EP2193528A1 - Elektrische leistung mit kohlenstoffnanoröhren - Google Patents
Elektrische leistung mit kohlenstoffnanoröhrenInfo
- Publication number
- EP2193528A1 EP2193528A1 EP07818370A EP07818370A EP2193528A1 EP 2193528 A1 EP2193528 A1 EP 2193528A1 EP 07818370 A EP07818370 A EP 07818370A EP 07818370 A EP07818370 A EP 07818370A EP 2193528 A1 EP2193528 A1 EP 2193528A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- layer
- electrical
- electrical line
- carbon nanotubes
- layers
- 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
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/20—Conductive material dispersed in non-conductive organic material
- H01B1/24—Conductive material dispersed in non-conductive organic material the conductive material comprising carbon-silicon compounds, carbon or silicon
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/42—Insulated conductors or cables characterised by their form with arrangements for heat dissipation or conduction
- H01B7/428—Heat conduction
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/0009—Details relating to the conductive cores
Definitions
- the invention relates to a layered electrical conductor with a first layer of a composite with carbon nanotubes.
- Carbon nanotubes also called CNTs (Carbo-Nano-Tube) are microscopic tubular structures made of carbon. Carbon nanotubes are particularly interesting for the electrical and electronics industry due to their extremely high current carrying capacity and thermal conductivity. For example, carbon nanotubes have an approximate thousand times higher current carrying capacity than copper wires, and their thermal conductivity, at approx. 6,000 W, is almost twice as high as that of diamond.
- the composite layer forms the core of the conductor, which is surrounded by an insulating layer, a shielding layer and a protective layer.
- the electromagnetic shielding layer also contains carbon nanotubes.
- the spread of carbon nanotube-based composite materials is currently being curbed by the significant cost that must be borne by these materials relative to traditional conductive materials such as copper and aluminum.
- the invention is therefore based on the object of reducing the material costs of a carbon nanotube-based electrical conductor.
- a stratified electrical line having a first layer of a first material with carbon nanotubes and a second layer, wherein the second layer consists of a thermally conductive second material and immediately adjacent to the first layer, wherein one of the two layers is the other Layer on the circumference at least partially encloses such that a heat generated in the first layer due to a current flowing through the first layer heat loss is substantially released to the second layer.
- heat conductive second material is in this
- the essence of the invention is based on the recognition that the current carrying capacity of a conductor depends not only on the specific conductivity of the conductive material but also on the cooling conditions under which the current transport takes place. Given the geometry and otherwise unchanged boundary conditions for the temperatures, the current carrying capacity of a conductor only increases with the root of the factor, which increases the specific conductivity. So if a material with a nine times better conductivity is used, this leads only to a tripling of the permissible continuous current, which can be performed with such an electrical line. As a consequence, in many cases good electrical conductivity properties can only be inefficiently exploited, since the heat generated in conductors can not be dissipated in sufficient quantity.
- the heat dissipated by an electrical line per unit of time depends crucially on the effective surface of the conductor, which can make this available for this purpose. Due to the high cost of materials that must be applied to the carbon nanotube-containing material of the first layer, it would be very uneconomical to increase the cross-sectional area and thus the heat-dissipating surface of a built-up of the first material conductor such that the excellent electrical conductivity properties of the Carbon nanotubes can be fully exploited. According to the invention, the problem of heat dissipation is addressed by a much more favorable solution, in which the second layer of a good heat conductive material such as copper or aluminum is used to increase the cross section of the electrical line and thus their heat dissipating surface. Due to the excellent conductivity of the first layer with the carbon nanotubes, the flow of current will concentrate primarily in the first layer. The heat generated in this case, due to the also still be characterized as good thermal conductivity of the second layer of this led and brought to the surface.
- the electrical line By the second much cheaper layer not only the thermal conductivity and thus the current carrying capacity of the electrical line are increased. Due to the larger cross-section, which results from the addition of the second layer, the electrical line also receives a comparatively higher strength. The resulting larger cross-section also ensures a lower field strength at the surface of the electrical line. Due to the volume introduced by the two layers, the short-circuit current carrying capacity of the electrical line according to the invention can also be increased since a higher thermal capacitance results compared to an electrical conductor of the same conductivity, which consists only of the first material.
