EP3198617B1 - Noyau magnetique de transformateur tournant - Google Patents

Noyau magnetique de transformateur tournant Download PDF

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Publication number
EP3198617B1
EP3198617B1 EP15778377.0A EP15778377A EP3198617B1 EP 3198617 B1 EP3198617 B1 EP 3198617B1 EP 15778377 A EP15778377 A EP 15778377A EP 3198617 B1 EP3198617 B1 EP 3198617B1
Authority
EP
European Patent Office
Prior art keywords
core
laminations
circular
forming
bars
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.)
Active
Application number
EP15778377.0A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3198617A1 (fr
Inventor
Jean-Michel CHASTAGNIER
Frédéric MEER
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.)
Safran Electrical and Power SAS
Original Assignee
Safran Electrical and Power SAS
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Application filed by Safran Electrical and Power SAS filed Critical Safran Electrical and Power SAS
Publication of EP3198617A1 publication Critical patent/EP3198617A1/fr
Application granted granted Critical
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/18—Rotary transformers
    • 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
    • H01F27/24—Magnetic cores
    • H01F27/245—Magnetic cores made from sheets, e.g. grain-oriented
    • 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
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/10—Composite arrangements of magnetic circuits
    • H01F3/14—Constrictions; Gaps, e.g. air-gaps
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F30/00—Fixed transformers not covered by group H01F19/00
    • H01F30/06—Fixed transformers not covered by group H01F19/00 characterised by the structure
    • H01F30/10—Single-phase transformers

