MOTOR COOLING FEATURES
A cooling system of an electric machine includes a rotor having a shaft, a hub mounted to the shaft, and a core mounted to the hub. A bearing assembly is secured to the shaft and has a rotating portion and a fixed portion including a fluid inlet. A plurality of nozzle features are fluidly connected to the fluid inlet via a manifold. A cooling system of an electric machine includes a rotor having a shaft and a hub mounted to the shaft, a fluid inlet having a rotating portion and having a fixed portion, a fluid manifold, and a plurality of nozzle features disposed in the hub and fluidly connected to the fluid inlet via the manifold. A method of cooling an electric machine includes spraying coolant from a plurality of hub nozzles onto end turns of a stator winding.
1 . A cooling system of an electric machine, comprising:
a rotor having a shaft, a hub mounted to the shaft, and a core mounted to the hub;
a bearing assembly secured to the shaft, the bearing assembly having a rotating portion and having a fixed portion including a fluid inlet;
a fluid manifold; and
a plurality of nozzle features fluidly connected to the fluid inlet via the manifold.
2 . The cooling system of claim 1 , wherein the fluid manifold is disposed in the rotating portion of the bearing assembly.
3 . The cooling system of claim 1 , wherein the fluid manifold is disposed in the hub.
4 . The cooling system of claim 1 , wherein the nozzle features are formed as a plurality of blocks each having at least one exposed nozzle surface having at least one fluid ejection bore.
5 . The cooling system of claim 4 , wherein at least one of the blocks includes a nozzle array having a manifold.
6 . The cooling system of claim 5 , wherein the hub comprises an axial coolant channel, the system further comprising a hub adapter for fluidly connecting the nozzle array manifold to the coolant channel.
7 . The cooling system of claim 4 , wherein the fluid manifold comprises a plurality of manifolds disposed in respective ones of the blocks.
8 . The cooling system of claim 4 , wherein at least one of the blocks comprises a nozzle slot and a nozzle insertable therein.
9 . The cooling system of claim 1 , further comprising a valve disposed in the bearing assembly for transferring coolant from the fixed portion to the rotating portion.
10 . The cooling system of claim 1 , wherein the hub includes longitudinal channels fluidly connected to the nozzle features.
11 . The cooling system of claim 1 , wherein the nozzle features are formed in the hub.
12 . A cooling system of an electric machine, comprising:
a rotor having a shaft and a hub mounted to the shaft;
a fluid inlet having a rotating portion and having a fixed portion;
a fluid manifold; and
a plurality of nozzle features disposed in the hub and fluidly connected to the fluid inlet via the manifold.
13 . The cooling system of claim 12 , wherein the nozzle features are formed as a plurality of blocks each having at least one exposed nozzle surface having at least one fluid ejection bore.
14 . The cooling system of claim 13 , wherein at least one of the blocks includes a nozzle array having a manifold.
15 . The cooling system of claim 14 , wherein the hub comprises an axial coolant channel, the system further comprising a hub adapter for fluidly connecting the nozzle array manifold to the coolant channel.
16 . The cooling system of claim 13 , wherein at least one of the blocks comprises a nozzle slot and a nozzle insertable therein.
17 . A method of cooling an electric machine, comprising spraying coolant from a plurality of hub nozzles onto end turns of a stator winding.
18 . The method of claim 17 , further comprising flowing the coolant through an axial channel of a shaft.
19 . The method of claim 17 , further comprising flowing the coolant through an axial channel of a hub.
20 . The method of claim 17 , wherein the flowing of coolant comprises urging the coolant through a plurality of axial hub channels.