Hello,
I am trying to figure out what my power supply requirements are. I have been reading all over the place and are pretty confused by now.
Here are the stepper specs:

Part No.: 85BYGH450C-012
Frame Size: NEMA34
Step Angle: 1.8 degree
Voltage: 5.7V
Current: 3.5A/phase
Resistance: 1.9 Ohm/phase
Inductance: 22 mH/phase
Holding torque: 11.3N.m / 1600oz-in
Rotor inertia: 3600g-cm2
Number of wire leads: 4
Weight: 5 kg
Length: 151mm

Currently I have a single 48V/7.3A supply which seems undersize for those motors.

Here are my calculations:
3.5 A/phase x 2 phases/motor x 4 motors = 28 Amps

Are my calculations correct, and if so should I use multiple supplies or a single large one?

Thanks in advance!