CA1077147A - Composite sheet winding for an electromagnetic induction apparatus - Google Patents
Composite sheet winding for an electromagnetic induction apparatusInfo
- Publication number
- CA1077147A CA1077147A CA263,270A CA263270A CA1077147A CA 1077147 A CA1077147 A CA 1077147A CA 263270 A CA263270 A CA 263270A CA 1077147 A CA1077147 A CA 1077147A
- Authority
- CA
- Canada
- Prior art keywords
- winding
- composite
- portions
- sheet
- common
- 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
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/32—Insulating of coils, windings, or parts thereof
- H01F27/323—Insulation between winding turns, between winding layers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2847—Sheets; Strips
Abstract
ABSTRACT OF THE DISCLOSURE
A composite sheet winding for an electromagnetic induction apparatus (such as a transformer) comprises two or more sheet winding portions, spaced apart axially, and wound on a common insulated core. The turns of each winding portion, as well as the winding portions themselves, are insulated from one another by common insulation which extends uninterrupted for the complete axial length of the composite winding.
Electrically insulated conductors located at the radial peripheries of the composite winding connect the start and the finish of each winding portion to the end of the composite winding. Preferably all the insulated conductors exit the composite winding at one common end, and preferably tile winding portions are connected in series to form the composite winding.
A composite sheet winding for an electromagnetic induction apparatus (such as a transformer) comprises two or more sheet winding portions, spaced apart axially, and wound on a common insulated core. The turns of each winding portion, as well as the winding portions themselves, are insulated from one another by common insulation which extends uninterrupted for the complete axial length of the composite winding.
Electrically insulated conductors located at the radial peripheries of the composite winding connect the start and the finish of each winding portion to the end of the composite winding. Preferably all the insulated conductors exit the composite winding at one common end, and preferably tile winding portions are connected in series to form the composite winding.
Description
1~771~7 Case 2508 This invention relates to windings for electro-magnetic induction devices and, more particularly, to electrical sheet windings for use in transformers.
One of the problems encountered in the design of transformers is how to dissipate the heat generated in the sheet winding. The sheet winding is normally employed as the low voltage winding and is located next to the core of the transformer. The high voltage winding is generally a wire wound winding surrounding the low voltage winding.
Because of the compactness of the sheet winding, care must be taken to ensure that it does not overheat. One method Gf ensuring adequate cooling of the sheet winding has been to provide insulated spacers between certain turns of the sheet winding to produce a space for cooling fluid to - circulate between the turns and aid in dissipating the heat produced in the winding. One such type of construction is shown in Canadian Patent 639,271 dated April 3, 1962 to J. Church, L. Rabins and R.J. Ringlee.
This type of construction has the disadvantage that it places some of the turns of the winding further away from the core. To overcome this problem it is ~nown to split the sheet winding into two equal parts. That is, the sheet material is made half the width and is then wound into an upper portion and a lower portion, around the same core, and the t~o portions are insulated from one another. The two portions are then interconnected in series such that they form a composite sheet, winding with the result that more turns are produced without going too far from the core, and the cooling of the winding is enhanced.
One of the problems encountered when the sheet winding is wound in two portions is how to connect the two portions to form a single, composite, series winding. In the prior art this connection has been made in the gap Case 2508 ~ ~077147 occurring between the two portions of the winding. This results in insulation problems at the gap dur to the interconnection and results also in a winding structure that is weakened mechanically.
` Hithertofore the composite sheet winding has been described as having two equal portions. It should be noted, however, that the composite sheet winding can have two or more equal portions.
i The present invention is directed to an improved interconnection between the separate portions of a composite sheet winding. Briefly stated, the present invention comprises the interconnection of two or more separate sheet winding portions, spaced apart along a common axis, into a single composite sheet winding. The sheet winding portions are insulated from one another with insulation extending continuously from end to end, and the start of each portion, as well as the finish of each portion, is brought out to a common end of the composite winding via insulated conductors. The insulated conductors are then interconnected, externally of the composite winding, so as to electrically join the separate winding portions. Such a construction eliminates "cross-overs" in the gaps between the winding portions and : 20 results in a mechanically stronger structure.
