If someone wanted to use these 13Ohm steppers, they would need to adjust the current setting down in the drivers. That would reduce the power and possibly keep a similar amount of torque. It would need to go down to less than 150mA or so. Higher resistance may mean more coils and the smaller current could be similar torque rating.
There are probably other limiting reasons to not use these steppers.
Ill find mine and post a picture if i find it that is somewhere in the 70 or 80’s
Uh-oh! I was studying EE in 1972… and technician-ing 5 years before that. Dirt… and, my question would be, am I still ABOVE it?
Seriously, I hope this has been resolved by now. I’ve just read this thread for the first time today but I’m pretty sure the new motors should have solved the problem. Has anyone heard?
Googling those Minebea 17PM-K402-P4V stepper motors, they show to be 6-wire unipolar motors (2 coils with center tap…). And my question would be which 4-wires were selected to go to Jackpot’s 4-wire bipolar drivers? I suspect the center-taps were left unconnected and the combined resistance of the windings either side of the center-tap would have certainly been much higher than normal… as his 13 ohms kinda indicates. Not clear whether it might have kinda tried to act like a biplor motor hooked up that way… but given the same constant-current through 2 ohms vs 13 ohms, I can see why his motors were too hot to touch.
Or, maybe I just need a nap…
