| 摘要 |
The invention relates to an actuator (9) comprising a rotary electric motor (12) a screw Old) driven in rotation by the motor, a mechanical member (15) driven in translation by the screw, a first position sensor (40) sensitive to a position of the electric motor and/or of the screw, a second position sensor (41) sensitive to a position of the mechanical member, and a servo-control circuit (11) connected to both of the position sensors and to the motor, this circuit delivering a power supply signal to the motor that varies as a function of a position setpoint signal (23) and as a function of signals delivered by the two position sensors; the second position sensor presents a resolution that is at least equivalent to the resolution of the first position sensor, and the servo-control circuit includes redundant modules (19, 22) for calculating the position of the mechanical member as a function of the signals/data delivered by the two sensors, together with at least two modules (17, 18) for mutual surveillance of the results delivered by the calculation modules.
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