Electrical machine comprising cooling channels
The invention relates to an electric motor, in particular for a motor vehicle, comprising a housing ( 9 ), a shaft ( 8 ) having an axle ( 30 ), a stator and a rotor, at least one channel ( 11 ) for conducting a coolant for cooling the electric motor ( 5 ), wherein the geometry of the alignment of at least one section ( 12 ) of the at least one channel ( 11 ) is designed such that the coolant flows in the direction of the axle ( 30 ) of the shaft ( 8 ) through the at least one channel ( 11 ), having a deviation of less than 40°.
1. An electrical machine ( 5 ), comprising:
a housing ( 9 ),
a shaft ( 8 ) having an axis ( 30 ),
a stator ( 6 ) and a rotor ( 7 ), and
at least one channel ( 11 ) for conducting a cooling fluid for cooling the electrical machine ( 5 ), characterized in that the at least one channel ( 11 ) includes an inlet opening ( 36 ) and an outlet opening ( 37 ), both of which are arranged in the region of a central plane ( 29 ) of one of the electrical machine ( 5 ) and a component ( 27 ) of the electrical machine ( 5 ), said central plane ( 29 ) being perpendicular to the axis ( 30 ), and further characterized in that the at least one channel ( 11 ) defines a meandering path that includes:
a first pair of sections ( 15 , 16 ) which diverge from the inlet opening ( 36 ) and extend in opposite axial directions to direct a pair of separate component streams of cooling fluid away from the central plane ( 29 ),
a second pair of sections ( 17 , 18 ) extending from the first pair of sections ( 15 , 16 ) and converging in opposite axial directions to a connecting section ( 35 ) arranged in the region of the central plane ( 29 ), in order to mix the pair of separate component streams of cooling fluid together, and
a third pair of sections ( 15 , 16 ) extending from the second pair of sections ( 17 , 18 ) and diverging from the connecting section ( 35 ) to extend in opposite axial directions to direct a pair of separate component streams of cooling fluid away from the central plane ( 29 ).
2. The electrical machine as claimed in claim 1 , characterized in that the first pair of sections ( 15 , 16 ) are arranged to direct the cooling fluid to a pair of opposite axial end faces ( 26 ) of the electrical machine ( 5 ).
3. The electrical machine as claimed in claim 1 , characterized in that the meandering path further includes two curve sections ( 31 ), each one of which turns the cooling fluid from one of the first pair of sections ( 15 , 16 ) to one of the second pair of sections ( 17 , 18 ).
4. The electrical machine as claimed in claim 3 , further comprising a separating crosspiece ( 34 ) arranged between the first pair of sections ( 15 , 16 ) and the second pair of sections ( 17 , 18 ), and at least partially defining the two curve sections ( 31 ).
5. A drive device ( 1 ), comprising:
an internal combustion engine ( 4 ), and
at least one electrical machine ( 5 ) as claimed in claim 1 .
6. The electrical machine as claimed in claim 1 , characterized in that the at least one channel ( 11 ) is formed in the housing ( 9 ).
7. The electrical machine as claimed in claim 1 , characterized in that the at least one channel ( 11 ) is formed in the stator ( 6 ).
8. The electrical machine as claimed in claim 1 , characterized in that the cooling fluid is a liquid.
9. The electrical machine as claimed in claim 1 , characterized in that the cooling fluid is an oil.
10. The electrical machine as claimed in claim 1 , characterized in that the cooling fluid is a water/glycol mixture.
11. The electrical machine as claimed in claim 1 , characterized in that the meandering path further includes additional alternating pairs of converging and diverging sections extending about a circumference of the electrical machine, the meandering path terminating in a pair of sections converging to the outlet opening ( 37 ).