The invention relates to a system (1) for transferring a magnetic link (2) between a first element and a second element rotatable relative to the first element, a first end of said link being adapted to be attached to the first element and a second end of the link being adapted to be attached to the second element, characterised in that it comprises: a first part (11, 13) adapted to be rigidly connected to the first element; a second part (21, 23) rotatable relative to the first part and adapted to be rigidly connected to the second element so as to be rotationally driven at the rotational speed of said second element; a third part (30, 31) rotatable relative to the first and second parts, a member for coupling (40, 45) the second and third parts, adapted to rotationally drive the third part at a speed equal to half the rotational speed of the second element, two sets of two coaxial ferromagnetic surfaces for winding the magnetic link (2), a first set comprising a first surface integral with the first part and a second surface integral with the third part, a second set comprising a third surface integral with the second part and a fourth surface integral with the third part.