Fan wheel and motor for rotor

Abstract

The invention relates to a fan wheel (10) for an electric motor (14) of a motor vehicle, comprising an annularly constructed base body (16), the base body having at least one intake opening (28) and an air deflection region (30), the air deflection region being constructed adjacent to the intake opening (28) in the peripheral direction of the base body (16), wherein the annularly constructed base body (16) comprises a first side surface (18) and a second side surface (20) which is constructed spaced apart from the first side surface (18) in the axial direction of the base body (16), a plurality of first fan wheel blades (36) being arranged spaced apart from one another in the peripheral direction of the base body (16) being arranged on the first side surface (18), and a plurality of second fan wheel blades (50) being arranged spaced apart from one another in the peripheral direction of the base body (16) being arranged on the second side surface (20).

Description

Technical Field

[0001] The invention relates to a fan wheel for a rotor of an electric machine, wherein the fan wheel is designed and / or constructed such that a cooling medium can flow through the rotor in a convective manner and the winding ends of a stator surrounding the rotor can be effectively cooled. The invention also relates to an electric machine for a motor vehicle, comprising a rotor and a fan wheel according to the invention. Background Art

[0002] Electric machines for motor vehicles are known in principle. Such known electric machines generally have a rotor, on the respective end faces of which a fan wheel is arranged. It is also known that a cooling medium can flow through the rotor in a convective manner. Such technical descriptions are known, for example, from EP 2 002 526 B1.

[0003] The aim is to improve the cooling effect of the electric machine, in particular the cooling effect of the winding head of the stator surrounding the rotor in the circumferential direction. In this way, the efficiency of the electric machine can be improved. Summary of the invention

[0004] The object of the present invention is to provide a fan wheel for an electric machine, with which the cooling effect of the electric machine, in particular the cooling effect on the winding heads of the stator surrounding the rotor in the circumferential direction, can be increased.

[0005] This object is achieved by the technical solution of the independent claim. Preferred developments of the invention are derived from the dependent claims, the description and the drawings, wherein each feature can represent an aspect of the invention both individually and in combination.

[0006] According to the present invention, a fan wheel for an electric motor of a motor vehicle is provided, the fan wheel having an annularly constructed base body, the base body having at least one intake opening and an air deflection area, the air deflection area being constructed next to the intake opening in the peripheral direction of the base body, wherein the annularly constructed base body has a first side surface and a second side surface constructed spaced apart in the axial direction of the base body, a plurality of first fan wheel blades spaced apart from each other in the peripheral direction of the base body are arranged on the first side surface, and a plurality of second fan wheel blades spaced apart from each other in the peripheral direction of the base body are arranged on the second side surface.

[0007] In other words, one aspect of the present invention is to provide a fan wheel for a rotor of an electric machine, the fan wheel having a base body of an annular structure. The base body has a first side and a second side of the structure spaced apart in the axial direction of the base body. In addition, at least one suction opening is formed in the base body, the at least one suction opening extending between the first side and the second side, so that the volume flow of the cooling medium can be guided through the suction opening. The base body usually has a plurality of suction openings, preferably the number of suction openings is an even number.

[0008] Adjacent to the suction opening or the edge of the suction opening, the air turning area is constructed on the first side of the substrate. The air turning area is therefore adjacent to the suction opening or the edge of the suction opening along the peripheral direction of the substrate. The air turning area is established and / or constructed to change the direction of the volume flow. Preferably, the air turning area has a ramp-shaped and / or arc-shaped design so that the volume flow can be turned from the axial direction about the longitudinal direction of the substrate to the radial direction of the substrate. In this way, the volume flow and / or air flow can be preferably directed to the winding head of the stator in a targeted manner to cool it.

[0009] On a first side of the base body, the fan wheel has first fan wheel blades. In addition, the base body has second fan wheel blades on a second side of the base body. The air flow projected onto the winding head of the stator can be concentrated or effectively utilized via the fan wheel blades arranged on both sides to increase the cooling effect.

