Magnetic detection device with absolute multitour position

The invention relates to a device for absolute position magnetic detection of an input shaft capable of undergoing a rotation greater than 360 °, this device comprising a main magnetic sensor (2, 6), a motion reducer (1, 4). ), and a secondary magnetic sensor (7, 9), the main magnetic sensor (2, 6) being connected to a rotor (5), measuring the rotation of the shaft over angular ranges less than 360 °, and including a main magnet (2), the motion reducer (1, 4) transforming the rotation of the shaft into a reduced rotation of maximum amplitude at most equal to 360 °, and the secondary magnetic sensor (7, 9) measuring the rotation reduced and including a secondary magnet (9). According to the invention, the secondary magnet (9) is arranged between the upper and lower planes of the main rotor (5), and the main magnet (2) has P pairs of poles, with P greater than 1