EP3028368A2 - Rotor with permanent magnets - Google Patents

Rotor with permanent magnets

Info

Publication number
EP3028368A2
EP3028368A2 EP14750573.9A EP14750573A EP3028368A2 EP 3028368 A2 EP3028368 A2 EP 3028368A2 EP 14750573 A EP14750573 A EP 14750573A EP 3028368 A2 EP3028368 A2 EP 3028368A2
Authority
EP
European Patent Office
Prior art keywords
rotor
housing
permanent magnets
axis
magnets according
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.)
Withdrawn
Application number
EP14750573.9A
Other languages
German (de)
French (fr)
Inventor
Khadija El Baraka
Svetislav JUGOVIC
Frédéric Palleschi
Jérome Legranger
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.)
Valeo Equipements Electriques Moteur SAS
Original Assignee
Valeo Equipements Electriques Moteur SAS
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 Valeo Equipements Electriques Moteur SAS filed Critical Valeo Equipements Electriques Moteur SAS
Publication of EP3028368A2 publication Critical patent/EP3028368A2/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
    • H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
    • H02K1/2766—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect
    • H02K1/2773—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect consisting of tangentially magnetized radial magnets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information

Definitions

  • the invention relates to a rotor for an electric machine.
  • the invention finds a particularly advantageous, but not exclusive, application with current generators or generators.
  • Electrical machines comprising a stator and a rotor with permanent magnets secured to a shaft.
  • the rotor may be integral with a driving and / or driven shaft and may belong to a rotating electrical machine in the form of an alternator or current generator as described in document EP 0 803 962 or of an electric motor as described. in EP 0 831 580.
  • the shaft can ensure the setting in motion of a scroll compressor, also known as "scroll compressor".
  • Such a system comprises two spirals interposed as pallets for pumping and compressing the refrigerant. In general, one of the turns is fixed, while the other moves eccentrically without turning, so as to pump and then imprison and finally compress fluid pockets between the turns.
  • the machine comprises a housing carrying the stator. This housing is configured to rotate the shaft for example by means of rolling, such as ball bearings and / or needle.
  • the rotor comprises a body made of laminated sheet metal, which comprises housings. Inside some of the dwellings, is positioned at less a permanent magnet. There are tolerances used in the realization of the rotor which make it possible that the magnets are badly plated inside the housing of the rotor; this can be troublesome given the action of the centrifugal force to which the magnets can be subjected. Solutions have been developed to remedy this aspect.
  • CN202221930 describes a permanent magnet rotor comprising:
  • the problem posed here is to reduce the magnetic flux leakage paths of the rotor without negatively impacting the mechanical strength of the rotor.
  • one of the objectives here is to avoid that mechanical stress concentrations that can occur in the vicinity of the housing of the magnet does not adversely affect the life of the rotor because of its operation.
  • it is a question of proposing a rotor with permanent magnets, easy to produce, inexpensive, durable and presenting a compromise between the prevention of magnetic flux leakage paths and the mechanical strength of the rotor body.
  • the solution proposed by the present invention is that recesses are formed in the body and positioned between the housing on a path successively connecting the protruding portions of the consecutive housing.
  • the magnet is held radially and axially by means of a holding device extending axially inside the housing between the inner axial portion of the housing and said axial face of the magnet.
  • This holding device advantageously has a spring effect for holding the magnets when it is placed in one of the housings 9. Such an arrangement prevents unwanted sliding of the magnet relative to its housing during operation of the rotor at high rotational speed. Indeed, the spring effect of the holding device makes it possible to object to a force opposing the centrifugal force.
  • the concave portions have outer contours formed by lines in an arc.
  • the arcuate lines of the outer contours of the concave portions make it possible to progressively refine the thickness of material between the housing and the recess and improve the mechanical strength of the rotor body, in particular in the vicinity of the housing and the recess.
  • the arrangement combining the radially projecting portion at greater proximity to the axial face of the magnet than the two concave portions and progressive refinement of the material thickness between the housing and the recess via arcuate lines. allows to answer these two problems and propose a good compromise.
  • the projecting portion has a first facet having a medium (M) defining the center of the lines in an arc.
  • the arcuate lines of the outer contours of the concave portions have a common circle center.
  • the center of the circle is included in a plane passing through the axis (X) and is included radially in the housing.
  • the radius of curvature of the arcuate lines is substantially equal to half a width of the housing.
  • the recess has two first sides, each of said first sides extending substantially parallel to a radial face of the nearest housing.
  • the thickness between the radial face of a housing and the side of a subsequent recess is thinned to limit the magnetic leakage paths.
  • the radial face of the magnet is substantially orthogonal to the first facet of the protruding portion.
  • the magnet being guided radially by the radial faces of the housing, this advantageously makes it possible to transfer the forces from the protruding portion to the magnet via the first facet; a greater proportion of the stresses is transferred radially into the magnet, which reduces the stresses between the recess and the housing of the magnet.
  • the trajectory is circular and centered on the point O, the point O being at the intersection between T'axe of the rotor and the perpendicularly cutting section of the X axis of the rotor.
  • the path extends along a maximum length of the recess.
  • the path extending along the maximum length of the recess is the length between two consecutive housings.
  • the recesses have a shape resulting from the combination of a triangle shape and a trapezoidal shape.
  • fourth sides of the triangle shape adjacent to two non-parallel first non-parallel sides of the trapezoidal shape define an angle (a) between 90 ° and 180 ° with respect to the first sides respectively adjacent thereto .
  • Such a range of angles offers a good compromise between the reduction of the magnetic leak paths, a saving of material and a good mechanical strength of the rotor.
  • a withdrawal portion extending along the axis (X) is arranged at the intersection of a radial face of the housing and an outer axial portion of the housing.
  • This withdrawal portion facilitates the incorporation of the magnet via a set of assembly.
  • this withdrawal portion can integrate a blade (or laminette) to improve the holding of the magnet in the housing.
  • the retaining device has a contact with the projecting portion all along the housing along the axis (X).
  • This contact makes it possible to standardize the transfer of forces from the protruding portion to the retaining device.
  • the projecting portion is between first edges separating said projecting portion from the two concave portions, said two concave portions being between these first edges and second edges that separate the concave portions of the radial faces of the housing.
  • the first facet in a section perpendicularly intersecting the axis (X) of the rotor, the first facet extends parallel to the holding device and the second and third parallels parallel to each other are connected to the concave portion at the location said first edges.
  • the housing has a closed contour in a section perpendicularly intersecting the axis of the rotor.
  • the recesses are formed in the body and positioned between the housings on a path successively connecting the protruding portions of the consecutive housings, along a cross section perpendicular to the axis of the rotor.
  • an alternator comprising a rotor according to a preceding embodiment is also aimed at.
  • Figure 1 shows a top view of an embodiment of a permanent magnet rotor according to the invention.
  • FIG. 2 shows a perspective view of the exemplary embodiment of the rotor shown in FIG.
  • Figure 3 shows a partial top view of the exemplary embodiment of the rotor shown in Figures 1 and 2.
  • FIG. 4 shows a view from above of the embodiment of the magnet rotor similar to FIG. 3 in which the distribution of the constraints of the rotor body in the operating state is represented, the distribution of the constraints being deduced from the movements of material represented by different reasons.
  • FIG. 5 shows a view similar to that of FIG. 4 in which an exemplary embodiment of a magnet rotor according to a prior art is represented.
  • FIG. 6 shows a perspective view of the exemplary embodiment shown in FIG. 1 in which the magnet and the device for holding the magnet are represented prior to their incorporation into the housing.
  • Figures 1, 2 show a rotor 1 according to the invention, X axis, having a body 3 fixed to a central hub (not shown) splined at its inner periphery for fixing in rotation on a shaft.
  • the body 3 comprises housings 9 intended to receive permanent magnets 14 held radially and axially by means of holding devices 17. More specifically, the rotor 1 is formed by a stack of sheets extending in a radial plane perpendicular to the X-axis. The bundle of sheets forms the body 3 of the rotor 1 and is made of ferromagnetic material.
  • the sheets of the body 3 are preferably held by means of rivets axially passing through the rotor 1 through openings 31.
  • Recesses 5 are formed in the body 3. According to a preferred embodiment, these recesses 5 have, in plan view (see FIG. 1), a shape resulting from the combination of a triangle shape and a trapeze. The triangle has a common side with the long side of the trapezoid. The recesses 5 make it possible to channel the magnetic flux.
  • the body 3 also comprises housings 9 - preferably of substantially parallelepiped shape - intended to receive permanent magnets 14. These housings 9 regularly spaced on the circumference of the rotor and located in the body 3 of the rotor 1, have a longitudinal direction of extension parallel to the axis X and an extension direction extending substantially radially relative to the axis X.
  • the housings 9, formed in the body 3, are here preferably and of generally rectangular section.
  • the housing 9, in a section perpendicular to the axis X, is through and adapted to allow the passage of the holding device 17; the section of this housing 9 is comparatively larger than the largest section of the holding device 17 perpendicular to the X axis, it being understood that during the mounting, the holding device 17 would be a male part and the passage would be the female part.