[0010] An advantageous improvement of the invention is that the base body has a first inner section, a first outer section and a first middle section arranged between the first inner section and the first outer section on a first side, the respective sections being constructed in a circumferential manner in the peripheral direction, the first fan wheel blades being arranged in the first outer section, and the intake opening and the air deflection region being constructed in the first inner section. In other words, the base body has three sections on a first side with respect to its radial direction: a first inner section with the intake opening and the air deflection region, a first outer section with the first fan wheel blades, and a first middle section in which neither the intake opening nor the fan wheel blades are arranged. The first fan wheel blades are therefore arranged in the outer region with respect to the radial direction of the base body so that the volume flow and / or the air flow can be directed in a targeted manner onto the winding head of the stator.

[0011] In a preferred embodiment of the invention, it is provided that a second inner section, a second outer section and a second intermediate section arranged between the second inner section and the second outer section are formed on the second side, wherein the respective sections are formed circumferentially, the second fan wheel is arranged in the second outer section, and the intake opening is formed in the second inner section. The second fan wheel blades are thus arranged in the outer region with respect to the radial direction of the base body, so that the volume flow and / or the air flow can be directed in a targeted manner onto the winding head of the stator.

[0012] In connection with this, an advantageous improvement of the present invention is provided as follows: the second middle section is configured to be retracted relative to the second outer section in the axial direction of the base body. In other words, the second outer section protrudes relative to the middle section in the axial direction of the base body. The second fan wheel blade is arranged on the protruding section.

[0013] The transition between the second middle section and the second outer section can be designed to be trapezoidal or ramp-shaped. The ramp-shaped transition can have fluidic advantages for blowing out the volume flow and / or air flow via the second middle section and the second outer section in the radial direction of the base body.

[0014] In principle, it is conceivable that the first fan wheel blade and the second fan wheel blade are constructed identically. A preferred design of the present invention is that the first fan wheel blade and / or the second fan wheel blade are constructed differently from each other. The first fan wheel blade can preferably be constructed and / or arranged in such a way that the first fan wheel blade can specifically suck in a volume flow and / or a partial volume flow, while the second fan wheel blade accelerates and / or deflects the volume flow and / or the partial volume flow in the radial direction of the base body.

[0015] According to a preferred improvement of the invention, it is provided that the first fan wheel blades have a curved and / or arcuate course. Each first fan wheel blade thus has a starting point and an end point, wherein the starting point and the end point are spaced apart from one another in the radial direction and in the peripheral direction, and the course between the starting point and the end point is configured to be curved and / or arcuate. Such a design of the fan wheel blades is preferably suitable for the intake of air flows and / or volume flows.

[0016] An advantageous design of the present invention is that the second fan wheel blade has a linear design along the radial direction of the base body. In this way, the second fan wheel blade can blow out and / or turn the air flow and / or volume flow in a targeted manner along the radial direction of the base body.

[0017] It is conceivable to construct the fan wheel in multiple parts. Thus, the fan wheel can include a plurality of segments which are assembled to form a fan wheel of annular configuration.

[0018] A preferred design of the present invention is that the fan wheel is constructed in one piece. Therefore, the first fan wheel blade and the second fan wheel blade are inseparable from the annularly constructed base body. It is conceivable that the fan wheel is constructed of only one material or of a composite material. The fan wheel is preferably constructed of metal and / or of a synthetic material. It is also conceivable that the fan wheel can be constructed of a fiber-reinforced synthetic material.

[0019] In an advantageous improvement of the invention, the fan wheel has a plurality of suction openings arranged spaced apart from each other in the peripheral direction, wherein an air deflection region is respectively constructed between the suction openings. The number of suction openings is preferably an even number. The number X of suction openings is, for example, X=2, 4, 6 or 8. It is also conceivable that the number X is greater than 8.

[0020] The present invention also relates to an electric motor for a motor vehicle, comprising: a rotor rotatable about a rotor axis, the rotor having a laminated core, the laminated core having a first end side and a second end side arranged at intervals in the axial direction of the rotor; a first cooling channel and a second cooling channel different from the first cooling channel, wherein the first cooling channel and the second cooling channel extend within the laminated core between the first end side and the second end side; two fan wheels according to the present invention, which are arranged and / or constructed so that a cooling medium can flow through the rotor in a convective manner.

