EP2842136A1 - Cable en fils de litz - Google Patents
Cable en fils de litzInfo
- Publication number
- EP2842136A1 EP2842136A1 EP13727369.4A EP13727369A EP2842136A1 EP 2842136 A1 EP2842136 A1 EP 2842136A1 EP 13727369 A EP13727369 A EP 13727369A EP 2842136 A1 EP2842136 A1 EP 2842136A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tube
- strands
- conductor
- electrical conductor
- electrical
- 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
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/30—Insulated conductors or cables characterised by their form with arrangements for reducing conductor losses when carrying alternating current, e.g. due to skin effect
- H01B7/303—Conductors comprising interwire insulation
-
- 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
- H01B7/421—Insulated conductors or cables characterised by their form with arrangements for heat dissipation or conduction for heat dissipation
- H01B7/423—Insulated conductors or cables characterised by their form with arrangements for heat dissipation or conduction for heat dissipation using a cooling fluid
- H01B7/425—Insulated conductors or cables characterised by their form with arrangements for heat dissipation or conduction for heat dissipation using a cooling fluid the construction being bendable
Definitions
- the present invention is related to an electrical conductor having a plurality of strands extending between two ends, each of the strands having at its surface an electrical insulator layer, the strands being electrically connected in parallel with each end of the electrical conductor.
- This type of conductor is usually called Litz wire.
- the invention aims, above all, to provide a driver allowing the use of high frequencies while minimizing its heating. Facilitating the evacuation of losses will allow the driver to use a higher current, or constant current, not to heat the nearby parts.
- an electrical conductor comprising a plurality of strands extending between two ends, each of the strands having at its surface an electrical insulating layer, the strands being electrically connected in parallel with each end of the electrical conductor, is characterized in that the strands are arranged around at least one tube, made of electrical insulating material, forming a core, the tube being traversed by a cooling fluid, and in that the outer surface of the tube and the strands are impregnated with a electrical insulating paste and having a coefficient of thermal conduction higher than 0.2 W / mK to ensure a good heat transfer between the strands and the tube.
- Each strand can make at least one complete swirler around the tube between the two ends of the conductor.
- the electrical insulating paste has a coefficient of thermal conduction greater than 0.5 W / mK.
- the paste may have a Shore A hardness, according to ISO 868, of less than 75.
- the driver may comprise an outer sheath.
- the tube may have annular or spiral geometry.
- the invention also relates to the use of an electrical conductor as defined above at a frequency between 1 kHz and 500 kHz.
- Fig. 1 is a perspective view of the end of a conductor according to the invention
- Fig. 2 is a cross-sectional view of the conductor of FIG. 1,
- Fig. 3 is a longitudinal sectional view of the conductor of FIG. 1,
- Fig. 4 to 6 are side elevational views of three embodiments of a tube according to the invention.
- FIGS. 7 to 9 are views in longitudinal section of the embodiments of FIGS. 4 to 6,
- Fig. 10 to 12 are views in longitudinal section of three other embodiments of a tube according to the invention.
- Fig. 13 is a side elevational view of another embodiment of a tube according to the invention.
- Fig. 14 is a longitudinal sectional view of the embodiment of
- Fig. 15 to 18 are views in longitudinal section of four other embodiments of a tube according to the invention.
- the conductor core C is constituted by a tube 1 traversed by a cooling fluid.
- the fluid or gas may be water, oil or any other heat transfer fluid.
- the tube 1 is made of electrical insulating polymer so as to avoid, at high frequencies, the induction of eddy currents in the tube 1.
- the tube 1 In order to provide the necessary flexibility to the conductor C, the tube 1 has a spiral profile.
- Strands 2 are arranged longitudinally around the tube 1.
- the strands 2 are grouped to form strands and each strand 2 is covered with a layer of electrical insulator 6. In theory it is not necessary to add additional insulation between the strands because the strands are already isolated.
- Each strand 2 comprises a multitude of insulated wires.