  • the housings 9 may be closed at one of their axial ends.
  • FIG. 6 shows a holding device 17, a central part 19 of which deforms a radial force on the magnet 14 and on an inner axial portion 91a of the housing 9.
  • the outer axial portion 91b and internal axial portion 91a the faces respectively oriented radially towards the axis X of the rotor 1 and the opposite side to the axis X of the rotor 1.
  • the inner axial portion 91 is facing outwardly of the rotor 1; the outside of the rotor 1 is the radial wall of the rotor 1 furthest from the axis X, the inside of the rotor 1 is the part of the rotor 1 which is relatively closer to the center of the rotor 1.
  • the housings 9 are intended to receive each of the elements in the form of a magnet 14 or a plurality of permanent magnets 14 superimposed on each other along one of their longitudinal face to obtain maximum power of the machine.
  • the superimposed magnets 14 thus form a column of magnetic elements having a shape complementary to that of the housings 9.
  • the magnets 14 can therefore be stacked one on the other in a radial direction to form a column of elements of complementary shape to that of housing 9.
  • the magnets 14 may be in rare earth for example based on Samarium-Cobalt (SmCo) or based on Neodymium-Iron-Boron (NdFeB) having a high coercivity and a high degree of remanence and a good temperature resistance. They can also be made of ferrite. Of course, the number of magnets depends on the applications and in particular on the length of the body 3.
  • the number may be equal to or less than the number of rare earth magnets. So we can use expensive rare earth magnets to get as close as possible to example of a desired electric power of the machine and complete this with less expensive ferrite magnets.
  • the invention makes it possible to use permanent magnets of different shade in order to optimize costs.
  • At least one of the magnets may be replaced by a non-magnetic element, for example made of aluminum, of the same shape to obtain the desired power of the electric machine. It is thus formed, in the axial direction, a column of elements stacked on each other and of complementary shape to that of the housing.
  • all the housings 9 may therefore contain a plurality of magnets 14 stacked in the radial direction with possibly presence of at least one non-magnetic element.
  • at least two diametrically opposed housings 9 are empty. Due to the fact that the column of elements comprises at least a plurality of stacked magnets, the power of the rotating electrical machine can be easily adjusted while keeping the same rotor.
  • the rotor 1 may comprise holding devices 17 formed from an elongate metal strip whose width depends on that of the housing 9 in which this strip enters.
  • the example of the holding device 17 shown in FIG. 6 comprises a central portion 19 extending axially inside the housing 9 between an axial portion 91 inside the housing 9 and an internal axial face 15 of a magnet. 14, this central portion 19 having a shape such that it deforms a radial force on the magnet 14 and on the inner axial portion 91 a.
  • This central portion 19 has a shape such that it deforms, when compressed between the magnets 14 and the inner axial portion 91a, a radial force on each magnet 14 of the housing 9 from the inside to the outside of the rotor 1.
  • the holding device 17 also comprise first and second retaining means 30 and 40. These first 30 and second 40 retaining means are carried by said central portion 19 to each of its ends. At the ends 20 of the central portion 19, the holding device extends to form the first and second retaining means. The ends 20 of the central portion 19 are located axially facing the axial ends of the inner axial portion 91a; these axial ends are defined axially at the separation between the inside and the outside of the housing 9.
  • the first 30 and second 40 retaining means have hook shapes with a bent portion.
  • the first and second retaining means 30 and 40 thus carried by said central portion 19 have shapes such that said retaining means 30 and 40 exert, by deformation, an axial force on lower and lower surfaces 4a and 4b respectively of the body 3 .
  • the holding device 17 is an elastic piece in the form of a strip of material, which has a central portion 19 and first and second elastically deformable retaining means 40 for exerting respectively a force radial and axial on the permanent magnets.
  • the central part 19 with radial action makes it possible to protect the magnets 14 because they are less sensitive to shocks and vibrations because of this central portion 19.
  • the first 30 and second 40 axially acting retaining means also make it possible to protect the 14 magnets and make these even less sensitive to shocks and vibrations.
  • the magnets 14 have good resistance to centrifugal force thanks to the holding device 17.
  • the central portion 19 and the first 30 and second 40 retaining means catch the play due to the manufacturing tolerances of the housings 9 and the magnets 14.
  • the presence of the magnets holding device 17 makes it possible to improve the radial resistance of the magnets without moving them, despite the manufacturing tolerances.
  • the holding device 17 may also include a second portion intended to be axially pressed between the magnet 14 and the bottom of the housing 9 (the housing 9 is then closed at one of its axial ends).
  • a holding flange may make it possible to ensure the axial closure of the open end of the housing 9 inside which the magnet 14 and its holding device 17 are positioned.
  • the holding device 17 has a contact with the projecting portion 41 all along the housing 9 along the axis X.
  • This holding flange then forms a bottom end of the housing
  • This flange is made of a non-magnetic material having high mechanical rigidity.
  • the flange may be aluminum.
  • the housing 9 is through and has two flanges of ends at each of the axial ends of the housing 9.
  • the at least one element in the form of a permanent magnet 14 is held radially and axially inside the housing 9 between the inner axial portion 91a of the housing 9 and the inner axial face 15 of the magnet 14. shown in Figures 1 to 4, the inner axial portion
  • the 91a of the housing 9 comprises two concave portions 42 and a portion protruding 41 extending axially along the axis X.
  • the projecting portion 41 is closer to the face 15 of the magnet than the two concave portions 42.
  • the recesses 5 are formed in the body 3 and positioned between the housings 9 on a path successively connecting the projecting portions 41 of the consecutive housings 9, preferably in a section perpendicularly intersecting the axis (X) of the rotor 1.
  • the recesses 5 are positioned between the housings 9 and formed in the body 3, at the same radial distance as the inner axial portion 91a of the housing 9. Is here understood by recess 5, a free passage of material even in operating state of the rotor 1.
  • a housing for incorporating a fixing means is not a recess within the meaning of the present application.
  • the trajectory is circular and has for center the point O, the point O being at the intersection between the axis X of the rotor 1 and said cross section perpendicularly the axis X of the rotor 1.
  • the trajectory extends along a maximum length L of the recess.
  • the maximum length L of the recess is taken to mean the length of the recess 5 extending substantially perpendicular to a radial direction D R originating from the point O and passing through the middle of this length L connecting two ends of the recess. recess 5.
  • the concave portions 42 have outer contours formed by lines 43 arcuate. These lines 43 in an arc of the outer contours of the concave portions 42 preferably have a center of common circle.
  • the center of the circle (here understood by the center of the lines 43 in an arc) is included in a plane passing through the axis (X) and is included radially in the housing 9; this plane passing through the axis (X) is included radially in the housing 9.
  • FIGS. 1 and 2 show a preferred embodiment in which the radius of curvature of the arcuate lines 43 is substantially half of a width I of the housing 9. In FIG. 3, which shows half of the housing 9 (FIG. cut according to its width I, see Figure 3), we see this provision more.
  • the recess 5 has a polygonal, circular, elliptical shape or a combination of the aforementioned forms. Conventionally, this recess 5 has a polygonal shape.
  • the recess 5 has two first sides 51, each of these first sides 51 extending substantially parallel to a radial face 91c of the nearest housing 9.
  • the first side 51 is radially at the same distance from the axis (X) of the rotor 1 as the inner axial portion 91a.
  • the concave portion 41 is at the same radial distance from the axis (X) as a portion of the first side 51 so that a thickness e is defined between the first side 51 of the recess 5 and the concave portion 42.
  • the concave portion 42 of the housing 9 then extends radially outwardly of the rotor 1 to form the radial face 91c of the housing 9.
  • This radial face 91c of the housing 9 may comprise a withdrawal portion 92 extending along the X axis, is arranged at the intersection of a radial face 91c of the housing 9 and the outer axial portion 91a of the housing 9.
  • this thickness e between the recess 5 and the housing 9 must be sufficiently thick to ensure good mechanical strength of the magnet 14, but it must be thin to prevent magnetic leakage paths.
  • the arrangement of the recess 5 for channeling the magnetic fluxes weakens the mechanical strength of the body 3 but a part of the stresses is advantageously transferred into the magnet 14 so that the forces are transferred radially overall from the inner axial portion 91 a to the outer axial portion 91b; in this way, the transfer of a portion of the forces to the projecting portion 41 and the magnet makes it possible to thin the thickness between the recess 5 and the housing 9 so as to minimize the leakage paths of the magnetic flux.
  • fourth sides 52 of the triangle shape adjacent to the non-parallel first sides 51 of the trapezoid shape define an angle (a) between 90 ° and 180 ° relative to the first sides 51 which are respectively adjacent to them.
  • the projecting portion 41 may preferably have a first facet 41 1 having a medium (M) defining the center of the lines 43 in an arc.
  • the radial face 91c of the housing 9 is substantially orthogonal to the first facet 41 1 of the projecting portion 41.
  • FIG. 6 shows an embodiment in which the projecting portion 41 is between first edges separating said projecting portion 41 from the two concave portions 42, said two concave portions 42 lying between these first edges and second edges which separating the concave portions 42 of the radial faces 91c of the housing 9.
  • the second edge is radially at the same distance from the axis X as a portion of the first side 51.
  • the first facet 41 1 extends parallel to the holding device 17 and the second and third parallel facets 412 of the projecting portion 41 parallel to each other. connect to the concave portion 42 at the location of said first edges.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)