[0021] In other words, the motor has a rotor. The rotor includes a first end side and a second end side arranged spaced apart in the axial direction of the rotor. A first cooling channel and a second cooling channel different from the first cooling channel extend between the first end side and the second end side. The first cooling channel and the second cooling channel can run parallel to the longitudinal axis of the rotor and connect the first end side and the second end side to each other in the shortest distance. However, it is also conceivable that the first cooling channel and the second cooling channel run through the rotor in a spiral shape and connect the first end side and the second end side.

[0022] The first fan wheel is arranged adjacent to and / or sleeved on the first end side. Similarly, the second fan wheel is arranged adjacent to and / or sleeved on the second end side, wherein the first fan wheel and the second fan wheel are arranged offset from each other on the respective end sides of the rotor so that a cooling medium and / or a volume flow can flow through the rotor in a convective manner. The cooling medium is preferably air.

[0023] An advantageous improvement of the present invention is that the first side of the fan wheel faces the first end side of the rotor, the suction opening of the first fan wheel is aligned with the first cooling channel, the air deflection area of ​​the first fan wheel is aligned with the second cooling channel, the first side of the second fan wheel faces the second end side of the rotor, the suction opening of the second fan wheel is aligned with the second cooling channel, and the air deflection area of ​​the second fan wheel is aligned with the first cooling channel. Therefore, the first fan wheel and the second fan wheel are arranged offset from each other, so that the coolant and / or volume flow can flow through the rotor in a convective manner when the rotor rotates about its longitudinal axis.

[0024] In a preferred development of the invention, it is provided that the rotor is surrounded by the stator in the circumferential direction, wherein the rotor is arranged and / or constructed so as to be rotatable relative to the stator about its longitudinal axis, the rotor and the stator are surrounded by a housing, a floating bearing side hollow space and a fixed bearing side hollow space are constructed in the housing, the floating bearing side hollow space and the fixed bearing side hollow space are separated from each other by the rotor and the stator, the rotor can be convectively flowed through by a cooling medium flowing between the floating bearing side hollow space and the fixed bearing side hollow space, a first volume flow is constructed in the floating bearing side hollow space and a second volume flow is constructed in the fixed bearing side hollow space by rotation of the rotor about its longitudinal axis,

[0025] - a first part of the second volume flow can be sucked in through the first fan wheel blades of the first fan wheel via the intake opening of the second fan wheel, can be guided through the second cooling channel and can be blown out in the radial direction of the rotor via the air deflection region of the first fan wheel for cooling the winding heads of the stator surrounding the rotor in the hollow space on the floating bearing side,

[0026] - a second part of the second air flow can be deflected in radial direction via second fan wheel blades of the second fan wheel in order to cool the winding heads of the stator in the hollow space on the fixed bearing side,

[0027] - a first part of the first volume flow can be sucked in by the first fan wheel blades of the second fan wheel via the intake opening of the first fan wheel, can be guided through the first cooling channel and can be blown out via the air deflection region of the second fan wheel in the radial direction of the rotor for cooling the winding heads of the stator in the hollow space on the fixed bearing side,

[0028] A second part of the first volume flow can be deflected via the second fan wheel blades of the first fan wheel in order to cool the winding heads of the stator in the hollow space on the floating bearing side.

[0029] It is therefore provided that the winding heads of the stator in the hollow space on the floating bearing side of the electric machine are cooled on the one hand via a first part of a first volume flow from the hollow space on the fixed bearing side, which is sucked in via the first fan wheel blades of the first fan wheel, and on the other hand via a second part of a second volume flow from the hollow space on the floating bearing side. The winding heads of the stator in the hollow space on the fixed bearing side of the electric machine are cooled on the one hand via a first part of a second volume flow from the hollow space on the floating bearing side, which is sucked in via the first fan wheel blades of the second fan wheel, and on the other hand via a second part of the first volume flow from the hollow space on the fixed bearing side. In this way, the volume flow can be directed in a targeted manner to the winding heads of the stator surrounding the rotor in the circumferential direction in order to cool them effectively. In this way, the efficiency of the electric machine can be increased.

