FR2247795A1 - Screened coil for few turns flat winding - leakage flux is reduced by close fitting screen with overlapped joints - Google Patents

Screened coil for few turns flat winding - leakage flux is reduced by close fitting screen with overlapped joints

Info

Publication number
FR2247795A1
FR2247795A1 FR7433937A FR7433937A FR2247795A1 FR 2247795 A1 FR2247795 A1 FR 2247795A1 FR 7433937 A FR7433937 A FR 7433937A FR 7433937 A FR7433937 A FR 7433937A FR 2247795 A1 FR2247795 A1 FR 2247795A1
Authority
FR
France
Prior art keywords
screen
leakage flux
few turns
reduced
close fitting
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.)
Granted
Application number
FR7433937A
Other languages
French (fr)
Other versions
FR2247795B3 (en
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.)
Airbus Defence and Space GmbH
Original Assignee
Messerschmitt Bolkow Blohm AG
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 Messerschmitt Bolkow Blohm AG filed Critical Messerschmitt Bolkow Blohm AG
Publication of FR2247795A1 publication Critical patent/FR2247795A1/en
Application granted granted Critical
Publication of FR2247795B3 publication Critical patent/FR2247795B3/fr
Granted 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
    • 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
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36—Electric or magnetic shields or screens
    • H01F27/363—Electric or magnetic shields or screens made of electrically conductive material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L3/00—Devices along the route for controlling devices on the vehicle or train, e.g. to release brake or to operate a warning signal
    • B61L3/02—Devices along the route for controlling devices on the vehicle or train, e.g. to release brake or to operate a warning signal at selected places along the route, e.g. intermittent control simultaneous mechanical and electrical control
    • B61L3/08—Devices along the route for controlling devices on the vehicle or train, e.g. to release brake or to operate a warning signal at selected places along the route, e.g. intermittent control simultaneous mechanical and electrical control controlling electrically
    • B61L3/12—Devices along the route for controlling devices on the vehicle or train, e.g. to release brake or to operate a warning signal at selected places along the route, e.g. intermittent control simultaneous mechanical and electrical control controlling electrically using magnetic or electrostatic induction; using radio waves
    • B61L3/121—Devices along the route for controlling devices on the vehicle or train, e.g. to release brake or to operate a warning signal at selected places along the route, e.g. intermittent control simultaneous mechanical and electrical control controlling electrically using magnetic or electrostatic induction; using radio waves using magnetic induction
    • 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
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36—Electric or magnetic shields or screens

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Mechanical Engineering (AREA)
  • Regulation Of General Use Transformers (AREA)
  • Electromagnets (AREA)
  • Coils Or Transformers For Communication (AREA)

Abstract

A coil carrying alternating current, especially one of a few turns of a flat conductor, such as used for inductive linkage between a tracked vehicle and a trackside conductor having a U shaped frame core of ferrite with a winding (3) on the yoke (2) surrounded by a closely fitting screen (4) leaving the pole faces (5) of the core exposed. To prevent the screen acting as a short-circuited turn it is electrically interrupted by an overlapping joint (6) with an electrical insulator, which may be an adhesive coating between the overlapping surfaces. The overlap joint extends round the interior of the core over the full length of the screen so as to coincide with that of the magnetic flux in the space enclosed by the screen and reduce leakage flux.
FR7433937A 1973-10-10 1974-10-09 Screened coil for few turns flat winding - leakage flux is reduced by close fitting screen with overlapped joints Granted FR2247795A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19732350805 DE2350805A1 (en) 1973-10-10 1973-10-10 AC FLOWED COIL

Publications (2)

Publication Number Publication Date
FR2247795A1 true FR2247795A1 (en) 1975-05-09
FR2247795B3 FR2247795B3 (en) 1977-07-22

Family

ID=5894997

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7433937A Granted FR2247795A1 (en) 1973-10-10 1974-10-09 Screened coil for few turns flat winding - leakage flux is reduced by close fitting screen with overlapped joints

Country Status (5)

Country Link
JP (1) JPS5082557A (en)
DE (1) DE2350805A1 (en)
FR (1) FR2247795A1 (en)
NL (1) NL7413177A (en)
SE (1) SE7412676L (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0532360A1 (en) * 1991-09-13 1993-03-17 Vlt Corporation Transformer with controlled interwinding coupling and controlled leakage inductances and circuit using such transformer
US6143157A (en) * 1995-11-27 2000-11-07 Vlt Corporation Plating permeable cores

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0532360A1 (en) * 1991-09-13 1993-03-17 Vlt Corporation Transformer with controlled interwinding coupling and controlled leakage inductances and circuit using such transformer
US5546065A (en) * 1991-09-13 1996-08-13 Vlt Corporation High frequency circuit having a transformer with controlled interwinding coupling and controlled leakage inductances
EP0881647A1 (en) * 1991-09-13 1998-12-02 Vlt Corporation Transformer with controlled interwinding coupling and controlled leakage inductances and circuit using such transformer
US6653924B2 (en) 1991-09-13 2003-11-25 Vlt Corporation Transformer with controlled interwinding coupling and controlled leakage inductances and circuit using such transformer
US6143157A (en) * 1995-11-27 2000-11-07 Vlt Corporation Plating permeable cores
US6165340A (en) * 1995-11-27 2000-12-26 Vlt Corporation Plating permeable cores

Also Published As

Publication number Publication date
FR2247795B3 (en) 1977-07-22
JPS5082557A (en) 1975-07-04
NL7413177A (en) 1975-04-14
DE2350805A1 (en) 1975-09-04
SE7412676L (en) 1975-04-11

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Legal Events

Date Code Title Description
ST Notification of lapse