US3783179A - Litz wire for high-frequency coils wound with water-repellent textile fibres - Google Patents

Litz wire for high-frequency coils wound with water-repellent textile fibres Download PDF

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Publication number
US3783179A
US3783179A US00281721A US3783179DA US3783179A US 3783179 A US3783179 A US 3783179A US 00281721 A US00281721 A US 00281721A US 3783179D A US3783179D A US 3783179DA US 3783179 A US3783179 A US 3783179A
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US
United States
Prior art keywords
litz wire
water
percent
strands
enamel
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
US00281721A
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English (en)
Inventor
W Ferber
J Kahnt
G Jost
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.)
US Philips Corp
Original Assignee
US Philips 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 DE19712148057 external-priority patent/DE2148057C3/de
Application filed by US Philips Corp filed Critical US Philips Corp
Application granted granted Critical
Publication of US3783179A publication Critical patent/US3783179A/en
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
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
    • H01B7/282—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable
    • H01B7/2825—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable using a water impermeable sheath
    • 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
    • H01B13/06—Insulating conductors or cables
    • H01B13/12—Insulating conductors or cables by applying loose fibres
    • 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
    • H01B13/30—Drying; Impregnating
    • 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
    • H01B7/04—Flexible cables, conductors, or cords, e.g. trailing cables

