EP0642143B1 - Drosselspule - Google Patents

Drosselspule Download PDF

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Publication number
EP0642143B1
EP0642143B1 EP94202489A EP94202489A EP0642143B1 EP 0642143 B1 EP0642143 B1 EP 0642143B1 EP 94202489 A EP94202489 A EP 94202489A EP 94202489 A EP94202489 A EP 94202489A EP 0642143 B1 EP0642143 B1 EP 0642143B1
Authority
EP
European Patent Office
Prior art keywords
bar
inductor
winding
wire
groove
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
EP94202489A
Other languages
English (en)
French (fr)
Other versions
EP0642143A2 (de
EP0642143A3 (de
Inventor
Pascal Société Civile S.P.I.D. Rouet
Bernard Société Civile S.P.I.D. Delvart
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.)
Koninklijke Philips NV
Original Assignee
Philips Electronique Gran Public
Koninklijke Philips Electronics NV
Philips Electronics NV
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 Philips Electronique Gran Public, Koninklijke Philips Electronics NV, Philips Electronics NV filed Critical Philips Electronique Gran Public
Publication of EP0642143A2 publication Critical patent/EP0642143A2/de
Publication of EP0642143A3 publication Critical patent/EP0642143A3/de
Application granted granted Critical
Publication of EP0642143B1 publication Critical patent/EP0642143B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01F17/045—Fixed inductances of the signal type  with magnetic core with core of cylindric geometry and coil wound along its longitudinal axis, i.e. rod or drum core

Definitions

  • the present invention relates to a self-inductance coil comprising a winding of electric wire wound around a straight core.
  • a self-inductance coil is used to inject a low frequency current in a cable of a distribution network television, to power various devices.
  • a coil for the application mentioned above has relatively large dimensions, since it must pass significant currents (of the order of ten amps). Thereby parasitic capacities, between each turn and also vis-à-vis the environment, are bothersome because they induce characteristic of the inductance of many resonant frequencies located in the bandwidth of television signals. This can be fought by damping the resonances by means of resistors depreciation. It has been proposed for example to split the winding into several parts, a resistor being connected in parallel on each of these parts. However, this means is costly to implement. artwork.
  • a coil according to the invention is remarkable in that it comprises a bar made of electrically resistive material which is placed between the winding and the core, the winding is produced in non-contiguous turns with a bare wire, and the wire is in contact with the bar.
  • electrically resistive means that the material of the strip is neither insulating nor good conductor but between the two.
  • the core comprises at least one cylindrical external part made of plastic material on the surface of which is formed a longitudinal groove in which the bar is placed, and the section of the latter is of such dimension, compared to that of the groove, a part of the bar protrudes outside the groove, so as to touch the winding wire.
  • the plastic cylinder preferably contains at least one ferrite cylinder.
  • the plastic cylinder advantageously has on its cylindrical outer surface a helical groove. This groove guides the wire during winding and keeps it in place afterwards.
  • the bar is made for example of insulating material loaded with conductive powder, for example silicone loaded with carbon powder.
  • Figure 1 is a perspective view of a core for a coil according to the invention.
  • Figure 2 is a cross-sectional view of a coil according to the invention.
  • Figure 3 is an axial sectional view of a coil according to the invention.
  • the core according to the invention shown in Figure 1, consists of at least one ferrite cylinder 4 molded from a cylinder 1 made of plastic. On the surface of the latter is formed a longitudinal groove, for example of rectangular profile, in which is placed a bar 2 made of electrically resistive material and whose section, also rectangular, is of such size, compared to that of the groove , that part of the bar protrudes outside the throat.
  • the section of FIG. 2 also shows a turn of winding wire 3, for example of tinned copper, surrounding the plastic cylinder 1. When passing over the bar 2, the wire 3 is pressed on the latter.
  • the bar 2 is made for example of silicone loaded with a conductive powder made of carbon. It is easy to determine experimentally which resistivity is the most suitable.
  • the plastic cylinder 1 has on its cylindrical outer surface a helical groove 5.
  • This groove not only makes it possible to guide the wire during winding and to hold it in place thereafter, but it also ensures in addition that the winding is carried out in non-contiguous turns. However, winding in non-contiguous turns could also be achieved without using this groove.
  • the wire is bare, that is to say not covered with insulation, and each turn 3 touches the bar 2.
  • the wire is pressed on the bar and sinks slightly, because the latter is made of a slightly elastic material.
  • a resistor is connected in parallel on each turn of the coil and the damping is more effective, because the damping resistance is distributed.

