Looking at these two motors:
NEMA23 270oz/in 2.8A Stepper Motor ¼” Dual Shaft (KL23H276-28-4B)
NEMA23 425oz/in 2.8A Stepper Motor ¼” Dual shaft (KL23H286-20-8B)
It has been suggested that I should get a 48V/7.3A power supply instead of a 36V/9.7A power supply, because higher voltage means better torque.
I am trying to calculate what the maximum current draw will be for the entire system, but the more I think about it the less it makes sense.
At what voltage is that 2.8 amp rating on the motor for?
The only voltage listed on the spec sheets are 3.2V & 4.17V, respectively. That does fit when you plug in the rated ohms value of its resistance; 2.8A x 1.13ohm = 3.2V and 2.8A x 1.5ohm = 4.2V.
But nobody actually runs these motors at that voltage, they are sold with a 36V psu and I am being told to go 48V. Given the linear relationship of ohms law would I would assume that at 48V each motor will draw (48V/1.5ohm) = 32A? That would certainly burn out the power supply! But I know for a fact that a ~9A power supply is enough for 3 of these things at 36V...
So how do I determine exactly what current these motors will draw at higher voltages, and if my PSU is adequate?
Thanks!