WO1995022153A1 - Electric windings for inductors and transformers having water-cooled tubular elements and a helically wound coating of flat wires - Google Patents
Electric windings for inductors and transformers having water-cooled tubular elements and a helically wound coating of flat wires Download PDFInfo
- Publication number
- WO1995022153A1 WO1995022153A1 PCT/IT1994/000012 IT9400012W WO9522153A1 WO 1995022153 A1 WO1995022153 A1 WO 1995022153A1 IT 9400012 W IT9400012 W IT 9400012W WO 9522153 A1 WO9522153 A1 WO 9522153A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- electric windings
- coating
- wires
- windings
- electric
- Prior art date
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
- H01F27/2876—Cooling
Definitions
- the invention concerns windings ror inductors and trans- formers used especially in railway vehicles.
- con ⁇ ductors whose components are insulated one from another.
- cooling is done by pressurized air and by oil.
- Resistivity and therefore resistance of the Anticorodal alloy, and losses in direct current, are about one third greater than those that occur with pure aluminium.
- the invention concerns electric windings, for inductors and transformers, consisting of a tubular element cooled by internal circulation of liquid and coated with heli ⁇ cally wound wires.
- wires are laid symme rically side by side and are insulated one from another. Varying from one case to another said wires are flat or round .
- the most suitable liquid for cooling is demineralized water, but it may also be oil.
- Coating wires may be of aluminium or copper.
- the tubular elements may be of steel or of an aluminium alloy, especially Anticorodal.
- the coating of copper wires or flat wires, forms a con- t inuous layer .
- Thermal head between tube, wires and flat wires is very small .
- Current is equally distributed among wires and flat wires whatever the frequency may be and no stray current is created .
- Resistivity of copper is less than half that of aluminium alloy and losses in direct current are therefore low. As frequency increases the current is distributed over all wires and flat wires which means only a very slight increase of resistance in alternating current. Current is distributed uniformly around the tubular ele- ments so that when frequency varies inductance value re ⁇ mains substantially constant.
- Fig.1 Winding of the usual type made from a tubular ele ⁇ ment of Anticorodal, cut through lengthwise.
- Fig.2 A length of the tubular element of a winding as here invented, drawn in a straight line.
- the winding 10 of a type at present known is made from a tube 11 of Anticorodal helically bent with turns 12.
- Demineralized water 14 runs through the inside 13 of the tube .
- the winding 20, subject of the invention is made of a tube 21 of stainless steel through which demineralized water 22 runs .
- a helical coating consisting of a number of flat wires 23, 24, n. Said flat wires are insulated, laid symmetrically side by side so as to form a substantially continuous layer
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP94910506A EP0742949A1 (en) | 1994-02-09 | 1994-02-11 | Electric windings for inductors and transformers having water-cooled tubular elements and a helically wound coating of flat wires |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITMI94A000232 | 1994-02-09 | ||
ITMI940232A IT1273747B (en) | 1994-02-09 | 1994-02-09 | ELECTRIC WINDINGS FOR INDUCTORS AND TRANSFORMERS WITH WATER COOLED TUBULAR ELEMENTS AND HELICAL COATING IN PLATES |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1995022153A1 true WO1995022153A1 (en) | 1995-08-17 |
Family
ID=11367813
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IT1994/000012 WO1995022153A1 (en) | 1994-02-09 | 1994-02-11 | Electric windings for inductors and transformers having water-cooled tubular elements and a helically wound coating of flat wires |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0742949A1 (en) |
IT (1) | IT1273747B (en) |
WO (1) | WO1995022153A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001084571A1 (en) * | 2000-04-28 | 2001-11-08 | Abb Ab | A stationary induction machine and a cable therefor |
EP3553797A1 (en) * | 2018-04-13 | 2019-10-16 | Institute for Plasma Research | A method of manufacturing radio frequency (rf) coil multi-driven rf based-ve ion source |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1514142A1 (en) * | 1965-06-12 | 1969-04-17 | Lepper Dr Ing W | Coils for induction apparatus |
US3946349A (en) * | 1971-05-03 | 1976-03-23 | The United States Of America As Represented By The Secretary Of The Air Force | High-power, low-loss high-frequency electrical coil |
JPS57118614A (en) * | 1981-01-16 | 1982-07-23 | Kansai Electric Power Co Inc:The | Refrigerant cooling type electric machine coil |
CA1210464A (en) * | 1982-12-24 | 1986-08-26 | Patrick E. Burke | Iron powder encapsulated liquid cooled reactors |
-
1994
- 1994-02-09 IT ITMI940232A patent/IT1273747B/en active IP Right Grant
- 1994-02-11 WO PCT/IT1994/000012 patent/WO1995022153A1/en not_active Application Discontinuation
- 1994-02-11 EP EP94910506A patent/EP0742949A1/en not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1514142A1 (en) * | 1965-06-12 | 1969-04-17 | Lepper Dr Ing W | Coils for induction apparatus |
US3946349A (en) * | 1971-05-03 | 1976-03-23 | The United States Of America As Represented By The Secretary Of The Air Force | High-power, low-loss high-frequency electrical coil |
JPS57118614A (en) * | 1981-01-16 | 1982-07-23 | Kansai Electric Power Co Inc:The | Refrigerant cooling type electric machine coil |
CA1210464A (en) * | 1982-12-24 | 1986-08-26 | Patrick E. Burke | Iron powder encapsulated liquid cooled reactors |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 6, no. 215 (E - 138)<1093> 28 October 1982 (1982-10-28) * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001084571A1 (en) * | 2000-04-28 | 2001-11-08 | Abb Ab | A stationary induction machine and a cable therefor |
EP3553797A1 (en) * | 2018-04-13 | 2019-10-16 | Institute for Plasma Research | A method of manufacturing radio frequency (rf) coil multi-driven rf based-ve ion source |
US20190314922A1 (en) * | 2018-04-13 | 2019-10-17 | Institute For Plasma Research | Method of Manufacturing Radio Frequency (RF) Coil Multi-Driven RF Based-Ve Ion Source |
Also Published As
Publication number | Publication date |
---|---|
IT1273747B (en) | 1997-07-10 |
ITMI940232A1 (en) | 1995-08-09 |
EP0742949A1 (en) | 1996-11-20 |
ITMI940232A0 (en) | 1994-02-09 |
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