Both motors in the original post are good. Coil resistance is 1,8 ohms and 1,25 ohms respectively.
The voltage rating on the label of the stepper motor is not the voltage the motor is intended to run at. The whole point is to run the motor at a voltage much higher than labelled, because this makes current rise faster and that means flux rises faster and that means power transferred to rotor is better. If the voltage is too low, and the motor rotates fast, the driver needs to reverse coil polarity before the current reaches the Ipeak set point, so the total power becomes much and much less at speeds. Which happens anyway, meaning torque will go down at speeds, but the point of running voltage much more higher than label, is exactly to help with that.
The voltage rating on a dc motor is the rating the motor is intended to be run at, while the voltage on the stepper is the voltage which together with coil resistance give a rated current that is more like a maximum that we dont actually care about, because the driver takes care to limit that anyway. And the driver ic will burn before the coil wire, so not even second failmode thoughts.
The voltage rating on the label of the stepper motor is not the voltage the motor is intended to run at. The whole point is to run the motor at a voltage much higher than labelled, because this makes current rise faster and that means flux rises faster and that means power transferred to rotor is better. If the voltage is too low, and the motor rotates fast, the driver needs to reverse coil polarity before the current reaches the Ipeak set point, so the total power becomes much and much less at speeds. Which happens anyway, meaning torque will go down at speeds, but the point of running voltage much more higher than label, is exactly to help with that.
The voltage rating on a dc motor is the rating the motor is intended to be run at, while the voltage on the stepper is the voltage which together with coil resistance give a rated current that is more like a maximum that we dont actually care about, because the driver takes care to limit that anyway. And the driver ic will burn before the coil wire, so not even second failmode thoughts.