US3866316A - Method for manufacturing an insulated coil - Google Patents

Method for manufacturing an insulated coil Download PDF

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US3866316A
US3866316A US424273A US42427373A US3866316A US 3866316 A US3866316 A US 3866316A US 424273 A US424273 A US 424273A US 42427373 A US42427373 A US 42427373A US 3866316 A US3866316 A US 3866316A
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synthetic resin
substance
string
layer
tape
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US424273A
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Taichi Takechi
Ryozi Kumazawa
Kimikazu Umemoto
Toshimitsu Yamada
Junichi Kamiuchi
Eiji Koyanagi
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Toshiba Corp
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Tokyo Shibaura Electric Co Ltd
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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
    • H01F41/122—Insulating between turns or between winding layers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/12—Impregnating, heating or drying of windings, stators, rotors or machines
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/32—Windings characterised by the shape, form or construction of the insulation
    • H02K3/34—Windings characterised by the shape, form or construction of the insulation between conductors or between conductor and core, e.g. slot insulation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/4902—Electromagnet, transformer or inductor
    • Y10T29/49071—Electromagnet, transformer or inductor by winding or coiling

Definitions

  • ABSTRACT A method for manufacturing an insulated coil comprising the steps of winding an insulating tape layer by layer around a conductor with string-like substances mainly consisting of synthetic resin inserted between the layers of the insulating tape to form a gap therearound, impregnating a synthetic resin between the layers and in the gap, and heating to fuse the synthetic resin of the string-like substance into the impregnated synthetic resin.
  • This invention relates to a method for manufacturing an insulated coil by winding an electrically insulating tape, layer by layer, around a conductor or conductors and impregnating synthetic resin between the layers of the insulated tape.
  • a vacuum/pressure impregnating method comprises winding around a wire coil. layer by layer, an insulating tape, for example, a mica tape, including little or some synthetic resin and, after vacuum treating, pressing synthetic resin to cause it to be impregnated between the layers of the mica tape, and shaping and curing it under pressure.
  • an insulating tape for example, a mica tape
  • synthetic resin is well impregnated between the layers of the tape and it is possible to obtain an insulated coil for relatively high voltage.
  • synthetic resin is not sufficiently impregnated between the layers of the tape and it is impossible to obtain an insulated coil for high voltage.
  • the degree of impregnation of synthetic resin between the layers of the tape is varied by the extent to which the insulated tape is tightly wound, resulting in a poor yield with variation in quality.
  • FIG. 1 is a block diagram schematically showing the steps as involved in manufacturing an insulated coil according to this invention
  • FIG. 2 is a schematic view explaining a method for manufacturing a string-like substance as used in this invention
  • FIG. 3 is a cross-sectional view of the string-like substance
  • FIG. 4 is a schematic view explaining the step of winding an insulating tape around a conductor according to this invention
  • FIG. 5 is a cross-sectional view as taken along line 5--5 of FIG. 4;
  • FIG. 6 is a cross-sectional view schematically showing the state as taken after the tape has been wounded around a conductor
  • FIG. 7 is a cross-sectional view similar to FIG. 6 as taken after a heating treatment has been effected;
  • FIG. 8 is a graphical representation showing a comparison in electrical properties between an insulated coil manufactured according to this invention and an insulated coil manufactured according to the conventional method.
  • FIG. 9 is a schematic view explaining the step of winding an insulating tape around a conductor with a string-like substance inserted between the layers of the tape.
  • An insulating tape is wound layer by layer on a conductor with a string-like substance interposed between the coiled layers of the insulating tape to leave a gap nearby (A, FIG. 1).
  • the coiled conductor is heated at such a temperature that the string-like substance is not fused, while being vacuum treated to evacuate a gap between the coiled layers of the insulating tape and a gap created by the string-like substance (B, FIG. I).
  • This process is effected to permit synthetic resin to be easily impregnated into these gaps during a synthetic resin impregnating process to be later described.
  • This process of B, FIG. I is not essential to the invention.
  • the so vacuum treated coil is impregnated with synthetic resin at a synthetic resin impregnating step (C, FIG.
  • the impregnating process is achieved by introducing a synthetic resin into the coil wound with the insulating tape and applying a predetermined pressure. Then, the impregnated coil is heated to cause the string-like substance to be fused to permit it to be mixed with the impregnated synthetic resin, thereby presenting a shaped coil (D, FIG. 1).
  • the string-like substance may be made entirely of synthetic resin or may be made by coating with synthetic resin a core material such as a glass fiber yarn or natural fiber yarn.
  • Synthetic resin for the string-like substance may be made of a high-molecular-weight solids epoxy resin (commercially available under the trade name of Epikote 1,004, 1,007 etc Shell Chemical Co., Ltd. of bisphenol epichlorohydrines having an epoxy equivalent of 800 to 2,100.
  • the inserting position, inserting state of the string-like substance and the number of string-like substances may be optionally selected.
  • one or several string-like substances may be located between the respective coiled layers of the tape or may be located at a predetermined position between the coiled layers of the tape.
