US3726005A - Method of manufacturing flat-wire field coils - Google Patents
Method of manufacturing flat-wire field coils Download PDFInfo
- Publication number
- US3726005A US3726005A US00125190A US3726005DA US3726005A US 3726005 A US3726005 A US 3726005A US 00125190 A US00125190 A US 00125190A US 3726005D A US3726005D A US 3726005DA US 3726005 A US3726005 A US 3726005A
- Authority
- US
- United States
- Prior art keywords
- coil
- particles
- method defined
- last turn
- thermoplastic
- 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
Links
- 238000004519 manufacturing process Methods 0.000 title abstract description 9
- 239000002245 particle Substances 0.000 claims abstract description 30
- 229920001169 thermoplastic Polymers 0.000 claims abstract description 11
- 239000004416 thermosoftening plastic Substances 0.000 claims abstract description 11
- 239000004922 lacquer Substances 0.000 claims abstract description 10
- 239000000843 powder Substances 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims description 17
- 239000004952 Polyamide Substances 0.000 claims description 4
- 239000003822 epoxy resin Substances 0.000 claims description 4
- 229920002647 polyamide Polymers 0.000 claims description 4
- 229920000647 polyepoxide Polymers 0.000 claims description 4
- 229920006362 Teflon® Polymers 0.000 claims description 3
- 239000004809 Teflon Substances 0.000 claims description 2
- 239000000853 adhesive Substances 0.000 abstract description 7
- 230000001070 adhesive effect Effects 0.000 abstract description 7
- 239000011810 insulating material Substances 0.000 abstract description 7
- 239000002184 metal Substances 0.000 abstract description 6
- 229910052751 metal Inorganic materials 0.000 abstract description 6
- 230000001464 adherent effect Effects 0.000 abstract description 4
- 238000002485 combustion reaction Methods 0.000 abstract description 3
- 229920005989 resin Polymers 0.000 abstract description 3
- 239000011347 resin Substances 0.000 abstract description 3
- 239000007858 starting material Substances 0.000 abstract description 3
- 239000000725 suspension Substances 0.000 abstract description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 238000009413 insulation Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 229910052593 corundum Inorganic materials 0.000 description 2
- 239000010431 corundum Substances 0.000 description 2
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000005686 electrostatic field Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
-
- 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
- H02K3/325—Windings characterised by the shape, form or construction of the insulation for windings on salient poles, such as claw-shaped poles
-
- 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 of manufacturing flat-wire field coils for an electric machine, especially a starter for an internal combustion engine, wherein one metallic surface only of a metal strip is coated with an adhesive lacquer and particles of rigid insulating material are disposed upon this surface and adhere to the adhesive lacquer thereof. Non-adherent particles are removed and the metal strip is coiled so that the adherent particles space apart the successive turns. The last turn is fixed to the coil which is heated and contacted with a suspension of thermoplastic or duroplastic resin powder to form a sheath around the coil. The coil is then bent to the desired shape of the field coil.
- the present invention relates to a method of manufacturing fiat-wire field coils intended to be mounted into electric machines, particularly into starters of intemal-combustion engines.
- the aim of the invention is to avoid these disadvantages and replace the paper insulation by another insulating material, whereby other stages of coil manufacture are also improved.
- this object is achieved in the manner that on its broadside the flat wire is covered by an insulating material preferably of mineral origin, such as quartz (silica), corundum or the like, with particles of a definite thickness of 100, 150 or 200 pm, and these particles are fixed to the flat wire because of a previously applied adhesive.
- the layer of the insulating particles adhering defines the distance between the turns.
- the coil is temperature-resistant, which makes it possible to anneal it by joulean heat after coiling in order to remove the internal stresses arising in the copper wire during coiling.
- Advantageous is electric annealing of a half of the last external turn. Thereby the coil will maintain its shape and the prior systems of fixing the last turn becomes superfluous.
- FIG. 1 shows the application of insulating particles to the fiat wire
- FIG. 2 shows the coil after accomplished coiling, with the fixed last turn
- FIG. 3 shows the coil with the electrodes applied for joulean heating of a half of the last external turn, in order to reduce internal stresses
- FIG. 4 shows the coil after application of the solidifying and insulating sheath
- FIG. 5 is a sectional elevation of the coil before the final fashioning
- FIG. 6 is a sectional elevation of the coil after the final fashioning.
