About 3 coil switched reluctance motor

I am trying to drive a 3 coil switched reluctance motor, like the one in the picture.

I wish to use it at speeds like 900, 1250, 1500 and 1800 rpm.

This means i have to calculate proper on and off miliseconds for coil1, coil2 and coil3.

How can i find out the proper values for each speed? I plan to drive them by means of tip120 darlingtons.SwitchedReluctanceMotor

Based on the lack of any necessary information, I have to ask when is the assignment due?

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I'm not a mathematics person but below sounds right to me

  1. How many milliseconds for one turn?
  2. How many activations for one turn?
  3. Divide.