EP2992536B1 - Bobinage et transformateur l'utilisant - Google Patents

Bobinage et transformateur l'utilisant Download PDF

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Publication number
EP2992536B1
EP2992536B1 EP14719794.1A EP14719794A EP2992536B1 EP 2992536 B1 EP2992536 B1 EP 2992536B1 EP 14719794 A EP14719794 A EP 14719794A EP 2992536 B1 EP2992536 B1 EP 2992536B1
Authority
EP
European Patent Office
Prior art keywords
bobbin
transformer
winding
core
air gap
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.)
Not-in-force
Application number
EP14719794.1A
Other languages
German (de)
English (en)
Other versions
EP2992536A1 (fr
Inventor
Daniel Kearney
Uwe Drofenik
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ABB Schweiz AG
Original Assignee
ABB Schweiz AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by ABB Schweiz AG filed Critical ABB Schweiz AG
Priority to EP14719794.1A priority Critical patent/EP2992536B1/fr
Publication of EP2992536A1 publication Critical patent/EP2992536A1/fr
Application granted granted Critical
Publication of EP2992536B1 publication Critical patent/EP2992536B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
    • H01F27/325—Coil bobbins
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F5/00—Coils
    • H01F5/02—Coils wound on non-magnetic supports, e.g. formers
    • 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
    • H01F27/08—Cooling; Ventilating
    • H01F27/085—Cooling by ambient air
    • 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
    • H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
    • H01F27/306—Fastening or mounting coils or windings on core, casing or other support

