US3303449A - Toroidal magnetic cores having varying cross-sectional areas - Google Patents

Toroidal magnetic cores having varying cross-sectional areas Download PDF

Info

Publication number
US3303449A
US3303449A US354493A US35449364A US3303449A US 3303449 A US3303449 A US 3303449A US 354493 A US354493 A US 354493A US 35449364 A US35449364 A US 35449364A US 3303449 A US3303449 A US 3303449A
Authority
US
United States
Prior art keywords
core
cross
sectional areas
magnetic cores
sectional
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
US354493A
Inventor
Stimler Morton
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 US354493A priority Critical patent/US3303449A/en
Application granted granted Critical
Publication of US3303449A publication Critical patent/US3303449A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • H01F17/06—Fixed inductances of the signal type  with magnetic core with core substantially closed in itself, e.g. toroid
    • H01F17/062—Toroidal core with turns of coil around it
    • 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
    • H01F41/0213—Manufacturing of magnetic circuits made from strip(s) or ribbon(s)

Definitions

  • This invention relates to magnetic cores and more particularly to magnetic cores adapted for progressive saturation.
  • magnetic cores having tapering non-uniform cross-sectional areas are provided which may be progressively saturated.
  • Toroidal cores having varying cross-sectional areas are provided by making the cores of varying thickness or by locating the hole within the toroid in an eccentric position.
  • An object of this invention is to provide a magnetic core having a non-uniform cross-sectional area.
  • a further object of this invention is to provide a toroidal magnetic core having a non-uniform cross-sectional area.
  • a still further object of this invention is to provide a toroidal powdered iron core having a gradually changing cross-sectional area throughout the length thereof.
  • Yet another object of this invention is to provide a toroidal laminated magnetic core having a non-uniform cross-sectional area.
  • Still another object is to provide a wound magnetic closed core having a non-uniform cross-sectional area.
  • FIG. 1 is a view of a circular powdered iron magnetic core
  • FIG. 2 is a sectional view taken along the line 22 of the core of FIG. 1;
  • FIG. 3 is a view of a powdered iron core having a tapering thickness
  • FIG. 4 is a sectional view taken along line 44 of FIG. 3;
  • FIG. 5 is a laminated ferromagnetic core according to an alternative form of the invention.
  • FIG. 6 is a sectional view taken through the line 6-6 of FIG. 5;
  • FIG. 7 is a view of a laminated ferromagnetic core having tapered laminations
  • FIG. 8 is a sectional view taken along line 88 of the core of FIG. 7;
  • FIG. 9 is a view of a tape wound core of progressively changing thickness
  • FIG. 10 is a sectional view taken along the line 1010 of the core of FIG. 9;
  • FIG. 11 is a developed layout of the tape used in making the core of FIG. 9.
  • FIG. 12 illustrates a tape wound core having laminations inserted between the layers of the magnetic tape.
  • a powdered magnetic core 11 having a hole within the core 11 eccentrically located to provide a core having a cross-sectional area varying from a minimum at portion 13 to a maximum at portion 15 with progressively increasing cross-sectional areas therebetween.
  • the thickness of core 11 is uniform as indicated in FIG. 2.
  • core 17 has a tapered cross-section providing for a maximum cross-sectional area of core material at 19 and a minimum cross-sectional area at 21 with varying intermediate cross-sectional areas therebetween.
  • core 23 is made up of laminations 25 each having a uniform thickness throughout. Unequal cross-sectional core areas are provided by the eccentric location of the hole therein.
  • a core 27 is made up of laminations 29 which have a tapering thickness assembled to provide unequal cross-sectional areas as illustrated.
  • core 31 is a wound core made fro-m a preformed tape 33 as shown in FIG. 11.
  • the wider portions will be substantially aligned with each other to form a large cross-sectional area of the core and the narrow portions will be substantially aligned with each other to form a small or minimum cross-sectional area portion of the core.
  • a core 35 is made up of convolutions of tape 37 having constant width and thickness. Unequal cross-sectional areas are provided by strips 39, 41, 43, and 47 of magnetic material which are disposed between successive layers of tape 37.
  • a winding or windings may be added to the cores illustrated to effect the desired progressive saturation thereof.
  • a saturable core adapted for progressive magnetic saturation comprising a generally toroidal shaped tape wound core formed from several layers of a ferrous tape material, a plurality of arcuate tapered laminations of ferrous material aligned in a radial sector and disposed between the layers of said tape material, whereby said core will have cross-sectional areas which progressively vary in magnitude from a minimum to a miximum to a minimum throughout one circumferential revolution of the core, said core having a single hole formed therein, said hole being circular and eccentrically disposed within the core.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Coils Or Transformers For Communication (AREA)

