EP2580767B1 - High-power air-core smoothing inductor - Google Patents
High-power air-core smoothing inductor Download PDFInfo
- 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
- 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.)
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Links
- 238000009499 grossing Methods 0.000 title 1
- 238000004804 winding Methods 0.000 claims description 30
- 230000006698 induction Effects 0.000 claims description 24
- 238000001816 cooling Methods 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- 239000004020 conductor Substances 0.000 claims description 3
- 239000012809 cooling fluid Substances 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000010891 electric arc Methods 0.000 description 2
- 238000010616 electrical installation Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000012777 electrically insulating material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
Images
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 ⁇ 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.
Description
L'invention se rapporte aux bobines d'induction à air pour fortes puissances. De telles bobines d'induction sont par exemple utilisées pour l'alimentation électrique des fours à arc à courant continu.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.
Les alimentations électriques des fours à arc à courant continu utilisent des bobines d'induction à air présentant des valeurs variant entre 100 µH et 1 mH. Ces bobines peuvent être parcourues par des courants pouvant aller jusqu'à 70 kA.The power supplies of DC arc furnaces use air induction coils with values between 100 μH and 1 mH. These coils can be traversed by currents up to 70 kA.
Pour les applications de type four à arc électrique, il est connu d'utiliser des bobines d'induction constituées de solénoïdes monocouches à base carrée ou hexagonale.For electric arc furnace type applications, it is known to use induction coils consisting of monolayer solenoids with a square or hexagonal base.
La
L'augmentation de la puissance des fours à arc électrique installés ces dernières années a provoqué l'augmentation de la valeur du courant continu à fournir et aussi l'augmentation de la valeur des bobines d'induction à air. Ceci conduit à des bobines énormes et implique des pertes Joule importantes. Ces bobines d'induction sont en outre très encombrantes. Elles posent donc divers problèmes relatifs à leur installation, leur montage, leur refroidissement ...The increase in the power of the electric arc furnaces installed in recent years has caused the increase of the value of the direct current to be supplied and also the increase of the value of the air induction coils. This leads to huge coils and involves significant Joule losses. These induction coils are also very bulky. They therefore pose various problems relating to their installation, assembly, cooling ...
La présente invention a été réalisée pour optimiser les bobines d'induction de fortes puissances afin de réduire notamment leur encombrement et les pertes Joule qu'elles provoquent.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.
L'invention a pour objet une bobine d'induction à air pour fortes puissances formée par bobinage de barres creuses en matériau électriquement conducteur, caractérisé en ce qu'elle comprend au moins deux enroulements disposés coaxialement et l'un dans l'autre, les enroulements étant connectés en série de façon à conserver le même sens d'enroulement, la bobine d'induction présentant un rayon moyen A, une demi-section dans un plan comprenant l'axe de la bobine qui est de forme carrée de côté B, de sorte à satisfaire la relation : 
Avantageusement, les enroulements sont constitués de spires polygonales, par exemple de spires hexagonales.Advantageously, the windings consist of polygonal turns, for example hexagonal turns.
Les barres creuses peuvent être en aluminium ou en cuivre.The hollow bars may be aluminum or copper.
Les barres creuses formant des canaux pour la circulation d'un fluide de refroidissement, chaque enroulement peut posséder son propre circuit de refroidissement pour diminuer les pertes en charge.The hollow bars forming channels for the circulation of a cooling fluid, each winding can have its own cooling circuit to reduce the losses in load.
L'invention sera mieux comprise et d'autres avantages et particularités apparaîtront à la lecture de la description qui va suivre, donnée à titre d'exemple non limitatif, accompagnée des figures annexées parmi lesquelles :
- la
figure 1 , déjà décrite, est un schéma explicatif d'une installation électrique pour four à arc à courant continu, selon l'art connu, - la
figure 2 est une vue en coupe d'une bobine d'induction, la coupe étant faite dans un plan comprenant l'axe de la bobine, selon la présente invention.
- the
figure 1 , already described, is an explanatory diagram of an electrical installation for DC arc furnace, according to the prior art, - the
figure 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.
L'idée qui est à la base de la présente invention consiste à emboîter des enroulements (ou bobines élémentaires) les uns dans les autres pour constituer une bobine globale tout en essayant de se rapprocher du modèle de Brooks.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.