- spacing particles 13 of an insulating mineral material such as quartz (silica), corundum, ceramics, of a definite size of 100, 150 or 200 um are scattered as this is shown in the right part of FIG. 1.
- the particles first impinged adhere to the wire surface while the rest can be removed, e.g., by blowing.
- this spacing insulating layer is applied only to the wire parts of definite and necessary length so that the ends of the coil do not show any insulation.
- Coiling of the coils proceeds according to known methods; for the securing of the last turn there exist two possibilities.
- the last turn can be held by a cord 14 (FIG. 2) having such a heat resistance that it 5 withstands the heating of the coil during its insulation.
- Sheathing of the coil proceeds according to known methods by thermoplastics, preferably polyamides, or by duroplastics, preferably powdery epoxy resins, in a bath with suspended powdery particles or by sprinkling in an electrostatic field or without a field as well as with simultaneous or subsequent sintering and in a given case with additional heat treatment.
- the sheath 20 comprises the coil 21 itself and the leadins 22 without the terminations which must remain non-insulated (FIG. 4).
- the coil is advantageously preheated by joulean heat which renders possible maintenance of the temperature required also during the application of the insulating material of the sheath.
- thermoplastic powders are used, whereby a coil with such a sheathing has only to be cooled down after accomplished sintering. With a proper treatment, the insulating material 20 penetrates deeply between the turns 23 so that the spacing layer 19 is partially impregnated (FIG. 5), whereby a subsequent bending of the coil to the shape required is possible without damage (FIG. 6).
- a method of making a flat-wire field coil for an electric machine comprises the steps of:
- thermoplastic selected from the group which consists of teflon, polyamides and pentones.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacture Of Motors, Generators (AREA)
- Organic Insulating Materials (AREA)
- Insulating Of Coils (AREA)
Abstract
A method of manufacturing flat-wire field coils for an electric machine, especially a starter for an internal combustion engine, wherein one metallic surface only of a metal strip is coated with an adhesive lacquer and particles of rigid insulating material are disposed upon this surface and adhere to the adhesive lacquer thereof. Non-adherent particles are removed and the metal strip is coiled so that the adherent particles space apart the successive turns. The last turn is fixed to the coil which is heated and contacted with a suspension of thermoplastic or duroplastic resin powder to form a sheath around the coil. The coil is then bent to the desired shape of the field coil.
Description
Unite States atent 1191 Prostor Apr. 10, 1973 [54] METHOD OF ACTURING 3,145,127 8 1964 Baun ..29/596 ux FLAT-WIRE FIEL IL 3,418,710 12/1968 Seidel et a1. ....29/605 X 3,440,587 4 1969 Bartos et a]. ..336/206 lnvemori Preston J h Yugoslavla 3,518,755 7 1970 Olson ....29 605 S gn e a La za v Barnum Zdruzenem podjetju Iskra, Kranj, Trzaska c. 2, Ljubljana, Yugoslavia Filed: Mar. 17, 1971 Appl. No.: 125,190
Int. Cl ..H0lf 7/06 Field of Search ..29/605; 174/ 1 1 1,
References Cited UNITED STATES PATENTS 6/1962 Abolins ..l74/1l l X Primary Examiner-Charles W. Lanham Assistant Examiner-Carl E. Hall Att0rneyKarl F. Ross [57] ABSTRACT A method of manufacturing flat-wire field coils for an electric machine, especially a starter for an internal combustion engine, wherein one metallic surface only of a metal strip is coated with an adhesive lacquer and particles of rigid insulating material are disposed upon this surface and adhere to the adhesive lacquer thereof. Non-adherent particles are removed and the metal strip is coiled so that the adherent particles space apart the successive turns. The last turn is fixed to the coil which is heated and contacted with a suspension of thermoplastic or duroplastic resin powder to form a sheath around the coil. The coil is then bent to the desired shape of the field coil.
8 Claim, 6 Drawing Figures PATENTEI] APR 1 [H973 FIG. 4
METHOD OF MANUFACTURING FLAT-WIRE FIELD COlLS l. FIELD OF TI-IE INVENTION The present invention relates to a method of manufacturing fiat-wire field coils intended to be mounted into electric machines, particularly into starters of intemal-combustion engines.
