CA1075783A - Air choke coil with conductor cross-over structure - Google Patents
Air choke coil with conductor cross-over structureInfo
- Publication number
- CA1075783A CA1075783A CA265,392A CA265392A CA1075783A CA 1075783 A CA1075783 A CA 1075783A CA 265392 A CA265392 A CA 265392A CA 1075783 A CA1075783 A CA 1075783A
- Authority
- CA
- Canada
- Prior art keywords
- air
- choke coil
- conductor
- crossing
- winding parts
- 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
- H01F37/00—Fixed inductances not covered by group H01F17/00
- H01F37/005—Fixed inductances not covered by group H01F17/00 without magnetic core
-
- 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
- H01F27/2823—Wires
- H01F27/2828—Construction of conductive connections, of leads
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Coils Of Transformers For General Uses (AREA)
- Coils Or Transformers For Communication (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
An air-choke coil having at least two concentric wind-ings, or winding parts, in which the windings, or winding parts, are crossed over. Known similar coils are usually provided with a plurality of parallel, current-carrying wires forming the conductor. The use of a plurality of conductors substantially reduces unwanted losses and heating produced by eddy currents and the like. In such air-choke coils uniform distribution of the current to a plurality of parallel conductors is usually achieved by means of the so-called cross-over technique. The air-choke coil according to the present invention is sub-stantially simpler in construction in that the windings, or winding parts, need not be wound simultaneously, as in the case of known similar constructions. The coil comprises at least two concentric windings, or winding parts, in which the windings, or winding parts, are crossed. A separate crossing piece is provided for the purpose of crossing the conductor cables. In one embodiment the crossing piece is in the form of a flat web with a connecting piece at each end for connect-ing conductor cables thereto.
An air-choke coil having at least two concentric wind-ings, or winding parts, in which the windings, or winding parts, are crossed over. Known similar coils are usually provided with a plurality of parallel, current-carrying wires forming the conductor. The use of a plurality of conductors substantially reduces unwanted losses and heating produced by eddy currents and the like. In such air-choke coils uniform distribution of the current to a plurality of parallel conductors is usually achieved by means of the so-called cross-over technique. The air-choke coil according to the present invention is sub-stantially simpler in construction in that the windings, or winding parts, need not be wound simultaneously, as in the case of known similar constructions. The coil comprises at least two concentric windings, or winding parts, in which the windings, or winding parts, are crossed. A separate crossing piece is provided for the purpose of crossing the conductor cables. In one embodiment the crossing piece is in the form of a flat web with a connecting piece at each end for connect-ing conductor cables thereto.
Description
"" 1075783 The invention relates to an air-choke coil having at least two concentric windings, or winding parts, in which the windings, or winding parts, are crossed over.
Known air-choke coils are usually provided, not with one, but with a plurality of parallel, current-carrying wires forming the conductor. This use of a plurality of conductor~
reduces to a minimum unwanted losses and heating produced by eddy currents and the like. Furthermore, the very large conductor diameters required by single-wire conductors are unacceptable from a mechanical point of view.
In the case of air-choke coils having at least two concentric windings, or winding parts, with the same number of turns, the alternating-current impedance of the one conductor is considerably lower than that of the other conductor. The result of this is that most of the current flows through the conductor having the lower impedance, thus causing excessive heating and possible overloading.
In the case of air-choke coils, uniform distribution of the current to a plurality of parallel conductors is usually achieved by means of the so-called cross-over technique, already described in United States Patent No. 1,554,250, Woodrow, issued September 22, 1925.
In coils having large conductor cross-sections, the crossing of the conductors takes up a considerable amount of space, and the conductors also have to be off-set or otherwise deformed. This i8 a disadvantage, since the production of such conductors is time-consuming and, where large currents are involved, the extensive assembly required also ta~es up a con-siderable amount of space. Another problem in producing chokes with cro~9ed conductors is that all of the conductors must be wound simultaneously, and crossed, about a common axis.
It is the purpose of the invention to provide an air--~ choke coil of the type mentioned at the beginning hereof which ~ .
