Patent ID: 6849979

Claim:
An active magnetic bearing with radial magnetic flux for a rotary machine presenting an axis of rotation OO′,the magnetic bearing comprising a stator fitted with electromagnet windings and with a first stack of ferromagnetic laminations extending essentially perpendicularly to the axis OO′, a rotor fitted with a second stack of ferromagnetic laminations extending essentially perpendicularly to the axis of rotation OO′, servo-control circuits for maintaining the rotor in equilibrium without contact with the stator, and at least one detector for detecting the radial position of the rotor and at least one detector for detecting the axial position of the rotor, which radial and axial position detectors deliver signals to said servo-control circuits, and the currents carried by the electromagnets of the stator are servo-controlled on the basis of said currents; wherein the first stack of ferromagnetic laminations of the stator comprises in succession in the axial direction: at least a first sub-set of laminations presenting first notches housing electromagnet windings of the stator; a second sub-set of laminations presenting both first notches housing electromagnet windings of the stator and second notches housing a radial detector; and a third sub-set of laminations presenting first notches housing electromagnet windings of the stator; and in that the first stack of ferromagnetic laminations of the stator further comprises, at its ends, fourth and fifth sub-sets of laminations presenting the same notches as each other and housing respective first and second axial detectors.