2. BACKGROUND OF THE INVENTION 3. SUMMARY OF THE INVENTION The aim of the invention is to avoid these disadvantages and replace the paper insulation by another insulating material, whereby other stages of coil manufacture are also improved. According to the invention this object is achieved in the manner that on its broadside the flat wire is covered by an insulating material preferably of mineral origin, such as quartz (silica), corundum or the like, with particles of a definite thickness of 100, 150 or 200 pm, and these particles are fixed to the flat wire because of a previously applied adhesive. By the thickness of the particles, the layer of the insulating particles adhering defines the distance between the turns. Due to this insulation the coil is temperature-resistant, which makes it possible to anneal it by joulean heat after coiling in order to remove the internal stresses arising in the copper wire during coiling. Advantageous is electric annealing of a half of the last external turn. Thereby the coil will maintain its shape and the prior systems of fixing the last turn becomes superfluous.
4. DESCRIPTION OF THE INVENTION The method of manufacturing the coil according to the invention will be described in detail with reference to the accompanying drawing, in which:
FIG. 1 shows the application of insulating particles to the fiat wire;
FIG. 2 shows the coil after accomplished coiling, with the fixed last turn;
FIG. 3 shows the coil with the electrodes applied for joulean heating of a half of the last external turn, in order to reduce internal stresses;
FIG. 4 shows the coil after application of the solidifying and insulating sheath;
FIG. 5 is a sectional elevation of the coil before the final fashioning, and
FIG. 6 is a sectional elevation of the coil after the final fashioning.
5. SPECIFIC DESCRIPTION The fiat wire 10 according to FIG. 1, which is still bare in its right part 11, is coated before coiling with a lacquer 12 which adheres well to the wire. Upon the fresh lacquer coating 12 which only serves as adhesive,
Coiling of the coils proceeds according to known methods; for the securing of the last turn there exist two possibilities. First, the last turn can be held by a cord 14 (FIG. 2) having such a heat resistance that it 5 withstands the heating of the coil during its insulation.
On the other hand, it is possible to anneal the coil 18, its external turn 17 or only a part of the external turn by applying two electrodes 15, 16 (FIG. 3), whereby the turns of the coil remain in the required position due to the removal of internal stresses.
By the heat resistance of a coil manufactured by the method according to the invention, the use of powdery insulating materials 19 requiring also high preheating temperatures, such as epoxy resins (up to 230C), polyamides (up to 240400C), pentones (up to 260350C), and teflons (up to 430540C), is rendered possible for solidifying and sheathing the coil.
Sheathing of the coil proceeds according to known methods by thermoplastics, preferably polyamides, or by duroplastics, preferably powdery epoxy resins, in a bath with suspended powdery particles or by sprinkling in an electrostatic field or without a field as well as with simultaneous or subsequent sintering and in a given case with additional heat treatment. The sheath 20 comprises the coil 21 itself and the leadins 22 without the terminations which must remain non-insulated (FIG. 4).
The coil is advantageously preheated by joulean heat which renders possible maintenance of the temperature required also during the application of the insulating material of the sheath. For the insulating sheath, advantageously, thermoplastic powders are used, whereby a coil with such a sheathing has only to be cooled down after accomplished sintering. With a proper treatment, the insulating material 20 penetrates deeply between the turns 23 so that the spacing layer 19 is partially impregnated (FIG. 5), whereby a subsequent bending of the coil to the shape required is possible without damage (FIG. 6).
What we claim is:
l. A method of making a flat-wire field coil for an electric machine, comprises the steps of:
a. continuously coating a single metallic surface of a metal strip with an adhesive lacquer prior to coiling of said strip;
b. continuously dispersing on the lacquer-coated metallic surface rigid insulating particles of a defined particle size ranging between and 200 microns to cause at least some of said particles to adhere to said surface in the form of a layer of adherent particles;
c. thereafter removing nonadherent particles from said surface;
d. winding said metal strip into a coil with said layer of adherent particles interposed between the successive turns;
e. fixing the last of said turns to the remainder of said coil;
f. electrically preheating said coil to a temperature sufficient to cause synthetic resin powder selected from the group which consists of thermoplastic and duroplastic powders to bond to said coil, and contacting said coil with said powder to form a sheath of the resin around said coil; and
g. bending the sheathed coil to a final configuration.
2. The method defined in claim 1 wherein said particles are composed of a thermoplastic and said coil remains unheated following the bonding of the thermoplastic particles to the coil.
3. The method defined in claim 1 wherein said coil is coated with a duroplastic and is heated subsequent to application of the particles of duroplastic to the coil.
4. The method defined in claim 1 wherein said last turn is secured to the remainder of the coil by binding it with a cord.
