Rotary electric apparatus for vehicle

An on-vehicle rotary electric apparatus, comprising;

• a stator configured to be equipped with multi-phase windings;
• a rotor configured to have magnetic poles and to be equipped with two partial field windings for producing a magnetic field in response to supply of an exciting current to the field windings, the rotor being driven to rotate by an on-vehicle driving source, a single-phase alternating current being supplied through each of the two partial field windings in a one-way direction, the one-way direction assigned to each of the partial field windings being different one from the other;
• short-circuit windings wound around part of the magnetic poles of the rotor so that the short-circuit windings produce a further magnetic field delayed in phase by substantially 90 degrees compared to the magnetic field produced by the field windings;
• and
• a current-supply unit for supplying the single-phase alternating current to the field windings,
• wherein the current-supply unit includes two switching elements each connected to the two partial field windings and a field controller controlling on/off operations of the two switching elements so that the single-phase alternating current alternately passes through each partial winding in each of the two one-way directions.