Hi,
isn't it a bit late to ask about that AFTER you've ordered and paid for them?
What they do publish is the specs, particularly the inductance...which they claim to be 2.5mH. That's not great but not the
worst I've seen either. With 23 size steppers you should aim for 1mH or less and 2mH or less in 34 size steppers.
Inductance determines how quickly the torque degrades as the speed increases, the lower the inductance the better.
For instance with a 23 size stepper of 1mH you might expect 25-40% of rated holding torque at 1000 rpm. A 23 size stepper
of 2.5mH might have about 10% of rated holding torque at 1000 rpm.
As you can see the torque at speed is VERY sensitive to the inductance. First time buyers tend to buy on holding torque alone
overlooking the inductance spec. Its often the case that a stepper that has lower holding torque but also having lower inductance may
retain more torque at speed than another unit that has high holding torque but commensurately high inductance and thus the lower torque
unit perform better overall.
Many manufacturers don't publish speed/torque curves because they know that their products perform modestly typically because they
have selected a high inductance design which produces great holding torque but very low torque at speed.
Craig