/GB646464A/en
Priority to US69861A priority patent/US2602097A/en
Publication of GB646464A publication Critical patent/GB646464A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F29/00—Variable transformers or inductances not covered by group H01F21/00
    • H01F29/08—Variable transformers or inductances not covered by group H01F21/00 with core, coil, winding, or shield movable to offset variation of voltage or phase shift, e.g. induction regulators
    • H01F29/10—Variable transformers or inductances not covered by group H01F21/00 with core, coil, winding, or shield movable to offset variation of voltage or phase shift, e.g. induction regulators having movable part of magnetic circuit

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Of Transformers For General Uses (AREA)
  • Coils Or Transformers For Communication (AREA)

Abstract

646,464. Transformers and inductances. MULLER, H. Jan. 10, 1948, No. 811. [Class 38 (ii)] A variable reluctance electromagnetic aerial, e.g. a choke transformer, relay has a shell-type core in the frame of which a gap is provided in the form of a neck to embrace a movable central limb so as to provide a surface area for the air gap substantially larger than the crosssectional area of the core frame. Fig. 1 shows a choke core, one portion of which consists of two sets of laminations a<SP>1</SP>, a<SP>2</SP> and a centre movable limb c which slides through the neck formed by the ends of the laminations a<SP>1</SP>, a<SP>2</SP>. A fixed insulating tube f surrounds the limb c and carries winding g. By sliding the limb c, the reluctance of the air gap between its inner end and the fixed portion of the core may be varied. When the limb c is fully in, the length of the said air gap is determined by the thickness of the interposed insulator e and, in this position, the core has the same characteristics as that of a shell-type transformer. By providing a longitudinal cut in the limb c and an air gap b between the laminations a<SP>1</SP> and a<SP>2</SP>, the eddy currents are reduced. In a modification, instead of the winding being on the centre limb c, a pair of windings g<SP>1</SP> are mounted on the sides of the core part formed of laminations a<SP>1</SP>, a<SP>2</SP> so that as the centre limb c is withdrawn the fluxes of these two windings come into opposition progressively. In further modifications, the neck portion formed by the ends of the laminations a<SP>1</SP>, a<SP>2</SP> is turned inwardly or is in part inwardly and in part extended outwardly. In a further modification, the winding on the central limb c may be conical in shape. In a still further modification, a common central limb is arranged to slide in two identical core parts. The limb carries two windings, one at each end of the said limb. These windings are in series with their free ends connected across the supply lines and across one of the windings is connected a load circuit. The Provisional Specification also describes a modification in which the winding on the central limb may be in the form of a winding wider at each end than at the middle. Specification 600,842 is referred to in the Provisional Specification.
GB811/48A 1948-01-10 1948-01-10 Improvements in or relating to electric chokes, transformers or the like having a variable reluctance Expired GB646464A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB811/48A GB646464A (en) 1948-01-10 1948-01-10 Improvements in or relating to electric chokes, transformers or the like having a variable reluctance
US69861A US2602097A (en) 1948-01-10 1949-01-08 Variable electric chokes, transformers, or the like

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB811/48A GB646464A (en) 1948-01-10 1948-01-10 Improvements in or relating to electric chokes, transformers or the like having a variable reluctance

Publications (1)

Publication Number Publication Date
GB646464A true GB646464A (en) 1950-11-22

Family

ID=9710913

Family Applications (1)

Application Number Title Priority Date Filing Date
GB811/48A Expired GB646464A (en) 1948-01-10 1948-01-10 Improvements in or relating to electric chokes, transformers or the like having a variable reluctance

Country Status (2)

Country Link
US (1) US2602097A (en)
GB (1) GB646464A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1246110B (en) * 1958-06-26 1967-08-03 Emile Lekens Core for transformers and reactors
DE102005048544A1 (en) * 2005-10-11 2007-04-12 Robert Bosch Gmbh Magnetic circuit for ignition coil has outer core as strip placed round inner rod-like core with its thickness perpendicular to longitudinal direction of inner core