Stated in another way, the present invention comprises a composite sheet winding for an electromagnetic induction apparatus, the composite sheet winding comprising: two or more ~` sheet winding portions spaced apart along a common axis and insulated from one another; and insulated conductors connecting the start and the finish of each sheet winding portion to the ; exterior of the composite winding.
Stated yet another way, the present invention comprises a low voltage composite sheet winding for an electromagnetic induction apparatus, the composite sheet spaced apart along a common axis, insualted from one another and having respective start and finish ends, each of the first and second sheet winding portions comprising an elongated sheet of electrically conductive ,, . - ~
~ase 2508 1~77~47 material spirally wound around a common insulated core; the core having an axis coincident with the common axis; electrically insulated conductors extending over portions of the radial peripheries of the composite winding for connecting the start and finish ends of the first and second winding portions to the exterior of the composite sheet winding at a common end therefor; and said first and said second winding portions connected in series at the exterior by an interconnection of the electrically insulated conductor connected to the finish end of the first winding portion with the electrically insulated conductor connected to the start end of the second winding portion.
A preferred embodiment of the invention will now be described with reference to the accompanying drawings in which:
Figure 1 is a simplified schematic of a prior art construction; and Figure 2 is a simplified schematic of a transformer incorporating the present invention.
Figure 1 depicts a simplified prior art construction used in transformers. A conventional core 10 is shown surrounded by a low voltage (LV) composite winding 11 comprised of two sheet winding portions 12 and 13. Each sheet winding portion 12 and 13 is a comprised of a number of turns 14, of a sheet conductive material (such as sheet aluminum). Five turns 14 are shown in each of the portions 12 and 13. Located between the turns 14 are insulators 15 to insulate adjacent turns 14 from one another. An insulated conductor 17 connects the two winding portions 12 and 13 as shown in the Figure. The two portions 12 and 13 are connected in a series circuit relationship in order to provide the composite winding 11 with a larger number of turns and to keep the turns closer to the core 10 ~7~47 Case 2508 than they would be ~therwise. While only two portions 12 and 13 have been shown in Figure 1, mc,re portions could also be ; employed in a similar fashion.
A high voltage ~V) wincling 16 is positioned surrounding the LV winding 11. High voltage winding 16 is a conventional wire wound winding.
With a construction of the type shown in Figure 1 there is a problem providing proper insulation in the space between the portions 12 and 13 due to the interconnection provided by conductor 17. Because the insulators 15 are not continuous in the space between the portions 12 and 13, winding - 11 does not have the mechanical strength it would otherwise have.
- Figure 2 depicts, in simplified form, a construction according to the present invention. A core 20 is shown surrounded by a composite low voltage (LV) winding 21. Composite winding 21 is comprised of sheet winding portions 22, 23, and 24. Each winding portion 22, 23 and 24 is comprised of a number of turns 25, of a sheet conductive material (such as sheet aluminum).
" Five turns 25 are shown in each of the portions 22, 23 and 24.
Located between the turns 25, and continuous throughout the axial length of the composite winding 21, are insulators 26.
Insulators 26 serve to electrically insulate the turns 25 from one another and also provide electrical insulation between the sheet winding portions 22, 23 and 24. Because the insulators 26 are continuous throughout the axial length of the composite winding 21, the mechanical strength of the winding 21 is enhanced O
As can be seen from Fig. 2, insulated conductors 31 to 36 inclusive are used to provide electrical connections to the exterior of composite winding 21 where they are then interconnected as shown to produce a series connection of winding portions 22, 23 and 24. This leaves two remaining Case 2508 ~077147 conductors 36 and 31 which form terminals 28 and 29, being respectively, the start and the finish of the composite low voltage winding 21.
e winding 21 is then surrounded by a high voltage (HV) winding 30. HV winding 30 is any conventional type of wire wound winding.
The foregoing has been a description of the preferred embodiment of the present invention, as envisioned by the inventor. It is to be understood that the device depicted and described in this specification is for one specific application of the invention only, and variations can be made therefrom depending upon the particular application. Accordingly, the device described herein should not be considered as a limitation of the invention in any manner whatsoever, but rather, considered solely as an example for illustrative purposes.
.~. , .
One of the problems encountered in the design of transformers is how to dissipate the heat generated in the sheet winding. The sheet winding is normally employed as the low voltage winding and is located next to the core of the transformer. The high voltage winding is generally a wire wound winding surrounding the low voltage winding.
