EP0642143B1 - Bobine de self-inductance - Google Patents
Bobine de self-inductance Download PDFInfo
- 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
Links
- 238000004804 winding Methods 0.000 claims description 14
- 229920003023 plastic Polymers 0.000 claims description 9
- 239000004033 plastic Substances 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 8
- 239000000843 powder Substances 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 239000011810 insulating material Substances 0.000 claims description 3
- 229920001296 polysiloxane Polymers 0.000 claims description 3
- 229910000859 α-Fe Inorganic materials 0.000 claims description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 239000010949 copper Substances 0.000 claims description 2
- 238000013016 damping Methods 0.000 description 3
- 239000004020 conductor Substances 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
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
- H01F17/045—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.
Description
Ainsi une bobine selon l'invention est remarquable en ce qu'elle comporte une barrette faite de matière électriquement résistive qui est placée entre l'enroulement et le noyau, l'enroulement est réalisé en spires non jointives avec un fil nu, et le fil est en contact avec la barrette.
On entend par "électriquement résistive" que la matière de la barrette n'est ni isolante ni bonne conductrice mais entre les deux.
De préférence, le noyau comporte au moins une partie externe cylindrique en matière plastique à la surface de laquelle est ménagée une gorge longitudinale dans laquelle est placée la barrette, et la section de cette dernière est de dimension telle, comparée à celle de la gorge, qu'une partie de la barrette dépasse à l'extérieur de la gorge, de façon à toucher le fil de bobinage.
En outre le cylindre de matière plastique comporte avantageusement sur sa surface extérieure cylindrique un sillon hélicoïdal.
Ce sillon permet de guider le fil pendant le bobinage et de le maintenir en place par la suite.
La barrette est faite par exemple de matière isolante chargée de poudre conductrice, par exemple de silicone chargé d'une poudre de carbone.
La figure 1 est une vue en perspective d'un noyau pour une bobine selon l'invention.
La figure 2 est une vue en coupe transversale d'une bobine selon l'invention.
La figure 3 est une vue en coupe axiale d'une bobine selon l'invention.
A la surface de ce dernier est ménagée une gorge longitudinale, par exemple de profil rectangulaire, dans laquelle est placée une barrette 2 faite de matière électriquement résistive et dont la section, rectangulaire elle aussi, est de dimension telle, comparée à celle de la gorge, qu'une partie de la barrette dépasse à l'extérieur de la gorge. La coupe de la figure 2 montre en plus une spire de fil de bobinage 3, par exemple en cuivre étamé, entourant le cylindre de matière plastique 1. Au passage sur la barrette 2, le fil 3 est appuyé sur cette dernière. La barrette 2 est faite par exemple de silicone chargé d'une poudre conductrice faite de carbone. Il est aisé de déterminer de façon expérimentale la résistivité qui convient le mieux.
La coupe de la figure 3 montre que le cylindre de matière plastique 1 comporte sur sa surface extérieure cylindrique un sillon hélicoïdal 5. Ce sillon permet non seulement de guider le fil pendant le bobinage et de le maintenir en place par la suite, mais il assure en outre que l'enroulement soit réalisé en spires non jointives. Toutefois un enroulement en spires non jointives pourrait aussi être réalisé sans l'aide de ce sillon. Le fil est nu, c'est-à-dire non recouvert d'isolant, et chaque spire 3 touche la barrette 2. Le fil est appuyé sur la barrette et s'y enfonce légèrement, du fait que cette dernière est faite d'un matériau légèrement élastique.
Ainsi une résistance se trouve connectée en parallèle sur chaque spire de la bobine et l'amortissement est plus efficace, car la résistance d'amortissement est répartie.
Claims (8)
- Bobine de self-inductance comportant un enroulement de fil électrique bobiné autour d'un noyau rectiligne, caractérisée en ce qu'elle comporte une barrette (2) faite de matière électriquement résistive qui est placée entre l'enroulement et le noyau (1, 4), en ce que l'enroulement est réalisé en spires non jointives avec un fil nu (3), et en ce que le fil est en contact avec la barrette.
- Bobine de self-inductance selon la revendication 1, caractérisée en ce que le noyau comporte au moins une partie externe cylindrique en matière plastique (1) à la surface de laquelle est ménagée une gorge longitudinale dans laquelle est placée la barrette, et la section de cette dernière est de dimension telle, comparée à celle de la gorge, qu'une partie de la barrette dépasse à l'extérieur de la gorge, de façon à toucher le fil de bobinage.
- Bobine de self-inductance selon la revendication 2, caractérisée en ce que le cylindre de matière plastique contient au moins un cylindre de ferrite (4).
- Bobine de self-inductance selon la revendication 2, caractérisée en ce que le cylindre de matière plastique comporte sur sa surface extérieure cylindrique un sillon hélicoïdal (5).
- Bobine de self-inductance selon l'une quelconque des revendications 1 à 4, caractérisée en ce que la barrette est faite de matière isolante chargée de poudre conductrice.
- Bobine de self-inductance selon la revendication 5, caractérisée en ce que la matière isolante est faite de silicone.
- Bobine de self-inductance selon l'une des revendications 5 ou 6, caractérisée en ce que la poudre conductrice est faite de carbone.
- Bobine de self-inductance selon l'une quelconque des revendications 1 à 7, caractérisée en ce que le fil électrique est en cuivre étamé.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9310428 | 1993-09-01 | ||
FR9310428A FR2709595A1 (fr) | 1993-09-01 | 1993-09-01 | Bobine de self-inductance. |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0642143A2 EP0642143A2 (fr) | 1995-03-08 |
EP0642143A3 EP0642143A3 (fr) | 1995-05-10 |
EP0642143B1 true EP0642143B1 (fr) | 1999-12-08 |
Family
ID=9450487
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94202489A Expired - Lifetime EP0642143B1 (fr) | 1993-09-01 | 1994-08-31 | Bobine de self-inductance |
Country Status (5)
Country | Link |
---|---|
US (1) | US5550523A (fr) |
EP (1) | EP0642143B1 (fr) |
JP (1) | JPH07122431A (fr) |
DE (1) | DE69421976T2 (fr) |
FR (1) | FR2709595A1 (fr) |
Families Citing this family (4)
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)
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 |
-
1993
- 1993-09-01 FR FR9310428A patent/FR2709595A1/fr not_active Withdrawn
-
1994
- 1994-08-24 US US08/295,444 patent/US5550523A/en not_active Expired - Fee Related
- 1994-08-29 JP JP6203673A patent/JPH07122431A/ja not_active Ceased
- 1994-08-31 DE DE69421976T patent/DE69421976T2/de not_active Expired - Fee Related
- 1994-08-31 EP EP94202489A patent/EP0642143B1/fr not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
US5550523A (en) | 1996-08-27 |
EP0642143A3 (fr) | 1995-05-10 |
EP0642143A2 (fr) | 1995-03-08 |
JPH07122431A (ja) | 1995-05-12 |
DE69421976D1 (de) | 2000-01-13 |
FR2709595A1 (fr) | 1995-03-10 |
DE69421976T2 (de) | 2000-07-20 |
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