Active magnetic bearing with integrated detectors

An active magnetic bearing (1;

• 101) with radial magnetic flux for a rotary machine presenting an axis of rotation OO′, the magnetic bearing (1;
• 101) comprising a stator (2;
• 102) fitted with electromagnet windings (21;
• 121) and with a first stack of ferromagnetic laminations (22;
• 122) extending essentially perpendicularly to the axis OO′, a rotor (3;
• 103) fitted with a second stack of ferromagnetic laminations (9;
• 109) extending essentially perpendicularly to the axis of rotation OO′, servo-control circuits (10;
• 110) for maintaining the rotor (3;
• 103) in equilibrium without contact with the stator (2;
• 102), and at least one detector (6;
• 106) for detecting the radial position of the rotor and at least one detector (4, 5;
• 104, 105) for detecting the axial position of the rotor, which radial and axial position detectors deliver signals to said servo-control circuits (10;
• 110), and the currents carried by the electromagnets (21;
• 121) of the stator (2;
• 102) are servo-controlled on the basis of said currents;
• the bearing being characterized in that the first stack of ferromagnetic laminations (22;
• 122) of the stator (2;
• 102) comprises in succession in the axial direction:
• at least a first sub-set (2a) of laminations (22a) presenting first notches (70) housing electromagnet windings (21;
• 121) of the stator (2;
• 102);
• a second sub-set (2b) of laminations (22b) presenting both first notches (60) housing electromagnet windings (21;
• 121) of the stator (2;
• 102) and second notches housing a radial detector (6;
• 106);
• and a third sub-set (2a) of laminations (22a) presenting first notches (70) housing electromagnet windings (21;
• 121) of the stator (2;
• 102);
• and in that the first stack of ferromagnetic laminations (22;
• 122) of the stator (2;
• 102) further comprises, at its ends, fourth and fifth sub-sets (2c) of laminations (22c) presenting the same notches as each other and housing respective first and second axial detectors (4, 5;
• 104, 105).