PURPOSE: To obtain a brushless self-excited generator which is constituted of a single winding and of a single pole without installing a special exciting circuit and without a need of an exciting current from the outside.

CONSTITUTION: Armature windings NA, NB, NCC of three phases are installed on the side of a stator 2 for a generator 1. The number of turns of the winding NA of one phase out of them is made smaller than that of the other two phases. A capacitor 5 is connected in parallel with the winding NA of one phase. A field winding 7 which is connected in a three-phase star shape is installed on a field core 6 on the side of a rotor 3. Two windings out of three phases are connected by diodes 8. The number of poles is made equal to that of the armature windings of three phases.