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
  • H01F27/26—Fastening parts of the core together; Fastening or mounting the core on casing or support
  • H01F27/263—Fastening parts of the core together

Definitions

• the subject of the present invention is a rotating transformer with easy installation. It essentially concerns rotary transformers of the single-phase type used to carry out an electric power transfer between a fixed element and a moving element, typically in rotational movement, in particular in the context of the recovery of position information by sensors intervening for variable blade pitch and helicopter pitch adjustment.
• the field of the invention is, in general, that of rotary transformers which are used for the transmission of electric energy by electromagnetic induction between first and second coils respectively fixed concentrically on first and second tubular parts, made of material ferromagnetic, mounted coaxially so that an outer surface of one can rotate facing an inner surface of the other.
• rotating transformers are space industries, for example for transmitting a power supply to a measuring instrument mounted on a support plate in a satellite. rotating joint to orient it to the stars.
• Such rotary transformers are also used in the aeronautical industry, especially for torque sensors, for example for uses for setting the pitch of the propeller for helicopters.
• Specific functions, known as "de-icing of the tail rotor" and “pitch control” may also require a transfer of electrical power.
• the removal of the conventional brush collector and its replacement by such a transformer are advantageous.
• Such a transformer makes it possible to make the equipment reliable by eliminating the risk of failure caused by the wear of the brushes.
• FIGS. 1 and 2 of the accompanying drawings show diagrammatically rotary transformers of known types.
• the one shown in FIG. 1 essentially comprises two parts 1 and 2, respectively corresponding to an inner core and an annular ring-shaped outer core, mounted concentrically so that one can rotate relative to the other around a common axis X, parts 1 and 2 being hollowed with annular grooves 3 and 4 respectively in which are housed electric windings 5 and 6 respectively.
• the inside diameter of the part 1 is slightly greater than the outside diameter of the part 2 so that the latter can rotate in the part 1 without physical contact therewith. Radial gaps are thus cleaned, usually of the order of 0.1 mm thick, on either side of the coils.
• a transformer comprising two rings 1 'and 2' rotatable about the same axis X ', two axial ends arranged opposite these rings being hollowed out with two annular grooves 3 'and 4' respectively, accommodating windings 5 'and 6' respectively.
• the gaps disposed on either side of the coils are axial.
• the object of the invention proposes a solution to the problems that have just been exposed.
• the present invention is precisely to achieve a rotating transformer unaffected by the limitations mentioned above.
• the invention essentially proposes a rotary transformer whose proposed topology allows installation or removal of said transformer around a shaft without manipulation, in particular without sliding operation of the shaft in the core of the transformer. .
• the rotating transformer according to the invention also makes it possible to solve a problem frequently encountered in rotating transformers of the state of the art: in existing rotary transformers, the material type of the internal shaft can affect the transformer characteristics. , in particular the characteristics of magnetising inductance, of leakage inductance, or the characteristics of efficiency. Indeed, if the internal shaft is a magnetic flux conductor, there is an increase in the reluctance of the magnetic circuit formed by the cores of the rotating transformer. In advantageous embodiments of the invention, the characteristics of the transformer are independent of the tree in question.
• the invention therefore essentially relates to a rotary transformer intended to be installed around a rotatable shaft, said rotary transformer comprising in particular an annular inner core and an annular outer core for the transmission of electrical energy by electromagnetic induction between said inner core. and said outer core coaxially mounted so that an inner surface of the outer core is rotatable facing an outer surface of the inner core, characterized in that the inner core is comprised of a plurality of disjoint inner core portions assembled by a first fastening means, and in that the outer core consists of a plurality of disjoint outer core portions joined by a second fastening means.
• the rotary transformer according to the invention may have one or more additional characteristics among the following, considered individually or in any technically possible combination:
• the disjoint portions of the inner core have identical shapes and dimensions
• the disjoint portions of the outer core have identical shapes and dimensions
• each disjointed portion of inner core and each disjointed portion of outer core comprises an electric winding
• each disjointed portion of inner core and / or outer core has a first lateral groove and a second lateral groove in which the electrical winding of the portion under consideration passes;
• each disjointed portion of inner core and / or outer core has an annular groove, present on the inner face and / or on the outer face of the portion in question, in which passes the electric winding of the portion considered;
• the first fastening means and / or the second fastening means consists of a strapping armatures disjoint portions of the inner core and / or the outer core;
• the first fastening means and / or the second fastening means comprises bolts arranged at armatures disjoint portions of the inner core and / or the outer core;
• two joined inner core disjoint portions have a first planar joining surface and in that two joined outer core disjoint portions have a second planar joining surface, each first planar joining surface and each second planar joining surface being radially aligned. ;
• the inner core and the outer core each consist of two disjoint core portions.
• FIG. 5 a detailed representation of a first exemplary embodiment of a rotary transformer according to the invention
• FIG. 4 The general principle of rotating transformers according to the invention is illustrated in FIG. 4.
• This figure shows a shaft 401, at the ends of which there are flares 402, which make it impossible to install a rotary transformer of the invention. state of the art by a sliding operation along the shaft 401.
• a rotary transformer 400 comprising an annular inner core 403 and an annular outer core 404 both consisting of several parts, or portions, disjoint.
• disjoint portion of a core is meant an element intended to contribute to the formation of a closed annular magnetic core by juxtaposition with other core portions.
• the inner core 403 consists of a first half-core 405 and a second half-core 406, and the outer core 404 consists of a first half-core 407 and a second half-core 406. a second half-core 408.
• the shaft 401 of a rotating transformer By proposing internal and external cores composed of disjoint parts, one can equip the shaft 401 of a rotating transformer by placing, by a directly lateral positioning, the half-cores which have just been mentioned around the shaft 401, and assembling them together to reconstruct an annular inner core, and an annular outer ring of rotating transformer.
• Each of the half-cores considered includes an electrical winding whose characteristics, including positioning, will be described in detail later.
• FIG. 5 shows in more detail the rotary transformer 400 of FIG. 4, with a front view 500, a bottom view 501 and a profile view 502 of said transformer 400.
• the various electrical windings present in the rotating transformer 400.
• each ring (internal and external) annular constituting the rotating transformer consists of a plurality of parts of rings.
• the ring portions constituting it advantageously have the same shapes and dimensions.
• the ring portions are thus portions of annular rings, each having a first lateral portion 51 1 and a second lateral portion 512, each lateral portion of a given ring portion being intended to be positioned facing a portion side of part next ring, so that the assembly of the correctly positioned ring parts effectively forms an annular core.
• each disjoint portion of core comprises an electric winding wound around it.
• the half-cores 405, 406, 407 and 408 respectively comprise an electrical winding 505, 506, 507 and 508.
• each electrical winding is arranged around the disjoint element associated with it by carrying out a winding making a plurality of passages around said disjoint element considered, each of the passages of the winding considered being generally contained in a plane perpendicular to a central axis X of the rotating transformer.
• the electrical winding of each part matches the curvature of the ring parts with which it is associated.
• a groove 513 designated as a lateral groove, at the side portions of the each ring part considered.
• the size of the grooves is such that two electrical windings of two portions of consecutive disjoint rings do not come into contact when the two ring elements are assembled.
• annular groove 514 that is to say a groove dug along the curved portion of the portion considered, in order to pass the electric winding.
• the annular grooves are grooves made at the internal faces of the ring portions constituting the inner core and the outer core. On the internal face of a core portion, the curved face of smaller dimension is designated, the external face being the face of larger dimension.
• annular grooves are provided at the outer faces, instead of the annular grooves of the internal faces, or in addition to the annular grooves of said inner faces. The production of annular grooves essentially makes it possible to eliminate the risks of contact between the electric windings arranged on the outer cores and on the internal cores, to increase a gap 515 between the inner and outer cores, or to limit the size of the rotating transformer.
• Each electrical winding has an inlet end 516-E and an outlet end 516-F which are its own.
• the electric windings of the different portions constituting the inner core are fed by the same first current source.
• the electrical windings of the different portions constituting the outer core are fed by the same second current source, possibly different from the first current source.
• the transformers according to the invention show a circulation of magnetic flux in a zone 600 internal to the magnetic core constituted by the inner core and the outer core.
• the magnetic flux is thus channeled into the magnetic core, without circulation in the internal shaft around which the transformer according to the invention is arranged.
• the characteristics of the transformer are thus independent of the mechanical shaft, and they are little impacted by a low translation of the transformer rotating along the axis of the mechanical shaft.
• Figure 7 shows a schematic representation of the rotating transformer of Figure 5, in perspective, with an inner core out of the outer core to better visualize the shape of the various elements constituting the rotating transformer.
• the inner and outer cores are each composed of only two half-cores, in other exemplary embodiments, it is expected that the inner and outer cores comprise more than two disjoint parts.
• FIG. 8 shows a schematic representation of a second exemplary rotating transformer 800 according to the invention, with each annular core (external and internal) consisting of three ring parts.
• the representation is a perspective representation, with a internal core out of the outer core to better visualize the shape of the various elements constituting the rotating transformer.
• two joined inner core disjoint portions have a first junction plane surface 702, two joined outer core disjoint portions having a second junction plane surface 701, each first planar surface.
• junction 702 and each second planar joining surface 701 being radially aligned, as can be seen in particular in FIGS. 7 and 8.
• Figure 9 shows a first example of assembly of the different portions of disjoint nuclei; in this first example, a strapping 901 is made at the level of reinforcements 601 - visible in particular in FIG. 6 - arranged on the portions of cores at the level of the lateral walls oriented along a plane perpendicular to the axis X.
• Figure 10 shows a second example of assembly of the different portions of disjoint nuclei; in this second example, an assembly is made by bolts 91 1, said bolts 91 1 being disposed at the level of the reinforcements 601.
• the disjoint portions of the inner core are assembled by a first fixing means, the disjoint portions of the outer core being joined by a second fastening means, the first fastening means and the second fastening means. not necessarily identical.

Landscapes

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

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

Country Status (9)

Families Citing this family (7)

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• 2009
  • 2009-11-30 FR FR0958487A patent/FR2953321B1/fr not_active Expired - Fee Related
• 2010
  • 2010-11-30 CN CN2010800543633A patent/CN102640235A/zh active Pending
  • 2010-11-30 BR BR112012013062A patent/BR112012013062A2/pt not_active IP Right Cessation
  • 2010-11-30 WO PCT/EP2010/068454 patent/WO2011064377A1/fr active Application Filing
  • 2010-11-30 JP JP2012541450A patent/JP2013513231A/ja active Pending
  • 2010-11-30 RU RU2012127359/07A patent/RU2012127359A/ru not_active Application Discontinuation
  • 2010-11-30 EP EP10784790A patent/EP2507803A1/fr not_active Withdrawn
  • 2010-11-30 US US13/512,405 patent/US20120280777A1/en not_active Abandoned
  • 2010-11-30 CA CA2782033A patent/CA2782033A1/fr not_active Abandoned

Non-Patent Citations (1)

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