Abstract

The invention concerns a rotor (1) with permanent magnets comprising: - a stack of laminations forming the core (3) of the rotor (1) having an axis (X), - housings (9) spaced evenly apart on the circumference of the rotor (1) and located in the core (3) of the rotor (1), some of which receive at least one element in the form of a permanent magnet (14) held radially and axially inside the housing (9) between an inner axial part (91a) of the housing and an outer axial part (91b), said inner axial part (91a) of the housing comprising two concave portions (42) and a protruding portion (41) extending axially according to the axis (X), said protruding portion (41) being radially closer to the inner axial face (15) of the magnet (14) than the two concave portions (42). Moreover, recesses (5) are provided in the core (3) and positioned between the housings (9) on a trajectory successively linking the protruding portions (41) of consecutive housings (9).

Description

« Rotor à aimants permanents »  "Permanent magnet rotor"
DESCRIPTION Domaine de l'invention Field of the invention
L'invention concerne un rotor pour machine électrique. The invention relates to a rotor for an electric machine.
L'invention trouve une application particulièrement avantageuse, mais non exclusive, avec les alternateurs ou générateurs de courant. The invention finds a particularly advantageous, but not exclusive, application with current generators or generators.
Etat de la technique State of the art
On connaît des machines électriques comportant un stator et un rotor à aimants permanents solidaire d'un arbre. Le rotor pourra être solidaire d'un arbre menant et/ou menée et pourra appartenir à une machine électrique tournante sous la forme d'un alternateur ou générateur de courant comme décrit dans le document EP 0 803 962 ou d'un moteur électrique comme décrit dans le document EP 0 831 580. L'arbre pourra assurer la mise en mouvement d'un compresseur à spirale, également connu sous le nom de « compresseur scroll ». Un tel système comporte deux spirales intercalées comme des palettes pour pomper et comprimer le fluide réfrigérant. En général, une des spires est fixe, alors que l'autre se déplace excentriquement sans tourner, de sorte à pomper puis emprisonner et enfin comprimer des poches de fluide entre les spires. Un tel système est par exemple décrit dans le document EP 1 865 200. Dans tous les cas, la machine comporte un boîtier portant le stator. Ce boîtier est configuré pour porter à rotation l'arbre par exemple par l'intermédiaire de roulement, tel que des roulements à billes et/ou à aiguilles. Electrical machines are known comprising a stator and a rotor with permanent magnets secured to a shaft. The rotor may be integral with a driving and / or driven shaft and may belong to a rotating electrical machine in the form of an alternator or current generator as described in document EP 0 803 962 or of an electric motor as described. in EP 0 831 580. The shaft can ensure the setting in motion of a scroll compressor, also known as "scroll compressor". Such a system comprises two spirals interposed as pallets for pumping and compressing the refrigerant. In general, one of the turns is fixed, while the other moves eccentrically without turning, so as to pump and then imprison and finally compress fluid pockets between the turns. Such a system is for example described in EP 1 865 200. In all cases, the machine comprises a housing carrying the stator. This housing is configured to rotate the shaft for example by means of rolling, such as ball bearings and / or needle.
Le rotor comprend un corps réalisé en tôle feuilletée, qui comporte des logements. A l'intérieur de certains des logements, est positionnée au moins un aimant permanent. Il existe des tolérances utilisées dans la réalisation du rotor qui font qu'il est possible que les aimants soient mal plaqués à l'intérieur des logements du rotor ; ce peut être gênant compte tenu de l'action de la force centrifuge à laquelle peuvent être soumis les aimants. Des solutions ont été développées pour remédier à cet aspect. The rotor comprises a body made of laminated sheet metal, which comprises housings. Inside some of the dwellings, is positioned at less a permanent magnet. There are tolerances used in the realization of the rotor which make it possible that the magnets are badly plated inside the housing of the rotor; this can be troublesome given the action of the centrifugal force to which the magnets can be subjected. Solutions have been developed to remedy this aspect.
Dans le document CN202221930, est décrit un rotor à aimants permanents comportant :  CN202221930 describes a permanent magnet rotor comprising:
- un paquet de tôles formant le corps du rotor ayant un axe, a bundle of sheets forming the rotor body having an axis,
- des logements espacés régulièrement sur la circonférence du rotor et situés dans le corps du rotor, dont certains reçoivent au moins un élément sous la forme d'un aimant permanent maintenu radialement et axialement à l'intérieur du logement entre une partie axiale intérieure du logement et une partie axiale extérieure, ladite partie axiale intérieure du logement comprenant deux portions concaves et une portion saillante s'étendant axialement suivant l'axe X, ladite portion saillante étant radialement à plus grande proximité d'une face axiale interne de l'aimant que les deux portions concaves. - Housing spaced regularly on the circumference of the rotor and located in the rotor body, some of which receive at least one element in the form of a permanent magnet held radially and axially inside the housing between an inner axial portion of the housing and an outer axial portion, said inner axial portion of the housing comprising two concave portions and a projecting portion extending axially along the X axis, said projecting portion being radially in greater proximity to an inner axial face of the magnet than the two concave portions.
Dans un tel rotor, il a été constaté qu'une partie du flux magnétique crée par le bobinage du rotor passait par des chemins de fuite au lieu d'être canalisé dans le corps du stator. Ces fuites de flux magnétiques ont lieu au voisinage des extrémités libres des aimants.  In such a rotor, it has been found that a part of the magnetic flux created by the rotor winding passed through leakage paths instead of being channeled into the stator body. These magnetic flux leaks occur in the vicinity of the free ends of the magnets.
Il a également été constaté qu'un tel rotor présente plusieurs inconvénients majeurs. En particulier, lors du montage de l'aimant dans son logement, il est indispensable de prévoir des tolérances géométriques réduites des rotor et du logement afin de maintenir radialement l'aimant ; plus précisément, les tolérances géométriques relatives au maintien axial de l'aimant telles que celles des crochets du logement et et de la portion saillante, sont particulièrement réduites. Ces tolérances géométriques impactent négativement les coûts de fabrication ; de mauvais ajustements pourraient ne pas permettre le bon plaquage radial de l'aimant, voire l'impossiblité de monter l'aimant au sein de son logement. It has also been found that such a rotor has several major disadvantages. In particular, when mounting the magnet in its housing, it is essential to provide reduced geometrical tolerances of the rotor and the housing in order to maintain the magnet radially; more precisely, the geometrical tolerances relating to the axial retention of the magnet such as those of the hooks of the housing and and of the projecting portion are particularly small. These geometric tolerances have a negative impact on manufacturing costs; bad adjustments may not allow the good radial plating of the magnet, or even the impossibility of mounting the magnet within its housing.
Objet de l'invention Object of the invention
Dans ce contexte, le problème ici posé est de réduire les chemins de fuite de flux magnétique du rotor sans impacter négativement la tenue mécanique du rotor. En particulier, un des objectifs ici visés est d'éviter que des concentrations de contrainte mécanique pouvant avoir lieu à proximité du logement de l'aimant n'affecte négativement la durée de vie du rotor du fait de son fonctionnement. En particulier, il s'agit de proposer un rotor à aimants permanents, facile à réaliser, peu coûteux, durable et présentant un compromis entre la prévention des chemins de fuite de flux magnétique et la tenue mécanique du corps du rotor. In this context, the problem posed here is to reduce the magnetic flux leakage paths of the rotor without negatively impacting the mechanical strength of the rotor. In particular, one of the objectives here is to avoid that mechanical stress concentrations that can occur in the vicinity of the housing of the magnet does not adversely affect the life of the rotor because of its operation. In particular, it is a question of proposing a rotor with permanent magnets, easy to produce, inexpensive, durable and presenting a compromise between the prevention of magnetic flux leakage paths and the mechanical strength of the rotor body.
La solution proposée par la présente invention est que des évidements sont ménagés dans le corps et positionnées entre les logements sur une trajectoire reliant successivement les portions saillantes des logements consécutifs.  The solution proposed by the present invention is that recesses are formed in the body and positioned between the housing on a path successively connecting the protruding portions of the consecutive housing.
Un tel agencement permet de réduire les chemins de fuite de flux magnétique. En effet, avec des évidements sur le trajectoire reliant deux portions saillantes, l'épaisseur du corps entre l'évidement et le logement est réduite. Cette faible épaisseur par exemple 1 mm forme un goulot d'étranglement des fuites magnétiques. Cet agencement permet également une tenue mécanique suffisante.  Such an arrangement makes it possible to reduce the magnetic flux leakage paths. Indeed, with recesses on the path connecting two projecting portions, the thickness of the body between the recess and the housing is reduced. This small thickness for example 1 mm forms a bottleneck magnetic leaks. This arrangement also allows sufficient mechanical strength.
Dans un mode de réalisation, l'aimant est maintenu radialement et axialement au moyen d'un dispositif de maintien s'étendant axialement à l'intérieur du logement entre la partie axiale intérieure du logement et ladite face axiale de l'aimant. Ce dispositif de maintien présente avantageusement un effet ressort pour maintenir les aimants lorsqu'il est placé dans un des logements 9. Un tel agencement empêche le glissement intempestif de l'aimant par rapport à son logement, lors du fonctionnement du rotor à haute vitesse de rotation. En effet, l'effet ressort du dispositif de maintien permet d'objecter une force opposée à la force centrifuge. In one embodiment, the magnet is held radially and axially by means of a holding device extending axially inside the housing between the inner axial portion of the housing and said axial face of the magnet. This holding device advantageously has a spring effect for holding the magnets when it is placed in one of the housings 9. Such an arrangement prevents unwanted sliding of the magnet relative to its housing during operation of the rotor at high rotational speed. Indeed, the spring effect of the holding device makes it possible to object to a force opposing the centrifugal force.
