The selection of the optimal winding geometry in order to improve the efficiency in electric machines derives from the fact that the level of eddy current losses in machine windings is strongly correlated to the manner of disposition of coil conductors in machine slots. To compute the additional eddy current losses which are part of the total copper losses in the slot windings of electric machines, finite-element modeling is often used; it usually employs moving band technique to perform the rotor motion and Newton-Raphson iterations to deal with the non-linear behavior of magnetic circuits. Finite-element modeling leads then to a substantial computational time which hinders any process of conception and optimization of winding geometries. As an alternative, the analytic calculation that incorporates several simplification hypotheses is investigated. Even though, it is less accurate with regard to the finite-element approach, it presents a first suggestion to select the optimal winding configuration. It is very fast and shows therefore clear interests in repetitive analyses.