- an embodiment of the invention is advantageous in which the first material is designed as a composite.
- CNTs may be included to some extent to produce the desired conductive properties.
- the thermal conductivity but also the electrical conductivity can be further increased in an advantageous embodiment of the invention, when the heat-conductive material is an electrical conductor, in particular a metallic conductor. In that case, part of the current to be conducted from the electric wire is also passed through the second layer, thereby relieving the first layer.
- an embodiment of the invention is advantageous in which one of the two layers completely surrounds the other layer at its periphery. This is especially true when the heat transfer resistance between the layers is less than the heat transfer resistance of the first layer to the environment.
- a further advantageous embodiment of the invention is characterized in that the two layers are arranged coaxially to each other and one of the two layers forms an axially extending core of the conduit.
- the surface available for heat removal is determined by the outer layer in such an embodiment.
- a large surface area available for heat removal can be achieved in that the second layer completely surrounds the first layer at its circumference. closes.
- the heat generated in the first layer by the current transport can be transmitted to the second layer, which finally emits this heat to the environment over a comparatively large surface area.
- an embodiment of the invention may be expedient in which the first layer completely encloses the second layer at its periphery.
- the second layer made of the cheaper material forms the core of the coaxial assembly. This core only has to be covered with a comparatively thin layer of the first, more expensive material.
- Such a tubular conductor is particularly advantageous if the current to be supplied has high-frequency components. Due to the high frequencies, there is a current displacement, which leads in this embodiment to the fact that the current components displaced to the surface of the electrical line flow in the area of the extremely conductive first material. Thus, the frequency-dependent increase in resistance of such a conductor is relatively small compared to conventional conductors, which consist only of a conductive layer.
- Embodiments may be advantageously combined into a stranded wire. If an embodiment is selected for the electrical conduction in which the second layer surrounds the first layer at its entire circumference, additional insulation such as, for example, a lacquer can be dispensed with. This is due to the fact that the electrical conductivity of the first material is so high that even a copper or aluminum layer surrounding the core will act approximately as an electrical insulation between the individual wires because conductivity difference of the layers is very high, although both materials the group of electrical conductors are assigned. The fact that in such a stranded wire on an additional paint or Plastic insulation can be omitted, also increases the internal electrical and thermal conductivity of the strand and thus the current carrying capacity. The result is a higher filling factor, that is a relatively higher volume fraction, which is filled with electrically and thermally conductive material, as is the case with conventionally insulated stranded wires.
- additional insulation such as, for example, a lacquer
- FIG. 1 shows the cross section of a first electrical line with a core made of a composite with carbon nanotubes
- FIG. 2 shows the cross section of a second electrical line with a core made of a composite with carbon nanotubes
- FIG. 3 shows the cross section of a third electrical line with a tubular layer of a composite with carbon nanotubes
- FIG. 4 shows the cross section of a fourth electrical line with a tubular layer a composite with carbon nanotubes
- 5 shows a groove with electrical lines, which have a layer of a composite with carbon nanotubes and
- FIG. 6 shows a stranded wire with electrical lines which have a layer of a composite with carbon nanotubes.
- FIG. 1 shows the cross section of a first electrical line with a core made of a composite with carbon nanotubes.
- the illustrated electrical line is constructed in a layered manner.
- a first layer 1 of the electrical line is formed by the composite material in which the extremely conductive carbon nanotubes are located. Due to the cost of this material, the cross-sectional area and thus the circumference of the first layer 1 is comparatively small. Since the electrical conductivity of the composite material is very high, the given cross-sectional area is sufficient for the transport of very high currents, if it is ensured that the resulting heat is dissipated sufficiently to the outside.
- a second layer 2 around the first layer 1 coaxially with the first layer 1, which consists of a material of very good conductivity.
- a metal such as copper or aluminum may be used for this purpose.
- the use of a conductive metal in addition to the good thermal conductivity also has the advantage that a part of the current transport can also be taken over by the second layer 2.
- the electrical line is finally surrounded by a plastic insulation.
- FIG. 2 shows the cross section of a second electrical line with a core made of a composite with carbon nanotubes.
- the arrangement shown corresponds essentially to the arrangement shown in FIG.
- a lacquer layer 4 provided for electrical insulation of the entire electrical line to the outside.
