Abstract: An electric motor comprises a stator provided with a helical magnetic core within whose grooves is laid an armature winding, and a rotor disposed within a stator boring. The rotor is provided with salients for forming a main magnetic field, disposed therearound along a helical line, the length of the salients being equal to .alpha..delta..tau., and the distance therebetween being (2-.alpha..delta.).tau., where .alpha..delta. is a coefficient of a rated pole arc, and .tau. is a pole pitch of the motor. According to the invention, in the magnetic core is provided an additional groove wherein is laid an excitation winding, the portions of each turn of the magnetic core whereon the armature winding and the excitation winding are disposed have such a length which ensures axial alignment of the grooves for placing the armature winding within all the turns of the magnetic core.