EP0107802A2 - Procédé de fabrication d'un enroulement, en fil ou en ruban, encapsulé dans une résine et matériau d'enroulement employé dans ce procédé - Google Patents

Procédé de fabrication d'un enroulement, en fil ou en ruban, encapsulé dans une résine et matériau d'enroulement employé dans ce procédé Download PDF

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Publication number
EP0107802A2
EP0107802A2 EP83109748A EP83109748A EP0107802A2 EP 0107802 A2 EP0107802 A2 EP 0107802A2 EP 83109748 A EP83109748 A EP 83109748A EP 83109748 A EP83109748 A EP 83109748A EP 0107802 A2 EP0107802 A2 EP 0107802A2
Authority
EP
European Patent Office
Prior art keywords
winding
winding material
wire
material according
casting compound
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.)
Withdrawn
Application number
EP83109748A
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German (de)
English (en)
Other versions
EP0107802A3 (fr
Inventor
Jan Wildeboer
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.)
Smit Transformatoren BV
Original Assignee
Smit Transformatoren BV
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 Smit Transformatoren BV filed Critical Smit Transformatoren BV
Publication of EP0107802A2 publication Critical patent/EP0107802A2/fr
Publication of EP0107802A3 publication Critical patent/EP0107802A3/fr
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
    • H01F41/12—Insulating of windings
    • H01F41/127—Encapsulating or impregnating

