I saw this thing on how to make a vertical wind generator and I wanted to try it, but I didn't have a motor to use to generate electricity. Anyway so today I was cleaning out our garage and came across a box fan that the blades had broken off so I took the motor out of it and... Also there is a plain black box with 2 wires attached to the motor on the side of it? Whats that for? I can take a pic and wires come out of the motor into the box and go nowhere else? Anyway I read you need a "permanent magnet motor" so how do I tell if it is one?