ROTOR FOR AN ELECTRIC MACHINE HAVING A COOLING DUCT IN A POLE SEPARATOR
A rotor for an electric machine includes a rotor shaft and a laminated core which is arranged on the rotor shaft and formed from stacked electrical laminations and which has radially outwardly projecting laminated core protrusions. Rotor windings are each wound around a laminated core protrusion. A pole separator is arranged between two adjacent laminated core protrusions and has a cooling duct, which runs in the pole separator, for a coolant.
1 . A rotor for an electric machine, comprising:
a rotor shaft,
a laminated core, which is arranged on the rotor shaft and formed from stacked electrical laminations and which has radially outwardly projecting laminated core protrusions,
rotor windings, which are each wound around a laminated core protrusion, and
a pole separator which is arranged between two adjacent laminated core protrusions and in which a cooling duct for a coolant runs.
2 . The rotor as claimed in claim 1 , wherein the cooling duct extends from one axial side of the laminated core to the opposite axial side of the laminated core.
3 . The rotor as claimed in claim 1 , wherein the pole separator has an inner section, which is arranged between two adjacent rotor windings, and an outer section, which is arranged radially outside the two rotor windings.
4 . The rotor as claimed in claim 3 , wherein the inner section is embedded in a potting compound with which the two rotor windings are potted.
5 . The rotor as claimed in claim 3 , wherein the cooling duct runs in the inner section and/or the outer section.
6 . The rotor as claimed in claim 1 , wherein the cooling duct has a circular or Y-shaped cross section.
7 . The rotor as claimed in claim 1 , wherein the cooling duct opens in an end cap of the rotor.
8 . The rotor as claimed in claim 1 , wherein the pole separator has a plurality of cooling ducts corresponding to the cooling duct.
9 . The rotor as claimed in claim 1 , having a plurality of pole separators corresponding to the pole separator, which are each arranged between two adjacent laminated core protrusions of the laminated core.
10 . An electric machine, having a rotor as claimed in claim 1 and a stator surrounding the rotor.
11 . A vehicle having an electric machine as claimed in claim 10 , which is provided to drive the vehicle.
12 . A method for producing a rotor as claimed in claim 1 , having the following steps:
arranging the laminated core on the rotor shaft,
winding the rotor windings around the laminated core protrusions of the laminated core,
inserting the pole separator between two adjacent laminated core protrusions of the laminated core, and
potting the rotor windings with a potting compound, so that the pole separator is embedded in the potting compound.
13 . The method as claimed in claim 12 , wherein the rotor is positioned for the potting such that its axis of rotation runs vertically, and the potting compound is introduced through a filling opening in an end cap, wherein the end cap preferably also has a venting opening.
14 . The rotor as claimed in claim 2 , wherein the pole separator has an inner section, which is arranged between two adjacent rotor windings, and an outer section, which is arranged radially outside the two rotor windings.
15 . The rotor as claimed in claim 4 , wherein the cooling duct runs in the inner section and/or the outer section.
16 . The rotor as claimed in claim 2 , wherein the cooling duct has a circular or Y-shaped cross section.
17 . The rotor as claimed in claim 2 , wherein the cooling duct opens in an end cap of the rotor.
18 . The rotor as claimed in claim 2 , wherein the pole separator has a plurality of cooling ducts corresponding to the cooling duct.
19 . The rotor as claimed in claim 2 , having a plurality of pole separators corresponding to the pole separator, which are each arranged between two adjacent laminated core protrusions of the laminated core.
20 . An electric machine, having a rotor as claimed in claim 2 and a stator surrounding the rotor.