To be able to calculate the performances of a hybrid stepping motor or to design it in a short time, it is essential to apply an efficient model, accepting a slight loss of precision. Using software based on finite elements and executing calculations are difficult and time consuming, but normally offers increased precision. Finite elements may be used to better understand some phenomena and help establishing an analytic modeling based on magnetic equivalent scheme. Torque calculation is therefore much faster and permits to easily optimize a given structure. The dynamic modeling permits an estimation of dynamic behavior of the hybrid stepping motor in stationary and transient states.