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
  • 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
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
  • H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
  • H02K15/03—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies having permanent 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
  • H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures

Definitions

• the present invention relates to the field of rotating electrical machines, in particular for motor vehicles.
• the field of the invention relates more particularly rotor-stator assemblies comprising magnetic elements to be maintained in the enclosure of the rotor.
• Rotating electrical machines generally include a rotor-stator assembly. Electrical machines allow, depending on the type of operation envisaged, to generate a current or to produce a mechanical power from an induction current. In these two modes of operation, the rotor and the stator comprise either a coil or permanent magnets to generate a magnetic flux.
• this solution is not optimal from the point of view of the constitution of the magnetic pole.
• the assembly of the springs is long and the maintenance of the magnets is not made optimal.
• this solution is not optimal during the assembly operation when a rotor pole comprises cavities having a complex profile.
• the invention overcomes the aforementioned drawbacks.
• the invention relates to a rotating electrical machine comprising a rotor intended to be mounted on a shaft, the rotor being arranged to be rotated relative to the stator, said rotor comprising:
• each pole being formed by two adjacent cavities having a V-shaped or U-shaped profile in a plane orthogonal to the axis in which the shaft is of the electric machine, said cutting plane;
• a spring having two arms connected to a connecting portion and forming an axial stop, the two arms being inserted into each of the cavities of a pole to exert a holding force of the magnets on the outer edge of the rotor.
• One advantage is to maintain a constant force on the magnets to the outer diameter of the rotor once they are placed in the rotor.
• An advantage of the double sipe is to simplify the assembly and to exert an increased stress on the magnets.
• each arm forms a lamella having a plurality of bumps, each bump exerting a force in the cutting plane maintaining the magnet with which it is associated.
• each arm has an end portion forming an axial stop for holding the magnets of a cavity on an axial side of the rotor.
• each end portion exerts a restoring force in the direction of the axis of the rotor when it is mechanically biased in the axis.
• One advantage is to absorb some of the mechanical stresses on the rotor while holding the magnets in their housing.
• the connecting portion is deformable so as to allow folding to position the arms in parallel or substantially parallel directions to allow the introduction of the spring in a notch having two adjacent cavities.
• One advantage is to make it possible to produce springs more easily insofar as they are defined in a common sheet and then folded during the rotor assembly operation.
• the connecting portion comprises a flat portion forming a bearing surface extending on a transverse surface of the rotor. An advantage is to improve the robustness of the arms and the maintenance of the springs.
• each cavity is adapted to receive an arm having four bumps each, each bump being adapted to maintain a magnet in a transverse plane.
• This configuration is particularly advantageous for the sizing of certain electrical machines used in conjunction with a heat engine, particularly with regard to the magnetic performance of the rotor.
• the invention relates to a method of mounting a rotating machine comprising a rotor, said method comprising: An insertion of at least one spring, comprising two arms connected to a connecting portion and forming an axial abutment, in two adjacent cavities of a pole of the rotor;
• FIG. 1 a rotor of the prior art comprising magnets introduced into longitudinal cavities of said rotor and held by flexible lamellae
• FIG. 2A a perspective view of a rotor of a rotating machine according to the invention
• Figure 2B a sectional view of a rotor of a rotating machine shown in Figure 2A;
• Figure 3 a sectional view of a spring of the invention introduced into an opening of the rotor of the invention
• Figure 4 a connection portion of a bimetallic spring of the invention
• Figure 5 is a top view of a notch having two cavities adapted to receive a spring of the invention.