Landscapes

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

Claims (8)

  1. Drosselspule, die eine elektrische Drahtwicklung umfaßt, die um einen geradlinigen Kern gewickelt ist, dadurch gekennzeichnet, daß sie eine Spange (2) umfaßt, die aus einem elektrisch widerstandsbehafteten Material besteht und zwischen der Wicklung und dem Kern (1,4) liegt, daß die Wicklung aus berührungsfreien Windungen mit einem nackten Draht (3) hergestellt wird, und daß der Draht die Spange berührt.
  2. Drosselspule gemäß Patentanspruch 1, dadurch gekennzeichnet, daß der Kern wenigstens ein äußeres, zylindrisches Teil aus Kunststoff (1) umfaßt, an dessen Oberfläche eine Längskehle eingearbeitet ist, in die die Spange gelegt wird, und daß der Querschnitt der letzteren im Vergleich zu demjenigen der Kehle so bemessen ist, daß ein Teil der Spange außen über die Kehle hinausragt, so daß sie den Wickeldraht berührt.
  3. Drosselspule gemäß Patentanspruch 2, dadurch gekennzeichnet, daß der Kunststoffzylinder wenigstens einen Ferritzylinder (4) enthält.
  4. Drosselspule gemäß Patentanspruch 2, dadurch gekennzeichnet, daß der Kunststoffzylinder auf seiner zylindrischen Außenfläche eine spiralförmige Rille (5) trägt.
  5. Drosselspule gemäß einem der Patentansprüche 1 bis 4, dadurch gekennzeichnet, daß die Spange aus isolierendem Material besteht, das mit einem leitenden Pulver vermengt ist.
  6. Drosselspule gemäß Patentanspruch 5, dadurch gekennzeichnet, daß das isolierende Material aus Silikon besteht.
  7. Drosselspule gemäß einem der Patentansprüche 5 oder 6, dadurch gekennzeichnet, daß das leitende Pulver aus Kohlenstoff besteht.
  8. Drosselspule gemäß einem der Patentansprüche 1 bis 7, dadurch gekennzeichnet, daß der elektrische Draht aus verzinntem Kupfer ist.
EP94202489A 1993-09-01 1994-08-31 Drosselspule Expired - Lifetime EP0642143B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9310428A FR2709595A1 (fr) 1993-09-01 1993-09-01 Bobine de self-inductance.
FR9310428 1993-09-01

Publications (3)

Publication Number Publication Date
EP0642143A2 EP0642143A2 (de) 1995-03-08
EP0642143A3 EP0642143A3 (de) 1995-05-10
EP0642143B1 true EP0642143B1 (de) 1999-12-08

Family

ID=9450487

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94202489A Expired - Lifetime EP0642143B1 (de) 1993-09-01 1994-08-31 Drosselspule

Country Status (5)

Country Link
US (1) US5550523A (de)
EP (1) EP0642143B1 (de)
JP (1) JPH07122431A (de)
DE (1) DE69421976T2 (de)
FR (1) FR2709595A1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5684341A (en) * 1993-08-07 1997-11-04 Magnet-Physik Dr. Steingroever Gmbh Electromagnetic generator for fast current and magnetic field pulses, for example, for use in magnetic metal working
DE10129163C2 (de) * 2001-06-16 2003-08-28 Bohnert Gmbh Spule mit Kern und Verfahren zu deren Herstellung
US8248198B2 (en) * 2009-07-22 2012-08-21 Johanson Manufacturing Corporation Variable inductor with non-magnetic core and method of manufacture therefor
US10211505B1 (en) * 2017-06-06 2019-02-19 Triad National Security, Llc Sideline radio-frequency power coupler

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE966815C (de) * 1953-07-18 1957-09-12 Siemens Ag Mittels Gewindefuehrung verstellbarer ferromagnetischer Abgleichstift kleinen Durchmessers fuer den Abgleich von auf einem Hauptkern angebrachten Spulen
CH554064A (de) * 1972-03-17 1974-09-13 Siemens Ag Drosselspule.
US4641115A (en) * 1984-06-04 1987-02-03 Texscan Corporation Radio frequency chokes having two windings and means for dampening parasitic resonances
US4638282A (en) * 1985-07-18 1987-01-20 United Technologies Automotive, Inc. Wire cross-over arrangement for coil assembly

Also Published As

Publication number Publication date
US5550523A (en) 1996-08-27
EP0642143A2 (de) 1995-03-08
DE69421976T2 (de) 2000-07-20
DE69421976D1 (de) 2000-01-13
FR2709595A1 (fr) 1995-03-10
EP0642143A3 (de) 1995-05-10
JPH07122431A (ja) 1995-05-12

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