EP2580767A1 - Bobine de lissage a air pour fortes puissances - Google Patents
Bobine de lissage a air pour fortes puissancesInfo
- Publication number
- EP2580767A1 EP2580767A1 EP11723968.1A EP11723968A EP2580767A1 EP 2580767 A1 EP2580767 A1 EP 2580767A1 EP 11723968 A EP11723968 A EP 11723968A EP 2580767 A1 EP2580767 A1 EP 2580767A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- windings
- induction coil
- coil
- winding
- turns
- 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.)
- Granted
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
-
- 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 relates to air induction coils for high power.
- Such induction coils are for example used for the power supply of DC arc furnaces.
- the power supplies of DC arc furnaces use air induction coils with values between 100 ⁇ and 1 mH. These coils can be traversed by currents up to 70 kA.
- induction coils consisting of monolayer solenoids with a square or hexagonal base.
- FIG. 1 is an explanatory diagram of an electrical installation for DC arc furnace.
- Reference 1 designates an arc furnace containing a metallic material 2 to be treated.
- the oven 1 is equipped, in the example shown, with a cathode 10 and two anodes 11 and 12.
- Two power supply circuits are shown.
- a first circuit comprises a thyristor rectifier device 3 whose output is connected between the cathode 10 and the anode 11 through an induction coil Li.
- circuit comprises a thyristor rectifier device 4 whose output is connected between the cathode 10 and the anode 12 through an induction coil L2.
- the coils Li and L2 are high-power air coils.
- the present invention has been realized to optimize the induction coils of high power in order to reduce in particular their bulk and the Joule losses that they cause.
- the subject of the invention is an air induction coil for high powers formed by winding hollow bars made of electrically conductive material, characterized in that it comprises at least two windings arranged coaxially and one inside the other, the windings being connected in series so as to maintain the same winding direction, the induction coil having a mean radius A, a half-section in a plane comprising the axis of the coil which is square-shaped with a side B, so as to satisfy the relationship: 2A ⁇ 6B ⁇ 6A.
- the windings consist of polygonal turns, for example hexagonal turns.
- the hollow bars may be aluminum or copper.
- each winding can have its own cooling circuit to reduce the losses in load.
- FIG 1, already described, is an explanatory diagram of an electrical installation for DC arc furnace, according to the prior art
- FIG 2 is a sectional view of an induction coil, the section being made in a plane comprising the axis of the coil, according to the present invention.
- the idea underlying the present invention consists in fitting windings (or elementary coils) into each other for build a global reel while trying to get closer to the Brooks model.
- Brooks model was proposed in 1931 to optimize multilayer coils, based on circular turns, made with wire.
- the air induction coil of the present invention is made from hollow bars of high section (typically of the order of 20 000 mm 2 ).
- the optimal shape is the circular shape. This form is not excluded from the present invention, however such a geometry is difficult to achieve with bars of large section.
- a square shaped coil is simple to make but is not optimal. The hexagon is closer to the circle and not too complex from an industrial point of view. It also has the advantage of reducing the electromagnetic forces in the corners. We could consider spirals of more complicated shapes, such as the octagon for example. However, the manufacturing cost would be higher because of the increased number of welds.
- the conductive bars used are for example extruded aluminum. One could also use copper, or another electrically conductive material.
- the bars being hollow, the inside forms channels allowing the circulation of a cooling fluid.
- the coil according to the invention may have a single cooling circuit common to each winding. However, better results are obtained if each winding has its own cooling circuit. The cooling circuits are then connected in parallel.
- the winding can be from the top down, or from the inside to the outside, or by another method. The important thing is to keep the same winding direction for the windings.
- Figure 2 is a sectional view of an induction coil according to the present invention, the section being made in a plane comprising the axis of the coil.
- the induction coil 20 comprises three coaxial windings: an outer winding 21, a central winding 22 and an inner winding 23.
- Each winding comprises, in this example, five turns of polygonal shape (by hexagonal example).
- the half-section 24 of the coil has a height B and a width C. It is located at a mean distance A from the axis of the coil. Shims of electrically insulating material are provided in the coil to support the turns of the windings and to separate the windings from each other.
- an inductance coil according to the present invention compared to a coil of the prior art consisting of a single solenoid, of the same inductance value and of the same rod section, a reduction of 40% of weight of the reel, 25% less Joule losses and a reduced height of three times.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- General Induction Heating (AREA)
- Coils Or Transformers For Communication (AREA)
- Coils Of Transformers For General Uses (AREA)
- Furnace Details (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1054595A FR2961338B1 (fr) | 2010-06-10 | 2010-06-10 | Bobine de lissage a air pour fortes puissances |
| PCT/EP2011/059429 WO2011154422A1 (fr) | 2010-06-10 | 2011-06-08 | Bobine de lissage a air pour fortes puissances |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2580767A1 true EP2580767A1 (fr) | 2013-04-17 |
| EP2580767B1 EP2580767B1 (fr) | 2014-04-16 |
Family
ID=42947531
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP11723968.1A Active EP2580767B1 (fr) | 2010-06-10 | 2011-06-08 | Bobine de lissage a air pour fortes puissances |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP2580767B1 (fr) |
| CA (1) | CA2801515C (fr) |
| FR (1) | FR2961338B1 (fr) |
| UA (1) | UA107710C2 (fr) |
| WO (1) | WO2011154422A1 (fr) |
| ZA (1) | ZA201209170B (fr) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US12100541B2 (en) * | 2020-09-14 | 2024-09-24 | Intel Corporation | Embedded cooling channel in magnetics |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2939647A1 (de) * | 1979-09-29 | 1981-04-23 | Fried. Krupp Gmbh, 4300 Essen | Spule zum induktiven schmelzen |
| JPS57118613A (en) * | 1981-01-16 | 1982-07-23 | Kansai Electric Power Co Inc:The | Refrigerant cooling equipment for electric machine coil |
| JPS6012711A (ja) * | 1983-07-01 | 1985-01-23 | Takaoka Ind Ltd | ウエツトタイプガス絶縁変圧器 |
-
2010
- 2010-06-10 FR FR1054595A patent/FR2961338B1/fr not_active Expired - Fee Related
-
2011
- 2011-06-08 WO PCT/EP2011/059429 patent/WO2011154422A1/fr not_active Ceased
- 2011-06-08 EP EP11723968.1A patent/EP2580767B1/fr active Active
- 2011-06-08 CA CA2801515A patent/CA2801515C/fr active Active
- 2011-08-06 UA UAA201300333A patent/UA107710C2/ru unknown
-
2012
- 2012-12-05 ZA ZA2012/09170A patent/ZA201209170B/en unknown
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2011154422A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2801515A1 (fr) | 2011-12-15 |
| UA107710C2 (uk) | 2015-02-10 |
| ZA201209170B (en) | 2013-07-31 |
| WO2011154422A1 (fr) | 2011-12-15 |
| FR2961338A1 (fr) | 2011-12-16 |
| FR2961338B1 (fr) | 2012-07-27 |
| CA2801515C (fr) | 2017-11-21 |
| EP2580767B1 (fr) | 2014-04-16 |
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