WO2020172281A1 - Fil à section transversale allongée pour blindage de conducteur - Google Patents

Fil à section transversale allongée pour blindage de conducteur Download PDF

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Publication number
WO2020172281A1
WO2020172281A1 PCT/US2020/018835 US2020018835W WO2020172281A1 WO 2020172281 A1 WO2020172281 A1 WO 2020172281A1 US 2020018835 W US2020018835 W US 2020018835W WO 2020172281 A1 WO2020172281 A1 WO 2020172281A1
Authority
WO
WIPO (PCT)
Prior art keywords
wire
shield
shielding wire
conductor
shielding
Prior art date
Application number
PCT/US2020/018835
Other languages
English (en)
Inventor
Joseph Saleh
Wayne Chu
Original Assignee
Fisk Alloy, Inc.
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 Fisk Alloy, Inc. filed Critical Fisk Alloy, Inc.
Publication of WO2020172281A1 publication Critical patent/WO2020172281A1/fr

Links

Classifications

    • 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
    • H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
    • H01B13/26—Sheathing; Armouring; Screening; Applying other protective layers by winding, braiding or longitudinal lapping
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B11/00—Communication cables or conductors
    • H01B11/02—Cables with twisted pairs or quads
    • H01B11/06—Cables with twisted pairs or quads with means for reducing effects of electromagnetic or electrostatic disturbances, e.g. screens
    • H01B11/10—Screens specially adapted for reducing interference from external sources
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B11/00—Communication cables or conductors
    • H01B11/18—Coaxial cables; Analogous cables having more than one inner conductor within a common outer conductor

Definitions

  • the present application relates to shielding of wire and cable conductors.
  • Shielding is used to protect the inner signal of current carrying wire and cable conductors from electro-magnetic interference (EMI), especially radio frequency interference (RFI). Shielding can be accomplished using a conductive material.
  • EMI electro-magnetic interference
  • RFID radio frequency interference
  • Shielding can be accomplished using a conductive material.
  • Typical prior art shields use metallic foil which is wrapped around the insulated conductor or cable, as well as wire or flat wire which can be either braided or served over the insulated conductor or cable.
  • the wire to be protected (shielded) is referred to herein as the“conductor” to distinguish it from“shield(ing) wire” or “shield product.”
  • the shielded cable is then typically covered with a polymeric jacket Shielding wires are typically round, but flat wire has also found wide usage since it can cover a larger surface area while providing weight reductions.
  • An object of this invention is to provide a shield wire and a method for producing this shield wire to save weight while maintaining or improving performance.
  • Shielding wire -of prior art usage is round in cross section and made to various gauge sizes depending on the wire conductor being shielded.
  • NEMA WC 27500 describes standards for round and flat shield strands.
  • Four sizes of round shield strand from 32 AWG to 38 AWG are identified to be used based on the cable core diameter.
  • Flat shield strand is identified as .0015” (1.5 mils) thick in this standard. Width of flat wire varies but it is typically more than .0100”.
  • Round shield wire can be braided (woven) or spiral wound (served) around the insulated conductor or cable. Other round wire diameters or flat wire thicknesses, however, may also be used.
  • Figure 1 Is a sketch of round, elliptical and oval cross sections of shield wire (note a, b, dimension convention);
  • Figure 2 Is a graph of percent (%) weight reduction vs. a/b ratio for elliptical shield wire having the same cross-sectional area as round wire;
  • Figure 3 Is a graph of percent (%) weight reduction vs. a/b ratio for elliptical shield wire having the same width as round wire;
  • Figure 5 Is a photograph of shield coverage using two and three strand carriers of 38 AWG elliptical shield wire having 2:1 aspect ratio;
  • Figure 6 Is a log-log graph of surface transfer impedance for 24 AWG wire shielded with 38 AWG round shield wire;
  • Figure 7 Is a log-log graph of surface transfer impedance for 24 AWG wire shielded with 38 AWG elliptical shield wire;
  • Figure 8 Is a table of typical drawing steps for converting a round wire starting piece to an elliptical shielding wire form.
  • the cross section of the elongated shape may be an ellipse or oval (race track) or any other cross-section elongated form. Examples of ellipse and oval shapes are shown in Figure 1.
  • Ellipse is one of the more efficient shapes for weight reduction.
  • the amount of weight reduction for an ellipse depends on the aspect ratio (a/b ratio).
  • the weight reduction for an elliptical shielding wire having axes a and b and the same cross sectional area as a round wire with the radius r is shown in the formula below where W c is the weight of the round wire and W e is the weight of the elliptical wire both covering surface of the same cable:
  • the weight reduction for an elliptical shield wire relative to a round wire up to an aspect ratio of 4 is graphically illustrated in Figure 2, the greater the aspect ratio the greater the weight reduction.
  • Elliptical shield wire combines the best performance aspects of round and flat shield wire while eliminating the negative aspects of each.
  • Elliptical shield wire can be directly used in standard braiding equipment providing ease of application without needing new equipment and added expense. Similar to wire shielded with round braid, elliptical shielded wire can be easily terminated as compared with flat shield wire. In addition, flat shield wire can form gaps when the wire is flexed, resulting in poor EMI shielding due to leakage whereas elliptical shield wire lays flat and does not create gaps in coverage during flexure.
  • Shielding of electrical cables using round wire is conducted on braiding machines which use a number of carriers. Each carrier has a number of strands (shield wires) wound onto it. Shield coverage as shown by Vance (Ref. I) 1 is:
  • N is the number of wires per carrier
  • d is the diameter of a single shield wire
  • W is the width of coverage provided per carrier including the spacing between carriers as illustrated in Figure 4.
  • N is the number of wires per carrier
  • d is the diameter of a single shield wire
  • W is the width of coverage provided per carrier including the spacing between carriers as illustrated in Figure 4.
  • the length of each individual shield wire per unit length of the cable is dependent on the pitch angle of the weave ( a).
  • Electromagnetic Compatibility Vol. EMC- 17 issue 2 (1975) Resistance, which is directly proportional to the length of the shield wire, can then be adjusted by controlling the pitch angle.
  • Shield hole size is dependent on the percentage of shield coverage, individual shield wire width, number of carriers and number of strands per carrier. Shield effectiveness at high frequencies is related to the hole size. By producing the same or greater coverage using elliptical shield wire, better shielding effectiveness than round shield wire can be achieved.
  • Shielding coverage of wire and cable using elliptical shield wire may be achieved by other methods such as serve, where the shield wire is helically wound around the cable.
  • This invention is applicable to any method of shielding and not limited to only one specific shielding method such as braiding used as an example here.
  • the wire with elongated cross section may be manufactured using a series of drawing dies. These dies start with a round cross section (typical wire drawing die) and successively change the cross section to the desired elongated shape. Using a standard wire drawing machine, reduction of cross section of wire must be incorporated in the shape change to obtain the required shape change and size at finish. This will allow utilization of standard wire drawing equipment without the need to purchase new equipment, if the shield wire specification requires soft (annealed) temper, an in line annealing machine may also be utilized, although not required. Annealing may be conducted as a separate secondary operation. This method of manufacture allows for production of bare or plated product. Shield wire maybe plated with normal conductor plating such as nickel, silver or tin or any other plating as required.
  • the product may be clad with a secondary metal or alloy, e.g., copper clad aluminum or copper clad steel.
  • a secondary metal or alloy e.g., copper clad aluminum or copper clad steel.
  • rolls may be used to roll the shape.
  • rolls are ground with the required shape and the round wire is passed through the roll gap to impart the shape.
  • full shape change may require more than one pass requiring a tandem rolling mill or more than one rolling step.
  • rolling method may be used to process plated or clad wire.
  • elliptical wire with a 2:1 aspect ratio and 38 AWG cross section was produced by drawing through specially designed dies. This wire was wound as two and three strands on bobbins for shielding. Eight each of the two strand and three strand bobbins were loaded in a sixteen carrier braider to braid a 24 AWG insulated conductor wire. Braiding was performed successfully on a standard braiding machine with the strands properly covering greater than 85% of wire surface. Figure 5 shows an example of coverage.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Insulated Conductors (AREA)