~ .
lacks the disadvantages of known designs and in which the crossing of the conductor cables is substantially simplified.
In accordance with a specific embodiment of the invention there is provided an air-choke coil having at least two concentric windings or winding parts and in which the said windings or winding parts are crossedj characterized in that a separate crossing piece is provided for the purpose of crossing the conductor cablesO
m e main advantage of the invention is to be perceived in that in the case of air-choke coils having a plurality of concentric windings or winding parts the winding operation is substantially simpler and the windings, or winding parts need no longer be wound simultaneously.
The crossing piece is preferably in the form of a flat web with a connectlng piece for the conductor cables at each end.
As a result of this only a smal-l amount of space is needed for the crossing piece between the conductor cables. Cubic form connecting pieces having an opening accommodating the end of one conductor cable are particularly suitable as connecting pieces.
The cross-section of the web is preferably at least as large as that of the conductor cable, so that the ohmic resistance of the crossing piece is no higher than that of an equal length of the conductor cable. m e crossing piece is preferably made of the same material as the conductor cable. In order to avoid contact resistances between the conductor cables and the crossing pieces - it is desirable to weld the ends of the conductors to the connect- - -ing pieces of the crossing piece. m is makes it possible to wind ... . .
the coil under tension without any danger of the conductor cable being pulled out of the crossing pieceO For reasons of safety an insulating interlayer is inserted between the cross conductors and the crossing piece. Spacer strips are preferably used to space the coils. Impregnating or gluing is preferably carried out - ~ by immersing the coil in an epoxy resin which hardens later.
. . - - . - , . . . ~
.' . ; ' ' , ~ . ' :. . ' ~
~07S7~3~
In a drawing of one embodiment of the present invention:
Fig. 1 is a side elevation of two conductor cables in an air-choke coil crossed over by means of a crossing piece, and Fig. 2 is a bottom plan view of the arrangement accord-ing to Fig. 1.
In Fig. 1, a crossing piece 2, made of an electrically-conducting material, is located above a conductor cable 1. The crossing piece consists of a flat web 3 having a connecting piece 4, 4* in the form of a cube situated at each end thereof. Each of the connecting pieces is provided with a bore to accommodate the ends of a second conductor cable 5, 5*.
As may be gathered from Fig. 2, conductor cable 1 is bent slightly in the shape of an S and crossing piece 2 is located directly above this S-bend. Running parallel with conductor cable 1 is a second conductor cable 5, 5* which is cut at the location of the S-bend in conductor cable 1. Ends 6, 6* of conductor cable 5, -5* are inserted into the bores of cube-shaped connecting pieces 4, 4*, to which they are welded.
A spacer strip 7 is arranged between conductor cables 1 and 5.
The air-choke coil is preferably produced as follows:
the conductor for the first coil, beginning in the inside, is wound as far as the first cross-over location, the crossing piece is secured to the conductor cable, spacing means are fitted to the outside of the coil part; the next coil is then wound thereover as far as the cross-over location and is wound further with the radius of the preceding coil as far as the next cross-over location, a crossing piece is secured to the conductor cable of the second coil, spacing means are again fitted, and the ~-; 30 procedure applied to the second coil is repeated for each sub-sequent coil, but the last coil is not fitted with a crossing piece, a conductor cable is secured to the crossing piece of the first coil, and winding proceeds under tension, to the end of the 10757~;~
coil. This sequence of operations is repeated for the remainingcoils, and the whole air-choke coil is finally impregnated or glued.
The air-choke coil according to the invention not only has the advantage of eliminating the complex winding operation associated with air-choke coils having a plurality of concentric windings, or winding parts, and also the simultaneous winding of a plurality of coils, but also makes it possible to carry out the cross-overs without losing valuable winding space. Furthermore, off-sets and other deformations are no longer necessary. By means of the crossing piece described above, air-choke coils may be produced with any desired number of concentric windings.