  • a curing agent may not necessarily be included in the string-like substance.
  • the insulating tape may be preliminarily, or to a lesser extent, included with synthetic resin.
  • synthetic resin for the object of this invention there may be used such a type of insulating tape as is well known in this field.
  • a mica tape, glass tape, synthetic resin tape may be normally adopted.
  • a stringlike substance using as a primary component synthetic resin used in this invention is manufactured as shown in FIG. 2. That is, the above-mentioned Epikote having a melting point of about C is heated at 180 to 250C at a heating bath 10 to cause it to be molten. Through the molten synthetic resin bath a core yarn 12 of the order of denier which is made of glass or synthetic resin fiber is passed to cause synthetic resin to be coated around the core yarn. Then, the core yarn coated with synthetic resin 11 is passed through a die 13 having a suitable diameter and it is cooled and dried into a string-like substance 14 having a diameter of about 0.3 to 0.6 mm. The string-like substance consists of the core yarn 12 and an outer layer 11 coated with synthetic resin.
  • reference numeral 15 indicates guide rolls for guiding the core yarn 12 from a bobbin 16 into a molten bath and then to a take-up roll 18, and 17 indicates a guide.
  • a core conductor 20 bent to form a half turn as shown in FIG. 4 is prepared.
  • the core conductor is plurally wound with a mica tape 21 of 0.18 mm in thickness to obtain a 20-layered insulated coil.
  • the string-like substances 14 are sequentially inserted two on each side of the core conductor and between the respective layers of the insulator 21.
  • gaps are created as shown in FIG. 6 (only two gaps are shown) between the layers of the tape.
  • the resultant coil is heated at 80C for 10 hours under vacuum of 0.5 mm Hg for drying and gaps between the tape layers are evacuated.
  • the so vacuum treated coil is introduced into impregnating resin having a viscosity of 5 poises and then pressed for about hours to permit synthetic resin to be impregnated into the above-mentioned gap of the insulating tape. Then, the coil is heated at about 150 to 160C to cause synthetic resin constituting the string-like substance to be fused together with synthetic resin impregnated into the gap of the insulating tape, thereby presenting an integral form. Then, the coil is press-formed into a final shape.
  • a mica tape is wound layer by layer around the conductor with string-like substances inserted between the respective layers of the insulating tape to cause gaps to be positively created between the insulating layers of the coil to permit synthetic resin to be easily filled into these gaps.
  • synthetic resin is filled between the layers of the tape and in the gap.
  • the number of the stringlike substances as well as the material and diameter of the string-like substance may be optimally determined of impregnation and impregnation is completed for these hours.
  • an electrostatic capacitance (prior art) as represented by a curve b shows that no equilibrium state is attained even for 12 hours of impregnation and the electrostatic capacitance as attained for these hours is lower than that of this invention as attained for 6 hours of impregnation.
  • the coil manufactured according to the method of this invention was broken up and observed.
  • the synthetic resin was found to be completely impregnated down to the most inner layer of the mica tape.
  • the synthetic resin so fused together is cured, under the action of a curing agent added therein, to form together with said mica a mechanically strong insulating layer excellent in electrical insulation.
  • the coil is press-formed into an insulating coil, leaving the core of the string-like substance between the insulated layers as shown in FIG. 7. Since the core of the string-like substance is very fine in thickness, i.e., of the order of about 100 denier, no obstacle is encountered in forming an insulated coil. Furthermore, since synthetic resin is also impregnated into the core of the string substance, there is no bad influence on an electrical insulation.
  • FIG. 8 shows the results obtained by measuring the variation A as shown in Table indicates an insulated coil manufactured according to this invention and B as shown in Table denotes an insulated coil manufactured according to the conventional method.
  • tan 8 (percent) of an insulated coil according to this invention is about one fourth that of an insulated coil manufactured according to the conventional method and breakdown voltage is about 1.5 times higher than that of the insulated coil manufactured according to the conventional method.
  • FIG. 9 shows an insulated coil manufactured with string-like substances located in a different position.
  • the string-like substance extends over the different layer of a mica tape during the winding of a mica tape around a core conductor.
  • a mica tape 21 is wound once over the entire extent of a core conductor 20 and rewound up to a position somewhat remote from the end of the core conductor to form a two-layer portion.
  • string-like substances are positioned in a manner that they extend over the two-layered portion and the remaining onelayered portion.
  • the mica tape is again wound over the remaining one-layered portion with the string-like substance inserted therebetween, thus presenting a twolayered coil.
  • the mica tape is further wound over the entire extent of the core conductor to present a three-layered coil. Therefore, one portion of the stringlike substance is positioned between the two-layered portion and three-layered portion, and the remaining portion of the string-like substance is located between one-layered portion and two-layered portion. Likewise, the mica tape is sequentially wound with the string-like substance inserted therebetween. This permits synthetic resin to be easily filled from the outside layer into the inside layer, thus obtaining a good insulated coil at a relatively short impregnation time.
