Stepper motor wiring diagram 6 wires - The motor seems to run flawlessly, but after a minute or so it will become extremely warm. I do not have something to degree the actual temp but it is painful to put my hands on it for greater than 1/2 a 2nd. Given the circuit above, cast off the zener and placed a resitor and a 100uf 25v capacitor in series between com and gnd (com -> r -> c -> gnd): the motor runs nicely but still overheats.
It became salvaged from an vintage electric typewriter, and the uln2003a and zener from the motive force board within the identical tool. It's a 5 wires motor, but the one inside the schematic is 6 wires. I think the only difference is that the 5 twine version has the 2 center faucets joined together so that is what you notice in my schematic. As you may see from your drawing (even though it has a tendency now not to be intuitive at the start glance) - every centre tapped winding is like two magnetically coupled inductors or halves of a transformer winding. When you connect the centre faucet to v and floor one stop the alternative stop rises to two x v - or tries to. But each driven output is hooked up through a diode to com (anode to driving force, cathode to com). While you ground one quit of the winding and the other quit is attached to v thru a diode you are trying to power the deliver with 2 x deliver (much less a diode drop). Something has to provide. As you've got located.