Le modèle de Brooks a été proposé en 1931 pour optimiser des bobines multicouches, à base de spires circulaires, réalisées avec du fil. On peut se reporter à ce sujet à l'ouvrage « Inductance Calculations » de F.W. Grover, Kurt F. Library, édité par D. Van Nostrand Company, Inc., New York, 1946.The 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.
La bobine d'induction à air de la présente invention est réalisée à partir de barres creuses de forte section (typiquement de l'ordre de 20 000 mm2). Pour une spire de la bobine, la forme optimale est la forme circulaire. Cette forme n'est pas exclue de la présente invention, cependant une telle géométrie est difficile à réaliser avec des barres de forte section. On préférera donc une spire de base de forme polygonale constituée de barres droites mises bout à bout et soudées selon un angle correspondant au polygone choisi. Une spire de forme carrée est simple à réaliser mais n'est pas optimale. L'hexagone est plus proche du cercle et pas trop complexe d'un point de vue industriel. Il présente en outre l'avantage de réduire les efforts électromagnétiques dans les angles. On pourrait envisager des spires de formes plus compliquées, comme l'octogone par exemple. Cependant, le coût de fabrication serait alors plus élevé à cause du nombre accru de soudures.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 ). For a turn of the coil, 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. We therefore prefer a base turn of polygonal shape consisting of straight bars placed end to end and welded at an angle corresponding to the chosen polygon. 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.
La réalisation d'une simple bobine de type solénoïde ne permet pas de respecter les facteurs de forme du modèle de Brooks de manière à répondre à l'équation 2A = 3C (A étant le rayon moyen de la bobine et C le côté du carré constituant la demi-section de la bobine dans le plan contenant son axe). En effet, cela nécessiterait d'utiliser des profilés de section très aplatie qui sont difficiles à réaliser industriellement. Les bobines de type solénoïde, lorsqu'elles sont réalisées en profilés (ou barres) refroidis par des canaux, sont alors très hautes et de grands diamètres.The realization of a simple solenoid-type coil does not allow to respect the form factors of the Brooks model so as to satisfy the equation 2A = 3C (A being the mean radius of the coil and C the side of the square constituting the half-section of the coil in the plane containing its axis). Indeed, this would require the use of very flattened which are difficult to achieve industrially. The solenoid-type coils, when they are made of profiles (or bars) cooled by channels, are then very high and large diameters.
Le fait d'emboîter des bobines élémentaires (ou enroulements) les unes dans les autres et de les brancher en série, selon la présente invention, permet théoriquement de parvenir au modèle de Brooks (2A = 3C comme indiqué ci-dessus). Dans la pratique, on peut se satisfaire de la relation : 3A ≤ 6B ≤ 5A.The fact of fitting elementary coils (or windings) into one another and connecting them in series, according to the present invention theoretically makes it possible to arrive at the Brooks model (2A = 3C as indicated above). In practice, one can be satisfied with the relation: 3A ≤ 6B ≤ 5A.
Les barres conductrices utilisées sont par exemple en aluminium extrudé. On pourrait également utiliser le cuivre, ou un autre matériau électriquement conducteur. Les barres étant creuses, l'intérieur forme des canaux permettant la circulation d'un fluide de refroidissement. La bobine selon l'invention peut avoir un seul circuit de refroidissement commun à chaque enroulement. Cependant, de meilleurs résultats sont obtenus si chaque enroulement possède son propre circuit de refroidissement. Les circuits de refroidissement sont alors mis en parallèle.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.
Le bobinage peut se faire du haut vers le bas, ou de l'intérieur vers l'extérieur, ou encore par une autre méthode. L'important est de conserver le même sens de bobinage pour les enroulements.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.
