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
  • H02K1/32—Rotating parts of the magnetic circuit with channels or ducts for flow of cooling medium
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K9/00—Arrangements for cooling or ventilating
  • H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
  • H02K9/04—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
  • H02K9/06—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium with fans or impellers driven by the machine shaft

Definitions

• the present invention relates to rotating electrical machines, and more particularly those cooled by circulation of a cooling fluid, in particular air, circulating at least partially around the rotor of the machine.
• the invention relates more particularly to synchronous or asynchronous alternating current machines. It concerns in particular traction or propulsion machines for electric (Battery Electric Vehicle) and/or hybrid (Hybrid Electric Vehicle - Plug-in Hybrid Electric Vehicle) motor vehicles, such as individual cars, vans, trucks or buses.
• the invention also applies to rotating electrical machines for industrial and/or energy production applications, in particular naval, aeronautical or wind turbines.
• Application CN 211266684 discloses a flange comprising rectilinear fins.
• Applications KR 10-2018-0094446, CN 207459903 and EP 3 672 035 disclose flanges not comprising cavities delimited at least by a circumferential edge extending along the edge of the flange.
• Each cavity can be delimited at least partially by two fins and a circumferential border.
• the ratio between the width of a circumferential edge and the external diameter of the flange can be between 1 and 25%, better between 2 and 20%, better between 3 and 15%, better between 4 and 10%, being for example around 4.5% or 6%.
• the circumferential edge can connect the radial ends closest to the edge of the flange of two consecutive fins.
• the circumferential edge can connect the radial ends closest to the edge of the flange of two consecutive fins surrounding a cavity, so that said cavity is delimited over its entire periphery by the two fins and by the circumferential edge.
• a line connecting an edge of a fin and the portion of a cavity closest to the interior face may not include a portion of plane contained in a plane perpendicular to the axis of rotation. In other words, there may not be any flat surface between the adjacent fin and cavity.
• the fin can be placed at the edge of the cavity.
• a length of the cavity into which the radial opening opens measured in a circumferential direction, can be between 5 and 500 mm, better between 10 and 200 mm, even better between 15 and 100 mm, even better between 20 and 80 mm , even better between 30 mm and 60 mm, being for example of the order of 37 mm.
• the radial opening may have parallel lateral edges when the edge of the flange is observed in a radial direction.
• the radial opening may have flared edges when the edge of the flange is observed in a radial direction.
• the edges of the radial opening can flare towards the exterior face of the flange. Such a flared radial opening allows a wider flow of air to be ejected towards the coil heads.
• the lateral edges of the radial opening can be inclined relative to a plane containing the axis of rotation X and passing through the radial end of the fin closest to the edge when observing the following flange the X axis of rotation.
• the two side edges of the same radial opening can be parallel to each other.
• the two side edges of the same radial opening may not be parallel to each other.
• the two side edges of the same radial opening can have different inclinations with respect to a plane containing the axis of rotation X and passing through the radial end of the fin closest to the edge when the flange is observed along the axis of rotation X.
• the lateral edges of a radial opening can be inclined relative to a plane containing the axis of rotation and passing through the radial end of the fin closest to the edge when observed the flange along the axis of rotation
• At least one cavity in particular half of the cavities, better still all the cavities, may include a circumferential edge devoid of a radial opening provided in the edge of the flange.
• At least one cavity in particular at least half of the cavities, better still all the cavities, may include a circumferential border with at least one portion of variable thickness.
• the thickness of the circumferential border can be measured on the slice along the axis of rotation
• At least one cavity in particular at least half of the cavities, better still all the cavities, can include a circumferential border with a constant thickness.
• the flange may comprise an alternation of cavities comprising a circumferential border with a radial opening provided in the edge of the flange and cavities comprising a circumferential border of constant thickness.
• the circumferential edge may be located on the exterior face of the flange.
• the flange may comprise an alternation of cavities comprising a circumferential border with a portion of variable thickness and cavities comprising a circumferential border of constant thickness.
• the fin can have a height measured along the constant axis of rotation
• the fin can have a height measured along the variable axis of rotation X.
• the fin can have a variable height over its entire length in a radial direction. It can for example vary in height by having a rounded, rectangular, triangular shape or any other shape when we observe the flange in section along a plane containing the axis of rotation X.
• the height of the fin measured along the axis of rotation X may be less than or equal to the thickness of the circumferential edge measured along the axis of rotation along the axis of rotation flange in a radial direction with a height which can be between 1 mm and 10 mm, better between 3 mm and 5 mm.
