I have a two-phase bipolar stepper motor rated on 4.2 amps per phase (parallel connection). The peak current draw for this motor: 4.2 A * sqrt(2) = 4.2 * 1,41 = 5,92 A.
I'm looking for a matching stepper motor driver and I'm considering two options:
a) 2DM556S - it is rated for maximum of 4.2 A (RMS) = 5.88 A (peak)
(manufacturer assumes that sqrt(2) = 1.4, so 4.2 * 1,4 = 5.88 A)
https://www.cnczone.com/forums/attac...d=460784&stc=1
b) 2DM860H - it is rated for maximum of 6.0 A (RMS) = 8.40 A (peak), so absolutely no problem running this motor, but the cost is twice as high, compared to the 2DM556S.
https://www.cnczone.com/forums/attac...d=460788&stc=1
On a first glance, this 2DM556S driver would match my motor (same peak current draw), but is it a good idea to run the motor on the maximum possible setting of a driver (is it safe for the driver itself or would I be risking its damage in the longer period of time)? Should I pick a driver with a higher maximum peak current?