• the rotating machine comprises a not shown drive shaft which is for example engaged in the rotor 1. Generally two modes of operation are possible.
• a first mode of operation comprises generating a stator supply current to induce a magnetic field so as to drive the drive shaft under the effect of the rotation of the rotor 1. This mode is used in particular when starting the vehicle.
• a second mode of operation said generator or alternator, allows from the rotation of the drive shaft to engage the rotation of the rotor 1. Under the effect of the rotation of the magnets, a current induced in the coils is created and can power the electric machine. This mode of operation can be used, for example, to assist the heat engine.
• FIG. 2A shows a rotor 1 of a rotating machine of the invention shown in perspective.
• FIG. 2B represents a view from above of the rotor 1.
• the rotor 1 has a substantially cylindrical shape and has a circumferential surface and two transverse surfaces whose shape is substantially a disc.
• stator of the electric rotary machine is not shown in the figures. It can be for example a pinned stator pins.
• the perspective view of the rotor 1 also represents the spring 12 having a V profile in the cross-section Pc and magnets 10.
• the spring 12 and the magnets are inserted along the axis 2 of the rotor 1 in one of the arranged poles at the periphery of the rotor 1 and having two cavities 5, 5 'adjacent and each extending along the axis of the rotor 2.
• Each pole comprises two cavities 5, 5 'longitudinal extending along a first and a second transverse axes in the cutting plane Pc in a form adapted to receive magnets.
• the two transverse axes associated with a pole form an angle which is substantially the same angle as that formed by the two portions of the V-shaped profile of the spring 12.
• the shape of the pole is therefore adjusted and adapted to receive a spring 12.
• the passage extends longitudinally along an axis parallel to the axis 2 of the rotor 1. This passage therefore extends along the axis of the edge formed by the V-shaped profile.
• each spring 12 is plugged into a double longitudinal cavities 5 and 5 '.
• connection portion 123 comprises a flat portion shown in FIG. 4.
• the flat surface makes it possible to form a bearing and / or abutment surface with respect to the rotor 1 to block a movement of the spring 12 in a direction parallel to the axis 2 of the rotor 1.
• the flat allows to adjust the length of each arm plugged into the cavities and makes sure that the spring 12 is inserted to the end, that is to say until the contact of the flat on the transverse surface of the rotor 1.
• FIG. 4 is a perspective view of a spring of the invention and represents for this purpose a portion of each arm 120, 120 ', each being connected to the flat by means of a connecting portion 122, 122' providing a certain deformability to insert the arms 120, 120 'in the cavities 5, 5'.
• Figure 5 shows a sectional view of the notch 5, 5 '.
• a hatched portion 55 forms a bearing surface of the transverse surface of the rotor 1 on which the flat can extend.
• the magnets of a notch 5, 5 ' are considered in pairs in a cutting plane Pc to form a magnetic pole having a V-shaped section. to reduce the necessary mass of magnets and thus makes it possible to limit the radial extent of an equivalent V-shaped non-profiled magnet.
• the two arms 120, 120 ' form a wall closing the passage between the two longitudinal cavities 5, 5'.
• the connecting portion 123 makes it possible to reinforce the holding of each arm 120, 120 introduced into a longitudinal cavity 5, 5 'and therefore of the spring 12.
• Such a spring 12 has a better resistance to the vibrations and to the movements generated by the rotation of the rotor 1.
• Each recess 5, 5 'of a recess comprises lateral portions forming holding abutments for each arm 120, 120' of the spring 12.
• FIG. 5 represents an abutment 50, 50 'and an abutment 51, respectively 51' for maintain each arm in the cavity 5 into which it is introduced, respectively 5 '.
• the stops 50, 51 make it possible to maintain the restoring force of the spring 12 on the magnets 10 without the arms 120, 120 'of the spring 12 being able to evolve out of the cavity 5, 5'.
• each lamella comprises a plurality of bumps 125 acting as a spring exerting a holding force in a plane transverse to the spring 12, that is to say a plane parallel to the plane Pc. This holding force makes it possible to retain the magnets which are inserted into the cavities 5, 5 'along the arms 120, 120'.
• each bump 125 makes it possible to retain a magnet 10 vis-à-vis the bump 125 and thus press it against the wall of the longitudinal cavity 5 or 5 '.