Definitions

  • ABSTRACT In high-frequency coils wound from litz wires which each comprise a plurality of strands which each have a diameter of less than 50 ,um, the strands being insulated from one another (enameled) and being wound round with threads consisting of textile fibres, corrosion damage due to defect in the enamel coating are prevented by impregnating the threads with a wetting water-repellent agent which is a thin liquid at room temperature, for example undiluted chemically pure paraffin oil or a mixture of methacrylate, dimerised rosin, Japan wax and enamel petrol, the spaces between the thread layers not being filled with the agent.
  • a wetting water-repellent agent which is a thin liquid at room temperature, for example undiluted chemically pure paraffin oil or a mixture of methacrylate, dimerised rosin, Japan wax and enamel petrol, the spaces between the thread layers not being filled with the agent.
  • the invention relates to a litz wire for high-frequency coils which comprises a plurality of strands which each have a diameter of less than 50 um, are insulated from one another and together are wound round with at least one thread made of textile fibres.
  • Such litz wires are used to wind high-frequency coils of high electric quality.
  • the textile covering ensures the mechanical bond of the litz wire and hence the exact structure of the coils wound from it and on the other hand increases the turns spacing. These two factors determine the electric properties, for example quality and self-capacitance.
  • textile fibres used are silk, artificial silk and cotton.
  • a litz wire wound around with a textile material has the disadvantage that the electrical properties of a coil wound from the litz wire, which in themselve are good, are appreciably impaired by the fact that the textile fibres absorb moisture from the air.
  • This process which in itself is reversible, has the troublesome side effect that especially in industrial regions, in coastal areas and at sea corrosive constituents, such as sulphur compounds and halogen compounds, are absorbed from the air together with the moisture.
  • the advantage of the use of thin strands is offset by the disadvantage of its increased likelihood of faults.
  • a fibre-covered wire for electric conductors it is also known to impregnate a fibre-covered wire for electric conductors to render the covering impermeable to moisture.
  • the impregnating agent may also consist of a mixture of rosin, paraffin, beeswax and resinous oil. Petrol may be used as a solvent (German Patent Specification No. 473,603).
  • weather-proof insulations for electric conductors are known which consist of textile materials rendered weatherproof by impregnation with dried vegetable oils, bitumen and the like (German Patent Specification No. 946,357). It is also known to use methacrylate dispersions as impregnating agents for electrically insulating textile fabrics (Canadian Patent Specification No. 762,540).
  • the high-frequency litz wires of the type mentioned at the beginning of this specification are made up of strands provided with previously applied insulating layers.
  • the invention does not relate to a method of improving and sealing the insulating layers, for the winding of threads round the litz wire braided from insulated strands does not serve as an additional insulation.
  • this covering would have to be as dense as possible, but this would be at variance with the requirements of winding technology.
  • the covering which generally is referred to as open and consists of a single textile thread wound with a pitch such that the litz wires are covered partly only has proved highly satisfactory.
  • a covering of this type provides optimum results in that it hardly impairs the flexibility of the litz wire.
  • the bunch of strands is held together and there is a suffi cient number of spaces in the coil which are filled with air, i.e. with the best dielectric possible.
  • This optimum result obtainable as such is greatly impaired by the hydroscopic properties of the textile fibres, in particular the natural-silk fibres.
  • the water-repellent finishing is obtainable by applying hydrocarbons for example paraffin or waxes, either as such or in the form of solutions or emulsions, or by impregnating with metallic soaps or with paraffin or Wait emulsions containing metallic salts.
  • Hydrophobation is obtained by chemical conversion with the fibre or by the application of synthetic resin derivatives, silicones or fluorine compounds (Ullmann Enzyklopaedie der ischen Chemie, 3rd Edition, Volume 17 (1966) pages 203-207).
  • this is achieved in that the thread made of textile fibres which is used for the covering is impregnated with a, wetting water-repellent agent which is liquid at room temperature, whilst the spaces between the threads are not filled with the agent.
  • a suitable water-repellent agent is an undiluted chemically pure paraffin oil of the type commercially available for spectroscopic purposes, for example liquid paraffin oil Uvasol, article No. 71 16 of the firm of E. Merck, Darmstadt.
  • Japan wax melting point between 45C and 53C.
  • This mixture also improves solderability. It is used at a temperature between 28C and 34C.
  • the water-repellent agent may be mixed with an identification dye.
  • Suitable dyes are, for example, Ceres dyes and Sudan dyes, such as Ceres Blau GN (Farbenfabriken Bayer), and fat dyes, such as Fettrot G (Farbtechnike Hochst).
  • the textile thread or threads may be impregnated either before they are wound around the copper conductors or on completion of the litz wire on the covering machine, but if required it may be effected as a separate step before the operation on the winding machine.
  • FIG. 1 is an elevation of an open covered litz wire comprising six strands
  • FIG. 2 is a cross-sectional view of the litz wire of FIG. 1, the strands being designated by l and the covering threads by 2;
  • FIG. 3 shows a high-frequency coil made from the litz wire according to the invention.
  • a coil former is designated by 3, a main winding by 4 and a coupling winding wound directly on the main winding by 5. The aforementioned potential difference may be produced between the main winding and the coupling winding.
  • the invention provides the following advantages.
  • the agent according to the invention enclosed the individual fibres of the textile thread without causing them to stick together and does not fill the spaces between the turns of the coil, because it is a thin liquid having good wetting properties.
  • Litz wire for high-frequency coils which comprises a plurality of strands which each have a diameter of less than 50 um, are insulated from one another and together are wound around with at least one thread made of textile fibres, characterized in that the textile thread is impregnated with a wetting water-repellent agent which is a thin liquid at room temperature, the spaces between the thread layers not being filled by the agent.
  • Litz wire as claimed in claim 1 characterized in that the thread is impregnated with undiluted chemically pure paraffin oil of the type commercially available for spectroscopic purposes.
  • Litz wire as claimed in claim 1 characterized in that the thread is impregnated with a mixture of from 25 to percent by weight of a 10 percent methacrylate solution in enamel petrol with a boiling range from C to 200C, from 10 to 40 percent by weight of a 10 percent by weight solution of dimerised rosin in enamel petrol, and from 10 to 35 percent by weight of Japan wax with a melting point between 45C and 53C.
  • Litz wire for high-frequency coils comprising a plurality of strands each having a diameter of less than 50 um, said strands being insulated from one another and together beingwound around with at least one' thread made of textile fibres, said textile thread being impregnated with a wetting water-repellent agent which is a thin liquidat room temperature, the spaces between the thread layers not being filled by the agent.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Insulated Conductors (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
  • Coils Or Transformers For Communication (AREA)
US00281721A 1971-09-25 1972-08-18 Litz wire for high-frequency coils wound with water-repellent textile fibres Expired - Lifetime US3783179A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19712148057 DE2148057C3 (de) 1971-09-25 Hochfrequenzlitze für Spulen

