I looked at the stepper drivers you have in your catalog. In all of them you state that they can handle up until a certain current but will require cooling for it to do so. For example, the A4988 driver can handle up to 2A, but may require cooling from 1A and above.
Aside from rated current, different motors have different rated voltages i.e. if they were operated in this voltage without any current limiting they would draw that rated current.
What I want to ask is the following: If I were to operate two motors with the same current and operating voltage (whether by current limiting or not) how would different rated voltages affect the heating of the driver? For example: Motor A has a rated voltage of 4V and a current of 1A and motor B has a rated voltage of 2V and a current of 2A. Given that I operate them at 12V and limit their current to 1A it would seem that motor A will cause the driver to heat more since it draws 1A over 4V (12V chopped by the driver) while motor B will draw 1A over 1V (since its resistance is 1ohm given its rating). Is it so indeed?