Abstract: The invention relates to a novel method for determining the multipole windings of electric induction machines. This method is based on the operational modulation, which consists in modulating a 2p-pole basic winding by q sequences of complex operators (a.sup.o, a.sup.1, . . . a.sup.r, . . . a.sup.m-1) wherein said operators are the m m.sup.th roots of the unity in a m - phased system, so that the polarity of the modulated winding is .vertline.2p.+-.2q.vertline.. In a 3-phased system, the wiring diagram consists e.g. in 9 main branches of windings coupled into 3 main parallel coupled stars, and this diagram requires only 6 outputs and two 3-pole switches for switching from one speed to the other.