US Patent 10024405 Dual redundant linear actuator

A linear actuator includes a planetary gear system including a sun gear, a ring gear, and a planet carrier. A linear output mechanism is coupled to the planetary gear system. A first motor is configured to drive a first input shaft, and the first input shaft is coupled to the planet carrier. A second motor is configured to drive a second input shaft, and the second input shaft is coupled to one of the sun gear and the ring gear.