[0030] A preferred development of the invention is that the housing has a liquid-cooled floating bearing-side bearing shield and / or a liquid-cooled fixed bearing-side bearing shield, and the first volume flow can be guided at least in sections through the floating bearing-side bearing shield and the second volume flow can be guided at least in sections through the fixed bearing-side bearing shield. This allows the volume flow and / or the air flow to be effectively cooled before it is redirected to cool the winding head of the stator.

[0031] Finally, a preferred development of the invention is that the inner side of the bearing cap on the floating bearing side and / or the bearing cap on the fixed bearing side, which faces the rotor, is at least partially conical, so that the corresponding inner side is designed to taper in the direction of the rotor. In this way, the first volume flow and / or the second volume flow can be directed in a targeted manner in the direction of the fan wheel. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Other features are derived from the dependent claims and the following embodiments. The embodiments should not be understood as limiting, but rather as illustrative. These embodiments should enable those skilled in the art to implement the invention. The applicant reserves the right to use one or more of the disclosed features in the embodiments as a technical solution for a patent claim or to incorporate these features into an existing patent claim.

[0033] The embodiments are described in detail with the aid of the accompanying drawings.

[0034] Figure 1 showing a view of a first side of a fan wheel;

[0035] Figure 2 showing a view of a second side of the fan wheel;

[0036] Figure 3 A section through the electric machine is shown. DETAILED DESCRIPTION

[0037] Figure 1 The fan wheel 10 is shown for a rotor 12 of an electric machine 14. The fan wheel 10 has an annular base body 16. The base body 16 comprises a first side surface 18 and a second side surface 20 which is spaced apart from the first side surface 18 in the axial direction of the base body 16.

[0038] The first side surface 18 has a first inner section 22, a first outer section 24 and a first middle section 26 arranged between the first inner section 22 and the first outer section 24. The respective sections 22, 24, 26 are designed to be circumferential in the circumferential direction.

[0039] A plurality of inlet openings 28 are formed in the first inner section 22 of the first side surface 18. These inlet openings are arranged at regular intervals from each other along the peripheral direction of the base body 16. In the present embodiment, four inlet openings 28 are provided. However, it is conceivable that the number of inlet openings 28 is greater than or less than four. The number of inlet openings 28 is in particular an even number. The inlet openings 28 extend between the first side surface 18 and the second side surface 20 of the base body 16 so that a volume flow of a cooling medium, in particular air, can be guided through the inlet openings 28.

[0040] An air deflection region 30 is arranged and / or constructed between each of the two intake openings 28. The air deflection region 30 is set up and / or constructed to change the direction of the volume flow and / or the air flow. The air deflection region 30 has a ramp-shaped and / or curved design so that the volume flow can be deflected from the axial direction with respect to the longitudinal direction of the base body 16 to the radial direction of the base body 16. In this way, the volume flow and / or the air flow can preferably be directed in a targeted manner to the winding head 32 of the stator 34 surrounding the rotor 12 in order to cool it.

[0041] In the first outer section 24 of the first side surface 18, a plurality of first fan wheel blades 36 are arranged spaced apart from each other in the peripheral direction. The first fan wheel blades 36 have a curved and / or arcuate course. In other words, the fan wheel blades 36 have a starting point 40 and an end point 42, wherein the starting point 40 and the end point 42 are spaced apart from each other in the radial direction of the base body 16 and in the peripheral direction of the base body 16, and the course between the starting point 40 and the end point 42 is configured to be curved and / or arcuate. Such a design of the fan wheel blades 36 is preferably suitable for the intake of air flow and / or volume flow.

[0042] Figure 2 The second side 20 of the fan wheel 10 is shown. The second side 20 has a second inner section 44, a second outer section 46 and a second middle section 48 arranged between the second inner section 44 and the second outer section 46. The respective sections 44, 46, 48 are designed to be circumferential in the circumferential direction.

