CA1218715A - Cellulose-free transformer coil structure and method - Google Patents
Cellulose-free transformer coil structure and methodInfo
- Publication number
- CA1218715A CA1218715A CA000434625A CA434625A CA1218715A CA 1218715 A CA1218715 A CA 1218715A CA 000434625 A CA000434625 A CA 000434625A CA 434625 A CA434625 A CA 434625A CA 1218715 A CA1218715 A CA 1218715A
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- Canada
- Prior art keywords
- layers
- coating
- resin
- layer
- metal
- 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
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Abstract
12 50,656 ABSTRACT OF THE DISCLOSURE
A cellulose free transformer coil structure characterized by a tubular coil having a plurality of metal windings having layers of resinous material co-extensive with the windings, and the layers having overlay portions extending over opposite edges of the windings to provide a multi-layered cover having high dielectric breakdown strength.
A cellulose free transformer coil structure characterized by a tubular coil having a plurality of metal windings having layers of resinous material co-extensive with the windings, and the layers having overlay portions extending over opposite edges of the windings to provide a multi-layered cover having high dielectric breakdown strength.
Description
121~3715 1 50,656 CELLULOSE-FREE TRANSFORMER
COIL STRUCTURE AND METHOD
' CRO'SS'-'REFERENCE'TO'RELATED' ~PPLI'C'ATI'ONS
This application is related to Canadian Appli-cation Serial No. 402,669, filed ~ay 11, 1982 in the name of R. D. Buckley, assigned to the same assignee as the present application.
'B'ACKGR~ND'OF'THE'_N~E'NTION
'Fie'l'd o'f''th'e''In'ven't'i'on:
This application relates to a cellulose-free transformer structure and, more particularly, it pertains to multi-layered resinous insulation along edges of coil windings.
'Description'of 'the'Prior''Art:
Although the concept of cellulose-free insulated transformers has been known, it is currently the subject of improvement. As part of the cellulose-free coil con-cept, liquid resin is applied and cured in-situ during coil winding. The concept was preliminarily introduced to benefit the coil structure in the radial direction, that is, reduced radial build of insulation, application of thin films of resin between layers, and reiteration of thin-film resin curing to build up the high-low spaces to result in a ceIlulose-free structure.
~, '7~5
COIL STRUCTURE AND METHOD
' CRO'SS'-'REFERENCE'TO'RELATED' ~PPLI'C'ATI'ONS
This application is related to Canadian Appli-cation Serial No. 402,669, filed ~ay 11, 1982 in the name of R. D. Buckley, assigned to the same assignee as the present application.
'B'ACKGR~ND'OF'THE'_N~E'NTION
'Fie'l'd o'f''th'e''In'ven't'i'on:
This application relates to a cellulose-free transformer structure and, more particularly, it pertains to multi-layered resinous insulation along edges of coil windings.
'Description'of 'the'Prior''Art:
Although the concept of cellulose-free insulated transformers has been known, it is currently the subject of improvement. As part of the cellulose-free coil con-cept, liquid resin is applied and cured in-situ during coil winding. The concept was preliminarily introduced to benefit the coil structure in the radial direction, that is, reduced radial build of insulation, application of thin films of resin between layers, and reiteration of thin-film resin curing to build up the high-low spaces to result in a ceIlulose-free structure.
~, '7~5
2 50,656 SUMMARY OF THE INVENTION
It has been found in accordance with this inven-tion that a more satisfactory transformer coil may be provided which comprises a tubular structure having an inner coating of resinous material, a plurality of first layers of metal windings including an inner layer and outer layer, a first coating of resinous material between the first layer of metal windings, a second coating of resinous material on the outer first layer of metal wind-ings, a plurality of second layers of metal windings onthe second coating of resinous material, a third coating of resinous material between each of the second layers of metal windings, and each of the resinous material includ-ing overlay portions extending over the opposite edges of the metal windings and over the overlay portions of prior-applied coatings of resinous material to provide a multi-layered cover having high dielectric breakdown strength.
