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
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
  • H02K11/04—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for rectification
  • H02K11/042—Rectifiers associated with rotating parts, e.g. rotor cores or rotary shafts
• • 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
  • H01F27/24—Magnetic cores
  • H01F27/255—Magnetic cores made from particles

Definitions

• the present invention relates to the field of power transfer between a fixed reference and a rotating reference for the electric defrosting of the propeller blades of an aircraft turbomachine and relates to a single-phase rotating transformer used for energy transmission electrical by electromagnetic induction between first and second electrical windings of this transformer.
• the protection envisaged for the rotating parts is generally exclusively electrothermal based on electric heating mats formed by layers of resistance covering the surfaces to be protected.
• slip ring whose principle consists of rubbing several fixed conductive rings secured to the fixed part on circular conductive tracks and secured to the rotating part, in order to create an electrical connection between the fixed part and the rotating part of the turbomachine.
• the main aim of the present invention is therefore a large diameter rotating transformer, segmented into quarters, the maintenance of which is facilitated and does not interfere with the other systems and modules of the turbomachine of the aircraft, despite its installation in an area confined, constrained and difficult to access.
• Another goal is to allow industrialization of this rotating transformer at lower cost and by limiting the waste of materials during manufacturing.
• a rotating transformer intended to be installed around a rotating movable shaft, the rotating transformer consisting 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 consisting 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 external stator and internal rotor rings, the internal and external magnetic cores being separated by two air gaps present on either side of the internal magnetic core, characterized in that at least the external magnetic cores have flares at each of the two air gaps to avoid a discontinuity of the field lines magnetic during the rotation of the movable shaft and in that the internal annular rotor sectors are identical and interchange
• the external annular stator sectors are identical and interchangeable with each other and the number of elementary stator and rotor magnetic circuits per annular sector is not identical to the stator and the rotor.
• the external annular stator sectors are electrically interconnected with each other by interconnection parts accessible for assembly/disassembly through circumferential access hatches and the internal annular rotor sectors are electrically interconnected with each other and accessible for assembly/disassembly through the circumferential access hatches.
• the internal and external magnetic cores are formed from a stack of sheets, rolled sheets or a block of magnetic powder.
• the stack of sheets is in the form of packs of sheets of a magnetic material such as FeSi, FeNi or FeCo, the sheets wound in the form of a magnetic material of the amorphous or nanocrystalline type, and the block of powder magnetic in the form of Amorphous powder.
• a magnetic material such as FeSi, FeNi or FeCo
• the external magnetic core has a C or U shape ending in the developments at the level of the air gap and the internal magnetic core has an H shape defining the developments at the level of the air gap.
• the expansions are formed by bars having a notch allowing the branches of the C or the U to be inserted there and thus providing a larger contact surface between the branches and the bars.
• the external U-shaped magnetic core comes from a cutting into two parts of a magnetic torus formed from a rolled sheet metal and the expansions come from a cut into four quarters of a torus cylindrical magnetic coiled sheet metal.
• the external magnetic core comes from a nesting of three packs of U-shaped sheets.
• the external magnetic core comes from a C-shaped part of which parts on either side of a central part have been machined to obtain the developments at the level of the air gap.
• Figure 1 illustrates a part of an aircraft turbomachine integrating a rotating transformer according to the invention
• FIG. 2 shows a quarter of the rotating transformer of Figure 1
• Figure 3 shows a first example of stator and rotor magnetic circuits composing the rotating transformer quarter of Figure 2,
• Figure 4 shows a second example of stator and rotor magnetic cores composing the rotating transformer quarter of Figure 2,
• Figure 5 shows a third example of stator and rotor magnetic cores composing the rotating transformer quarter of Figure 2,
• FIG. 6 illustrates a variant of the stator for the third example of stator and rotor magnetic cores composing the rotating transformer quarter of Figure 2
• FIG. 7 shows a fourth example of stator and rotor magnetic cores composing the rotating transformer quarter of Figure 2
• Figure 8 shows a fifth example of stator and rotor magnetic cores composing the rotating transformer quarter of Figure 2.
• the principle of the invention implemented is based on a segmentation of the rotating transformer 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 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 rotating transformer 10 is mounted between a transmission shaft 12 movable in rotation 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 quarters or annular sectors of the rotating transformer can be installed or easily removed for repair or maintenance then reinstalled once these replacement interventions have been carried out.
• Figure 2 illustrates more precisely an annular sector or quarter 20 of the rotating transformer 10 which in the example illustrated comprises two redundant channels (bearing the references a and b) axially offset, each consisting of a fixed stator quarter 22a, 22b secured to the casing and a rotating rotor quarter 24a, 24b secured to the transmission shaft, the rotor and stator quarters of each channel, mounted concentrically, being separated by an air gap (visible in the following figures).
