WO2025003595A1 - Transformateur tournant segmente standardise a grand diametre - Google Patents
Transformateur tournant segmente standardise a grand diametre Download PDFInfo
- Publication number
- WO2025003595A1 WO2025003595A1 PCT/FR2024/050806 FR2024050806W WO2025003595A1 WO 2025003595 A1 WO2025003595 A1 WO 2025003595A1 FR 2024050806 W FR2024050806 W FR 2024050806W WO 2025003595 A1 WO2025003595 A1 WO 2025003595A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- stator
- rotor
- annular
- internal
- sectors
- 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.)
- Ceased
Links
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
Definitions
- the present invention relates to the field of power transfer between a fixed reference point and a rotating reference point for the electrical (electrothermal) defrosting of the propeller blades of an aircraft turbomachine and relates to a single-phase rotating transformer used in a harsh environment for the contactless transmission of electrical energy by electromagnetic induction between first and second electrical windings of this transformer.
- the main purpose of the present invention is therefore a large diameter rotating transformer, segmented into quarters, whose maintenance is facilitated and does not interfere with the other systems and modules of the aircraft turbomachine, despite its installation in a confined, constrained and difficult to access area.
- Another purpose is to propose a transformer allowing simplified but robust control.
- Yet another purpose is to allow industrialization of this rotating transformer at a lower cost, while limiting material waste during manufacturing.
- a rotating transformer intended to be installed around a rotating movable shaft, the rotating transformer being made up of a plurality of external annular stator sectors and a plurality of internal annular rotor sectors, the juxtaposition over 360° of these external annular stator and internal rotor sectors forming an external stator ring and an internal rotor ring made up of a set of elementary stator and rotor magnetic circuits, each of the elementary stator magnetic circuits comprising an external magnetic core and a first electrical winding and each of the elementary rotor magnetic circuits comprising an internal magnetic core and a second electrical winding to allow a transfer of electrical energy by electromagnetic induction between the outer stator and inner rotor rings, the inner and outer magnetic cores being mounted concentrically and separated by two air gaps present on either side of the inner magnetic core, the outer magnetic cores each have a C-claw shape and the inner magnetic cores each have an I-bar shape and in that the outer magnetic cores and/or the inner magnetic cores have at each of the air
- the internal and external magnetic cores are formed from a radial stack of wound sheets of a magnetic material of the amorphous or nanocrystalline type or from a block of magnetic powder made from amorphous powder.
- the C-shaped external magnetic core is produced by cutting to the size of the internal magnetic core, the annular expansions and the air gaps, i.e. from a standard oblong-shaped magnetic element consisting of a radial stack of wound sheets.
- the number of annular sectors in the stator is or is not the same as the number of annular sectors in the rotor and the number of external magnetic cores per external annular sector of the stator is or is not the same as the number of internal magnetic cores per internal annular sector of the rotor.
- the stator winding which can be wire or ribbon winding is either a concentric winding around each external magnetic core or a single winding surrounding all the external magnetic cores of a given annular sector and the rotor winding which can be wire or ribbon winding is either a concentric winding around each internal magnetic core or a single winding surrounding all the internal magnetic cores of a given annular sector.
- the annular expansions have notches to facilitate their assembly on the internal or external magnetic cores.
- the external annular stator sectors are identical and interchangeable with each other and/or the internal annular rotor sectors are identical and interchangeable with each other.
- the external annular stator sectors are electrically interconnected with each other by flexible interconnection parts accessible for assembly/disassembly through circumferential access hatches and/or the internal annular rotor sectors are electrically interconnected with each other by flexible interconnection parts accessible for assembly/disassembly through the circumferential access hatches.
- these electrical interconnection parts for both the stator and the rotor must be flexible (braid type or equivalent) and not mechanically structural in order to limit (or even avoid) the transmission of mechanical forces between adjacent sectors.
- FIG. 1 Figure 1 illustrates a part of an aircraft turbomachine integrating a rotating transformer according to the invention
- Figure 2 shows a district of the rotating transformer of Figure 1
- Figures 3A and 3B show an exemplary embodiment of an external stator magnetic core composing the rotating transformer district of Figure 2
- FIG. 4A shows a segment of the stator quarter making up the rotating transformer quarter of Figure 2
- Figure 4B shows a segment of the rotor quarter making up the rotating transformer quarter of Figure 2
- Figure 5 illustrates a first example of a rotating transformer district segment according to the invention
- Figure 6 illustrates a second example of a rotating transformer district segment according to the invention
- Figure 7 shows a third example of a rotating transformer district segment according to the invention.
- Figure 8 shows a fourth example of a rotating transformer district segment according to the invention.