The invention also encompasses a method for making a cellulose-free transformer coil comprising the steps of:
(a) providing a winding mandrel for repeated rotation past a resin applicator and a resin curing sta-tion;
(b) applying at least one coating of resin onto the mandrel;
~c) winding a number of layers o~ metal windings spirally onto the coating of resin;
~d) applying a coating of resin onto each layer of metal winding;
(e) applying at least one coating of resin onto the outer layer of the metal winding applied at step (c);
(f) winding at least one layer of an elongated conductor helically onto and across the coatings of resin applied at step (e); and (g) applying a coating of resin onto each turn of each layer of the elongated conductor applied at step (f) with each coating flowing over opposite edges of the layers of prior-applied coatings.
It has been found in accordance with this inven-tion that a more satisfactory transformer coil may be provided which comprises a tubular structure having an inner coating of resinous material, a plurality of first layers of metal windings including an inner layer and outer layer, a first coating of resinous material between the first layer of metal windings, a second coating of resinous material on the outer first layer of metal wind-ings, a plurality of second layers of metal windings onthe second coating of resinous material, a third coating of resinous material between each of the second layers of metal windings, and each of the resinous material includ-ing overlay portions extending over the opposite edges of the metal windings and over the overlay portions of prior-applied coatings of resinous material to provide a multi-layered cover having high dielectric breakdown strength.
The invention also encompasses a method for making a cellulose-free transformer coil comprising the steps of:
(a) providing a winding mandrel for repeated rotation past a resin applicator and a resin curing sta-tion;
(b) applying at least one coating of resin onto the mandrel;
~c) winding a number of layers o~ metal windings spirally onto the coating of resin;
~d) applying a coating of resin onto each layer of metal winding;
(e) applying at least one coating of resin onto the outer layer of the metal winding applied at step (c);
(f) winding at least one layer of an elongated conductor helically onto and across the coatings of resin applied at step (e); and (g) applying a coating of resin onto each turn of each layer of the elongated conductor applied at step (f) with each coating flowing over opposite edges of the layers of prior-applied coatings.
3 50,656 The advantage of the device and method of this invention is that a cellulose-free transformer coil struc-ture is provided which results in dielectric puncture stress, rather than dielectric creep along layer extension surfaces when the transformer coil is operated. The multiple coatings of resin on the edges of the coil layers provide a higher dielectric breakdown strength than the same thickness applied in one layer. Thus, the probabil-ity of a fault transcending the insulation thickness is minimized or rendered unlikely.
BRIEF-DESCRIPTION OF THE DRAWINGS
Figure 1 is a fragmentary sectional view showing layers of conductor windings and coatings of resin there-on; and Fig. 2 is an isometric view schematically illus-trating one manner of forming the coil structure of Fig.
1.
In accordance with this invention a method for making a cellulose-free transformer coil comprises the following steps:
- (a) providing a winding mandrel for repeated rotation past a resin applicator and a resin-curing station;
(b) applying at least one coating of a cross-linkable resin onto the mandrel;
(c) winding a number of layers of metal windings spirally onto the mandrel;
(d) applying a coating of cross-linkable resin onto each layer of metal winding;
(e) applying a number of coatings of said resin onto the layers of metal windings;
(f) winding at least one layer of an elongated conductor helically onto and across the coating of said resin of step (f);
(g) applying at least one additional coating of such resin onto the outer layer of the elongated con-ductor; and 7~S
BRIEF-DESCRIPTION OF THE DRAWINGS
Figure 1 is a fragmentary sectional view showing layers of conductor windings and coatings of resin there-on; and Fig. 2 is an isometric view schematically illus-trating one manner of forming the coil structure of Fig.
1.