Dans un mode de réalisation, les portions concaves présentent des contours extérieurs formés par des lignes en arc de cercle.  In one embodiment, the concave portions have outer contours formed by lines in an arc.
Les lignes en arc de cercle des contours extérieurs des portions concaves permettent d'affiner progressivement l'épaisseur de matière entre le logement et l'évidement et améliorent la résistance mécanique du corps du rotor, en particulier au voisinage du logement et de l'évidement The arcuate lines of the outer contours of the concave portions make it possible to progressively refine the thickness of material between the housing and the recess and improve the mechanical strength of the rotor body, in particular in the vicinity of the housing and the recess.
Il a été constaté que plus l'épaisseur entre le logement et l'évidement est faible, moins il y a de chemins de fuite de flux magnétique, et moins le corps du rotor a une bonne tenue mécanique. It has been found that the lower the thickness between the housing and the recess, the fewer magnetic flux leakage paths, and the less the rotor body has good mechanical strength.
Ainsi, l'agencement combinant la portion saillante radialement à plus grande proximité de la face axiale de l'aimant que les deux portions concaves et affinement progressif de l'épaisseur de matière entre le logement et l'évidement via des lignes en arc de cercle permet de répondre à ces deux problèmes et proposent un bon compromis.  Thus, the arrangement combining the radially projecting portion at greater proximity to the axial face of the magnet than the two concave portions and progressive refinement of the material thickness between the housing and the recess via arcuate lines. allows to answer these two problems and propose a good compromise.
Dans un mode de réalisation, la portion saillante présente une première facette présentant un milieu (M) définissant le centre des lignes en arc de cercle.  In one embodiment, the projecting portion has a first facet having a medium (M) defining the center of the lines in an arc.
Dans un mode de réalisation, les lignes en arc de cercle des contours extérieurs des portions concaves ont un centre de cercle commun.  In one embodiment, the arcuate lines of the outer contours of the concave portions have a common circle center.
Cela permet de faciliter la fabrication du rotor et d'assurer une répartition homogène des flux magnétiques parcourant le rotor.  This facilitates the manufacture of the rotor and ensure a homogeneous distribution of the magnetic flux flowing through the rotor.
Dans un mode de réalisation, le centre du cercle est compris dans un plan passant par l'axe (X) et est compris radialement dans le logement.  In one embodiment, the center of the circle is included in a plane passing through the axis (X) and is included radially in the housing.
Dans un mode de réalisation, le rayon de courbure des lignes en arc de cercle est sensiblement égal à la moitié d'une largeur du logement.  In one embodiment, the radius of curvature of the arcuate lines is substantially equal to half a width of the housing.
Cette caractérisitque améliore la symétrie du logement et ainsi l'équilibrage du rotor. Dans un mode de réalisation, l'évidement présente deux premiers côtés, chacun de ces premiers côtés s'étendant sensiblement parallèlement à une face radiale du logement le plus proche. This feature improves the symmetry of the housing and thus the balancing of the rotor. In one embodiment, the recess has two first sides, each of said first sides extending substantially parallel to a radial face of the nearest housing.
Cela permet de rigidifier la structure du rotor en évitant des concentrations de contraintes aux endroits où la matière comprise entre la face radiale du logement et les premiers côtés du logement définisse un amincissement. Cela permet avantageusement de répartir les contraintes de manière homogène.  This makes it possible to stiffen the rotor structure by avoiding stress concentrations where the material between the radial face of the housing and the first sides of the housing defines a thinning. This advantageously makes it possible to distribute the stresses in a homogeneous manner.
Dans un mode de réalisation, l'épaisseur comprise entre la face radiale d'un logement et le côté d'un évidement suivant est amincie pour limiter les chemins de fuite magnétique.  In one embodiment, the thickness between the radial face of a housing and the side of a subsequent recess is thinned to limit the magnetic leakage paths.
Dans un mode de réalisation, la face radiale de l'aimant est sensiblement orthogonale à la première facette de la portion en saillie.  In one embodiment, the radial face of the magnet is substantially orthogonal to the first facet of the protruding portion.
L'aimant étant guidé radialement par les faces radiales du logement, cela permet avantageusement de transférer les efforts depuis la portion en saillie vers l'aimant via la première facette ; une plus grande partie des contraintes est transférée radialement dans l'aimant, ce qui réduit les contraintes entre l'évidement et le logement de l'aimant.  The magnet being guided radially by the radial faces of the housing, this advantageously makes it possible to transfer the forces from the protruding portion to the magnet via the first facet; a greater proportion of the stresses is transferred radially into the magnet, which reduces the stresses between the recess and the housing of the magnet.
Dans un mode de réalisation, la trajectoire est circulaire et a pour centre le point O, le point O étant à l'intersection entre T'axe du rotor et la section coupant perpendiculairement l'axe X du rotor.  In one embodiment, the trajectory is circular and centered on the point O, the point O being at the intersection between T'axe of the rotor and the perpendicularly cutting section of the X axis of the rotor.
Dans un mode de réalisation, la trajectoire s'étend suivant une longueur maximale de l'évidement. En particulier, la trajectoire s'étendant suivant la longueur maximale de l'évidement, est la longueur comprise entre deux logements consécutifs.  In one embodiment, the path extends along a maximum length of the recess. In particular, the path extending along the maximum length of the recess, is the length between two consecutive housings.
Dans un mode de réalisation, les évidements présentent une forme issue de la combinaison d'une forme en triangle et d'une forme en trapèze.  In one embodiment, the recesses have a shape resulting from the combination of a triangle shape and a trapezoidal shape.
Une telle forme offre un bon compromis entre la réduction des chemins de fuite magnétique, une économie de matière et une bonne tenue mécanique du rotor. Dans un mode de réalisation, des quatrièmes côtés de la forme de triangle adjacents à deux premiers côtés non parallèles de la forme de trapèze, définissent un angle (a) compris entre 90° et 180° par rapport aux premiers côtés qui leur sont respectivement adjacents. Such a shape offers a good compromise between the reduction of the magnetic leak paths, a saving of material and a good mechanical strength of the rotor. In one embodiment, fourth sides of the triangle shape adjacent to two non-parallel first non-parallel sides of the trapezoidal shape, define an angle (a) between 90 ° and 180 ° with respect to the first sides respectively adjacent thereto .
Une telle plage de valeur d'angles offre un bon compromis entre la réduction des chemins de fuite magnétique, une économie de matière et une bonne tenue mécanique du rotor.  Such a range of angles offers a good compromise between the reduction of the magnetic leak paths, a saving of material and a good mechanical strength of the rotor.
Dans un mode de réalisation, une portion de retrait s'étendant suivant l'axe (X), est agencée à l'intersection d'une face radiale du logement et d'une partie axiale extérieure du logement.  In one embodiment, a withdrawal portion extending along the axis (X) is arranged at the intersection of a radial face of the housing and an outer axial portion of the housing.
Cette portion de retrait permet de faciliter l'incorporation de l'aimant via un jeu d'assemblage. Dans un cas où l'aimant est fixé dans le logement au moyen d'une colle, cela permet une fuite de colle vers cette portion de retrait. Dans un autre cas, cette portion de retrait peut permettre d'intégrer une lame (ou laminette) pour améliorer la tenue de l'aimant dans le logement.  This withdrawal portion facilitates the incorporation of the magnet via a set of assembly. In a case where the magnet is fixed in the housing by means of an adhesive, this allows leakage of glue towards this withdrawal portion. In another case, this withdrawal portion can integrate a blade (or laminette) to improve the holding of the magnet in the housing.
Dans un mode de réalisation, le dispositif de retenue présente un contact avec la portion saillante tout le long du logement, suivant l'axe (X).  In one embodiment, the retaining device has a contact with the projecting portion all along the housing along the axis (X).
Ce contact permet d'uniformiser la transfert des efforts depuis la portion saillante vers le dispositif de retenue.  This contact makes it possible to standardize the transfer of forces from the protruding portion to the retaining device.
Dans un mode de réalisation, la portion saillante est comprise entre des premières arêtes séparant ladite portion saillante des deux portions concaves, lesdites deux portions concaves étant comprises entre ces premières arêtes et des deuxièmes arêtes qui séparent les portions concaves des faces radiales du logement.  In one embodiment, the projecting portion is between first edges separating said projecting portion from the two concave portions, said two concave portions being between these first edges and second edges that separate the concave portions of the radial faces of the housing.
Dans un mode de réalisation, suivant une section coupant perpendiculairement l'axe (X) du rotor, la première facette s'étend parallèlement au dispositif de maintien et des deuxième et troisième facettes parallèles entre elles se raccordent à la portion concave à l'endroit desdites premières arêtes. Dans un mode de réalisation, le logement présente un contour fermé suivant une section coupant perpendiculairement l'axe du rotor. In one embodiment, in a section perpendicularly intersecting the axis (X) of the rotor, the first facet extends parallel to the holding device and the second and third parallels parallel to each other are connected to the concave portion at the location said first edges. In one embodiment, the housing has a closed contour in a section perpendicularly intersecting the axis of the rotor.
Dans un mode de réalisation, les évidements sont ménagés dans le corps et positionnées entre les logements sur une trajectoire reliant successivement les portions saillantes des logements consécutifs, suivant une section coupant perpendiculairement l'axe du rotor.  In one embodiment, the recesses are formed in the body and positioned between the housings on a path successively connecting the protruding portions of the consecutive housings, along a cross section perpendicular to the axis of the rotor.
Suivant un deuxième objet de l'invention, est également visé un alternateur comprenant un rotor selon un mode de réalisation qui précède. Brève description des figures  According to a second object of the invention, an alternator comprising a rotor according to a preceding embodiment is also aimed at. Brief description of the figures