Description

. M. STIMLER TOROIDAL MAGNETIC CORES HAVING VARYING Feb. 7, 1967 CROS S SECTIONAL AREAS Original Filed Feb. 28, 1962 FHLH.
INVENTOR. MORTON STIMLER United States Patent 3 303,449 T OROIDAL MAGNETFC CORES HAVING VARYING CROSS-SECTIONAL AREAS Morton Stimler, Hyattsville, Md, assignor to the United States of America as represented by the Secretary of the Navy Original application Feb. 28, 1962, Ser. No. 176,458. Divided and this application Feb. 28, 1964, Ser. No.
1 Claim. c1. 3ss 21s The invention described herein may be manufactured and used by or for the Government of the United States of America for governmental purposes without the payment of any royalties thereon or therefor.
This application is a division of my copending application, Ser. No. 176,458, filed February 28, 1962 and now abandoned.
This invention relates to magnetic cores and more particularly to magnetic cores adapted for progressive saturation.
With the use of progressive saturation techniques, the need has arisen for magnetic core structures which provide increasing cross-sectional areas along the lengths thereof. In this invention magnetic cores having tapering non-uniform cross-sectional areas are provided which may be progressively saturated. Toroidal cores having varying cross-sectional areas are provided by making the cores of varying thickness or by locating the hole within the toroid in an eccentric position.
An object of this invention is to provide a magnetic core having a non-uniform cross-sectional area.
A further object of this invention is to provide a toroidal magnetic core having a non-uniform cross-sectional area.
A still further object of this invention is to provide a toroidal powdered iron core having a gradually changing cross-sectional area throughout the length thereof.
Yet another object of this invention is to provide a toroidal laminated magnetic core having a non-uniform cross-sectional area.
Still another object is to provide a wound magnetic closed core having a non-uniform cross-sectional area.
Other objects and many attendant advantages of this invention will be readily appreciated as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawing in which like reference numerals designate like parts throughout the figures thereof and wherein:
FIG. 1 is a view of a circular powdered iron magnetic core;
FIG. 2 is a sectional view taken along the line 22 of the core of FIG. 1;
FIG. 3 is a view of a powdered iron core having a tapering thickness;
FIG. 4 is a sectional view taken along line 44 of FIG. 3;
FIG. 5 is a laminated ferromagnetic core according to an alternative form of the invention;
FIG. 6 is a sectional view taken through the line 6-6 of FIG. 5;
FIG. 7 is a view of a laminated ferromagnetic core having tapered laminations;
FIG. 8 is a sectional view taken along line 88 of the core of FIG. 7;
FIG. 9 is a view of a tape wound core of progressively changing thickness;
FIG. 10 is a sectional view taken along the line 1010 of the core of FIG. 9;
FIG. 11 is a developed layout of the tape used in making the core of FIG. 9; and
FIG. 12 illustrates a tape wound core having laminations inserted between the layers of the magnetic tape.
3,303,449 Patented Feb. 7, I967 Referring now to FIGS. 1 and 2 of the drawing, a powdered magnetic core 11 is shown having a hole within the core 11 eccentrically located to provide a core having a cross-sectional area varying from a minimum at portion 13 to a maximum at portion 15 with progressively increasing cross-sectional areas therebetween. The thickness of core 11 is uniform as indicated in FIG. 2.
Referring now to FIGS. 3 and 4 of the drawing illustrating a powdered magnetic core 17 having a hole concentrically disposed within core 17. In FIG. 4 it may be seen that core 17 has a tapered cross-section providing for a maximum cross-sectional area of core material at 19 and a minimum cross-sectional area at 21 with varying intermediate cross-sectional areas therebetween.
Referring now to FIGS. 5 and 6 of the drawing, core 23 is made up of laminations 25 each having a uniform thickness throughout. Unequal cross-sectional core areas are provided by the eccentric location of the hole therein.
Referring now to FIGS. 7 and 8 of the drawings, a core 27 is made up of laminations 29 which have a tapering thickness assembled to provide unequal cross-sectional areas as illustrated.
Referring now to FIGS. 9, l0 and 11, core 31 is a wound core made fro-m a preformed tape 33 as shown in FIG. 11. With this type of core, the wider portions will be substantially aligned with each other to form a large cross-sectional area of the core and the narrow portions will be substantially aligned with each other to form a small or minimum cross-sectional area portion of the core.
Referring now to FIG. 12 of the drawing, a core 35 is made up of convolutions of tape 37 having constant width and thickness. Unequal cross-sectional areas are provided by strips 39, 41, 43, and 47 of magnetic material which are disposed between successive layers of tape 37.
In operation a winding or windings, not shown, may be added to the cores illustrated to effect the desired progressive saturation thereof.
Obviously many modifications and variations of the present invention are possible in the light of the above teachings. It is therefore to be understood, that within the scope of the appended claim, the invention may be practiced otherwise than as specifically described.
What is claimed as new and desired to be secured by Letters Patent of the United States is:
A saturable core adapted for progressive magnetic saturation comprising a generally toroidal shaped tape wound core formed from several layers of a ferrous tape material, a plurality of arcuate tapered laminations of ferrous material aligned in a radial sector and disposed between the layers of said tape material, whereby said core will have cross-sectional areas which progressively vary in magnitude from a minimum to a miximum to a minimum throughout one circumferential revolution of the core, said core having a single hole formed therein, said hole being circular and eccentrically disposed within the core.
References Cited by the Examiner UNITED STATES PATENTS 1,774,856 9/1930 Van Deventer 336-233 X 1,875,590 9/1932 Green 336 X 2,799,822 7/1957 Dewitz 336229 X 2,918,660 12/1959 Chen et al. 340-174 3,157,866 11/1964 Lien 340174 FOREIGN PATENTS 1,100,710 4/ 1955 France.
LEWIS H. MYERS, Primary Examiner.
J. F. BURNS, L. E. ASKIN, R. K. SCHA'EFER, W. M.
ASBURY, C. TORRES, A ssistanl Examiners.
US354493A 1962-02-28 1964-02-28 Toroidal magnetic cores having varying cross-sectional areas Expired - Lifetime US3303449A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US354493A US3303449A (en) 1962-02-28 1964-02-28 Toroidal magnetic cores having varying cross-sectional areas