  • a method for manufacturing an insulated coil comprising the steps of winding an insulating tape layer by layer around a conductor with and inserting at least one string-like substance having an outer peripheral synthetic resin layer between the layers of the insulating tape so that a gap is created around the substance between the adjacent layers, impregnating a molten synthetic resin between the layers of the insulating tape and into said gap, and heating the resultant coil to cause the impregnated synthetic resin to be fused together with the outer peripheral synthetic resin layer of the string-like substance to provide an insulated coil.
  • a method according to claim 1 in which said synthetic resin impregnating step comprises dipping the conductor wound with the tape into a synthetic resin and pressing the synthetic resin.

Abstract

A method for manufacturing an insulated coil comprising the steps of winding an insulating tape layer by layer around a conductor with string-like substances mainly consisting of synthetic resin inserted between the layers of the insulating tape to form a gap therearound, impregnating a synthetic resin between the layers and in the gap, and heating to fuse the synthetic resin of the string-like substance into the impregnated synthetic resin.

Description

United States Patent [191 Takechi et al.
[ Feb. 18, 1975 l l METHOD FOR MANUFACTURING AN INSULATED COIL {75] Inventors: Taichi Takechi; Ryozi Kumazawa;
Kimikazu Umemoto; Toshimitsu Yamada; Junichi Kamiuchi, all of Yokohama; Eiji Koyanagi, Fujisawa, all of Japan [731 Assignees: Tokyo Shibaura Electric Co., Ltd.,
Saiwai-ku; Tokyo Shibaura Electric Co., Ltd., Kawasaki shi, both of, Japan [22] Filed: Dec. 13, 1973 [2]] Appl. No.: 424,273
[30] Foreign Application Priority Data Dec. 25. 1972 Japan 47-129310 [52] US. Cl 29/605, 156/56, 174/120 C, 174/120 SR, 310/208, 336/209 [51} Int. Cl. H0lf 7/06 [58] Field of Search 29/605, 602, 596;
174/120 R, 120 C, 120 SR, 121 R, 121 SR; 336/209; 310/208; 156/53, 56
[56] References Cited UNITED STATES PATENTS 2,656,290 10/1953 Bcrberich ct al. 29/605 X 3,470,045 9/1969 Bronnvall ct alt [56/53 3,531,751 9/1970 Sargent 29/605 X 3,556,925 l/l97l Mertens 1. 174/120 C X Primary Examiner-Carl E. Hall Attorney, Agent, or Firm-Oblon, Fisher, Spivak, McCelland & Maier [57] ABSTRACT A method for manufacturing an insulated coil comprising the steps of winding an insulating tape layer by layer around a conductor with string-like substances mainly consisting of synthetic resin inserted between the layers of the insulating tape to form a gap therearound, impregnating a synthetic resin between the layers and in the gap, and heating to fuse the synthetic resin of the string-like substance into the impregnated synthetic resin.
8 Claims, 9 Drawing Figures PATENTEU 3,866.316
SHEET 10F 2 FIG. 1
@fifigme EVACUATION IMPREGNATING MOLDING EQJENTEU F551 8W5 sum '20P 2 FIG. 5
"I'll" Ill!!! .lfll
FIG.7
FlG. 6
FIG.8
b s F O O O O O O O O O O O O O O O O O O 6 5 4 3 2 .1 E3 525653 QFEmoEQHm 1o IMPREGNATING PRESSURE TIME (hr) METHOD FOR MANUFACTURING AN INSULATED COIL This invention relates to a method for manufacturing an insulated coil by winding an electrically insulating tape, layer by layer, around a conductor or conductors and impregnating synthetic resin between the layers of the insulated tape.
As a method for manufacturing an insulated coil for high voltage, a vacuum/pressure impregnating method is known. This method comprises winding around a wire coil. layer by layer, an insulating tape, for example, a mica tape, including little or some synthetic resin and, after vacuum treating, pressing synthetic resin to cause it to be impregnated between the layers of the mica tape, and shaping and curing it under pressure. According to this method, when lesser turns ofthe tape are involved, synthetic resin is well impregnated between the layers of the tape and it is possible to obtain an insulated coil for relatively high voltage. However, where the turns of the insulating tape are increased in an attempt to obtain an insulating coil for even higher voltages, synthetic resin is not sufficiently impregnated between the layers of the tape and it is impossible to obtain an insulated coil for high voltage.
According to the conventional method the degree of impregnation of synthetic resin between the layers of the tape is varied by the extent to which the insulated tape is tightly wound, resulting in a poor yield with variation in quality.
It is accordingly the object of this invention to provide a method of easily manufacturing an insulated coil suitable for use with a high voltage, with little variation in quality and a high yield.