La figure 1 montre une vue de dessus d'un exemple de réalisation d'un rotor à aimants permanents selon l'invention. Figure 1 shows a top view of an embodiment of a permanent magnet rotor according to the invention.
La figure 2 montre une vue en perspective de l'exemple de réalisation du rotor représenté sur la figure 1 .  FIG. 2 shows a perspective view of the exemplary embodiment of the rotor shown in FIG.
La figure 3 montre une vue de dessus partielle de l'exemple de réalisation du rotor montré sur les figures 1 et 2.  Figure 3 shows a partial top view of the exemplary embodiment of the rotor shown in Figures 1 and 2.
La figure 4 montre une vue de dessus de l'exemple de réalisation du rotor à aimants similaire à la figure 3 dans lequel la répartition des contraintes du corps de rotor en état de fonctionnement est représenté, la répartition des contraintes se déduisant des déplacements de matière représentés par différents motifs.  FIG. 4 shows a view from above of the embodiment of the magnet rotor similar to FIG. 3 in which the distribution of the constraints of the rotor body in the operating state is represented, the distribution of the constraints being deduced from the movements of material represented by different reasons.
La figure 5 montre une vue analogue à celle de la figure 4 dans lequel un exemple de réalisation d'un rotor à aimants selon un art antérieur est représenté.  FIG. 5 shows a view similar to that of FIG. 4 in which an exemplary embodiment of a magnet rotor according to a prior art is represented.
La figure 6 montre une vue en perspective de l'exemple de réalisation montré sur la figure 1 dans laquelle l'aimant et le dispositif de maintien de l'aimant sont représentés préalablement à leur incorporation dans le logement.  FIG. 6 shows a perspective view of the exemplary embodiment shown in FIG. 1 in which the magnet and the device for holding the magnet are represented prior to their incorporation into the housing.
Les éléments identiques, similaires ou analogues conservent la même référence d'une figure à l'autre. Description d'exemples de réalisation de l'invention Identical, similar or similar elements retain the same reference from one figure to another. Description of embodiments of the invention
Les figures 1 , 2 montrent un rotor 1 selon l'invention, d'axe X, ayant un corps 3 fixé à un moyeu central (non représenté) cannelé à sa périphérie interne pour fixation en rotation sur un arbre. Le corps 3 comporte des logements 9 destinés à recevoir des aimants permanents 14 maintenus radialement et axialement à l'aide de dispositifs de maintien 17. Plus précisément, le rotor 1 est formé par un empilement de tôles s'étendant dans un plan radial perpendiculaire à l'axe X. Le paquet de tôles forme le corps 3 du rotor 1 et est en matière ferromagnétique. Les tôles du corps 3 sont préférentiellement maintenues au moyen de rivets traversant axialement le rotor 1 de part en part via des ouvertures 31 . Figures 1, 2 show a rotor 1 according to the invention, X axis, having a body 3 fixed to a central hub (not shown) splined at its inner periphery for fixing in rotation on a shaft. The body 3 comprises housings 9 intended to receive permanent magnets 14 held radially and axially by means of holding devices 17. More specifically, the rotor 1 is formed by a stack of sheets extending in a radial plane perpendicular to the X-axis. The bundle of sheets forms the body 3 of the rotor 1 and is made of ferromagnetic material. The sheets of the body 3 are preferably held by means of rivets axially passing through the rotor 1 through openings 31.
Des évidements 5 sont ménagés dans le corps 3. Selon un mode de réalisation préféré, ces évidements 5 présentent, en vue de dessus (voir figure 1 ), une forme issue de la combinaison d'une forme en triangle et d'une forme en trapèze. Le triangle présente un côté commun avec le grand côté du trapèze. Les évidements 5 permettent de bien canaliser le flux magnétique.  Recesses 5 are formed in the body 3. According to a preferred embodiment, these recesses 5 have, in plan view (see FIG. 1), a shape resulting from the combination of a triangle shape and a trapeze. The triangle has a common side with the long side of the trapezoid. The recesses 5 make it possible to channel the magnetic flux.
Le corps 3 comporte également des logements 9 - préférentiellement de forme sensiblement parallélépipédique - destinés à recevoir des aimants permanents 14. Ces logements 9 espacés régulièrement sur la circonférence du rotor et situés dans le corps 3 du rotor 1 , présentent une direction longitudinale d'extension parallèle à l'axe X et une direction d'extension s'étendant sensiblement radialement par rapport à l'axe X. Les logements 9, formés dans le corps 3, sont ici préférentiellement et de section globalement rectangulaire. Alternativement, le logement 9, suivant une section perpendiculaire à l'axe X, est traversant et propre à permettre le passage du dispositif de maintien 17 ; la section de ce logement 9 est comparativement plus grande que la plus grande des sections du dispositif de maintien 17 perpendiculaire à l'axe X, étant entendu que lors du montage, le dispositif de maintien 17 constituerait une partie mâle et le passage constituerait la partie femelle. Alternativement, les logements 9 peuvent être fermés l'une de leurs extrémités axiales. The body 3 also comprises housings 9 - preferably of substantially parallelepiped shape - intended to receive permanent magnets 14. These housings 9 regularly spaced on the circumference of the rotor and located in the body 3 of the rotor 1, have a longitudinal direction of extension parallel to the axis X and an extension direction extending substantially radially relative to the axis X. The housings 9, formed in the body 3, are here preferably and of generally rectangular section. Alternatively, the housing 9, in a section perpendicular to the axis X, is through and adapted to allow the passage of the holding device 17; the section of this housing 9 is comparatively larger than the largest section of the holding device 17 perpendicular to the X axis, it being understood that during the mounting, the holding device 17 would be a male part and the passage would be the female part. Alternatively, the housings 9 may be closed at one of their axial ends.
Sur la figure 6, est représenté un dispositif de maintien 17 dont une partie centrale 19 exerce par déformation un effort radial sur l'aimant 14 ainsi que sur une partie axiale interérieure 91 a du logement 9. Sont entendues par partie axiale extérieure 91 b et partie axiale interne 91 a, les faces respectivement orientées radialement vers l'axe X du rotor 1 et côté opposé à l'axe X du rotor 1 . Autrement dit, la partie axiale 91 a interne est tournée vers l'extérieur du rotor 1 ; l'extérieur du rotor 1 est la paroi radiale du rotor 1 la plus éloignée de l'axe X, l'intérieur du rotor 1 est la partie du rotor 1 qui est relativement à plus grande proximité du centre du rotor 1 .  FIG. 6 shows a holding device 17, a central part 19 of which deforms a radial force on the magnet 14 and on an inner axial portion 91a of the housing 9. Are understood by the outer axial portion 91b and internal axial portion 91a, the faces respectively oriented radially towards the axis X of the rotor 1 and the opposite side to the axis X of the rotor 1. In other words, the inner axial portion 91 is facing outwardly of the rotor 1; the outside of the rotor 1 is the radial wall of the rotor 1 furthest from the axis X, the inside of the rotor 1 is the part of the rotor 1 which is relatively closer to the center of the rotor 1.
Les logements 9 sont destinés à recevoir chacun des éléments sous la forme d'un aimant 14 ou d'une pluralité d'aimants permanents 14 superposés les uns sur les autres suivant une de leur face longitudinale pour obtenir une puissance maximale de la machine. Les aimants 14 ainsi superposés forment alors une colonne d'éléments magnétiques ayant une forme complémentaire de celle des logements 9. Les aimants 14 peuvent donc être empilés les uns sur les autres suivant une direction radiale pour former une colonne d'éléments de forme complémentaire à celle des logements 9.  The housings 9 are intended to receive each of the elements in the form of a magnet 14 or a plurality of permanent magnets 14 superimposed on each other along one of their longitudinal face to obtain maximum power of the machine. The superimposed magnets 14 thus form a column of magnetic elements having a shape complementary to that of the housings 9. The magnets 14 can therefore be stacked one on the other in a radial direction to form a column of elements of complementary shape to that of housing 9.
Les aimants 14 peuvent être en terre rare par exemple à base de Samarium-Cobalt (SmCo) ou à base de Néodymium- Fer- Bore (NdFeB) ayant une haute coercivité et un taux élevé de rémanence ainsi qu'une bonne tenue en température. Ils peuvent également être en ferrite. Bien entendu le nombre d'aimants dépend des applications et notamment de la longueur du corps 3.  The magnets 14 may be in rare earth for example based on Samarium-Cobalt (SmCo) or based on Neodymium-Iron-Boron (NdFeB) having a high coercivity and a high degree of remanence and a good temperature resistance. They can also be made of ferrite. Of course, the number of magnets depends on the applications and in particular on the length of the body 3.
En variante on peut loger dans des logements 9 des aimants 14 en terre rare et dans d'autres logements 9 des ferrites, dont le nombre pourra être égal ou inférieur au nombre d'aimants en terre rare. Ainsi on peut utiliser des aimants en terre rare coûteux pour s'approcher au mieux par exemple d'une puissance électrique souhaitée de la machine et compléter cela par des aimants en ferrite moins coûteux. L'invention permet de faire appel à des aimants permanents de nuance différente afin d'optimiser les coûts. Alternatively can be housed in the housing 9 magnets 14 rare earth and other housing 9 ferrites, the number may be equal to or less than the number of rare earth magnets. So we can use expensive rare earth magnets to get as close as possible to example of a desired electric power of the machine and complete this with less expensive ferrite magnets. The invention makes it possible to use permanent magnets of different shade in order to optimize costs.
En outre dans certains des logements 9 on peut remplacer au moins l'un des aimants par un élément amagnétique, par exemple en Aluminium, de même forme pour obtenir la puissance désirée de la machine électrique. Il est ainsi formé, dans la direction axiale, une colonne d'éléments empilés les uns sur les autres et de forme complémentaire à celle des logements.  In addition, in some of the housings 9, at least one of the magnets may be replaced by a non-magnetic element, for example made of aluminum, of the same shape to obtain the desired power of the electric machine. It is thus formed, in the axial direction, a column of elements stacked on each other and of complementary shape to that of the housing.
Ainsi tous les logements 9 peuvent donc contenir une pluralité d'aimants 14 empilés selon la direction radiale avec éventuellement présence d'au moins un élément amagnétique. En variante, au moins deux logements 9 diamétralement opposés sont vides. Grâce au fait que la colonne d'éléments comporte au moins une pluralité d'aimants empilés on peut régler aisément la puissance de la machine électrique tournante tout en conservant le même rotor.  Thus all the housings 9 may therefore contain a plurality of magnets 14 stacked in the radial direction with possibly presence of at least one non-magnetic element. In a variant, at least two diametrically opposed housings 9 are empty. Due to the fact that the column of elements comprises at least a plurality of stacked magnets, the power of the rotating electrical machine can be easily adjusted while keeping the same rotor.
