Magnetic bearing and rotary machine comprising such a bearing

A rotary machine, comprising:

• a rotor including an armature;
• and
• a bearing comprising:
• a stator magnetic circuit secured to a stationary support device, the stator magnetic circuit comprising at least one coil and a ferromagnetic body placed in a protective annular support, the protective annular support leaving uncovered a surface of the ferromagnetic body and a surface of the at least one coil;
• and
• at least one annular plug disposed within the ferromagnetic body, the at least one annular plug covering the uncovered surface of the at least one coil;
• wherein the at least one annular plug and the surface of the ferromagnetic body are re-machined to obtain a flat surface,
• wherein the annular plug and the surface of the ferromagnetic body which are left uncovered by the protective annular support and the protective annular support are covered by a protective coating, and
• wherein the flat surface of the ferromagnetic body and the annular plug covered by the protective coating are uncovered and facing the armature of the rotor.

A method for manufacturing a bearing comprising a stator magnetic circuit secured to a stationary support device, the stator magnetic circuit comprising at least one coil and a ferromagnetic body placed in a protective annular support, the protective annular support leaving uncovered a surface of the ferromagnetic body and a surface of the at least one coil, the method comprising:

• a) welding at least one annular plug to the at least one coil and/or to the ferromagnetic body;
• b) re-machining the at least one annular plug and the surface of the ferromagnetic body which is left uncovered by the protective annular support to obtain a flat surface;
• and
• c) coating the at least one annular plug, the protective annular support, and the surface of the ferromagnetic body which is left uncovered by the protective annular support with a protective layer.