Patent ID: 7728478

Claim:
An electrodynamic machine comprising: an inner rotor; an outer rotor disposed around the inner rotor for interaction therewith, the inner rotor being mounted on a second shaft for rotation therewith, the outer rotor being mounted on a first shaft for rotation about the inner rotor; and a gear means for rotating the outer and inner rotors relative to each other, the gear means including: a) first and second driven pinions, the first driven pinion being connected directly to the outer rotor to effect rotation thereof, and the second driven pinion being connected directly to the second shaft for rotation therewith to effect rotation of the inner rotor, and b) a drive pinion in meshing engagement between the first and second driven pinions, the drive pinion being connected directly to a drive shaft, wherein the second shaft and the drive shaft are each arranged and configured to receive rotational drive from an external source to cause rotation of the second driven pinion, wherein input torque applied to the second shaft causes rotation of the second driven pinion that is transmitted to the first driven pinion through the drive pinion, whereby an output torque is provided to the first shaft and the drive shaft for driving an external load.