Pour assurer un bon maintien des aimants 14 à l'intérieur de leur logement 9, le rotor 1 peut comporter des dispositifs de maintien 17 formés à partir d'une bande de métal allongée, dont la largeur dépend de celle du logement 9 dans lequel cette bande pénètre.  To ensure a good retention of the magnets 14 inside their housing 9, the rotor 1 may comprise holding devices 17 formed from an elongate metal strip whose width depends on that of the housing 9 in which this strip enters.
Ainsi l'exemple de dispositif de maintien 17 montré sur la figure 6 comprend une partie centrale 19 s'étendant axialement à l'intérieur du logement 9 entre une partie axiale 91 a intérieure du logement 9 et une face 15 axiale interne d'un aimant 14, cette partie centrale 19 ayant une forme telle qu'elle exerce par déformation un effort radial sur l'aimant 14 et sur la partie axiale intérieure 91 a. Cette partie centrale 19 présente une forme telle qu'elle exerce par déformation, lorsqu'elle est compressée entre les aimants 14 et la partie axiale intérieure 91 a, un effort radial sur chaque aimant 14 du logement 9 de l'intérieur vers l'extérieur du rotor 1 . Du fait de l'élasticité du dispositif de maintien 17, on peut assimiler celui-ci à un ressort, plus particulièrement un ressort à lame comprenant une première position de détente et une seconde position de compression. Dans le cas présent, lorsque le dispositif de maintien 17 et l'aimant sont montés dans le rotor 2, le ressort est dans sa seconde position de compression. Thus, the example of the holding device 17 shown in FIG. 6 comprises a central portion 19 extending axially inside the housing 9 between an axial portion 91 inside the housing 9 and an internal axial face 15 of a magnet. 14, this central portion 19 having a shape such that it deforms a radial force on the magnet 14 and on the inner axial portion 91 a. This central portion 19 has a shape such that it deforms, when compressed between the magnets 14 and the inner axial portion 91a, a radial force on each magnet 14 of the housing 9 from the inside to the outside of the rotor 1. Due to the elasticity of the holding device 17, it can be likened to a spring, more particularly a leaf spring comprising a first detent position and a second compression position. In this case, when the holding device 17 and the magnet are mounted in the rotor 2, the spring is in its second compression position.
Selon l'exemple de réalisation montré sur la figure 6, le dispositif de maintien 17 comportent également des premier et second moyens de retenue 30 et 40. Ces premier 30 et second 40 moyens de retenue sont portés par ladite partie centrale 19 à chacune de ses extrémités. A l'endroit des extrémités 20 de la partie centrale 19, le dispositif de maintien s'étend pour former les premier et second moyens de retenue. Les extrémités 20 de la partie centrale 19 sont situées axialement en regard des extrémités axiales de la partie axiale intérieure 91 a ; ces extrémités axiales sont définies axialement à la séparation entre l'intérieur et l'extérieur du logement 9. Comme montré sur la figure 6, les premier 30 et second 40 moyens de retenue présentent des formes de crochet avec une partie recourbée. Classiquement, les premier et second moyens de retenue 30 et 40 ainsi portés par ladite partie centrale 19 présentent des formes telles que lesdits moyens de retenue 30 et 40 exercent par déformation, un effort axial sur des faces respectivement inférieure 4a et supérieure 4b du corps 3.  According to the embodiment shown in Figure 6, the holding device 17 also comprise first and second retaining means 30 and 40. These first 30 and second 40 retaining means are carried by said central portion 19 to each of its ends. At the ends 20 of the central portion 19, the holding device extends to form the first and second retaining means. The ends 20 of the central portion 19 are located axially facing the axial ends of the inner axial portion 91a; these axial ends are defined axially at the separation between the inside and the outside of the housing 9. As shown in Figure 6, the first 30 and second 40 retaining means have hook shapes with a bent portion. Conventionally, the first and second retaining means 30 and 40 thus carried by said central portion 19 have shapes such that said retaining means 30 and 40 exert, by deformation, an axial force on lower and lower surfaces 4a and 4b respectively of the body 3 .
Ainsi qu'il ressort de la description et des dessins le dispositif de maintien 17 est une pièce élastique en forme de bande de matière, qui présente une partie centrale 19 et des premier 30 et second 40 moyens de retenue élastiquement déformables pour exercer respectivement un effort radial et axial sur les aimants permanents. La partie centrale 19 à action radiale permet de ménager les aimants 14 car ceux-ci sont moins sensibles aux chocs et aux vibrations du fait de cette partie centrale 19. Les premier 30 et second 40 moyens de retenue à action axiale permet également de ménager les aimants 14 et de rendre ceux-ci encore moins sensibles aux chocs et aux vibrations. Les aimants 14 ont une bonne tenue à la force centrifuge grâce au dispositif de maintien 17. La partie centrale 19 et les premier 30 et second 40 moyens de retenue rattrapent les jeux dûs aux tolérances de fabrication des logements 9 et des aimants 14. As can be seen from the description and the drawings, the holding device 17 is an elastic piece in the form of a strip of material, which has a central portion 19 and first and second elastically deformable retaining means 40 for exerting respectively a force radial and axial on the permanent magnets. The central part 19 with radial action makes it possible to protect the magnets 14 because they are less sensitive to shocks and vibrations because of this central portion 19. The first 30 and second 40 axially acting retaining means also make it possible to protect the 14 magnets and make these even less sensitive to shocks and vibrations. The magnets 14 have good resistance to centrifugal force thanks to the holding device 17. The central portion 19 and the first 30 and second 40 retaining means catch the play due to the manufacturing tolerances of the housings 9 and the magnets 14.
On appréciera que la présence du dispositif de maintien 17 des aimants permet d'améliorer la tenue radiale des aimants sans mouvement de ceux-ci, malgré les tolérances de fabrication.  It will be appreciated that the presence of the magnets holding device 17 makes it possible to improve the radial resistance of the magnets without moving them, despite the manufacturing tolerances.
Bien entendu, l'homme du métier pourra apporter des modifications aux différentes formes du corps 3 du rotor 1 et des dispositifs de maintien 17 décrites dans les figures sans sortir du cadre de l'invention.  Of course, those skilled in the art can make modifications to the various shapes of the body 3 of the rotor 1 and the holding devices 17 described in the figures without departing from the scope of the invention.
Alternativement, le dispositif de maintien 17 peut également comporter une deuxième partie destinée à être plaquée axialement entre l'aimant 14 et le fond du logement 9 (le logement 9 étant alors fermé à une de ses extrémités axiales). Un flasque de maintien peut permettre d'assurer la fermeture axiale de l'extrémité ouverte du logement 9 à l'intérieur duquel sont positionnés l'aimant 14 et son dispositif de maintien 17.  Alternatively, the holding device 17 may also include a second portion intended to be axially pressed between the magnet 14 and the bottom of the housing 9 (the housing 9 is then closed at one of its axial ends). A holding flange may make it possible to ensure the axial closure of the open end of the housing 9 inside which the magnet 14 and its holding device 17 are positioned.
Suivant un mode de réalisation de l'invention, le dispositif de maintien 17 présente un contact avec la portion saillante 41 tout le long du logement 9, suivant l'axe X.  According to one embodiment of the invention, the holding device 17 has a contact with the projecting portion 41 all along the housing 9 along the axis X.
Cette flasque de maintien forme alors un fond d'extrémité du logement This holding flange then forms a bottom end of the housing
9. Elle assure un équilibrage du rotor 1 tout en permettant un bon maintien de l'aimant 14 à l'intérieur de son logement 9. Cette flasque est réalisé en un matériau non magnétique présentant une grande rigidité mécanique. La flasque pourra être en aluminium. Alternativement, le logement 9 est traversant et présente deux flasques d'extrémités à chacune des extrémités axiales du logement 9. 9. It balances the rotor 1 while allowing a good retention of the magnet 14 inside its housing 9. This flange is made of a non-magnetic material having high mechanical rigidity. The flange may be aluminum. Alternatively, the housing 9 is through and has two flanges of ends at each of the axial ends of the housing 9.
L'au moins un élément sous la forme d'un aimant 14 permanent est maintenu radialement et axialement à l'intérieur du logement 9 entre la partie axiale intérieure 91 a du logement 9 et la face 15 axiale interne de l'aimant 14. Comme montré sur les figures 1 à 4, la partie axiale intérieure The at least one element in the form of a permanent magnet 14 is held radially and axially inside the housing 9 between the inner axial portion 91a of the housing 9 and the inner axial face 15 of the magnet 14. shown in Figures 1 to 4, the inner axial portion
91 a du logement 9 comprend deux portions concaves 42 et une portion saillante 41 s'étendant axialement suivant l'axe X. La portion saillante 41 est à plus grande proximité de la face 15 de l'aimant que les deux portions concaves 42. 91a of the housing 9 comprises two concave portions 42 and a portion protruding 41 extending axially along the axis X. The projecting portion 41 is closer to the face 15 of the magnet than the two concave portions 42.
Selon l'invention, les évidements 5 sont ménagés dans le corps 3 et positionnées entre les logements 9 sur une trajectoire reliant successivement les portions saillantes 41 des logements 9 consécutifs, préférentiellement suivant une section coupant perpendiculairement l'axe (X) du rotor 1 . Les évidements 5 sont positionnés entre les logements 9 et ménagés dans le corps 3, suivant une même distance radiale que la partie axiale intérieure 91 a du logement 9. Est ici entendu par évidement 5, un passage libre de matière même en état de fonctionnement du rotor 1 . A ce titre, un logement pour y intégrer un moyen de fixation n'est pas un évidement au sens de la présente demande.  According to the invention, the recesses 5 are formed in the body 3 and positioned between the housings 9 on a path successively connecting the projecting portions 41 of the consecutive housings 9, preferably in a section perpendicularly intersecting the axis (X) of the rotor 1. The recesses 5 are positioned between the housings 9 and formed in the body 3, at the same radial distance as the inner axial portion 91a of the housing 9. Is here understood by recess 5, a free passage of material even in operating state of the rotor 1. As such, a housing for incorporating a fixing means is not a recess within the meaning of the present application.
