^^^ exactly ..... see where this is leading?

EDIT: actually, that range is for the motor. The fan can spin anywhere from 600 to about 4000 rpms, but the motors are almost always 1750 or 3500 rpms ..... not too much variation on 60Hz - 3 phase power.

 

Hook it up to some gears... you could get it to 100K!!!!

 

the gears would require more input power ...... one of the first problems.