[0043] In the second inner section 44, intake openings 28 are formed, which extend between the first side surface 18 and the second side surface 20. In the second outer section 46, a plurality of second fan wheel blades 50 are arranged, which are spaced apart from one another in the peripheral direction of the base body 16. The second fan wheel blades 50 have a linear design in the radial direction of the base body 16. In this way, they can blow out air flows and / or volume flows in a targeted manner in the radial direction of the base body 16.

[0044] Furthermore, it can be seen that the second middle section 48 and the second inner section 44 are configured to be set back relative to the second outer section 46 in the axial direction of the base body 16 .

[0045] Figure 3 A schematic longitudinal section through an electric machine 14 is shown. The electric machine 14 has a rotor 12, wherein the rotor 12 is mounted rotatably about its longitudinal axis or rotor axis 52. The rotor 12 has a laminated core having a first end face 54 and a second end face 56 arranged at a distance from the first end face 54 in the axial direction of the rotor 12.

[0046] A plurality of first cooling channels 58 and a plurality of second cooling channels 60 run within the laminated core between the first end side 54 and the second end side 56 , wherein only one first cooling channel 58 and one second cooling channel 60 are respectively visible in the present section.

[0047] The first fan wheel 10a is arranged on the first end side 54. And the second fan wheel 10b is arranged on the second end side 56. The first fan wheel 10a and the second fan wheel 10b have the fan wheel 10 as shown in FIG. Figure 1 and 2 The first fan wheel 10a and the second fan wheel 10b are arranged on the rotor 12 such that a coolant, in particular a volume flow V and / or an air flow, can flow through the rotor 12 in a convective manner when the rotor 12 rotates about its longitudinal axis or rotor axis 52 .

[0048] In particular, the first side 18 of the first fan wheel 10a faces the first end side 54 of the rotor 12, wherein the intake opening 28 of the first fan wheel 10a is aligned with the first cooling channel 58 and the air deflection region 30 of the first fan wheel 10a is aligned with the second cooling channel 60. The second fan wheel 10b is arranged on the second side 20 in a correspondingly offset manner. The first side 18 of the second fan wheel 10b thus faces the second end side 56 of the rotor 12, wherein the intake opening 28 of the second fan wheel 10b is aligned with the second cooling channel 60 and the air deflection region 30 of the second fan wheel 10b is aligned with the first cooling channel 58. As a result, the first fan wheel 10a and the second fan wheel 10b are arranged offset to each other in such a way that a coolant and / or a volume flow V can flow through the rotor 12 in a convective manner when the rotor 12 rotates about its longitudinal axis 52.

[0049] The rotor 12 is surrounded by the stator 34 in the circumferential direction, wherein the rotor 12 is designed to be rotatable relative to the stator 34 about the rotor axis 52. The rotor 12 and the stator 34 are surrounded by a housing 62. A floating bearing side hollow space 64 and a fixed bearing side hollow space 66 are formed in the housing 62, and the floating bearing side hollow space and the fixed bearing side hollow space are separated from each other by the rotor 12 and the stator 34. The rotor 12 can be convectively flowed through by a cooling medium, in particular a volume flow or an air flow, flowing between the floating bearing side hollow space 64 and the fixed bearing side hollow space 66.

[0050] By the rotation of the rotor 12 about its rotor axis 52, a first volume flow V1 is formed in the floating bearing side hollow space 64 and a second volume flow V2 is formed in the fixed bearing side hollow space 66. Here, a first part V2a of the second volume flow V2 is sucked in through the fan wheel blades 36 of the first fan wheel 10a via the intake opening 28 of the second fan wheel 10b, guided through the second cooling channel 60, and blown out via the air deflection area 30 of the first fan wheel 10a in the radial direction of the rotor 12 or the base body 16 to cool the winding head 32 of the stator 34 of the rotor 12 in the floating bearing side hollow space 64. A second part V2b of the second air flow V2 is deflected in the radial direction of the rotor 12 or the base body 16 via the second fan wheel blades 50 of the second fan wheel 10b to cool the winding head 32 of the stator 34 in the fixed bearing side hollow space 66. Correspondingly, a first part V1a of the first volume flow V1 is sucked in through the first fan wheel blades 36 of the second fan wheel 10b via the intake opening 28 of the first fan wheel 10a, guided through the first cooling channel 58, and blown out via the air deflection area 30 of the second fan wheel 10b in the radial direction of the rotor 12 or the base body 16 to cool the winding head 32 of the stator 34 in the fixed bearing-side hollow space 66. In addition, a second part V1b of the first volume flow V1 is deflected in the radial direction via the fan wheel blades 50 of the first fan wheel 10a to cool the winding head 32 of the stator 34 in the floating bearing-side hollow space 64.

