Patent ID: 8330319

Claim:
A permanent magnet-less, brushless synchronous system comprising: a stator that generates a magnetic rotating field when sourced by an alternating current; an uncluttered rotor disposed within the magnetic rotating field and spaced apart from the stator to form an air gap relative to an axis of rotation, the uncluttered rotor comprising a plurality of U-like shaped sections distributed about an outer periphery of the uncluttered rotor wherein each and every one of the plurality of U-like shaped sections on the uncluttered rotor partially encloses a magnetic pole and all of these magnetic poles have the same polarity, each of the U-like shaped sections is formed by a plurality of non-continuous cut-out grooves that pass through a width of the uncluttered rotor, each non-continuous cut-out groove separated from other non-continuous cut-out grooves around the same magnetic pole; and an excitation core spaced apart from the stator and the uncluttered rotor that magnetically couples the uncluttered rotor; where an excitation coil generates a magnet torque by inducing magnetic poles that interact with the stator currents near an outer peripheral surface of the uncluttered rotor; and where the stator generates a reluctance torque by a reaction of a flux generated by the stator currents which goes through the different direct and quadrature flux paths of the uncluttered rotor.