Patent ID: 7397156

Claim:
A tandem rotary electric machine comprising: a primary stator-rotor pair and a secondary stator-rotor pair, each pair comprising: a rotor core on which field windings are wound and a stator core on which a stator coil is wound; a rectifier device, configured to rectify voltages generated by both of the stator coils, placed at the outside of the secondary stator-rotor pair in its axial direction and separated from the primary stator-rotor pair; and a controller configured to independently control field currents of both the primary stator-rotor pair and the secondary stator-rotor pair, wherein both of the rotor cores are arranged adjacent to each other, fixed to a same rotary shaft, and driven by a vehicular engine, a stator winding of each phase of the stator coil in the primary stator-rotor pair has (2N 1 /3) turns, and a stator winding of each phase of the stator coil in the secondary stator-rotor pair has ((2N 2/ 3) −1) turns, where a number of slots in the primary stator-rotor pair is N 1 and a number of slots in the secondary stator-rotor pair is N 2 , and the stator coil of the primary stator-rotor pair is connected to the rectifier device through a connection lead wire penetrated through a specified slot of the stator core in the secondary stator-rotor pair.