Method and device for conditioning a measurement signal

A device for conditioning a measurement signal supplied by an inductive position sensor for a rotor of an electric machine supported by at least one active magnetic bearing, the inductive position sensor measuring a displacement of the rotor and being supplied by an alternating voltage source supplying a sinusoidal supply voltage at a predetermined constant period, the device comprising:

• a sampler configured to sample the measurement signal at a first sampling time to determine a first sample of the measurement signal and to sample the measurement signal at a second sampling time to determine a second sample of the measurement signal, the second sampling time being separated from the first sampling time by a quarter of the predetermined constant period of the supply voltage and sinusoidal, and
• first means configured to break down the measurement signal into a sum of a sine function and a cosine function from the first and second samples of the measurement signal, and a predetermined phase shift between the phase of the sinusoidal supply voltage and the phase of a sampling signal associated with the first and second sampling times.