[0051] Targeted and efficient cooling of the winding head 32 can be achieved by the fan wheel blades 36 , 50 arranged on both sides of the fan wheel 10 . In this way, the efficiency of the electric machine 14 can be increased.

[0052] The housing 62 has a liquid-cooled floating bearing-side bearing shield 68 and a liquid-cooled fixed bearing-side bearing shield 70, wherein a first volume flow V1 is at least sectionally conducted through the floating bearing-side bearing shield 68 and a second volume flow V2 is at least sectionally conducted through the fixed bearing-side bearing shield 70. As a result, the volume flows V1, V2 can be effectively cooled before they are redirected to cool the winding head 32 of the stator 34.

[0053] The inner side 72 of the bearing cap 68 on the floating bearing side and the inner side 74 of the bearing cap 70 on the fixed bearing side facing the rotor 12 are at least sectionally conical, so that the respective inner side 72, 74 is designed to run in the direction of the rotor 12. In this way, the first volume flow V1 and / or the second volume flow V2 can be directed in a targeted manner in the direction of the respective fan wheel 10.

Claims

1. A fan wheel (10) for an electric motor (14) of a motor vehicle, comprising a main body (16) of an annular configuration, the main body having at least one intake opening (28) and an air deflection region (30), the air deflection region being configured adjacent to the intake opening (28) in the peripheral direction of the main body (16), wherein: The annular base body (16) has a first side surface (18) and a second side surface (20) spaced apart from the first side surface (18) in an axial direction of the base body (16). A plurality of first fan wheel blades (36) are arranged on the first side surface (18) and are spaced apart from each other along the peripheral direction of the base body (16), and A plurality of second fan wheel blades (50) are arranged on the second side surface (20) and are spaced apart from each other in a peripheral direction of the base body (16). It is characterized in that A second inner section (44), a second outer section (46), and a second middle section (48) arranged between the second inner section (44) and the second outer section (46) are formed on the second side surface (20), the second middle section (48) being configured to be recessed relative to the second outer section (46) in the axial direction of the base body (16), and a transition between the second middle section and the second outer section being configured to be trapezoidal or ramp-shaped, The corresponding sections (44, 46, 48) are constructed in a surrounding manner along the circumferential direction. The second fan wheel blades (50) are arranged in the second outer section (46), and The intake opening (28) is formed in the second inner section (44).

2. The fan wheel according to claim 1, characterized in that The base body (16) has, on the first side (18), a first inner section (22), a first outer section (24), and a first intermediate section (26) arranged between the first inner section (22) and the first outer section (24), The corresponding sections (22, 24, 26) are constructed in a surrounding manner along the circumferential direction. The first fan wheel blades (36) are arranged in the first outer section (24), and The intake opening (28) and the air deflection region (30) are formed in the first inner section (22).

3. The fan wheel according to claim 1 or 2, characterized in that: The first fan wheel blade (36) and / or the second fan wheel blade (50) are designed differently from one another.

4. The fan wheel according to claim 1 or 2, characterized in that: The first fan wheel blades (36) have a curved and / or arc-shaped course.

5. The fan wheel according to claim 1 or 2, characterized in that: The second fan wheel blade (50) has a straight-line design in the radial direction of the base body (16).

6. The fan wheel according to claim 1 or 2, characterized in that: The fan wheel (10) is designed in one piece.

7. The fan wheel according to claim 1 or 2, characterized in that: The fan wheel (10) is made of metal, plastic and / or of fiber-reinforced plastic.

8. The fan wheel according to claim 1 or 2, characterized in that: The fan wheel (10) has a plurality of intake openings (28) which are arranged spaced apart from one another in the circumferential direction, wherein the air deflection regions (30) are respectively formed between the intake openings (28).