This invention can be more fully understood from the following detailed description when taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a block diagram schematically showing the steps as involved in manufacturing an insulated coil according to this invention;
FIG. 2 is a schematic view explaining a method for manufacturing a string-like substance as used in this invention;
FIG. 3 is a cross-sectional view of the string-like substance;
FIG. 4 is a schematic view explaining the step of winding an insulating tape around a conductor according to this invention,
FIG. 5 is a cross-sectional view as taken along line 5--5 of FIG. 4;
FIG. 6 is a cross-sectional view schematically showing the state as taken after the tape has been wounded around a conductor;
FIG. 7 is a cross-sectional view similar to FIG. 6 as taken after a heating treatment has been effected;
FIG. 8 is a graphical representation showing a comparison in electrical properties between an insulated coil manufactured according to this invention and an insulated coil manufactured according to the conventional method; and
FIG. 9 is a schematic view explaining the step of winding an insulating tape around a conductor with a string-like substance inserted between the layers of the tape.
There will be explained the method for manufacturing an insulated coil according to this invention.
An insulating tape is wound layer by layer on a conductor with a string-like substance interposed between the coiled layers of the insulating tape to leave a gap nearby (A, FIG. 1). The coiled conductor is heated at such a temperature that the string-like substance is not fused, while being vacuum treated to evacuate a gap between the coiled layers of the insulating tape and a gap created by the string-like substance (B, FIG. I). This process is effected to permit synthetic resin to be easily impregnated into these gaps during a synthetic resin impregnating process to be later described. This process of B, FIG. I is not essential to the invention. The so vacuum treated coil is impregnated with synthetic resin at a synthetic resin impregnating step (C, FIG. 1) so that synthetic resin is impregnated into the above-mentioned gaps. The impregnating process is achieved by introducing a synthetic resin into the coil wound with the insulating tape and applying a predetermined pressure. Then, the impregnated coil is heated to cause the string-like substance to be fused to permit it to be mixed with the impregnated synthetic resin, thereby presenting a shaped coil (D, FIG. 1). The string-like substance may be made entirely of synthetic resin or may be made by coating with synthetic resin a core material such as a glass fiber yarn or natural fiber yarn. Synthetic resin for the string-like substance may be made of a high-molecular-weight solids epoxy resin (commercially available under the trade name of Epikote 1,004, 1,007 etc Shell Chemical Co., Ltd. of bisphenol epichlorohydrines having an epoxy equivalent of 800 to 2,100. The inserting position, inserting state of the string-like substance and the number of string-like substances may be optionally selected. For example, one or several string-like substances may be located between the respective coiled layers of the tape or may be located at a predetermined position between the coiled layers of the tape. Where a curing agent is introduced in the impregnating synthetic resin, a curing agent may not necessarily be included in the string-like substance. The insulating tape may be preliminarily, or to a lesser extent, included with synthetic resin. For the object of this invention there may be used such a type of insulating tape as is well known in this field. For example, a mica tape, glass tape, synthetic resin tape may be normally adopted.
Explanation will now be made of the method for manufacturing an insulated coil by reference to the accompanying drawings.
A stringlike substance using as a primary component synthetic resin used in this invention is manufactured as shown in FIG. 2. That is, the above-mentioned Epikote having a melting point of about C is heated at 180 to 250C at a heating bath 10 to cause it to be molten. Through the molten synthetic resin bath a core yarn 12 of the order of denier which is made of glass or synthetic resin fiber is passed to cause synthetic resin to be coated around the core yarn. Then, the core yarn coated with synthetic resin 11 is passed through a die 13 having a suitable diameter and it is cooled and dried into a string-like substance 14 having a diameter of about 0.3 to 0.6 mm. The string-like substance consists of the core yarn 12 and an outer layer 11 coated with synthetic resin. In FIG. 2 reference numeral 15 indicates guide rolls for guiding the core yarn 12 from a bobbin 16 into a molten bath and then to a take- up roll 18, and 17 indicates a guide.
When a coil half turn is manufactured using the string-like substance 14, a core conductor 20 bent to form a half turn as shown in FIG. 4 is prepared. The core conductor is plurally wound with a mica tape 21 of 0.18 mm in thickness to obtain a 20-layered insulated coil. During the winding of the tape the string-like substances 14 are sequentially inserted two on each side of the core conductor and between the respective layers of the insulator 21. As a result, gaps are created as shown in FIG. 6 (only two gaps are shown) between the layers of the tape. The resultant coil is heated at 80C for 10 hours under vacuum of 0.5 mm Hg for drying and gaps between the tape layers are evacuated. The so vacuum treated coil is introduced into impregnating resin having a viscosity of 5 poises and then pressed for about hours to permit synthetic resin to be impregnated into the above-mentioned gap of the insulating tape. Then, the coil is heated at about 150 to 160C to cause synthetic resin constituting the string-like substance to be fused together with synthetic resin impregnated into the gap of the insulating tape, thereby presenting an integral form. Then, the coil is press-formed into a final shape.
