Quote
george4657
If you only can go 250 RPM something is wrong.
At 3000 RPM = 3000*400/60 = 20,000 steps per second which an arduino should be able to do.
You can run this fast but will have no power at this speed. See torque chart.
What are your current settings?
What program are you using to run the stepper?
Does the motor get warm/hot when running?
How are you measuring the RPM?
Actualy i set the delay in microseconds on the output pin on arduino. The delay time was 500us so it is 0.0005s.
If we calculate this time to frequency we get 2000 Hz - that is 2000 pulses in one second.
That means if i go with 400 steps/ revolution i get 5 revolution per second and 300 RPM.
I measured by counting and compare with the delay i set in the arduino code.
While running on that 300 RPM it doesnt get hot, it gets hot when i speed it up and the motor stops and start vibrating <- there gets hot.