Actuation system comprising a digital position sensor

Actuating system of the type comprising an electric motor (1) controlled by a computer (2) that is designed to regulate the current supplied to the motor (1) as a function of a position setpoint of the member that is to be actuated, said system comprising a device for transmitting the movement of the motor (1) to the member, said system being characterized in that the transmission device comprises an encoder (3) that is dependent on the movement of the motor (1), said encoder comprising a main multipolar track, and in that the system comprises:

• a fixed sensor (4) comprising at least two sensitive elements that are arranged facing and at an air-gap distance from the main track, said sensor being designed to deliver two square digital position signals (A, B) in quadrature which are representative of the position of the encoder (3);
• a device (5) for processing the signals (A, B), which device comprises counting means for determining, from an initial position, the actual position of the encoder (3);
• a device (6) for comparing the actual position of the encoder (3) with the position of the encoder (3) that corresponds in theory to the applied setpoint.