First of all, the manufacturer's name is "Dometic". This will be useful in looking things up online. Do You have the model number of the awning?
Researching this online, I saw some discussion of Dometic awning recalls because of motor failures. Motors can be found with a Google search or on E-Bay. I used "Dometic RV awning motor" as a search term.
With the cost of labor, you may not be able to get this motor rebuilt at a cost effective price. I suggest you see if there are any automobile starter/alternator re-builders in your area who might be able to do this job.
I found a BUNCH of promising looking how-to videos on You Tube using the same search terms.
I personally have a MANUAL awning with no motor system to go bad.