• the rotating transformer formed by the juxtaposition over 360° of several quarters 20 has a large diameter, of the order of a meter and more, which allows the rotor to receive a transmission shaft also of large diameter, such as a propeller shaft.
• the 360° juxtaposition of these different annular sectors to the stator and the rotor form an outer stator ring and an inner rotor ring made up of a plurality of single-phase elementary stator and rotor magnetic circuits respectively comprising a magnetic core stator 30 and a first electric winding (primary 32) and a rotor magnetic core 34 and a second electric winding (secondary 36), the stator and rotor magnetic cores being separated by the same air gap present on either side of the rotor magnetic core and the sectors which 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.
• annular sectors are identical and interchangeable with each other.
• the number of these elementary magnetic circuits per annular sector is not necessarily identical to the stator and the rotor, the choice of the number of magnetic circuits to the stator and the rotor being guided by design and performance optimization considerations. transfer.
• An annular sector at the stator or rotor is designed as an LRU (Line Replaceable Unit) removable and replaceable under the wing through the circumferential access hatches 14a. They are interconnected electrically by interconnection parts (not referenced) also accessible for assembly/disassembly through the circumferential access hatches 14a.
• LRU Line Replaceable Unit
• annular sector in the stator or rotor is constituted by all the elements of two identical channels placed side by side in the axial plane.
• the type of material used for the magnetic core may be different.
• a stacking in the form of packs of sheets of a magnetic material such as FeSi, FeNi or FeCo is envisaged for the stator as for the rotor.
• a magnetic core in rolled 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) is envisaged for the stator and the rotor .
• a mixture of materials is however possible with a stator made of medium or high frequency material and a rotor made of low frequency material or vice versa.
• Figures 3 to 8 show different possible topologies for each elementary magnetic circuit at the stator and at the rotor allowing the production of the rotating transformer according to the invention.
• a magnetic circuit can be installed horizontally (axial air gap as illustrated) or vertically (radial air gap).
• stator magnetic cores or external stator 30
• developments 30a, 30b at each of the two air gaps 38a, 38b which correspond to the stator and which, by avoiding a discontinuity of the lines of Magnetic fields during the rotation of the movable shaft improve the efficiency of power transfer.
• the rotor magnetic cores (or internal rotor 34) may also have developments 34a, 34b or not (see for example Figures 5 and 6).
• the electrical windings 32, 36 which are not represented in Figures 4 to 8 showing only the stator and rotor magnetic cores, can be wired or in ribbons depending on the different constraints of integration and performance to be respected, and the series of three lines appearing on the magnetic cores tend to show the arrangement of the constituent sheets.
• the external magnetic or stator core 30 has a U-shape ending in developments 30a, 30b at the level of the two axial air gaps 38a, 38b.
• the internal magnetic or rotor core 34 has an H shape defining developments 34a, 34b at the level of these two axial air gaps present on either side of the internal magnetic core 34.
• Figure 4 is presented an economical embodiment without waste of materials corresponding to use at medium or high frequency and in which the internal magnetic core 40 has an H shape obtained by a stack of sheets in the vertical plane and the external magnetic core 42 is made up of an assembly of three parts, namely a U-shaped part 44 resulting from a cutting into two parts of a magnetic torus formed from a rolled sheet metal and two flares 46, 48 resulting from a cutting in four quarters of a round of a cylindrical magnetic torus of wound sheets.
• the shape of the flares can of course be adapted for reasons of mass saving by modifying the width at the junction surface between the flare and the U-shaped part 44.
• the external magnetic core 50 in the shape of a C is cut out at the level of the air gap to leave room for the addition of a bar 52, 54 on each side of the cutout to form the flares between which the internal magnetic core 56 in the shape of an I, therefore without expansions, is placed.
• these bars 52, 54 can advantageously each have a notch 58 allowing the branches 50a, 50b of the C-shaped part to be inserted there and thus provide a contact surface between the two parts (C /bar) more important.
• the internal magnetic core 60 also has an H shape by a stack of sheets in the vertical plane and the external magnetic core 62 is composed of an interlocking of three packs of sheets 64, 66, 68 in the shape of a U.
• Figure 8 shows another example of a particularly robust embodiment with an external magnetic core obtained by the simple machining of a C-shaped part 70 having an initial width equal to that of the developments at the level of the air gap as shown.
• the material corresponding to the parts 72, 74 and without touching the parts 76, 78 forming the flares, is removed along the cutting lines illustrated in dotted lines in the figure to leave only the central part 80.
• the internal magnetic core (not shown) can be H-shaped or I-shaped.

Landscapes

• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Iron Core Of Rotating Electric Machines (AREA)
• Recording Or Reproducing By Magnetic Means (AREA)
• Transmission And Conversion Of Sensor Element Output (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=82319976

Family Applications (1)

Country Status (5)

Family Cites Families (3)

• 2022
  • 2022-04-25 FR FR2203815A patent/FR3134916B1/fr active Active
• 2023
  • 2023-04-19 WO PCT/FR2023/050559 patent/WO2023209310A1/fr not_active Ceased
  • 2023-04-19 US US18/857,619 patent/US20250279703A1/en active Pending
  • 2023-04-19 EP EP23725286.1A patent/EP4515580A1/de active Pending
  • 2023-04-19 CN CN202380036332.2A patent/CN119137694A/zh active Pending

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