In accordance with this invention a method for making a cellulose-free transformer coil comprises the following steps:
- (a) providing a winding mandrel for repeated rotation past a resin applicator and a resin-curing station;
(b) applying at least one coating of a cross-linkable resin onto the mandrel;
(c) winding a number of layers of metal windings spirally onto the mandrel;
(d) applying a coating of cross-linkable resin onto each layer of metal winding;
(e) applying a number of coatings of said resin onto the layers of metal windings;
(f) winding at least one layer of an elongated conductor helically onto and across the coating of said resin of step (f);
(g) applying at least one additional coating of such resin onto the outer layer of the elongated con-ductor; and 7~S
4 50,656 (h) causing each coating of such resin to flow over the opposite edges of the layers of metal windings and of prior-applied coatings of such resin to provide a multi-layered cover on the edges of the coil structure.
In Fig. 1 a transformer coil is generally indi-cated at 3 and has a tubular member formed by applying consecutive coatings of resin and metal windings for con-ductor onto a rotating mandrel 5 about a center line 7.
As the mandrel turns (Fig. 2) in the direction of the arrow 9 it rotates past function station including a resin applicator 11, a winding station 13 for applying con-ductors for winding such as a wire 15 onto the coil 3, and a curing station 17 for curing the resin during rotation of the mandrel through a 360-turn thereof as indicated by the arrow 9. A particular method for making a coil 3 as set forth herein may vary as required.
As shown more particularly in Fig. 1 the coil 3 comprises in the order of their application, the following parts: a coating 19 of resinous material, a plurality of layers 21 of metallic conductors or windings, a coating 23 of resin between each layer 21, a plurality of coatings 25 of resin, layers 27, 29, 31 of metal conductors for wind-ings, coatings 33 of resin between layers 27, 29, coatings 35 of resin between layers 29, 31, and an outer coating 37 of resin. In addition, the transformer coil 3 comprises laminated covers 39, 41 at opposite edges of the several layers and coatings which comprise overlay portions of each coating of resin as it is applied in place.
The coating 19 of resin (Fig. 1) is applied in any suitable manner, such as by spraying, or by use of the resin applicator 11, such as a paint roller. Practically, the coating 19 comprises a plurality o applications applied repetitively in order to cover any holes, voids, or other undesirable contaminants that would reduce the breakdown strength of the overall coating. For that reason a plurality of thin coatings are applied, such as from 5 to 30 coatings with each coating having a thickness ,12,.~t~
50,656 of about 2.0 mils. The coatings are applied spirally by rotating the mandrel 4 with each coating being cured or gelled in place at the curing station 17. The resin is preferably high-temperature, cross-linkable resinous material. For example, it may be a blend of acrylated epoxies, acrylated epoxy novolacs, acrylated hydantoin epoxies, and acrylated urethanes, all dissolved in acrylate monomers which are susceptible to curing by ultraviolet radiation. Each coating of resin may have a thickness of 10 from about 0.0005 to 0.0040 inch, i.e., 5 to 100 turns up to 4 mils thickness per turn. The resin is applied and gelled in one or multiple thin layers depending upon the desired insulating strength.
; Where the layers 21 of windings include a pre-''~' ~ o ~ q insulated surface, the~coating~ ~3, 23 may be omitted.
The curing station 17 may comprise any suitable radiation unit, such as infrared. An ultraviolet radia-tion or electron beam unit has been found satisfactory for this purpose. Ultraviolet radiation appears to be practical.
After application of the coating ~4, the con-- ductor windings or layers 21 are applied. The windings preferably comprise a contiguous strip of metal, such as copper or aluminum. The layers 21 may include an insulat-ing coating, such as an enamel, on the outer surface in which case consecutive turns of the layers may be applied without intervening coatings 23 of resin. Generally, the layers 21 comprise the low-voltage windings of the trans-former coil 3.
After installation of the layers 21 of windings is completed, a plurality of turns of coatings 25, such as from about 5 to 100 turns of up to 4 mils thickness per turn, are applied in a manner similar to the coating 19.