Definitions

  • the present disclosure generally relates to electrical transformers.
  • it relates to medium frequency transformers having an air gap between windings and having at least one fasting element for positioning the windings in respect to each other.
  • Cooling is a critical aspect in the design of electrical transformers, as heat is inevitably generated by the current flowing through the windings.
  • electrical insulation is one of the critical aspects in the design of medium frequency transformers, in particular the insulation between the high voltage (HV) and low voltage windings (LV).
  • HV high voltage
  • LV low voltage windings
  • bobbins are created wherein the radial strength of the bobbin is exerted outwards from the bobbin on the winding, and which are placed between an inner winding and an outer winding.
  • the material of the bobbin is located for a significant part in the gap between the inner and outer windings. This requires the air gap to be larger between the high voltage and low voltage windings in order to compensate for the presence of the solid material of the bobbin.
  • a conventional bobbin also inhibits efficient air-flow and reduces the local heat transfer coefficient on the portion of the windings directed towards or in contact with the bobbin.
  • medium frequency transformers typically have demanding insulation requirements, and are of small overall size due to their high operating frequency. Therefore, the insulating air gap becomes a limiting factor when trying to achieve the aim of shrinking the transformer size.
  • an air-cooled transformer which comprises a core, an inner winding, an outer winding having an outer boundary face on its outside face, an air gap between the inner winding and the outer winding, a bobbin comprising a dielectric material, located adjacent the outer boundary face of the outer winding and supporting the outer winding and wherein the bobbin comprises supporting portions which extend into the air gap.
  • the transformer is characterized in that the bobbin is mounted to the core via at least one fastening element and the fastening element is adapted for positioning the bobbin and the outer winding with respect to the inner winding.
  • Concentric transformers according to embodiments allow the reduction of the average size of a dielectric-filled gap between the windings, thus reducing overall size, while maintaining good insulation properties between low voltage and high voltage windings.
  • An outer winding is supported mainly from outside, wherein the support has only minimal interference with a gap between the windings.
  • cooling properties are improved, while a coolant can access an enhanced surface of the windings.
  • the stray inductance of transformers according to embodiments may be quickly and easily adjusted.
  • an air insulated transformer comprises at least two windings provided on a ferromagnetic core, with an air gap between the windings.
  • the inner winding has an outer face directed towards the outer winding
  • the outer winding has an inner face directed towards the inner winding, and an outside face directed outwards, with respect to a center of the outer winding.
  • the outer winding is supported by a bobbin.
  • the bobbin is a permanent frame for the wire, acting to form the shape of the winding and ease assembly of the windings into or onto the core.
  • the bobbin is located adjacent an outer boundary face of the outer winding. Thereby, supporting portions of the bobbin may extend into the air gap between the inner winding and outer winding.
  • the air gap has regions with a greater distance and regions with a smaller distance between the inner winding and the outer winding.
  • supporting portions of the bobbin extend into the air gap, they extend into the air gap only in regions having a larger distance between the inner and outer winding.
  • the space requirement between the windings may be minimized, while maintaining predefined insulation properties.
  • embodiments allow to reduce or minimize the air gap while maintaining defined isolation properties. Minimizing the air gap also means that outer dimensions of the outer winding can be reduced, and thus the outer dimensions of the transformer as a whole can be reduced.
  • Fig. 1 shows a fluid-cooled transformer 10 according to embodiments.
  • the transformer has a shell-type core 20 having three limbs 22, 23, 24.
  • a longitudinal axis L is defined by the extension of the middle limb 23 of the core 20, around which longitudinal axis L - in the following also called axis L or middle axis L - an inner winding 30 is wound.
  • An outer winding 40 surrounding the inner winding 30 has an outer boundary face 42 on its outside face.
  • an air gap 50 is provided, which typically protrudes in a circumferential direction around the inner winding 30 and its longitudinal axis L.
  • a bobbin 60 forming the shape of the outer winding 40, comprising a dielectric material, is located adjacent the outer boundary face 42 of the outer winding 40 and supports the outer winding 40 from its outside face, differently said from a region radially outwards from the outer winding 40.
  • the bobbin 60 surrounds the outer boundary face 42 of the outer winding 40 in a circumferential direction about longitudinal axis L.
  • supporting portions 70 of the bobbin 60 protrude on an inner side 41 of the outer winding 40 radially outwards from longitudinal axis L and parallel to longitudinal axis L.
  • the air gap 50 is protruding in a circumferential direction around the inner winding 30 and the longitudinal axis L.
