Patent ID: 8633627

Claim:
An apparatus comprising: a stator comprising a stator core, stator teeth and a plurality of stator windings coupled to the stator core; and a rotor disposed within the stator, the rotor comprising a rotor core and a plurality of rotor magnets coupled to the rotor core, wherein the plurality of rotor magnets are configured to have consecutive positive sinusoidal wave shaped profiles that are permanently disposed along the circumference of the rotor core, and further wherein the plurality of rotor magnets have a predefined orientation profile such that when a polyphase electric current including a synchronous harmonic component and a sub-harmonic component is supplied to the plurality of stator windings, the stator generates stator sub-harmonic and super-harmonic magnetic rotating fields, and the rotor rotation generates rotor sub-harmonic and super-harmonic magnetic rotating fields, wherein the stator sub-harmonic and super-harmonic magnetic rotating fields and the rotor sub-harmonic and super-harmonic magnetic rotating fields interact with each other to induce an aiding torque on the rotor.