Oscillator for timepiece movement

An oscillator for a clockwork movement, including an arbor intended to be mounted on an element of a frame of the clockwork movement to define a rotation axis of a balance comprising a hub secured to a suspended mass, angularly extended, bearing a first bipolar magnet, arranged at a distance from said arbor, having magnetic poles of which are oriented substantially in a tangential direction in reference to said arbor, and able, depending on the angular position of said balance, to be positioned within range of a magnetic field produced by at least one stationary bipolar magnet, secured to a support intended to be assembled to said frame of the clockwork movement, said stationary bipolar magnet being situated on the trajectory of said first bipolar magnet as defined by the rotation of said balance, while being arranged on said support such that, when said first bipolar magnet comes closer to said stationary bipolar magnet, identical polarities are facing each other to lead to a return force moment acting on said balance,

• said suspended mass of said balance bearing a second bipolar magnet having an arrangement similar to that of said first bipolar magnet, such that said first bipolar magnet and said second bipolar magnets are able to cooperate alternatingly with said stationary bipolar magnet to lead to opposite respective return force moments, and
• the oscillator further including a pallet and an escape-wheel designed to establish a kinematic link between an energy source of the clockwork movement and said balance and arranged such that said balance can have a sustained periodic oscillating movement with an amplitude greater than 90 degrees.