EP0477006B1 - Câble électrique à haute impédance et son procédé de fabrication - Google Patents

Câble électrique à haute impédance et son procédé de fabrication Download PDF

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Publication number
EP0477006B1
EP0477006B1 EP19910308533 EP91308533A EP0477006B1 EP 0477006 B1 EP0477006 B1 EP 0477006B1 EP 19910308533 EP19910308533 EP 19910308533 EP 91308533 A EP91308533 A EP 91308533A EP 0477006 B1 EP0477006 B1 EP 0477006B1
Authority
EP
European Patent Office
Prior art keywords
conductors
conductor
surface portion
cable assembly
electrical cable
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
EP19910308533
Other languages
German (de)
English (en)
Other versions
EP0477006A1 (fr
Inventor
Richard F. Strauss
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.)
ABB Installation Products Inc
Original Assignee
Thomas and Betts Corp
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
Priority claimed from US07/585,858 external-priority patent/US5049215A/en
Priority claimed from US07/585,860 external-priority patent/US5091610A/en
Application filed by Thomas and Betts Corp filed Critical Thomas and Betts Corp
Publication of EP0477006A1 publication Critical patent/EP0477006A1/fr
Application granted granted Critical
Publication of EP0477006B1 publication Critical patent/EP0477006B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01B7/08—Flat or ribbon cables
    • H01B7/0823—Parallel wires, incorporated in a flat insulating profile
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/0006—Apparatus or processes specially adapted for manufacturing conductors or cables for reducing the size of conductors or cables
    • 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