Dans un mode de rélisation, la trajectoire est circulaire et a pour centre le point O, le point O étant à l'intersection entre l'axe X du rotor 1 et ladite section coupant perpendiculairement l'axe X du rotor 1 .  In a mode of realization, the trajectory is circular and has for center the point O, the point O being at the intersection between the axis X of the rotor 1 and said cross section perpendicularly the axis X of the rotor 1.
Dans un autre mode de réalisation de l'invention, la trajectoire s'étend suivant une longueur L maximale de l'évidement. Est ici entendu par longeur L maximale de l'évidement, la longueur de l'évidement 5 s'étendant sensiblement perpendiculairement à une direction radiale DR ayant pour origine le point O et passant par le milieu de cette longueur L reliant deux extrémités de l'évidement 5. In another embodiment of the invention, the trajectory extends along a maximum length L of the recess. Here, the maximum length L of the recess is taken to mean the length of the recess 5 extending substantially perpendicular to a radial direction D R originating from the point O and passing through the middle of this length L connecting two ends of the recess. recess 5.
Selon un mode de réalisation, les portions concaves 42 présentent des contours extérieurs formés par des lignes 43 en arc de cercle. Ces lignes 43 en arc de cercle des contours extérieurs des portions concaves 42 ont préférentiellement un centre de cercle commun.  According to one embodiment, the concave portions 42 have outer contours formed by lines 43 arcuate. These lines 43 in an arc of the outer contours of the concave portions 42 preferably have a center of common circle.
Selon une variante, le centre du cercle (ici entendu par le centre des lignes 43 en arc de cercle) est compris dans un plan passant par l'axe (X) et est compris radialement dans le logement 9 ; ce plan passant par l'axe (X) est compris radialement dans le logement 9. Sur les figures 1 et 2 est représenté un mode préférentiel où le rayon de courbure des lignes 43 en arc de cercle est sensiblement à la moitié d'une largeur I du logement 9. Sur la figure 3 où est représenté la moitié du logement 9 (coupé selon sa largeur I, voir figure 3), on constate davantage cette disposition. According to a variant, the center of the circle (here understood by the center of the lines 43 in an arc) is included in a plane passing through the axis (X) and is included radially in the housing 9; this plane passing through the axis (X) is included radially in the housing 9. FIGS. 1 and 2 show a preferred embodiment in which the radius of curvature of the arcuate lines 43 is substantially half of a width I of the housing 9. In FIG. 3, which shows half of the housing 9 (FIG. cut according to its width I, see Figure 3), we see this provision more.
L'évidement 5 présente une forme polygonale, circulaire, elliptique ou une combinaison des formes précitées. Classiquement, cet évidement 5 présente une forme polygonale. Dans un mode de réalisation de l'invention, l'évidement 5 présente deux premiers côtés 51 , chacun de ces premiers côtés 51 s'étendant sensiblement parallèlement à une face radiale 91 c du logement 9 le plus proche. Comme on peut le voir sur la figure 3, le premier côté 51 est radialement à une même distance de l'axe (X) du rotor 1 que la partie axiale intérieure 91 a. La portion concave 41 est à une même distance radiale de l'axe (X) qu'une portion du premier côté 51 de sorte qu'une épaisseur e est définie entre le premier côté 51 de l'évidement 5 et la portion concave 42. La portion concave 42 du logement 9 s'étend ensuite radialement vers l'extérieur du rotor 1 pour former la face radiale 91 c du logement 9. Cette face radiale 91 c du logement 9 peut comprendre une portion de retrait 92 s'étendant suivant l'axe X, est agencée à l'intersection d'une face radiale 91 c du logement 9 et de la partie axiale extérieure 91 a du logement 9.  The recess 5 has a polygonal, circular, elliptical shape or a combination of the aforementioned forms. Conventionally, this recess 5 has a polygonal shape. In one embodiment of the invention, the recess 5 has two first sides 51, each of these first sides 51 extending substantially parallel to a radial face 91c of the nearest housing 9. As can be seen in Figure 3, the first side 51 is radially at the same distance from the axis (X) of the rotor 1 as the inner axial portion 91a. The concave portion 41 is at the same radial distance from the axis (X) as a portion of the first side 51 so that a thickness e is defined between the first side 51 of the recess 5 and the concave portion 42. The concave portion 42 of the housing 9 then extends radially outwardly of the rotor 1 to form the radial face 91c of the housing 9. This radial face 91c of the housing 9 may comprise a withdrawal portion 92 extending along the X axis, is arranged at the intersection of a radial face 91c of the housing 9 and the outer axial portion 91a of the housing 9.
De manière générale, cette épaisseur e comprise entre l'évidement 5 et le logement 9 doit être suffisamment épaisse pour assurer une bonne tenue mécanique de l'aimant 14, mais elle doit être mince pour empêcher les chemins de fuite magnétique. L'agencement de l'évidement 5 pour canaliser les flux magnétiques fragilise la tenue mécanique du corps 3 mais une partie des contraintes est avantageusement transférée dans l'aimant 14 de manière à ce que les efforts soient transférés globalement radialement depuis la partie axiale intérieure 91 a vers la partie axiale extérieure 91 b ; de cette manière, le report d'une partie des efforts vers la portion saillante 41 et l'aimant permet d'amincir l'épaisseur comprise entre l'évidement 5 et le logement 9 de sorte à minimiser les chemins de fuite du flux magnétique. In general, this thickness e between the recess 5 and the housing 9 must be sufficiently thick to ensure good mechanical strength of the magnet 14, but it must be thin to prevent magnetic leakage paths. The arrangement of the recess 5 for channeling the magnetic fluxes weakens the mechanical strength of the body 3 but a part of the stresses is advantageously transferred into the magnet 14 so that the forces are transferred radially overall from the inner axial portion 91 a to the outer axial portion 91b; in this way, the transfer of a portion of the forces to the projecting portion 41 and the magnet makes it possible to thin the thickness between the recess 5 and the housing 9 so as to minimize the leakage paths of the magnetic flux.
Lorsque les évidements 5 présentent une forme issue de la combinaison d'une forme en triangle et d'une forme en trapèze, des quatrièmes côtés 52 de la forme de triangle adjacents aux premiers côtés 51 non parallèles de la forme de trapèze, définissent un angle (a) compris entre 90° et 180° par rapport aux premiers côtés 51 qui leur sont respectivement adjacents.  When the recesses 5 have a shape resulting from the combination of a triangle shape and a trapezoidal shape, fourth sides 52 of the triangle shape adjacent to the non-parallel first sides 51 of the trapezoid shape, define an angle (a) between 90 ° and 180 ° relative to the first sides 51 which are respectively adjacent to them.
Comme on peut le voir sur les figures 2 et 3, la portion saillante 41 peut préférentiellement présenter une première facette 41 1 présentant un milieu (M) définissant le centre des lignes 43 en arc de cercle. Dans une variante, la face radiale 91 c du logement 9 est sensiblement orthogonale à la première facette 41 1 de la portion en saillie 41 .  As can be seen in Figures 2 and 3, the projecting portion 41 may preferably have a first facet 41 1 having a medium (M) defining the center of the lines 43 in an arc. In a variant, the radial face 91c of the housing 9 is substantially orthogonal to the first facet 41 1 of the projecting portion 41.
Sur la figure 6, est montré un mode de réalisation dans lequel la portion saillante 41 est comprise entre des premières arêtes séparant ladite portion saillante 41 des deux portions concaves 42, lesdites deux portions concaves 42 étant comprises entre ces premières arêtes et des deuxièmes arêtes qui séparent les portions concaves 42 des faces radiales 91 c du logement 9. Comme on peut le voir sur la figure 3, les deuxièmes arête sont radialement à même distance de l'axe X qu'une portion du premier côté 51 .  FIG. 6 shows an embodiment in which the projecting portion 41 is between first edges separating said projecting portion 41 from the two concave portions 42, said two concave portions 42 lying between these first edges and second edges which separating the concave portions 42 of the radial faces 91c of the housing 9. As can be seen in FIG. 3, the second edge is radially at the same distance from the axis X as a portion of the first side 51.
Dans un autre mode de réalisation, suivant la section coupant perpendiculairement l'axe X du rotor 1 , la première facette 41 1 s'étend parallèlement au dispositif de maintien 17 et des deuxième et troisième facettes 412 parallèles de la portion saillante 41 parallèles entre elles se raccordent à la portion concave 42 à l'endroit desdites premières arêtes.  In another embodiment, according to the section perpendicularly intersecting the axis X of the rotor 1, the first facet 41 1 extends parallel to the holding device 17 and the second and third parallel facets 412 of the projecting portion 41 parallel to each other. connect to the concave portion 42 at the location of said first edges.
Comme on peut le voir sur la figure 4, grâce à la portion saillante 41 , une partie des efforts est transféré à l'aimant 14 de façon à réduire les efforts dans le corps du rotor 1 , en particulier à l'endroit de l'épaisseur e comprise entre le logement 9 et l'évidement 5. En comparant les données des figures 4 et 5 montrant les déplacements de matière en mm dans le rotor 1 , on constate qe les valeurs sont signficativement moins élevées dans le rotor 1 de la figure 4 (selon l'invention) et le rotor de la figure 5. En particulier, à l'endroit de l'épaisseur e du rotor de la figure 4, le déplacement est de 0,005498 mm alors qu'à l'endroit de l'épaisseur e du rotor de la figure 5, les déplacements sont compris entre 0,00632 mm et 0,00947 mm. On déduit de la valeur des déplacements que la répartition des contraintes pour le rotor de la figure 4 selon l'invention est plus avantageuse que pour le rotor de la figure 5. En définitive, la portion saillante 41 réduit la concentration des contraintes à l'endroit de l'épaisseur As can be seen in FIG. 4, thanks to the protruding portion 41, part of the forces is transferred to the magnet 14 so as to reduce the forces in the body of the rotor 1, in particular at the location of the thickness e between the housing 9 and the recess 5. Comparing the data of FIGS. 4 and 5 showing the displacements of material in mm in the 1, it is found that the values are significantly lower in the rotor 1 of FIG. 4 (according to the invention) and the rotor of FIG. 5. In particular, at the location of the thickness e of the rotor of FIG. 4, the displacement is 0.005498 mm whereas at the location of the thickness e of the rotor of FIG. 5, the displacements are between 0.00632 mm and 0.00947 mm. It is deduced from the value of the displacements that the distribution of the stresses for the rotor of FIG. 4 according to the invention is more advantageous than for the rotor of FIG. 5. Ultimately, the projecting portion 41 reduces the concentration of stresses to the place of thickness