Definitions

  • the present invention relates to the general field of "U-shaped" rotary transformers used to achieve an electric power transfer by electromagnetic induction between two elements.
  • a "U-shaped" rotary transformer typically consists of two radially superimposed circular geometry elements, namely an inner core having one or more outer annular grooves in which toric coils are housed and an outer core mounted around the core internal being concentric with it and having one or more internal annular grooves facing the outer grooves of the inner core and in which are housed toric coils.
  • These two elements with circular geometry are mounted concentrically in such a way that one of the elements can rotate relative to the other around a common longitudinal axis.
  • Such a rotating transformer architecture poses a number of problems.
  • toric coils having a large section it is not always possible to deform them to accommodate them in the inner grooves of the outer core, so that it is then necessary to form the outer core around these reels.
  • the materials used sintered ferrite or cast iron are fragile and do not always withstand severe vibration environments such as can be found in particular in the field of aeronautics.
  • the document FR 1 306 964 A discloses a magnetic core according to the preamble of claim 1.
  • the main object of the present invention is therefore to propose a rotating transformer magnetic core architecture which does not cause such disadvantages.
  • a rotary transformer magnetic core comprising bars arranged along a longitudinal axis of the core and at least two cheeks spaced axially from one another and extending radially from the bars to delimit with these at least one annular groove in which an O-coil is intended to be housed, and in which, in accordance with the invention, each cheek consists of a bundle of circular magnetic sheets which are arranged radially and in that the bars each consist of a plurality of stacks of magnetic sheets, the stacks of sheets forming the bars being arranged axially and assembled on the packets of circular sheets being spaced angularly from each other around the longitudinal axis of the core .
  • the core according to the invention is remarkable in that it comprises an arrangement of magnetic sheets allowing the magnetic flux to travel, firstly radially in the circular sheets forming the cheeks, and secondly axially in the sheets forming the bars.
  • Such a structure thus facilitates the assembly and industrialization of the "U-shaped" rotary transformer, in particular by limiting manufacturing tools and recovery operations.
  • the toroidal coils can be made and isolated prior to the constitution of the core.
  • the eddy current losses are minimized here by the lamination and the insulation between the different sheets.
  • the circular sheets forming each cheek may be segmented.
  • Such a segmentation of the circular sheets makes it possible to cancel the effects of the appearance in each circular sheet of a counter-electromotive force due to the magnetic field which embraces it.
  • the sectoring of the circular sheets makes it possible to eliminate the induced circular currents due mainly to the alternating field lines which enclose the sheets.
  • the circular sheets forming each cheek may each comprise radial notches forming internal baffles for extending the path of the current loops.
  • the circular sheets forming each cheek may have recesses.
  • the presence of these recesses provides a gain in mass, a reduction of leakage inductances and free passages for possible connections.
  • the sheets of the stacks forming each bar can be stacked in radial directions. Alternatively, these sheets can be stacked in tangential directions.
  • the packets of circular sheets forming the cheeks may comprise axial notches in which are assembled the stacks of sheets forming the bars.
  • the core may advantageously further comprise shims of non-magnetic material disposed between the flanks of each stack of sheets forming the bars and the sides of the notches of the circular plate packets.
  • the presence of such wedges reduces the appearance of eddy currents in the cheeks by reducing the input of a magnetic flux in a direction normal to the plane of the sheets.
  • the core may advantageously furthermore comprise an insulating material arranged in a bottom of the notches of the circular plate packets.
  • an insulating material arranged in a bottom of the notches of the circular plate packets.
  • the invention also relates to a rotary transformer comprising an inner annular core and an outer annular core concentrically mounted around a common longitudinal axis so that one of the cores can rotate relative to the other about said longitudinal axis at least one of the nuclei being a nucleus as defined above.
  • the invention applies to any rotating transformer (single-phase or polyphase) type "U" used to achieve an electric power transfer by electromagnetic induction between a fixed element and a rotary element such as the rotating three-phase transformer 10 shown in FIG. figure 1 .
  • this rotating transformer 10 comprises an inner annular core 12 and an outer annular core 14 which are mounted concentrically about a common longitudinal axis 16 so that one of the cores can rotate relative to the other around said longitudinal axis 16.
  • the inner core 12 comprises two outer annular grooves 18 in which are housed toric coils 20, while the outer core 14 comprises two internal annular grooves 22 facing external grooves 18 of the inner core and in which are also housed toroidal coils 24 .
  • a radial air gap 26 is provided between the inner diameter of the inner core 12 and the outer diameter of the outer core 14 so that it can rotate inside the inner core without physical contact with it.
  • the invention also applies to rotary single-phase transformers in which the cores comprise only one groove and two cheeks to accommodate a single toroidal coil.
  • the invention applies to other polyphase rotary transformers by varying the number of grooves and cheeks.
  • FIGS. 2 and 3 represent an external core 14 of such a rotating transformer according to one embodiment of the invention.
  • the invention also applies to the realization of the inner core.
  • the outer core 14 comprises bars 142 (also referred to as magnetic links, crowns or yokes) which are arranged along the longitudinal axis 16 of the rotating transformer, these bars being each constituted by a plurality of stacks of magnetic sheets, for example of rectangular shape, which are arranged axially.
  • bars 142 also referred to as magnetic links, crowns or yokes
  • these stacks of sheets forming each bar are 12 in number, are regularly distributed around the longitudinal axis 16 and are each composed of 17 rectangular sheets joined together with the interposition of an insulating layer.
  • these numbers could be different, as the shape of the sheets of these stacks is not necessarily rectangular.
  • the magnetic flux flows axially.
  • the outer core 14 also comprises three cheeks 144 (also referred to as circular cheeks or flanks) which are spaced axially from one another and which extend radially from the bars to delimit with them the two internal annular grooves 22 in which the toroidal coils 24 are intended to be housed, each cheek 144 being constituted by a bundle of circular magnetic sheets which are arranged radially and assembled between they with interposition of a layer of insulation.
  • cheeks 144 also referred to as circular cheeks or flanks
  • each flange 144 is thus constituted of a pack of 10 circular magnetic sheets in which the magnetic flux circulates radially.
  • the packets of circular sheets forming cheeks 144 each comprise axial notches 146 in which are assembled the stacks of sheets forming the bars 142.
  • the sheets of the stacks forming the bars 142 of the core are stacked in radial directions (that is to say that these sheets are arranged in a radial direction).
  • the figure 4 shows an alternative embodiment of an outer core 14 'in which the laminations of the stacks forming the bars 142' of the core have a different orientation, namely that they are stacked in tangential directions (i.e. these sheets are arranged in a tangential direction).
  • the cheeks 144 ' also comprise each of the axial notches 146' in which are assembled the stacks of sheets forming the bars 142 ', these sheets being for example 5 in number by stacking.
  • the plates forming the bars and circular sheets forming the cheeks of the core are typically non-oriented grain magnetic sheets which are covered with a layer of insulation and pressed together to allow their assembly in the form of packets and dies. stacks.
  • each circular sheet of circular plate packets forming cheeks 144, 144 has the disadvantage of being the seat of a counter electromotive force due to the magnetic field that embraces it.
  • each pack of circular sheets is segmented, for example into 4 segments 144a, 144'a, which are held together by means of gluing or mechanical holding via fastening elements such as screws, rivets or others, these fasteners having an insulation system with respect to the sheets so as to avoid a "re-looping" of the induced circular currents.
  • the number of segments may vary from 2 to about 30.
  • FIG. figure 6 Another solution for reducing the circular current loops induced in the circular sheets forming the cheeks of the magnetic core is shown in FIG. figure 6 . It consists in creating baffles by making radial notches (or slots) 148 in these circular sheets. As represented on this figure 6 , the current loop path (schematized by the line 150) is thus elongated.
  • shims of non-magnetic material 152 between the flanks of each stack of sheets forming the bars and the sides of the notches 146 of circular plate packets 144 in which are assembled the sheets forming the bars.
  • these shims 152 may be made of composite material with a polymer matrix or a non-ferromagnetic metallic material (for example an aluminum alloy).
  • this empty space can be filled with resin.
  • this insulating material 154 will be in the form of a very thin sheet (typically of the order of a few hundredths of a millimeter) made of fiberglass or in a polyimide or polyetheretherketone (PEEK) type polymer film. .
  • the insulating material may be a varnish or an adhesive adapted or made by creating a non-conductive space by placing stops preventing frank contact between the stacks of sheets forming the bars and cheeks.
  • each cheek 144, 144 'of the core have recesses 156 in them.
  • Such recesses 156 provide a gain in mass, a reduction of leakage inductances and free a passage for possible electrical connections.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Transformers For Measuring Instruments (AREA)
  • Coils Of Transformers For General Uses (AREA)
  • Insulating Of Coils (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
EP15778377.0A 2014-09-25 2015-09-24 Noyau magnetique de transformateur tournant Active EP3198617B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1459081A FR3026549B1 (fr) 2014-09-25 2014-09-25 Noyau magnetique de transformateur tournant
PCT/FR2015/052552 WO2016046499A1 (fr) 2014-09-25 2015-09-24 Noyau magnetique de transformateur tournant