Known air-choke coils are usually provided, not with one, but with a plurality of parallel, current-carrying wires forming the conductor. This use of a plurality of conductor~
reduces to a minimum unwanted losses and heating produced by eddy currents and the like. Furthermore, the very large conductor diameters required by single-wire conductors are unacceptable from a mechanical point of view.
In the case of air-choke coils having at least two concentric windings, or winding parts, with the same number of turns, the alternating-current impedance of the one conductor is considerably lower than that of the other conductor. The result of this is that most of the current flows through the conductor having the lower impedance, thus causing excessive heating and possible overloading.
In the case of air-choke coils, uniform distribution of the current to a plurality of parallel conductors is usually achieved by means of the so-called cross-over technique, already described in United States Patent No. 1,554,250, Woodrow, issued September 22, 1925.
In coils having large conductor cross-sections, the crossing of the conductors takes up a considerable amount of space, and the conductors also have to be off-set or otherwise deformed. This i8 a disadvantage, since the production of such conductors is time-consuming and, where large currents are involved, the extensive assembly required also ta~es up a con-siderable amount of space. Another problem in producing chokes with cro~9ed conductors is that all of the conductors must be wound simultaneously, and crossed, about a common axis.
It is the purpose of the invention to provide an air--~ choke coil of the type mentioned at the beginning hereof which ~ .
~ .
lacks the disadvantages of known designs and in which the crossing of the conductor cables is substantially simplified.
In accordance with a specific embodiment of the invention there is provided an air-choke coil having at least two concentric windings or winding parts and in which the said windings or winding parts are crossedj characterized in that a separate crossing piece is provided for the purpose of crossing the conductor cablesO
m e main advantage of the invention is to be perceived in that in the case of air-choke coils having a plurality of concentric windings or winding parts the winding operation is substantially simpler and the windings, or winding parts need no longer be wound simultaneously.
The crossing piece is preferably in the form of a flat web with a connectlng piece for the conductor cables at each end.
As a result of this only a smal-l amount of space is needed for the crossing piece between the conductor cables. Cubic form connecting pieces having an opening accommodating the end of one conductor cable are particularly suitable as connecting pieces.
The cross-section of the web is preferably at least as large as that of the conductor cable, so that the ohmic resistance of the crossing piece is no higher than that of an equal length of the conductor cable. m e crossing piece is preferably made of the same material as the conductor cable. In order to avoid contact resistances between the conductor cables and the crossing pieces - it is desirable to weld the ends of the conductors to the connect- - -ing pieces of the crossing piece. m is makes it possible to wind ... . .
the coil under tension without any danger of the conductor cable being pulled out of the crossing pieceO For reasons of safety an insulating interlayer is inserted between the cross conductors and the crossing piece. Spacer strips are preferably used to space the coils. Impregnating or gluing is preferably carried out - ~ by immersing the coil in an epoxy resin which hardens later.
. . - - . - , . . . ~
.' . ; ' ' , ~ . ' :. . ' ~
~07S7~3~
In a drawing of one embodiment of the present invention:
Fig. 1 is a side elevation of two conductor cables in an air-choke coil crossed over by means of a crossing piece, and Fig. 2 is a bottom plan view of the arrangement accord-ing to Fig. 1.
In Fig. 1, a crossing piece 2, made of an electrically-conducting material, is located above a conductor cable 1. The crossing piece consists of a flat web 3 having a connecting piece 4, 4* in the form of a cube situated at each end thereof. Each of the connecting pieces is provided with a bore to accommodate the ends of a second conductor cable 5, 5*.
As may be gathered from Fig. 2, conductor cable 1 is bent slightly in the shape of an S and crossing piece 2 is located directly above this S-bend. Running parallel with conductor cable 1 is a second conductor cable 5, 5* which is cut at the location of the S-bend in conductor cable 1. Ends 6, 6* of conductor cable 5, -5* are inserted into the bores of cube-shaped connecting pieces 4, 4*, to which they are welded.
A spacer strip 7 is arranged between conductor cables 1 and 5.
