Stator heat transfer feature

Abstract

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.