Publications (2)

Publication Number Publication Date
EP3198617A1 EP3198617A1 (fr) 2017-08-02
EP3198617B1 true EP3198617B1 (fr) 2018-08-15

Family

ID=52130404

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15778377.0A Active EP3198617B1 (fr) 2014-09-25 2015-09-24 Noyau magnetique de transformateur tournant

Country Status (6)

Country Link
US (1) US10147539B2 (zh)
EP (1) EP3198617B1 (zh)
JP (2) JP2017535069A (zh)
CN (1) CN106796841B (zh)
FR (1) FR3026549B1 (zh)
WO (1) WO2016046499A1 (zh)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3726651A1 (de) * 2019-04-15 2020-10-21 Schaffner EMV AG Antenne
CN115038805A (zh) 2020-02-04 2022-09-09 株式会社神户制钢所 铝合金钎焊板

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1306964A (fr) * 1961-11-24 1962-10-19 Oerlikon Maschf Dispositif de transmission, sans bagues collectrices, de puissance électrique à des parties rotatives d'une machine
DE1638624A1 (de) * 1967-11-29 1971-08-26 Siemens Ag Anordnung zur kontaktlosen UEbertragung von Wechselstroemen auf umlaufende Maschinen und Geraete,insbesondere zur schleifringlosen Erregung von Synchronmaschinen
JPS491681Y1 (zh) * 1969-09-11 1974-01-17
JPS5515297Y1 (zh) * 1970-05-14 1980-04-09
JPS49126519U (zh) * 1973-02-28 1974-10-30
JPS5399416A (en) * 1977-02-14 1978-08-30 Toshiba Corp Rotary transformer
JPS6179514U (zh) * 1984-10-30 1986-05-27
JPH04326709A (ja) * 1991-04-26 1992-11-16 Matsushita Electric Ind Co Ltd 回転トランス
US5656983A (en) * 1992-11-11 1997-08-12 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Inductive coupler for transferring electrical power
JP3224890B2 (ja) * 1993-02-15 2001-11-05 ファナック株式会社 同期電動機のロータ
JPH08238326A (ja) * 1995-03-03 1996-09-17 Kaajiopeeshingu Res Lab:Kk 非接触エネルギー伝送システム用トランスの１次側コア
EP0908923B1 (en) * 1997-10-10 2003-04-02 European Community Apparatus to produce large inductive plasma for plasma processing
JP3816284B2 (ja) * 1998-12-28 2006-08-30 三菱電機株式会社 開閉装置
FR2892848B1 (fr) * 2005-10-27 2009-12-25 Centre Nat Etd Spatiales Transformateur tournant
DE102010063734B4 (de) * 2010-12-21 2017-01-12 Siemens Aktiengesellschaft Elektrische Maschine
JP2013198261A (ja) * 2012-03-19 2013-09-30 Denso Corp 回転電機の励磁装置
FR2990559B1 (fr) * 2012-05-10 2015-05-01 Hispano Suiza Sa Transformateur tournant triphase cuirasse magnetiquement a trois noyaux magnetiques
CN102664097B (zh) * 2012-06-06 2013-12-11 哈尔滨工业大学 双通道轴向磁路外转子磁阻式旋转变压器
FR2994762B1 (fr) * 2012-08-23 2015-11-20 Hispano Suiza Sa Transformateur tournant triphase-diphase a connexion scott

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
FR3026549A1 (fr) 2016-04-01
CN106796841A (zh) 2017-05-31
EP3198617A1 (fr) 2017-08-02
US10147539B2 (en) 2018-12-04
JP2017535069A (ja) 2017-11-24
US20180233278A1 (en) 2018-08-16
FR3026549B1 (fr) 2017-12-08
CN106796841B (zh) 2018-09-28
WO2016046499A1 (fr) 2016-03-31
JP2020184647A (ja) 2020-11-12

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