After the requisite number of coatings 25 are 35 applied, the windings 27, 29, 31 are applied. The windings preferably comprise a continuous conductor, such as copper or aluminum, and preferably include an insulating coating, B~7~5 6 50,656 such as enamel. As the mandrel 4 is rotated -the turns of the layer 27 are applied from a strand 15 of wire. The strand advances along and over the outer surface of the insulating coating 25 until it reaches the broken-line position 15a (Fig. 2). As the wire layer 27 is wound in place, the roller 11 for applying the resin advances with the strand to apply a coating 33 of resin onto each turn.
Continued rotation of the assembly causes the first coating 33 to cure as it passes the curing station 17. As the subsequent turn of the winding layer 27 is applied, it is likewise coated with a coating 33 of resin and the previous coating 33 is also covered with the subsequent resinous coatings. Ultimately, the number of resinous coatings 33 equal the number of turns of the winding so that a wedge-shaped insulator is evolved which consists of a pluralityof separately cured coatings 33.
The winding layer 29 is then applied by continu-ing to rotate the mandrel and advance the strand of wire 15 in the direction opposite that applied for the first layer 27. Likewise, the roller advances from the broken-line position 15a with each turn of the wire to apply individual resinous coatings 35 with each coating being cured and subsequently covered with multiple coatings of resin until the strand 15 reaches the left end of the coil as shown in Fig. 1. At this point a wedge-shaped insu-lator comprising a plurality of resinous coatings 35 is completed.
Thereafter, the process similar to that for applying the layer 27 is followed for applying the winding layer 31. Where the layer 31 is the last layer to be applied, an outer coating 37 is applied by the applicator 11. This is accomplished by first applying all turns 31 and then rotating the mandrel 4 ~ith the resin applicator 11 covering all turns to apply resinous coatings 37.
As shown in Fig. 1 the wedge-shaped insulator or coating 33 is tapered with the thicker end being on the left and the thin edge being on the right. Conversely, 73~5 7 50,656 the insulator or resinous coating 35 is oppositely disposed with the thick edge at the right and the thin edge at the left. Inasmuch as the winding layers 27, 29, 31 are high-voltage windings the wedge-shaped coatings 33, 35 are preferred. It is noted, however, that the structure and method of this invention is applicable to coil windings where an intermediate winding layer, such as the layer 29, is not inclined at an angle as shown in Fig. 1, but rather is parallel to the inner and outer layers 27, 31.
In accordance with this invention each time a resinous coating is applied an overlay portion which extends beyond the end of the winding layers flows over the end of the prior-applied core parts. For example, when the winding layer 21 adjacent the resinous coating 19 is applied the resinous coating 23 is applied so that overlay portion at opposite ends of the layer flow over the opposite edges of the layer 21 and onto the resinous coating 19. The next winding layer 21 is similarly coated with another resinous coating 23 with overlay portions likewise flowing downwardly over the opposite end of the winding layer 21 as well as over the previously applied overlay portion of the resin 23.
Similarly, as each resinous coating 25 is ap-plied overlay portions extend over opposite edges of the winding layers and prior-applied coatings of resin 23 to cover the same. As each resinous coating 33 is applied, an overlay portion extends downwardly over prior-applied winding layers 27 as well as overlay portion of the coat-ings 23, 25, as shown by the laminated cover 41. Likewise, as each resinous coating 35 is applied an overlay portion extends downwardly over the end of the coil 3 to cover all prior-applied overlay portions of resinous coatings 23, 25. Finally, the resinous coatings 37 include overlay portions which extend downwardly on both sides as part of the laminated covers 39, 41.
Accordingly, the cellulose-free transformer coil of this invention provides multiple layers of resinous 8t7~5 8 50,656 material at the edges of the coil where higher dielectric breakdown strength is required than is provided by the same thickness of resin applied in one layer. The ad-vantage of multiple layers is that the probability of fault transcending the insulation thickness is minimized or, in fact, nullified. Finally, the multiple layer of resin results in dielectric puncture stress rather than dielectric creep along layer extension surfaces when the transformer coil is operated.