The air-choke coil is preferably produced as follows:
the conductor for the first coil, beginning in the inside, is wound as far as the first cross-over location, the crossing piece is secured to the conductor cable, spacing means are fitted to the outside of the coil part; the next coil is then wound thereover as far as the cross-over location and is wound further with the radius of the preceding coil as far as the next cross-over location, a crossing piece is secured to the conductor cable of the second coil, spacing means are again fitted, and the ~-; 30 procedure applied to the second coil is repeated for each sub-sequent coil, but the last coil is not fitted with a crossing piece, a conductor cable is secured to the crossing piece of the first coil, and winding proceeds under tension, to the end of the 10757~;~
coil. This sequence of operations is repeated for the remainingcoils, and the whole air-choke coil is finally impregnated or glued.
The air-choke coil according to the invention not only has the advantage of eliminating the complex winding operation associated with air-choke coils having a plurality of concentric windings, or winding parts, and also the simultaneous winding of a plurality of coils, but also makes it possible to carry out the cross-overs without losing valuable winding space. Furthermore, off-sets and other deformations are no longer necessary. By means of the crossing piece described above, air-choke coils may be produced with any desired number of concentric windings.
Claims (9)
1. An air-choke coil having at least two concentric windings or winding parts and in which the said windings or winding parts are crossed characterized in that a separate crossing piece is provided for the purpose of crossing the conductor cables.
2. An air-choke coil according to claim 1 wherein the crossing piece is in the form of a flat web with a connecting piece at each end for connecting conductor cables thereto.
3. An air-choke coil according to claim 2, wherein the connecting pieces are shaped in cubic form each connecting piece having an opening for accommodating an end of a respective conductor cable.
4. An air-choke coil according to claims 2 or 3, wherein the cross-section of the web is at least equal to that of the conductor cable.
5. An air-choke coil according to claims 1, 2 or 3, wherein the crossing piece is made of the same material as the conductor cable.
6. An air-choke coil according to claim 3, wherein the ends of the conductor cables are welded to the crossing piece.
7. An air-choke coil according to claims 1, 2 or 3, wherein an insulating interlayer is inserted between the crossed conductor and the crossing piece.
8. An air-choke coil according to claims 1, 2 or 3 wherein spacer strips are provided in order to keep the coils apart.
9. An air-choke coil according to claims 1, 2 or 3, wherein the coil is glued with epoxy resin for impregnating or gluing purposes.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH1463475A CH594273A5 (en) | 1975-11-12 | 1975-11-12 | Air-core coil with concentric intersecting windings - with separate cross-piece at points of intersection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1075783A true CA1075783A (en) | 1980-04-15 |
Family
ID=4402529
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA265,392A Expired CA1075783A (en) | 1975-11-12 | 1976-11-10 | Air choke coil with conductor cross-over structure |
Country Status (3)
| Country | Link |
|---|---|
| AT (1) | AT344282B (en) |
| CA (1) | CA1075783A (en) |
| DE (2) | DE7538680U (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH659910A5 (en) * | 1983-01-27 | 1987-02-27 | Bbc Brown Boveri & Cie | AIR THROTTLE COIL AND METHOD FOR THEIR PRODUCTION. |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DD67101A (en) * | ||||
| US1554250A (en) * | 1921-11-02 | 1925-09-22 | Thomas E Murray | Reactance coil |
| US3292025A (en) * | 1964-05-15 | 1966-12-13 | Gen Electric | Dynamoelectric machine rotor end winding |
-
1975
- 1975-12-04 DE DE19757538680 patent/DE7538680U/en not_active Expired
- 1975-12-04 DE DE19752554550 patent/DE2554550C2/en not_active Expired
-
1976
- 1976-11-10 CA CA265,392A patent/CA1075783A/en not_active Expired
- 1976-11-11 AT AT841276A patent/AT344282B/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| DE2554550A1 (en) | 1977-05-26 |
| DE2554550C2 (en) | 1984-06-28 |
| ATA841276A (en) | 1977-11-15 |
| DE7538680U (en) | 1977-09-15 |
| AT344282B (en) | 1978-07-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |