Thanks, Zach! The only way this makes sense to me is if there is some losses that aren't accounted for so I think you are probably correct. Another interesting thing that didn't add up to me is further in step (f) they subtract the Core losses from P_Conv in addition to the friction losses...
I don't quite understand why they solved Part (c) of the following problem that asks for the Air-Gap power P_ag the way they did.
They compute the air gap power in part (c) P_ag using the Thevinin equivalent circuit of the rotor and the line current solved for in part (a). See below:
The...
