Can I apply 12V intermittently to a 5V 28BYJ stepper motor?
I made a small robot with 4 28ByJ-48 5V steppers, however I think the 5V is the minimum recommended voltage they will run on. By increasing the voltage to the motors from 8V to 11.5V - I noticed quite a substantial increase in torque, and I could run them at a higher RPM before they started mis-stepping. I was able to run continuously and over heating was not evident. Using the standard driver boards that come with the motors.