- the principle of the invention implemented is based on a segmentation of the rotating transformer, at the stator (called primary) as at the rotor (called secondary), into several annular sectors or quarters each having a mass and a replacement time compatible with a ground maintenance operation limiting the downtime of the aircraft, so that the maintenance and replacement interventions (assembly/disassembly) are facilitated and can be carried out by conventional tools through dedicated access hatches, without having to disassemble or interfere with the other parts of the aircraft turbomachine.
- the annular stator sectors are identical and interchangeable with each other and the annular rotor sectors are identical and interchangeable with each other. Power transfer between the stator and the rotor is done by electromagnetic induction and without contact.
- the stator is powered by dedicated electronics (resonant or non-resonant single-phase inverter) operating preferably at high frequencies (several tens of kilohertz), without this being limiting.
- the rotating transformer 10 As shown in FIG. 1, which is a part of an aircraft turbomachine, the rotating transformer 10 according to the invention is mounted between a rotating transmission shaft 12 forming a rotating part of the turbomachine and a casing 14 forming a fixed part of the turbomachine, provided with circumferential access hatches 14A through which each of the annular quarters or sectors of the rotating transformer 10 can be installed or easily removed for repair or maintenance and then reinstalled once these replacement operations have been carried out.
- Figure 2 illustrates more precisely an example of an annular sector or quarter 20 of the rotating transformer 10 (which in the illustrated example comprises a single path but two axially offset redundant paths would also be possible) consisting of a fixed stator quarter 22 secured to the housing and a rotating rotor quarter 24 secured to the transmission shaft, the rotor quarter being mounted concentrically (inserted) in the stator quarter to form the transformer quarter while maintaining axial mechanical clearance on either side of the rotor quarter.
- the rotating transformer formed by the juxtaposition over 360° of several quarters 20 has a large diameter, of the order of a meter or more, which allows the rotor to receive a transmission shaft also of large diameter, such as a propeller shaft.
- the juxtaposition over 360° of these different annular sectors to the stator and to the rotor form an external stator ring and an internal rotor ring consisting of a plurality of single-phase elementary stator and rotor magnetic circuits comprising respectively a stator magnetic core 30 and a first electrical winding (primary 32) and a rotor magnetic core 34 and a second electrical winding (secondary 36), the stator and rotor magnetic cores being separated by two air gaps e1 and e2 present on either side of the rotor magnetic core (see Figure 5) and the sectors that can be electrically interconnected in series or in parallel for the transmission of electrical energy by electromagnetic induction between the first and second electrical windings of these elementary magnetic circuits of stator and rotor.
- the annular sectors are identical and interchangeable with each other.
- the number of these elementary magnetic circuits per annular sector is not necessarily identical at the stator and at the rotor (for example four at the stator and six at the rotor as illustrated), the choice of the number of magnetic circuits at the stator and at the rotor being guided by design considerations and optimization of transfer performances.
- the numbers of magnetic circuits at the stator and rotor which can be different, the number of sectors at the stator can also be different from the number of sectors at the rotor.
- An annular sector on the stator or rotor is designed as a removable and replaceable LRU (Line Replaceable Unit) under the wing through dedicated circumferential access hatches 14A. They are electrically interconnected by flexible interconnection parts (not referenced) also accessible for assembly/disassembly through the circumferential access hatches 14A.
- LRU Line Replaceable Unit
- the type of material used for the magnetic core or the expansions may be different for the stator and the rotor (for example, winding or stacking of FeNi type sheets, or another material such as FeSi or FeCo, for the stator and powder block for the rotor).
- a magnetic core made of wound sheet metal of amorphous or nanocrystalline type or in the form of a powder block of any other suitable magnetic material for example, Amorphous powder
- Amorphous or Nanocrystalline type materials makes it possible to reduce the size and mass of the transformer as well as its losses.
- stator magnetic cores or external stator cores 30
- cores rotor magnetic or internal rotor 34
- the expansions are intended to avoid a discontinuity of the magnetic field lines during rotation, thereby improving the transfer efficiency and simplifying the management of the resonant mode by simplified control independent of the rotation (limited variations of the transformer parameters according to the angular position).
- the magnetic core of the stator 30 is obtained from an assembly of two elements: a standard C-shaped magnetic element 40 (better known by the acronym C-core) resulting from a cutting of a radial stack of wound sheets 42 around a common axis, and an annular expansion 44 resulting from the cutting of a magnetic circular ring 46 made of a radial stack of circular sheets predefined to the correct diameter.
- the circular ring is cut into a determined number of annular sectors intended to constitute the complete transformer.
- the magnetic core of the rotor 34 is obtained from an assembly of two elements: a standard I-shaped magnetic element 48 (a simple bar visible in FIG. 8) and the same annular expansion 44 resulting from the cutting of the same circular ring 46 made from a radial stack of circular sheets predefined to the correct diameter on the same principle as the stator.
- the assembly of the expansions on the C-cores and the I-shapes can be provided with notches 44a, 44b, 44c, 44d.
