Special Electrical Machines E.g. Janardanan Pdf Free [best] -

[ \beta_s = \frac360m \cdot N_r ] Where (\beta_s) = step angle, (m) = number of phases, (N_r) = number of rotor teeth.

: Including linear induction motors.

The book is structured into specific units detailing the mechanics and control of various machine types: Google Books Stepper Motors: Special Electrical Machines E.g. Janardanan Pdf Free