STATOR FOR AN ELECTRICAL MACHINE, HAVING A DEVICE FOR COOLING THE STATOR
A stator for an electric machine includes a laminated stator core and stator windings, which are designed for generating an electrical rotating field in an current-carrying state, and has a device for cooling the stator with a cooling liquid. The device includes a hollow-cylindrical stator jacket which surrounds the laminated stator core and the stator windings and has a radial inlet, formed on the internal side of the stator jacket being helically extending protrusions which conjointly with the external side of the laminated stator core form ducts for the cooling liquid. The stator may be implemented in an electric machine, and a vehicle may implement such electric machine.
1 . A stator for an electric machine, having a laminated stator core and stator windings, which are designed for generating an electrical rotating field in an current-carrying state, and having a device for cooling the stator with a cooling liquid, characterized in that the device comprises a hollow-cylindrical stator jacket which surrounds the laminated stator core and the stator windings and has a radial inlet, formed on the internal side of the stator jacket being helically extending protrusions which conjointly with the external side of the laminated stator core form ducts for the cooling liquid.
2 . The stator as claimed in claim 1 , wherein the inlet for the cooling liquid in terms of the axial direction is disposed at least approximately in the center of the stator jacket, and the helical ducts for the cooling liquid extend from the inlet ( 9 ) to both axial ends of the stator jacket.
3 . The stator as claimed in claim 1 , wherein the stator jacket has a first half-shell and connected thereto a second half-shell.
4 . The stator as claimed in claim 3 , wherein the two half-shells are welded and/or adhesively bonded and/or latched to one another.
5 . The stator as claimed in claim 3 , or wherein interconnected edges of the half-shells define a separating plane in which the first half-shell has one or a plurality of recesses and the second half-shell has one or a plurality of protrusions which are formed so as to be complementary to the recesses and are inserted into the recesses and/or latched thereto.
6 . The stator as claimed in claim 3 , wherein the two half-shells are produced from a plastics material.
7 . The stator as claimed in claim 3 , wherein the two half-shells are produced by injection molding.
8 . The stator as claimed in claim 1 , wherein disposed on one axial side or on both axial sides of the stator is in each case one ring having passage openings in order to supply coolant from the ducts to winding heads of the stator windings.
9 . A method for producing a stator for an electric machine as claimed in claim 1 , comprising the following method steps:
providing a laminated stator core having stator windings
disposing a first half-shell and a second half-shell of a stator jacket around the laminated stator core and
connecting the first half-shell and the second half-shell in order to form the hollow-cylindrical stator jacket.
10 . An electric machine having a stator as claimed in claim 1 , which surrounds a rotor that is rotatable relative to the stator.
11 . The electric machine as claimed in claim 10 , wherein the cooling liquid comprises an oil.
12 . The electric machine as claimed in claim 10 , having a flange having a plurality of passage openings for fastening the electric machine, wherein the inlet for the cooling liquid of the stator jacket is disposed in the circumferential direction so as to be adjacent to one of the passage openings.
13 . The electric machine as claimed in claim 12 , wherein the inlet is co-aligned in the axial direction with the passage opening.
14 . A vehicle having an electric machine as claimed in claim 10 , which is configured for driving the vehicle.
15 . The stator as claimed in claim 2 , wherein the stator jacket has a first half-shell and connected thereto a second half-shell.
16 . The stator as claimed in claim 4 , wherein interconnected edges of the half-shells define a separating plane in which the first half-shell has one or a plurality of recesses and the second half-shell has one or a plurality of protrusions which are formed so as to be complementary to the recesses and are inserted into the recesses and/or latched thereto.
17 . The stator as claimed in claim 4 , wherein the two half-shells are produced from a plastics material.
18 . The stator as claimed in claim 4 , wherein the two half-shells are produced by injection molding.
19 . The stator as claimed in claim 2 , wherein disposed on one axial side or on both axial sides of the stator is in each case one ring having passage openings in order to supply coolant from the ducts to winding heads of the stator windings.
20 . A method for producing a stator for an electric machine as claimed in claim 2 , comprising the following method steps:
providing a laminated stator core having stator windings;
disposing a first half-shell and a second half-shell of a stator jacket around the laminated stator core; and
connecting the first half-shell and the second half-shell in order to form the hollow-cylindrical stator jacket.