How Strict is the Max Vsupply Calculation for Steppers?

[mattnedgus]

Thankyou, I think you may have mentioned that Gecko Guide before - that's where both of the methods for calculating the max voltage comes from.

My issue is that the voltage I'm using is 20% higher than the max recommended by those methods. In terms of designing Im wondering if I can go over those maximums for better performance and if so how much?

For example, in the 3 motors I was looking at (below), one has a really low inductance of 1.18mH and a recommended maximum voltage of between 32 and 35V. A supply of 68V seems way too high?

(I can't find speed-torque curves for Motor A and B (D57CM31 and D57CM31-4A) so I've emailed Leadshine for them to see how they might fair compared to each other.)


3.1NM NEMA 23 A
I = 4A
L = 2.8mH
V = 2.5V
Max Vsupply = 54V
Upper Vsafe = 50V
Corner Speed = 321RPM (based on 48Vsupply)

3.1NM NEMA 23 B
I = 6A
L = 1.18mH
V = 1.6V
Max Vsupply = 35V
Upper Vsafe = 32V
Corner Speed = 381RPM (based on 36Vsupply)

4.5NM NEMA 34
I = 5.5A
L = 4mH
V = 2.53V
Max Vsupply = 64V
Upper safe V = 51V
Corner Speed = 232RPM (based on 68Vsupply)