Electrical machine with rotor shaft cooling channels

1 . An electrical machine comprising:

a stator;

a rotor spaced apart radially from the stator, wherein the rotor is configured to rotate about a longitudinal axis, and wherein the rotor comprises a rotor shaft having a first end face, a second end face, and a surface;

a shaped part having integrated fluid channels within the shaped part extending between a first end of the shaped part and a second end of the shaped part, wherein the shaped part is configured to be non-rotating; and

a gap extending between the rotor and the stator,

wherein permanent magnets are connected to the rotor shaft and adjoin the gap,

wherein the rotor shaft has, spaced apart radially from the gap, cooling channels extending in a longitudinal direction of the rotor shaft between the first end face and the second end face of the rotor shaft,

wherein the shaped part is positioned upstream and adjacent to the first end face of the rotor shaft along the longitudinal direction such that an entirety of each integrated fluid channel of the integrated fluid channels within the shaped part is positioned upstream of the first end face and the cooling channels of the rotor shaft, and

wherein the shaped part is configured to provide fluid flow to the cooling channels of the rotor shaft at the first end face via the integrated fluid channels of the shaped part.

2 . The electrical machine of claim 1 , wherein the cooling channels are configured as elongate bores in the rotor shaft, which extend, spaced apart radially from the surface of the rotor shaft, between the first end face and the second end face of the rotor shaft.

3 . The electrical machine of claim 1 , wherein the cooling channels are configured as elongate depressions in the surface of the rotor shaft.

4 . The electrical machine of claim 1 , wherein the permanent magnets adjoin the surface of the rotor shaft directly.

5 . The electrical machine of claim 1 , further comprising:

an intermediate layer of non-conducting material extending between the surface of the rotor shaft and the permanent magnets,

wherein the intermediate layer is configured to fasten the permanent magnets.

6 . The electrical machine of claim 5 , wherein the cooling channels are configured as elongate depressions in the surface of the rotor shaft, and

wherein the elongate depressions are formed radially internally relative to the intermediate layer.

7 . The electrical machine of claim 1 , further comprising:

a compressor stage spaced apart axially from the rotor shaft,

wherein the compressor stage is configured to provide the fluid flow through the cooling channels, and

wherein the compressor stage comprises an impeller and a stator.

8 . The electrical machine of claim 7 , wherein the integrated fluid channels of the shaped part are associated on an inlet side with the impeller and on an outlet side with the cooling channels.

9 . The electrical machine of claim 7 , further comprising:

a further shaped part arranged upstream of the impeller,

wherein the further shaped part comprises integrated fluid channels by way of which a cooling fluid is supplied in a defined direction to the impeller.

10 . The electrical machine of claim 1 , further comprising:

a port configured to provide a pressurized fluid and guide the pressurized fluid through the cooling channels.

11 . The electrical machine of claim 10 , wherein the integrated fluid channels of the shaped part are associated on an inlet side with the port for providing the pressurized fluid and on an outlet side with the cooling channels.

12 . The electrical machine of claim 1 , wherein the electrical machine is arranged in a housing having a plurality of axially spaced apart end plates in which the rotor shaft is mounted, and

wherein one end plate of the plurality of axially spaced apart end plates has at least one fluid inlet configured to provide fluid flow to the integrated fluid channels of the shaped part and the other end plates of the plurality of axially spaced apart end plates has at least one fluid outlet.

13 . The electrical machine of claim 12 , further comprising:

a compressor stage spaced apart axially from the rotor shaft,

wherein the compressor stage is configured to provide the fluid flow through the cooling channels,

wherein the compressor stage comprises an impeller and a stator, and

wherein the compressor stage is arranged inside the housing.

14 . The electrical machine of claim 13 , wherein the compressor stage is connected on an inlet side with the at least one fluid inlet of the one end plate.

15 . The electrical machine of claim 12 , further comprising:

a port configured to provide a pressurized fluid and guide the pressurized fluid through the cooling channels,

wherein the fluid inlet forms the port for providing the pressurized fluid.

16 . The electrical machine of claim 1 , wherein the cooling channels run linearly between the first end face and the second end face of the rotor shaft.

17 . The electrical machine of claim 1 , wherein the cooling channels are aerodynamically shaped adjacent to the first end face and/or the second end face.

18 . The electrical machine of claim 1 , wherein the permanent magnets of the rotor are surrounded and radially fixed by a bandage.

19 . An electrical machine comprising:

a stator;

a rotor spaced apart radially from the stator, wherein the rotor is configured to rotate about a longitudinal axis, and wherein the rotor comprises a rotor shaft having a first end face, a second end face, and a surface;

a shaped part having integrated fluid channels within the shaped part, wherein the shaped part is configured to be non-rotating;

a gap extending between the rotor and the stator; and

an auxiliary plate arranged on the first end face of the rotor shaft,

wherein permanent magnets are connected to the rotor shaft and adjoin the gap,

wherein the rotor shaft has, spaced apart radially from the gap, cooling channels extending in a longitudinal direction of the rotor shaft between the first end face and the second end face of the rotor shaft,

wherein the shaped part is positioned adjacent to the first end face of the rotor shaft along the longitudinal direction,

wherein the shaped part is configured to provide fluid flow to the cooling channels of the rotor shaft at the first end face,

wherein the auxiliary plate is positioned between the shaped part and the first end face of the rotor shaft along the longitudinal direction, and

wherein the auxiliary plate has fluid channels configured receive the fluid flow from the integrated fluid channels of the shaped part and distribute the fluid flow to the cooling channels of the rotor shaft along the longitudinal direction.

20 . The electric machine of claim 19 , wherein the fluid channels of the auxiliary plate are aerodynamically curved fluid channels by which a cooling fluid is configured to be deflected in a circumferential direction such that the cooling fluid acquires a directional component in a direction of rotation of the rotor shaft.