STATOR HEAT TRANSFER FEATURE
A dynamoelectric machine includes a shaft, a rotor radially outward from the shaft with the rotor and shaft arranged to rotate in unison, a stator radially outward from the rotor with the stator being stationary relative to the rotor and shaft, and a heat transfer feature adjacent to and radially outward from the stator. The heat transfer feature includes a base encasing the stator and fins extending radially outward from the base with a configuration where the fins extend an axial length that is less than a total axial length of the base and/or extend at least partially in a circumferential direction.
1 . A dynamoelectric machine comprising:
a shaft;
a rotor radially outward from the shaft, the rotor and shaft arranged to rotate in unison;
a stator radially outward from the rotor, the stator being stationary relative to the rotor and shaft; and
a heat transfer feature adjacent to and radially outward from the stator, the heat transfer feature having a base encasing the stator and fins extending radially outward from the base with a configuration selected from a group consisting of i) the fins extend along an axial length that is less than a total axial length of the base, ii) the fins extend at least partially in a circumferential direction, and combinations of i) and ii).
2 . The dynamoelectric machine of claim 1 , further comprising:
a housing radially outward from the heat transfer feature.
3 . The dynamoelectric machine of claim 2 , further comprising:
a fluid inlet in the housing that allows a fluid to enter a gap between the heat transfer feature and the housing; and
a fluid outlet in the housing that allows the fluid to exit the gap.
4 . The dynamoelectric machine of claim 1 , further comprising:
a header that fluidically isolates the heat transfer feature and the housing from the shaft, the rotor, and the stator.
5 . The dynamoelectric machine of claim 1 , further comprising:
an interface layer between the stator and the heat transfer feature, the interface layer fluidically separating the stator from the heat transfer feature.
6 . The dynamoelectric machine of claim 1 , wherein the stator is a lamination stack.
7 . The dynamoelectric machine of claim 1 , further comprising:
a cooling lubricant adjacent to the heat transfer feature.
8 . The dynamoelectric machine of claim 7 , wherein the heat transfer feature fluidically isolates the stator from the cooling lubricant.
9 . The dynamoelectric machine of claim 1 , wherein each fin extends axially along the base for one-tenth or less of a total axial length of the base.
10 . The dynamoelectric machine of claim 1 , wherein each fin extends axially along the base in a wavy pattern.
11 . A stationary member in a dynamoelectric machine comprising:
a stator having an annular back iron and a plurality of teeth extending radially inward from the back iron;
a plurality of windings wrapped around each of the plurality of teeth;
a heat transfer feature on a radially outer side of the back iron, the heat transfer feature comprising:
a base adjacent the back iron;
fins extending radially outward from the base; and
a channel formed by the fins, the channel extending at least partially in an axial direction and partially in a circumferential direction.
12 . The stationary member of claim 11 , wherein at least one fin has a different amount of surface area than another fin.
13 . The stationary member of claim 11 , wherein axially adjacent fins are clocked in the axial direction to be circumferentially offset.
14 . The stationary member of claim 11 , wherein circumferentially adjacent fins extend parallel to one another at an angle at least partially in the axial direction and at least partially in the circumferential direction.
15 . The stationary member of claim 11 , wherein each fin extends axially along the base in a wavy pattern.