Patent ID: 7764035

Claim:
An actuator ( 9 ) comprising a rotary electric motor ( 12 ), a screw ( 14 ) arranged to be driven in rotation by rotation of the motor, a mechanical member ( 15 ) arranged to be driven in translation by rotation of the screw, a first position sensor ( 40 ) sensitive to at least one position of the rotary electric motor and/or of the screw, a second position sensor ( 41 ) sensitive to at least one position of the mechanical member, and a servo-control circuit ( 11 ) connected to both of the position sensors and to the motor, said circuit delivering a motor power supply signal that varies as a function of a position setpoint signal ( 23 ) applied to the servo-control circuit and as a function of the signals delivered by the two position sensors, wherein the second position sensor presents a resolution greater than the resolution of the first position sensor such that these two sensors present redundancy, and the servo-control circuit includes redundant modules ( 19 , 22 )for determining the position of the mechanical member as a function of the signals/data delivered by the two sensors, together with modules ( 17 , 18 ) for mutually monitoring the results delivered by the calculation modules.