- the strands are isolated in order to improve the mechanical strength of the strand and its handling and to avoid the injuries of the insulating varnish of the strands which rub against each other in contact with two strands.
- the strand strands are distributed all around the tube 1 on its outer part, in single helix in one layer.
- the strands 2 are electrically connected in parallel outside the conductor.
- Each strand 2 has at least one complete swirler between the connection terminals of the two ends of the conductor. This ensures a transposition that promotes the balancing of currents in the strands at high frequencies.
- the length of a conductor depends on its application.
- the outer surface of the tube 1 and the strands 2 are impregnated with a product called thermal paste 4 to ensure good heat transfer between the strands 2 and the tube 1 in order to facilitate the heat transfer of the strands 2 to the cooling fluid flowing in the tube 1.
- the thermal paste 4 is a flexible product which fills the concavities of the pipe, the interstices between the strands 2 and the tube 1.
- the thermal paste is produced from an elastomer of low Shore A hardness and preferably of Shore A hardness less than 75, so as to marry at best the shape of the strands 2 and the tube 1 while accepting the deformations that can undergo the conductor C.
- the thermal paste is also an electrical insulator which favors the electrical insulation of the different strands 2.
- the thermal paste has a coefficient of thermal conductivity which is greater than 0.2 W / mK and preferably greater than 0.5W / mK. It is possible to work with lower coefficients but at the expense of performance.
- the presence of the thermal paste 4 avoids the presence of air while allowing the conductor C to maintain flexibility and a small radius of curvature.
- the radius of curvature of the conductor C thus obtained may be less than five times the diameter of the conductor C.
- the conductor C is sheathed by a finishing sheath 5.
- the conductor C can be simply wrapped or enter the composition of a complex conducteu r pl us.
- tubes having annealed, convoluted, striated or corrugated profiles are possible using tubes having annealed, convoluted, striated or corrugated profiles.
- the conductor can be arranged in many ways around the tube, for example single or multiple helix or cross-arranged in one or more layers or finally braided.
- Ribbed tube is a tube whose appearance looks like rings placed end to end.
- the ridges of the rings and the recesses are respectively looped back on themselves as illustrated in FIG. 5 and Fig. 6.
- the ridge protrudes outside and is hollow inside the tube (Fig. 8 and Fig. 9).
- a hollow seen from the outside has a prominent ridge inside.
- a tube having ridges and hollows in the form of rings on the outside may also be smooth inside as shown in FIG. 1 1 and Fig.12. This means that the wall thickness is not constant.
- a smooth tube on its outer wall and corrugated on the inside can also fulfill the function (Fig. 15).
- the profile of the ridges and valleys can cover all the intermediate forms between the sinusoid and the crenel (Fig. 9, Fig. 17 and Fig.
- Spiral tube means a tube alternately having peaks and valleys which describe revolutions around the axis of the pipe with a fairly tight pitch less than the diameter of the pipe as shown in FIG. 4 and FIG. 13.
- the tube has only one ridge and only one helical groove.
- the profiles of the ridges and furrows in sections can take all the forms described for the corrugated tube as illustrated in particular FIG. 10, Fig. 1 1, Fig.7, Fig.14 and Fig.16. Just like the corrugated tube it can be smooth inside and have ridges and hollows on the outside and vice versa (Fig 14 and Fig.15).
- a convoluted tube is understood to mean a tube whose ridges appear wound around a tube along the longitudinal axis. It has the same characteristics as the spiral tube described above.
- corrugated tube refers to a tube provided with annular or spiral ridges in the axis of the tube in a manner similar to the convoluted tube.
- the conductor according to the invention has many advantages.
- the induction losses in the cooling circuit are very low.
- the useful section of copper is optimized to take into account the skin effect.
- the originality of the invention is also to allow the evacuation of calories produced in an isolated and insulating water circuit.
- Facilitating the evacuation of losses makes it possible to use the conductor according to the invention at a higher current with respect to a conventional conductor, or at a constant current, not to heat the surrounding parts.
