Timepiece mechanism provided with a magnetic gear

A timepiece mechanism comprising a magnetic gear formed of a first wheel and a second wheel, the first wheel being provided with N first alternating magnetic poles which are circularly arranged and define a first magnetic toothing, the second wheel being provided with teeth made of ferromagnetic material or with second alternating and circularly arranged magnetic poles, said teeth or said second magnetic poles defining a second magnetic toothing which has a magnetic coupling with the first magnetic toothing such that, when one of the first or second wheels is driven in rotation, said wheel rolls, via the magnetic coupling, over a geometric circle centred on the other wheel and linked to said other wheel;

• wherein the mechanism further comprises a ferromagnetic element or a set of ferromagnetic elements arranged, relative to the first wheel, so as to offset at least most of a magnetic disturbance torque to which said first wheel is subjected, resulting from said magnetic coupling, said magnetic disturbance torque having a periodic variation in intensity according to the angular position (α) of the first wheel relative to a reference half-axis starting from the central axis of the first wheel and intercepting the central axis of the second wheel.