There are so many accomplished and electrically inclined people here… I have a question. Linux CnC ask for a frequency of driving a stepper motor.

Information on questioned variable to be calculated.

http://linuxcnc.org/docs/html/config/stepconf.html#_spindle_speed_control

This is my motor.

This is my driver.

http://www.ti.com/lit/ds/symlink/drv8825.pdf

This is my board

http://pico-systems.com/cramps.html

https://reprap.org/wiki/CRAMPS

I consider the motor to be a power source, resistor and inductor in series. This forums a first order circuit. I then look at the first orders time constant to determine upper limiting driving signal.

L=3mH

R=1.4 ohms

time constant= L/R = 3mH/1.4ohm= 0.002143s

The inversion of the time constant is my frequency.

Frequency=1/time constant=1/0.002143s= 466.67Hz

Upper limit of 466.67Hz. Which seems reasonable given the base value in the program. I set the frequency to 300.hz

I have only done the initial calculation. How would you calculate this number?