- the cutting of notches would not be feasible (case of a material such as Amorphous)
- the use for example of FeNi for the expansions can then be envisaged.
- the stator winding is a concentric winding 50 around each C-core.
- the rotor winding is a concentric winding 52 around each I-member.
- the windings may be wired or in ribbons depending on the different integration and performance constraints to be respected.
- stator coils at an annular sector are interconnected in series with each other.
- the annular sectors are also interconnected in series with each other to form the primary winding of the complete transformer. The same principle of interconnection between sectors and within each sector is implemented for the rotor.
- the magnetic cores of the stator 40 comprise annular expansions 44 at each of their two ends, but a configuration without expansions is also possible, as will be shown further with reference to FIG. 7.
- the magnetic cores of the rotor 48 comprise annular expansions 44 at each of their two ends, but a configuration without expansions is also possible, as will be shown further with reference to FIG. 6.
- Figure 5 illustrates a first example of a segment (a portion having two stator magnetic cores) of a transformer quarter in which the stator magnetic cores 40 and the rotor magnetic cores 48 each have annular expansions 44, with air gaps e1 and e2 between these annular expansions at the stator and rotor.
- the stator winding is formed of the concentric coils 50 around each C-core claw element and the rotor winding is formed of the concentric coils 52 around each I-shaped element.
- Figure 6 illustrates a second example of a segment (a part comprising two stator magnetic cores) of a transformer district in which only the stator magnetic cores 40 each comprise annular expansions 44 (provided with notches in this example), the air gaps e1 and e2 then being located between these annular expansions of the stator and the cores rotor magnetics 48.
- the stator windings are concentric windings
- Figure 7 illustrates a third example of a segment (a portion comprising two stator magnetic cores) of a transformer quarter in which only the rotor magnetic cores 48 each comprise annular expansions 44, the air gaps e1 and e2 then being located between these annular expansions of the rotor and the stator magnetic cores 40.
- the stator windings are concentric windings 50 around each C-core element and the rotor windings are concentric windings 52 around each I-element.
- Figure 8 illustrates a fourth example of a segment (a portion having two stator magnetic cores) of a transformer quarter in which the stator magnetic cores 40 and the rotor magnetic cores 48 each have annular expansions 44, with air gaps e1 and e2 between these annular expansions at the stator and rotor.
- the stator windings are formed by a single winding 54 surrounding all the C-core elements of a given transformer annular sector and the rotor windings are formed by a single winding 56 surrounding all the I-elements of the same given transformer annular sector.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Synchronous Machinery (AREA)
Abstract
Description
Claims
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP24738348.2A EP4736201A1 (fr) | 2023-06-27 | 2024-06-19 | Transformateur tournant segmente standardise a grand diametre |
| CN202480043826.8A CN121444187A (zh) | 2023-06-27 | 2024-06-19 | 标准化分段式大直径旋转变压器 |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FRFR2306694 | 2023-06-27 | ||
| FR2306694A FR3150634A1 (fr) | 2023-06-27 | 2023-06-27 | Transformateur tournant segmenté standardisé à grand diamètre |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2025003595A1 true WO2025003595A1 (fr) | 2025-01-02 |
Family
ID=88207491
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/FR2024/050806 Ceased WO2025003595A1 (fr) | 2023-06-27 | 2024-06-19 | Transformateur tournant segmente standardise a grand diametre |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP4736201A1 (fr) |
| CN (1) | CN121444187A (fr) |
| FR (1) | FR3150634A1 (fr) |
| WO (1) | WO2025003595A1 (fr) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010081654A1 (fr) * | 2009-01-14 | 2010-07-22 | Rolls-Royce Plc | Transformateur rotatif |
| FR2953321A1 (fr) * | 2009-11-30 | 2011-06-03 | Hispano Suiza Sa | Transformateur tournant a installation facilitee |
-
2023
- 2023-06-27 FR FR2306694A patent/FR3150634A1/fr active Pending
-
2024
- 2024-06-19 WO PCT/FR2024/050806 patent/WO2025003595A1/fr not_active Ceased
- 2024-06-19 EP EP24738348.2A patent/EP4736201A1/fr active Pending
- 2024-06-19 CN CN202480043826.8A patent/CN121444187A/zh active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010081654A1 (fr) * | 2009-01-14 | 2010-07-22 | Rolls-Royce Plc | Transformateur rotatif |
| FR2953321A1 (fr) * | 2009-11-30 | 2011-06-03 | Hispano Suiza Sa | Transformateur tournant a installation facilitee |
Also Published As
| Publication number | Publication date |
|---|---|
| FR3150634A1 (fr) | 2025-01-03 |
| CN121444187A (zh) | 2026-01-30 |
| EP4736201A1 (fr) | 2026-05-06 |
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