According to :
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.

As Barry says, MUCH depends on the type of fan and type of motor.

If you can describe them (ie: "ordinary fractional HP induction motor
driving squirrel cage"), and what the symptoms are (seized? grinding?
hums?) we can make some suggestions.
--
Chris Lewis, Una confibula non set est
It's not just anyone who gets a Starship Cruiser class named after them.