Patent ID: 6710495
Filing Date: 2004-03-23
Classification: H02K,H02P

Abstract:
A motor drive system comprising:(a) an electrical motor having a stator with a core, two three-phase stator windings wound on the core, the two three-phase windings separated spatially by 30 electrical degrees, each of the two three-phase windings having three terminals and a neutral terminal by which power may be applied to the three-phase windings, and a rotor within the stator; and (b) a first power supply connected to the terminals of a first of the stator three-phase windings and a second power supply connected to the terminals of a second of the stator three-phase windings, the power supplies formed to supply current to the two three-phase windings with the same fundamental frequency and with an additional zero sequence component at the third harmonic of the fundamental frequency, with one of the power supplies providing current to a one of the three-phase windings that is shifted in time by 30Â° of the fundamental frequency current with respect to the current provided by the other power supply.