The device (10) has a rotor (1) i.e. balance wheel, guided in rotation around a vertical axis (XX) by radial guiding units (4, 5) chosen from a group comprising ball bearings, roller bearings, needle bearings and magnetic bearings, where the rotor is carried along the axis between a mechanical roller stop (2) e.g. conical roller stop or ball stop, and a magnetic suspension (3). The magnetic suspension has solid or opened conductor rings (7) arranged opposite to magnets. The magnetic suspension is arranged parallel to the roller stop.