摘要 |
A device for detecting the axial position of a rotary shaft (10) of a rotary machine, the device comprising a target (12) of ferromagnetic material placed at the end of the rotary shaft, an induction coil (31) associated with a stationary magnetic circuit (32) secured to a structure of the rotary machine and placed facing the target while leaving an airgap (60), and a power supply circuit for powering the induction coil, in which device the power supply circuit comprises an AC voltage source (1) connected between a first end (7) of the induction coil and a zone (6) situated at a reference voltage (0 V), at least one capacitor (2) connected between said first end of the induction coil and a second end (8) of the induction coil, and a detector device (4) interposed between the second end and the zone situated at the reference voltage (0 V), in order to deliver on a line (5) information (i L) about the magnitude of the current flowing between said second end and said zone situated at the reference voltage (0 V), the information (i L) representing the value of a modification x to the width of the airgap that presents a predetermined nominal value e0. |