Patent ID: 7479717

Claim:
A turbomachine having a longitudinal axis, the turbomachine comprising an annular rotor centered on the longitudinal axis of the turbomachine, an annular stator disposed coaxially around the rotor, at least one ball bearing disposed on the rotor and rotatably supporting said stator, the inside of the rotor defining part of an oil enclosure for cooling and lubricating the balls of the bearing, and an electricity generator having a secondary magnetic circuit secured to the stator and a primary magnetic circuit constrained to rotate with the rotor, the turbomachine further including a detector device for automatically detecting ferromagnetic particles in the oil enclosure, said detector device being powered electrically by electromagnetic induction, wherein the detector device comprises; a pair of electrodes disposed on the inside annular face of the rotor; and a secondary magnetic circuit secured to the rotor, said circuit being excited by the magnetic field created by the secondary magnetic circuit of the electricity generator of the turbomachine so as to apply a voltage between the electrodes.