Can't see enough from here to say. What sort of fans are they, and can you describe the damage? What could have gone wrong- shaft stiction, bushing/thrust bearing worn so that armature rubs, overheated wiring.
Modern motor wiring insulation, it should be noted, is rated for much higher temps than in "old days", so if it's fried you really had a problem.
Reasonable concerns: you might start a fire, or electrocute someone, as a result of having a go. For such basic safety reasons, I'd suggest that you take them to a professional for repair.
HTH, J