On Fri, Mar 18, 2016, at 05:18 PM, Nicklas Karlsson wrote:
> 
> Stepper motor magnets induce a voltage proportional to speed which limit 
> maximum speed.
> Torque is about the same regardless of speed and there are some intertia.
> 

Torque is not even remotely the same regardless of speed.
Above a certain base speed (usually well below max speed), a stepper
motor is more constant-power than constant-torque, so the torque
drops off inversely with the speed.

The actual shape of the torque-speed curve is complex and depends
on motor characteristics, drive characteristics, and supply voltage.

For some examples, see
http://www.orientalmotor.com/technology/articles/article-speed-torque-curves-for-step-motors.html

Regards,

John Kasunich

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