Abstract: The calculating methed of a new type of electromagnetic power step motor is presented. The formulas for self-lock torque locating rotor when stator Circuits are opened and for low speed synchronous Torque in the case of two-phase steady symmetric a. c. currents in two adjoining stator windings are also developed. Using the formulas, various torques of a 2 kg·m electromagnetic power step motor are calculated and compared With the results of tests.