The current on the motor is the amount required to deliver the rated holding torque. You do *not* want to exceed the rated current on your drivers. You can always reduce the current into your motors so your drivers do not melt down. That will reduce their holding torque. At some point (half current, maybe less) you will not have enough current for them to accurately step at a reasonable rate. The normal drivers don't like much over 1.2A or so. The max you could do with your motor is 1/2 current. Remember that the holding torque is always greater than output when stepping quickly. Static holding is a "best case" situation.
There is no advantage to a very low voltage / high current motor that poorly matches your supply voltage at the stepping rates we normally use. You are trying to drive a constant sine wave current through an R + L load. The power into the motor is either max or nothing. It's fairly easy to go through the math and see what the result is. (I can give you a pointer to the math if you need it. It goes on for a while).
If you want to do high power stepping at very fast rates, that's something different. You will need high power drivers to get that done. You will also need a machine design that will hang in there with major dynamic loads. You will also need fans on your motors ....
Power supply wise, you would want a supply around 8 volts for these motors rather than 13 to 17V.
There is no advantage to a very low voltage / high current motor that poorly matches your supply voltage at the stepping rates we normally use. You are trying to drive a constant sine wave current through an R + L load. The power into the motor is either max or nothing. It's fairly easy to go through the math and see what the result is. (I can give you a pointer to the math if you need it. It goes on for a while).
If you want to do high power stepping at very fast rates, that's something different. You will need high power drivers to get that done. You will also need a machine design that will hang in there with major dynamic loads. You will also need fans on your motors ....
Power supply wise, you would want a supply around 8 volts for these motors rather than 13 to 17V.