Claims

REVENDICATIONS
1 . Rotor (1 ) à aimants permanents comportant : 1. Rotor (1) with permanent magnets comprising:
- un paquet de tôles formant le corps (3) du rotor (1 ) ayant un axe a bundle of sheets forming the body (3) of the rotor (1) having an axis
(X), (X)
- des logements (9) espacés régulièrement sur la circonférence du rotor (1 ) et situés dans le corps (3) du rotor (1 ), dont certains reçoivent au moins un élément sous la forme d'un aimant (14) permanent maintenu axialement à l'intérieur du logement (9) entre une partie axiale intérieure (91 a) du logement et une partie axiale extérieure (91 b), ladite partie axiale intérieure (91 a) du logement comprenant deux portions concaves (42) et une portion saillante (41 ) s'étendant axialement suivant l'axe (X), ladite portion saillante (41 ) étant radialement à plus grande proximité de la face (15) axiale interne de l'aimant (14) que les deux portions concaves (42),  - housings (9) spaced evenly on the circumference of the rotor (1) and located in the body (3) of the rotor (1), some of which receive at least one element in the form of a permanent magnet (14) held axially inside the housing (9) between an inner axial portion (91 a) of the housing and an outer axial portion (91 b), said inner axial portion (91 a) of the housing comprising two concave portions (42) and a portion protruding (41) extending axially along the axis (X), said projecting portion (41) being radially closer to the inner axial face (15) of the magnet (14) than the two concave portions (42). )
caractérisé en ce que des évidements (5) sont ménagés dans le corps (3) et positionnées entre les logements (9) sur une trajectoire reliant successivement les portions saillantes (41 ) des logements (9) consécutifs, et en ce que l'aimant est maintenu axialement et radialement au moyen d'un dispositif de maintien (17) s'étendant axialement à l'intérieur du logement (9) entre la partie axiale intérieure du logement et ladite face (15) axiale de l'aimant (14). characterized in that recesses (5) are provided in the body (3) and positioned between the housings (9) on a path successively connecting the protruding portions (41) of the consecutive housings (9), and in that the magnet is held axially and radially by means of a holding device (17) extending axially inside the housing (9) between the inner axial portion of the housing and said axial face (15) of the magnet (14) .
2. Rotor (1 ) à aimants permanents selon la revendication 1 , caractérisé en ce que les portions concaves (42) présentent des contours extérieurs formés par des lignes (43) en forme d'arc de cercle. 2. rotor (1) permanent magnet according to claim 1, characterized in that the concave portions (42) have outer contours formed by lines (43) shaped circular arc.
3. Rotor (1 ) à aimants permanents selon la revendication 2, caractérisé en ce que la portion saillante (41 ) présente une première facette (41 1 ) présentant un milieu (M) définissant le centre des lignes (43) en arc de cercle. 3. Rotor (1) with permanent magnets according to claim 2, characterized in that the projecting portion (41) has a first facet (41 1). having a medium (M) defining the center of the lines (43) in an arc.
4. Rotor (1 ) à aimants permanents selon l'une quelconque des revendications 2 ou 3, caractérisé en ce que les lignes (43) en arc de cercle des contours extérieurs des portions concaves (42) ont un centre de cercle commun. 4. Rotor (1) with permanent magnets according to any one of claims 2 or 3, characterized in that the lines (43) arcuate outer contours of the concave portions (42) have a common circle center.
5. Rotor (1 ) à aimants permanents selon l'une quelconque des revendications 2 à 4, caractérisé en ce que le centre du cercle est compris dans un plan passant par l'axe (X) et est compris radialement dans le logement (9). 5. Rotor (1) with permanent magnets according to any one of claims 2 to 4, characterized in that the center of the circle is included in a plane passing through the axis (X) and is included radially in the housing (9). ).
6. Rotor (1 ) à aimants permanents selon l'une quelconque des revendications 2 à 5, caractérisé en ce que le rayon de courbure des lignesRotor (1) with permanent magnets according to one of Claims 2 to 5, characterized in that the radius of curvature of the lines
(43) en arc de cercle est sensiblement égal à la moitié d'une largeur (I) du logement (9) (43) in an arc is substantially equal to half a width (I) of the housing (9)
7. Rotor (1 ) à aimants permanents selon l'une quelconque des revendications précédentes, caractérisé en ce que l'évidement (5) présente deux premiers côtés (51 ), chacun de ces premiers côtés (51 ) s'étendant sensiblement parallèlement à une face radiale (91 c) du logement (9) le plus proche. Rotor (1) with permanent magnets according to one of the preceding claims, characterized in that the recess (5) has two first sides (51), each of these first sides (51) extending substantially parallel to a radial face (91c) of the housing (9) closest.
8. Rotor (1 ) à aimants permanents selon l'une quelconque des revendications 1 à 8, caractérisé en ce que l'épaisseur (e) comprise entre la face radiale (91 c) d'un logement (9) et le côté (51 ) d'un évidement suivant est amincie pour limiter les chemins de fuite magnétique. Rotor (1) with permanent magnets according to any one of claims 1 to 8, characterized in that the thickness (e) between the radial face (91c) of a housing (9) and the side ( 51) of a subsequent recess is thinned to limit the magnetic leakage paths.
9. Rotor (1 ) à aimants permanents selon l'une quelconque des revendications 3 à 7 prises en dépendance de la revendication 8, caractérisé en ce que ladite face radiale (91 c) est sensiblement orthogonale à la première facette (41 1 ) de la portion en saillie. 9. Rotor (1) with permanent magnets according to any one of claims 3 to 7 taken in dependence on claim 8, characterized in that said radial face (91c) is substantially orthogonal to the first facet (41 1) of the projecting portion.
10. Rotor (1 ) à aimants permanents selon l'une quelconque des revendications précédentes, caractérisé en ce que ladite trajectoire est circulaire et a pour centre le point O, le point O étant à l'intersection entre l'axe (X) du rotor (1 ) et ladite section coupant perpendiculairement l'axe (X) du rotor (1 ). 10. Rotor (1) with permanent magnets according to any one of the preceding claims, characterized in that said trajectory is circular and has the center point O, the point O being at the intersection between the axis (X) of rotor (1) and said section intersecting perpendicularly the axis (X) of the rotor (1).
1 1 . Rotor (1 ) à aimants permanents selon l'une quelconque des revendications précédentes, caractérisé en ce que ladite trajectoire s'étend suivant une longueur (L) maximale de l'évidement (5). 1 1. Rotor (1) with permanent magnets according to any one of the preceding claims, characterized in that said path extends along a maximum length (L) of the recess (5).
12. Rotor (1 ) à aimants permanents selon l'une quelconque des revendications précédentes, caractérisé en ce que les évidements (5) présentent une forme issue de la combinaison d'une forme en triangle et d'une forme en trapèze. Rotor (1) with permanent magnets according to one of the preceding claims, characterized in that the recesses (5) have a shape resulting from the combination of a triangle shape and a trapezoidal shape.
13. Rotor (1 ) à aimants permanents selon la revendication précédente, caractérisé en ce que des quatrièmes côtés de la forme de triangle adjacents à deux premiers côtés (51 ) non parallèles de la forme de trapèze, définissent un angle (a) compris entre 90° et 180° par rapport aux premiers côtés (51 ) qui leur sont respectivement adjacents. 13. Rotor (1) with permanent magnets according to the preceding claim, characterized in that fourth sides of the triangle shape adjacent to two first non-parallel sides (51) of the trapezoidal shape, define an angle (a) between 90 ° and 180 ° relative to the first sides (51) which are respectively adjacent to them.
14. Rotor (1 ) à aimants permanents selon l'une quelconque des revendications précédentes, caractérisé en ce qu'une portion de retrait (92) s'étendant suivant l'axe (X), est agencée à l'intersection d'une face radiale (91 c) du logement (9) et d'une partie axiale extérieure du logement (9). 14. Rotor (1) with permanent magnets according to any one of the preceding claims, characterized in that a withdrawal portion (92) extending along the axis (X), is arranged at the intersection of a radial face (91 c) of the housing (9) and an outer axial portion of the housing (9).
15. Rotor (1 ) à aimants permanents selon l'une quelconque des revendications précédentes, caractérisé en ce que le dispositif de maintien (17) présente un contact avec la portion saillante (41 ) tout le long du logement (9), suivant l'axe (X). 15. Rotor (1) with permanent magnets according to any one of the preceding claims, characterized in that the holding device (17) has a contact with the protruding portion (41) all along the housing (9) along the axis (X).
16. Rotor (1 ) à aimants permanents selon l'une quelconque des revendications précédentes, caractérisé en ce que la portion saillante (41 ) est comprise entre des premières arêtes séparant ladite portion saillante (41 ) des deux portions concaves (42), lesdites deux portions concaves (42) étant comprises entre ces premières arêtes et des deuxièmes arêtes qui séparent les portions concaves (42) des faces radiales du logement (9). 16. Rotor (1) with permanent magnets according to any one of the preceding claims, characterized in that the projecting portion (41) is between first edges separating said projecting portion (41) of the two concave portions (42), said two concave portions (42) being between these first edges and second edges which separate the concave portions (42) of the radial faces of the housing (9).
17. Rotor (1 ) à aimants permanents selon l'une des revendications revendication 13 à 16 quand dépendantes des revendications 3 et 12, caractérisé en ce que, suivant une section coupant perpendiculairement l'axe (X) du rotor (1 ), la première facette (41 1 ) s'étend parallèlement au dispositif de maintien (17) et des deuxième et troisième facettes (412) parallèles entre elles se raccordent à la portion concave (42) à l'endroit desdites premières arêtes (43). 17. Rotor (1) with permanent magnets according to one of claims claims 13 to 16 when dependent on claims 3 and 12, characterized in that, in a section perpendicularly intersecting the axis (X) of the rotor (1), the first facet (41 1) extends parallel to the holding device (17) and the second and third facets (412) parallel to each other are connected to the concave portion (42) at the location of said first edges (43).
18. Rotor (1 ) à aimants permanents selon l'une quelconque des revendications précédentes, caractérisé en ce que le logement (9) présente un contour fermé suivant une section coupant perpendiculairement l'axe (X) du rotor (1 ). 18. Rotor (1) with permanent magnets according to any one of the preceding claims, characterized in that the housing (9) has a closed contour in a cross section perpendicular to the axis (X) of the rotor (1).
19. Rotor (1 ) à aimants permanents selon l'une quelconque des revendications précédentes, caractérisé en ce que les évidements (5) sont ménagés dans le corps (3) et positionnées entre les logements (9) sur une trajectoire reliant successivement les portions saillantes (41 ) des logements (9) consécutifs, suivant une section coupant perpendiculairement l'axe (X) du rotor (1 ). 19. Rotor (1) with permanent magnets according to any one of the preceding claims, characterized in that the recesses (5) are formed in the body (3) and positioned between the housing (9) on a path connecting successively portions protruding (41) consecutive housing (9), in a section perpendicularly intersecting the axis (X) of the rotor (1).
20. Alternateur comprenant un rotor (1 ) selon l'une des revendications précédentes. 20. Alternator comprising a rotor (1) according to one of the preceding claims.
EP14750573.9A 2013-07-29 2014-07-16 Rotor with permanent magnets Withdrawn EP3028368A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1357484A FR3009140B1 (en) 2013-07-29 2013-07-29 ROTOR WITH PERMANENT MAGNETS
PCT/FR2014/051827 WO2015015084A2 (en) 2013-07-29 2014-07-16 Rotor with permanent magnets

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EP3028368A2 true EP3028368A2 (en) 2016-06-08

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EP (1) EP3028368A2 (en)
CN (1) CN105431999B (en)
FR (1) FR3009140B1 (en)
WO (1) WO2015015084A2 (en)

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FR3009140B1 (en) 2017-02-24
FR3009140A1 (en) 2015-01-30
US20160172916A1 (en) 2016-06-16
CN105431999B (en) 2019-05-03
WO2015015084A3 (en) 2015-10-15
WO2015015084A2 (en) 2015-02-05
CN105431999A (en) 2016-03-23
US10008891B2 (en) 2018-06-26

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