Because of the compactness of the sheet winding, care must be taken to ensure that it does not overheat. One method Gf ensuring adequate cooling of the sheet winding has been to provide insulated spacers between certain turns of the sheet winding to produce a space for cooling fluid to - circulate between the turns and aid in dissipating the heat produced in the winding. One such type of construction is shown in Canadian Patent 639,271 dated April 3, 1962 to J. Church, L. Rabins and R.J. Ringlee.
This type of construction has the disadvantage that it places some of the turns of the winding further away from the core. To overcome this problem it is ~nown to split the sheet winding into two equal parts. That is, the sheet material is made half the width and is then wound into an upper portion and a lower portion, around the same core, and the t~o portions are insulated from one another. The two portions are then interconnected in series such that they form a composite sheet, winding with the result that more turns are produced without going too far from the core, and the cooling of the winding is enhanced.
One of the problems encountered when the sheet winding is wound in two portions is how to connect the two portions to form a single, composite, series winding. In the prior art this connection has been made in the gap Case 2508 ~ ~077147 occurring between the two portions of the winding. This results in insulation problems at the gap dur to the interconnection and results also in a winding structure that is weakened mechanically.
` Hithertofore the composite sheet winding has been described as having two equal portions. It should be noted, however, that the composite sheet winding can have two or more equal portions.
i The present invention is directed to an improved interconnection between the separate portions of a composite sheet winding. Briefly stated, the present invention comprises the interconnection of two or more separate sheet winding portions, spaced apart along a common axis, into a single composite sheet winding. The sheet winding portions are insulated from one another with insulation extending continuously from end to end, and the start of each portion, as well as the finish of each portion, is brought out to a common end of the composite winding via insulated conductors. The insulated conductors are then interconnected, externally of the composite winding, so as to electrically join the separate winding portions. Such a construction eliminates "cross-overs" in the gaps between the winding portions and : 20 results in a mechanically stronger structure.
Stated in another way, the present invention comprises a composite sheet winding for an electromagnetic induction apparatus, the composite sheet winding comprising: two or more ~` sheet winding portions spaced apart along a common axis and insulated from one another; and insulated conductors connecting the start and the finish of each sheet winding portion to the ; exterior of the composite winding.
Stated yet another way, the present invention comprises a low voltage composite sheet winding for an electromagnetic induction apparatus, the composite sheet spaced apart along a common axis, insualted from one another and having respective start and finish ends, each of the first and second sheet winding portions comprising an elongated sheet of electrically conductive ,, . - ~
~ase 2508 1~77~47 material spirally wound around a common insulated core; the core having an axis coincident with the common axis; electrically insulated conductors extending over portions of the radial peripheries of the composite winding for connecting the start and finish ends of the first and second winding portions to the exterior of the composite sheet winding at a common end therefor; and said first and said second winding portions connected in series at the exterior by an interconnection of the electrically insulated conductor connected to the finish end of the first winding portion with the electrically insulated conductor connected to the start end of the second winding portion.
A preferred embodiment of the invention will now be described with reference to the accompanying drawings in which:
Figure 1 is a simplified schematic of a prior art construction; and Figure 2 is a simplified schematic of a transformer incorporating the present invention.
Figure 1 depicts a simplified prior art construction used in transformers. A conventional core 10 is shown surrounded by a low voltage (LV) composite winding 11 comprised of two sheet winding portions 12 and 13. Each sheet winding portion 12 and 13 is a comprised of a number of turns 14, of a sheet conductive material (such as sheet aluminum). Five turns 14 are shown in each of the portions 12 and 13. Located between the turns 14 are insulators 15 to insulate adjacent turns 14 from one another. An insulated conductor 17 connects the two winding portions 12 and 13 as shown in the Figure. The two portions 12 and 13 are connected in a series circuit relationship in order to provide the composite winding 11 with a larger number of turns and to keep the turns closer to the core 10 ~7~47 Case 2508 than they would be ~therwise. While only two portions 12 and 13 have been shown in Figure 1, mc,re portions could also be ; employed in a similar fashion.
A high voltage ~V) wincling 16 is positioned surrounding the LV winding 11. High voltage winding 16 is a conventional wire wound winding.