  • This invention relates generally to high impeded electrical cable and also relates to a method of forming a high impedance cable having conductors being spaced at a given pitch.
  • Cable of this type typically includes a plurality of electrical conductors arranged in side-by-side spaced orientation. These conductors are surrounded by an insulative casing which electrically isolates each of the conductors.
  • each conductor measured by the cross-sectional area, dictates the amount of signal current that each conductor can carry.
  • the amount of signal current carried is directly proportional to the size of the conductor.
  • the impedance value of the cable is related, in part, to the spacing between adjacent conductors.
  • the greater the space between adjacent conductors i.e. the more insulating mass therebetween the greater the impedance value of the cable.
  • Wires of non-circular cross-section are known, for example, from GB-A-336 784 which shows condenser wires used as supplementary wires on trunk cables.
  • the two condenser wires in one embodiment are semicircular in cross-section, and planar surfaces face one another.
  • the condenser wires are individually insulated and have a common covering which is essentially oval in cross-section.
  • an electrical cable assembly comprising the steps of:
  • an electrical cable assembly comprising:
  • Figure 1 shows an extend of a conventional round conductor of the type used in accordance with the present invention.
  • Figure 2 shows schematically, the cross-sectional shape of the conductor of Figure 1.
  • Figure 3 shows, partially in section and partially schematically, a portion of a conventional flat multiconductor cable including round conductors of the type shown in Figure 1.
  • FIG. 4 shows schematically, an electrical conductor formed in accordance with the present invention.
  • Figure 5 shows, partially in section and partially schematically, a portion of an electrical cable of the present invention employing the conductor shown in Figure 4.
  • Conductor 10 is a solid round copper wire of conventional construction used to transmit electrical signals therealong.
  • Conductor 10 has a major longitudianl axis c and a circular cross-sectional shape as shown in Figure 2.
  • Typical wire sizes used in accordance with the present invention include American Wire Gage (AWG) sizes 26 through 30. Round conductors of these sizes have diameters d of between .010 inches and .016 inches. The cross-sectional areas of these conductors range between approximately 100 and 250 circular mils. Electrical resistance of a copper wire is inversely proportional to its cross-sectional area. Therefore, larger wires will have less resistance and can accordingly carry a greater amount of electrical signal therealong.
  • AMG American Wire Gage
  • Cable assembly 12 includes an electrically insulative casing 14 formed of extruded plastic such as polyvinyl chloride (PVC).
  • Casing 14 is generally flat having an upper planar surface 16 and a lower planar surface 18 substantially parallel thereto. While planar surfaces 16 and 18 are shown as flat, cable having undulating planar surfaces may also be employed. Cables of this type are commonly referred to as ribbon cables.
  • Conductors 10 are supported within casing 14 in electrical isolation. Conductors 10 are spaced from one another within casing 14 at a given pitch. Conductor pitch is defined by the distance between center line c of adjacent conductors 10. The pitch between conductors of flat ribbon cable is critical as ribbon cable is designed to be mass terminated to electrical connectors (not shown) having insulation displacing contacts fixedly supported in an insulative housing. the pitch of the cable must match the pitch of the connector. In Figure 3, the conductors are spaced at a pitch of P1. Since conductors 10 are of the round variety, the actual space between facing surfaces of adjacent conductors will be less than P1.
  • the distance between tangent points T1 and T2 of side-by-side conductors 10′ and 10 ⁇ is S1, which is substantially less than P1.
  • the impedance value of an electrical cable is determined, in part, by the special separation between facing surfaces of adjacent conductors. As a mass of insulating material increases between adjacent conductors, the impedance value of the cable will correspondingly increase. Thus, as conductor size is increased and/or the pitch between conductors is decreased, the impedance value of the cable will drop.
  • the present invention provides a technique for placing conductors at a closer pitch without either decreasing conductor size or decreasing the impedance value of the cable.
  • Conductor 20 is formed from a conventional solid round conductor such as conductor 10 shown in Figure 1.
  • the round conductor 20 is passed through flattening rollers (not shown) to form flat surfaces 21 along the length thereof.
  • the rollers are of the type conventionally used in the metallic forming art to press flat surfaces on metallic objects. Rollers capable of such function are commercially available.
  • Flat surfaces 21 may be placed on conductor 20 either simultaneously or by separate forming steps. As shown in Figure 4, flat surfaces 21 are diametrically opposed and substantially parallel to one another.
  • An important feature of the present invention is that rather than cutting a flat surface on each diametrical side of conductor 20, the conductor is actually flattened in a manner such that opposed upper and lower rounded conductor surfaces 23 and 25 are outwardly deformed from their original condition. Thus, the cross-sectional area of conductor 20 does not change during formation. This permits the conductor to carry the same amount of signal current as was possible prior to the forming steps employed in the present invention.
  • upper and lower surfaces 23, 25 also substantially maintain their rounded configuration. This facilitates the ability to mass terminate cable assembly 22 (Fig. 5) with conventional electrical connectors having insulation displacing contacts (not shown).
  • Cable assembly 22 includes insulative casing 24 similar to casing 14 shown in Figure 3.
  • Casing 24 includes upper and lower major planar surfaces 26 and 28 respectively which support therebetween conductors 20.
  • Cable assembly 22 includes conductors 20 of the type shown in Figure 4.
  • Conductors 20 are arranged within casing 24 so that flattened surfaces 21 are substantially perpendicular to major planar surfaces 26 and 28 and center lines c line in a common plane.
  • Rounded surfaces 23 and 25 face major surfaces 26 and 28 respectively.
  • Cable assembly 22 is typically formed by extruding insulative casing 24 over conductors 20.
  • the conductors 20 of cable assembly 22 are spaced at a pitch P1 which is less than P2 the pitch of cable assembly 12 (Fig. 3). Since each of conductors 20 includes flattened surfaces 21, the distance S2 between facing flattened surfaces 21 of adjacent conductors 20′ and 20 ⁇ is not correspondingly reduced. Comparing cable assembly 12 shown in Figure 3, with cable assembly 22 of the present invention shown in Figure 5, this feature is illustrated. While the conductor pitch of the cable assembly 22 of the present invention has been reduced from P1 to P2, the actual spacing between facing surfaces of adjacent conductors remains substantially the same. That is, S1 ⁇ S2.
  • the impedance value of cable assembly 22 would be substantially similar to impedance value of cable assembly 12. Also, as mentioned above, since conductors 20 maintain the same cross-sectional area as conductors 10, the signal carrying capability of cable assembly 22 is not reduced.
  • the present invention employs multiple conductors, each identically formed to have diametrically opposed flattened surfaces 21.
  • conductors 20 may be formed to have only one flattened surface.
  • only selected ones of conductors 20 may be formed to have one or more flattened surfaces. This would permit the cable assembly 22 to have selected different impedance values as between various pairs of conductors.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Insulated Conductors (AREA)
  • Coupling Device And Connection With Printed Circuit (AREA)
  • Multi-Conductor Connections (AREA)

Claims (11)

  1. Un procédé de fabrication d'un ensemble de câble électrique (22) comprenant les étapes consistant à :
    prévoir un premier conducteur électrique allongé (20) de section transversale sensiblement circulaire ;
    aplatir une première partie de surface (21) dudit premier conducteur (20) dans sa longueur;
    prévoir d'autres conducteurs électriques (20);
    agencer ledit premier conducteur (20), dans un rapport d'espacement transversal, adjacent à un second conducteur (20) avec ladite première partie de surface aplatie (21) du premier conducteur faisant face audit second conducteur; et
    former une gaine isolante (24) sur lesdits conducteurs pour placer lesdits conducteurs en isolement électrique mutuel, la gaine ayant une première surface plane principale (26) s'étendant parallèlement aux axes longitudinaux des conducteurs.
  2. Un procédé selon la revendication 1, comprenant les étapes d'aplatissement d'une seconde partie de surface (21) dudit premier conducteur (20) dans sa longueur, ladite première partie de surface aplatie étant espacée de et sensiblement parallèle à ladite seconde partie de surface aplatie.
  3. Un procédé selon la revendication 1 ou 2, dans lequel ledit second conducteur (20) a une section transversale sensiblement circulaire, et comprenant, en outre, l'étape d'aplatissement d'une première partie de surface (21) dudit second conducteur dans sa longueur.
  4. Un procédé selon la revendication 3, dans lequel ladite étape d'agencement comprend, en outre, l'agencement desdits premier et second conducteurs (20) de manière que lesdites premières parties de surface aplaties (21) desdits premier et second conducteurs soient disposées face à face.
  5. Un procédé selon l'une quelconque des revendications 1 à 4, dans lequel ladite étape de formation comprend l'extrusion de ladite gaine isolante (24) sur lesdits premier et second conducteurs.
  6. Un ensemble de câble électrique comprenant: une pluralité de conducteurs électriques allongés (20); et
    une gaine électriquement isolante allongée (24) entourant de façon continue chacun desdits conducteurs et supportant lesdits conducteurs dans un rapport d'espacement transversal, isolés électriquement, côte à côte, ladite gaine comprenant une première surface plane principale (26) disposée parallèlement aux axes des conducteurs;
    l'un desdits conducteurs (20) comprenant une première partie de surface plate (21) faisant face à l'un desdits conducteurs adjacents et une première partie de surface courbe (23) faisant face à ladite première surface plane principale (26).
  7. Un ensemble de câble électrique selon la revendication 6, dans lequel ladite gaine (24) comprend une seconde surface plane principale (28) espacée de et sensiblement parallèle à ladite première surface plane principale (26) et dans lequel lesdits conducteurs (20) sont supportés entre lesdites surfaces planes.
  8. Un ensemble de câble électrique selon la revendication 6 ou 7, dans lequel un conducteur (20) comprend une seconde partie de surface plate (21) espacée de et sensiblement parallèle à ladite première partie de surface plate (21).
  9. Un ensemble de câble électrique selon l'une quelconque des revendications 6 à 8, dans lequel un conducteur (20) comprend une seconde partie de surface courbe (25) faisant face à ladite seconde surface plane principale (28).
  10. Un ensemble de câble électrique selon l'une quelconque des revendications 6 à 9, dans lequel l'un desdits conducteurs adjacents comprend une première partie de surface plate (21) faisant face à ladite partie de surface plate dudit conducteur.
  11. Un ensemble de câble électrique selon la revendication 6, dans lequel chaque conducteur (20) comprend des première et seconde surfaces parallèles plates (21) et des première et seconde parties de surface courbes (23, 25) s'étendant entre lesdites surfaces plates, ladite gaine ayant une seconde partie de surface plane principale (28) parallèle à ladite première partie de surface plane principale (26) et les surfaces plates parallèles (21) des conducteurs étant disposées sensiblement normales aux première et seconde surfaces planes (26, 28).
EP19910308533 1990-09-19 1991-09-18 Câble électrique à haute impédance et son procédé de fabrication Expired - Lifetime EP0477006B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US585860 1990-09-19
US585858 1990-09-19
US07/585,858 US5049215A (en) 1990-09-19 1990-09-19 Method of forming a high impedance electrical cable
US07/585,860 US5091610A (en) 1990-09-19 1990-09-19 High impedance electrical cable

Publications (2)

Publication Number Publication Date
EP0477006A1 EP0477006A1 (fr) 1992-03-25
EP0477006B1 true EP0477006B1 (fr) 1996-03-06

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Application Number Title Priority Date Filing Date
EP19910308533 Expired - Lifetime EP0477006B1 (fr) 1990-09-19 1991-09-18 Câble électrique à haute impédance et son procédé de fabrication

Country Status (4)

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EP (1) EP0477006B1 (fr)
CA (1) CA2051505C (fr)
DE (1) DE69117631T2 (fr)
ES (1) ES2086494T3 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9064612B2 (en) 2010-08-31 2015-06-23 3M Innovative Properties Company Shielded electrical ribbon cable with dielectric spacing
US9105376B2 (en) 2010-08-31 2015-08-11 3M Innovative Properties Company Connector arrangements for shielded electrical cables
US11854716B2 (en) 2010-08-31 2023-12-26 3M Innovative Properties Company Shielded electrical cable

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9685259B2 (en) 2009-06-19 2017-06-20 3M Innovative Properties Company Shielded electrical cable
WO2010148161A1 (fr) 2009-06-19 2010-12-23 3M Innovative Properties Company Câble électrique blindé
JP5755324B2 (ja) 2010-08-31 2015-07-29 スリーエム イノベイティブ プロパティズ カンパニー 遮蔽電気ケーブルの電気的特性
US10147522B2 (en) 2010-08-31 2018-12-04 3M Innovative Properties Company Electrical characteristics of shielded electrical cables
EP2522021B1 (fr) 2010-08-31 2016-07-27 3M Innovative Properties Company Câble électrique blindé à haute densité et autres câbles blindés, systèmes et procédés
US12205732B2 (en) 2010-08-31 2025-01-21 3M Innovative Properties Company Shielded electric cable
EP2619768B1 (fr) 2010-09-23 2016-06-08 3M Innovative Properties Company Câble électrique blindé

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB336784A (en) * 1928-10-20 1930-10-23 Siemens Ag Trunk cable with compensating condensers
FR1404549A (fr) * 1964-05-20 1965-07-02 Trefimetaux Trese métallique, sa fabrication et produits équipés de cette tresse
US3558803A (en) * 1969-08-26 1971-01-26 Revere Copper & Brass Inc Magnet strip conductor

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9064612B2 (en) 2010-08-31 2015-06-23 3M Innovative Properties Company Shielded electrical ribbon cable with dielectric spacing
US9105376B2 (en) 2010-08-31 2015-08-11 3M Innovative Properties Company Connector arrangements for shielded electrical cables
US9202608B2 (en) 2010-08-31 2015-12-01 3M Innovative Properties Company Connector arrangements for shielded electrical cables
US9202609B2 (en) 2010-08-31 2015-12-01 3M Innovative Properties Company Connector arrangements for shielded electrical cables
US9325121B2 (en) 2010-08-31 2016-04-26 3M Innovative Properties Company Connector arrangements for shielded electrical cables
US11854716B2 (en) 2010-08-31 2023-12-26 3M Innovative Properties Company Shielded electrical cable

Also Published As

Publication number Publication date
EP0477006A1 (fr) 1992-03-25
CA2051505C (fr) 1995-07-04
DE69117631T2 (de) 1996-07-18
CA2051505A1 (fr) 1992-03-20
DE69117631D1 (de) 1996-04-11
ES2086494T3 (es) 1996-07-01

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