According to the method as mentioned above, a mica tape is wound layer by layer around the conductor with string-like substances inserted between the respective layers of the insulating tape to cause gaps to be positively created between the insulating layers of the coil to permit synthetic resin to be easily filled into these gaps. Thus, synthetic resin is filled between the layers of the tape and in the gap. The number of the stringlike substances as well as the material and diameter of the string-like substance may be optimally determined of impregnation and impregnation is completed for these hours. In contrast, an electrostatic capacitance (prior art) as represented by a curve b shows that no equilibrium state is attained even for 12 hours of impregnation and the electrostatic capacitance as attained for these hours is lower than that of this invention as attained for 6 hours of impregnation. The coil manufactured according to the method of this invention was broken up and observed. The synthetic resin was found to be completely impregnated down to the most inner layer of the mica tape. With a coil so manufactured according to the conventional method, synthetic resin was impregnated sufficiently down to the 10th layer of the mica tape and insufficiently down to the 11 to 15th layers of the mica tape, and down to the 16 to 20th layers of the mica tape no synthetic resin was impregnated except for the locations 30 cm apart from each end of the mica tape. The degree to which synthetic resin is impregnated into the mica tape imparts an important influence to electric characteristics.
By way of comparison, experiments were conducted as to the electrical characteristics (tan 6, voltages and breakdown voltages) of an insulated coil as manufactured according to the conventional method. The re-' sults are shown in the following Table.
Table Applied voltage tan 8 Breakdown (KV) 3 6 ll l5 I8 20 voltage (KV/mm) A 0.39 0.40 0.41 0.43 0.45 0.58 0.75 26 to 30 B 0.45 0.55 0.81 1.53 2.31 2.75 3.l0 15 to 20 dependent upon insulation conditions, such as the viscosity of the impregnating synthetic resin, thickness of the insulation (turns of the insulating tape) etc. The impregnating synthetic resin and synthetic resin constituting the stringlike substance are, when heat-treated, fused together with the result that their respective boundaries cease to exist and a unitary structure is obtained. The synthetic resin so fused together is cured, under the action of a curing agent added therein, to form together with said mica a mechanically strong insulating layer excellent in electrical insulation. Thereafter, the coil is press-formed into an insulating coil, leaving the core of the string-like substance between the insulated layers as shown in FIG. 7. Since the core of the string-like substance is very fine in thickness, i.e., of the order of about 100 denier, no obstacle is encountered in forming an insulated coil. Furthermore, since synthetic resin is also impregnated into the core of the string substance, there is no bad influence on an electrical insulation.
An insulation coil was manufactured, by way of comparison, according to the conventional method under the same manufacturing conditions as that of this invention except for the insertion of the string-like sub stance and the length of the impregnation time. FIG. 8 shows the results obtained by measuring the variation A as shown in Table indicates an insulated coil manufactured according to this invention and B as shown in Table denotes an insulated coil manufactured according to the conventional method. As will be understood from Table, at an applied voltage 20V, tan 8 (percent) of an insulated coil according to this invention is about one fourth that of an insulated coil manufactured according to the conventional method and breakdown voltage is about 1.5 times higher than that of the insulated coil manufactured according to the conventional method.
FIG. 9 shows an insulated coil manufactured with string-like substances located in a different position. With this embodiment the string-like substance extends over the different layer of a mica tape during the winding of a mica tape around a core conductor. For example, a mica tape 21 is wound once over the entire extent of a core conductor 20 and rewound up to a position somewhat remote from the end of the core conductor to form a two-layer portion. Then, string-like substances are positioned in a manner that they extend over the two-layered portion and the remaining onelayered portion. The mica tape is again wound over the remaining one-layered portion with the string-like substance inserted therebetween, thus presenting a twolayered coil. Then, the mica tape is further wound over the entire extent of the core conductor to present a three-layered coil. Therefore, one portion of the stringlike substance is positioned between the two-layered portion and three-layered portion, and the remaining portion of the string-like substance is located between one-layered portion and two-layered portion. Likewise, the mica tape is sequentially wound with the string-like substance inserted therebetween. This permits synthetic resin to be easily filled from the outside layer into the inside layer, thus obtaining a good insulated coil at a relatively short impregnation time.
What we claim is:
l. A method for manufacturing an insulated coil, comprising the steps of winding an insulating tape layer by layer around a conductor with and inserting at least one string-like substance having an outer peripheral synthetic resin layer between the layers of the insulating tape so that a gap is created around the substance between the adjacent layers, impregnating a molten synthetic resin between the layers of the insulating tape and into said gap, and heating the resultant coil to cause the impregnated synthetic resin to be fused together with the outer peripheral synthetic resin layer of the string-like substance to provide an insulated coil.
2. A method according to claim 1 in which after the insulating tape is wound around the conductor'the resulting coil is heated at a predetermined temperature for drying while vacuum treated to cause a gap and a space between the tape layers to be evacuated.
3. A method according to claim 2 in which said heating step includes pressing the insulating tape from the outside into a shape.
4. A method according to claim 1 in which said synthetic resin impregnating step comprises dipping the conductor wound with the tape into a synthetic resin and pressing the synthetic resin.
5. A method according to claim 1 in which the stringlike substance has a core yarn made of material different from that of said outer peripheral layer of the string-like substance.