5. The method defined in claim 1 wherein said last turn is secured to the remainder of said coil by contacting said last turn with a pair of spaced apart electrodes and passing an electric current through said strip to heat said last turn.
6. The method defined in claim 1, further comprising the step of maintaining termini of said strip free from said lacquer and the insulating particles applied in step(b)whereby said termini lie outwardly of said sheath.
7. The method defined in claim 1 wherein the particles applied to said coil are composed of thermoplastic selected from the group which consists of teflon, polyamides and pentones.
8. The method defined in claim 1 wherein the powder applied to said coil is an epoxy resin.
Claims (7)
- 2. The method defined in claim 1 wherein said particles are composed of a thermoplastic and said coil remains unheated following the bonding of the thermoplastic particles to the coil.
- 3. The method defined in claim 1 wherein said coil is coated with a duroplastic and is heated subsequent to application of the particles of duroplastic to the coil.
- 4. The method defined in claim 1 wherein said last turn is secured to the remainder of the coil by binding it with a cord.
- 5. The method defined in claim 1 wherein said last turn is secured to the remainder of said coil by contacting said last turn with a pair of spaced apart electrodes and passing an electric current through said strip to heat said last turn.
- 6. The method defined in claim 1, further comprising the step of maintaining termini of said strip free from said lacquer and the insulating particles applied in step(b)whereby said termini lie outwardly of said sheath.
- 7. The method defined in claim 1 wherein the particles applied to said coil are composed of thermoplastic selected from the group which consists of teflon, polyamides and pentones.
- 8. The method defined in claim 1 wherein the powder applied to said coil is an epoxy resin.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| YU70870 | 1970-03-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3726005A true US3726005A (en) | 1973-04-10 |
Family
ID=25551086
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US00125190A Expired - Lifetime US3726005A (en) | 1970-03-20 | 1971-03-17 | Method of manufacturing flat-wire field coils |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US3726005A (en) |
| DE (1) | DE2032986B2 (en) |
| FR (1) | FR2084962A5 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4433474A (en) | 1981-10-08 | 1984-02-28 | Electric Power Research Institute, Inc. | Amorphous magnetic core and process for manufacturing to improve efficiency |
| US5837940A (en) * | 1995-05-15 | 1998-11-17 | Moncrieff; J. Peter | Conductive surface and method with nonuniform dielectric |
| FR2825535A1 (en) * | 2001-05-31 | 2002-12-06 | Valeo Equip Electr Moteur | Method of fabrication of a rotor for an electric machine, uses wrapping of winding in a fixing material which is melted by an external induction coil, and preheats core to reduce temperature gradient over winding during melting |
| US6544056B1 (en) * | 1998-09-24 | 2003-04-08 | Eads Deutschland Gmbh | Temperature-controlled wire support |
| US6660412B2 (en) * | 2001-03-15 | 2003-12-09 | Waseem A. Roshen | Low loss, high frequency composite magnetic material and methods of making the same |
| US6686822B2 (en) | 2000-04-19 | 2004-02-03 | General Electric Company | Powder coated generator field coils and related method |
| US20150229175A1 (en) * | 2014-02-13 | 2015-08-13 | Sanyo Denki Co., Ltd. | Stator, method for manufacturing stator, and motor |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1751971A (en) * | 1929-10-11 | 1930-03-25 | Acme Wire Company | Process for producing electric coils |
| US3037885A (en) * | 1960-12-27 | 1962-06-05 | Gen Electric | Method of insulating an electrical coil |
| US3145127A (en) * | 1961-06-28 | 1964-08-18 | Gen Electric | Method of insulating electrical components, such as small electric motors |
| US3418710A (en) * | 1963-05-08 | 1968-12-31 | Westinghouse Electric Corp | High temperature magnetic cores and process for producing the same |
| US3440587A (en) * | 1966-02-21 | 1969-04-22 | Dow Corning | Electrical induction apparatus construction |
| US3518755A (en) * | 1967-07-03 | 1970-07-07 | Anaconda Wire & Cable Co | Method of forming electrical coils |
-
1970
