An electrical machine comprising: a rotatable shaft body defining a longitudinal axis; a first internal fluid channel extending axially within the shaft body and including an inlet opening through the shaft body for fluid communication of external fluid into the first internal fluid channel and an outlet opening through the shaft body for fluid communication of fluid from the first internal fluid channel to an area external of the shaft body; and a second internal fluid channel extending axially within the shaft body and including an inlet opening through the shaft body for fluid communication of external fluid into the second internal fluid channel and an outlet opening through the shaft body for fluid communication of fluid from the second internal fluid channel to an area external of the shaft body, wherein the first and second internal fluid channels are in fluid isolation from one another within the shaft body, wherein the second internal fluid channel is configured for airflow through the shaft body; wherein, either a) the first internal fluid channel is configured for lubricant flow and the machine further comprises: an internal coolant channel extending axially within the shaft body and including an inlet opening through the shaft body for fluid communication of external coolant into the internal coolant channel and an outlet opening through the shaft body for fluid communication of coolant from the internal coolant channel to an area external of the shaft body, wherein the first and second internal fluid channels (114,124) and the internal coolant channel are in fluid isolation from one another within the shaft body; or b) the first internal fluid channel is configured for coolant flow and the machine further comprises: an internal lubricant channel extending axially within the shaft body and including an inlet opening through the shaft body for fluid communication of external lubricant into the internal lubricant channel and an outlet opening through the shaft body for fluid communication of lubricant from the internal lubricant channel to an area external of the shaft body, wherein the first and second internal fluid channels and the internal lubricant channel are in fluid isolation from one another within the shaft body. a rotatable shaft body defining a longitudinal axis; a first internal fluid channel extending axially within the shaft body and including an inlet opening through the shaft body for fluid communication of external fluid into the first internal fluid channel and an outlet opening through the shaft body for fluid communication of fluid from the first internal fluid channel to an area external of the shaft body; and a second internal fluid channel extending axially within the shaft body and including an inlet opening through the shaft body for fluid communication of external fluid into the second internal fluid channel and an outlet opening through the shaft body for fluid communication of fluid from the second internal fluid channel to an area external of the shaft body, wherein the first and second internal fluid channels are in fluid isolation from one another within the shaft body, wherein the second internal fluid channel is configured for airflow through the shaft body; wherein, either a) the first internal fluid channel is configured for lubricant flow and the machine further comprises: an internal coolant channel extending axially within the shaft body and including an inlet opening through the shaft body for fluid communication of external coolant into the internal coolant channel and an outlet opening through the shaft body for fluid communication of coolant from the internal coolant channel to an area external of the shaft body, wherein the first and second internal fluid channels (114,124) and the internal coolant channel are in fluid isolation from one another within the shaft body; or b) the first internal fluid channel is configured for coolant flow and the machine further comprises: an internal lubricant channel extending axially within the shaft body and including an inlet opening through the shaft body for fluid communication of external lubricant into the internal lubricant channel and an outlet opening through the shaft body for fluid communication of lubricant from the internal lubricant channel to an area external of the shaft body, wherein the first and second internal fluid channels and the internal lubricant channel are in fluid isolation from one another within the shaft body. an internal coolant channel extending axially within the shaft body and including an inlet opening through the shaft body for fluid communication of external coolant into the internal coolant channel and an outlet opening through the shaft body for fluid communication of coolant from the internal coolant channel to an area external of the shaft body, wherein the first and second internal fluid channels (114,124) and the internal coolant channel are in fluid isolation from one another within the shaft body; or b) the first internal fluid channel is configured for coolant flow and the machine further comprises: an internal lubricant channel extending axially within the shaft body and including an inlet opening through the shaft body for fluid communication of external lubricant into the internal lubricant channel and an outlet opening through the shaft body for fluid communication of lubricant from the internal lubricant channel to an area external of the shaft body, wherein the first and second internal fluid channels and the internal lubricant channel are in fluid isolation from one another within the shaft body.