6. A method according to claim 1 in which the stringlike substance has a core yarn made of material the same as that of said outer peripheral layer.
7. A method according to claim 1 in which synthetic resin forming the outer peripheral layer of the stringlike substance is made of the same material as the impregnating synthetic resin.
8. A method according to claim 1 in which the stringlike substance is located between a first and a second layer of said tape along a first portion of said conductor and between said second layer and a third layer of said tape along a second portion of said conductor.

Claims (8)

1. A method for manufacturing an insulated coil, comprising the steps of winding an insulating tape layer by layer around a conductor with and inserting at least one string-like substance having an outer peripheral synthetic resin layer between the layers of the insulating tape so that a gap is created around the substance between the adjacent layers, impregnating a molten synthetic resin between the layers of the insulating tape and into said gap, and heating the resultant coil to cause the impregnated Synthetic resin to be fused together with the outer peripheral synthetic resin layer of the string-like substance to provide an insulated coil.
2. A method according to claim 1 in which after the insulating tape is wound around the conductor the resulting coil is heated at a predetermined temperature for drying while vacuum treated to cause a gap and a space between the tape layers to be evacuated.
3. A method according to claim 2 in which said heating step includes pressing the insulating tape from the outside into a shape.
4. A method according to claim 1 in which said synthetic resin impregnating step comprises dipping the conductor wound with the tape into a synthetic resin and pressing the synthetic resin.
5. A method according to claim 1 in which the string-like substance has a core yarn made of material different from that of said outer peripheral layer of the string-like substance.
6. A method according to claim 1 in which the string-like substance has a core yarn made of material the same as that of said outer peripheral layer.
7. A method according to claim 1 in which synthetic resin forming the outer peripheral layer of the string-like substance is made of the same material as the impregnating synthetic resin.
8. A method according to claim 1 in which the string-like substance is located between a first and a second layer of said tape along a first portion of said conductor and between said second layer and a third layer of said tape along a second portion of said conductor.
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Publication number Priority date Publication date Assignee Title
US4552990A (en) * 1979-12-11 1985-11-12 Asea Aktiebolag Insulated conductor for transformer windings and other inductive apparatus
US4624718A (en) * 1985-11-08 1986-11-25 Essex Group, Inc. Polyester-polyamide tape insulated magnet wire and method of making the same
US6069430A (en) * 1998-02-27 2000-05-30 Hitachi, Ltd. Insulating material and windings thereby
US6504102B2 (en) 1998-02-27 2003-01-07 Hitachi, Ltd. Insulating material, windings using same, and a manufacturing method thereof
US6510358B1 (en) * 1997-10-14 2003-01-21 Siemens Aktiengesellschaft Impregnation process and device for monitoring the impregnation of a carrier material
US20050104252A1 (en) * 2002-01-31 2005-05-19 Hisayuki Hirai Method of manufacturing insulated coil of rotating electric machine and insulated coil
US20050274450A1 (en) * 2004-06-15 2005-12-15 Smith James B Compression of resin impregnated insulating tapes
US20050277351A1 (en) * 2004-06-15 2005-12-15 Siemens Westinghouse Power Corporation Structured resin systems with high thermal conductivity fillers
US20050274540A1 (en) * 2004-06-15 2005-12-15 Smith James D Surface coating of lapped insulation tape
US20060231201A1 (en) * 2005-04-15 2006-10-19 Siemens Power Generation, Inc. Composite insulation tape with loaded HTC materials
US20060234576A1 (en) * 2005-04-15 2006-10-19 Siemens Power Generation, Inc. Patterning on surface with high thermal conductivity materials
US20060280873A1 (en) * 2004-06-15 2006-12-14 Siemens Power Generation, Inc. Seeding of HTC fillers to form dendritic structures
US20060281380A1 (en) * 2005-06-14 2006-12-14 Siemens Power Generation, Inc. Seeding resins for enhancing the crystallinity of polymeric substructures
US20070026221A1 (en) * 2005-06-14 2007-02-01 Siemens Power Generation, Inc. Morphological forms of fillers for electrical insulation
US20070114704A1 (en) * 2005-06-14 2007-05-24 Siemens Power Generation, Inc. Treatment of micropores in mica materials
