I tried a Google search for the "carrier a/c motor part#54-50103-00" info you posted.
Except for other RV owners looking for the same numbered part I couldn't find the motor by the number you provided.
The website
Repair Clinic didn't list the part at all, which is puzzling.
Have you been to a Carrier dealer or service dept. to see if your A/C unit might have a substitute or upgraded part available?
I also entered the number 54-50103-00 in
American HVAC Parts website and they didn't know the part but wanted the model # of the A/C unit.
With the complete info on the Carrier A/C unit, I'm sure you'll track down the part needed, perhaps by a newer number.