Definitions

  • the invention relates to a method for producing a wire or foil winding embedded in a casting compound for transformers, chokes, solenoids or the like.
  • the invention also relates to winding material (wire or foil) for such windings made of a conductive metal, optionally provided with a surface coating insulation.
  • Residual solvents and dirt in the casting compound have a negative effect.
  • the object of the invention is to improve the known method for producing windings embedded in casting compound to the effect that in particular the inhomogeneities based on air inclusions and segregation in the region of the winding surfaces are practically completely avoided.
  • the object of the invention is of equal importance to provide a winding material with which such a method can be carried out in a simple manner.
  • the metallic winding material (wire or foil) intended for the production of the winding is provided in sections or continuously with elevations on a part of its surface, which are distributed uniformly over the length and consist of one material which is resistant to the non-solidified casting compound.
  • the winding material is then processed into a winding and embedded in the solidifying casting compound.
  • the latter process steps are known per se.
  • the distance of the wound material and / or the interstices to be filled with potting compound within the winding can be varied.
  • the elevations can be rolled out of the material of the wires themselves, similar to what is known for so-called concrete finned steels. Ribs of this type are known in manifold modifications. The ribbed wire must be soaked with an insulating varnish before processing.
  • the solution for the invention is made possible in particular for windings with a higher load capacity by a winding material (wire or foil) in which a coating is applied to a part of the surface that is evenly distributed over the length, which causes continuous or section-wise elevations and is made of a material that is not compared to that solidified potting compound is resistant.
  • the elevation-generating coating can consist, for example, of granular, rod-shaped or flaky particles, for example of compact quartz particles or glass fiber flakes, which are non-conductive, so that the actual conductor retains its closed shape.
  • At least one strand of fiber or a ribbon is wound tightly around the winding material. It is advisable to choose the material of these coverings so that both particles and long strands are used so that they are lyophilic compared to the non-solidified casting compound, i. H. attracts the liquid and lets it crawl well to the surfaces.
  • the method according to the invention is suitable for cast resin-impregnated transformers and chokes; however, it is also important for the production of magnet coils that can be measured very precisely, as is required, for example, with superconducting magnets.
  • the method and the winding material make it possible for the bedding material, usually quartz-filled epoxy resin, to flow and crawl along the surface even with tightly wound wires or foils, the elevations keeping a distance between the wires, so that a lead is applied all surface areas to be wetted can be done.
  • the bedding material usually quartz-filled epoxy resin
  • the liquid embedding agent can only penetrate with difficulty into the spaces in the area of the winding layers. Even when casting under vacuum, segregation occurs and voids are formed in the area of the conductor wires and foils. These phenomena are suppressed by a defined distance setting between the conductors with the help of the elevations to be applied to the conductor surfaces. In many cases, additional paint insulation is not necessary.
  • the adhesion between the cast resin mixture and the winding material provided with lacquer insulation is also not always sufficient. Because of the different expansion coefficients of insulating varnish and casting resin, hairline cracks can occur at the interface, which cause inhomogeneities in the dielectric. The omission of the paint insulation therefore brings a significant improvement in the sense of the invention.
  • the criteria for the selection of the material from which the elevations are made are, in particular, the easy wettability (lyophilicity) and heat resistance to the non-solidified casting compound. These criteria allow a large number of different materials to be used to produce the elevations. In terms of price and availability, preference is generally given to a fine, spun glass fiber strand or ribbon. However, it is also possible to use heat-resistant plastics, for example polyterephthalate acid esters or heat-resistant polyamines.
  • the tapes can e.g. B. woven, knitted or made of nonwovens. Instead of glass fibers, for example, glass ceramic, rock or textile fibers can also be used.
  • fiber strands instead of fiber strands, granular, rod-shaped or flaky particles can also be used, non-conductive materials such as quartz grains, fiber flock or the like also being suitable here.
  • the elevations, in particular fiber strands do not completely envelop the wire surface, for example like a silk-wound instrument string, but e.g. B. form a kind of loosely knit stocking, in which surface areas are always free between the individual fiber strands.
  • the occupancy density can of course be varied.
  • a stocking-like sheath is made from a plurality of, preferably two, fiber strands, the fiber strands in each case cross.
  • Figure 1 shows an enlarged view of a winding wire 1
  • the conductive base material is in particular copper or aluminum; other materials are known for the production of superconducting magnetic coils, which have a relatively high jump point.
  • the wire is covered with a thin lacquer insulation 2.
  • stocking-like, evenly distributed over the length two about 0.02 to 0.05 mm thick fiber strands 3 of a glass fiber spun in helical form are periodically crossed or spun around the wire. The larger part of the surface of the wire 1 is left free.
  • the glass fiber strands are heat-resistant and liquid-accepting (lyophilic) with respect to the non-solidified casting compound (epoxy resin with quartz filling as an example), so that a uniform distribution of the flowing casting compound takes place along the fiber strands 3.
  • the non-solidified casting compound epoxy resin with quartz filling as an example
  • Part of the surface of the wire is therefore provided with ridges that are evenly distributed over the length.
  • Figures 2a and 2b show a section through part of the winding. It can be seen that when the wires 1 lie close together, a very dense packing is formed, with the gaps between the wires it is very difficult for the potting material to penetrate. If, on the other hand, the wires 1 are kept at a short distance by elevations (here fiber strands 3), the casting material can penetrate along these fiber strands and the capillaries formed by them without separation.
  • FIG. 3 shows a piece of a flat wire 5 suitable for a winding, which practically has the form of a foil, made of conductive material, for example made of aluminum.
  • This winding material which is made without enamel insulation, should also be embedded in a winding form in an epoxy resin casting compound. It is wrapped helically with two knitted fiber tapes 6, 6 '. The larger part of the wire surface remains free here too.
  • the fiber material of the fiber tapes consists of heat-resistant polyterephtalate acid ethyl ester fiber.
  • the distance a shown in FIG. 3 between adjacent parallel slivers is approximately between one to ten times the covering width b, with measurements being made from the outer edge to the outer edge.
  • the fiber strands have, for example, a diameter of 0.02-0.5 mm, for tapes a thickness of this order of magnitude is selected, the width being between 1 and 4 mm.
  • this information should not be understood as restrictive, but should only give an idea of which dimensions can be selected for common wire diameters (1 - 4 mm).
  • twist length in the exemplary embodiments according to FIGS. 1 and 3 is preferably between 3 and 10 mm if the equipped wire has a diameter between 1 and 4 mm.
  • the twist length is the smallest distance between two points of the stocking-like sheathing of the wire at which they are in the same mutual position, with respect to the wire axis.
  • FIG. 4 shows an embodiment in which elevation-producing coverings are formed from granular or rod-shaped particles 8, which on average are evenly distributed over the surface of the winding material. The distribution takes place, for example, by impregnating a corresponding adhesive suspension with the particles 8 mentioned.
  • the particles can be, for example, compact quartz particles or short-staple fiber flock. They are preferably made of non-conductive material.
  • FIG. 5 shows an exemplary embodiment in which a ribbed wire 9 with wire ribs 10 located on the outside is used, the latter forming the elevations which are distributed uniformly over the length. Because of the resulting relatively strong inhomogeneities on the wire surface, this embodiment is only used for low-power coils or for special designs.
  • short fiber strands 11, which are evenly distributed on the surface ensure the possibility of keeping a distance between the wires in the winding.
  • the winding is carried out in such a way that a smooth wire and a wire with bumps are used in pairs, so that the bumps can only be found on a wire or a foil.
  • This embodiment also makes it possible to solve the invention. In general, it can be said that at least part of the metallic winding material intended for the production of the winding must be provided with elevations on part of its surface in order to produce the inventive effect.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Insulating Of Coils (AREA)
  • Insulating Bodies (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
EP83109748A 1982-10-01 1983-09-29 Procédé de fabrication d'un enroulement, en fil ou en ruban, encapsulé dans une résine et matériau d'enroulement employé dans ce procédé Withdrawn EP0107802A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19823236446 DE3236446A1 (de) 1982-10-01 1982-10-01 Verfahren zur herstellung einer in eine vergussmasse eingebetteten draht- oder folien-wicklung und fuer das verfahren verwendbares wicklungsmaterial
DE3236446 1982-10-01