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US17645862A 1962-02-28 1962-02-28
US354493A US3303449A (en) 1962-02-28 1964-02-28 Toroidal magnetic cores having varying cross-sectional areas

Publications (1)

Publication Number Publication Date
US3303449A true US3303449A (en) 1967-02-07

Family

ID=26872252

Family Applications (1)

Application Number Title Priority Date Filing Date
US354493A Expired - Lifetime US3303449A (en) 1962-02-28 1964-02-28 Toroidal magnetic cores having varying cross-sectional areas

Country Status (1)

Country Link
US (1) US3303449A (en)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3451047A (en) * 1963-08-30 1969-06-17 Ibm Eccentric magnetic core
US3497949A (en) * 1966-08-08 1970-03-03 Lucas Industries Ltd Method of making laminated cores
US3740674A (en) * 1972-01-06 1973-06-19 Us Navy Scroll transducer
EP0033441A1 (en) * 1980-02-01 1981-08-12 Hasler AG Pulse transformer and its use as isolation transformer
US4370296A (en) * 1978-03-21 1983-01-25 Fdx Associates, L.P. Toroidal fusion reactor having ohmic heating coil substantially adjacent toroidal fusion region
US4504813A (en) * 1982-12-03 1985-03-12 Mcgraw-Edison Company Energy saving wound core transformer
US4760484A (en) * 1986-12-18 1988-07-26 Honeywell, Inc. Protective inductive devices with increased ability to absord volt-seconds in an electrical conductor
US4845986A (en) * 1985-08-14 1989-07-11 Toyoda Gosei Co., Ltd. Liquid level indication device
US4853292A (en) * 1988-04-25 1989-08-01 Allied-Signal Inc. Stacked lamination magnetic cores
DE3921548A1 (en) * 1989-06-30 1991-01-10 Waasner Elektrotechnische Fabr SHEET PACKAGE FROM EDGE STRIP TAPE SHEETS AND METHOD FOR THE PRODUCTION THEREOF
EP0497219A2 (en) * 1991-01-28 1992-08-05 Powercube Corporation Integrated magnetic power converter core
US5270648A (en) * 1990-08-10 1993-12-14 Watson Industries, Inc. Single core triaxial flux-gate magnetometer
US5329269A (en) * 1990-08-10 1994-07-12 Watson William S Single core triaxial flux-gate magnetometer
FR2982409A1 (en) * 2011-11-07 2013-05-10 Schneider Electric Ind Sas Method for manufacturing magnetic core for direct current sensor in differential circuit breaker, involves fixing layers with each other to form band, and forming core from band, where section of core is formed based on number of layers

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1774856A (en) * 1924-04-22 1930-09-02 Dubilier Condenser Corp Magnetic device
US1875590A (en) * 1930-06-30 1932-09-06 Duncan Electric Mfg Co Current transformer
FR1100710A (en) * 1953-05-23 1955-09-23 Steatit Magnesia Ag ferromagnetic ceramic element
US2799822A (en) * 1952-07-22 1957-07-16 Cgs Lab Inc Improved controllable inductance apparatus
US2918660A (en) * 1956-05-25 1959-12-22 Burroughs Corp Non-destructive read-out of magnetic cores
US3157866A (en) * 1961-10-25 1964-11-17 Western Electric Co Ring-type magnetic memory element

