Abstract: A combination generator and starter motor includes a rotor with an internal ring gear, a plurality of dual pinion gears which mesh with the rotor and two sun gears which mesh with the dual pinion gears. A large torque multiplication from the rotor to one of the sun gears is provided when the combination generator and starter motor operates as a starter motor. A one-to-one ratio of rotation between that sun gear and the rotor is provided when the combination generator and starter motor operates as a generator.