Patent ID: 7705587

Claim:
A position sensor including an encoder formed by a multipolar magnetic ring having a circumference provided with alternating North poles (N) and South poles (S) and mounted to enable movement past a measurement cell delivering a periodic signal which corresponds to a change in intensity of a magnetic field delivered by the poles, at least one of said poles being defined as an irregular pole (Pi) and having a sign opposite to a sign of poles adjacent thereto (Pa), and having between adjacent poles (Pa) a spacing pitch different from the spacing pitch between other poles of the ring, and including means for correcting magnetic field value so as to stabilize a magnetic signal delivered by the passage of the poles adjacent to said irregular pole, said magnetic signal delivered between the passage of the adjacent poles not passing through a zero value, wherein the correction means comprises at least one saturated magnetic stabilization pole (Ps) having a sign opposite to the sign of the irregular pole (Pi) which is also saturated, each said stabilization pole (Ps) extending from a first edge of the magnetic ring to an opposite edge, while being inserted into the irregular pole, so as to stabilize the magnetic signal delivered by the passage of the poles adjacent to the irregular pole.