Patent ID: 8013553

Claim:
A rotary electric system comprising: a rotary electric machine provided with a rotor, a common stator core, and a pair of first and second star-connected multiphase stator windings each with a neutral point, the neutral point of the first star-connected multiphase stator windings and the neutral point of the second star-connected multiphase stator windings having a same potential, the first and second star-connected multiphase stator windings being wound in the common stator core with a predetermined first phase difference therebetween, the rotary electric machine configured to rotate the rotor when at least one of the first and second star-connected multiphase stator windings is energized; a pair of first and second multiphase inverters each having a high-side terminal and a common low-side terminal, the first multiphase inverter including a high-side switching element and a low-side switching element per phase of the first multiphase stator windings, the second multiphase inverter including a high-side switching element and a low-side switching element per phase of the second multiphase stator windings; a capacitor connected between the high-side terminal and the low-side terminal of each of the first and second multiphase inverters; a direct current power source connected between at least one of the high-side terminal and the low-side terminal of each of the first and second multiphase inverters and the neutral points of the first and second multiphase stator windings; and a controller connected with the high-side and low-side switching elements per phase of each of the first and second multiphase stator windings and configured to turn the high-side and low-side switching elements on and off to thereby cause: the first multiphase inverter to intermittently supply a first phase current to the first star-connected multiphase stator windings per phase to charge first electromagnetic energy in the first star-connected multiphase stator windings per phase, the first electromagnetic energy charging the capacitor; the second multiphase inverter to intermittently supply a second phase current to the second star-connected multiphase stator windings per phase to charge second electromagnetic energy in the second star-connected multiphase stator windings per phase, the second electromagnetic energy charging the capacitor, the first phase current for each phase and the second phase current for a corresponding one phase having a predetermined second phase difference from each other, the first phase difference being matched with the second phase difference.