La
La bobine d'induction 20 comprend, dans cet exemple de mise en oeuvre, trois enroulements coaxiaux : un enroulement extérieur 21, un enroulement central 22 et un enroulement intérieur 23. Chaque enroulement comprend, dans cet exemple, cinq spires de forme polygonale (par exemple hexagonale). La demi-section 24 de la bobine présente une hauteur B et une largeur C. Elle est située à une distance moyenne A de l'axe de la bobine. Des cales en matériau électriquement isolant sont prévues dans la bobine pour supporter les spires des enroulements et pour séparer les enroulements entre eux.The
Pour satisfaire le modèle de Brooks, on fait en sorte que B = C, c'est-à-dire que la demi-section 24 est un carré. De même, on choisira A et B de sorte que 3A ≤ 6B ≤ 5A.To satisfy the Brooks model, B = C, i.e., the half-
Pour une bobine d'inductance selon la présente invention, on constate, par rapport à une bobine de l'art antérieur constituée d'un simple solénoïde, de même valeur d'inductance et de même section de barre, une réduction de 40% du poids de la bobine, 25% de pertes Joules en moins et une hauteur réduite de trois fois.For 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.
Claims (6)
- An air-core induction coil (20) for high power, which coil is formed by winding hollow bars of electrically conductive material, said induction coil being characterized in that it comprises at least two windings (21, 22, 23) placed coaxially one inside the other, the windings being connected together in series in such a manner as to keep the same winding direction, the induction coil having a mean radius A, and a half-section (24) in a plane containing the axis of the coil that is of square shape and of side B, so as to satisfy the following relationship: 2A≤ 6B ≤ 6A.
- An induction coil according to claim 1, wherein the windings are constituted by polygonal turns.
- An induction coil according to claim 2, wherein the windings are constituted by hexagonal turns.
- An induction coil according to any one of claims 1 to 3, wherein the hollow bars are made of aluminum or of copper.
- An induction coil according to any one of claims 1 to 4, wherein the coil comprises three windings (21, 22, 23), each winding having five turns.
- An induction coil according to any one of claims 1 to 5, wherein, with the hollow bars forming channels through which a cooling fluid can flow, each winding has its own cooling circuit.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1054595A FR2961338B1 (en) | 2010-06-10 | 2010-06-10 | AIR SMOOTHING COIL FOR HIGH POWER |
| PCT/EP2011/059429 WO2011154422A1 (en) | 2010-06-10 | 2011-06-08 | High-power air-core smoothing inductor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2580767A1 EP2580767A1 (en) | 2013-04-17 |
| EP2580767B1 true EP2580767B1 (en) | 2014-04-16 |
Family
ID=42947531
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP11723968.1A Active EP2580767B1 (en) | 2010-06-10 | 2011-06-08 | High-power air-core smoothing inductor |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP2580767B1 (en) |
| CA (1) | CA2801515C (en) |
| FR (1) | FR2961338B1 (en) |
| UA (1) | UA107710C2 (en) |
| WO (1) | WO2011154422A1 (en) |
| ZA (1) | ZA201209170B (en) |
Families Citing this family (1)
| 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)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2939647A1 (en) * | 1979-09-29 | 1981-04-23 | Fried. Krupp Gmbh, 4300 Essen | Induction coil for smelting oven - has hollow windings connected in pairs defining coolant circulation path |
| JPS57118613A (en) * | 1981-01-16 | 1982-07-23 | Kansai Electric Power Co Inc:The | Refrigerant cooling equipment for electric machine coil |
| JPS6012711A (en) * | 1983-07-01 | 1985-01-23 | Takaoka Ind Ltd | Wet type gas insulated transformer |
-
2010
- 2010-06-10 FR FR1054595A patent/FR2961338B1/en not_active Expired - Fee Related
-
2011
- 2011-06-08 EP EP11723968.1A patent/EP2580767B1/en active Active
- 2011-06-08 CA CA2801515A patent/CA2801515C/en active Active
- 2011-06-08 WO PCT/EP2011/059429 patent/WO2011154422A1/en active Application Filing
- 2011-08-06 UA UAA201300333A patent/UA107710C2/en unknown
-
2012
- 2012-12-05 ZA ZA2012/09170A patent/ZA201209170B/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| CA2801515A1 (en) | 2011-12-15 |
| UA107710C2 (en) | 2015-02-10 |
| WO2011154422A1 (en) | 2011-12-15 |
| FR2961338B1 (en) | 2012-07-27 |
| ZA201209170B (en) | 2013-07-31 |
| EP2580767A1 (en) | 2013-04-17 |
| FR2961338A1 (en) | 2011-12-16 |
| CA2801515C (en) | 2017-11-21 |
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