Patent ID: 8264177

Claim:
An efficient hub motor, the hub motor comprising: one or more stators fixedly attached to a shaft, each stator comprising a non-magnetic, non-conductive material; two or more coils embedded in each stator in a circular pattern, wherein a row of coils are each positioned a same radius from the center of a stator, wherein each coil in the row is of a uniform size with a non-conductive, non-magnetic core wherein a conductor is wound around the core; two or more rotors rotatably coupled to the shaft such that the shaft defines an axis of rotation of the two or more rotors, wherein each stator is sandwiched between two rotors; two or more permanent magnets embedded in each rotor, each permanent magnet having a similar cross-sectional shape as a core with an end of each of the permanent magnets positioned toward a stator, the permanent magnets positioned in a circular pattern with a radius substantially similar to the radius of the coils, the permanent magnets positioned such that when a coil aligns with a permanent magnet a next coil aligns between two magnets; two or more shorting bars comprising a conductive material, each shorting bar connecting an exterior edge of two or more permanent magnets, the exterior edge not facing a stator; and a sequence control that connects each coil such that current flows in a coil in one direction and the sequence control disconnects the coil and reconnects the coil with current flowing in the opposite direction in response to a set of permanent magnets aligning with a predefined position relative to the coil; wherein a length of the two or more permanent magnets measured parallel to the axis of rotation is longer than a distance between two adjacent permanent magnets in the two or more rotors or is at least as long as a distance between two rotors.