9. An electric motor (14) for a motor vehicle, having A rotor (12) rotatable about a rotor axis (52), the rotor having a lamination stack, the lamination stack having a first end side (54) and a second end side (56) spaced apart in an axial direction of the rotor (12), A first cooling channel (58) and a second cooling channel (60) different from the first cooling channel (58), wherein The first cooling channel (58) and the second cooling channel (60) extend within the lamination stack between the first end side (54) and the second end side (56), Two fan wheels (10) according to any one of the preceding claims, which are arranged and / or designed in such a way that a coolant can flow through the rotor (12) in a convective manner.

10. The motor according to claim 9, characterized in that The first side surface (18) of the first fan wheel (10a) faces the first end side surface (54) of the rotor (12), the suction opening (28) of the first fan wheel (10a) is aligned with the first cooling channel (58), and The air deflection area (30) of the first fan wheel (10a) is aligned with the second cooling channel (60), The first side surface (18) of the second fan wheel (10b) faces the second end side surface (56) of the rotor (12), the suction opening (28) of the second fan wheel (10b) is aligned with the second cooling channel (60), and the air deflection area (30) of the second fan wheel (10b) is aligned with the first cooling channel (58).

11. The motor according to claim 9 or 10, characterized in that: The rotor (12) is surrounded by a stator (34) in a circumferential direction, wherein the rotor (12) is arranged and / or constructed to be rotatable relative to the stator (34) about a rotor axis (52), the rotor (12) and the stator (34) are surrounded by a housing (62), a floating bearing side hollow space (64) and a fixed bearing side hollow space (66) are constructed in the housing (62), the floating bearing side hollow space and the fixed bearing side hollow space are separated from each other by the rotor (12) and the stator (34), the rotor (12) can be convectively penetrated by a cooling medium flowing between the floating bearing side hollow space (64) and the fixed bearing side hollow space (66), and a first volume flow (V1) is constructed in the floating bearing side hollow space (64) and a second volume flow (V2) is constructed in the fixed bearing side hollow space (66) by rotation of the rotor (12) about the rotor axis (52), A first part (V2a) of the second volume flow (V2) can be sucked in through the first fan wheel blades (36) of the first fan wheel (10a) via the suction opening (28) of the second fan wheel (10b), can be guided through the second cooling channel (60), and can be blown out in the radial direction of the rotor (12) via the air deflection region (30) of the first fan wheel (10a) to cool a winding head (32) of a stator (34) surrounding the rotor (12) in the circumferential direction thereof in the hollow space (64) on the floating bearing side, A second part (V2b) of the second volume flow (V2) can be deflected via second fan wheel blades (50) of the second fan wheel (10b) in the radial direction of the base body (16) in order to cool the winding head (32) of the stator (34) in the fixed bearing-side hollow space (66), A first part (V1a) of the first volume flow (V1) can be sucked in through the first fan wheel blades (36) of the second fan wheel (10b) via the suction opening (28) of the first fan wheel (10a), can be guided through the first cooling channel (58), and can be blown out in the radial direction of the rotor (12) via the air deflection region (30) of the second fan wheel (10b) to cool the winding head (32) of the stator (34) in the hollow space (66) on the fixed bearing side, A second part (V1b) of the first volume flow (V1) can be deflected via second fan wheel blades (50) of the first fan wheel (10a) in the radial direction of the base body (16) in order to cool a winding head (32) of the stator (34) in the floating bearing-side hollow space (64).

12. The motor according to claim 11, characterized in that The housing (62) has a liquid-cooled floating bearing side bearing cover (68) and / or a liquid-cooled fixed bearing side bearing cover (70), and the first volume flow (V1) can be guided at least in sections through the floating bearing side bearing cover (68) and the second volume flow (V2) can be guided at least in sections through the fixed bearing side bearing cover (70).

13. The motor according to claim 12, characterized in that The inner sides (72, 74) of the floating bearing side bearing cover (68) and / or the fixed bearing side bearing cover (70) facing the rotor (12) are at least partially conically designed so that the respective inner side is designed to taper in the direction of the rotor (12).

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