Mechanical timepiece movement provided with a feedback system for the movement

A mechanical timepiece movement, which includes at least one barrel, a set of gear wheels driven at one end by the barrel, and an escapement mechanism of a local oscillator with a resonator in the form of a sprung balance, the escapement mechanism being driven at another end of the set of gear wheels, and a feedback system for the timepiece movement,

• wherein the feedback system includes a precise reference oscillator combined with a frequency comparator for comparing the frequency of the two oscillators and a mechanism for regulating the resonator of the local oscillator to slow down or accelerate the resonator based on the result of a comparison in the frequency comparator,
• wherein the reference oscillator of the feedback system is excited by magnetic interaction via a rotating exciter wheel in connection with a wheel of the set of gear wheels, and
• wherein the exciter wheel is a toothed wheel made of ferromagnetic material, and wherein the reference oscillator includes at least one permanent magnet disposed at a first end of an arm, which is secured via a base to a moving frame of the frequency comparator, the permanent magnet being disposed in proximity to the exciter wheel to be attracted by the passing of each tooth of the rotating exciter wheel and to generate an oscillation at a reference frequency of the reference oscillator.