- 1970-07-03 DE DE19702032986 patent/DE2032986B2/en active Pending
-
1971
- 1971-03-17 US US00125190A patent/US3726005A/en not_active Expired - Lifetime
- 1971-03-19 FR FR7109886A patent/FR2084962A5/fr not_active Expired
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1751971A (en) * | 1929-10-11 | 1930-03-25 | Acme Wire Company | Process for producing electric coils |
| US3037885A (en) * | 1960-12-27 | 1962-06-05 | Gen Electric | Method of insulating an electrical coil |
| US3145127A (en) * | 1961-06-28 | 1964-08-18 | Gen Electric | Method of insulating electrical components, such as small electric motors |
| US3418710A (en) * | 1963-05-08 | 1968-12-31 | Westinghouse Electric Corp | High temperature magnetic cores and process for producing the same |
| US3440587A (en) * | 1966-02-21 | 1969-04-22 | Dow Corning | Electrical induction apparatus construction |
| US3518755A (en) * | 1967-07-03 | 1970-07-07 | Anaconda Wire & Cable Co | Method of forming electrical coils |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4433474A (en) | 1981-10-08 | 1984-02-28 | Electric Power Research Institute, Inc. | Amorphous magnetic core and process for manufacturing to improve efficiency |
| US5837940A (en) * | 1995-05-15 | 1998-11-17 | Moncrieff; J. Peter | Conductive surface and method with nonuniform dielectric |
| US6544056B1 (en) * | 1998-09-24 | 2003-04-08 | Eads Deutschland Gmbh | Temperature-controlled wire support |
| US6686822B2 (en) | 2000-04-19 | 2004-02-03 | General Electric Company | Powder coated generator field coils and related method |
| US6778053B1 (en) * | 2000-04-19 | 2004-08-17 | General Electric Company | Powder coated generator field coils and related method |
| US6660412B2 (en) * | 2001-03-15 | 2003-12-09 | Waseem A. Roshen | Low loss, high frequency composite magnetic material and methods of making the same |
| FR2825535A1 (en) * | 2001-05-31 | 2002-12-06 | Valeo Equip Electr Moteur | Method of fabrication of a rotor for an electric machine, uses wrapping of winding in a fixing material which is melted by an external induction coil, and preheats core to reduce temperature gradient over winding during melting |
| US20150229175A1 (en) * | 2014-02-13 | 2015-08-13 | Sanyo Denki Co., Ltd. | Stator, method for manufacturing stator, and motor |
| US10312763B2 (en) * | 2014-02-13 | 2019-06-04 | Sanyo Denki Co., Ltd. | Stator, method for manufacturing stator, and motor |
| US10666108B2 (en) | 2014-02-13 | 2020-05-26 | Sanyo Denki Co., Ltd. | Stator, method for manufacturing stator, and motor |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2084962A5 (en) | 1971-12-17 |
| DE2032986A1 (en) | 1971-10-14 |
| DE2032986B2 (en) | 1972-06-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4616407A (en) | Insulating method for rotary electric machine | |
| US4388371A (en) | Self-bonding acrylic polymer overcoat for coated metal substrates | |
| US3726005A (en) | Method of manufacturing flat-wire field coils | |
| JPH03127809A (en) | Manufacture of heat resistant insulated coil | |
| US4392070A (en) | Insulated coil assembly and method of making same | |
| US2718049A (en) | Method of manufacturing bundles of very thin magnetic wires | |
| JP7087833B2 (en) | Manufacturing method of insulated bus bar | |
| US3616389A (en) | Process for producing electrophoretically insulated conductors and coils | |
| DE965707C (en) | Process for the production of metal-coated windings, heating conductors for immersion heaters, hot plates or the like. | |
| TWI644328B (en) | Insulated copper wire and processing method thereof | |
| GB2073500A (en) | Methods of making choke coils or the like | |
| US20040093717A1 (en) | Method for producing a bar-shaped conductor | |
| JPH04112505A (en) | Inorganic insulated coil | |
| JP2005005607A (en) | Process for manufacturing wire wound electronic component | |
| JPS6353819A (en) | Manufacture of flat type insulated wire | |
| JPS6313207A (en) | Superconductive strand | |
| JPS6182612A (en) | Manufacture of flat type insulated wire by electrostatic powder coating | |
| JPS5820132B2 (en) | Coil manufacturing method | |
| JPS59113747A (en) | Insulating method for coil of rotary electric machine | |
| GB1343159A (en) | Method of manufacturing field coils | |
| JPH0578125B2 (en) | ||
| JPH11354316A (en) | Electromagnetic coil and method of manufacturing the same | |
| JPS5920916A (en) | Fusion-bonded wire | |
| JPH0361288B2 (en) | ||
| JPS6120089B2 (en) |