My good friend and colleague,
 If you have one of these in your shop, why don't you waste a couple of hours and
just
 SEE why it wont work.

 I'm sure that you could "get" it to work but it is not worth the hassle.



  > A general "square" DC brushless muffin fan will not work because it
 > > takes energy and pulses it around a circular ring of magnetic
 > > material.
 >
 >   Bong!  Missed the boat on that one!  Alice's suggestion of running
 > such a fan as a generator by adding a bridge rectifier is apt.