• Such a fin improves air circulation and offers an additional exchange surface.
• the portion of the fin exceeding the circumferential edge along the axis of rotation X can extend over the entire length of the fin measured in a radial direction.
• the portion of the fin exceeding the circumferential edge along the axis of rotation X can extend over only part of the length of the fin measured in a radial direction
• the angle of inclination between the internal surface of a cavity and a plane perpendicular to the axis of rotation can be variable.
• the angle of inclination between the internal surface of a cavity and a plane perpendicular to the axis of rotation can be between 2° and 60°, better still between 5° and 30°, even better between 10° and 20° , being for example of the order of 15°, when observed in section along a plane perpendicular to a radial axis extending between two consecutive cavities.
• a flange may include at least two fins having variations in radii of different curvature.
• Each fin may include an upper face contained in a plane perpendicular to the axis of rotation and a first and a second lateral face connecting the upper face to each of the adjacent cavities, at least one fin having an upper face connected to the first lateral face by a portion inclined relative to the exterior face of the flange when observing the flange in the radial direction.
• the upper face can be connected to each of the first and second side faces by an inclined portion.
• the angle of inclination of the inclined portion relative to the upper face of the fin can be between 0° value excluded and 80°, better between 5° and 50°, better between 10° and 20°, being by example of the order of 15°.
• Such an inclined portion makes it possible to reduce losses and better direct the air flow towards possible radial openings.
• the flange may include at least one fin not having an inclined portion between its upper face and one of the side faces.
• the first lateral face may be concave in a plane perpendicular to the axis of rotation.
• the first side face may be convex in a plane perpendicular to the axis of rotation.
• the invention also relates, independently or in combination with the above, to a rotor of an electric machine rotating around an axis of rotation X, the rotor comprising a rotor mass and at least one flange as described above, in particular a flask or two flasks as described above.
• the rotor comprises a single flange as described above.
• the rotor may include two flanges as described above, each of the flanges being arranged in particular at one end of the rotor mass.
• the rotor is cooled by circulation of a cooling gas, in particular air.
• the number of cavities in a flange can be equal to the number of poles of the rotor.
• the number of fins on a flange can be equal to the number of poles on the rotor.
• the number of fins on a flange can be equal to the number of cavities in the flange.
• the flange can have 8 cavities and 8 fins.
• the rotation speed of the rotor can be between 2,000 rpm and 30,000 rpm, better between 5,000 rpm and 25,000 rpm, better between 10,000 rpm and 20,000 rpm, being for example of the order of 17,000 rpm or 18,000 rpm.
• the flange according to the invention makes it possible to effectively cool the rotor, even with high rotation speeds.
• the invention also relates to an electric machine comprising a stator and a rotor as defined above.
• the machine can be used as a motor or generator.
• the machine can be reluctance. It can constitute a synchronous motor or, alternatively, a synchronous generator. As a further variant, it constitutes an asynchronous machine.
• the machine may comprise a single inner rotor or, alternatively, an inner rotor and an outer rotor, arranged radially on either side of the stator and coupled in rotation.
• the machine can be inserted alone into a casing or inserted into a gearbox casing. In this case, it is inserted into a casing which also houses a gearbox.
• the casing is, for example, cooled by water.
• each of the notches has a continuously closed contour.
• continuously closed we mean that the notches present a continuous closed contour when observed in cross section, taken perpendicular to the axis of rotation of the machine. You can go all the way around the notch without encountering a cut in the stator mass.
• the electrical conductors may not be arranged in the slots loosely but in an orderly manner. They are stacked in the notches in a non-random manner, for example being arranged in rows of aligned electrical conductors.
• the stacking of electrical conductors is for example a stacking according to a hexagonal network in the case of electrical conductors of circular cross section.
• the stator may include electrical conductors housed in the notches. At least electrical conductors, or even a majority of electrical conductors, can be pin-shaped, U-shaped or I-shaped.
• the pin can be U-shaped (“U-pin” in English) or straight, being in form of I (“I-pin” in English).
• the electrical conductors can thus form a distributed winding.
• the winding may not be focused or wound on tooth.
• the stator has concentrated winding.
• the stator may have teeth and coils disposed on the teeth. The stator can thus be wound on teeth, in other words with undistributed winding.
• the stator teeth can be made with a stack of magnetic sheets, each covered with an insulating resin, in order to limit losses through induced currents.
• Figure 2a is a perspective view of the flange of Figure 1 observed from the side of its exterior face
• Figure 2b is a front view of the flange of Figure 2a
• Figure 2d is a view of the flange of Figure 2b along section D2-D2,
• Figure 3a is a view similar to Figure 2b of a flange according to another alternative embodiment
• Figure 3b is a view similar to Figure 2e of the alternative embodiment of Figure 3 a,
• Figure 3c is a view of the flange of Figure 3a along section C3-
