A stator for an electric motor consisting at least of a stator core (1) with grooves (2) and splines (3) and with a winding which, in turn, consists of a plurality of part-windings. The part-windings are fitted in the grooves (2) and each part-winding consists of a plurality of first and second coil groups (6, 7) having different shapes. For a part-winding, the first coil group (6) is connected in alternation to a second coil group (7) by way of their electric connection ends (16).