This motor is homemade. We home schooled our children and as the Science teacher, I found this motor in an experiment book. It really shows all of the components very well. Of all the DC motors on this website this was the most difficult to build, but at the same time the most satisfying. It was difficult from the standpoint of determining the number of windings on the armature and the number of windings on the fixed magnets (nails on either side of the armature). The most difficult part of making this motor was getting the brushes lined up so the circuit completed at the proper time.