• Figure 4a is a view similar to Figure 2b of a flange according to another alternative embodiment
• Figure 4c is a view of the flange of Figure 4a along the section C4-C4,
• Figure 5a is a view similar to Figure 2b of a flange according to another alternative embodiment
• Figure 5b is a view similar to Figure 2e of the alternative embodiment of Figure 5 a,
• Figure 5c is a view of the flange of Figure 5a along section C5-C5,
• Figure 5d is a view similar to Figure 2a of the flange of Figure 5a,
• Figure 5e is a view similar to Figure 2f of the flange of Figure 5a,
• Figure 6a is a view similar to Figure 2b of a flange according to another alternative embodiment
• Figure 6b is a view similar to Figure 2e of the alternative embodiment of Figure 6a,
• Figure 6c is a view of the flange of Figure 6a along section C6-C6,
• Figure 6e is a view similar to Figure 2f of the flange of Figure 6a,
• Figure 7a is a view similar to Figure 2b of a flange according to another alternative embodiment
• Figure 7b is a view of the flange of Figure 7a along section B7-B7,
• Figure 7c is a view similar to Figure 2a of the flange in Figure
• Figure 7d is a view similar to Figure 7c from another viewing angle
• Figure 8a is a view similar to Figure 2b of a flange according to another alternative embodiment
• the internal surface 150 of the cavities 15 has a convex internal surface with a radius of curvature which decreases when we observe the flange 10 in a radial direction as we approach the edge of the flange.
• the fins 16 each comprise an upper face 161 contained in a plane perpendicular to the axis of rotation and a first 162 and a second 163 lateral faces connecting the upper face 161 to each of the cavities 15 adjacent.
• the fins have a portion 160 inclined relative to the exterior face 11 of the flange 10 and connecting the upper face 161 to the first lateral face 162 when the flange is observed in the direction radial.
• the first side face 162 is convex in a plane perpendicular to the axis of rotation the radial end of a fin 16 closest to the edge 14 and by the radial end closest to the central bore 13 on the side of the first side face 161, and a plane P containing the axis of rotation and passing through the radial end of the fin 16 closest to the edge 14 when the flange is observed in a section in a plane perpendicular to the axis of rotation X, is for example of the order of 30° .
• the interior face 12 of the flange 10 is not smooth.
• the interior face has, for example, material recesses 152 at the level of the fins of the exterior face 11. These material recesses 152 make it possible to limit the weight of the flange.
• the portion 180 of the radial opening closest to the interior face 12 of the flange 10 is curved when observed in a radial direction.
• the flange has six cavities 15. All the cavities 15 include a circumferential edge 17 with a radial opening 18 formed in the edge 14 of the flange.
• FIG. 5a to 5e Another alternative embodiment of a flange 10 is illustrated in Figures 5a to 5e.
• the flange 10 has eight cavities 15.
• Each cavity 15 has a circumferential edge 17 which connects the most radial ends 166. close to the edge 14 of the flange of two consecutive fins 16 surrounding this cavity 15, so that said cavity 15 is delimited over its entire periphery by the two fins 16 and by the circumferential edge 17.
• the interior face 12 of the flange does not have material recesses 152 at the level of the fins 16 of the exterior face 11.
• FIG. 6a to 6e is substantially similar to the embodiment of Figures 5a to 5e.
• the difference between these two embodiments is that in the embodiment of Figures 6a to 6e all the cavities 15 include a circumferential border 17 with at least one portion of variable thickness 170.
• Figures 7a to 7d is substantially similar to the embodiment of Figures 5a to 5e. The difference between these two embodiments is that in the embodiment of Figures 7a to 7d all the cavities 15 include a circumferential border 17 of constant thickness.
• Figures 8a to 8d illustrate an embodiment substantially similar to the embodiment of Figures 2a to 2e.
• the radial openings 18 have lateral edges 181 that flare when the edge 14 of the flange is observed in a radial direction.
• the edges 181 of the radial opening 18 flare towards the exterior face 11 of the flange.
• Figures 9a and 9b illustrate an embodiment substantially similar to the embodiment of Figures 2a to 2e.
• the first side face 162 is concave in a plane perpendicular to the axis of rotation.
• the lateral edges 181 of the radial opening 18 are inclined relative to the plane P containing the axis of rotation X and passing through the radial end of the fin 16 closest to the slice 14 when we observe the flange in a section in a plane perpendicular to the axis of rotation radial opening 18 and a plane P containing the axis of rotation of rotation X is of the order of 30°.
• the fins have a height measured along the constant axis of rotation X. Furthermore, in these modes the height of the fins measured along the axis of rotation X is substantially equal to the thickness of the circumferential edge measured along the axis of rotation X.
• the flange may have a different number of cavities. It may also include fins and/or cavities of different sizes and/or shapes.

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• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Iron Core Of Rotating Electric Machines (AREA)
• Motor Or Generator Frames (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=84569299

Family Applications (1)

Country Status (3)

Family Cites Families (16)

• 2022
  • 2022-10-17 FR FR2210713A patent/FR3141015A1/fr active Pending
• 2023
  • 2023-10-13 EP EP23810424.4A patent/EP4606017A1/de active Pending
  • 2023-10-13 WO PCT/FR2023/051598 patent/WO2024084158A1/fr not_active Ceased

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