In Fig. 1 a transformer coil is generally indi-cated at 3 and has a tubular member formed by applying consecutive coatings of resin and metal windings for con-ductor onto a rotating mandrel 5 about a center line 7.
As the mandrel turns (Fig. 2) in the direction of the arrow 9 it rotates past function station including a resin applicator 11, a winding station 13 for applying con-ductors for winding such as a wire 15 onto the coil 3, and a curing station 17 for curing the resin during rotation of the mandrel through a 360-turn thereof as indicated by the arrow 9. A particular method for making a coil 3 as set forth herein may vary as required.
As shown more particularly in Fig. 1 the coil 3 comprises in the order of their application, the following parts: a coating 19 of resinous material, a plurality of layers 21 of metallic conductors or windings, a coating 23 of resin between each layer 21, a plurality of coatings 25 of resin, layers 27, 29, 31 of metal conductors for wind-ings, coatings 33 of resin between layers 27, 29, coatings 35 of resin between layers 29, 31, and an outer coating 37 of resin. In addition, the transformer coil 3 comprises laminated covers 39, 41 at opposite edges of the several layers and coatings which comprise overlay portions of each coating of resin as it is applied in place.
The coating 19 of resin (Fig. 1) is applied in any suitable manner, such as by spraying, or by use of the resin applicator 11, such as a paint roller. Practically, the coating 19 comprises a plurality o applications applied repetitively in order to cover any holes, voids, or other undesirable contaminants that would reduce the breakdown strength of the overall coating. For that reason a plurality of thin coatings are applied, such as from 5 to 30 coatings with each coating having a thickness ,12,.~t~
50,656 of about 2.0 mils. The coatings are applied spirally by rotating the mandrel 4 with each coating being cured or gelled in place at the curing station 17. The resin is preferably high-temperature, cross-linkable resinous material. For example, it may be a blend of acrylated epoxies, acrylated epoxy novolacs, acrylated hydantoin epoxies, and acrylated urethanes, all dissolved in acrylate monomers which are susceptible to curing by ultraviolet radiation. Each coating of resin may have a thickness of 10 from about 0.0005 to 0.0040 inch, i.e., 5 to 100 turns up to 4 mils thickness per turn. The resin is applied and gelled in one or multiple thin layers depending upon the desired insulating strength.
; Where the layers 21 of windings include a pre-''~' ~ o ~ q insulated surface, the~coating~ ~3, 23 may be omitted.
The curing station 17 may comprise any suitable radiation unit, such as infrared. An ultraviolet radia-tion or electron beam unit has been found satisfactory for this purpose. Ultraviolet radiation appears to be practical.
After application of the coating ~4, the con-- ductor windings or layers 21 are applied. The windings preferably comprise a contiguous strip of metal, such as copper or aluminum. The layers 21 may include an insulat-ing coating, such as an enamel, on the outer surface in which case consecutive turns of the layers may be applied without intervening coatings 23 of resin. Generally, the layers 21 comprise the low-voltage windings of the trans-former coil 3.
After installation of the layers 21 of windings is completed, a plurality of turns of coatings 25, such as from about 5 to 100 turns of up to 4 mils thickness per turn, are applied in a manner similar to the coating 19.
After the requisite number of coatings 25 are 35 applied, the windings 27, 29, 31 are applied. The windings preferably comprise a continuous conductor, such as copper or aluminum, and preferably include an insulating coating, B~7~5 6 50,656 such as enamel. As the mandrel 4 is rotated -the turns of the layer 27 are applied from a strand 15 of wire. The strand advances along and over the outer surface of the insulating coating 25 until it reaches the broken-line position 15a (Fig. 2). As the wire layer 27 is wound in place, the roller 11 for applying the resin advances with the strand to apply a coating 33 of resin onto each turn.
Continued rotation of the assembly causes the first coating 33 to cure as it passes the curing station 17. As the subsequent turn of the winding layer 27 is applied, it is likewise coated with a coating 33 of resin and the previous coating 33 is also covered with the subsequent resinous coatings. Ultimately, the number of resinous coatings 33 equal the number of turns of the winding so that a wedge-shaped insulator is evolved which consists of a pluralityof separately cured coatings 33.