US20070141324A1 (en) * 2005-04-15 2007-06-21 Siemens Power Generation, Inc. Multi-layered platelet structure
US20080050580A1 (en) * 2004-06-15 2008-02-28 Stevens Gary C High Thermal Conductivity Mica Paper Tape
US20080066942A1 (en) * 2006-09-19 2008-03-20 Siemens Power Generation, Inc. High thermal conductivity dielectric tape
US20080262128A1 (en) * 2005-06-14 2008-10-23 Siemens Power Generation, Inc. Polymer Brushes
US20090238959A1 (en) * 2004-06-15 2009-09-24 Smith James D Fabrics with high thermal conductivity coatings
US7655295B2 (en) 2005-06-14 2010-02-02 Siemens Energy, Inc. Mix of grafted and non-grafted particles in a resin
US20100051317A1 (en) * 2008-08-29 2010-03-04 Pratt & Whitney Canada Corp. Crack controlled resin insulated electrical coil
US7781063B2 (en) 2003-07-11 2010-08-24 Siemens Energy, Inc. High thermal conductivity materials with grafted surface functional groups
US20100239851A1 (en) * 2005-06-14 2010-09-23 Siemens Power Generation, Inc. Nano and meso shell-core control of physical properties and performance of electrically insulating composites
US20100276628A1 (en) * 2004-06-15 2010-11-04 Smith James D Insulation paper with high thermal conductivity materials
US20100311936A1 (en) * 2003-07-11 2010-12-09 James David Blackhall Smith High thermal conductivity materials with grafted surface functional groups
CN102103912A (en) * 2009-12-22 2011-06-22 阿尔斯通技术有限公司 Method for impregnating a high voltage insulation of a winding bar
KR101169489B1 (en) 2004-06-15 2012-07-31 지멘스 에너지, 인코포레이티드 Surface coating of lapped insulation tape
EP2528075A1 (en) * 2011-05-25 2012-11-28 ABB Technology AG Coiling method, coiling device and transformer coil
US8685534B2 (en) 2004-06-15 2014-04-01 Siemens Energy, Inc. High thermal conductivity materials aligned within resins

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Cited By (59)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4552990A (en) * 1979-12-11 1985-11-12 Asea Aktiebolag Insulated conductor for transformer windings and other inductive apparatus
US4624718A (en) * 1985-11-08 1986-11-25 Essex Group, Inc. Polyester-polyamide tape insulated magnet wire and method of making the same
US6510358B1 (en) * 1997-10-14 2003-01-21 Siemens Aktiengesellschaft Impregnation process and device for monitoring the impregnation of a carrier material
US6069430A (en) * 1998-02-27 2000-05-30 Hitachi, Ltd. Insulating material and windings thereby
US6504102B2 (en) 1998-02-27 2003-01-07 Hitachi, Ltd. Insulating material, windings using same, and a manufacturing method thereof
US20050104252A1 (en) * 2002-01-31 2005-05-19 Hisayuki Hirai Method of manufacturing insulated coil of rotating electric machine and insulated coil
US7781063B2 (en) 2003-07-11 2010-08-24 Siemens Energy, Inc. High thermal conductivity materials with grafted surface functional groups
US20100311936A1 (en) * 2003-07-11 2010-12-09 James David Blackhall Smith High thermal conductivity materials with grafted surface functional groups
US8039530B2 (en) 2003-07-11 2011-10-18 Siemens Energy, Inc. High thermal conductivity materials with grafted surface functional groups
US7268293B2 (en) * 2004-06-15 2007-09-11 Siemen Power Generation, Inc. Surface coating of lapped insulation tape
US20050274540A1 (en) * 2004-06-15 2005-12-15 Smith James D Surface coating of lapped insulation tape
US20060280873A1 (en) * 2004-06-15 2006-12-14 Siemens Power Generation, Inc. Seeding of HTC fillers to form dendritic structures
US8685534B2 (en) 2004-06-15 2014-04-01 Siemens Energy, Inc. High thermal conductivity materials aligned within resins
US7837817B2 (en) 2004-06-15 2010-11-23 Siemens Energy, Inc. Fabrics with high thermal conductivity coatings
US8313832B2 (en) 2004-06-15 2012-11-20 Siemens Energy, Inc. Insulation paper with high thermal conductivity materials
US20050274450A1 (en) * 2004-06-15 2005-12-15 Smith James B Compression of resin impregnated insulating tapes
US20100276628A1 (en) * 2004-06-15 2010-11-04 Smith James D Insulation paper with high thermal conductivity materials
US20080050580A1 (en) * 2004-06-15 2008-02-28 Stevens Gary C High Thermal Conductivity Mica Paper Tape
US20050277351A1 (en) * 2004-06-15 2005-12-15 Siemens Westinghouse Power Corporation Structured resin systems with high thermal conductivity fillers
KR101169489B1 (en) 2004-06-15 2012-07-31 지멘스 에너지, 인코포레이티드 Surface coating of lapped insulation tape
US8216672B2 (en) 2004-06-15 2012-07-10 Siemens Energy, Inc. Structured resin systems with high thermal conductivity fillers
US7553438B2 (en) 2004-06-15 2009-06-30 Siemens Energy, Inc. Compression of resin impregnated insulating tapes