Publications (2)

Publication Number Publication Date
EP0107802A2 true EP0107802A2 (fr) 1984-05-09
EP0107802A3 EP0107802A3 (fr) 1984-07-25

Family

ID=6174720

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83109748A Withdrawn EP0107802A3 (fr) 1982-10-01 1983-09-29 Procédé de fabrication d'un enroulement, en fil ou en ruban, encapsulé dans une résine et matériau d'enroulement employé dans ce procédé

Country Status (3)

Country Link
EP (1) EP0107802A3 (fr)
JP (1) JPS5998511A (fr)
DE (1) DE3236446A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0172494A1 (fr) * 1984-08-20 1986-02-26 Siemens Aktiengesellschaft Procédé pour la fabrication d'enroulements noyés dans de la résine moulable pour transformateurs
DE102012210802A1 (de) * 2012-06-26 2014-01-02 Siemens Aktiengesellschaft Spulenanordnung und Verfahren zur Herstellung sowie Verwendung der Spulenanordnung mit Kühlung

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3408012A1 (de) 1984-03-05 1985-09-05 Gerhard Dipl.-Ing. Warren Mich. Mesenich Elektromagnetisches einspritzventil

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE856661C (de) * 1949-05-08 1952-11-24 Siemens Ag Verfahren zum Isolieren von elektrischen Spulen
DE1046188B (de) * 1955-12-12 1958-12-11 Licentia Gmbh Freitragende Spule aus hochkant gewickeltem Blankdraht und Verfahren zur Herstellungderselben
FR1501977A (fr) * 1966-09-30 1967-11-18 Alsthom Savoisienne Enroulements en feuilles pour bobines électriques
DE1816127B1 (de) * 1968-12-20 1970-03-12 Matsushita Electric Ind Co Ltd Selbstbindender,oberflaechenisolierter Folienleiter
FR2365867A1 (fr) * 1976-09-22 1978-04-21 Alsthom Savoisienne Bobinages en feuilles metalliques
JPS55110007A (en) * 1979-02-16 1980-08-25 Toshiba Corp Insulating coil
JPS56152225A (en) * 1980-04-25 1981-11-25 Mitsubishi Electric Corp Manufacture of molded coil
CA1180073A (fr) * 1980-05-28 1984-12-27 Richard D. Gibbs Dispositif inducteur a enroulements refroidis par vapeurs
JPS57173921A (en) * 1981-04-21 1982-10-26 Toshiba Corp Resin impregnated molded coil

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0172494A1 (fr) * 1984-08-20 1986-02-26 Siemens Aktiengesellschaft Procédé pour la fabrication d'enroulements noyés dans de la résine moulable pour transformateurs
DE102012210802A1 (de) * 2012-06-26 2014-01-02 Siemens Aktiengesellschaft Spulenanordnung und Verfahren zur Herstellung sowie Verwendung der Spulenanordnung mit Kühlung

Also Published As

Publication number Publication date
DE3236446A1 (de) 1984-04-05
EP0107802A3 (fr) 1984-07-25
JPS5998511A (ja) 1984-06-06

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Inventor name: WILDEBOER, JAN