The winding layer 29 is then applied by continu-ing to rotate the mandrel and advance the strand of wire 15 in the direction opposite that applied for the first layer 27. Likewise, the roller advances from the broken-line position 15a with each turn of the wire to apply individual resinous coatings 35 with each coating being cured and subsequently covered with multiple coatings of resin until the strand 15 reaches the left end of the coil as shown in Fig. 1. At this point a wedge-shaped insu-lator comprising a plurality of resinous coatings 35 is completed.
Thereafter, the process similar to that for applying the layer 27 is followed for applying the winding layer 31. Where the layer 31 is the last layer to be applied, an outer coating 37 is applied by the applicator 11. This is accomplished by first applying all turns 31 and then rotating the mandrel 4 ~ith the resin applicator 11 covering all turns to apply resinous coatings 37.
As shown in Fig. 1 the wedge-shaped insulator or coating 33 is tapered with the thicker end being on the left and the thin edge being on the right. Conversely, 73~5 7 50,656 the insulator or resinous coating 35 is oppositely disposed with the thick edge at the right and the thin edge at the left. Inasmuch as the winding layers 27, 29, 31 are high-voltage windings the wedge-shaped coatings 33, 35 are preferred. It is noted, however, that the structure and method of this invention is applicable to coil windings where an intermediate winding layer, such as the layer 29, is not inclined at an angle as shown in Fig. 1, but rather is parallel to the inner and outer layers 27, 31.
In accordance with this invention each time a resinous coating is applied an overlay portion which extends beyond the end of the winding layers flows over the end of the prior-applied core parts. For example, when the winding layer 21 adjacent the resinous coating 19 is applied the resinous coating 23 is applied so that overlay portion at opposite ends of the layer flow over the opposite edges of the layer 21 and onto the resinous coating 19. The next winding layer 21 is similarly coated with another resinous coating 23 with overlay portions likewise flowing downwardly over the opposite end of the winding layer 21 as well as over the previously applied overlay portion of the resin 23.
Similarly, as each resinous coating 25 is ap-plied overlay portions extend over opposite edges of the winding layers and prior-applied coatings of resin 23 to cover the same. As each resinous coating 33 is applied, an overlay portion extends downwardly over prior-applied winding layers 27 as well as overlay portion of the coat-ings 23, 25, as shown by the laminated cover 41. Likewise, as each resinous coating 35 is applied an overlay portion extends downwardly over the end of the coil 3 to cover all prior-applied overlay portions of resinous coatings 23, 25. Finally, the resinous coatings 37 include overlay portions which extend downwardly on both sides as part of the laminated covers 39, 41.
Accordingly, the cellulose-free transformer coil of this invention provides multiple layers of resinous 8t7~5 8 50,656 material at the edges of the coil where higher dielectric breakdown strength is required than is provided by the same thickness of resin applied in one layer. The ad-vantage of multiple layers is that the probability of fault transcending the insulation thickness is minimized or, in fact, nullified. Finally, the multiple layer of resin results in dielectric puncture stress rather than dielectric creep along layer extension surfaces when the transformer coil is operated.
Claims (11)
1. A cellulose-free transformer coil comprising:
a tubular coil structure having a plurality of first layers of metal windings including an inner layer and an outer layer;
a first coating of resinous material between the first layers of metal windings;
a second coating of resinous material on the outer first layer of metal windings;
a plurality of second layers of metal winding on the second layer of resinous material;
a third coating of resinous material between each of the second layers of metal windings;
each coating of resinous material including overlay portions extending over the opposite edges of the metal windings and over the overlay portions of prior-applied layers of resinous material to provide a multi-layered cover having high dielectric breakdown strength.
a tubular coil structure having a plurality of first layers of metal windings including an inner layer and an outer layer;
a first coating of resinous material between the first layers of metal windings;
a second coating of resinous material on the outer first layer of metal windings;
a plurality of second layers of metal winding on the second layer of resinous material;
a third coating of resinous material between each of the second layers of metal windings;
each coating of resinous material including overlay portions extending over the opposite edges of the metal windings and over the overlay portions of prior-applied layers of resinous material to provide a multi-layered cover having high dielectric breakdown strength.
