Patent ID: 7969104

Claim:
A rotary electric system comprising: a rotary electric machine provided with an armature core and star-connected multiphase windings with a neutral point wound in the armature core, the rotary electric machine working to create torque when the star-connected multiphase windings are energized; a direct current power source connected with the neutral point of the star-connected multiphase windings; and a multiphase inverter connected with the star-connected multiphase windings and configured to convert a direct current voltage of the direct current power source into multiphase alternating current voltages and to supply the multiphase alternating current voltages to the star-connected multiphase windings to thereby energize the star-connected multiphase windings, wherein each of the star-connected multiphase windings has a predetermined winding configuration that prevents, when a zero-phase current is supplied from the direct current power source to the star-connected multiphase windings via the neutral point, a zero-phase magnetic flux created in the armature core based on the zero-phase current flowing in each phase winding of the star-connected multiphase windings from being cancelled out by a zero-phase magnetic flux created in the armature core based on the zero-phase current flowing in another one phase winding of the star-connected multiphase windings, and wherein the rotary electric machine comprises a rotor that has a plurality of magnetic poles arranged at regular pitches and that rotates based on the created torque, and each of the star-connected multiphase windings is wound in the armature core in any one of 5π/6 radian fractional-pitch winding and 7π/6 radian long-pitch winding as the predetermined winding configuration, the 5π/6 radian fractional-pitch winding representing that a winding pitch between the multiphase windings is an electric angle of 5π/6 radian smaller than the regular pitches of the magnetic poles, the 7π/6 radian long-pitch winding representing that a winding pitch between the multiphase windings is an electric angle of 7π/6 radian longer than the regular pitches of the magnetic poles.