  • the air gap 50 surrounds the inner winding 30 and forms a space between inner winding 30 and outer winding 40. Due to the substantially cylindrical geometry with rectangular ground surface of the inner winding 30 and the outer winding 40, at least one first region 52 with a first distance d 1 between the inner winding 30 and the outer winding 40, and at least one second region 54 with a second distance d s between the inner winding 30 and outer winding 40 are provided.
  • the supporting portions 70 of the bobbin 60 may extend into the air gap 50, preferably only in the at least one first region 52, while the first distance d 1 of the first region 52 is larger than the second distance d s of the second region 54.
  • the transformer 10 exemplarily has four regions 52 with a larger first distance d 1 .
  • Four supporting portions 70 located in corner regions of the bobbin 60 of substantially rectangular cross section, support the outer winding 40, wherein the supporting portions 70 are mounted to that part of the bobbin 60 which protrudes along the outer boundary face 42 of the outer winding.
  • the depicted bobbin 60 has a substantially rectangular cross section perpendicular to the longitudinal axis L, there are four regions 52 with a larger first distance d 1 and also four regions 54 with a smaller second distance d s , of which only two are visible in Fig. 2 .
  • the regions 54 of smaller distance compared to the regions 52 are formed by parallel sides of the inner winding 30 and by parallel sides of the outer winding 30, each winding 30, 40 of substantially rectangular cross section.
  • the air gap 50 between the inner and outer winding may also be substantially or entirely free of dielectric material of the bobbin 60.
  • the supporting portions 70 as shown in Fig. 1 and Fig. 2 , extending from the bobbin into the air gap are omitted in this case.
  • the bobbin 60 is mounted to the bobbin structure by other means. In embodiments, this may be realized by an adhesive, e.g. a resin, more specifically an epoxy or polyester resin, which fixes the outer winding 60 to the bobbin located around its outer boundary face 42. That is, the outer winding 40 is glued to the bobbin located on its outer boundary face 42.
  • the single wires of the windings are typically immersed by the glue or resin, i.e. they are completely covered by it.
  • the bobbin 60 supports outer winding 40 entirely from its outside, without any part of the bobbin extending into the air gap 50 between the inner winding 30 and the outer winding 40.
  • the bobbin 60 is typically mounted to the core 20. This may be realized by at least one fastening element 100.
  • the fastening element 100 is adapted for positioning the bobbin 60 and the outer winding 40 with respect to the inner winding 30 in a direction along the longitudinal axis L. By changing the relative position of the bobbin 60 with respect to the inner winding along the longitudinal axis L, a stray inductance of the transformer 10 may be adjusted.
  • the fastening element 100 typically extends from the bobbin 60 towards the core 20 in a radial direction outwards with respect to the longitudinal axis L.
  • the at least one fastening element 100 of the bobbin 60 is typically movably mounted to at least one outer limb 22, 24 of the core 20. This allows an adjustment of the bobbin 60, and thus also the outer winding 40 supported by it, in a direction parallel to the longitudinal axis L to adjust the stray inductance of the transformer.
  • four fastening elements 100 are shown, of which two are mounted to each limb 22, 24, typically the outer limbs 22, 24 of a shell type core.
  • Each fastening element 100 typically embraces the respective limb 22, 24. Also, the fastening elements 100 may only partially embrace or surround the limbs 22, 24, for example they may be designed to have a clamp shape, e.g., resembling a C, and may for example only surround one half of the limb 22, 24. It goes without saying that the skilled person can easily find a number of variations of fastening elements, which are regarded to fall into the scope of the present disclosure.
  • the core 20 typically comprises a non-conductive ferrite material or a laminated silicon steel.
  • FIG. 3 two geometrical planes a and b are shown, which delimit the inner winding 30 and the outer winding 40 in a direction of the longitudinal axis L.
  • the supporting portions 70 of the bobbin 60 typically protrude in the air gap 50, that is in the space between the inner winding 30 and the outer winding 40, between the two planes a and b.
  • a bobbin 60 of a transformer 10 according to embodiments is shown.
  • the bobbin 60 comprises four substantially rectangular segments 110, 112, 114, 116.
  • Each segment 110, 112, 114, 116 extends between two neighboring supporting portions 70 of a pillar-like, elongated shape.
  • the segments 110, 112, 114, 116 together form the cage-like bobbin 60 with rectangular cross section.
  • the cage-like bobbin 60 has a cube-like shape, wherein the segments 110, 112, 114, 116 form four of the six side faces of the cube, and wherein two opposite side faces are left out.
  • the number of rectangular segments can differ, such that the bobbin 60 has an n-polyedric cross section , with n being, for example, 4, 5, 6, or 8.
  • Fig. 5 and Fig. 6 show a side view and a top view of the bobbin 60 of Fig. 4 .
  • the core 20 of transformer 10 may also be a closed-core type or D-type, different from the embodiments of Fig. 1 to 3 showing a shell-type or E-type shape.
  • the bobbin extends around one of the two limbs of the closed-core transformer, and is typically mounted via a fastening element 100 to the second, other limb.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Of Transformers For General Uses (AREA)

