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I think that you are getting a little bit carried away with the Moding.
The PCB that you are talking about is what creates the apparant rotating magnetic field to get the motor to turn, since these motors are brushless.
Also if by a magnetic rotator you are talking about a magnetic coupling (Motor with a magnet attached to it for turning a device without it being physically connected to the motor) I think you are living a little on the risky side. Putting a magnet inside the computer case, much less one that will be rotating therefore potentially inducing a current into metal parts, is not a very good ideal around the drives and chips.
Just buy a 5 buck ball bearing fan.
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