US7592045B2 (en) 2004-06-15 2009-09-22 Siemens Energy, Inc. Seeding of HTC fillers to form dendritic structures
US20090238959A1 (en) * 2004-06-15 2009-09-24 Smith James D Fabrics with high thermal conductivity coatings
US7651963B2 (en) 2005-04-15 2010-01-26 Siemens Energy, Inc. Patterning on surface with high thermal conductivity materials
US20060234576A1 (en) * 2005-04-15 2006-10-19 Siemens Power Generation, Inc. Patterning on surface with high thermal conductivity materials
US8277613B2 (en) 2005-04-15 2012-10-02 Siemens Energy, Inc. Patterning on surface with high thermal conductivity materials
US20100108278A1 (en) * 2005-04-15 2010-05-06 Smith James D B Patterning on surface with high thermal conductivity materials
US20100112303A1 (en) * 2005-04-15 2010-05-06 Smith James D B Patterning on surface with high thermal conductivity materials
US7776392B2 (en) 2005-04-15 2010-08-17 Siemens Energy, Inc. Composite insulation tape with loaded HTC materials
US20070141324A1 (en) * 2005-04-15 2007-06-21 Siemens Power Generation, Inc. Multi-layered platelet structure
US7846853B2 (en) 2005-04-15 2010-12-07 Siemens Energy, Inc. Multi-layered platelet structure
US20060231201A1 (en) * 2005-04-15 2006-10-19 Siemens Power Generation, Inc. Composite insulation tape with loaded HTC materials
US20070026221A1 (en) * 2005-06-14 2007-02-01 Siemens Power Generation, Inc. Morphological forms of fillers for electrical insulation
US8383007B2 (en) 2005-06-14 2013-02-26 Siemens Energy, Inc. Seeding resins for enhancing the crystallinity of polymeric substructures
US20100213413A1 (en) * 2005-06-14 2010-08-26 Smith James D B Seeding resins for enhancing the crystallinity of polymeric substructures
US7781057B2 (en) 2005-06-14 2010-08-24 Siemens Energy, Inc. Seeding resins for enhancing the crystallinity of polymeric substructures
US20060281380A1 (en) * 2005-06-14 2006-12-14 Siemens Power Generation, Inc. Seeding resins for enhancing the crystallinity of polymeric substructures
US7851059B2 (en) 2005-06-14 2010-12-14 Siemens Energy, Inc. Nano and meso shell-core control of physical properties and performance of electrically insulating composites
US7955661B2 (en) 2005-06-14 2011-06-07 Siemens Energy, Inc. Treatment of micropores in mica materials
US20100239851A1 (en) * 2005-06-14 2010-09-23 Siemens Power Generation, Inc. Nano and meso shell-core control of physical properties and performance of electrically insulating composites
US8357433B2 (en) 2005-06-14 2013-01-22 Siemens Energy, Inc. Polymer brushes
US20070114704A1 (en) * 2005-06-14 2007-05-24 Siemens Power Generation, Inc. Treatment of micropores in mica materials
US20080262128A1 (en) * 2005-06-14 2008-10-23 Siemens Power Generation, Inc. Polymer Brushes
US7655295B2 (en) 2005-06-14 2010-02-02 Siemens Energy, Inc. Mix of grafted and non-grafted particles in a resin
US7547847B2 (en) 2006-09-19 2009-06-16 Siemens Energy, Inc. High thermal conductivity dielectric tape
US20080066942A1 (en) * 2006-09-19 2008-03-20 Siemens Power Generation, Inc. High thermal conductivity dielectric tape
US7982133B2 (en) 2008-08-29 2011-07-19 Pratt & Whitney Canada Corp. Crack controlled resin insulated electrical coil
US20100051317A1 (en) * 2008-08-29 2010-03-04 Pratt & Whitney Canada Corp. Crack controlled resin insulated electrical coil
US20110147981A1 (en) * 2009-12-22 2011-06-23 Thomas Baumann Method for impregnating a high voltage insulation of a winding bar
CN102103912A (en) * 2009-12-22 2011-06-22 阿尔斯通技术有限公司 Method for impregnating a high voltage insulation of a winding bar
EP2339722A1 (en) * 2009-12-22 2011-06-29 Alstom Technology Ltd Method for impregnating a high voltage insulation of a winding bar
CN102103912B (en) * 2009-12-22 2015-05-20 阿尔斯通再生能源技术公司 Method for impregnating a high voltage insulation of a winding bar
US9246374B2 (en) 2009-12-22 2016-01-26 Alstom Renewable Technologies Method for impregnating a high voltage insulation of a winding bar
WO2012159687A1 (en) * 2011-05-25 2012-11-29 Abb Technology Ag Winding device, winding method, and transformer winding
EP2528075A1 (en) * 2011-05-25 2012-11-28 ABB Technology AG Coiling method, coiling device and transformer coil
CN103843087A (en) * 2011-05-25 2014-06-04 Abb技术有限公司 Winding device, winding method, and transformer winding
US9196407B2 (en) 2011-05-25 2015-11-24 Abb Technology Ag Winding device, winding method, and transformer winding
CN103843087B (en) * 2011-05-25 2017-04-05 Abb技术有限公司 Transformer Winding winding equipment and Transformer Winding

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CA1009938A (en) 1977-05-10
BR7310099D0 (en) 1974-08-15
JPS4985600A (en) 1974-08-16
JPS5232062B2 (en) 1977-08-19
AU6347873A (en) 1975-06-12

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