2. The coil of claim 1 in which there is an initial layer of resinous material within the first layers of metal windings.
3. The coil of claim 2 in which the first layers of metal windings comprise metal strip.
4. The coil of claim 3 in which the second layer of metal winding comprises spirally wound metal wire.
5. The coil of claim 4 in which the resinous material is a blend of acrylated epoxies, acrylated epoxy 50,656 novolacs, acrylated hydantoin epoxies, and acrylated urethanes, all dissolved in acrylate monomers which are susceptible to ultraviolet curing.
6. The coil of claim 4 in which the third layers of resinous material are wedge-shaped bodies having a thin edge at one edge of an adjacent pair of second layers of metal windings and a thick edge at the other edge of said pair of second layers.
7. The coil of claim 6 in which the wedge-shaped bodies on opposite sides of a second layer of metal windings have thin edges disposed in opposite directions.
8. A method for making a cellulose-free trans-former coil comprising the steps of:
(a) providing a winding mandrel for repeated rotation past a resin applicator and a resin curing station;
(b) winding a number of layers of metal wind-ings spirally onto the mandrel;
(c) applying a number of coatings of resin onto the layers of metal windings applied at step (b);
(d) winding at least one layer of an elongated conductor helically onto and across the coatings of resin;
(e) applying at least one additional coating of resin onto the outer layer of the elongated conductor; and (f) causing each coating of resin to flow over the opposite edges of the layers of the metal windings and of prior-applied coat-ings of resin to provide a multi-layered cover on the edges of the coil structure.
(a) providing a winding mandrel for repeated rotation past a resin applicator and a resin curing station;
(b) winding a number of layers of metal wind-ings spirally onto the mandrel;
(c) applying a number of coatings of resin onto the layers of metal windings applied at step (b);
(d) winding at least one layer of an elongated conductor helically onto and across the coatings of resin;
(e) applying at least one additional coating of resin onto the outer layer of the elongated conductor; and (f) causing each coating of resin to flow over the opposite edges of the layers of the metal windings and of prior-applied coat-ings of resin to provide a multi-layered cover on the edges of the coil structure.
9. The method of claim 8 in which at least one coating of resin is applied onto the mandrel prior to step (b).
10. The method of claim 8 in which a coating of resin is applied onto each layer of metal windings applied at step (b).
11 50,656
11 50,656
11. The method of claim 8 in which a coating of resin is applied onto each turn of each layer applied in step (d) with each coating flowing over opposite edges of the layers and prior-applied coatings.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US40968182A | 1982-08-19 | 1982-08-19 | |
| US409,681 | 1982-08-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1218715A true CA1218715A (en) | 1987-03-03 |
Family
ID=23621540
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000434625A Expired CA1218715A (en) | 1982-08-19 | 1983-08-15 | Cellulose-free transformer coil structure and method |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPS5952815A (en) |
| CA (1) | CA1218715A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0691187B2 (en) * | 1987-10-23 | 1994-11-14 | 日本電気株式会社 | Semiconductor device |
| JP2813747B2 (en) * | 1989-05-22 | 1998-10-22 | 富士写真フイルム株式会社 | Image forming method |
| JPH0359653A (en) * | 1989-07-28 | 1991-03-14 | Fuji Photo Film Co Ltd | Image forming method |
-
1983
- 1983-08-15 CA CA000434625A patent/CA1218715A/en not_active Expired
- 1983-08-19 JP JP15043183A patent/JPS5952815A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0211003B2 (en) | 1990-03-12 |
| JPS5952815A (en) | 1984-03-27 |
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