- the convolutions of the tube make it possible to maximize the heat exchange surface with the cooling fluid while allowing excellent strain and a very low radius of curvature without loss of cooling.
- Isolation is galvanic between the coolant and the conductors. There are no circulation currents or leaks in the cooling fluids.
Landscapes
- Insulated Conductors (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1253728A FR2989817B1 (fr) | 2012-04-24 | 2012-04-24 | Cable en fils de litz |
PCT/IB2013/053174 WO2013160819A1 (fr) | 2012-04-24 | 2013-04-22 | Cable en fils de litz |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2842136A1 true EP2842136A1 (fr) | 2015-03-04 |
EP2842136B1 EP2842136B1 (fr) | 2017-06-07 |
Family
ID=48577175
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP13727369.4A Active EP2842136B1 (fr) | 2012-04-24 | 2013-04-22 | Cable en fils de litz |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2842136B1 (fr) |
CN (1) | CN104364855B (fr) |
FR (1) | FR2989817B1 (fr) |
WO (1) | WO2013160819A1 (fr) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105225726A (zh) * | 2015-11-07 | 2016-01-06 | 中利科技集团股份有限公司 | 一种管状通风冷却型五芯软电缆及其制造方法 |
CN106782835B (zh) * | 2016-12-20 | 2019-07-16 | 深圳宝兴电线电缆制造有限公司 | 电动汽车大电流充电电缆 |
DE102018123455A1 (de) * | 2018-09-24 | 2020-03-26 | HARTING Automotive GmbH | Flüssigkeitsgekühlter Kabelaufbau |
CN109390079B (zh) * | 2018-11-29 | 2024-06-18 | 东莞市必成电业材料有限公司 | 一种传输线缆用的绕包铜线 |
FR3107635B1 (fr) | 2020-02-24 | 2023-06-02 | Fives Celes | Dispositif de chauffage d’un produit par induction a flux transverse |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TW340532U (en) * | 1995-01-07 | 1998-09-11 | ren-hui Chen | Yarn brake |
GB2323207A (en) * | 1997-03-11 | 1998-09-16 | Elscint Ltd | Flexible hollow electrical cable |
CN1560879A (zh) * | 2004-03-09 | 2005-01-05 | 罗志昭 | 空心电缆 |
JPWO2006107050A1 (ja) * | 2005-04-04 | 2008-09-25 | 株式会社オートネットワーク技術研究所 | シールド導電体及びその製造方法 |
CN2812233Y (zh) * | 2005-06-23 | 2006-08-30 | 天津金山电线电缆股份有限公司 | 惰性气体保护电焊机电缆 |
TWM340532U (en) * | 2008-01-15 | 2008-09-11 | Zheng-Xiong Wu | Energy-saving electric wire and cable |
CN101640078A (zh) * | 2009-09-04 | 2010-02-03 | 王梅生 | 一种变频专用电线电缆 |
CN201636586U (zh) * | 2010-01-22 | 2010-11-17 | 深圳市泳森科技有限公司 | 一种具有良好散热性能的led灯 |
-
2012
- 2012-04-24 FR FR1253728A patent/FR2989817B1/fr not_active Expired - Fee Related
-
2013
- 2013-04-22 EP EP13727369.4A patent/EP2842136B1/fr active Active
- 2013-04-22 WO PCT/IB2013/053174 patent/WO2013160819A1/fr active Application Filing
- 2013-04-22 CN CN201380022095.0A patent/CN104364855B/zh active Active
Also Published As
Publication number | Publication date |
---|---|
FR2989817A1 (fr) | 2013-10-25 |
CN104364855A (zh) | 2015-02-18 |
CN104364855B (zh) | 2018-01-26 |
FR2989817B1 (fr) | 2015-08-21 |
WO2013160819A1 (fr) | 2013-10-31 |
EP2842136B1 (fr) | 2017-06-07 |
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