Claims (12)

  1. Transformateur à refroidissement par fluide (10), comprenant :
    - un noyau (20),
    - un enroulement interne (30),
    - un enroulement externe (40) ayant une face de frontière externe (42) sur sa face externe,
    - un entrefer (50) entre l'enroulement interne (30) et l'enroulement externe (40),
    - une bobine (60) comprenant un matériau diélectrique, située adjacente à la face de frontière externe (42) de l'enroulement externe (40) et supportant l'enroulement externe (40), dans lequel la bobine (60) comprend des parties de support (70) sui s'étendent à l'intérieur de l'entrefer (50), caractérisé en ce que,
    - la bobine (60) est montée contre le noyau (20) par l'intermédiaire d'au moins un élément de fixation (100) et l'élément de fixation (100) est adapté pour positionner la bobine (60) et l'enroulement externe (40) par rapport à l'enroulement interne (30) pour ajuster une inductance parasite du transformateur (10).
  2. Transformateur selon la revendication 1, dans lequel l'entrefer (50) comporte au moins une première région (52) avec une première distance entre l'enroulement interne (30) et l'enroulement externe (40), et au moins une seconde région (54) avec une seconde distance entre l'enroulement interne (30) et l'enroulement externe (40), et dans lequel les parties de support (70) s'étendent à l'intérieur de l'entrefer (50) dans l'au moins une première région (52), et dans lequel la première distance de la première région (52) est supérieure à la seconde distance de la seconde région (54).
  3. Transformateur selon la revendication 2, dans lequel l'entrefer (50) est dépourvu du matériau de la bobine (60) dans l'au moins une seconde région (54) avec la distance inférieure entre l'enroulement interne (30) et l'enroulement externe (40).
  4. Transformateur selon la revendication 1, dans lequel l'élément de fixation (100) dépasse de la bobine (60) vers le noyau (20) dans un sens radial vers l'extérieur par rapport à un axe longitudinal (L).
  5. Transformateur selon l'une quelconque des revendications précédentes, dans lequel la bobine (60) est montée de manière mobile sur une branche (22, 24) du noyau (20), permettant un ajustement dans un sens parallèle à un axe longitudinal (L) pour ajuster une inductance parasite du transformateur (10).
  6. Transformateur selon l'une quelconque des revendications précédentes, dans lequel le noyau (20) comprend un matériau de ferrite non conducteur.
  7. Transformateur selon l'une quelconque des revendications précédentes, dans lequel la bobine (60) comprend n segments rectangulaires (110, 112, 114, 116) s'étendant entre des parties de support voisines (70).
  8. Transformateur selon la revendication 7, dans lequel la bobine (60) a une coupe transversale n-polyédrique.
  9. Transformateur selon l'une quelconque des revendications précédentes, dans lequel la bobine (60) entoure la face externe de l'enroulement externe (40).
  10. Transformateur selon l'une quelconque des revendications précédentes, dans lequel le noyau a l'une d'une : forme du type coquille et d'une forme du type noyau fermé.
  11. Transformateur selon l'une des revendications 1 à 9, dans lequel le noyau (20) a une forme du type coquille avec une branche centrale (23) portant l'enroulement interne (30), et deux branches externes (22, 24), et dans lequel la bobine (60) est montée par l'intermédiaire d'éléments de fixation (100) sur au moins l'une des branches externes (22, 24), de telle sorte que la bobine (60) soit réglable par rapport à l'enroulement interne (30) dans un sens parallèle à l'axe longitudinal (L) afin d'ajuster une inductance parasite du transformateur (10).
  12. Transformateur selon la revendication 11, dans lequel la bobine (60) est ajustable par l'intermédiaire des éléments de fixation (100) par rapport à l'enroulement interne (30) dans au moins un sens perpendiculaire à l'axe longitudinal (L) afin d'ajuster une inductance parasite du transformateur (10).
EP14719794.1A 2013-04-29 2014-04-29 Bobinage et transformateur l'utilisant Not-in-force EP2992536B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP14719794.1A EP2992536B1 (fr) 2013-04-29 2014-04-29 Bobinage et transformateur l'utilisant

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP13165777 2013-04-29
EP14719794.1A EP2992536B1 (fr) 2013-04-29 2014-04-29 Bobinage et transformateur l'utilisant
PCT/EP2014/058674 WO2014177534A1 (fr) 2013-04-29 2014-04-29 Bobine, et transformateur équipé de ladite bobine

Publications (2)

Publication Number Publication Date
EP2992536A1 EP2992536A1 (fr) 2016-03-09
EP2992536B1 true EP2992536B1 (fr) 2017-05-31

Family

ID=48184092

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14719794.1A Not-in-force EP2992536B1 (fr) 2013-04-29 2014-04-29 Bobinage et transformateur l'utilisant

Country Status (3)

Country Link
EP (1) EP2992536B1 (fr)
CN (1) CN105144314B (fr)
WO (1) WO2014177534A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107112122B (zh) * 2015-05-15 2018-11-30 富士电机株式会社 绕组部件的冷却构造

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT365850B (de) * 1979-05-07 1982-02-25 Zumtobel Ag Spulenkoerper fuer elektrische drahtwicklungen
DE8007711U1 (de) * 1980-03-21 1980-09-11 W. Meffert Kg, 4006 Erkrath Spulenkoerper zur aufnahme elektrotechnischen wickelgutes
GB2333646B (en) * 1998-05-29 2000-01-12 Electronic Tech Transformer bobbin
EP1283589A3 (fr) * 2001-08-09 2003-03-26 Bombardier Transportation GmbH Module convertisseur de puissance
DE10203246B4 (de) * 2002-01-21 2004-01-29 Bombardier Transportation Gmbh Mittelfrequenz-Transformator
US8698588B2 (en) * 2010-07-02 2014-04-15 Samsung Electro-Mechanics Co., Ltd. Transformer

Also Published As

Publication number Publication date
CN105144314B (zh) 2017-03-22
WO2014177534A1 (fr) 2014-11-06
EP2992536A1 (fr) 2016-03-09
CN105144314A (zh) 2015-12-09

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