I am testing a stepper motor (PKP264MD28A oriental) with ST motor driver L6470. But the motor only runs at low speed and high speed. Now less than 400pps and more than 6000pps are stable but the motor is step-out state or very unstable during 400 to 6000pps. I want to use the motor at about 1000 - 6000pps.I use the driver by 1/128 step mode and current is about 1A. Other registrars were set according to ST datasheet. Why is the motor unstable at intermediate speed? Should I set what values in the registrars?
