Patent ID: 6639338
Filing Date: 2003-10-28
Classification: H02K,H02P

Abstract:
An AC electric motor comprising a stator and a rotor journalled for rotation about an axis relative to the stator, the rotor having an electrically continuous conductive loop, the loop having longitudinal portions spaced from and generally parallel to the axis and shunt portions extending between the ends of the longitudinal portions, the stator having at least two separate windings angularly displaced from one another about the axis of the rotor, an electrical circuit for selectively energizing and de-energizing the field windings with separate AC currents to develop an AC magnetic field vector that moves around the rotor axis, the field windings and conductive loop being arranged so that the AC magnetic field vector induces an AC current in the conductive loop and the reluctance of the loop operates to develop torque on the rotor that tends to cause it to rotate in synchronization with the movement of the magnetic field vector.