US 12,407,223 B2
Electric machine and method for operating said machine
Christian Koenen, Stuttgart (DE)
Assigned to DR. ING. H.C. F. PORSCHE AKTIENGESELLSCHAFT, Stuttgart (DE)
Filed by Dr. Ing. h.c. F. Porsche Aktiengesellschaft, Stuttgart (DE)
Filed on Nov. 17, 2022, as Appl. No. 18/056,270.
Claims priority of application No. 102021130471.7 (DE), filed on Nov. 22, 2021.
Prior Publication US 2023/0163665 A1, May 25, 2023
Int. Cl. H02K 9/08 (2006.01); H02K 1/20 (2006.01)
CPC H02K 9/08 (2013.01) [H02K 1/20 (2013.01); H02K 2209/00 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An electric machine, comprising:
a rotor comprising a rotor shaft and a rotor laminated core;
a stator comprising a stator laminated core with recesses and stator windings disposed in the recesses of the stator laminated core,
wherein coolant can flow through the recesses which accommodate the stator windings in such a way that the stator windings can be directly cooled by the coolant,
wherein channels are configured in the stator laminated core at a distance to the recesses which accommodate the stator windings through which coolant can flow in such a way that the stator windings can be indirectly cooled by the coolant flowing through the channels; and
a device via which a flow of coolant through the recesses which accommodate the stator windings and through the channels can be set depending on an operating point of the electric machine in such a way that, at first operating points, the coolant can be conducted only through the recesses which accommodate the stator windings and, at second operating points, the coolant can be conducted at least through the channels,
wherein:
the first operating points are operating points at which an actual torque of the electric machine at an actual speed of the electric machine is greater than a threshold value, and
the second operating points are operating points at which the actual torque of the electric machine at the actual speed of the electric machine is less than the threshold value.