A cable actuator comprising: · a frame; · a screw rotatably mounted on the frame and extending along a first axis (Ox); · a nut cooperating with the screw; · a first cable coupled to the nut and functionally connected to an outlet (16, 17, 22.4) of the actuator; · a second cable coupled to the nut and functionally connected to the outlet (22.4) of the actuator; and · a motor arranged to drive the screw in rotation; the first cable being arranged to exert forces that oppose the nut being driven in rotation by the screw so as to constitute anti-rotation means such that turning of the screw under drive from the motor causes the nut to move along the screw between a first extreme position (E 1) and a second extreme position (E 2) that define a stroke for the nut; and the cable actuator also comprising: · means for estimating the angular movement of the nut about the first axis (Lx) relative to the frame; and · means for estimating the force being applied to the outlet (22.4) of the cable actuator as a function of the angular movement of the nut about the first axis (Ox); wherein the means for estimating the angular movement of the nut comprise a distance sensor secured to the frame and using a thread to sense distance, one end (32.1) of the thread being connected to the nut at a connection point (4.1), characterized in that the distance sensor is arranged in such a manner that the thread changes curvature at a first point situated in a first plane (P 1) orthogonal to the first axis (Ox), the first plane (P 1) being situated at a first distance (d 1) from the first extreme position (E 1) that lies in the range 30% to 70% of the stroke. · a frame; · a screw rotatably mounted on the frame and extending along a first axis (Ox); · a nut cooperating with the screw; · a first cable coupled to the nut and functionally connected to an outlet (16, 17, 22.4) of the actuator; · a second cable coupled to the nut and functionally connected to the outlet (22.4) of the actuator; and · a motor arranged to drive the screw in rotation; the first cable being arranged to exert forces that oppose the nut being driven in rotation by the screw so as to constitute anti-rotation means such that turning of the screw under drive from the motor causes the nut to move along the screw between a first extreme position (E 1) and a second extreme position (E 2) that define a stroke for the nut; and the cable actuator also comprising: · means for estimating the angular movement of the nut about the first axis (Lx) relative to the frame; and · means for estimating the force being applied to the outlet (22.4) of the cable actuator as a function of the angular movement of the nut about the first axis (Ox); wherein the means for estimating the angular movement of the nut comprise a distance sensor secured to the frame and using a thread to sense distance, one end (32.1) of the thread being connected to the nut at a connection point (4.1), characterized in that the distance sensor is arranged in such a manner that the thread changes curvature at a first point situated in a first plane (P 1) orthogonal to the first axis (Ox), the first plane (P 1) being situated at a first distance (d 1) from the first extreme position (E 1) that lies in the range 30% to 70% of the stroke. the first cable being arranged to exert forces that oppose the nut being driven in rotation by the screw so as to constitute anti-rotation means such that turning of the screw under drive from the motor causes the nut to move along the screw between a first extreme position (E 1) and a second extreme position (E 2) that define a stroke for the nut; and the cable actuator also comprising: · means for estimating the angular movement of the nut about the first axis (Lx) relative to the frame; and · means for estimating the force being applied to the outlet (22.4) of the cable actuator as a function of the angular movement of the nut about the first axis (Ox); · means for estimating the angular movement of the nut about the first axis (Lx) relative to the frame; and · means for estimating the force being applied to the outlet (22.4) of the cable actuator as a function of the angular movement of the nut about the first axis (Ox); wherein the means for estimating the angular movement of the nut comprise a distance sensor secured to the frame and using a thread to sense distance, one end (32.1) of the thread being connected to the nut at a connection point (4.1), characterized in that the distance sensor is arranged in such a manner that the thread changes curvature at a first point situated in a first plane (P 1) orthogonal to the first axis (Ox), the first plane (P 1) being situated at a first distance (d 1) from the first extreme position (E 1) that lies in the range 30% to 70% of the stroke.