• each lamella comprises a single bump 125 extending along the length of the arm 120.
• the boss 125 of the lamella exerts a force along the lamella with a maximum force in the center.
• One or more magnets 10 may be retained in a plane Pc by such an arm.
• the slats forming the arms of the spring 12 are advantageously made of stainless steel. Any other non-magnetic material for producing the springs is suitable for the solution of the invention.
• One advantage is to avoid the creation of short circuits with the magnets while allowing the creation of a pair of magnets having a V-shaped section in a slice according to a section plane Pc.
• the nonmagnetic material of the spring 12 makes it possible not to alter the magnetic flux created by the pair of magnets forming a V-shaped pole in a transverse section.
• each magnet 10 has a parallelepipedal shape.
• Each magnet 10 is inserted into a cavity whose profile is compatible with a rectangular shape in the cutting plane Pc.
• the magnets 10 may have a parallelepiped shape right or cylindrical.
• the magnets 10 have a length less than a quarter of the length of the rotor 1. According to an exemplary embodiment, four magnets 10 are inserted into each cavity 5, 5 '. In this example, each arm 120, 120 'has four bumps 125 for retaining the four magnets 10 in a transverse plane Pc.
• two magnets are introduced into each longitudinal cavity 5, 5 '.
• a single magnet is introduced into each longitudinal cavity 5, 5 '.
• the rotor 1 comprises a cover (not shown) allowing to limit the axial displacements of the spring 12.
• the bonnet prevents the springs 12 from coming out of their housing under the effect of the movements of the rotor 1.
• the hood makes it possible to retain the dust of magnets that can be produced by friction.
• the hood makes it possible to avoid the exit of the magnets 10 which would be ejected from their housing under the effect of the centrifugal force of the rotor 1 and this in spite of the restoring force exerted by the spring 12 on the magnets 10.
• each end portion 124, 124 'respectively of an arm 120, 120' also exerts an axial restoring force so as to push the magnet 10 which is positioned at the end of the cavity 5, 5 'of the rotor 1.
• each end portion 124, 124 ' acts as a stop preventing the magnets 10 from leaving the cavities 5, 5'. They can also act as a spring pushing the magnet 10 back to its position in the cavity 5, 5 '. This solution provides better resistance to shocks and vibrations.
• FIG. 2A shows a top view of the rotor 1 in a plane Pc.
• the rotor 1 comprises a central axial opening 6 allowing the passage of a not shown drive shaft.
• openings 8 are made to lighten the weight of the rotor 1. In addition, these openings 8 also allow the passage of screws for fixing the cover. In the exemplary case of Figure 2A, there are eight openings 8 disposed in the circumference of an inner circle to the section of the rotor 1 and surrounding the central axial opening 6. The shape of the openings 8 may have a profile circular, square, trapezoidal, diamond or parallelepiped.
• only a few openings 8, for example four openings 8, are used for the passage of fixing screws.
• the other openings 8 make it possible to lighten the weight of the rotor 1.
• openings 7 are made for the passage of fasteners to maintain the structure of the rotor 1.
• the latter comprises a plurality of sheets of sheets, these elements make it possible to ensure a certain compactness of the frame forming the rotor 1.
• fixing rods such as rivets are inserted in each opening and passes through the length of the rotor 1 to fix the hood at the opposite end of the rotor 1.
• the shape of the openings 7 may have a profile circular, square, trapezoidal, diamond or parallelepiped.
• the method of mounting an electric rotary machine comprising a rotor comprises:
• a connecting portion 123 connecting the two arms 120, 120 ' comprises a flat part for limiting and controlling the insertion of the arms in each slot ⁇ 5, 5' ⁇ .
• the method comprises:
• the method of the invention comprises:

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

Applications Claiming Priority (2)

Publications (1)

Family

ID=59253560

Family Applications (1)

Country Status (4)

Family Cites Families (8)

• 2016
  • 2016-12-21 FR FR1663049A patent/FR3060891A1/fr active Pending
• 2017
  • 2017-12-18 WO PCT/FR2017/053646 patent/WO2018115678A1/fr unknown
  • 2017-12-18 EP EP17829234.8A patent/EP3560074A1/de not_active Withdrawn
  • 2017-12-18 CN CN201780079681.7A patent/CN110114961A/zh active Pending

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