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1024166B (en) * 1954-09-07 1958-02-13 Siemens Reiniger Werke Ag Transformer with a laminated iron body
US2957149A (en) * 1957-02-25 1960-10-18 Elektroschaltgerate Grimma Veb Transformer
US3173117A (en) * 1961-05-31 1965-03-09 Bbc Brown Boveri & Cie Noise reducing arrangement for transformers
US3167708A (en) * 1962-07-12 1965-01-26 Pevar Maxwell Magnetic particle detection device having two separate movable electromagnets and aninterfitting bar member for magnetically coupling the cores of same
US3815067A (en) * 1972-08-04 1974-06-04 C Koh Chokes or reactors
LU67651A1 (en) * 1972-11-16 1973-07-26
GR1003555B (en) * 2000-01-14 2001-03-13 Ηλια Παναγιωτης Θεοφυλακτος Variable power tranformer of any voltage supply, steady current intensity and absolute accuracy

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1098549A (en) * 1911-05-15 1914-06-02 Cutler Hammer Mfg Co Transformer.
US1684746A (en) * 1926-03-31 1928-09-18 Benjamin H Smith Toy transformer
US1874806A (en) * 1931-02-28 1932-08-30 Westinghouse Electric & Mfg Co Transformer core
US2113603A (en) * 1931-05-07 1938-04-12 Johnson Lab Inc High-frequency inductance device
US2091842A (en) * 1936-05-02 1937-08-31 Gen Electric Induction voltage regulator
US2447002A (en) * 1945-04-28 1948-08-17 William R Faust Permeability tuned intermediate frequency transformer

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1246110B (en) * 1958-06-26 1967-08-03 Emile Lekens Core for transformers and reactors
DE102005048544A1 (en) * 2005-10-11 2007-04-12 Robert Bosch Gmbh Magnetic circuit for ignition coil has outer core as strip placed round inner rod-like core with its thickness perpendicular to longitudinal direction of inner core
US7508293B2 (en) 2005-10-11 2009-03-24 Robert Bosch Gmbh Magnetic circuit for ignition coils or transformers

Also Published As

Publication number Publication date
US2602097A (en) 1952-07-01

Similar Documents

Publication Publication Date Title
US2406045A (en) Inductance device
GB646464A (en) Improvements in or relating to electric chokes, transformers or the like having a variable reluctance
GB495370A (en) Improvements in or relating to three-phase transformers and three-phase choking coils
GB453762A (en) Improvements in electric transformers
US2558573A (en) Adjustable coupling system
GB462911A (en) Improvements in and relating to feeders and the like for electric currents of high frequency
GB617642A (en) Improvements in or relating to electrical transformers with regulating choke coils
GB1027685A (en) Improvements in and relating to inductive devices
GB693288A (en) Improvements in and relating to electric induction apparatus
GB1126049A (en) Improvements in or relating to electric choke coils
GB731500A (en) Improvements in and relating to magnetic cores
GB618114A (en) Improvements in and relating to magnetic cores
GB507755A (en) Improvements in or relating to polyphase transformers and polyphase choking coils
GB563692A (en) Improvements in or relating to inductance coils for use in radio circuits
GB615044A (en) Improvements in and relating to electric induction apparatus
GB624666A (en) Improvements relating to cores for electric transformers and chokes
GB592031A (en) Electric coupling circuit
GB643637A (en) Improvements in or relating to ballasts for use in the circuits of electric discharge lamps
GB687138A (en) Improvements relating to the variation of reactance in electrical induction apparatus
GB611132A (en) Improvements in and relating to radio-frequency inductors or transformers
GB573003A (en) High voltage transformers, particularly instrument transformers
GB649627A (en) Improvements in and relating to magnetic cores
GB717498A (en) Improvements in or relating to adjustable electric shell type inductive apparatus
GB769461A (en) Improvements in and relating to laminated core structures for electric induction apparatus
GB507559A (en) Improvements relating to electric chokes or voltage transformers