Abstract

L'invention concerne un fil électrique et un câble qui sont blindés par des fils de blindage de forme essentiellement elliptique ou ovale pour offrir une protection EMI/RFI efficace avec un poids réduit et des performances améliorées, et la forme du fil de blindage peut être produite avec un équipement de tréfilage et/ou de laminage standard.
PCT/US2020/018835 2019-02-19 2020-02-19 Fil à section transversale allongée pour blindage de conducteur WO2020172281A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201962807444P 2019-02-19 2019-02-19
US62/807,444 2019-02-19

Publications (1)

Publication Number Publication Date
WO2020172281A1 true WO2020172281A1 (fr) 2020-08-27

Family

ID=72144724

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2020/018835 WO2020172281A1 (fr) 2019-02-19 2020-02-19 Fil à section transversale allongée pour blindage de conducteur

Country Status (1)

Country Link
WO (1) WO2020172281A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4641110A (en) * 1984-06-13 1987-02-03 Adams-Russell Company, Inc. Shielded radio frequency transmission cable having propagation constant enhancing means
US6136429A (en) * 1997-03-14 2000-10-24 Daido Tokushukou Kabushiki Kaisha Electromagnetic shielding and wave absorption sheet and the production of the same
US6384337B1 (en) * 2000-06-23 2002-05-07 Commscope Properties, Llc Shielded coaxial cable and method of making same
US6449834B1 (en) * 1997-05-02 2002-09-17 Scilogy Corp. Electrical conductor coils and methods of making same
US6849799B2 (en) * 2002-10-22 2005-02-01 3M Innovative Properties Company High propagation speed coaxial and twinaxial cable
US20150245545A1 (en) * 2014-02-21 2015-08-27 Nexans Braided electromagnetic shielding for cables
US9349508B2 (en) * 2013-06-26 2016-05-24 Hitachi Metals, Ltd. Multi-pair differential signal transmission cable

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4641110A (en) * 1984-06-13 1987-02-03 Adams-Russell Company, Inc. Shielded radio frequency transmission cable having propagation constant enhancing means
US6136429A (en) * 1997-03-14 2000-10-24 Daido Tokushukou Kabushiki Kaisha Electromagnetic shielding and wave absorption sheet and the production of the same
US6449834B1 (en) * 1997-05-02 2002-09-17 Scilogy Corp. Electrical conductor coils and methods of making same
US6384337B1 (en) * 2000-06-23 2002-05-07 Commscope Properties, Llc Shielded coaxial cable and method of making same
US6849799B2 (en) * 2002-10-22 2005-02-01 3M Innovative Properties Company High propagation speed coaxial and twinaxial cable
US9349508B2 (en) * 2013-06-26 2016-05-24 Hitachi Metals, Ltd. Multi-pair differential signal transmission cable
US20150245545A1 (en) * 2014-02-21 2015-08-27 Nexans Braided electromagnetic shielding for cables

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