- FIG. 3 shows the cross section of a third electrical line with a tubular layer made of a composite
- the first layer 1 of the electrical line is located on a core formed by the second layer 2.
- the first layer 1 itself has a very large surface through which it can emit the heat, without having to use large amounts of the composite material for this purpose.
- Insulated to the outside, the first layer 1 is again replaced by a plastic insulation 3, which, as shown in FIG. 4, can also be replaced by a lacquer layer 4.
- FIG. 4 shows the same structural design of the electrical line as FIG. 3.
- the embodiments of the electrical line illustrated in FIGS. 3 and 4 have advantages, particularly at high frequencies of the current to be transported.
- FIG. 5 shows a groove 5 with electrical leads which have a layer of a composite with carbon nanotubes.
- FIG. 5 it is also possible, using the two-layered electrical conductors, to build up winding packages for electrical machines, which are characterized by a very low specific resistance. Therefore, much higher magnetic field strengths can be generated within these machines with the electrical lines according to the invention than is the case with conventional conductors.
- FIG. 6 shows a stranded wire with electrical leads which comprise a layer of composite with carbon nanotubes. The individual lines each have a first layer 1 of the composite material, which forms the core of the lines, and a second layer 2 of a good thermal conductivity material such as copper or aluminum.
- the second layer 2 acts as an insulating layer which sufficiently insulates the individual electrical leads of the strand from one another.
- the thermal conductivity of the second layer 2 is very high, so that the heat between the individual wires of the Litz wire can be exchanged. As a result, the current carrying capacity of the stranded wire compared to conventional stranded wire can be significantly increased.
Landscapes
- Insulated Conductors (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Spectroscopy & Molecular Physics (AREA)
Abstract
Description
Claims
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2007/008283 WO2009039872A1 (de) | 2007-09-24 | 2007-09-24 | Elektrische leistung mit kohlenstoffnanoröhren |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2193528A1 true EP2193528A1 (de) | 2010-06-09 |
EP2193528B1 EP2193528B1 (de) | 2018-12-26 |
Family
ID=39511114
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07818370.4A Not-in-force EP2193528B1 (de) | 2007-09-24 | 2007-09-24 | Elektrische leistung mit kohlenstoffnanoröhren |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP2193528B1 (de) |
WO (1) | WO2009039872A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008064579B4 (de) * | 2008-12-22 | 2012-03-15 | Siemens Aktiengesellschaft | Verfahren und Trägerzylinder zur Herstellung einer elektrischen Wicklung |
US9449739B2 (en) | 2012-10-16 | 2016-09-20 | The Boeing Company | High power, high frequency power cable |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1837952A (en) * | 1927-10-31 | 1931-12-22 | Delon Jules | Electric cable |
GB319792A (en) * | 1928-09-28 | 1930-07-03 | Hugo Sonnenfeld | Armouring for power cables |
GB1002525A (en) * | 1963-08-01 | 1965-08-25 | Ass Elect Ind | Improvements in or relating to electrical power cables |
US3798346A (en) * | 1973-04-16 | 1974-03-19 | Midland Ross Corp | Power transmission apparatus, especially cable and cable bus housings |
SE7801543L (sv) * | 1978-02-09 | 1979-08-10 | Ssab Svenskt Stal Ab | Rorkabel |
EP0729158B1 (de) * | 1995-02-24 | 2003-04-09 | Sumitomo Wiring Systems, Ltd. | Strahlender Draht |
JP2005096024A (ja) * | 2003-09-24 | 2005-04-14 | Fuji Xerox Co Ltd | ワイヤとその製造方法および該ワイヤを用いた電磁石 |
JP2006260898A (ja) * | 2005-03-16 | 2006-09-28 | Auto Network Gijutsu Kenkyusho:Kk | シールド導電路及びシート状導電路の製造方法 |
JP2006269201A (ja) * | 2005-03-23 | 2006-10-05 | Auto Network Gijutsu Kenkyusho:Kk | シールド導電路 |
-
2007
- 2007-09-24 EP EP07818370.4A patent/EP2193528B1/de not_active Not-in-force
- 2007-09-24 WO PCT/EP2007/008283 patent/WO2009039872A1/de active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2009039872A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2009039872A1 (de) | 2009-04-02 |
EP2193528B1 (de) | 2018-12-26 |
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