Publications (1)

Publication Number Publication Date
US3783179A true US3783179A (en) 1974-01-01

Family

ID=5820622

Family Applications (1)

Application Number Title Priority Date Filing Date
US00281721A Expired - Lifetime US3783179A (en) 1971-09-25 1972-08-18 Litz wire for high-frequency coils wound with water-repellent textile fibres

Country Status (6)

Country Link
US (1) US3783179A (cs)
JP (1) JPS4841253A (cs)
BE (1) BE789246A (cs)
FR (1) FR2153418B1 (cs)
GB (1) GB1391219A (cs)
NL (1) NL7212751A (cs)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6665415B1 (en) * 1999-09-09 2003-12-16 Harman International Industries, Incorporated Loudspeaker overcurrent protection
US20100052668A1 (en) * 2006-12-20 2010-03-04 Koninklijke Philips Electronics N.V. Arrangement and method for influencing and/or detecting magnetic particles in a region of action
RU221746U1 (ru) * 2023-09-29 2023-11-21 Федеральное государственное бюджетное образовательное учреждение высшего образования "Московский государственный университет имени М.В.Ломоносова" (МГУ) Устройство для изготовления литцендрата для обмоток синхронных электрических машин

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2456375A1 (fr) * 1979-05-11 1980-12-05 Cables De Lyon Geoffroy Delore Cable etanche et procede de fabrication
GB9226925D0 (en) * 1992-12-24 1993-02-17 Anglia Electronic Tech Ltd Transformer winding

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1996186A (en) * 1932-10-05 1935-04-02 American Telephone & Telegraph Transmission line conductor
US2479186A (en) * 1946-04-20 1949-08-16 Wigginton Company Voltage tester

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1996186A (en) * 1932-10-05 1935-04-02 American Telephone & Telegraph Transmission line conductor
US2479186A (en) * 1946-04-20 1949-08-16 Wigginton Company Voltage tester

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6665415B1 (en) * 1999-09-09 2003-12-16 Harman International Industries, Incorporated Loudspeaker overcurrent protection
US20100052668A1 (en) * 2006-12-20 2010-03-04 Koninklijke Philips Electronics N.V. Arrangement and method for influencing and/or detecting magnetic particles in a region of action
US8368394B2 (en) * 2006-12-20 2013-02-05 Koninklijke Philips Electronics N.V. Arrangement and method for influencing and/or detecting magnetic particles in a region of action
RU221746U1 (ru) * 2023-09-29 2023-11-21 Федеральное государственное бюджетное образовательное учреждение высшего образования "Московский государственный университет имени М.В.Ломоносова" (МГУ) Устройство для изготовления литцендрата для обмоток синхронных электрических машин
RU2821307C1 (ru) * 2023-11-01 2024-06-20 Федеральное государственное бюджетное образовательное учреждение высшего образования "Московский государственный университет имени М.В.Ломоносова" (МГУ) Установка и способ изготовления литцендрата для обмоток синхронных электрических машин

Also Published As

Publication number Publication date
BE789246A (fr) 1973-03-26
NL7212751A (cs) 1973-03-27
FR2153418B1 (cs) 1978-04-21
JPS4841253A (cs) 1973-06-16
DE2148057B2 (de) 1976-06-10
GB1391219A (en) 1975-04-16
DE2148057A1 (de) 1973-03-29
FR2153418A1 (cs) 1973-05-04

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