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1774856A (en) * 1924-04-22 1930-09-02 Dubilier Condenser Corp Magnetic device
US1875590A (en) * 1930-06-30 1932-09-06 Duncan Electric Mfg Co Current transformer
US2799822A (en) * 1952-07-22 1957-07-16 Cgs Lab Inc Improved controllable inductance apparatus
FR1100710A (en) * 1953-05-23 1955-09-23 Steatit Magnesia Ag ferromagnetic ceramic element
US2918660A (en) * 1956-05-25 1959-12-22 Burroughs Corp Non-destructive read-out of magnetic cores
US3157866A (en) * 1961-10-25 1964-11-17 Western Electric Co Ring-type magnetic memory element

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3451047A (en) * 1963-08-30 1969-06-17 Ibm Eccentric magnetic core
US3497949A (en) * 1966-08-08 1970-03-03 Lucas Industries Ltd Method of making laminated cores
US3740674A (en) * 1972-01-06 1973-06-19 Us Navy Scroll transducer
US4370296A (en) * 1978-03-21 1983-01-25 Fdx Associates, L.P. Toroidal fusion reactor having ohmic heating coil substantially adjacent toroidal fusion region
EP0033441A1 (en) * 1980-02-01 1981-08-12 Hasler AG Pulse transformer and its use as isolation transformer
US4504813A (en) * 1982-12-03 1985-03-12 Mcgraw-Edison Company Energy saving wound core transformer
US4845986A (en) * 1985-08-14 1989-07-11 Toyoda Gosei Co., Ltd. Liquid level indication device
US4760484A (en) * 1986-12-18 1988-07-26 Honeywell, Inc. Protective inductive devices with increased ability to absord volt-seconds in an electrical conductor
US4853292A (en) * 1988-04-25 1989-08-01 Allied-Signal Inc. Stacked lamination magnetic cores
DE3921548A1 (en) * 1989-06-30 1991-01-10 Waasner Elektrotechnische Fabr SHEET PACKAGE FROM EDGE STRIP TAPE SHEETS AND METHOD FOR THE PRODUCTION THEREOF
US5270648A (en) * 1990-08-10 1993-12-14 Watson Industries, Inc. Single core triaxial flux-gate magnetometer
US5329269A (en) * 1990-08-10 1994-07-12 Watson William S Single core triaxial flux-gate magnetometer
EP0497219A2 (en) * 1991-01-28 1992-08-05 Powercube Corporation Integrated magnetic power converter core
EP0497219A3 (en) * 1991-01-28 1993-05-26 Powercube Corporation Integrated magnetic power converter core
FR2982409A1 (en) * 2011-11-07 2013-05-10 Schneider Electric Ind Sas Method for manufacturing magnetic core for direct current sensor in differential circuit breaker, involves fixing layers with each other to form band, and forming core from band, where section of core is formed based on number of layers

Similar Documents

Publication Publication Date Title
US3303449A (en) Toroidal magnetic cores having varying cross-sectional areas
US2716736A (en) Saturable reactor
US3480229A (en) Coil winding form
FI831974L (en) STROEFAELTSFATTIG RADIOAVSTOERNINGSDROSSEL
US2811203A (en) Method for forming ei lamination for shell-type core
US1784833A (en) Toroidal inductance device
GB1191777A (en) Improvements in methods of making Inductive Devices
US1606777A (en) Inductance device
US2703392A (en) Adjustable toroidal inductance
US2407688A (en) Magnetic core
US2488961A (en) Method of making magnetic gores
US2780786A (en) Four leg magnetic core
ATE5924T1 (en) SINGLE-PHASE TRANSFORMER WITH WINDINGS CAST IN RESIN.
GB1072093A (en) Power cryotron
US3181402A (en) Method of forming f-shaped and l-shaped laminations for shell-type core
US3227982A (en) Electromagnet inductor and support therefor
US3003226A (en) Method of magnetic core construction
US2561250A (en) Magnetic core
ES174484U (en) Ignition coil. (Machine-translation by Google Translate, not legally binding)
US3069641A (en) Coders and decoders for pulse code modulation systems
US3132413A (en) Method of making transformer core
GB750109A (en) Improvements in or relating to closed magnetic cores for controllable saturable inductors, magnetic amplifiers or like controllable devices
ES331140A1 (en) A procedure for the manufacture of a roll coil. (Machine-translation by Google Translate, not legally binding)
ES457828A1 (en) Transformer with windings in helical slots of core
US2821688A (en) Three phase split leg and yoke type stacked magnetic core section