An exemplary power system may include an electric machine with multiple sets of stator windings, each set of windings being coupled through a separate switch matrix to a common voltage bus, and each of which may be spatially arranged in full pitch around the stator such that stator flux harmonics are...http://www.google.fr/patents/US7960948?utm_source=gb-gplus-shareBrevet US7960948 - Electromechanical energy conversion systems
