Abstract: The invention relates to an actuator having an (auto)synchronous rotary electric motor and a reversible speed-reducing gearbox coupled to the motor to be driven in rotation thereby An outlet shaft is coupled to the speed-reducing gearbox to be driven in rotation thereby A first angular position sensor and a control circuit are connected to the motor. The circuit delivers a motor power supply signal that varies as a function of a position setpoint signal applied to the control circuit and as a function of signals delivered by the angular position sensor. The gearbox has a plurality of speed-reducing each having a pair of gears mounted to rotate about two parallel axes of rotation.

Abstract: The invention relates to an actuator (10) comprising: an (auto)synchronous rotary electric motor (11); a reversible speed-reducing gearbox (13) coupled to the motor to be driven in rotation thereby; an outlet shaft (16) coupled to the speed-reducing gearbox to be driven in rotation thereby; a first angular position sensor responsive to the angular position of the outlet shaft; and a control circuit connected to the angular position sensor and to the motor, said the circuit delivering a motor power supply signal that varies as a function of a position setpoint signal applied to the control circuit and as a function of signals delivered by the angular position sensor. The gearbox comprises a plurality of speed-reducing modules or stages (131 to 134), each comprising a pair of gears mounted to rotate about two parallel axes of rotation (17, 160).