With a construction of the type shown in Figure 1 there is a problem providing proper insulation in the space between the portions 12 and 13 due to the interconnection provided by conductor 17. Because the insulators 15 are not continuous in the space between the portions 12 and 13, winding - 11 does not have the mechanical strength it would otherwise have.
- Figure 2 depicts, in simplified form, a construction according to the present invention. A core 20 is shown surrounded by a composite low voltage (LV) winding 21. Composite winding 21 is comprised of sheet winding portions 22, 23, and 24. Each winding portion 22, 23 and 24 is comprised of a number of turns 25, of a sheet conductive material (such as sheet aluminum).
" Five turns 25 are shown in each of the portions 22, 23 and 24.
Located between the turns 25, and continuous throughout the axial length of the composite winding 21, are insulators 26.
Insulators 26 serve to electrically insulate the turns 25 from one another and also provide electrical insulation between the sheet winding portions 22, 23 and 24. Because the insulators 26 are continuous throughout the axial length of the composite winding 21, the mechanical strength of the winding 21 is enhanced O
As can be seen from Fig. 2, insulated conductors 31 to 36 inclusive are used to provide electrical connections to the exterior of composite winding 21 where they are then interconnected as shown to produce a series connection of winding portions 22, 23 and 24. This leaves two remaining Case 2508 ~077147 conductors 36 and 31 which form terminals 28 and 29, being respectively, the start and the finish of the composite low voltage winding 21.
e winding 21 is then surrounded by a high voltage (HV) winding 30. HV winding 30 is any conventional type of wire wound winding.
The foregoing has been a description of the preferred embodiment of the present invention, as envisioned by the inventor. It is to be understood that the device depicted and described in this specification is for one specific application of the invention only, and variations can be made therefrom depending upon the particular application. Accordingly, the device described herein should not be considered as a limitation of the invention in any manner whatsoever, but rather, considered solely as an example for illustrative purposes.
.~. , .
Claims (3)
1. A low voltage composite sheet winding for an electro-magnetic induction apparatus, the composite sheet winding comprising: a first and a second sheet winding portion spaced apart along a common axis, insulated from one another and having respective start and finish ends, each of the first and second sheet winding portions comprising an elongated sheet of electrical-ly conductive material spirally wound around a common insulated core; the core having an axis coincident with the common axis;
electrically insualted conductors extending over portions of the radial peripheries of the composite winding for connecting the start and finish ends of the first and second winding portions to the exterior of the composite sheet winding at a common end therefor; and said first and said second winding portions connected in series at the exterior by an interconnection of the electrically insulated conductor connected to the finish end of the first winding portion with the electrically insulated conductor connected to the start end of the second winding portion.
electrically insualted conductors extending over portions of the radial peripheries of the composite winding for connecting the start and finish ends of the first and second winding portions to the exterior of the composite sheet winding at a common end therefor; and said first and said second winding portions connected in series at the exterior by an interconnection of the electrically insulated conductor connected to the finish end of the first winding portion with the electrically insulated conductor connected to the start end of the second winding portion.
2. The low voltage composite sheet winding of claim 1 wherein the sheet winding further includes a third sheet winding portion spaced apart from the first and second winding portions along the common axis and insulated therefrom, the third winding portion having start and finish ends which are connected by additional electrically insulated conductors extending over portions of the radial peripheries of the composite winding to the exterior of the composite winding at the common end, and the third winding portion connected in series with the second winding portion at the exterior by an interconnection of the electrically insulated conductor connected to the finish end of the second winding portion with the additional electrically insulated conductor connected to the start end of the third winding portion.
3. The low voltage composite sheet winding of claim 1 or 2 wherein the sheet winding portions share common electrical insulation which extends for at least the axial length of the composite winding and is situated between individual turns of the winding portions toinsulate the turns from one another.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA263,270A CA1077147A (en) | 1976-10-13 | 1976-10-13 | Composite sheet winding for an electromagnetic induction apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA263,270A CA1077147A (en) | 1976-10-13 | 1976-10-13 | Composite sheet winding for an electromagnetic induction apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1077147A true CA1077147A (en) | 1980-05-06 |
Family
ID=4107043
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA263,270A Expired CA1077147A (en) | 1976-10-13 | 1976-10-13 | Composite sheet winding for an electromagnetic induction apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1077147A (en) |
-
1976
- 1976-10-13 CA CA263,270A patent/CA1077147A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |