EP2580767B1 - Hochleistungs-glättkondensator mit luftkern - Google Patents

Hochleistungs-glättkondensator mit luftkern Download PDF

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Publication number
EP2580767B1
EP2580767B1 EP11723968.1A EP11723968A EP2580767B1 EP 2580767 B1 EP2580767 B1 EP 2580767B1 EP 11723968 A EP11723968 A EP 11723968A EP 2580767 B1 EP2580767 B1 EP 2580767B1
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EP
European Patent Office
Prior art keywords
induction coil
windings
winding
coil
turns
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EP11723968.1A
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English (en)
French (fr)
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EP2580767A1 (de
Inventor
Joel Devautour
Youssef Ghorbel
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General Electric Technology GmbH
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Alstom Technology AG
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Publication of EP2580767A1 publication Critical patent/EP2580767A1/de
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    • 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 ⁇ H 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.
  • the figure 1 is an explanatory diagram of an electrical installation for DC arc furnace.
  • a DC arc furnace is described for example in the D5920 booklet (February 1999) of volume D12 of the book Techniques de l'Ingur.
  • 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 L 1 .
  • a second circuit comprises a thyristor rectifier device 4 whose output is connected between the cathode 10 and the anode 12 through an induction coil L 2 .
  • the coils L 1 and L 2 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 invention relates to an air induction coil for high powers formed by winding hollow bars of electrically conductive material, characterized in that it comprises at least two windings arranged coaxially and one in 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: 2 ⁇ AT ⁇ 6 ⁇ B ⁇ 6 ⁇ AT .
  • 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.
  • 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. Reference can be made here to F.W. Grover's "Inductance Calculations", Kurt F. Library, edited by D. Van Nostrand Company, Inc., New York, 1946.
  • 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 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.
  • the 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, in this embodiment, three coaxial windings: an outer winding 21, a central winding 22 and an inner winding 23.
  • Each winding comprises, in this example, five polygonal windings (for example 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.
  • B C, i.e., the half-section 24 is made a square.
  • a and B will be chosen such that 3A ⁇ 6B ⁇ 5A.
  • 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.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • General Induction Heating (AREA)
  • Coils Of Transformers For General Uses (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Furnace Details (AREA)

Claims (6)

  1. Hochleistungs-Induktionsspule (20) mit Luftkern, die durch Wicklung von Hohlstäben aus elektrisch leitfähigem Material gebildet ist, dadurch gekennzeichnet, dass sie zumindest zwei Wicklungen (21, 22, 23) aufweist, die koaxial und ineinander liegend angeordnet sind, wobei die Wicklungen in Reihe so verbunden sind, dass sie die gleiche Wicklungsrichtung beibehalten, wobei die Induktionsspule einen mittleren Radius A aufweist, wobei eine Querschnittshälfte (24) in einer Ebene die Achse der Spule enthält, die in Form eines Quadrats mit der Seite B vorliegt, so dass sie folgende Beziehung erfüllt: 2 ⁢ A ≤ 6 ⁢ B ≤ 6 ⁢ A .
    Figure imgb0003
  2. Induktionsspule nach Anspruch 1, wobei die Wicklungen aus polygonalen Windungen bestehen.
  3. Induktionsspule nach Anspruch 2, wobei die Wicklungen aus hexagonalen Windungen bestehen.
  4. Induktionsspule nach einem der Ansprüche 1 bis 3, wobei die Hohlstäbe aus Aluminium oder aus Kupfer bestehen.
  5. Induktionsspule nach einem der Ansprüche 1 bis 4, wobei die Spule drei Wicklungen (21, 22, 23) aufweist, wobei jede Wicklung fünf Windungen besitzt.
  6. Induktionsspule nach einem der Ansprüche 1 bis 5, wobei die Hohlstäbe Kanäle für das Strömen eines Kühlmediums bilden und jede Wicklung ihren eigenen Kühlkreis besitzt.
EP11723968.1A 2010-06-10 2011-06-08 Hochleistungs-glättkondensator mit luftkern Active EP2580767B1 (de)

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 EP2580767A1 (de) 2013-04-17
EP2580767B1 true EP2580767B1 (de) 2014-04-16

Family

ID=42947531

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11723968.1A Active EP2580767B1 (de) 2010-06-10 2011-06-08 Hochleistungs-glättkondensator mit luftkern

Country Status (6)

Country Link
EP (1) EP2580767B1 (de)
CA (1) CA2801515C (de)
FR (1) FR2961338B1 (de)
UA (1) UA107710C2 (de)
WO (1) WO2011154422A1 (de)
ZA (1) ZA201209170B (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220084740A1 (en) * 2020-09-14 2022-03-17 Intel Corporation Embedded cooling channel in magnetics

Family Cites Families (3)

* Cited by examiner, † Cited by third party
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

Also Published As

Publication number Publication date
CA2801515C (fr) 2017-11-21
UA107710C2 (uk) 2015-02-10
CA2801515A1 (fr) 2011-12-15
FR2961338A1 (fr) 2011-12-16
FR2961338B1 (fr) 2012-07-27
ZA201209170B (en) 2013-07-31
WO2011154422A1 (fr) 2011-12-15
EP2580767A1 (de) 2013-04-17

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